U.S. patent number 3,906,775 [Application Number 05/481,872] was granted by the patent office on 1975-09-23 for riveter having axially latchable clutch.
Invention is credited to Eliezer Benimetzki.
United States Patent |
3,906,775 |
Benimetzki |
September 23, 1975 |
Riveter having axially latchable clutch
Abstract
In a riveting device, comprising chuck means adapted to receive
the mandrel of a blind rivet to exert a cycle of pulling the
mandril to set the rivet and break the mandrel and to eject the
thus broken mandrel, a means for latching the clutch comprises an
axially shiftable member so that the riveting device is latched for
a cycle of operation by a simple axial push upon the drive shaft. A
bit has a power transmission collar. The drive shaft has a well in
which there is a socket. The combination of bit and collar is
inserted into the well in the driveshaft whereby the pin and spiral
association between collar and socket permit power transmission
from the electric drill to the driveshaft. Thus an electric drill
having such bit and collar can be used alternately for
hole-drilling and power transmission for the riveting device.
Inventors: |
Benimetzki; Eliezer (New York,
NY) |
Family
ID: |
11047200 |
Appl.
No.: |
05/481,872 |
Filed: |
June 21, 1974 |
Foreign Application Priority Data
Current U.S.
Class: |
29/243.526;
279/76 |
Current CPC
Class: |
B21J
15/16 (20130101); B21J 15/043 (20130101); B21J
15/26 (20130101); Y10T 279/17761 (20150115); Y10T
29/53752 (20150115) |
Current International
Class: |
B21J
15/00 (20060101); B21J 15/26 (20060101); B21J
15/16 (20060101); B21J 15/04 (20060101); B21J
015/34 () |
Field of
Search: |
;72/391,114
;279/1DC,76,86,1A,83 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Lanham; C. W.
Assistant Examiner: Crosby; Gene P.
Attorney, Agent or Firm: Ewbank; John R. Steinberg; Melvin
A.
Claims
The invention claimed is:
1. In a riveting device for a blind rivet having a mandrel, such
device comprising a tubular housing, means for converting rotary
power of a drive shaft to a cycle of axially shifting an internal
member, a chuck adapted to grip a mandrel during its rearward axial
shift with said internal member, and means for ejecting the mandril
subsequent to the breaking thereof, the improvement which
includes:
clutch means associating the drive shaft with the axially shifting
internal member;
latching means adapted to engage said clutch means whenever the
drive shaft is axially shifted forwardly from a rest position by a
manual push;
unlatching means adapted to disengage said clutch means and to
return the drive shaft rearwardly to its rest position, said
unlatching means being responsive to the rearward axial movement of
means moving with the chuck near the end of the rearward movement
portion of the cycle of operation, and;
said clutch means, latching means, and unlatching means including a
tubular collar of the drive shaft adapted to latch the clutch means
when shifted in a forward position to compress split-nut means into
engagement with an axially shiftable screw at its rest position,
said screw disengaging the clutch by shifting the axially shiftable
collar for a predetermined distance to its rest position, there
being a spring adapted to urge the screw to its rest position upon
the disengagement of the clutch, and there being a pair of springs
to expand the split-nut to its rest position upon the disengagement
of the clutch.
2. Riveting apparatus in accordance with claim 1 wherein the drive
shaft of the riveting device has a well adapted to receive a bit
held in the chuck of a hand held rotating drill, said bit having a
power transmission collar having one spiral surface engageable with
one pin, and said drive shaft well having one pin engageable for
power transmission purposes with the pin receptive spiral surface
of such collar.
Description
FIELD OF INVENTION
This invention relates to tools adapted to set the type of blind
tubular rivet which has a mandril which can be pulled to anchor the
remote portion of the blind rivet. The invention also concerns the
combination of a power transmission collar and power transmission
socket powering a supplemental tool used intermittently with a
hand-held electric drill for minimizing loss of time in shifting to
and from drilling holes and use of such supplemental tool.
PRIOR ART
In the installation of duct work and other custom built
construction, there are situations in which there is need for
fastening components by the installation of a rivet from one side.
