US2193599A - Fastener-applying device - Google Patents

Description

Mardi l2, 1940- A. H. MAYNARD ET AL 2,193,599

FASTENER -ARPLY ING DVI CE Filed Deo. l2, 1938 2 Sheets-Sheet 1 Mardi 12 1940- A. HQMAYNARD Erm. 2,193,599

FASTENER-APPLYING DEVICE 4 Filed Dec. 12, 1938 2 Sheets-Sheet 2 v Patented Mar. 12, 1.940;

f 4' l, UNITED N s'mfrl l FAsTENEn-APPLYING DEVICE y l Arthur H. vMaynard, Warwick, and Joseph M.r

Gambao, East Greenwich, R. I., assignors to. Boston Wire Sttcher "Company, Warwick, 1%. I., a corporation of Maine Application December 12, 193s, serai No. 245,106

At claims. Y(o1. i-sy' f This Ainvention is'a continuation-inpart of our prior` United States Letters Patent' No.y

' 2,181,904, granted Dec. 5. 1939, and relates to improveniente in fastener-applying devices for attaching papers and'other sheets.l securing tags and labels. to.k articles of commerceand* for ,use f generally in fastening or stitching together varions objects and articles.

" Oney object: of the invention is to provide an implement ofthe type indicated adapted for applying the lfasteners to the Work to form either` a permanent at stitch or atemporary pin-stitch.l

Another object of the invention is to provide an implement of the type indicated having a sliding anvil ywith selective means for effecting either ya at permanent stitch or a temporary pin-stitch.v c i -Another object of the invention is to provide an implementl oi the type indicated wherein the .fastener-applying means is held in raised posil.

` tion with respect to the work sumoortecl.y directly onthe `leasev of the implement until La fastener has been driven through the work andl thereafter moved toward thefwork to engage the ends of` thepro'jecting legs of the fastener with clinchving means on the base.

{Another object of the invention is to `provide an implement of the typeindicated wherein the yielding means for holding the fastener-applying means raised with respect to the wor-lr` on the base is carried by an arm on which the stapling means is mounted, either forwardly or rearwardly ofthe fastener-driving means. Another-object of the invention is to provide means for retaining the work in Aixedv position on the baseof the implement throughout the fastener-applying operation.

Still another object of the invention isl to provide an implement of the type indicated which zis of `simple and compact construction and prooi against derangement or getting out of order.

' Further objects of the invention are set forth in the following yspecication which describes several forms of construction of the implement,

,by way of example, as illustrated bythe accompanying drawings. In the drawings:v Fig. 1 is va perspective view of one type of implement incorporating the novelieatures of the present invention; .y

Fig. 2 is a part-sectional view of the implement -showing the anvil adjusted in position to form a pin-stitchV and the hand-lever depressed to` drive a staplewhile the stapling arm is heldin raised position with respect to the work;

Fig. 3 is a part-sectional View similarrto Fig. 2-

stitch;

showing the stapling arm depressed into engagement"with the work tof cause the legs ci the driven stapley to be bentV or clinched;

- l Fig. fi is a transverse sectional vview of a portion of the stapling arm sho-wing the means for attaching the elevating spring to the arm;

Figy. is a transverse sectional View von line `5--5 of Fig. 2 showing'the legs of 'the driven staple projecting from the stapling arm while the latter is held in raised position with respect to the work; l l

Fig;v 6 is a view similar to Fig. 5 showing the legs of the staple as. having been lientv outwardly by thelcamming grooves in the anvil as the stapling arm is moved toward the hase to form al pin-stitch;

' Fig. 'Z vis av view similar to Fig. 5 showing the endso-f the legs of the staple projecting' from `the vstapling arm and engaging'a dierent set of camming grooves in the anvil:

Fig. 8 is a view similar to Fig.. 7 lshowing the legs of the staple as. having been bent inwardly' by the camming grooves as they staoling arm is` moved toward the base to form a permanent Fig. 9 is apart sectional View of an implement-of modiied form of construction having a bowed'spring mounted on the arm forwardly of thedriver and engagealole with the work to maintain the arm raised with respect to the hase and to hold the work in place thereon; l

