Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS790012 A
Publication typeGrant
Publication dateMay 16, 1905
Filing dateJan 27, 1905
Priority dateJan 27, 1905
Publication numberUS 790012 A, US 790012A, US-A-790012, US790012 A, US790012A
InventorsDavid Swope
Original AssigneeDavid Swope
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 790012 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)





Patented May 16, 1905.



SPECIFICATION forming part of Letters Patent No. 790,012, dated. May 16, 1905.

Application filed January 27, 1905. Serial Nvo. 242,886.

.To all whom, t may concern: l

Be it known that I, DAVID Sworn, a citizen of the United States', residing at. Merchantville,in the county of Camden, State of New Jersey,have invented a new and useful Clamp, of which the following is a specification.

My invention relates to the novel construction of a clamp for stretching 4hides or skins and which is adapted to take the place of the customary toggle which has been heretofore used for the most part in the stretching operation, wherein the hides must be perforated along ltheir edges to insert the short togglestrings, which are tied at one end to the toggles and at the other end tacked to the frame. The object of my present invention is to produce a strong and eflicient clamp which' can be manufactured at a minimum expense and is not liable to get out of order and which can be readily applied to thel hide and is so constructed that the pull on the clamp will stretch the hide and more tightly clamp the My invention further consists of other novel features of construction, all as will be hereinafter set forth.

Figure 1 represents a perspective view of a clamp embodying my invention. Fig. 2 represents a section on line m, Fig. 1. Fig. 3 represents a perspective View of one of the v clamping-jaws removed. Fig. 4 represents a plan view showing the clamps in use and se- Flg. 5 represtretching-frame. Fig. 6 represents a" sectional view of the clamp in normal position. Fig. 7 represents a perspective view of a modification.

Similar numerals ofy reference indicate corresponding parts in the figures.

Referring to the drawings, 1 designates my novel construction of clamp, the same consisting of the lower member, body, or plate v2, which has at its forward extension the up' Wardly-turned lip or jaw 3 and at its rearward extension the linger-piece 4, which permits of convenient manipulation, said iingerpiece having the eye 5 therein. WhenIspeak of the length of the jaw or jaws, it will be understood that I mean the distance in what wlas before turning the jaw the length of the p ate. Y

6 designates ears projecting upwardly and in the present instance forwardly from vthe body 2, said ears having thepreferably round bearings 7 therein, in which are the journals 8 ofthe upper member, the latter comprising the plate 9having the downwardly-turned jaw 10, which is preferably longer than the jaw 3 and adapted to overlap and be limited in its motion by and lying on the cord side of the jaw 3, it being noted that the plate 9 and jaw 10 join at substantially an acute angle.

11 designates a finger-piece forming a rearward extension of the plate 9 and having the eye 12 therein, through which passes the cord 13, having the knot 14 therein, constituting means for connection or attachment of the cord thereto, said cord cooperating with the cured to a suitable fastening device 15, which I have shown in Fig. 5 as consisting of a bolt 16, passing through the framework 17 and having the head 18 therein, below which is the washer 19, against which the cord is wound, as indicated in Fig. 5.

' 2O designates the skin to be stretched, the

kgeneral manner of stretching the same prior to treating Fig. 4. l

The operation is as follows: In practice the tanned or, as the case may be, the dyed skin 20 is placed in the frame 17, which is provided with the requisite number of fastening devices 15. The clamps are secured along the edge of the skin or hide as required, and

or enameling being indicated in it will be seen that the edges of the latter are-4 iirmlyheld betweenV the, juxtaposed faces of the jaws 3 and 10, and the tighter the cord 13 is drawn around the fastening device 15 the more firm and effective will be the bite upon the leather.

In practice I prefer to make the entire device of two pieces of metal which can be readily struck up or formed by suitable dies or other mechanism, and Iin order to enable the jaws of the clamp to be readily manipulated IOO the linger-pieces 4 and 11, which are of suicient length to form a handle to enable the workman to readily manipulate the jaws so as to open the same when desired.

It will be seen that by the use of my invention the article or material held between the jaws 10 and 3 cannot be released until the tension on the cord 13 is released, and said material cannot possibly pull out or become detached, and the jaws will hold the same firmly without injury, and that the necessity of punching holes in the material or otherwise mutilating the same to adapt the jaws to be brought into engagement therewith is obviated.

While I have shown and described my invention as being useful and applicable in leather-factories for stretching hides, itis apparent that it may also be used for stretching fabrics of various material or suspending' articles, and as it is simple in construction it may be cheaply manufactured and sold at a comparatively low cost. It also is very durable and when used in leather-factories for stretching leather obviates, as stated, without the necessity of making holes in the same, as required when the old-fashioned toggle or fastener is used. It takes up less room and allows the finisher to work approximately to the edge of the leather without loss of time, as the fastener is of such form as to afford no obstruction to free manipulation during the finishing treatment.