For several years there have been blind rivets having a setting
means comprising a mandrel and an enlarged head. The nose of a
riveting tool is held against the radially enlarged flange of the
rivet as the mandrel of the blind rivet is pulled, thereby causing
the remove portion of the tubular blind rivet to be expanded, set
and anchored as the head is pulled rearwardly. The blind rivet is
equipped with a narrow neck portion so that immediately after the
mandril has been pulled sufficiently to achieve the desired
anchoring or the remote portion of the blind rivet, the neck breaks
and the mandrel is pulled from the head. The opening in the blind
rivet is sealed because the head remains in the remote portion of
the rivet.
The riveting guns which have been employed heretofore in achieving
the riveting of blind rivets have included means so that when there
was the cycle of operation, a chuck would grip the mandrel and pull
the mandrel until the setting of the rivet and the breaking of the
neck of the pulling pin. When the riveter chuck was being returned
to its rest position the chuck would release, and the mandrel would
be ejected from the riveting device. A significant portion of blind
rivets have been used in factories where compressed air was
available. The compressed air type of riveting device has been much
used.
In the construction of buildings however, compressed air tools are
less convenient than electric tools. Holes are often drilled by
hand-held electric drills. Electrically operated riveting devices
have been employed in field installation of blind rivets. Young
U.S. Pat. No. 3,774,437 exemplifies a riveting device scheduled to
be actuated by an electric drill. The drive shaft of the Young
device includes a stub which can be inserted into the chuck of an
electric drill. Radial pressure is applied to latch the clutch into
engagement in the Young device. The usefulness of a riveting device
is dependent to a significant extent on the number of completed
operations of rivet installations which the mechanic can complete
in an hour. The cost of a riveting tool is less than the week's
salary of a worker. The speed of operation has generally been more
significant than the cost of the riveting tool. Notwithstanding the
thousands of persons using electric drills to drill holes into
which they inserted blind rivets, there has not been any
satisfactory solution for the long standing demand for a riveting
device permitting fast installation of blind rivets in the field,
that is, outside of factories equipped with tools for routine
production.
SUMMARY OF THE INVENTION
In accordance with the present invention, a riveting device is
provided with a clutch which can be engaged by a latching mechanism
which is shifted to the latched position by a simple pushing
forward on the drive shaft. Some such type of forward pushing on a
portion of the riveting device is a necessary feature of the
operation of substantially any riveting device because the nose of
the riveting tool must be pushed against the flange of the blind
rivet after placement in its hole. Thus the present invention
avoids loss of time inherent in the prior art types of separate
operation for latching.
In accordance with the present invention conveniently connectable
and disconnectable power transmission means are provided for
driving a supplemental tool such as a screw driver, riveter, etc.,
with an electric drill. The drive shaft of the supplemental tool is
provided with a well adapted to receive both the bit and a collar
attached near the chuck end of the bit, the collar having one
spiral surface adapted to engage with and transmit power to one pin
extending into the well of the drive shaft. The pin is adapted to
engage for power transmission purposes with such spiral surface of
the collar. By the use of the advantageous collar and cooperating
socket in the well of the supplemental tool, the holes can be
drilled with the bit in the electric drill and then between the
hole drilling steps, the supplemental tool can be used by inserting
the bit and collar into the well of the drive shaft of the
supplemental tool. An advantageous method of operation is possible
by the use of such power transmission system.
DESCRIPTION OF DRAWINGS
FIG. 1 is a longitudinal cross sectional view of a riveting tool
constructed in accordance with the invention.
FIG.. 2 is in part a plan view and in part a cross sectional view
of some internal portions of FIG. 1, but with the apparatus turned
90.degree. from that shown in FIG. 1.
FIG. 3 is a longitudinal cross sectional view with certain parts
shown in elevation and is somewhat similar to FIG. 1 except that
the drive shaft is shifted axially forward to latch the clutch and
to close the split nut into engagement with the axially shiftable
screw of the tool.
