U.S. patent number 3,554,428 [Application Number 04/802,885] was granted by the patent office on 1971-01-12 for magazine assembly for a fastener-driving device.
This patent grant is currently assigned to Textron Inc.. Invention is credited to George M. Smith.
United States Patent |
3,554,428 |
Smith |
January 12, 1971 |
MAGAZINE ASSEMBLY FOR A FASTENER-DRIVING DEVICE
Abstract
A magazine assembly for a corrugated fastener-driving device is
described in which the magazine includes an elongated member having
a U-shaped cross section. Longitudinal grooves opening inwardly of
the U-shaped member are placed in the outermost ends of the legs of
the U-shaped member forming opposed pairs of longitudinal grooves
progressively more distant from the base of said U-shaped member.
An elongated cover means of substantially inverted U-shaped cross
section is provided to cover the U-shaped magazine. The cover means
has out-turned flanges adapted to be received by the
above-mentioned grooves so that the magazine may be opened and
closed by sliding the cover within the grooves. The distance of the
cover from the base of the U-shaped magazine may be adjusted by
placing the cover in different pairs of grooves. A pusher assembly
for yieldably urging the fasteners toward the driving means is
mounted on the cover and entirely contained thereon. The pusher
which engages with the fasteners rides in a longitudinal slot in
the bight of the U-shaped cover. The longitudinal slot opens at the
rear end of the cover and extends forwardly toward the driving
element. A tension spring having one end anchored to the pusher
extends forwardly around a pulley at the forward end of the cover
and then rearwardly to be anchored at the rear end of the cover.
Proper spacing of the pusher from the cover in order that the
pusher will engage with the fasteners in the magazine is obtained
by spaced studlike members extending from the pusher to engage with
the longitudinal slot in the cover. A detent means, which is either
vertically acting or side acting, mounted in the U-shaped magazine
member cooperates with the cover to secure the cover in the
fully-closed position. The detent means may be released to a first
position permitting the cover to slide rearward away from the
driving element to a fastener loading position. At this point, the
detent means, in said first release position, cooperates with the
cover to limit the rearward movement of the cover from the fastener
loading position. The detent means may be released further,
allowing the cover to slide rearward from the fastener loading
position, permitting the cover to be removed from the U-shaped
magazine member so that it may be placed in a different pair of
grooves in the U-shaped magazine member thereby adjusting the
magazine assembly for a different fastener height. The preferred
embodiment of the magazine assembly constructed according the
principles of this invention is adapted for use in fastener-driving
devices for corrugated fasteners of the type which positions the
leading fastener to be engaged by the driving element and
subsequently cammed into alignment with the driver element and
driven into the workpiece. Thus, a wear plate and blade guide are
provided and adapt the drive track to cooperate with the magazine
assembly to perform this function.
Inventors: |
Smith; George M. (Pawcatuck,
CT) |
Assignee: |
Textron Inc. (Providence,
RI)
|
Family
ID: |
25184991 |
Appl.
No.: |
04/802,885 |
Filed: |
February 27, 1969 |
Current U.S.
Class: |
227/109; 227/127;
227/139 |
Current CPC
Class: |
B25C
1/006 (20130101) |
Current International
Class: |
B25C
1/00 (20060101); B25c 005/06 () |
Field of
Search: |
;227/109,120,127,139 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Custer, Jr.; Granville Y.
Claims
I claim:
1. A device for driving successive fasteners from a corrugated
fastener stick of the type including a plurality of individual
corrugated fasteners each having flat portions at the ends thereof
providing opposed surfaces of relatively narrow width positioned
centrally with respect to the corrugation thickness thereof, which
individual fasteners are secured together in row formation with
their corrugations similarly oriented in abutting nested relation,
said device comprising:
a vertically extending nosepiece;
a generally laterally extending magazine assembly fixed with
respect to said nosepiece;
said magazine assembly including structure defining a corrugated
fastener stick receiving guideway and means for biasing a
corrugated fastener stick in said guideway toward one end
thereof;
the structure defining said guideway including fastener stick
bottom-supporting surface means disposed in a generally horizontal
plane and opposed fastener stick side guide surfaces means disposed
in generally parallel vertical planes;
said nosepiece having a vertical slot formed in the rearward
surface thereof of rectangular cross-sectional configuration having
a width slightly greater than the thickness of a corrugated
fastener and a length substantially equal to the width of a
corrugated fastener less the flat end portions thereof;
said slot including an intermediate portion vertically coextensive
with the one end of said guideway and communicating therewith, the
rearward surfaces of said nosepiece laterally adjacent said slot
within the upper extent of said intermediate slot portion
presenting stop surfaces at the one end of said guideway for
engaging the leading flat end surfaces of the leading corrugated
fastener of a stick biased within said guideway so as to retain the
leading fastener in a feeding position wherein the forward portion
of the fastener is disposed partially within the intermediate
portion of said slot;
said nosepiece having a groove of a size to receive a flat end
portion of a corrugated fastener formed therein in communication
with each side of said slot from a position adjacent the lower
extent of said intermediate portion to the lower extremity of said
slot;
said magazine assembly including a portion closing the lower
rearward portion of said slot, said portion including cam surfaces
extending downwardly and forwardly from a position within said
guideway relieving the bottom support of the fastener disposed in
said feeding position while retaining the bottom support of the
corrugated fastener nested therein; and
a driver blade of a size to engage within said slot mounted therein
for vertical reciprocating movement through an upward stroke during
which the leading corrugated fastener of a stick disposed within
said guideway is biased into said feeding position and downwardly
through a drive stroke during which the fastener in said feeding
position is engaged by said driver blade and moved downwardly
therewith so as to be stripped from said stick, then moved
forwardly by said cam surfaces wholly into said slot and said
grooves in alignment beneath said driver blade and driven into the
workpiece.
2. The device for driving fasteners defined in claim 1 wherein said
portion closing the lower rearward portion of said slot is a plate
including means defining an opening therein of a size to allow said
corrugated fasteners to pass therethrough, said opening being
positioned as to communicate with said intermediate portion of said
slot and said one end of said guideway, and means defining cammed
surfaces extending downwardly and forwardly from a lower edge of
said opening for relieving the bottom support of said fastener
disposed in said feeding position.
3. The device for driving fasteners defined in claim 2 having means
defining a plurality of corresponding axially aligned holes in each
of said nosepiece, said one end of said guideway and said plate
means for allowing a like number of bolts to pass therethrough to
secure said nosepiece, said guideway and said plate means
together.
