US2035436A - Fastener - Google Patents

Description

F. scHAFER March 24, 1936.

FASTENER Filed Jan. 9,- 1935 Patented Mar. 24, 1936 UNITED STATES PATENT OFFICE Application January 9, 1935, Serial No.1,018 In switzer'lana January '16, 1934 7 Claims.

I have filed an application in Switzerland on January 16, 1934.

The present invention relates to fasteners, more particularly to fasteners for textile goods,

e made in the form of a bendable metal clamp. Bendable metal clamps for fastening thin textile articles having two limbs forming a V are known. The object of the present invention is to provide an improved clamp of this type, which is also itsuitable for fairly thick textile articles and is distinguished by the fact that the fulcrum of the upper limb of the clamp, that is, the apex of the clamp does not lie in the plane of the lower limb, as in the known construction, but is 1o- 13 cated at the end of an'in'termediate member connecting the lower and the upper limbs, such intermediate member being so constructed that the fulcrum of the upper limb is located some distance above the plane of the lower limb. The

20 result of this improved construction is a better clamping of the article.

The accompanying drawing shows by way of example three constructions embodying the features of the invention. 7 w

25 Fig. 1 is a sectional elevation of the first construction, V r F Fig. 2 is a front view corresponding to Fig. 1,

Fig. 3 is a sectional elevation of the second construction, 7 v t 30 Fig. 4 is a sectional elevation of the third construction, and

Fig. 5 is a front view correspondingto Fig. i.

In all the figures 0. designates the lower limb of the clamp and b the upper limb. These limbs 35 are of diiferent shapes, the lower limb being substantially plane and the upper limb being curved. The ends of the lower limb a and the upper limb b are connected by an intermediate member which rises in an inclined direction from the 0 lower limb at an obtuse angle so that the upper end d of the intermediate member 0 which constitutes the fulcrum about which the upper limb b is bent down to grip the article s placed upon the lower limb a, is located at an altitude t 45 above the plane of the lower limb.

The lower limb a is provided at its front end with a member bent upwards at an obtuse angle. The end of the member j which is located at an altitude m above the lower limb a 50 carries a claw or lug e bent substantially at a right angle to the member 1 and therefore extending in the direction of the opening left in the operative position of the clamp between the free ends of the clamp. The altitude m is less 55 than the altitude t.

The clamp is preferably made of aluminium and of such thickness that when the upper limb b is bent down to grip the article, as shown by dotted lines'in Fig. 1, the intermediate member 0 will maintain its position, the upper limb I) turning upon d as a fulcrum.

The'ope'r"ation of the clamp is as follows:

A fairly thick material 8 is placed between the limbs w and b as shown, and the limb b is then bent down and at the same time somewhat 10 stretched so that its forward end moves slightly to the left. In its operative position, the limb '1) assumes the position and shape shown by dotted lines in Fig. 1. It will be seen that the material s is somewhat compressed and very firmly gripped between the free ends of the clamp. Owing to the fact that the fulcrum of the limb b is located at a fairly considerable altitude t above the plane of the limb a, the material will bevery firmly gripped between the free ends of the clamp and there will be no tendency for the clamped material to press the limb b upwards and open the clamp, as was the case with the previous construction of such clamps.

Owing to the shape of the parts e and f pulling out of the material from the clamp or vice versa removal of the clamp from the material, is rendered difficult. Owing to the fact that the altitude t is greater than the altitude m, the front part of the limb b will extend almost at right angles with regard to the member I, which improves the clamping action. It may be pointed out that the construction shown in Fig. 1, is particularly as regards the member's e. j, a, and c, somewhat rigid and therefore particularly suitable for material the thickness of which does not Vary.