It Will be apparent that changes may be made by those skilled in the art which will come within the scope of my invention,and I do not, therefore, desire to be limited in every instance to the exact construction herein shown and described. In Fig. 6 I have shown the plate 2 as provided with an eyelet 21, through which the flexible connection 13 passes, the function of said eyelet being to minimize friction and prevent Wear on the cord or other exible connection. In the construction seen in Fig. 7 I have shown a finger-piece 4 as provided with an extension 22, which is bent or shaped so as to form the eye 23, through which the cord or other iiexible connection 13, above referred to, in practice passes. I also in some instances for the purpose of giving the plate 2 greater strength and rigidity prov'ide the raised ribs 24, whereby the plate 2 is greatly strengthened and stilfened.

It will be apparent that in Figs. 1, 2, and 4 I have shown the clamps in inverted position for the sake of clearness of illustration, it being of course understood that the parts in use normally appear as indicated in Figs. 6 and 7.

It will be understood that the finger-piece 11, which forms the terminus of the plate 9, may, if desired, be provided with the ears 25, whereby the cord or other flexible connection 13 may be formed into a loop instead of the knot 14 and slipped around said ears 25, the

manner of operation being the same as al ready described.

Having thus described myinvention, what I claim as new, and desire to secure by Letters Patent, isw

' 1. A clamp consisting of a lower member having a jaw, an upper member having a jaw and pivoted relatively to the other member in such a manner that the jaws approach each other substantially in the direction of the length of one of the members, and a flexible connection engaging the two members to clamp the jaws.

2. A clamp consisting of a lower member,

having an upiwirdly-turned jaw, ears on said member, an upper member journalcd in said ears and having a downwardly-turned jaw of greater length than the first-mentioned jaw and movable toward the first-mentioned jaw transversely of its length, said members being provided with means for engaging a connection and a flexible connection corperating with said means to drawthc jaws toward each other.

3. A clamp comprising a lower plate having an upwardly-turned jaw, ears projecting from said plate, an upper plate having a downwardly-deiiected jaw, journals located in said upper plate and mounted in eyes in said cars, an eye in the rear portion of each of said plates and a cord secured in one of said eyes and passing through the other of said eyes.

4. A clamp comprising two members pivotally connected, each of said members having a rearward extension of different lengths, in the two members, and provided with an eye therein and each having a forward extension terminating in a jaw, said jaws deiiected toward each other, and an operating-cord passing through the eye in said longer extension and secured at its extremity to the eye in said shorter extension.

5. A clamp comprising a lower plate, the latter having a forward extension terminating in a jaw and a rearward extension terminating in a linger-piece, ears projecting from said plate, an upper member pivoted in said ears and having a rearward extension or 1inger-piece, and a forwardly-projecting extension terminating in a downwardly-deiiected jaw.

6. A clamp comprising a lower plate, the latter having a forward extension terminating in a jaw and a rearward extension terminating in a linger-piece, ears projecting from said plate, an upper member pivoted in said ears and having a rearward extension or linger-piece, ears on each side of said lingerpiece, and a forwardly-projecting extension terminating in a downwardly-delicctcd jaw, i

said jaws being of different lengths.

7. A clamp having a lower plate, the latter having a forward extension terminating in a jaw, and a rearward extension terminating in a finger-piece, ears projecting from said IOO IOS

plate, an upper member pivoted in said ears and having a rearward extension or fingerpiece, and a forwardly-projecting extension terminating in a downwardly-deiiected jaw, said rst-mentioned plate being provided with longitudinal strengthening-ribs, and one of said linger-pieces having an eye therein.

8. In a clamp, a pair of pivoted plates having inwardly-directed jaws one of which lies between the other and the pivot-point and moves in a line substantially parallel to the other plate and in proximity to it, and means for moving the jaws in proportion to the strain uponl the clamp and compressing the material clamped between the edge of the one jaw and the other plate and between the faces of the jaws.,

9. A clamp comprising a member having an angularly-disposed jaw portion, a second member having an angularly-disposed portion so pivoted in said first member as to have this jaw portion movable substantially in the direction of the length of the rst member, an extension of said second member upon the opposite side of the pivot-point from the jaw portion being provided with means for attaching a cord.

10. A clamp comprising two pivoted members having jaw portions disposed transversely to the direction of strain, relatively movable substantially in the direction of strain and having extensions beyondthe pivot-point, one

of said extensions being provided with means cord.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4038727 *Aug 16, 1976Aug 2, 1977Robbins F PeterOpenable and closeable self-tightening clip
Cooperative ClassificationB25B5/12