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Publication numberUS509129 A
Publication typeGrant
Publication dateNov 21, 1893
Filing dateMar 18, 1893
Publication numberUS 509129 A, US 509129A, US-A-509129, US509129 A, US509129A
InventorsFekdinand Johnson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Clamping mechanism
US 509129 A
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Description  (OCR text may contain errors)


No. 509,129. Patented Nov. 21,1893


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SPECIFICATION forming part lof'Letters Patent No. 509,129, dated November 21, 1893.

Application filed March 18, 1893. Serial No. 466.624. (No model.)

To all whom, it may concern.-

Be it known that I, FERDINAND JOHNSON, a citizen of the United States, residing in New London township, in the county of Chester and State of Pennsylvania, have invented certain new and useful Improvements in Olamp ing Mechanisms; and I do hereby declare the following to be a sufficiently full, clear, and exact description thereof as to enable others skilled in the art to make and use the said invention.

This invention relates to clamps for fastening upon objects having parallel sides or nearly parallel sides such as bars, shafts, tubes, ropes and cables and has for its objects to receive motion therefrom, impart motion thereto, or to support, or procure support from such objects.

To secure these desiderata this invention consists of a clamp formed of two interlocking parts, which, when assembled, embrace the object to which they are applied and two or more eccentric wedges, and means of forcing said wedges into converging spaces, in a direction transverse to the length of the object to which the clamp is applied. Such clamps are useful in making connections or attachments to shafts, ropes and cables, and pump rods for the transmission of power, and in constructing scaffolds and in permanent structures of metal work.

The construction and operation of this invention are hereinafter fully described and illustrated in the accompanying drawings.

Referring to the drawings, Figure 1 shows an end view of a clamp embodying this invention, as applied to a cylindric shaft; Fig. 2 a like view, as applied to a wire cable; Fig. 3 a like View, as applied to a tube. Fig. 4 shows a lengthwise section of a duplex form of the invention, applicable to the union of revolving shafts as a coupling for power transmis- Figs. 5, 6, 7, and 8 are detached views of parts of the invention. Figs. 9 and 10 are modified forms of the part of the device for operating and securing the eccentric wedges.

1 represents the bar or other object to which the clamp is applied.

2 and 3 are grooved shells having interlocking hooks 4 and 5 by which they engage each other. The groove in the clamp 2 is of such size and form as to fit on the object 1, or if not of such size, a bushing or liner may be applied to adapt it to fit as indicated at 6 in Fig. 2. The groove 7, in the clamp 3, is made eccentric to that in the clamp 2; in the eccentric groove there are introduced eccentric segmental wedges 8, the inner sides of which are an approximate fit to the body 1, and the outer sides to the groove 7. When the eccentric segmental wedges are introduced their thicker edges 9 should be close to each other.

The wedges 8 are tightened by forcingthem apart, into the converging part of the crescent shaped space, in the grooves between the body 1 and clamp 3. The forcing of the wedges 8 apart to tighten the clamp is accomplished by means of a tapering pointed screw 10, screwed through the clamp 3 as shown in Fig. 1, or by means of a tapering key 11, as shown in Fig. 2; the edges of the key 11, and the thicker edges of the wedges 8, opposed to the key 11 being helical in form.

As shown in Fig. 3 two keys 12 and 13 are used, the parallel sides of which press against the thick edges of the wedges 8, and the helical sides of the keys 12 and 13 fit against each other; the efiect of forcing the wedges 8 into the converging spaces between the object 1 and the clamps 3, is the same although the substitution of screws and wedges changes the form of this part.

, The form in Fig. 4, in lengthwise section, is simply two pairs of wedges 8, in the opposite ends of clamps 2 and 3 so that each pair of wedges can be tightened independently of the other, to adapt them to shafts of difieringdiametral dimensions.

The clamps may have formed on them projections, or other parts adapted to mechanical use, as for instance brackets to support scaffolds or frame work, pulleys or gear wheels to transmit rotative motion and power, or they may be fitted to engage sprocket wheels, or to propel loads as in elevators, or cable transmission of power, or as collars to restrict endwise motion of shafts or arbors in machinery. The clamping action is the same in all cases.

The wedges 8, 8, may have lips 14 formed on the ends as shown in Fig. 10, which preverging space between such object and the interior of the clamp, in combination with wedges adapted to fit and be guided in such space, and means for forcing said Wedges r 5 apart and thereby compressing and clamping the inclosed object, substantially as setforth.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2511906 *May 2, 1947Jun 20, 1950 Lock for electric terminal
US2521192 *Mar 11, 1947Sep 5, 1950Alfred H TessmannArmor rod clamp
US3193634 *Jul 17, 1961Jul 6, 1965Bernard Frank JConnector for display structures and the like
US3745615 *Feb 7, 1972Jul 17, 1973Oberreich RDevice for fastening decorative rods to upright rods of metal railings
US6257792Mar 25, 1999Jul 10, 2001Camco International Inc.Retaining ring
US7225508 *Jul 11, 2003Jun 5, 2007Ching-Yu ChouShut apparatus
Cooperative ClassificationF16D1/04, B60D1/01