Fig. 10 is aside elevational view of the for- Ward portion of theimplernent illustrated in lig. 9 showing the stapling arm moved toward the base against the action oi the `bowed spring;`

' and Y Fig. 11 is avsideelevatio-nal view of an implement of another modied iorm of construction having a spring-pressed'plunger carried by 'the arm. forwardly of the. driver and rengagealole with the work to maintain the arm raised with respect to the base and to hold the work in place thereon. l

Although the invention is herein shown anddescribed as embodied in an implement for applying U-shaped Wire staples it may be applied to devices for'applying other types of fasteners. A standard typeI of desk stapler has Aa stapling arm embodying a 'magazine for the staples pivotally mounted on a ,base and staple-applying `mechanism at the en-d of the arm adapted to cooperate with an anvil on the base. With this typeofimplement a spring is provided for holding the stapling larm raised with respect to the It has heretofore been proposed to provide a,

device for iirst driving a staple through the work and thereafter forcing its straight, projecting legs outwardly to form a flat stitch, but such previously used implements require special clinching f means or other elements to cause the legs to be bent at their points of joinder with the crown without deformation. In the Maynard United States Patent No. 1,506,073, issued August 26, 1924, an arched spring-plate is mounted on the base overlying the clinching anvil to act to hold the work suspended above the anvil until the legs of the staple are driven therethrough. After the legs of the staple have been driven through the work the force applied causes the springplate to yield to effect engagement of the ends of the legs with camming grooves in the clincher-anvil. In the Cavanagh United States Patent No. 2,149,839, issued March '7, 1939, a work-supporter is pivotally mounted on the frame of the implement and is iirst operated to hold the work suspended above the anvil while a staple is driven therethrough. The work-supporter then yields to cause the ends of the staple-legs to be engaged with camming grooves in the anvil whereby to bend the legs into parallel relation to the crossbar to form a flat stitch.

In accordance with the present invention the spring for holding the stapling arm in raised psition with respect to the base is made suficiently stili to resist movement of the arm toward the work directly supported on the base until after the staple-driver has been actuated to penetrate the legs of the staple through the work. In other words, the spring for holding the stapling arm raised is more resistant than the spring for holding the staple-driver in raised position on the arm. After the legs of the staple have been peneti-ated through the work the arm moves toward the work to engage the ends of the projecting legs of the staple with camming grooves on the base to cause the legs to be rocked into parallel relation tc the staple-crossbar without substantial deformation intermediate their ends. In accordance with the present improvement the spring for holding the stapling arm raised with respect to the base while a staple is being driven initially may be carried by the arm and be positioned either forwardly or rearwardly of the staple-driver. Preferably, a slidable anvil mounted on the base of the implement is provided with separate sets of camming grooves whereby the staples may be applied to the work with either a permanent stitch or a temporary pin-stitch.

In its preferred form as herein illustrated the invention is embodied in a fastener-applying implement of the type shown and described in United States Letters Patent to Maynard, No. 2,037,334, issued April lll, 1936. Suffice it to state herein that the implementy comprises a base 2, a stapling arm 3 pivotally mounted on the base and an actuating lever fl pivotally mounted on the arm and connected to operate a staple-driver 5. The base 2 is preferably constructed of sheetmetal stamped or embossed to form a generally flat, rectangular top plate 6 bounded by a depending bevel flange '1. Fastened to the top plate 6 of the base 2 adjacent its rearward end is a hinge-block or mounting 8 for the stapling arm 3 which is formed as a hollow magazine for the staples s. The stapling arm 3 is pivotally mounted on a pin 9 carried by rearwardly-extending ears I0 on the hinge-block 8 with its ends projecting laterally through the depending sides of an inverted U-shaped member I I attached to the bottom of the arm. The sides of the member II overlie the sides of the hinge-block 8 on the base 2 to prevent lateral twisting of the arm 3 with respect to the base.

