U.S. patent number 3,748,936 [Application Number 05/208,142] was granted by the patent office on 1973-07-31 for method and apparatus for detachment of fasteners.
This patent grant is currently assigned to Knogo Corporation. Invention is credited to Arthur J. Minasy.
United States Patent |
3,748,936 |
Minasy |
July 31, 1973 |
METHOD AND APPARATUS FOR DETACHMENT OF FASTENERS
Abstract
A severing device having a stationary and a movable cutting
blade with the edges of each facing each other and the movable
blade is actuated by a toggle-like linkage so that the blades come
together to shear an element which drops into a chute. The blades
are designed to overlap a very small but finite amount upon
completion of severing.
Inventors: |
Minasy; Arthur J. (Woodbury,
NY) |
Assignee: |
Knogo Corporation (Westbury,
NY)
|
Family
ID: |
22773346 |
Appl.
No.: |
05/208,142 |
Filed: |
December 15, 1971 |
Current U.S.
Class: |
83/162; 83/604;
83/630; 269/201; 83/167; 83/605; 83/694; 269/228 |
Current CPC
Class: |
B26D
1/08 (20130101); Y10T 83/222 (20150401); Y10T
83/8809 (20150401); Y10T 83/2209 (20150401); Y10T
83/8845 (20150401); Y10T 83/9447 (20150401); Y10T
83/8808 (20150401) |
Current International
Class: |
B26D
1/08 (20060101); B26D 1/01 (20060101); B26d
007/06 () |
Field of
Search: |
;83/162,167,536,604,605,613,627,630,694 ;269/201,228,302 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Juhasz; Andrew R.
Assistant Examiner: Bray; W. D.
Claims
What is claimed is:
1. A detachment device for removal of labels held to merchandise by
means of a tack-like fastener element whose shank passes through
the label and the merchandise and into a thick button element where
it is secured, said detachment device comprising a base, a pair of
cutter blades mounted above said base with their cutting edges
facing each other, a blade actuator mechanism for driving on of the
cutter blades toward the other, a thin plate-like cover member
secured to the base and covering said cutter blades and actuator
mechanism and lying immediately adjacent said cutter blades along
the plane of their path of relative movement, said cover member
being found with an opening to accomodate a thick button element of
a label attachment means to be severed, said opening being located
at a position such that said cutter blades meet near the center of
said opening.
2. A detachment device according to claim 1 wherein a guide chute
is provided below and between said blades to catch objects severed
thereby and to direct said objects out from inside said cover.
3. A detachment device according to claim 2 wherein said guide
chute has resiliently moveable walls which widen to accomodate the
entire cover opening while said cutter blades are farthest apart,
said guide chute walls being deflectable to be closed in by the
coming together of said blades.
4. A detachment device according to claim 1 wherein each blade is
beveled by a major amount in the same direction as the other blade
to form cutting edges in substantially the same plane, one of said
blades having an additional minor bevel in the opposite direction
along its cutting edge to offset the plane of its cutting edge a
slight but finite amount with respect to the cutting edge of the
other blade to permit a slight overlapping of the blade edges
without destruction of the sharpness thereof as the blades are
brought together.
5. A detachment device according to claim 1 wherein said cutting
edges are formed by a bevel on the edge of said cutter blades, the
bevel being in the same direction for each blade so that the
resulting cutting edges are formed in substantially the same
plane.
6. A detachment device according to claim 1 wherein the plane of
the cutting edge of one blade is offset a small but finite amount
with respect to the plane of the cutting edge of the other blade to
permit a slight overlapping of the blade edges without destruction
of the sharpness thereof as the blades are brought together.
7. A detachment device for removal of labels held to merchandise by
means of a tack-like fastener element whose shank passes through
the label and the merchandise and into a thick button element where
it is secured, said detachment device comprising a base, a pair of
cutter blades mounted above said base with their cutting edges
facing each other, means guiding said blades for relative movement
toward and away from each other in the plane defined by their
cutting edges, means for actuating blade movement, the last
mentioned means comprising a toggle link mechanism mounted on said
base and connected to one of said cutter blades said toggle link
mechanism being arranged on said base to be in fully extended
condition when said cutter blade edges have come together.