4. The device for driving fasteners defined in claim 1 wherein said
magazine assembly includes:
means defining a plurality of vertically spaced inwardly facing
horizontally extending grooves formed in said guide surfaces in
positions to define a plurality of opposed pairs of cooperating
horizontally spaced grooves;
a cover member including side portions of a size to engage within
any selected one of said pairs of opposed grooves to accommodate
the particular height of fastener stick to be received within said
guideway, said cover member when engaged in any selected one of
said pairs of opposed grooves being mounted for sliding movement
within said pair of grooves from an operative position generally
enclosing said guideway into a loading position generally exposing
said guideway; and
means acting between said magazine and cover members operable to
(1) retain said cover member in said operative position when
selectively engaged in any of said opposed pairs of grooves, (2)
release said cover member from said operative position when
selectively engaged in any of said opposed pairs of grooves to
permit movement of the cover member away from said operative
position toward said loading position, (3) limit the movement of
said cover member away from said operative position to said loading
position, and (4) release said cover member from said loading
position when selectively engaged in any one of said opposed pairs
of grooves to permit outward separation of said cover member from
said selected one pair of said grooves and engagement of said cover
member into another pair of said grooves.
5. A magazine assembly for receiving fastener sticks of varying
heights of the type which may be bottom supported secured together
in row formation and for feeding the leading fastener of the stick
to a drive track to be driven by a fastener-driving element, said
magazine assembly comprising:
an elongated magazine member defining a longitudinally extending
guideway for receiving a fastener stick of the type described, said
member having means defining a fastener stick bottom support and
sidewalls extending upwardly on opposed sides thereof, each of said
sidewalls having a plurality of vertically spaced inwardly facing
horizontally extending grooves formed therein in positions to
define a plurality of opposed pairs of cooperating horizontally
spaced grooves;
a cover member including side portions of a size to engage within
any selected one of said pairs of opposed grooves to accommodate
the particular height of fastener stick to be received within the
guideway, said cover member when engaged in any selected one of
said pairs of opposed grooves being mounted for sliding movement
within said pair of grooves from an operative position generally
enclosing said guideway into a loading position generally exposing
said guideway;
fastener stick pusher means mounted within said magazine assembly
for horizontal sliding movement therein;
spring means carried within said magazine assembly and connected
with said pusher means for resiliently urging the latter in a
direction to engage the trailing end of a fastener stick received
within said guideway and resiliently urge the leading fastener
thereof toward said drive track; and
means acting between said magazine and cover members operable to
(1) retain cover member in said operative position when selectively
engaged in any of said opposed pairs of grooves, (2) release said
cover member from said operative position when selectively engaged
in any of said opposed pairs of grooves to permit movement of the
cover member away from said operative position toward said loading
position, (3) limit the movement of said cover member away from
said operative position to said loading position, and (4) release
said cover member from said loading position when selectively
engaged in any one of said opposed pairs of grooves to permit
outward separation of said cover member from said selected one pair
of grooves and engagement of said cover member into another pair of
said grooves.
6. The magazine assembly of claim 5 in which said cover member is
an inverted elongated U-shaped member having a flange extending
laterally outward from each side thereof with a centrally disposed
longitudinal slot through said cover extending substantially the
length thereof, in which:
said spring means is a tension spring having one end anchored at
the rear end of said cover inwardly of said U-shaped member and
extending forwardly around a pulley journaled on a shaft mounted on
the front end of said cover and then extending rearwardly to be
anchored to said pusher means; and in which
said pusher includes a plurality of longitudinally spaced studs
engaged with said slot in said cover spacing said pusher downward
from said cover to engage with said fasteners.
7. The magazine assembly defined in claim 5 in which said means
acting between said magazine and cover members comprises a first
detent placed in a first side of said guideway for releasably
retaining said cover member in said operative position and a second
detent placed on a second side of said guideway for releasably
retaining said cover member in said fastener-loading position and
means on said cover member adapted on a first side thereof to
cooperate with said first detent and on a second side thereof to
cooperate with said second detent.
8. The magazine assembly defined in claim 7 wherein:
said cover member includes a first edge on a first side thereof and
a second edge on a second side thereof for engaging said cover
member with a selected pair of said opposing grooves, said first
edge having a slot defined therein adapted to engage with said
first detent when said cover is in said operative position, said
second edge having an abutment formed thereon adapted to engage
with said second detent when said cover is in said fastener-loading
position;
said first detent including a plurality of sections axially located
thereon so that one of said sections may be aligned with each of
said longitudinal grooves in said first side of said guideway when
said detent is in a predetermined position, said sections being
adapted to engage with said slot in said first edge releasably
retaining said cover in said operative position, the remainder of
said first detent being of a size as to allow said first edge to
slide freely therepast in said longitudinal grooves after said
first detent has been disengaged from said slot, said first detent
further including resilient biasing means yieldably urging said
first detent to a position aligning said sections with said
horizontal grooves in said first side of said guideway; and
said second detent including a plurality of sections axially
located thereon so that one of said sections may be aligned with
one of said horizontal grooves in said second side of said guideway
when said second detent is in a predetermined position, said
sections being adapted to engage with said abutment on said second
edge releasably retaining said cover in said fastener-loading
position, the remainder of said second detent being of a size as to
allow said second edge to slide freely therepast in said horizontal
grooves removing said cover from said magazine after said detent
has been disengaged from said abutment, said second detent further
including resilient biasing means yieldably urging said second
detent to a position aligning said sections thereon with said
horizontal grooves in said second side of said guideway.
9. The magazine assembly defined in claim 5 wherein said means
acting between said magazine and cover members comprises a single
detent placed in one side of said guideway for releasably retaining
said cover means in said operative position and for releasably
retaining said cover means in said fastener-loading position, said
cover means being adapted on a side thereof adjacent said one side
of said guideway to cooperate with said single detent.
10. The magazine assembly defined in claim 9 wherein said cover
means includes edges extending outwardly therefrom for engagement
with a selected one of said pairs of opposed grooves, the edge
adjacent said first side of said guideway having a slot defined
therein adapted to engage with said detent when said cover is in
said operative position and an abutment thereon adapted to engage
with said detent when said cover is in said fastener-loading
position;
said detent including a plurality of first sections axially located
thereon so that one of said first sections may be aligned with each
of said horizontal grooves in said one side of said guideway when
said detent is in a first position, said first sections being
adapted to engage with said slot in said cover releasably retaining
said cover member in said operative position, said detent means
including a plurality of second sections axially located thereon so
that one of said second sections may be aligned with each of said
horizontal grooves in said one side of said guideway when said
detent is in a second position having been disengaged from said
slot in said cover member, said second sections being adapted to
engage with said abutment when said cover means has been moved to
said fastener-loading position, said detent means including a
plurality of third sections axially located thereon so that one of
said third sections may be aligned with each of said longitudinal
grooves in said one side of said guideway when said detent is in a
third position having been disengaged from said abutment in said
cover means, said third sections being of a size as to allow said
cover means to slide therepast in said grooves to be removed from
said magazine, and said detent means further including a resilient
biasing means adapted to yieldably urge said detent into said first
position.