The stapling arm 3 is of channel-shape in cross-section, see Fig. 4, having an inverted vchannel-shaped core I5 extending longitudinally thereof and secured therein for supporting U- shaped staples s straddled thereacross. The forward end of the core I5 is provided with laterally-oiset, depending side flanges I6 having laterally-projecting latching lugs Il thereon. A channel-shaped member I8 is supported between the side walls of the arm 3 with its bottom wall I8 overlying the core I5 in spaced relation thereto to hold the staples in place thereon. The forward end of the arm 3 is closed by a U-shaped gate 2D,

having a front wall 2I which cooperates with the end of the core to provide a throat 22 through which the staples are driven and side walls 23 which overlie the sides of the core with notches 24 formed therein for cooperation with the lugs Il. The gate is pivotally mounted on the member I3 by means of a pin 25 which extends transversely through oval slots 26 in the side walls of the member with its ends secured to the side walls 23 of the gate. Thus, the pin 25 may pivot on the member I8 to permit the gate 20 to be swung away from the end of the core I5 to open the magazine. Normally, the gate 20 is held in closed position as illustrated in Fig. 1 by the notches 24 in its side walls 23 being yieldingly engaged with the lugsr I'I on the depending flanges I6 of the core I5. A hairpin-shaped spring 2l tensioned between the arm 3 and pivotpin retains the notches 24 in engagement with the lugs I'I. The staples s in the magazine are advanced along the core I5 toward the throat 22 by means of a pusher 28 and spring 29 connected thereto.

The staple-driver 5 is mounted to reciprocate in the throat T22 at the forward end of the arm 3, being connected to the lever 4 to be operated thereby. The lever l is of inverted channelshape in cross-section having opposite sides 3B overlying the sides of the arm 3 and a front wall 3l' overlying the forward end of the arm. The lever 4 is pivotally mounted on the arm 3 by means of a pin 38 extending transversely through the sides of the member I8 and the sides of the lever. Mounted on the inside face of the front wall 3l of the lever 4 is a block 39 having a tongue 46 which extends rearwardly through a suitable orifice in the driver 5. The lever 4 is yieldingly held in raised position with respect to the arm 3, as illustrated in Fig. 2, by means of a relatively weak hairpin spring 4I. Surmounting the forward end of the lever 4 is a pad 42 providing a hand-rest to adapt the lever to be manually depressed against the action of the spring 4I. Pivotally mounted between the sides of the LI-shaped member I8 on the arm 3 is an element 43 which serves the double function of clogging the staples when the gate 2i) is open and preventing a complete return of the driver 5 until a full driving stroke has been accomplished; this latter device ,i has one end I attached tothe bottoni of the' stapling arm il by means of a screw 52 extending y through the spring and bottom wall of the arm p All* estates is mounted for combined' pivotal and. longitudinal. movement to hold the crossbar of each staple s being driven against the bottom edge of the driver 5. As thus far described the implement is substantially identical with that illustratedv in the Maynard Patent 2,937,334 referred to above.

In` accordance with the present invention, resilient means are provided for holding the forward end of the stapling arm 3 in raised positionA above the base 2 until the lever il'has `been depressed with respect to the arm to penetrate the legs of the staple through the work; the resilient means thereafter yielding to permit the arm to move toward' the base. -As herein illustrated, one suitable means for holding the arm t elevated above the base 2 comprises a leaf-spring 5d attached-to the arm and engageable with the anvil 60 on the base 2. As illustrated in Figs. 1 to Il, thespring 50 is positioned rearwardly of the driverl' and and a nu screwed onto the threaded portion of the screw. The nut 53 is tightened against the bottom wall of the arm 3 iand is held against turning by its engagement with the opposite sidesy of the channel-shaped core i5, see Eig. fi. The spring 5l) extends downwardly and forwardly and has its free end 5t vcurved to adapt it to bear against and slide along the top of the anvil tti on the base'2 rearwardly of the work w. The

f spring 59 of thepresent invention differs from` springs heretofore used for a similar purpose in that it is made of such dimensions or of such material as to have a greater tension than the spring M previously described, whereof to hold the arm 3 in raised position with respect tcthe base t until the driver 5 has been operated to drive a staple s suiciently to penetrateits legs through the work.