8. A detachment device according to claim 7 wherein said toggle
link mechanism comprising a first lever mounted for pivotal
movement about a fixed pivot on said base, one end of said lever on
one side of said pivot being formed as a handle, a connecting link
pivotally connected at one end to the other end of said first lever
on the other side of said pivot, the other end of said connecting
link being pivotally connected to a guide bar to which is connected
said moveable blade and means fixed on said base for guiding said
guide bar for reciprocal movement along a line which extends to
said fixed pivot.
9. A detachment device for removal of labels held to merchandise by
means of a tack-like fastener element whose shank passes through
the label and the merchandise and into a thick button element where
it is secured, said detachment device comprising a base, a first
cutter blade fixedly mounted on said base to extend thereabove with
its cutting edge substantially parallel to the base, a second
cutter blade, an actuator mechanism mounted on said base and
constructed and arranged to move said second cutter blade back and
forth along and above said base so that its cutting edge moves
against and away from the cutting edge of the fixed first cutter
blade, the cutting edges of the two blades being parallel to each
other and lying in a common plane, a thin plate-like cover member
also fixedly mounted on said base and covering said cutter blades
and lying immediately adjacent said cutter blades along the plane
of their path of relative movement, said cover member being formed
with an elongated opening, a portion of said opening extending over
said fixed cutter blade and traversed by the cutting edge of said
fixed cutter blade, the remainder of said opening being
sufficiently large to accomodate a button element and located in a
position to be cleared by the second cutter blade when moved away
from the cutting edge of the first cutter blade.
Description
This invention relates to the removal of labels from articles of
merchandise and more particularly, it concerns a novel severing
device for cutting through a thick plastic button element and a
shank enclosed thereby to release a label from an article of
merchandise.
The present invention is suited for detachment of labels held to
articles of merchandise by label attachment means of the type shown
and described in U. S. Patent Application Ser. No. 599,922 filed
Dec. 7, 1966, now U.S. Pat. No. 3,628,267 and in U. S. Patent
Application Ser. No. 6,004 filed Feb. 7, 1970 now U.S. Pat. no.
3,656,679. In those applications, there is described a label
attachment means comprising a tack-like element whose shank pierces
an article of merchandise and a label, and a thick button element
which fits over the end of the tack shank. The button element is
pushed up along the shank so that the merchandise and the label
become tightly squeezed together between the head of the tack-like
element and the button element. The shank of the tack-like element
is secured to the button element at a location therealong removed
from the end of the button element which pushes against the label
and the article of merchandise. Thus, when the button element and
tack shank are severed, the fastening arrangement is released and
the label may be removed without harm to the merchandise.
In the aforementioned applications, there is described a tool for
severing the button element and the tack shank. The present
invention is a new and useful improvement to the removal tool of
those applications.
According to the present invention, there are provided a pair of
knife-like cutter blades whose cutting edges face each other. The
blades are mounted and arranged to move toward and close in on each
other for severing a label attachment button element and a tack
shank enclosed thereby. Immediately above and adjacent the cutter
blades, there is provided a thin plate-like cover member. The cover
member is formed with an opening through which the label attachment
button element can be projected into the path of cutter blade
movement. The opening is arranged such that the cutter blades close
near the center thereof so that both blades do a similar amount of
cutting. By using two blades in this manner and causing each blade
to cut both the button element and the tack shank, the tack shank
is severed in a manner that no burr is formed along one side
thereof. In the past, difficulties had been experienced with the
laterally projecting burrs which resulted from the severing action
of cutter blades on the tack shank. These burrs would snag on and
sometimes tear the merchandise when the severed tack was removed
after the severing operation. With the dual cutter arrangement of
the present invention, both cutter blades close in on the tack
shank from opposite sides thereof and their combined cutting action
forms a tapered configuration at the end of the severed tack shank.
This tapered configuration has a far smaller burr than that which
resulted from cutting with a single blade. Further, any burr which
is formed is confined to the end of the tapered configuration and
lies well within the lateral extent of the tack shank.