11. The magazine assembly of claim 9 in which:
said cover member includes edges extending outwardly therefrom for
engagement with a selected one of said pairs of opposed grooves,
the edge adjacent said first side of said guideway having a slot
defined therein adapted to engage with said detent when said cover
is in said operative position, said edge, forwardly of said slot,
tapering inwardly and forwardly of said cover member to a point
where said edge abruptly reverts to a greater width forming an
abutment, said abutment being adapted to engage with said detent
when said cover is in said fastener-loading position; and
said detent comprising a laterally acting latch spring biased
inwardly of said guideway to engage said slot and which, when
pressed laterally out of engagement with said slot, allows said
cover to slide rearwardly, said spring bias being sufficient to
urge said latch inwardly, said latch thereby riding against said
tapered edge until said latch engages with said abutment, said
latch being movable laterally from said engagement with said
abutment to permit said cover to slide farther rearward out said
base member.
12. The magazine assembly defined in claim 5 wherein said pusher
means is mounted on said cover member for horizontal sliding
movement therein and said spring means attached to said pusher is
carried by said cover member.
Description
This invention relates to a magazine assembly in a fastener-driving
device for storing a columnar supply of corrugated fasteners or
fastener stick including means for resiliently urging the fastener
stick toward the path of the driving element so that the driving
element, during its driving stroke, will strip the outermost
fastener from a stick and drive it into a workpiece, and including
a nosepiece means for camming a corrugated fastener from a nested
stick arrangement into alignment with the path of the driving
element.
There are many power-operated fastener-driving devices presently
available on the commercial market having magazine assemblies for
accommodating fasteners such as staples and T-head nails. Fasteners
of this type are conventionally packaged in stick formation. A
conventional fastener stick includes a multiplicity of fasteners
assembled in a coextensive abutting relationship and secured in
such assembled relationship by any suitable means, such as tape,
adhesive or the like. In this way a multiplicity of fasteners are
packaged as a unit which can be easily handled both prior to use in
the fastener-driving device and when necessary to reload the
fastener magazine of the fastener-driving device.
A characteristic of conventional fastener sticks, consisting either
of staples or of T-head nails, is that each fastener is of
substantially uniform thickness and extends transversely across the
stick making it a relatively simple matter to feed the leading
fastener of the stick into the drive track of the fastener-driving
device to be stripped off of the stick during the drive stroke of
the driving element of the fastener-driving device.
Corrugated fasteners have been known for many years, but they
present a peculiar problem in feeding a stick of corrugated
fasteners to the drive track so that the leading fastener can be
properly stripped off and driven, because the corrugations in these
fasteners have a longitudinal component of extension. That is, it
is not practical to provide the driving element with a corrugated
configuration corresponding to that of the leading fastener so that
during the drive stroke the leading fastener may be simply stripped
off, as is the case with staples and T-head nails.
This problem was first solved by assembling the corrugated fastener
stick with alternate fasteners oriented in opposite directions so
that the outer extremities or ribs of each pair of adjacent
fasteners in the stick are disposed in an abutting relationship.
With a fastener stick of this configuration the driver element may
be of a conventional rectangular cross section operating in a
conventional rectangular cross section drive track and operating in
the usual manner to strip the fastener from the stick and drive it
into a workpiece. This fastener stick configuration was found to be
highly disadvantageous, however, because only a minimal number of
fasteners could be included in the stick on a per unit length basis
necessitating frequent reloading.
The density of a corrugated fastener stick can obviously be
increased by nesting the fasteners in abutting relationship with
their corrugations similarly oriented. Indeed, the density can be
improved as much as 100 percent with a stick arrangement of this
type where the corrugations have a 50 percent overlap. However, due
to the overlap, the feeding and driving of a stick of this type
cannot be accomplished by a simple stripping action as is the case
with the alternately oppositely oriented corrugated fastener stick
or the conventional staple or T-head nail stick.
While there have been many proposals advanced to solve the feeding
and driving problems inherently presented in a nested corrugated
fastener stick, one method which has achieved a measure of
commercial acceptance involves the utilization of stop means in the
drive track which serves to engage the outermost corrugation or
corrugations of the leading fastener so as to initially position
the leading fastener so that it extends only partially within the
drive track and the next adjacent fastener is wholly without the
drive track. With this arrangement, during the initial portion of
the downward movement of the fastener driving element, the portion
of the upper surface of the leading fastener extending into the
drive track, is engaged by the fastener driving element and is
moved downwardly therewith to strip it from the remaining fasteners
of the stick. During the initial downward movement of the leading
fastener with the fastener-driving element, the fastener is cammed
into longitudinal alignment with the drive track so that as it
issues from the end of the drive track it will be in proper
alignment beneath the fastener-driving element to be moved thereby
into the workpiece. Examples of this type of arrangement are
disclosed in U.S. Pat. No. 3,301,456 and German Pat. No.
846,161.
While this general arrangement of feeding and driving a nested
corrugated fastener stick has proved satisfactory in operation,
orientation problems may be presented as a result of improper
orientation of the sticks when loading the magazine assembly. While
no solution to this problem is contemplated in the aforesaid German
patent, the aforesaid U.S. patent contemplates solving this problem
by providing a stop surface, which serves to engage and initially
position the leading fastener partially within the drive track,
with a width which is sufficiently larger that the corrugation
pitch to contact at least one rib of the leading corrugated
fastener irrespective of its orientation. To accommodate this
enlarged stop surface an enlarged slot must be cut out of the
fastener driving element which materially reduces the contact area
which the fastener-driving element has with the upper surface of
the corrugated fastener during the driving action and renders the
driving action nonsymmetrical.
In the commonly assigned application Ser. No. 677,224, now U.S.
Pat. No. 3,507,384, filed by Raymond F. Lippitt a solution is
offered to the above discussed orientation problems with respect to
nested corrugated fastener sticks adapted for use in power-operated
fastener-driving devices. The corrugated fasteners constructed
according to the principles of the invention disclosed in the
latter application are provided with relatively narrow,
substantially flat centrally located end portions for cooperating
with spaced relatively narrow stop surfaces positioned adjacent the
ends of the drive track in the fastener-driving device so as to
insure proper initial positioning of the leading fastener partially
within drive track of the device irrespective of the orientation of
the corrugations, thus enabling the fastener-driving element to
have a fastener-contacting surface of maximum full rectangular
dimensions. A more complete description of the fastener constructed
according to the principles of the Lippitt invention is given
hereinbelow.
