US1808025A - Shoe stapler - Google Patents

Description

Patented June 2, 1931 ERNEST DTTNFORD, OF ST. LOUIS, MISSOURI OF ST. LOUIS, M'ISSOURI, A

Parser ASSIGNOR T0 LANDIS MACHINE COMPANY, CORPORATION OF MISSOURI SHOE STAPLER Application filed December My invention relates to shoe staplers of the type described in patent No. 1,016,930, issued February 13, 1912 to WV. H. Borden, and consists in anovel throat block and associated structure for such a machine.

The staples generally used in machines of this type are formed from a continuous strip of flat wire by cutting the wire at intervals with a knife disposed diagonally of the length of the wire in order to provide the staple with a pointed edge to facilitate its entering the work. After having its two ends cut by the knife, the length of wire is given the staple shape by means of formers operating before the staple is presented to the work. The staple thus produced (see Figure 7) has its pointed ends bevelled in opposite directions and the tendency, as the staple is driven, is for one leg to move away from the perpendicular in one direction and for the other leg to move away from the perpendicular in the opposite direction due, obviously, to the thrust of the work against the bevelled ends of the staple.

The result of this tendency is that the points of the staple, after passing through the sole, do not always strike the inner face of the cup-shaped anvil and one point of the staple may miss the anvil altogether. In either case, one point of the staple may not be clinched which affords opportunity for injuring the foot of the wearer of the shoe being stapled and also affords opportunity for the point to project through the upper of the shoe, damaging the same.

The object of my invention is to avoid the above described difficulty by directing the staple so that the tendency of the bevelled points to separate from each other will be resisted.

I attain this object by shaping the grooves in the throat block which guide the staple so that at least one leg of the staple is inclined from the direction which the bevelled point tends to give the leg. I

In the accompanying drawings illustrating a selected embodiment of my invention Figure 1 is a front view of a shoe stapler of the type referred to.

Figure 2 is a top view of the throat block drawn on a greatly enlarged scale.

4, 1929. Serial No. 411,589.

Figures 3 and 4 are vertical sectionstaken on the lines 33 and H of Figure 2.

Figure 5 is a side elevation of the block showing a staple in two positions of its travel therethrough.

Figure 6 illustrates the staple properly driven through a shoe outer sole, upper and inner sole.

Figure 7 is a detail View of an individual staple.

The general arrangement of the mechanism shown in Figure 1 forms no part of my present invention and corresponds to the disclosure of the above-mentioned Borden patent. It will be understood that the mechanism includes a plunger 1, indicated in Figure 5, for driving the staples and a throat block 2 for guiding the staple and an anvil 3 for clinching the points of the staple after the same have passed through the work.

The throat block is detailed in Figures 2, 3 and 4 and includes short converging notches 4 adapted to engage the points of the staple as it moves downwardly from the former and direct the points into the main guiding grooves 5 and 6 which extend from near the upper portion of the throat block to the discharge end of the same.v Groove 5 is straight throughout its length and is disposed parallel with the axis of the throat block. Groove 6 has a slight helical twist, preferably about 25, between its upper and lower ends.

As a result of the arrangement of these grooves 5 and 6, the staple will be slightly distorted as it leaves the throat block (see Figure 5) so that the leg 7, nearest the eye, enters the work vertically while the leg-8, farthest from the eye, enters the work at a slight incline, about 2, from the vertical,

this inclination being in the direction opposite to the inclination which the leg would tend to take due to the thrust against its bevelled edge 9. As a result of this inclination, leg 8 will be approximately straight after it has passed through the work or, at most, will be inclined in the opposite direction from that shown in Figure 5 to such a slight degree that its point will still come within the edge of the anvil 3 and be clinched properly without any likelihood of engaging the outer edge of the anvil and being thrust into the shoe upper.

Figure 6 illustrates a staple driven through the outer sole 10, upper 11 and inner sole 12 and having its points clinched inwardly in the desired manner. 7

'VVhile I have referred to a machine and throat parts which drive and guide the staple downwardly in a general vertical direction, it will be understood that my invention may be embodied in a machine which drives the staple horizontally and, in such event, the term vertical would be equivalent to the direction of the axis of the throat or, in other words, the line of drive.

Various modifications may be made in the detail-structure of my throat block and Icontemplate the exclusive use of such variations as come within the scope of my claims.

I claim:

1. In a shoe stapler, a member for driving a staple, means for directing one leg of the staple vertically as it enters the work, and means for directing the other leg of the staple at an angle to the vertical as it enters the work.

2. In a shoe stapler, a staple discharge throat block having individual elements for guiding the opposite points of a staple in its passage through the block, one or" said elements being straight from end to end and the other of said elements having a slight helical lead. e

3. In. a shoe stapler, a staple discharge throat block having individual elements for guiding the opposite points of a staple in its passage through the block, one of said elements extending parallel with the axis of the throat and the other of saidelements having a helical lead of approximately twenty-five de rees between its upper and lower ends.

l. Iii a machine for driving a shoesole staple having the end of each of its legs bevelled to form a point with one of the adjacent edges, a throat block including elements for guiding the staple into the work so that one ot said bevelled ends and the adjacent edge are inclined on opposite sides of a vertical line passing through the point formed by said end and edge.

5. In a throat block for a stapler'machine, a staple passageway having a straight vertical groove at one side for holding one leg of the staple vertical as it passes through the block: and having a helical groove on the other side for inclining the other leg of the staple at an angle of about two degrees from the vertical as it passes from the block.

6. In a throat block for a stapler machine, a staple passageway having a straight vertical groove at one side for embracing and guiding one leg of the staple as it passes through the block and having a helical groove with its upper end opposite to the upper end of said straight vertical groovefor embracing and guiding the other leg of said staple, said helical groove having a lead of approximately twenty-five degrees between its upper and lower ends.

7. In a throat block for a stapler machine, a staple passageway having a straight groove at one side for guidin one leg of the staple as it passes throu h tlde block and having a helical groove at the other side for inclining the other leg of the staple at an angle to the plane passing through the axis of the passageway and said straight groove.

8. In a throat block for a stapler machine, a staple passageway having a straight groove at one side for guiding one leg of the staple as it passes through the block and having a helical groove at the other side for inclining the other leg of the staple at an angle, of approximately two degrees to the plane passing through the axis of the passageway and said straight groove.

9; In a throat block for a stapler machine, a staple passageway having a straight element for guiding one leg of the staple throughout its travel through said passageway and an element for guiding the other leg of the staple at an angle to the. plane passing through said straight element and the axis of said passageway.

10. In a shoe stapler, a throat block, a member fordriving a staple. therethrough perpendicularly to the surface of the work, and a means for directing a leg of said staple at such angle to the perpendicular at. the point of puncture as it enters the-work as to compensate for the tendency of said leg to incline from the vertical in a difierent direction due to the resistance of the work to'the bevelled end of the leg.

Intesti nony whereof I hereunto my signature this 30th day of November, 1929;

- ERNEST DUNFORD.

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