US1994147A - Staple driving machine - Google Patents

Description

F. POLZER STAPLE DRIVING MACHINE -March 12 1935.

Filed April 9 1932 Patented Mar. 12, 1 935 UNlTED STATES STAPLE DRIVING MACHINE Fridolin Polzer, South Norwalk, Conn., assignor to The E. H. Hotchkiss Company, Norwalk, Conn., a corporation of Connecticut Application April 9, 1932, Serial No. 604,193

a g 9 Claims.

This invention relates to new and useful improvements in staple driving machines.

An object of the invention is to provide a stapledriving plunger may be easily released should it bind in the raceway. 1

Other objects and advantages willgbecome apparent from a consideration of thefollowing detailed description taken in connection; with the accompanying drawing wherein is shown a satisfactory embodiment of the invention. However, it will be understood that this disclosure is for the purpose of making clear the principles of the invention and that the inventionis not limited to the details shown but includes all such modifications and variations as fall within the scope of the appended claims.

In the drawing: V

Fig. 1 is a side elevational View of the forward portion of a staple driving machine in accordance with the invention; p a

Fig. 2 is afront elevational view thereof;

Fig. 3 is a vertical sectional view through the forward portion of the machine;

Fig. 4 is a similar viewof thelower forward portion of the machine showing a staple strip in place therein; and v Fig. 5 is a detail sectional view substantially along the line 5-5 of Fig. 3.

Referring in detail to the drawing, at 6 is shown a portion of the housing of a staple driving ma chine which machine may be either a stapling machine or a tacking machine. The housing 6 may include a forward portion or head '7 and a rearwardly extending hollow portion 8 forming a handle. A plunger 9 is operable in the head '7 of the machine and at its-upper end the plunger carries a head 10 while its lower or inner end is hollow as at 11 to receive a portion of a coil spring 12 which coil spring'normally serves to maintain the plunger in its elevated or outermost position. This coil spring also operates to return the plunger to normal position when it is moved from such position in the operation of driving a staple.

Movement of the plunger is limited as by a pin 13 supported in the head 7 and disposed in a slot 14 in the plunger. Obviously, movement of the plunger is limited by engagementof either of the closed ends of the. slot 14 with the pin 13. On its forward face the plunger 9 carries a steel plate 15 forming the staple driving-part of the plunger and this plate operates in a raceway 16 as will be understood. The lower portion'of the housing 6 may be closed as by a staple strip guide bar 17 at its inner or forward end forming one side of the raceway 16 and this guide bar 17 is adapted to have the staple strip 18 mounted thereon andthe strip is fed forwardly along the guide bar to the raceway 16 as by a follower 19. Any spring means may beprovided for urging the follower along the guide bar and as here shown a'coil spring 20 is connected at one end with the follower 19 as by a screw 21 and this spring is passed over pulleys or idlers 22 and anchored within the handle 8.

As abovestated the inner or forward end. of the guide bar 17 forms one side of the raceway l6 and the other side of this raceway is formed by a block 23 having extensions 24 straddling the raceway and at their inner ends pivotally connected to the housing, as to a portion of the guide bar '17, by a pin 25. It will thus be seen that while the pivotal mounting for the block 23 is located at the inner side of the raceway 16 the block itself when in normal position forms the outer side of the raceway. The block in Figs. 1 through 4 is shown in full lines in its normal position and the block is adapted to swing on the pin 25 into the open position in which it is shown by dot and dash'lines in Fig. 1. As here disclosed the block 23 carries a pivotally mounted dog or finger 26 adapted to prevent a second staple of the strip 18 entering the raceway 16 until the first staple to enter the raceway has been driven therefrom. This dog orifinger 26 is fully disclosed and claimed in my Patent Number 1,829,537, patented October 27, 1931.