With the advent of the above described fastener it has become
necessary to provide a fastener-driving device constructed to
provide the desired positioning action which is of simple
construction and easy to assemble. Further, it has become necessary
to provide a magazine assembly which will readily cooperate with
the fastener-driving device constructed to utilize the benefits of
the fastener design disclosed in the aforementioned Lippitt
application.
Within each of the above mentioned type groups of fasteners, not
only corrugated fasteners, a variety of sizes are available, and a
dimension which is varied frequently is the height of the fastener.
It is obviously desirable to be able to accommodate fastener sticks
of the same type of several different heights in a single
fastener-driving device in that the cost of having a number of
fastener-driving devices for accommodating the various fastener
sizes encountered would be prohibitive. Furthermore, it would be
costly and highly inconvenient for an operator to be required to
change magazines or substitute magazine parts each time it is
necessary to use a different fastener size.
It has been suggested previously that the magazine dimensions be
altered to accommodate the specific fasteners being used by moving
the top or bottom surfaces as needed. Generally, that surface is
used which has the pusher mounted thereon, usually the cover,
because that surface is usually already slidable or otherwise
movable for fastener-loading purposes. In most available fastener
magazines, however, the spring which actuates the pusher is
connected to the stationary part of the magazine, and this presents
an obvious problem of having to work against the spring force to
disconnect and reconnect the spring when one is seeking to remove
the cover to place it at a different height.
While there are in existence magazine covers on which the pusher
and actuating spring are entirely self-contained, these covers do
not lend themselves to removal for height adjustment in that pins
or other stop means are used, replacing the spring connection to
the stationary part of the magazine, to keep the cover from
accidentally being removed from the magazine while a fastener stick
is being loaded therein. Therefore, each time it is required that
the cover be removed from the magazine to make a height adjustment,
these magazines will have to be dismantled or parts removed
therefrom to an extent necessary to remove the above described stop
means.
In the corrugated fastener art the problem of accommodating
fastener height variation in the magazine becomes more difficult
because of the peculiar problems surrounding stripping this
particular type of fastener from a fastener stick and driving it
into a workpiece as discussed above. In the fastener-driving
devices constructed according to the principles of this invention a
stop means is utilized on the sides of the drive track for engaging
the centralized end portions of the leading fastener so as to
initially position the leading fastener so that it extends only
partially within the drive track and the next adjacent fastener is
wholly outside the drive track. With this arrangement, during the
initial portion of the downward movement of the fastener-driving
element, the portion of the upper surface of the leading fastener
extending into the drive track is engaged by the fastener-driving
element and is moved downwardly therewith to strip it from the
remaining fasteners on the stick. During the initial downward
movement of the leading fastener with the fastener-driving element,
the fastener is cammed into longitudinal alignment with the drive
track so that as it issues from the end of the drive track it will
be in proper alignment beneath the fastener-driving element to be
driven by it into the workpiece.
In the fastener-driving devices so constructed the portion of the
rear surface of the drive track, the wear plate, extending
downwardly from the opening of the magazine into the drive track
must be inclined outwardly and downwardly from the magazine floor
until it coincides with the path of the driving element. Further,
the blade guide, or that portion of the drive track opposite the
magazine opening into the drive track must have a projection or
plurality of projections extending into the path of the driver
element so that the leading fastener will be stopped when it is
partially within the drive track. These projections must
approximately coincide with the upper portion of the fasteners.
Cammed surfaces must be provided extending downwardly from the
outermost edges of the projections until the blade guide surface
again coincides with the path of the driving element thereby
providing relief for the working surface of the corrugated fastener
allowing it to be cammed into longitudinal alignment with the drive
track.
It is fundamentally important that the upper edge of the portion of
the wear plate extending downwardly and forwardly from opening of
the magazine into the drive track in fact coincides with the
magazine floor if the fasteners are to be allowed to move smoothly
out of the magazine and the camming operation described above is to
properly take place. Therefore, if different fastener heights are
to be accommodated, it would be undesirable to move the portion of
the fastener magazine supporting the bottom working surfaces of the
fasteners either up or down, because a wear plate of a different
size would then have to be provided also. It can, therefore, be
seen that in order to vary the height of the magazine used in
fastener-driving devices of this type, the height variation must be
accomplished by changing the position of the cover relative to the
position of the magazine floor. Again, it is desirable that the
spring actuated pusher means engaging the fastener stick and urging
it forwardly be entirely self-contained on the cover so that the
cover may be readily removed from the magazine to be placed in a
different position. Moreover, a suitable detent means must be
provided which will stop the cover in the fastener-loading
position, which means is releasable to allow the cover to be
removed from the magazine.
It is therefore an object of this invention to provide a magazine
assembly and cooperating nose assembly for a fastener-driving
device which is of simple construction and easy to assemble and is
adapted to cooperate with a nested corrugated fastener stick having
a plurality of individual corrugated fasteners having flat portions
at the ends thereof providing opposed surfaces of a relatively
narrow width positioned centrally with respect to the corrugation
thickness thereof for positioning the lead fastener on said stick
partially within the drive track and to allow it to be stripped
therefrom and cammed into longitudinal alignment with the drive
track by the driving element.
It is another object of this invention to provide a magazine
assembly for a fastener-driving device, including a spring-actuated
pusher means for yieldably urging the fastener stick toward the
drive track of the fastener-driving device permitting the driving
element to strip the leading fastener from the fastener stick and
drive it into a workpiece, capable of storing fastener sticks of
different heights in which the pusher means and its actuating
spring are entirely self-contained on the cover making the cover
easily removable from the remainder of the magazine assembly for
adjustment of its height from the base of the magazine, and in
which a means is provided for retaining the cover in the fully
closed or operative position and in the fastener-loading position,
the means being easily releasable allowing the cover to be readily
removed from the magazine.
A further object of this invention is to provide a magazine
assembly for a corrugated fastener-driving device of the type
having a wear plate and blade guide adapted to cam a corrugated
fastener having flat portions at the ends thereof providing opposed
surfaces of relatively narrow width positioned centrally with
respect to the corrugation thickness thereof extending partially
into the drive track into full alignment with driving element in
which the magazine assembly meets the object immediately above and
in which the magazine assembly is easily adjustable to accommodate
fasteners of different heights without disturbing the relationship
of the magazine surface supporting the fasteners to the wear
plate.
Still another object of this invention is to provide a magazine
assembly for a fastener-driving device a detent-type locking
mechanism having a detent means cooperating with stop means in the
magazine cover for securing the cover in a fully closed or
operative position, the locking mechanism being easily releasable
to allow the cover to be moved from its operative position to a
fastener-loading position, but limiting the rearward movement of
the cover from the fastener-loading position, and then being
further releasable allowing the cover to be removed from the
magazine assembly to be replaced therein at a different height.
The aforementioned and other objects may be obtained by adhering to
the principles of this invention as defined in this specification
and claims hereinbelow.
