US2268102A - Staple feed mechanism for fastener applying instruments - Google Patents

Description

30,1941. y QATTULA 2,268,102

STAPLE FEED MECHANSM FOR FASTENER APPLYING INSTRUMENTS v Filed May s1, 1941 INVENTOR OTTO ATT ULA ATTORNEYS Patented Dec. 30,1941

UNITED STATE STABLE zasaioz FEED MECHANISM FOR FASTENER v APPLYING INSTRUMENTS om. anula, Woodside N. Y., assigner to Lou Obstfeld, Brooklyn, N. Y., and Abraham Obstfeld, New York, N. Y.

Application May 31, 1941, serial No. 395,383.

13 Claims.

This invention relates to fastener applying instruments of the magazine type, and-,more

.particularly to the feed mechanism for such4 and the feed mechanism is accordingly made removable. It comprises a staple pusher, a rod slidably receiving the pusher, a feed spring coiled about the rod, and a pusher locked affixed to the rear end of the rod. One object of the present invention isto improve the pusher lock 4and to make the same openly accessible and readily releasable. Another object is to facilitate loading the machine with staples, and for this purpose the staple core may be projected beyond the rear end of the frame of the machine, the projecting end'preferably being housed and concealed by the aforesaid pusher lock. Still another object is to facilitate replacement of the feed mechanism by preventing rotation of the pusher and the pusher lock relative to the aforesaid rod, the pusher being keyed to the The fastener applying instrument is of the rear-loading type,

Fig. 6 illustrates the keyways on the pusher for receiving the keyed end `of the rod;

Fig. 7 is a plan view of the keyed end of the rod; Y 4

Fig. 8 is a side elevation of the keyed end of the rod;

Fig. 9 is a transverse section through the staple magazine with `the feed mechanism removed;

Fig. 10 is a plan view of the rear end of the fastener applying instrument, corresponding substantially to the part of the machine shown in Fig. 2; and

Fig. 11 is a partial section through the rear end portion of a machine having a modified pusher lock. l

Referring to the drawing, and more particularly to Fig. 1, the complete fastener applying rod by tapered or wedge-shaped keys which v .insure automatic engagement of the parts in keyed relation.

To the accomplishmentof the foregoing and such other objects as will hereinafter appear, my invention consists in the elements of the fastener applying instrument and their relation one to the other, as hereinafter are more particularly described in the specification and sought to be defined in the claims. is accompanied by a drawing, in which:

Fig. 1 is a section taken in elevation through a fastener applying instrument embodying features of my invention, (the upwardly turned edges of the sides' of the machine being crosshatchedfcr clarity, as though the section were somewhat 0E true center line);

Fig. 2 shows the rear end portion of the machine in elevation;

Fig. 3 is a horizontal section taken in the plane of the line 3-3 of Fig. 2;

Fig. 4 is a similar view (with only part of the pusher lock broken away) ,but showing how the sides of the pusher may be pressed together to release the detents;

Fig. 5 is a side elevation showing replacement of the staple pusher after loading the machine with staples:

The specification instrument comprises a frame I2, part of which constitutes a grip i4. The frame consists of sides having edges bent toward one another to forma structure which is enclosed except at the bottom, where appropriate staple magazine parts areinserted; and at the forward and rear ends l of the staple magazine, the latter being readily openable for rear loading of staples, and the forward end being openable for servicing and for the relief of staple jams. In the present case, the .fastener applying instrument is a tacker, and no anvil or staple clincher is prof vided.

. The machine is operated by means of a handle I6 pivotedat I8, and carrying a pawl `2l). The staples are driven by a staple driving blade 22 secured .to a plunger 24 urged downwardly by a main drive spring 26. Leather inserts 28 and 28 may, if' desired, be provided at the top of spring 26 andbeneath plunger 24. When handle I6 `is depressed, the spring 26 is compressed until pawl 20 reaches and bears against a pawl release pin 30 which moves the pawl rearwardly and so releases the plunger for descent, at which time it drives the -endmost one of a bar of staples 32 out of the machine. When handle i6 is released, it'is raised by a'restoring spring 3l, and the upward motion may be limited by a stop 36 secured to and forming a part of handle i6. I

The staple magazine comprises a staple core 38 which is dimensioned to slidably receive the staples. The rear end 40 of the staple core projects beyond the open rear end 42 of the frame, and is preferably tapered as shown, in order to facilitate the staple-loading operation. The staple core 38 is properly spaced from the sides to be received within the sides of the frame, and

my invention in several preferred forms, changes and modifications may be made in the structures disclosed, without departing from the spirit of the invention as sought to be defined in the following claims.

I claim:

1. Staple feed mechanism for a magazine type mating detent means formed on the sides of the of fastener applying mechanism having side walls.

said mechanism including y a staple pusher, a pusher spring, and a pusher lock at the rear end of said spring, said lock comprising -side walls which partially overlap the sidewalls of the instrument, and mating detent means formed -on said overlapping side walls, the arrangement being such that the lock may be secured in position by simply pushing it into place, and may be removed by pressing the exposed sides of the lock together in order to release the mating detent means.

2. Staple feed mechanism for a magazine type of fastener applying instrument having side walls, said mechanism including a staple pusher, a pusher spring, and a` pusher lock at-the rear end of said spring, said lock comprising side walls which are received partially within the side walls of the instrument, and mating detent means formed on said overlapping side walls, the arrangement being such that the lock may be secured in position by simply pushing it into place, and may lbe removed by pressing the exposed sides of the lock together in order to release the mating detent means.

