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Publication numberUS152635 A
Publication typeGrant
Publication dateJun 30, 1874
Filing dateOct 22, 1873
Publication numberUS 152635 A, US 152635A, US-A-152635, US152635 A, US152635A
InventorsBenjamin Hewitt
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Improvement in pulley-blocks
US 152635 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

B. `HEWITT & S. GUFF.

Pulley-Blocks..

Patented June 30,1874.

in' e..

IJNrrEDA STATES NPATENT OFFICE.

BENJAMIN HEVlTT AND SAMUEL GOFF, OF BIRMINGHAM, ENGLAND.

VIMPROVEMENT IN PULLEY-BLOCKS.

Specification forming part of Letters Patent No. 152,635, dated June 30, 1874; application iiled October 22, 1873.

To alt whom it may concern:

Beit known that we, BENJAMIN Hnwir'r, of Birmingham, in the county of \Varwick, England, pattern-maker, and SAMUEL GOFF, of the same place, pattern-maker, have invented Improvements in Apparatus for Raising and Lowering Veights or Heavy Bodies, ot' which the following is a specication:

The object of our invention is to render a pulley-block more available for the easy lowering of heavy bodies, and for suspending them at any desired height, and this object we attain by combining with an ordinary pulleyblock the braking and arrest-ing devices shown in the accompanying drawing, in which- Figure l is a side view or' the block, with part of the exterior plate removed; Fig. 2 being an edge view of Fig. l. p

The block itself is constructed in the ordinary manner, too well known to need description, and is, in the present instance, provided with two grooved sheaves or pulleys. To the lower end of the pulley-block is loosely hinged an arm, A, composed of two connected plates, a and a', situated, in the present instance, within the frame of the block,` one plate on each side of the pulley B, and between the two plates of the arm, at the upper end of the latter, is loosely hung a brake-blmck, c, which is curved and grooved on its under side to accord with the rope c, where it passes over the pulley B. The movement of the arm is limited by a curved slot, into which a pin, It, on the said` arm projects. A cord, g, is suspended from the brake-block, and a spring, d, is caused to act on the arm for a purpose which will be rendered apparent hereafter.

In hoisting a weight, by pulling the rope c downward in the direction of the arrow l, Fig. l, the brake-block presents no obstruction to the free movement of the rope, and in lowerin g the weight the rope may move freely in a contrary direction without being disturbed by the said brake-bloclg-providing the rope is maintained in a perpendicular position, (shown in Fig. 1,) where it is free from contact with the block and its arm; but if', during the descent of the weight, the rope e is moved to the inclined position shown by dotted lines, so as to bear against the corner w of the block, it will be the means of moving thel latter in the direction ot' the arrow 2, and of bringing the arm in contact with the rope, which will necessarily be jammed between the said block, and the pulley thereby arresting the weight in its descent.

Vhen the lowering of the weight has to be resumed, all that is necessary is to pull the rope downward to a sufficient extent to move the arm and its block back to the position shown in Fig. l, and then permit the rope to assume a perpendicular position, when the weight will descend without interruption.

The spring d has a tendency to force the arm and its block in the direction of the arrow 2, thereby maintaining the block in contact with the hoisting-rope; but the'block may be withdrawn from contact with the rope e by pulling the above-mentioned cord g, on releasing which, however, the hoisting-rope will be at once arrested.

Ve claim as our invention- The combination, with a pulley-block, of the pivoted arm A, acted on by a spring, d, limited in its movements by a pin, h, and slot in the frame, and carrying at its outer extremity a brake-block, c,to which a cord, g, is attached, all as and for the purpose specified.

In witness whereof we have signed our naines to this specification in the presence of two subscribing witnesses.

BENJAMIN HEWITT. SAMUEL GOFF.

Titnesses T. J. ANDREWS,

Cashier, Tcmgz Bros., Birmingham. J. B. GOULD,

U. S. Consul, Birmingham.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3108345 *Jun 1, 1961Oct 29, 1963Miyoshi KitoWire gripper
US4077094 *Sep 17, 1976Mar 7, 1978Swager William EClamping device for a rope, cable, annular bar, or the like
US5615865 *Mar 8, 1995Apr 1, 1997Fountain; EdwardAutomatically engaging and disengaging pawl and pulley lifting mechanism
US6234454Oct 9, 1999May 22, 2001Peter V. VassioukevitchFailsafe device for raising/lowering articles
US6568511 *Oct 13, 1999May 27, 2003Steven T. DayAdjustable lifting sling
US6742770 *May 1, 2001Jun 1, 2004Peter V. VassioukevitchFail-safe device for raising/lowering articles
US7073780Jun 24, 2004Jul 11, 2006Peter StoneFail-safe cleat with automatic in-line locking cam
US7226043Apr 11, 2005Jun 5, 2007Peter StoneStable fail-safe cleat with automatic in-line locking cam
US7234686Sep 28, 2004Jun 26, 2007Peter StoneFail-safe cleat with automatic in-line locking cam and quick-release slot
US7419138Feb 23, 2007Sep 2, 2008Cmc Rescue, Inc.Self-camming pulley
US20040201005 *Apr 30, 2004Oct 14, 2004Peter StoneFail-safe device for raising/lowering articles
US20040232399 *Jun 24, 2004Nov 25, 2004Peter StoneFail-safe cleat with automatic in-line locking cam
US20050179022 *Sep 28, 2004Aug 18, 2005Peter StoneFail-safe cleat with automatic in-line locking cam and quick-release slot
US20050205852 *Apr 11, 2005Sep 22, 2005Peter StoneStable fail-safe cleat with automatic in-line locking cam
US20080203371 *Feb 23, 2007Aug 28, 2008Mauthner Kirk MSelf-camming pulley
Classifications
Cooperative ClassificationB66D3/10