The invention may be best understood by referring to the
description of a preferred embodiment given below and accompanying
drawings in which:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevational view of a corrugated fastener with
which the nose piece constructed according to the principles of
this invention is constructed to cooperate;
FIG. 2 is an end view of the corrugated fastener shown in FIG.
1;
FIG. 3 is a view looking down on the corrugated fastener of FIG. 1
showing the outline of the upper striking surface thereof;
FIG. 4 is a view looking up on the corrugated fastener shown in
FIG. 1 showing the outline of the lower, sharpened workpiece
entering surface thereof;
FIG. 5 is a top cross-sectional view of a nosepiece for a
fastener-driving device constructed in accordance with the
principles of this invention having a partially depleted corrugated
fastener stick therein, and a full corrugated fastener stick loaded
in oppositely oriented condition within the magazine assembly
constructed according to the principles of this invention and
adapted to cooperate with said nosepiece;
FIGS. 6, 7 and 8 are fragmentary vertical sectional views of the
structure depicted in FIG. 5 showing the manner in which the
leading corrugated fastener is first stripped from the remainder of
the fasteners on the stick, second, cammed into full alignment with
the drive track and third, driven into the workpiece during the
drive stroke of the fastener driving element of the
fastener-driving device;
FIG. 9 is a rear elevational view of the blade guide having the
drive track formed therein;
FIG. 10 is a cross-sectional view of FIG. 9 taken along the line
10-10;
FIG. 11 is a front elevational view of the wear plate forming a
part of the nose assembly;
FIG. 12 is a cross-sectional view of FIG. 11 taken along the line
12-12;
FIG. 13 is a side elevation cross-sectional view of a preferred
embodiment of the magazine assembly and nosepiece constructed
according to the principles of this invention with a fragmentary
view of a fastener-driving device to which said magazine assembly
and nosepiece are attached;
FIG. 14 is a top view of the preferred embodiment illustrated in
FIG. 13;
FIG. 15 is a fragmentary end cross-sectional view of the magazine
assembly depicted in FIG. 13;
FIG. 16 is a top view, partially broken away, of a magazine
assembly including a first alternate embodiment of a detent means
constructed according to the principles of this invention;
FIG. 17 is an end cross-sectional view of the FIG. 16 magazine
depicting the structural details of the first alternate embodiment
of the detent means;
FIG. 18 is a top view of a magazine assembly including a second
alternate embodiment of a detent means constructed according to the
principles of this invention; and
FIG. 19 is an end cross-sectional view of the FIG. 18 magazine
illustrating the structural details of the second alternate
embodiment of the detent means.
DETAILED DESCRIPTION OF THE DRAWINGS
FIGS. 1 through 4 illustrate examples of the corrugated fastener
with which the nosepiece and magazine assembly constituting one
aspect of this invention are designed to cooperate. It is to be
noted that the structural details of the corrugated fastener are
included herein for purposes of clarifying the description of the
invention, and these details of the fastener constitute no part of
the invention disclosed herein.
A corrugated fastener 10 is made of a strip of metal, preferably
steel or the like, having an upper striking en edge or surface 12,
a lower sharpened work-penetrating edge or surface 14 and opposed
end edges or surfaces 16 and 18 formed in the central portion of
the strip. Extending between the upper and lower edges 12 and 14 is
a central rib or corrugation 20 tapered outwardly in a direction
from the upper edge to the lower edge. The portions of the strip
adjacent the central corrugation 20 are formed into a plurality of
ribs or corrugations 22, the corrugations 22 being inclined in a
direction parallel to the taper of the central rib or corrugation
and providing the main portion of the strip with corrugations which
are essentially sinusoidal in cross-sectional configuration.
An essential feature of the construction of the corrugated fastener
is the provision of relatively narrow, flat, centrally located end
portions or sections 28. As best shown in FIGS. 3 and 4, each end
portion includes opposed parallel planar stop-engaging surfaces 30
which are disposed in parallel planes, indicated at 32 and 34,
disposed centrally between the planes 24 and 26 so that the plane
32 is spaced from the plane 24 a distance the same as the plane 34
is spaced from the plane 26.
A multiplicity of corrugated fasteners are assembled in a
coextensive row formation with their corrugations oriented in the
same direction so that the corrugations of adjacent fasteners in
the row formation are nested with respect to each other as shown in
FIGS. 5 through 8. In accordance with the present invention, a
plurality of fasteners assembled as aforesaid are secured in
assembled relation to form a stick by any conventional means as,
for example, an adhesive or the like.
High density in the fastener stick construction is desirable when
the stick is used for its intended purpose in conjunction with
power-operated fastener-driving devices since it minimizes the
downtime in operation necessary to effect reloading. However, the
advantages of the above described corrugated fastener stick
construction can be realized only if a fastener-driving device may
be constructed which is capable of stripping the fasteners from the
stick one at a time in order to drive them into a workpiece. Thus,
the advantages of the above corrugated fastener stick construction
flow primarily from the manner in which the corrugated fasteners
cooperate with the fastener-driving device during operation. The
camming principle, discussed above, is presently the best means
known for allowing fasteners to be stripped from a nested stick and
driven. Heretofore, however, fastener-driving devices utilizing
this principle have been of relatively complex construction,
thereby difficult to manufacture and maintain. The nosepiece and
cooperating magazine assembly construction described hereinbelow in
FIGS. 5 through 12, substantially alleviate this problem by
allowing a fastener-driving device using the camming technique to
be constructed which is of simple manufacture and may be assembled
with relatively few steps. Further, the fastener driving operation
resulting from a fastener-driving device constructed according to
the principles of this invention will be more efficient because a
more symmetrical driving force will be realized.
The portion of the fastener-driving device shown in FIGS. 5 through
8 includes a magazine 36 of a size to receive therein a fastener
stick made of the fasteners discussed above with respect to FIGS. 1
through 4. A spring-biased pusher 38 is provided which effects a
longitudinal feeding movement of the fastener stick within the
magazine 36 toward the discharge end thereof which communicates
with an opening 40 formed in a wear plate 42. The details of the
construction and operation of the magazine will be discussed more
fully hereinbelow with reference to FIGS. 11 through 17. The
opening 40 enters into a drive track 44 which is formed by a groove
in a blade guide 46 and adjacent surface of the wear plate 42. A
fastener-driving element 48 of rectangular cross-sectional
configuration is mounted within the drive track 44 for vertical
reciprocation through a drive stroke and a return stroke by any
conventional power-operated mechanism as, for example, the
mechanism disclosed in commonly assigned U.S. Pat. No.
3,051,135.