FIG. 4 is a cross section taken on line 4--4 of FIG. 1 showing the
manner in which the chuck of the riveting tool can grip the mandrel
of a blind rivet.
FIG. 5 is a cross section taken on line 5--5 of FIG. 1 showing an
intermediate support adapted to permit an axially shiftable
assembly to slide axially for the reciprocating action of a cycle
of riveting and securing such assembly so that it does not
rotate.
FIG. 6 is a cross sectional view of a split nut having a pair of
springs urging the two halves of the split nut into an open
position, the nut being adapted for compression into engagement
with a screw when the clutch is latched into engagement.
FIG. 7 is a cross sectional view taken on line 7--7 of FIG. 1
showing an axially slidable collar, there being a pin and slot
connection between the driving collar and the carrier member for
the split nut.
FIG. 8 is a cross sectional view, taken on line 8--8 of FIG. 1
showing the manner in which the power transmission collar secured
to the bit of an electric drill engages a pin in the socket portion
of the well in the drive shaft of the tool.
FIG. 9 is a cross sectional view resembling FIG. 1 except that the
threaded rod is not at its rest position but near the end of its
rearward shifting, as the clutch is about to be disengaged by such
powered shifting of the threaded rod.
FIG. 10 is a perspective view of a power transmission system,
utilizing a collar attached to a bit in a drill having a motor
rotating the bit.
DESCRIPTION OF ILLUSTRATIVE EMBODIMENT
FIGS. 1 through 9 show one illustrative embodiment of a riveting
tool 20 have a casing 21, forward sleeve 23 and an intermediate
support 22. Any of several nose pieces 24 may be in threaded
engagement with the forward sleeve 23. The opening 25 in nose piece
24 can be selected to accomodate a suitable range of sizes of
mandrils. A rear plug 26 is in threaded engagement with the casing
21. A bearing 27 and grease seal 28 in rear plug 26 are in slidable
and rotatable engagement with a drive shaft 30. The outer
appearance of the riveting tool is controlled by such drive shaft
30, rear plug 26, casing 21, intermediate support 22, forward
sleeve 23 and nose piece 24.
A rotatable assembly 29 comprises drive shaft 30 and the internal
portions of the device which rotate with drive shaft 30. As shown
in FIG. 2 the drive shaft has a well 31 adapted to accomodate a bit
and a well 32 adapted to accomodate a collar 35 secured to bit 34
by sunken set screw 35a. A pin 33 serves as a power transmission
socket in well 32. Pin engageable surfaces 37, on collar 35 serve
to make the collar 35 a power transmission means. Such pin
engageable surfaces 37 are approached through the balance of the
circumference by spiral surfaces 36, thus making the socket
self-guiding. The collar 35 can be attached to bit 34 by sunken
set-screw 35a before or after the bit is in the electric drill
chuck. The combination is adapted for insertion into the wells 31,
32, in the drive shaft, so that the bit need not be removed from
its chuck to drive the supplemental tool.
Inside the casing, and comprising a part of the rotatable assembly
29 is collar 38 having a slot 39. A pin 41 is threaded into carrier
40 and fits into slot 39 for transmission of power from drive shaft
30 and collar 38 to carrier 40. A bearing 42 secured to carrier 40
serves as both a rotating bearing and thrust bearing. There are
left hand threads for connecting the intermediate support 22 and
casing 21, whereby the intermediate support is not loosened by
rotary forces exerted against it. Bearing 42 is secured against a
rear wall of intermediate support 22 by appropriate means such as
an expansion ring 43.