According to the present invention, means are provided'for yieldingly securing the block 23 in its normal position in which position it forms one side of the raceway 26. Said means as herein disclosed includes a lever 27 pivoted intermediate its ends tothe head 7 of the machine as by means of a pin 28 passing through the end portions of the arms of a substantially U-shaped clip 29 secured to the lever as by the rivets 30. If desired, a recess 31 may be cut in the forward face of the head? of the housing, the said recess receiving the pivotally mounted end portions of the arms ofthe clip 29 whereby the lever 27 may bedisposed close to the housing so as not to detract from the appearance of the machine.

The lever 27 is so arranged that its lower end portion 32 is adapted to overlap the upper edge portion of the block 23 when the parts are in their normal positions and if desired the upper edge portion of the block may be notched as at 33 to receive the lowerend portion of the lever. The upper end portion 34 of the lever is offeset with respect to the end portion 32 thereof and arranged between the upper end portion 34 of the lever and the forward or adjacent face of the head '7 of the housing is a coil spring 35. Thissp-rin'g has its respective end portions anchored to the lever and the housing as by entering recessesin the lever and housing as shown. Obviously, the spring normally urges the portion 34 of the lever in a direction away from the housing with the re= sult that the lower end portion 32 of the lever is pressed against the block 23 yieldingly securing it in its normal position.

In the normal operation of the suming a staple strip 18 to be in place on the guide bar, the follower 19 will be operated to feed the s'trip along thebar and dispose the foremost staple of the strip in the raceway l6. 5 The head 10 of'the plunger may now be struck'or pressed in a' direction against the action of spring -12 causing the steel plate 15 to nove' downwardly through the raceway and drive the staple therethrough. On the plunger being released the spring 12 will normally returnitto its upper or outermost position ready for the next operation. 'If it should happen that the steel plate or staple driving part 15 of the plunger binds inthe raceway because "of lateral pressure caused'by a staple jammed in the raceway and the spring 12 is not strong enough to return it to normal position, owing to the fact that the block--23 is yieldingly held in normal position forming one side of th'e raceway this block may yield mmove slightly toward open position on the lateral pres sure becoming excessive and thereby prevent damage to the machine.

Should the staple driving plate or part 1-5 bind in the raceway itis obvious that it may be more easily released when the "side of the raceway yields laterally than would be the case if the side of the raceway were rigid and immovable with'respec't to the housing. Of 'eourse, the pressure exerted on the block 23 by the le'verf27 must be considerably greater than the normal lateral pressure due'to the feeding 'of the "staple strip by the follower I9 and the lateral pressure developed in the normal or ordinary operation of driving a staple through "the raceway. However, when the lateral pressure is sufiicient to bind the plunger the pivoted block 23 will-yield without binding the plunger in such 'a manneras to injure the mechanism and the plunger will not be held so tightly but that it is easily released.

I Additionally, if the pressure of the lever 27 on the block 23 is relieved somewhat as by pressing the upper end portion 34 of the lever inwardly with the hand against the actionof the spring Bdtheplunger will berelease'd and moved back to normal positionby the plunger spring 12, In machines wherein the sides of the raceway are rigidshoulda'staple wedge in the raceway then somepart of' the machine would lik'elybe 'broken under theforceof the blow whenthe plungerhad been driven"down'wardly as by amallet. "Orthe plunger and the 'staple would be" so tightly 'J'ammed in'the raceway-that "it wouid e difiicult to free them. with'thepresentdevicethe block machine, "as- .rp s.

23 or the front of the raceway yields and no damthe raceway and when the staple has been forced out the block is immediately returned to normalposition. Should the lateral pressure be very great the block willibe forced out sufficientlyto pass from under the lower portion of the lever and move to wide open position as shown by the dot and dashlines in Fig. 1., I v