As best shown in FIG. 5, the width of the drive track 44 provided
by the groove in blade guide 46 is slightly less than the width of
the opening 40 and the interior dimension of the magazine 36 so as
to provide narrow vertically extending stop surfaces 50 at the
sides of the magazine outlet. The width of these stop surfaces is
slightly less that than the minimum width of the centralized flat
end portions 28 of the corrugated fasteners.
With reference to FIG. 5 it will be noted that the pusher 38 serves
to resiliently urge the leading corrugated fastener of the stick
within the magazine toward drive track 44 and that stop surfaces 50
serve to position the leading fastener partially within the drive
track and the next adjacent fastener and the stick wholly without
the drive track. The leading fastener is thus presented in a
position partially extending into the drive track so that a portion
of its upper striking surface 12 will be engaged by the lower
surface of the fastener-driving element during its downward drive
stroke. The engagement of the fastener-driving element with
striking surface of the leading fastener serves to move it
downwardly and hence strip it from the remaining corrugated
fasteners forming the stick. The wear plate 42 and blade guide 46
are formed so as to cam the leading fastener fully into the drive
track in alignment with the fastener-driving element during the
initial portion of its downward movement with the fastener-driving
element 48.
This camming function is obtained in the embodiment shown by
forming a slot in the leading surface of the wear plate 42 below
and in communication with the opening 40 so as to provide an
inclined cam surface 52 having a width substantially equal to the
width of the drive track 44 and a pair of a narrow parallel
inclined surfaces 54 at each end thereof having a width generally
equal to the width of the associated stop surface 50. This wear
plate construction is best shown in FIGS. 11 and 12. In addition,
the blade guide 46, as best shown in FIGS. 6 through 10, is formed
with parallel grooves 56 extending inwardly and downwardly from a
position spaced above the lower surface of the opening 40 and then
vertically downwardly to lower end of the blade guide adjacent each
side of the drive track 44. Each groove 56 has width generally
equal to the width of the associated stop surface 50 and a depth
slightly greater than the distance between the planes 32 and 26 of
the corrugated fasteners.
In order to understand how the construction of the blade guide and
wear plate cooperate with the construction of the corrugated
fastener described above in order to operate according to the
camming principle, reference is now made to FIGS. 6 through 8. The
engagement of the centralized flat end portions 28 with the stop
surfaces 50 serves to position the leading corrugated fastener of
the stick within the magazine 36 so that a portion of the striking
surface 12 thereof extends into the drive track 44 to be engaged by
the lower end of the fastener-driving element as it descends during
its drive stroke. The relief provided by the inclined surfaces 52
and 54 is such that the work penetrating surface 14 of the leading
fastener is unsupported. It will be noted, however, that the relief
provided by the inclined surfaces 52 and 54 is such that support is
provided for the work penetrating surface 14 of the next adjacent
fastener, at least at the end portions thereof. Thus, as shown in
FIG. 6, when the lower edge of the fastener-driving element 48
engages the portion of the striking surface 12 extending into the
drive track, the leading corrugated fastener 10 of the stick will
be moved downwardly with respect to the remaining corrugated
fasteners and thus stripped from the stick. As the leading
corrugated fastener moves downwardly with the fastener-driving
element, the inclined surfaces 52 and 54 are engaged by the leading
corrugated fastener to effect a tilting forward movement thereof
into a position of alignment with drive track 44 and the
fastener-driving element 48. As shown in FIG. 7, the relief
provided by the grooves 56 permits entry of end portions 28 into
the drive track during this camming motion. As shown in FIG. 8, the
leading corrugated fastener 10 is fully aligned with the drive
track 44 and the fastener-driving element 48 as the fastener is
moved outwardly of the drive track and into the workpiece during
the final portion of the drive stroke of the fastener-driving
element.
A more detailed illustration of the structural details of blade
guide is shown in FIGS. 9 and 10. The blade guide is formed from a
metal plate of rectangular cross section in which a longitudinal
groove has been centrally disposed therein to form drive track 44.
In order to provide the narrow vertically extending stop surfaces
50, the groove in blade guide 46 is slightly less than the width of
the opening 40 and the interior dimensions of magazine 36. The
width of the stop surfaces is slightly less than the centralized
flat end portions 28 of the corrugated fasteners described above.
The blade guide is provided with parallel grooves 56 on each side
of the drive track curving inwardly from the lower edges of the
stop surfaces 50 and then downwardly to lower end of the blade
guide. Each of the grooves 56 is of a width approximately equal to
the width of the associated stop surface 50 and a depth slightly
greater than the distance between the planes 32 and 26 of the
corrugated fasteners. Four holes 58 are provided on the blade guide
46 corresponding to the positions of four similar holes on the wear
plate 42, the forward end of the magazine 36 and the nosepiece 114.
These holes are for simultaneously bolting these elements together
to form the drive track assembly of the fastener-driving
device.
In FIGS. 11 and 12 the structural details of the wear plate are
shown. The wear plate is a flat metal plate having centrally formed
therein an opening 40 through which fasteners may move from the
magazine to the drive track. As discussed above, an inclined
surface 52 extends downwardly and forwardly from the lower edge of
opening 40 until that surface becomes flush with the surface of the
wear plate at the lower portion thereof. On each side of inclined
surface 52 are formed parallel inclined surfaces 54 each of which
has a width approximately equal to the width of the stop surfaces
50 on the blade guide. As was the case with blade guide 46, four
screw holes 58 are provided on wear plate 42 which correspond to
similar holes on the blade guide, the magazine assembly and the
nosepiece. Thus, the drive track 44 may be formed by placing the
rear surface of blade guide 46 adjacent the forward surface of wear
plate 42 and attaching these elements and the magazine assembly 36
to the nosepiece 114 of the fastener-driving device by means of the
four screws or bolts. It can be seen, therefore, that when a drive
track and magazine assembly is constructed according to the
principles of this invention, the results will be a
fastener-driving device that is easy to manufacture and
assemble.
FIGS. 13 through 19 illustrate preferred embodiments of a magazine
assembly constructed according to the principles of this invention.
While preferred embodiments disclosed are shown as operating to
drive corrugated fasteners of the type described above, it will be
appreciated that the principles of this invention with respect to
the adjustable characteristic of the magazine assembly may be
applied to any magazine designed to accommodate a fastener stick
which can be supported on its bottom surfaces. Furthermore, the
locking mechanism for the magazine cover constructed according to
the principles of this invention may well be utilized with any type
of fastener magazine assembly.
As shown FIG. 13, the magazine assembly 36 is attached directly to
the blade guide 46, wear plate 42 and the nosepiece 114 in the
manner described above. The magazine opens directly into drive
track 44 and the fastener stripping and driving operation takes
place as was described hereinabove.