The anvil Sii is slidably mounted on the base 2 of the implement to selectively aline one orthe other of twor separate sets of camming grooves Si and 62 with the driver 5. The anvil Sil coni- -prises a flat plate which overlies the top plate 6 at the forward end of the base 2 and is provided with laterally-extending finger-pieces t3 to facilii tomsl of the camming grooves lil are continuously curved from the top face of the anvil at their outer ends inwardly toward `each other and te minate in a common apex (54 at the center, see Fig. 7. The camming grooves 62, on the other hand, areadapted to forni a temporary pin-stitch x byl being arranged in longitudinally-spaced relationship wththeir inner ends spaced apart al being driven the camming grooves lil or 62 of` The bottween the anvil til and the staple-applying mechanism on the arme and the pad i2 at the forthe present inventionact torocl:r the legs of the staplev about axes having a fixed-relation totheir points of joinder with the crossbar ofthe staple without substantially'deforming the legs intermediate their ends. Therefore, by the [term rock as used herein and in the appended claims is meant the swinging movement of the legs about axes which are relatiVelyi-lxecl inrelation to the staple without substantial deformation intermediate the ends of the legs in contradistincti'on to the usual curved clinch caused by a continuons deformation of the legs by the clincher-grooves while the staple is being driven.A

rlhe anvil @il overlies a slot t@ in the top plate t of the base 2 having a narrow bridge tl extending thereacross intermediate its ends, the bridge being of a width corresponding to the space between the two sets of camming grooves lil and h2 in the anvil Eli. The lanvil is provided with depending fianges 68 and GSatits opposite endsl adaptedfto fit closely'betweenthe edges of the slot t5 to Ahold the anvil against `turning on the base, and a depending detent lll onits bottom is adapted to cooperate with the opposite edges of the bridge to retain the anvil in one orthe other of its two operative positions. rTheA anvil ti? is yieldingly held against the top plate il of the hase 2 by means of a spring iii on a stud itdepending from the anvil and projecting `through the slot Sie. The compression spring 'l5 is mounted on the shank of the stud 'M and acts between a head 'it at the lower end of the stud and a washer 'il on the shank to press the latter against the bottom of the top plate 6 of the base 2' at the opposite sides of the slot lili. One form of the invention having nowr been described in detail its mode of operation is explained as follows:

The implement is irst prepared for operation by sliding the gate Eil upwardly and then roel;- ing it on its pivot-pin E5 to open the forward end of themagazine in the arm 3. A supply of staples s, preferably in the form of a stick, is then slid rearwardly onto the core it against the action of the ypusher 23, the's'pring yielding for this purpose. When'released, the staples are held against movement outwardly of the magazine inthe arm by the element #i3 until thegate'Zii is rocked to its closed position to release the element. The staples s are automatically fed forwardly by the pusher 2S under the action of the spring 2li to position the foremost staple in the throat 22. If a temporary pin-stitch is to lbe formed the anvil Si! is slid rearwardly to position the camming grooves il@ in alinement with the driver tand when a permanent stitch is to be made .the anvil is slid forwardly to positionthe vcarnrning grooves 5i. in alinement with the driver.

The vwork w is positioned inv the open-ing beward endvof the lever Il is then depressed. Due

to the resistance of the spring 5d acting between the arm 3 and the base 2, the forward end of thel arm is held in raised position with respect to the base 2 until the :driver 5 has been yoperated. through substantially a complete' driving stroke to drive a staple s" to pierce its legs through the work w in the manner illustrated in Figs.- 2 and`5. Thereafter, continued pressure on the lever ficauses the spring lEl? to yield and the forward end of the arm 3 to move toward the anvil El?. The engagement o-f the ends of the legs of the staple s with the camming grooves 62 then causes them to be rocked` outwardly with respect to the cross- `of its side walls.

bar of the staple without substantial deformation intermediate their ends and the crossbar. This rocking movement of the legs of the staple s continues during the movement of the arm 3 toward the work until the legs are in substantially parallel relation to the crossbar of the staple to forni a pin-stitch in the manner illustrated in Fig. 6. Due to the alinement of the laterallyprojecting legs of the staple substantially with its cross bar the stitch may be easily and quickly removed in the manner of withdrawing a pin without mutilating or tearing the work. When the lever i is released the springs 4| and 50 act to raise the lever and the driver 5 with respect to the arm 3 and to raise the arm with respect to the base.