In order to ensure that both cutter blades perform a substantially
equal amount of cutting so that they both reach the tack shank and
cut into it after the button element has been severed, there is
provided a thin plate-like cover member which lies immediately
adjacent the cutter blades along the plane of their path of
movement. This cover member is formed with an opening which is
located such that it opens between the cutter blades when they are
apart and such that the cutter blades close near the center of the
opening. The button element to be severed is positioned in this
opening in the path of cutter blade movement and is stabilized
thereby during the cutting operation.
According to one aspect of the present invention, substantially
equal cutting action by two cutter blades is obtained by operating
only one of them. This is achieved by maintaining one of the cutter
blades stationary on a base and actuating the other blade for back
and forth movement along the base relative to the first cutter
blade. Further, according to this aspect of the present invention,
the cover member is provided with an elongated opening and the
stationary cutter blade extends part way across this opening. The
remainder of the opening, which is cleared by the movable cutter
blade in its opened position, is large enough to accommodate the
button element to be severed. Then, as the movable cutter blade
closes in on the stationary blade, both blades operate to cut the
button element from opposite sides and thereafter sever the tack
shank. During the process, the button element moves back along the
elongated opening against the stationary cutter blade at
approximately half the velocity of the movable cutter blade.
According to another aspect of the present invention, there are
provided novel arrangements for controlling the closure of the
cutter blades so that a well defined cut is made with maximum force
being applied to the tack shank being severed at the end of the
severing operation and yet with minimum damage to the cutter edges
themselves. The edges of the cutter blades of the present invention
are bevelled on one side, and one of the blades is formed with a
very small but finite additional bevel on the opposite side. This
additional bevel permits a small but positve overlap of the blades
when they close in upon each other. In addition, the cutter blade
movement is obtained through a toggle linkage which obtains a
maximum closing force at the closed position, and at the same time
is self-limiting in its closure movement. This self-limiting
closure movement provided by the toggle linkage, however, does not
detract from the closing force experienced by the button element
and tack shank being severed. Thus, a clean sharp cut is obtained
without appreciable cutter blade deterioration.
According to a still further aspect of the present invention, there
is provided a novel ejection chute arrangement which ejects the
severed-off portions of the button elements and tack shanks. This
novel ejection chute is made of resilient sheet material and is
formed to open sufficiently wide to accommodate the entire space
between the cutter blades when they are fully opened. The chute
extends down from its opening to an outlet near the bottom of the
cover member. Thus, any debris of foreign material which may fall
into the cover opening when the cutter blades are opened, will be
caught by the chute and guided to the outlet. In this manner, the
cutter blade actuator and guide mechanisms are protected. As the
cutter blades are closed the chute, because of its resilience, will
bend and narrow itself in response to the closing action of the
blades. However, because the chute is closed by the blade movement,
it remains centered with respect to the cutting action and,
therefore, remains in a proper position to accept the severed
portions of the button element and tack shank.
There has thus been outlined rather broadly the more important
features of the invention in order that the detailed description
thereof that follows may be better understood, and in order that
the present contribution to the art may be better appreciated.
There are, of course, additional features of the invention that
will be described hereinafter and which will form the subject of
the claims appended hereto. Those skilled in the art will
appreciate that the conception upon which this disclosure is based
may readily be utilized as a basis for the designing of other
structures for carrying out the several purposes of the invention.
It is important, therefore, that the claims be regarded as
including such equivalent construction as do not depart from the
spirit and scope of the invention.
A specific embodiment of the invention has been chosen for purposes
of illustration and description, and is shown in the accompany
drawings, forming a part of the specification wherein:
FIG. 1 is a perspective view showing a label detachment device, in
which the present invention is embodied, and a label having an
attachment element which is removed by the label detachment
device;
FIG. 2 is a perspective view showing the internal construction of
the label detachment device of FIG. 1, and showing a portion of the
cover thereof in exploded relation to the device;
FIG. 3 is an enlarged section view taken along line 3--3 of FIG. 1
at the initiation of operation of the label detachment device;
FIG. 4 is a view similar to FIG. 3, but showing the device at the
completion of a severing operation;
FIG. 5 is a view taken along line 5--5 of FIG. 3;
FIG. 6 is an enlarged fragmentary view of a portion of FIG. 3;
FIG. 7 is an enlarged fragmentary view of a portion of FIG. 4;
FIG. 8 is an enlarged side elevational view showing an actuating
mechanism in the detachment device of FIG. 1 at the initiation of
operation; and
FIG. 9 is a view similar to FIG. 8, but showing the actuating
mechanism at the completion of a severing operation.