The fastener-driving device described in conjunction with the
preferred embodiment of the magazine assembly constructed according
to the principles of this invention is shown as operating to drive
a fastener vertically downward into a horizontal workpiece with the
magazine being mounted transversely to the drive track of the
fastener-driving device. Thus, the terms indicating direction, such
as "upwardly," "downwardly," "forwardly," or "rearwardly" are with
reference to this configuration. It will be appreciated that other
structural configurations and operating positions may be used
within the principles of the invention defined hereinbelow, making
directional terms such as those used herein only relative.
Referring to FIGS. 13 through 15 magazine assembly 36 includes a
magazine or fastener guideway 132 which is an elongated U-shaped
casting, preferably, but not limited to, aluminum, with the upright
legs 136 and 137 thereof defining a longitudinally extending
guideway flared upwardly and downwardly at the forward end of the
magazine which attaches to nosepiece 114, blade guide 46 and wear
plate 42 of fastener-driving device 100. The flared portions of
legs 136 and 137 contain holes 33 in the upper and lower ends
thereof to receive screws or bolts for attaching the guideway 132
to the nose portion of the fastener-driving device. The forward end
of guideway 132, which is open, communicates with opening 40 in
wear plate 42 permitting fasteners to be introduced into drive
track 44 when the magazine assembly is attached to the
fastener-driving device. When guideway 132 is attached to nosepiece
114, the magazine floor 134, which is the base of the U-shaped
member, exactly coincides with the lower edge 127 of the opening 40
in wear plate 42 which is also the upper edge of inclined surfaces
52 and 54. The magazine further includes, near its rearward end,
vertical holes 131 and 135 in the legs 136 and 137, respectively,
for receiving detent mechanisms generally indicated as 150 and 152,
respectively. In the upper end of each of the legs, longitudinal
grooves 138 opening inwardly of the U-shaped member are formed. The
grooves 138 in each leg are directly opposite grooves in the other
leg so that each horizontally opposed pair may slidably receive a
member such as a cover means 140, to be described below. In the
preferred embodiment, two grooves are placed in a vertical stacked
relationship in each leg, thereby allowing magazine assembly 36 to
accommodate two different fastener heights, but it will be
appreciated that any number may be used to accomplish the desired
height variation.
A cover means, identified generally as 140, is formed by a
generally inverted U-shaped elongated member 142 having out-turned
flanges 143 and 144 which are adapted to be received by an opposed
pair of grooves 138 in the guide way 132. The bight portion of the
U-shaped member 142 extends rearwardly beyond the inverted U-shaped
member and is turned upwardly to form a handle 148 by which the
cover may be grasped to be moved rearwardly of the magazine. An
elongated slot 146, centrally disposed on the bight of the inverted
U-shaped cover means and open at the rear end thereof, extends
inwardly substantially the length of the cover means.
A pusher 38, which is also of a substantially inverted U-shape is
provided for yieldably urging fasteners through opening 40. On the
bight of pusher 38, two studlike members 156 are attached for
slidably mounting the pusher in slot 146. These studlike members
are of a length so as to perform the additional function of
properly spacing pusher 38 from the cover in order to properly
engage with the rear end of fastener stick S. A tension spring 158
is provided having one end anchored to a tab 155 in the interior of
the cover 140 and adjacent the rear end thereof. The spring 158
extends forwardly around a pulley 60 journaled on a vertical shaft
61 mounted on the forward end of the cover and then extends
rearwardly having its other end anchored to a tab 157 extending
upwardly from pusher 38. Thus, tension spring 158 serves to
resiliently urge pusher 38 forwardly towards opening 40.
Cover means 140 also includes an arcuate slot 145 in flange 144
which engages with detent means 152 when cover means 140 fully
closes the magazine. Flange 143 is flared outwardly at the forward
end thereof to form an abutment 147 which engages with detent means
150 when the cover has been moved rearwardly to a position
permitting fasteners to be placed in guideway 132.
Detent means 150 and 152 are each cylindrical pins having wider
diameter sections 250 and 252, respectively, and relatively
narrower diameter sections 350 and 352, respectively. The number of
each of the wider and narrower diameter sections on each detent
corresponds to the number of grooves in each leg of guideway 132,
and each groove communicates with the detent means on its side of
the magazine. Each detent is mounted on one of the vertically
compressed coil springs 62 placed in each of the holes 131 and 135
thereby biasing detent means 150 and 152 upwardly.
The axial location of wide sections 252 on detent 152 is such that
when the detent is extended fully upwardly by spring 62, the wide
sections 252 will be adjacent grooves 138 in leg 137 of guideway
132. With cover 140 in its operative position or fully closing
magazine 132, one of the wide diameter sections 252 will engage
with arcuate slot 145 in the cover regardless of in which of the
opposed pairs of grooves 138 the cover is placed. Thus, by this
means the cover 140 is secured in a position fully closing magazine
132. When detent 152 is manually depressed against the force of
spring 62, the section 252 in engagement with slot 145 is
disengaged therefrom.
The axial location of narrow sections 352 is such that when detent
152 is depressed, these sections will be adjacent grooves 138 in
leg 137. Sections 352 are of a width which will permit flange 144
to pass by detent 152 as cover 140 is moved rearwardly in one of
the opposed pairs of grooves 138. It will be noted that as cover
140 is moved rearwardly, flange 144 will exert a downward force on
the wide section 252 which had held the cover fully closed, holding
detent 152 in the depressed position.
The wide diameter sections 250 on detent 150 are axially located
thereon and of a width as to engage with abutment 147 on cover 140
when detent 150 is extended fully upwardly by spring 62, and when
the cover has been moved rearwardly sufficiently to permit
fasteners to be loaded into guideway 132. Obviously, the cover's
fastener loading position may be altered by changing the position
of abutment 147 on cover 140 with respect to detent 150. The cover
140 is then prevented from further rearward movement from the
fastener-loading position by the engagement of abutment 147 with
one of the wide sections 250, the cover being in any of the opposed
groove pairs 138. It will be noted that cover 140 is thus held in
the fastener-loading position without the use of fixed connections,
such as a spring connection, with the stationary parts of magazine
assembly 36.
The narrow diameter sections 350 on detent 150 are axially located
thereon as to be adjacent grooves 138 in leg 136 when detent 150 is
depressed; the width of sections 350 are such that abutment 147
will pass by detent 150 as cover 140 is moved farther rearwardly.
Therefore, it is necessary only to depress detent 150 disengaging
it from abutment 147 to remove cover 140 entirely from the guideway
132 after the cover has been moved to the fastener-loading
position. It will be noted that detent 150 is held in the depressed
position as cover 140 is moved rearwardly out of guideway 132 by
the downward force brought to bear on the wide section 250, which
had held the cover in the fastener-loading position, by the wider
portion of flange 143 commencing at abutment 147.