When a permanent stitch is to be formed the anvil 5U is slid along the base 2 to aline the camgrooves 5| with the driver 5. To slide the anvil 6D the laterally-extending finger-pieces 63 are grasped between the nger and thumb and the anvil drawn forwardly on the base 2. Due to the inclination of the sides of the depending detent l@ the anvil 60 is camined upwardly against the action of the spring 'l5 whereby the detent will ride over the bridge 6l during its forward movement until the depending flange 69 on the anvil engages the end of the slot portion 68. The camming grooves 8| are then alined with the driver 5 and the detent 'lll is engaged with the opposite side of the bridge 6l to yieldingly hold the anvil @-9 in operative position on the base 2. With this last-described adjtment the staple s is driven in the Same manner as explained above, the arm 3 being held in raised position with respect to the base 2 until the staple is driven to penetrate its legs through the work and thereafter moved toward the work to engage the ends of the legs with the camming grooves 6l as illustrated in Fig. 9. Continued movement of the arm 3 with respect to the base 2 causes the legs of the staple to be rocked inwardly toward each other without substantial deformation intermediate their ends and the crossbar to form a flat permanent clinch.

In Figs. 9 and 10, a modified form of construction of the implement is illustrated. In this form of construction the means for yieldingly holding the stapling arm 3 raised with respect to the base 2 comprises a bowed spring 80 attached to the arm 3 forwardly of the driver 5. As illustrated in the present drawings, the spring has one end attached to the front wall 8| of a gate 82 by means of a screw 83 and is bowed outwardly, downwardly and then inwardly so that its free end 84 overlies the anvil 69 forwardly of the driver 5. Projecting rearwardly from the spring 89 is a lug 92 which seats in a suitable recess in the front wall 8| of the gate 82 to hold the spring from turning about the axis of the screw 93. The gate 82 is similar to the gate 29 illustrated in Figs. l to 3 but has the lower rearward edges 85 of' its side walls 8E shaped to engage abutments 8T struck outwardly from the flanges I8 on the arm 3. The gate 82 is prevented from being moved upwardly by the pressure of the spring 88 by its pivot-pin 88 being mounted in closely f1tting circular bearing apertures 89 in the side walls of the member I8 instead of in oval slots as illustrated in Figs. 1 to 3. The gate 82 is held in closed position on the arm 8 with the lower rearward edges of its side walls S6 in engagement with the abutments 31 by means of the spring 2l which bears on the flat, upper edges 98 Thus, the gate 82 is yieldingly held in closed position on the arm 3 and prevented from upward movement but is adapted to pivot in the usual manner to open the magazine, the spring 2l yielding for this purpose and engaging the forward edges 9| of the side walls of the gate to hold it open.

The implement illustrated in Figs. 9 and 10 is operated in the same way as explained with respect to the implement illustrated in Figs. l to 3. When pressure is applied on the pad 42 the arm 3 is held in raised position with respect to the base 2 by the engagement of the free end 84 of the bowed spring 88 with the work 'w on the anvil 60 at a point forwardly of the driver 5 until the latter has been actuated to drive a staple to penetrate its legs through the work. The bowed spring 80 thereafter yields to permit the arm 3 to move toward the base to cause the projecting legs of the staples to be rocked into parallel relationship to its crossbar by the camming grooves 6| or G2 in the anvil 60. The spring 80 also has the added function of holding the work in place on the anvil during the driving and setting of the staple.

In Fig. 1l another modied form of construction of the implement is illustrated. In this form of construction a plunger is mounted on the arm 3 forwardly of the driver 5. The gate 98 in this embodiment is similar to that illustrated in Figs. 9 and 10 except that its front wall Sl has brackets 98 and 9S struck outwardly therefrom and apertured to receive the plunger 95. As herein illustrated, the plunger 95 has a portion |09 projecting downwardly through the aperture in the bracket 99, an annular collar |0| adapted to seat against the upper face of the bracket 99 and a reduced shank |82 which projects upwardly through the aperture in the bracket 98. A helical spring |03 is coiled around the shank |02 and acts between the bracket 98 and the annular collar ||l| on the plunger 95 to hold the collar seated against the upper face of the bracket 99.