The label detachment device of FIG. 1 includes a base 10 upon which
is mounted a box-like cover 12. The cover 12 is attached to the
base 10 by means of attachment screws 14. The cover 12 is formed
with a handle opening 16 at the rear thereof and an actuating
handle 18 extends out from this opening. The handle 18 is movable
up and down through an arc indicated by the arrow A in FIG. 1.
A top opening 20 is formed near the front of the cover 12. This
opening is elongated in the longitudinal direction of the cover
and, as shown in Fig. 1, there is provided a stationary cutter
blade 22 which extends trans-versely across the opening near the
forward end thereof. As will be explained more fully hereinafter,
when the handle 18 is depressed, a movable cutter blade (not shown)
moves forwardly under the cover opening 20 until it meets with the
stationary blade 22.
A flat wafer-like label 24 is shown in FIG. 1 to be secured to a
piece of fabric 26 by an attachment device including an attachment
button 28. The construction and operation of the button 28 is the
same as that shown and described in applicant's copending U. S.
Patent Application Ser. No. 599,922.
In operation of the label detachment device shown in FIG. 1, the
piece of fabric 26 (which may be a portion of an article of
merchandise) with the label 24 attached thereto by the button 28,
is laid on top of the detachment device so that the attachment
button 28 enters into the top opening 20. The handle 18 is then
depressed and the movable cutter blade squeezes the attachment
button 28 between itself and the stationary cutter blade 22; and
the two cutter blades cooperate to sever the attachment button
28.
Turning now to FIG. 2, it will be seen that there is provided a
rectangularly-shaped slab-like cover mounting block 30 located
centrally on the base 10. A stationary blade mounting block 32 is
secured to the base 10 immediately in front of the cover mounting
block 30. As can be seen, the stationary cutting blade 22 is
secured to the stationary blade mounting block 32 by means of a
pair of attachment screws 34. A movable cutter blade 36 is
positioned in the same plane as the stationary cutter blade 22 and
is movable relative to the stationary blade 22 in a direction
longitudinally of the label detachment device. The movable blade 36
is secured by means of attachment screws 38 to a movable blade
mounting block 40 which slides back and forth on the cover mounting
block 30. The lower portion of the movable mounting block 40 is
provided with a laterally extending flange 42 which is engaged by
guide blocks 44 to maintain the movable blade mounting block in a
fixed orientation for longitudinal sliding movement on the cover
mounting block 30. The guide blocks 44 are secured to the cover
mounting block 30 by means of attachment screws 46. A stop pin 48
is mounted in the cover mounting block 30 to limit the rearward
movement of the movable mounting block 40.
An actuator support bracket 50 is mounted on the cover mounting
block 30 rearwardly of the movable blade mounting block 40. The
actuator support bracket includes a bottom flange portion 52 which
is secured to the cover mounting block 30 by means of attachment
screws 54. The actuator support bracket 50 includes a forwardly
positioned tubular guide 56 and a rearwardly positioned pivot
support 58, both of which are substantially aligned with the
longitudinal axis of the base 10. An actuator rod 60 passes through
the tubular guide 56 and is secured to the movable blade mounting
block 40. The actuator rod fits closely inside and is guided for
longitudinal sliding movement within the tubular guide 56. A
connecting link 62 is pivotally connected between the forward end
of the actuating handle 18 and the rear of the actuator rod 60. A
fixed pivot 64 interconnects the pivot support 58 and a point on
the actuator handle 18 displaced a short distance from its forward
end. A stop element 66, which projects from the lower side of the
handle 18, serves to engage the actuator support bracket 50 in the
vicinity of its pivot support 58 so as to limit the extent of
downward movement of the actuator handle 18. It will be appreciated
that as the handle 18 is moved downwardly, the portion thereof
ahead of the fixed pivot 64 will move upwardly and outwardly toward
the front of the device. This forward movement is transmitted via
the connecting link 62 to the actuator rod 60 which is guided by
the tubular guide 56 for controlled longitudinal movement forwardly
of the device. This movement is communicated to the movable blade
mounting block 40 which, in turn, forces the movable blade 36
toward the stationary blade 22. The blades may be separated simply
by pulling up on the handle 18 which will reverse the action of the
actuator mechanism.