The construction shown in Fig. 3 differs from that shown in Figs. 1 and 2 only in that the clamp is made of thinner material and is therefore less rigid. With this construction the intermediate member 0 connecting the lower and the upper limbs, is adapted to turn about the point g' of connection with the lower limb a. This clamp is therefore particularly suitable for clamping materials of varying thicknesses and the operation is as follows:-

When the clamp is closed to grip the material 5, the intermediate member 0 turns about the fulcrum g and the upper limb 1) turns about the 5 fulcrum d. As compared with the previous construction, the upper limb b will be somewhat more stretched upon closing the clamp. It will therefore be seen that the point 11 will move downwards and rearwards, as shown in Fig. 3. l

In the third construction according to Figs. 4 and 5 the clamp is again practically rigid as re- 'gards its lower portion, as in the construction shown in Figs. 1 and 2. The parts f and 0 instead of being straight as in the previous constructions, are curved. The limb or is provided with a reinforcing rib 1' extending from the end portion e to the fulcrum d, in order to counteract any tendency of this limb from bending inwardly during the closing of the clamp.

The operation is the same as in the construction shown in Fig. 1, that is, the upper limb b turns to eifect closing about the fulcrum d. This construction is therefore again only suitable for materials of about the same thickness.

I claim:-

1. An inelastic V-shaped bendable clamp more particularly for textile articles, comprising a lower limb and an upper limb and an intermediate member connecting the lower limb and the upper limb, the point of connection of the intermediate member with the upper limb forming the fulcrum about which the upper limb is adapted to turn upon closing the clamp, said fulcrum being located above the plane of the lower limb, substantially as described.

2. An inelastic V-shaped vendable clamp more particularly for textile articles, comprising a lower limb and an upper limb and an intermediate member connecting the lower limb and the upper limb, the point of connection of the intermediate member with the upper limb forming the fulcrum about which the upper limb is adapted to turn upon closing the clamp, said fulcrum being located above the plane of the lower limb, said lower limb being provided at its free end with an upwardly bent portion carrying a lug, the point of connection of said lug and said upwardly bent portion being at a lower altitude than the fulcrum of said upper limb.

3. An inelastic bendable clamp more particularly for textile articles comprising a lower substantially plane limb, an upper substantially curved limb; an intermediate member connecting the lower limb and the upper limb and extending at an obtuse angle with regard to the lower limb; said lower limb having at its free end a portion extending at an obtuse angle, said portion carrying upon its end a lug arranged substantially at a right angle with regard to said portion, the altitude of the fulcrum of the upper limb which is constituted by the upper end of the intermediate member, being greater than the altitude of the point of connection of the bent front portion of the lower limb, substantially as described.

4. An inelastic bendable clamp more particu-' larly for textile articles comprising in combination: a lower substantially plane limb; an upper substantially curved limb; an intermediate portion connecting the lower limb with the upper limb, the point of connection of said curved intermediate portion constituting the fulcrum about which during closing of the clamp the upper limb turns, said plane lower limb being provided with an upwardly curved forward extension and a lug at the end of said forward extension, substantially, as described.

5. An inelastic bendable clamp more particularly for textile articles comprising in combination: a lower substantially plane limb; an upper substantially curved limb; an intermediate portion connecting the lower limb with the upper limb, the point of connection of said curved intermediate portion constituting the fulcrum about which during closing of the clamp the upper limb turns, said plane lower limb being provided with an upwardly curved forward extension and a lug at the end of said forward extension; said lower limb, said intermediate member connecting the lower limb with the upper limb and said forward extension of said lower limb being all formed with a reinforcing rib.

6. An inelastic bendable clamp more particularly for textile articles, comprising a lower substantially plane limb, an upper substantially curved limb; and an intermediate member connecting said lower limb and said upper limb, said intermediate member being adapted to turn about its point of connection with said lower limb and said upper limb being adapted to turn about its point of connection with said intermediate member, the fulcrum about which the upper limb turns during the closing of the clamp being at a substantial height above the plane of the lower limb, substantially as described.

7. An inelastic bendable clamp more particularly for textile articles, comprising a substantially plane lower limb, a substantially curved upper limb; an intermediate member connecting the plane lower limb and the curved upper limb, said intermediate member rising upwardly from the rear end of the lower limb, the upper end of said intermediate member constituting the fulcrum of the upper limb during the closing of the clamp; said lower limb being formed with an upwardly rising forward extension and a lug extending substantially in the direction of the opening of the clamp, substantially as described.

FRIEDRICH scHAFER.

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