The staple driving machine of the present invention may be loaded from the front by pressing inwardly on the upper portion of the lever 27 soas to shift the lever to the position in which it isshown by dot and dash lines infFig. 1. This will permitthe block 23 to be swung to' open position exposing the forward end of the staple strip guide bar 17 over which the new staple strip may be 'passe'd as will be understood; "On

the new staple-strip'being placed in position the block or gate '23 may be returned to normal" po siti'on -an'd secured by the lever 27. Having thus set forth thenature 'ofmy -inven-' tion, what I claim-is: -1. In a staple driving machine, a housing having a raceway therein, means for feeding staples to said raceway, a plunger operable to drive sta-' ples through said raceway, a block pivoted to said;

housingnormally forming one side of said race way and adapted to move laterally therefrom means yieldi'n'gly tending to turn the'block on its pivot to secure said block in normal position;

and manually manipulatable 'rneans for shifting said block se'eu'ring means to relieve the pressurewithwhich it engages the block;

2. In astaple'drivi-ng machine, a housing -having araceway therein,- fnea'nsfor feeding staples to said raceway, a plunger operable to drive sta pies through said raceway, a block including "an.

extension pivoted to the lower portion of the housing atone side of the raceway; said bloek:

having a normn 'po'sition forming -the o posite side of said raceway-and*extending abovesaid extension, and means engaging said'blockabove said 'p'ivoted extension and 'yielding'ly securing said block 111 normal position 3. In a staple drivingmachihega housing hav a ing a raceway therein; 'means for feeding staples to said raceway, Ineansfoperable-to drive'staples through said raceway,-a *block' pivoted fto' 'sa'id housing and when in normal position forming one side of said raceway, a spring pressed'lever pivoted to said housing, and said lever engaging Said block and y-i'eldiiigly retaining it in normal position. v V j j 4. In' a staple driving machinefa housinghav inga raceway thereinjme'an's for-feeding staples to said raceway; means operable to drivestalples through said racewayya block-pivoted to-sfaid I housing and when in normal fDos'ition'fo'r'mingfone side of "said' raceway, 'a lever'pivoted intermediate its ends to said-housing; and "a sp ng means normally urging one end portion of the lever .in a

direction away from the housing "and the" other end portion of the lever against said block where'- by the blockis yieldingly held in normal position.

5. In a staple driving machine, ahlousin'ghaiva aewawe a for ed eri s to said raceway, rne'ans operable "todrive' staples through Said racew'ay, ablock pivoted tb ezild housing and when in normal position rz'ir'mihg one side of saidraceway, a lever pivoted to 'said housing, a sprmg means ndrmauy urgmg cne end portion of said lever in a direction away from said housing, said spring means urging the other end portion of the lever against said block whereby the block is yieldingly held in normal position, and said lever adapted to be moved about its pivot against the action of said spring means to permit said block to swing to an open position.

6. In a staple driving machine, a housing having a raceway therein, means for feeding staples to said raceway, means operable to drive staples through said raceway, a block pivoted at its lower end to said housing and when in normal position forming one side of said raceway, a spring pressed lever pivoted to said housing, and said lever including a portion engaging the upper portion of said block and yieldingly retaining it in normal position.

7. In a staple driving machine, a housing having a raceway therein, means for feeding staples to said raceway, means operable to drive staples through said raceway, a block hingedly connected at its lower end to said housing and when in normal position forming one side of said raceway, a lever pivoted intermediate its ends to said housing, and a spring means normally urging one end portion of the lever in a direction away from the housing and the other end portion of the lever against said block whereby the block is yieldingly held in normal position.

8. In a staple driving machine, a housing having a raceway therein, means for feeding staples to said raceway, means operable to drive staples through said raceway, a block hingedly connected at its lower end to said housing and when in normal position forming one side of said raceway, a lever pivoted to said housing, a spring means normally urging one end portion of said lever in a direction away from the housing,' said spring means urging the other end portion of the lever against said block whereby the block is yieldingly held in normal position, and said lever adapted to be moved about its pivot against the action of said spring means to permit said block to swing to an open position.

9. In a staple driving machine, a housing having a raceway therein, means for feeding staples to said raceway, means operable to drive staples through said raceway, a block including an extension pivoted to the lower portion of the housing at one side of a raceway, said block having a normal position forming the other side of said raceway, a spring pressed lever pivoted to said housing, and said lever including a portion engaging said block and yieldingly retaining it in normal position.

FRIDOLIN POLZER.

Images