In any riveting device for securing blind rivets, it is desirable
to avoid excessive weight and inertia in the components which are
subjected to the reciprocating cycle of rearward axial movement and
return to the forward rest position. An axially shifting assembly
44 of the illustrative embodiment is particularly advantageous
because it constitutes only a small proportion of the total weight
of riveting device 20. A chuck nose 45 is threadably engaged with
an internal member 46. Cam surfaces 47 inside the chuck nose 45
engage with cam surfaces 48, 49 on jaws 50, 51 so that when chuck
nose 45 is shifted rearwardly, the jaws grip mandril 52. When the
chuck nose 45 is returned to its rest position, cam surfaces 53, 54
on the pair of jaws 50, 51 engage with cam surface 55 at the inside
of nose piece 24, thereby releasing the jaws from their gripping of
mandril 52. A bore 56 in internal member 46 accomodates a spring 57
forwardly urging an ejection cap 58 having a bore 59 adapted to
receive the rear portion of mandrel 52. When the pin or mandril is
inserted in the chuck, it tends to push cap 58 rearwardly against
the urging of spring 57. When the internal member 46 is returned
forwardly to its rest position the inertia of the cap 58 and the
action of spring 57 help to promote the ejection of the mandril
during such final stages of the cycle of operation of the riveting
device.
As shown in FIG. 5, intermediate support 22 has an opening 60 which
opening is not round. Thus opening 60 restrains internal member 46
from rotating. Internal member 46 is thus permitted to have only
forward and rearward axial movement. Internal member 46 may have a
pair of flat surfaces 61 in engagement with opening 60. The
intermediate support 22 supports internal member so that no support
is necessary at either the chuck nose 45 or at threaded rod 62. As
shown in FIGS. 1 and 6, a pair of split nuts 63, 64 are urged apart
by springs 65, 66. The split nuts 63, 64 are held in and rotated by
carrier 40. The split nut has a surface 69 engageable with the
forward end of collar 38 so that the threaded portion of the split
nut is spaced only a slight distance from threaded rod portion 62
of internal member when in the rest position shown in FIGS. 1 and
2. Each split nut 63, 64 has cylindrical surface 68 corresponding
generally to the cylindrical surface of carrying member 40. A
principal portion of the internal surface of collar 38 has a slip
fit with such diameter of carrier 40. The forward edge of collar 38
is cam surface 70 adapted to engage cam surface 71 between small
diameter surface 69 and large diameter surfaces 68 on split nuts
63, 64. Particular attention is directed to the difference between
FIG. 1 and FIG. 3. Collar 38 engages small diameter surface 69 of
split nuts 63, 64 in FIG. 1 but is shifted axially forward to
engage the large diameter 68 of nuts 63, 64 in FIG. 3. Such axial
shifting of the collar from its rearward rest position to its
latched forward position is accomplished by a simple pushing
movement on the drive shaft 30. The operation of inserting a blind
rivet in a hole necessitates setting the nose piece 24 against the
exposed flange of the blind rivet so that the latching of the
clutch, involving such simple push forward of the drive shaft 30,
is a step which the operator readily learns without any significant
loss of time in the riveting operation.
As soon as the electric drill (after the collar 35 has engaged pin
33) rotates the drive shaft 30 while collar 38 maintains the
engagement of split nuts 63, 64 with threaded rod 62, the axially
shiftable assembly 44 begins its rearward axial movement.
As shown in FIG. 7 a pin 41 which is threaded into carrier 40, fits
into slot 39 of power transmission collar 38. A bore at the axis of
carrier 40 is shown as an opening through which (see FIG. 9) it is
possible for threaded rod 62 to axially shift.
As shown in FIG. 8, bit 34 carries collar 35 having pin engageable
surfaces 37 which are automatically self-guided into engagement
with pin 33 by spiral surfaces 36. Drive shaft 30 has a well 32. If
pin 33 becomes worn, it is readily replaced by unthreading the
recessed screw and threading in a new pin.
The shifting of the collar 38 between its two positions, engaging
either clutch engagement surface 68 of split nuts 63, 64 or clutch
disengagement smaller diameter surface 69 of split nuts 63, 64
serves to engage or disengage the clutch. When the clutch is
engaged as shown in FIG. 3, the rotation of the drive shaft 30,
collar 38 and carrier 40 causes the split nuts 63, 64 to rotate as
part of the rotating assembly 29. Such rotation of split nuts 63,
64 transmits power to threaded rod 62 (a screw) which is thereby
axially shifted rearwardly, thereby pulling the mandrel and setting
the blind rivet. The shape of threads in split nut 63, 64 and
threaded rod 62 are adapted for power driven screws and not for
fasteners.