It will further be noted that there is provided between and beneath
the stationary and movable cutter blades, a guide chute 68 which
inclines downwardly to the side of the device. THe guide chute 68
is fashioned of sheet material bent to a generally U-shaped or
channel-shaped cross-section. The guide chute 68 is secured to the
stationary blade mounting block 32 by means of a fastening screw
70.
Turning now to FIG. 3 wherein the cutter blades 22 and 36 are shown
in their opened position, it will be seen that the guide chute 68
has an upper sidewall 72 which extends rearwardly of the forward
edge of the movable cutter blade 36, even when that cutter blade is
in its rearwardmost position. Thereafter, when the cutter blade 36
moves to its forwardmost position, its mounting block 40 engages
the wall 72 of the guide chute 68 and forces it in a forward
direction. When the cutter blade 36 is moved rearwardly again, the
wall 72 will follow this movement and revert to the position shown
in FIG. 3. By making the wall 72 of resilient material and mounting
it so that it can bend back and forth with movements of the movable
blade mounting block 40, it is possible to ensure that the cover
opening 20 will be fully accommodated at all times by the guide
chute 68 so that whenever any objects are passed into the opening
20, they will be guided by the chute 68. As can be seen in FIG. 1,
the bottom of the chute 68 communicates with an outlet opening 74
in the side of the cover 12 for the discharge of any material which
collects in the chute.
As can be seen in FIG. 3, when the label 24 is laid on top of the
cover 12, the attachment button 28 extends down into the opening
20. The attachment button 28 is held to the label and to the piece
of fabric 26 by means of a tacklike fastener element 76. The
tack-like fastener element has a shank which passes through the
fabric 26 and the label 24 and down through the center of the
attachment button 28. The lower end of the shank 78 is clinched
over and interlocks with the lower end of the attachment button 28.
When the cutter blades 22 and 36 come together, as shown in FIG. 4,
they sever not only the lower portion of the attachment button 28,
but also the shank 78 above where it is clinched over and
interlocked with the attachment button. As a result, as shown in
FIG. 4, when the severing action is complete, a lower portion 28a
of the attachment button 28 along with a lower end 78a of the tack
shank 78, is removed and these elements fall into the guide chute
68 and eventually pass out through the opening 74 of the cover 12.
With the button and shank thus severed, there is no interlock
between them and the label and piece of fabric may both be pulled
off the remaining portion of the shank and separated from each
other without damage to either.
Turning now to FIG. 5, it will be seen that when the button element
28 is placed into position for a cutting operation, it lies against
a cutting edge 80 of the stationary cutter blade 22 while a further
cutting edge 82, on the movable cutter blade 36, is displaced a
short distance from the button. When the movable blade 36 closes
against the button 28, its cutter edge 82 not only begins to sever
the button 28, but it also forces the button against the cutting
edge 80 of the stationary cutter blade 22. In this manner, the
cutting action is shared equally by the two blades so that they
will meet at the tack shank 78 to cooperate in severing it. It is
important that the two blades meet at the shank 78 since, as will
be described more fully hereinafter, this cooperative cutting of
the shank by both blades serves to prevent the occurrence of any
burrs on the remaining portion of the shank which might otherwise
snag on and damage the fabric 26 to which the label 24 is
attached.