3. Staple feed mechanism for a magazine type of fastener applying instrument having side walls, said mechanism including a staple pusher. a rod slidably receiving said pusher, a pusher' spring coiled about said rod, and a pusher lock at the rear end of said rod, said lock comprising an end wall to which the rod is secured and side walls bent forwardly from and formed integrally with said end wall, said side walls being received partially within the side walls of the instrument, and mating detent means formed on the overlapping side walls, the arrangement being such lthat the lock lmay be secured in position by simply pushing it into place, and .may be removed by. pressing the exposed sides of thelock together in order to release the mating detent means. f

4. Staple feed mechanism for a magazine type of fastener applying instrument having side walls, said mechanism including a staple pusher, a rod slidably receiving said pusher, a pusher spring coiled about said rod, and a pusher lock at the rear end of said rod, said lock comprising an end wall to which the rod is secured and sideA walls bent forwardly from and formed integrally with said end wall, detents formed on said side walls and dimensioned to be received within the adjacent side walls of the instrument, said instrument walls having mating recesses toreceive said detents, the arrangement being such that the lock may be secured in position by simply pushing it into place, and may be removed by pressing the exposed sides of the lock together in order to release the detents from the recesses. i

5. In a fastener applying instrument comprising a frame including side walls open at the rear end, a feed mechanism including a staple pusher, a feed spring, and a pusher lock mounted at the rear end of said spring, said pusher lock comprising a piece of sheet metal bent to form a housing open at the forward end and dimensioned to close the lopen rear end of the frame, tabs projecting forwardly from the sides of the housing frame and tabs for holding the parts together,

said detent means being releasable by pressing open at the forward end and dimensioned to close the open rear end oi the frame, the sides of said housing being pressed outwardly to form buttons which facilitate squeezing the sides of the housing together, tabs' projecting forwardly from the sides of the housing to be received within the formed on the sides of the frame and tabs for holding the parts together, saidl detent means being releasable by pressing together thesides of the housing. Y

7. In a fastener applying instrument comprising a frame including side walls open at the rear end, a feed mechanism including a staple pusher, a rod slidably receiving saidpusher, a feed spring coiled about said rod, and a pusher lock mounted at the rear end of said rod, said pusher lock comprising a piece of sheet metal `bent to form a housing which is closed at the rear end and open at the forward end and dimensioned to close the open rear end of the frame, said rod being secured to the closed rear end` of the housing, the sides of the housing being dimensioned to be received partially within the sides of the frame, and mating detent means vformed -on the overlapping sides of the frame and tabs for holding the parts together, said detent means being releasable by pressing together the exposed sides of the housing.

8. In a fastener applying instrument'comprising a frame including side walls open at the rear end; a staple core disposed in said fastener andhaving a. rear end which projects beyond the sides of the fastener to facilitate the loading of staples. in the machine, a feed mechanism including a staple pusher, a rod slidably receiving said pusher, a feed spring coiled about said rod, and a pusher lock mounted at the rear end of said rod, said pusher lock comprising apiece of sheet metal bent to form a housing open at the forward end and dimensioned to be received over and to enclose the exposed rear end of the staple core, the sides of the housing being dimensioned to be received partially within the sides of the frame, and mating detent means formed on the overlapping sides of the frame and housing for 'said pusher, a feed spring coiled about said rod,

and a pusher lock mounted at the rear end of said rod, said pusher lock comprising a piece of sheet metal bent to form a housing open at the forward end and dimensioned to be received over and to enclose the exposed rear end of the staple core, the sides of said housing being pressed outwardly to form buttons which facilitate squeezing d: l acceden er, a feed spring coiled about said rod for urging the pusher forwardly, and means to x the pusher against rotation on the rod whenthc pusher is removed from the instrument, said means including keyways formed on the pusher and keys formed at the end of the rod, said keys being tapered or Wedge-shaped with the large end of the wedge toward the forward end of the rod and the pointed end of the vWedge toward theV rear end of the rod, whereby said keys readily move into said keyways, yet said pusher cannot leave the rod entirely..

11. Staple feed mechanism for a fastener applying instrument, said mechanism comprising a pusher, a round rod slidably receiving said pusher,` a feed spring coiled about said rod for urging the pusher forwardly against the staples. a pusher lock non-rotatably secured to the rear end or' said rod, and means to x the pusher against rotation on the rod when the pusher is removed from the instrument, said means including keyways formed on the pusher andkeys formed at the end of. the rod, andA said keys being tapered or wedge-shaped with the large end of the Wedge toward the forward end of the rod and the pointed end of the Wedge toward the rear end of the rod, whereby said keys 4readily move into said keyways, yet saidv pusher cannotleave the rod entirely. i l

12. in a fastener applying instrument comprising a frame which is vopen at the rear end, a feed mechanism including a staple pusher, a .feed spring, and a pusher lock at the rear end of Saidv spring, said pusher lock comprising a piece of sheet metal bent to form a housing open at the forward end and dimensioned to close the open rear end of the frame, a wall of said housing projecting forwardly to overlap a wall of the frame, and mating detent means formed on the overlapping parts of the frame and housing walls for holding the pusher lock a`nd the frame together, said detent means being releasable by pressing an exposed part of the housing wall.

13. In a fastener applying instrument comprising a frame which is open at the rear end, a feed mechanism including a staple pusher, a 'feed spring, and a pusher lock at the rear end of said spring, said pusher lock comprising a piece of sheet metal bent to form a housing open at the forward end and dimensioned to close the open rear end of the frame,l a wall of said housing projecting forwardly to be received within a wall of the frame, the exposed part of said housing wail being pressed outwardly to form a convex button to facilitate squeezing. the housing wall away from the frame wall, and mating detent means formed on the overlapping parts of the frame and housing walls for holding the pusher lock and the frame together, said detent means being releasable by pressing the aforesaid button.

OTTO ATTULA.

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