US2351043A - Stapling machine - Google Patents

Description

June 13, 1944. H. SHELLER STAPLING MACHINE Filed Jun 25, 1942 iNVENTOR m Ma Q E. E m HMO s. T mum O HS 5 n m In 4 .6 F

Patented June 13, 1944 UNITED STATES PATENT orm STAPLING MACHINE Harold S. Heller, Cleveland Heights, Ohio Application June 25, 1942, Serial No. 448,358;

4 Claims.

This invention relates to staple driving machines, and more particularly to those which employ U-form wire staples, from the crown of which a portion is removed, so that the staple legs are driven and serve after the manner of small brads, tacks or nails.

One object of the invention is to provide an improvedmachine of this kind particularly designed for use with a U-form staple having its crown'weakened in such manner that the machine itself, during the normal operation of driving the staple into the work, and without the use of extra staple shearing, cutting or deform.- ing parts, accomplishes not only the driving of the two spaced staple legs but alsoremoval of the excess metal of the crown between them.

A further object is to provide an improved stapling machine, the driving tool of which applies driving impact to a staple only at the upper ends of its legs, while the cross connecting crown piece maintains the legs in correct driving position, enabling them accurately to be driven endwise into the work, but finally leaving behind them the crown portion of the staple by severing it along weakened lines near to but spaced from the legs, to provide a head for each leg.

A further object is to provide an improved machine of this kind which is of simple construction; which may be used efficiently with standard staples as an ordinary tool; and which, when used With'weakened wire staples, converts them in effect into headed brads and drives them to a depth sufiicient to bu y or countersink their heads in the work.

Further objects of the invention are in part obvious and in part will appear more in detail hereinafter.

. -In the drawing, which represents one suitable embodiment of the invention, Fig. 1 is a side elevation;

Fig. 2 is a detail sectional elevation on approximately the line 2-2, Fig. 1, looking in the direction of the arrows, and showing the driving tool ready to engage a staple for driving the same;

i Fig. 3 is a similar view showing the staple partly driven; v

Fig. .l is a similar view, showing the parts in their positions just before the shearing. opera tion begins; 1

Fig. 5 is a similar view, but illustrating only the work andstaple, with the parts in their final positions;

Fig, 6 is a detail sectional plan view on the line B t-F1813? Fig. 7 is a perspective view, on a larger scale, illustrating one form of staple which may be used;

Fig. 8 is a similar view of another form of staple; and

Fig. 9 is a plan view of the finished work.

The invention now to be described is an improvement upon that shown, described and claimed in my prior application for Stapling machine, filed Decemberv 8, 1941, Serial No. 422,077, to which reference may be had if desirable or necessary. In said application the stapling machine operates upon standard U-form wire staples, being provided with a shearing anvil which cooperates with the driving tool to shear away a portion of the staple crown just before the heads of the remaining brad form staple legs are countersunk into the work.

According to the present invention, a special form of U-form staple is employed, made of a piece of wire of uniform cross section, having its crown portion cut, indented or otherwise weakened at two points near to but spaced from the legs in such manner that the end shoulders of the two arms of the staple driving tool come near to or register with said weakened portions and accomplish severance of the wire when the staple crown engages the face of the work. This reduces wear and tear on the machine parts, relieves them of some duty,-dispenses with an extra anvil part, and nevertheless accomplishes the task efllciently and satisfactorily.

'The operating parts of the stapling machine, I

for the purpose. As shown, they comprise a hollow body or frame I, within which the operating parts are housed or enclosed. The staple drivingtool 2 moves in a channel or guideway 3, being-operated by pressure or impact of the hand upon the head 4 of .a plunger 5 biased upwardly by the usual compression spring 6. Staples are'fed one by one to said channel ahead of the driving tool, said'staples being advanced along a track orguideway I by a follower 8, as

is usual.

Any suitable form of staple may be employed. The drawing shows a staple ll! of generally U- form made from'a long length of wire of uniform rectangular cross section bent at two points Illa to form parallel legs ll connected by a cross bridge or crown member l2; the arrangement p esenting curved surfaces of the metal upward to said channel, and a driving tool movable in said channel and having its leading edge portion recessed between its ends to provide two driving arms, one on either side of the recess, and having depending projections at the outer ends of said arms, to thereby conform the arms to the heads, the tool recess forming two edge portions located so as to engage the staple near to its weakened portions, whereby the staple crown at its ends is embraced by and held between said projections during the driving operation and the heads are severed from the crown when it engages the work and both the legs and heads may be driven into the work without distortion at the bend between them.

2. A stapling machine for use with U-form staples having the crown portion weakened at two points near to but spaced from the legs to provide a head for each leg, comprising a frame provided with a staple guiding channel having an open mouth adapted to be applied to the work, an operating plunger, a tool operated thereby and slidable back and forth in said channel, said channel being open and unobstructed across its full area from the driving end of the tool to said mouth, and mean for supplying staples one by one to said channel to a point in advance of the driving tool when the latter is in retracted position, said driving tool being provided with two arms spaced apart on opposite sides of a recess and having edge portions located so as to engage the staple crown near to its weakened portions, to there sever the legs from the crown when it engages the work and drive the legs and their heads into the work.

3. A stapling machine for use with U-form staples, comprising a frame provided with a staple guiding channel having an open mouth adapted to be applied to the work, an operating plunger, a tool operated thereby and slidable back and forth in said channel, said channel being open and unobstructed across its full area from the driving end of the tool to said mouth, and means for supplying staples one by one to said channe1 to a point in advance of the driving tool when the latter is in retracted position, that portion of the machine frame adjacent the channel mouth which engages the work having a shouldered groove extending parallel to the length of the said channel mouth with the shoulder of said groove parallel to and at one side of the crown of a staple being driven, to accurately locate the staple legs with reference to the shoulder of said groove and to space them apart lengthwise of the work.

4. A stapling machine for use with U-form staples having the crown portion weakened at two points near to but spaced from the legs to provide a head for each leg, comprising a frame provided with a staple guiding channel having an open mouth adapted to be applied to the work, an operating plunger, a tool operated thereby and slidable back and forth in said channel, said channel being open and unobstructed across its full area from the driving end of the tool to said mouth, and means for supplying staples one by one to said channel to a point in advance of the driving tool when the latter is in retracted position, said driving tool being provided with two arm spaced apart on opposite sides of a recess and having inner edge portions located so as to engage the staple crown near to its weakened portions, that portion of the machine frame adjacent the channel mouth which engages the work having a shouldered groove extending parallel to the length of the said channel mouth with the shoulder of said groove parallel to and offset from the length of the crown of a staple being driven, to thereby sever the legs from the crown when it engages the work and drive the legs and their heads into the work at two points accurately spaced from the shoulder of said groove and spaced apart lengthwise of the work.

HAROLD S. HELLER.

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