Therefore, in order to load a fastener stick into the guideway 132,
it is necessary only to depress detent means 152 which will allow
the cover 140 to be moved rearwardly from its closed or operative
position to the fastener-loading position at which point detent
means 150 in conjunction with abutment 147 will hold it. It is
apparent from the above description that when the guideway 132 is
empty, pusher 38 will be urged forwardly by spring means 158, but
with the cover in the fastener-loading position the pusher 38 will
be in the rearward portion of the guideway 132 permitting a
fastener stick S to be loaded therein. Cover means 140 may then be
moved forwardly toward its operating position closing the magazine,
and as the cover is moved forwardly, the forward motion of pusher
38 will be halted by its engagement with the rear portion of
fastener stick S. When the cover is fully forward, arcuate slot 145
will allow detent means 152 to move upwardly under the impetus of
the spring 62 upon which it is mounted so that a wider diameter
section 252 on the detent means will engage with the arcuate slot,
again locking the cover in the fully closed position.
Cover means 140 may readily be removed from the guideway 132, when
it is in the fastener-loading position, by merely depressing detent
means 150. By so doing, the wider diameter section 250 of detent
means 150 is removed from engagement with abutment 147, and the
flared portion of flange 143 will be allowed to slide by detent
means 150 while holding the wider diameter section thereof
downward. Thus, it can be seen that only two simple manual steps
are required to completely remove cover means 140 from the guideway
132 in order to replace the cover in a different one of the pairs
of opposed grooves 138. When this is done, in order to replace the
cover it is necessary only to simultaneously depress detents 150
and 152 allowing the flanges 143 and 144 to slide by the detent
means. It will be noted that in none of the aforementioned steps
for removing and replacing cover means 140, was it necessary in any
way to remove any part from or dismantle the magazine assembly.
Furthermore, it will be noted that the relationship of base 134 of
the guideway 132 to the inclined surfaces 52 and 54 at all times
stays the same regardless of the fastener height being used.
FIGS. 16 through 19 illustrate two alternate embodiments of a
detent means for retaining the cover in the magazine assembly and
for releasing it, allowing it to be removed therefrom, in which a
single detent is used to accomplish both operations. It will be
noted that the illustrations of these embodiments do not include
many of the structural details of the preferred embodiment
discussed above. This was done for the purposes of making more
clear the description of the detent means to demonstrate that such
detent means may be used with a variety of fastener magazine
configurations. In each of these FIGS. like numerals are used to
identify like elements.
In the FIGS. 16 and 17 embodiment, an elongated U-shaped magazine
guideway member 64 is used having inwardly opening grooves 66 in
the upper portions of the legs thereof forming opposed pairs. In a
vertical hole 67 on one side and to the rear of the guideway, a
vertically-acting detent 68 is mounted on a leaf spring 69 which
biases the detent upwardly. The detent includes wide diameter
sections 168, intermediate diameter sections 268 relatively
narrower than sections 168, and narrow diameter sections 368
relatively narrower than sections 268. The number of each of these
sections on detent 68 corresponds to the number of grooves 66 in
said one side of guideway 64, and each of the grooves on said one
side are in communication with the detent means.
A cover means 70 is provided with an arcuate slot 72 in the rear
portion thereof on the edge or flange nearer detent 68, and when
the cover 70 fully closes guideway 64, slot 72 will be adjacent
detent 68. Sections 168 are of a width which will allow them to
engage with slot 72, and sections 168 are axially located on detent
68 so that such engagement will take place when detent 68 is
extended fully upwardly.
Sections 268 are axially located on detent 68 so that when detent
68 is depressed, disengaging one of the sections 168 from arcuate
slot 72, sections 268 will be aligned with grooves 66. The
diameters of sections 268 are such that when detent 68 is in this
position, cover 70 can be moved through the opposed pair of grooves
66 in which it has been placed rearwardly past detent 68.
The edge or flange of cover 70 nearer detent 68 flares outwardly at
the forward portion thereof forming an abutment 74. Sections 268
are of a width that will allow one of them, depending upon in which
the opposed pairs of grooves 66 cover 70 is placed, to engage with
abutment 74 thereby retaining cover 70 in the fastener-loading
position. It will be noted that as cover 70 is moved rearwardly to
the fastener-loading position, detent 68 is held in the
above-described depressed position by the downward force of the
edge of the cover acting on the section 168 previously engaged with
slot 72.
In order to release cover 70 from the fastener-loading position so
it can be removed from guideway 64 to be replaced in a different
one of the opposed pairs of grooves 66 in order to accommodate a
different fastener height, detent 68 may be depressed farther,
releasing detent 68 from engagement with abutment 74 thereby
aligning sections 368 which are axially located for this purpose
with grooves 66. The widths of sections 368 are such that the
flared portion of cover 70 commencing at abutment 74 will pass by
detent 68 as the cover is moved rearwardly. At the lower rear
portion of guideway 64 and beneath leaf spring 69, a second leaf
spring 65 is provided extending from approximately the center of
guideway 64 and inclined upwardly to the side of the guideway.
Spring 65 provides resistance to the downward travel of detent 68
allowing an operator to sense the position of the detent.
In the FIGS. 18 and 19 embodiment, a side-acting spring latch 78 is
mounted in one side of the guideway 64, and the grooves 66 on said
one side are in communication with the latch. The cover means 70 on
the edge adjacent latch 78 includes a slot 80 adapted to engage
with the latch in the rear portion of the cover when the cover is
in in the operative position, fully closing the magazine.
Proceeding forwardly on the cover, the edge adjacent the latch
inclines inwardly as indicated at 84 and abruptly outwardly to its
normal width forming an abutment 82. To move the cover rearwardly
to the fastener-loading position, it is necessary only to move the
latch 78 sideways out of engagement with the slot 80 and slide the
cover rearwardly. Because the spring energy of latch 78 biases it
laterally inwardly, it will ride along the edge of the cover during
the rearward motion thereof, and inclined edge 84 will guide the
latch into engagement with abutment 82 preventing further rearward
movement of the cover from the fastener-loading position. To remove
the cover 70 from the magazine 64, it is necessary only to move the
latch 78 sideways again out of engagement with abutment 82 and
slide the cover rearwardly out of the magazine. To replace the
cover in the magazine, it can be seen that it is necessary only to
hold the latch 78 sideways and allow the cover 80 to slide inwardly
to the desired position.
In each of the above described alternate embodiments of the detent
means for the magazine cover, it can be seen that removal of the
cover for purposes of height adjustment may be accomplished with
ease without in any way dismantling the magazine or removing
certain parts therefrom.
It will be apparent to those skilled in the art that the
embodiments described herein are only exemplary, and modifications
to the elements of the structure or their arrangement may be made
within the scope of the appended claims.
* * * * *