As shown in FIG. 9 the end 72 of threaded rod 62 is rearwardly
advanced until it engages a rear wall 73 of collar 38. Thereafter
the rearwardly moving rod 62 pushes the collar 38 until its inner
walls 67, are shifted from large diameter 68 to small diameter 69,
thereby disengaging the clutch and terminating the power driven
rearward movement of collar 38.
While the rotating split nuts 63, 64 are axially shifting the
threaded rod 62 rearwardly, a spring 74 is being compressed. Hence
as soon as threaded nuts 63, 64 are spread apart by the
disengagement of clutch means 75 the axially shiftable assembly 44
is returned to its rest position by the action of spring 74.
In the operation of the riveting device, the drive shaft 30 is
pushed to latch the clutch means 75 with collar 38 over large
diameter 68 of split nut 63, 64. The collar 35 is inserted into
well 32 so that the cam 37 on collar 35 engages pin 33 in well 32.
The bit extends into well 31. When the electric drill is started,
the drive shaft 30 is driven, thereby rotating the split nut 63,
64. Threaded rod 62 is axially shifted rearwardly, thereby pulling
mandrel 52 gripped by the pair of jaws 50, 51 in the chuck nose
45.
Blind rivet 80, as it is initially employed, comprises tubular
shank 81 and radially enlarged flange 82, so that the rivet does
not go through the relatively snug hole into which the shank 81 is
positioned. The blind rivet comprises setting means 83 including a
head 84 having cam surfaces adapted to enlarge the diameter of the
remote portion of the tubular shank 81 as the head 84 is drawn
rearwardly by the tool 20. A neck 85 connects the head 84 with
mandrel 52 for the pulling of the head 84 from its rest position to
the anchored position. The neck 85 is sufficient tensile strength
to permit the anchoring of the remote portion of the rivet but the
neck 85 does break when the head 84 is shifted into its final
position, thereby releasing the mandrel 52 from the blind rivet.
The jaws 50, 51 continue to grip the mandrel 52 during its rearward
movement, but when the spring 74 returns the axially shiftable
assembly 44 to its rest position, cam 55 on nose piece 24 engages
with cams 53, 54 on jaws 50, 51 to automatically open and release
the jaws from the mandrel 52 so that mandrel 52 can be ejected by
the inertia action of ejection cap 58. It should be noted that the
rearwardly shifting threaded rod 62 eventually engages rear wall 73
of the bore of collar 38 thereby power driving collar 38 from
engagement position, whereby walls 67 of the internal surface of
collar 38 engage with small diameter surface 69 of split nuts 63,
64 instead of the large diameter surfaces 68 of said split nuts 63,
64. Thus there is power disengagement of clutch means 75. The
clutch means 75 is latched for a controlled cycle of operation
comprising such power disengagement of the clutch means.
Any tool such as a riveter, screw driver, or other device used
intermittently with an electric drill having a bit for drilling
holes can benefit from the advantageous power transmission means of
the invention. As shown in FIG. 10, a collar 35 is secured to a bit
34 with a recessed set screw 35a. The collar 35 has a spiral
surface terminating in a cam 37 engageable with pin 33 in the
socket or well 32. The combination of such well 32 and pin 33 can
be treated as a socket for power transmission from power
transmission collar 35. Particular advantages are obtained because
there is only a single pin and a corresponding cam on the collar.
The self guiding socket functioning are not as effective at such
small diameter if, for example, four pins and four spirals are
used.
Under normal circumstances the drive shaft is latched into
engagement prior to the insertion of the power transmission means.
The latching of the clutch can occur after the collar 35 is
inserted in well 32. The small inertia of the axially shiftable
assembly is advantageous during any engagement of the clutch means
75 while the drive shaft 30 is rotating.
The various illustrative embodiments are merely examples of
concepts more accurately defined in the appended claims.
* * * * *