The plunger 95 acts in the same manner as the bowed spring 80 to hold the arm 3 raised with respect to the base 2 until the driver 5 has been actuated to drive a staple to penetrate its legs through the Work. The spring |03 then yields to permit the arm 3 to move downwardly with respect to the plunger 95 toward the base 2 to engage the ends of the legs of the staple with the camming grooves 6| or 52 to cause them to be rocked into parallel relation to the crossbar of the staple. The plunger 95 has the same supplementary function as the spring 80 to hold the` Work in position on the anvil 6l).

It will be observed from the foregoing that the present invention provides a construction and arrangement of elements wherein the spring for holding the arm raised with respect to the base is more resistant than the spring for holding the driver in raised position on the arm whereby a staple may be driven to penetrate its legs through the work before the legs are clinched. It will also be observed that the spring may be carried by the arm and positioned either forwardly or rearwardly of the driver.

While the device is herein illustrated as embodied in several preferred forms of construction it is to be understood that modifications may be made in the structure and arrangement of its parts without departing from the spirit or scope of the invention. Therefore, without limiting ourselves in this respect, we claim:

1. In a device of the type indicated, an anvil adapted to support the work directly thereon, fastener-applying means mounted for movement toward and away from the anvil, a driver carried by the fastener-applying means, a spring for holding the driver in raised position with respect to the fastener-applying means, a second spring carried by the fastener-applying means and having greater resistance than the first-,mentioned spring, said second-mentioned spring acting on the anvil Ato hold the. fastener-applyingvmeans raised with respect to the workA until the driver has been actuated to drive a fastener to penetrate the ends of its legs through the work and thereafter yielding to permit the fastener-applying means to move toward the anvil.

2. In a device of the type indicated, `an anvil adapted to support the work directly thereon, an arm mounted for movement toward and away from the anvil, a driver on the arm for applying staples fed thereto, a spring for holding the driver in Vraised position on the arm, a second spring of greater resistance than the first-mentioned spring acting on the arm forwardly of the driver, said second-mentioned spring operating to hold the arm raised with respect to the work on the anvil until the driver' has been actuated to drive a staple to penetrate the ends of its legs through the work and thereafter yielding to permit the arm to move toward the anvil.

3. In a device ofthe type indicated, a base adapted to support the Work directly thereon, an arm mounted on the base for movement toward and-away from the latter, a driver on the arm for applying staples fed thereto, a spring for holding the driver in raised position on the arm,

and yieldable means of greater resistance thanl the spring, said means mounted on the arm forwardly of the driver and operating to hold the arm raised with respect to the work on the base until the driver has been actuated to drive a staple to penetrate the ends of its legs through the work and thereafter yielding to permit the arm to move toward the base.

4. In a device of the type indicated, a base adapted to support the work vdirectly thereon, an arm mounted on the base for movement toward and away from the latter, a driver on the arm for applying staples fed thereto, a spring for holding the driver in raised position on the arm, and a bowed spring of greater resistance than the` rstmentioned spring and mounted on the arm forwardly of the driver, said spring acting against the base to hold the arm raised with respect to the Work on'the base until the driver has been actuated to drive a staple tovpenetrate the ends oi its legs through the Work and thereafter yielding to permit the arm. to move toward the base.

`5. In a device of the type indicated, a base adapted'to rsupport the work directly thereon, an arm mounted on the base for movement to- Ward and away from the latter, a driver on the arm for-applying staples fed thereto, a spring for holding the driver in raised position on the arm, a plunger mounted on thearm'forwardly of the driver, a spring of greater resistance than the first-mentioned spring acting on the plunger, said spring-actuated plunger operating to hold the armA raised With respect `to the work on the a staple to penetrate the ends of its legs through the Work and thereafter yielding to permit the u arm to move toward the base.

arm raised with respect to the work on the base' until a staple has been driven to penetrate the ends of its legs through the work, and camming means on said base, said camming means being engaged bythe ends of the projecting legs of the staple to rock them into parallel relation to the crossbar of' the staple Without substantial deformation intermediate their ends.

ARTHUR H. MAYNARD.. JOSEPH M. GAMBAO.

base until the driver has been actuated to drive

Images