FIGS. 6 and 7 show more clearly the action of the stationary and
movable cutter blades 22 and 36. As shown in FIG. 6, the two cutter
blades are aligned with each other and are in a position for
severing the button 28 and the tack shank 78. As the movable blade
36 proceeds in a leftward direction, as viewed in FIGS. 6 and 7,
its cutter edge 82 engages the side of the attachment button 28 and
begins to cut into the side of the button. At the same time, the
forces applied in a leftward direction to the side of the button 28
by the movable cutter blade 36, force the button itself in a
leftward direction against the stationary cutter blade 22 so that
its cutting edge 80 also cuts into the button 28 from the opposite
side thereof. Thus, in spite of the fact that only one of the
cutter blades is movable, the cutting action of the two blades is
substantially identical since the forces supplied via the movable
cutter blade 36 are used not only to cause the blade 36 to cut into
the element, but also to drive the button element into the
stationary cutter blade 22. In order for this action to occur, the
button element 28 must be capable of moving freely in a leftward
direction by an amount of approximately equal to one half the total
movement of the movable cutter blade 36. Thus, as shown in FIG. 7,
it will be seen that the attachment button 28 has moved a distance
approximately equal to one half its diameter upon the completion of
the cutting operation.
It will be seen from FIGS. 6 and 7 that both the stationary and
movable cutter blades 22 and 36 have their cutting edges 80 and 82
formed by virtue of a bevelled surface 84 extending upwardly from
their respective lower surfaces. The upper surfaces of the two
blades remain substantially coplaner in close sliding relationship
with the undersurface of the cover 12. A very small but finite
secondary bevel 86 is provided on the upper surface of the
stationary cutter blade 22 so that its cutting edge 80 is actually
positioned a very slight degree downwardly of the cutting edge 82
of the movable cutter blade 36. This configuration of the cutting
edges allows the movable cutter blade 36 to ride up slightly on the
stationary cutter blade 22, as shown in FIG. 7, upon completion of
a cutting operation. This permits the blades to come together fully
and even to overlap by a slight amount without damage to the sharp
edges of either blade.
FIGS. 8 and 9 illustrate the action of the actuator mechanism which
includes the handle 18, the connecting link 62, the actuator rod 64
and the actuator support bracket 50. As can be seen in FIG. 8, when
the cutter blades are in their opened position and the actuator rod
60 is pulled to its rearward position, the connecting link 62 is in
a position nearly perpendicular to that of the actuator handle 18.
Thus, pivotal movement of the actuator handle produces maximum
movement of the connecting link 62. When, however, the actuator
handle 18 is pushed downwardly, as shown in FIG. 9, all of the
pivot points between the actuator rod 60 and the connecting link
62, the actuator handle 18 and the fixed pivot 64 are in alignment.
In this region of actuator handle movement, the actuator mechanism
is incapable of producing any longitudinal movement of the actuator
rod 60.
It will be appreciated that as the actuator handle 18 moves from
the position shown in FIG. 8 to that shown in FIG. 9, a toggle-like
action is produced on the cutter blades 22 and 36. Two significant
advantages are achieved by this arrangement. Firstly, because of
the toggle effect, the maximum closing force is imposed upon the
blades at the completion of the severing operation, thereby
insuring that the blades will complete their cutting of both the
actuator button 28 and the tack shank 78, and a clean, sharp cut
will be produced with minimal burring.
Secondly, the toggle-like characteristic of the actuator mechanism
automatically prevents the movable blade from substantial overlap
of the stationary blade 22. The blades are thus protected from
damage which might occur if they were allowed to overlap to any
great extent. It will be appreciated that the arrangement shown
herein provides substantial improvement over other arrangements for
preventing blade overlap such as stop elements and the like. This
is because stop elements and the like generally become subjected to
wear and, therefore, will not, after much usage, maintain the
precise end positioning of the cutter blades. Moreover, and even
more importantly, when a stop element is used, the force of the
actuator mechanism is no longer fully communicated to the cutter
blades, but instead is divided btween the cutter blade and the stop
element so that a complete severing is not insured.
Having thus described the invention with particular reference to
the preferred form thereof, it will be obvious to those skilled in
the art to which the invention pertains, after understanding the
invention, that various changes and modifications may be made
therein without departing from the spirit and scope of the
invention, as defined by the claims appended hereto.
* * * * *