US2033599A - Stapling device - Google Patents

Description

M. VOGEL STAPLING DEVICE Filed March 28, 1934 INVENTOR. Max VEJEEL A TTORNEYZ Patented Mar. 10, 1936 SA'iES ATENT OFFICE Application March 28,

1934, Serial No. 717,690

In Germany October 12, 1933 1 Claim.

The present invention relates to a stapling device of the type adapted for clinching paper fastening staples, the legs of which penetrate the paper and are bent back to form extensions of the bridge portion of the staple. This invention is applicable to stapling devices of the well known desk or plier type, which bends back the legs of the staples and extends them in an outward direction of the bridge portion, and has for an object to make possible the sharp bending of the legs of the staples, and extending them so that the clinched staple is tightly fastened without danger of accidental looseness of the staple, but which on the other hand allows the staple to be easily withdrawn without damage, and again replaced.

To accomplish this, the device, which in the usual manner employs an ejector or driver in one jaw and an anvil in the opposite jaw or underpart, is provided with a protruding pin, working against spring pressure, and normally projecting up from the anvil or under jaw, in

the center of the clinching platform.

By means of the arrangement of this pin, the papers which are about to be stapled will be clamped between the staple guide head and the pin by the downward motion of the guide head at the beginning of the stapling stroke, so that the staple legs will be forced through the paper by the following motion of the ejector driver without being curled up on the anvil. As soon as the bridge portion of the staple engages the paper, which in turn rests upon the pin, and the staple legs have fully penetrated the paper, any further motion of the guide head forces the pin downwardly in its guide passage on the anvil and the staple legs are bent outward by the anvil. During the time the staple legs are being bent, the bridge portion of the staple remains clamped between the pin and the guide head and cannot bend.

By means of my improvements, a sharp bend in the staple legs is obtained, with the legs fully extended outwardly from the bridge portion. The clinched staple is securely fastened in the paper, but can be withdrawn or replaced without damage to the paper.

The invention is illustrated in the drawing, which shows as an example a desk type pliershaped stapler.

In the drawing:

Fig. 1 shows a side view of the pliers.

Fig. 2 shows a plan of the anvil, on the line II--II of Fig. 1.

Fig. 3 is a partial sectional view through the lines IIIIII of Fig. 1, and showing the first step in the stapling operation, where the material to be stapled is gripped within the mouth of the stapling plier.

Fig. 4 is a similar view showing the second step in the stapling operation, where the legs of the staple have penetrated the material to be stapled.

Fig. 5 is a similar view showing the third step in the stapling operation, where the legs of the staple are bent outwardly.

Fig. 6 is a similar view showing the stapled material upon release of pressure.

Fig. 7 shows the stapled paper at the finish of the stapling operation.

The stapling pliers include the usual housing I with an integral gripportion 2 and backingplate or lower jaw 4, the latter carrying the anvil 3. The upper jaw is fitted with staple and driver guide head 5, which with the staple-carrier 6 is pivoted in the housing I by the pin 1. The housing also carries a movable gripping handle 8, which is coupled with the ejector or driver l through a connecting link 9 and is retained in position against the housing I and away from the staple carrier 6 by a spring ll.

Downward pressure on the movable handle 8 causes the guide head to be forced down upon the pin l4. Further motion of handle 8 causes the ejector or driver It] to push the staple forward in the driving head and then to clinch it on the anvil 3. The anvil 3 is provided with two notches l2|2, positioned in the direction of the bridge portion of the staple, for bending the staple legs outwardly.

In accordance with my invention a pin l4 slidably mounted in a cylindrical hole E3 in the anvil 3, projects centrally between the two notches l2. The pin I4 is provided with a head l5 which normally rests against the under side of the backing plate 4 and is pressed in this position by the leaf spring 16.

The paper B, to be stapled, is inserted in the plier mouth between the pin l4 and the guide head 5 (Figs. 1 and 3), and held fast in this position by gripping and application of pressure on the handle 8. Further motion of the handle 8 will push the ejector or driver l0 downward to the guide head 5 to begin the staple feeding operation, the guide head in the meanwhile being held against further downward movement by the support or the pin l 4. The staple legs a, a penetrate the paper B (Fig. 4) without being bent, the resistance of the paper to the penetration of the staple legsbeing less than the resistance of the spring l6 supporting the pin I4. After the bridge portion b of the staple has left the guide head 5 and rests on the paper B, further pres sure on the handle 8 forces the guide head 5 and the ejector I0 down toward the anvil 3, forcing the pin l4 back into the passage I3 in the anvil against the pressure of the spring IS. The bridge portion b of the staple is gripped between the ejector and the pin during this movement and the staple legs, a, a strike the anvil 3 and are spread outwardly in the notches l2, (Fig. 5). Upon releasing the handle 8, the guide head 5, ejector I0 and pin 14 return to their normal positions under the pressure of the springs II and I6 respectively (Fig. 6).

By means of the division of the operation into two stepsfirst penetration of the paper without bending of the staple legs and then bending the legs while the bridge portion of the staple is held between the ejector I0 and the pin !4the staple legs are given a sharp bend outwardly while the bridge portion remains straight. As a result of the sharp bending of the legs, the staple is held firmly in the paper, but by bending up the paper (Fig. 7) it can be withdrawn and re-inserted easily and without damage. The legs remain straight so that they lie very flat against the paper.

I claim:

In a stapling machine for inverted U-shape staples, a frame member having a fixed jaw, a staple holder movably mounted in said frame member for movement toward and away from said jaw, there being an opening between said holder and said jaw to receive material to be stapled, said holder having a staple guide passage, a driver in said passage adapted to have retracting and projecting movement at its driving end, actuating means for said holder and driver adapted to move said holder toward said jaw and to project said driver to eject a staple from said passage, a p Lr of spaced anvil surfaces carried by said jaw arranged to bend the staple legs outwardly, and a spring pressed depressible member carried by said jaw of less width than the space between said staple legs normally projecting upwardly between said anvil surfaces in line with said passage and driver, and of a height above said anvil surfaces at least equal to the staple leg portions projected through said material, said driver adapted during its projecting movement to first press the staple legs through the material whereupon said material and the bridge portion of said staple are gripped between said driver and said depressible member, and

through further projecting movement to simul taneously depress said member and bend the staple legs outwardly through their engagement with said anvil surfaces.

MAX VOGEL.

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