US311169A

US311169A - Andrew james bell

Info

Publication number: US311169A
Authority: US
Publication date: 1885-01-27
Anticipated expiration: 1902-01-27

Description

(NOMode1.)

'A. J. BELL.

ROPE PULLEY BLOCK. No. 311,169. Patented Jan. 2'7, 1885.

l INVENTGR aflndrewj'amesfiel By 7221; Attorney WITNESSES UNITED STATES PATENT OFFICE.

ANDREW JAMES BELL, OE MANCHESTER, COUNTY OF LANCASTER, ENG-LAND.

ROPE-PULLEY' BLOCK.

SPECIFICATION forming part of Letters Patent No. 311,169, dated January 27, 1885;

Application filed September 27, 1884. (No model-l Patented in England May 9, 1884, No. 7,451.

a subject of the Queen of Great Britain and Ireland, residing at Manchester, in the county of Lancaster, England, have invented certain Improvements in RopePulley Blocks, (patented in Great Britain and Ireland by Letters Patent N 0. 7,451, dated May 9, 1884;) and I do hereby declare the following to be a full, clear, and exactdescription of my said invention, such as will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form part of this specification.

The object cf this invention is the applicacation to rope-pulley blocks of a friction clip or brake apparatus, whereby the lifting, carrying, suspending, or lowering of heavy Weights can be facilitated and performed with less manual labor than has hitherto been practicable.

Figure 1 of the accompanying drawings illustrates a side view, and Fig. 2 a front view, ofan ordinary rope-pulley block having my improvements applied thereto; and Fig. 3 represents a plan of the frictional apparatus detached from the pulley-block.

Although shown as applied to a pulleyblock with three rope-pulleys, it will be obvious that the improvements are equally applicable to blocks using more or less than three pulleys.

In carrying out my invention I attach a light metallic frame, a, with two projecting cheeks,

b, by preference to the same central bolt or pin, a, which carries the rope-pulleys d. In the face of a wooden block, e, secured to this frame, are formed three grooves, f, in which the pulley-ropes g slide, and mounted upon a pair of right and left handed screws, h and i, projecting from the face of this frame, is a corresponding wooden block, j, similarly formed with three grooves, 70, to receive the pulley-ropes 9. These grooved blocks are capable of being screwed together so as to firmly grasp all the ropes 9 simultaneously, and thus to act as a brake upon such ropes by means of toothed wheels I and m, screwed upon the respective right and left handed screws h and i; The hand-rope a, passing round the pulley 0, serves to impart revolving motion to as illustrated, and thus causes the brakeblocks a and j to approach toward or recede from each other at the will'of the operator. The action of this improved pulley-block will be at once apparent. So long as the brakeblocks 6 and j are free from the ropes g the latter can be drawn through the block and the weight be raised or lowered or suspended; but immediately the hand-rope n is pulled down in the direction of the arrow, revolving motion is imparted to the toothed wheels I and m, and these, acting as screw-nuts upon the screws h and i, thus cause the brake-blocks to approach other, and to squeeze the ropes simultaneously between them. In this manner the weight is effectually locked in position, leaving the operators hands at liberty, and such weight thus remains suspended and cannot be lowered again until the reverse end of the rope a is pulled, when, by a reverse action, the brake-blocks are caused to recede again, assisted by the spiral springs 17, interposed between the blocks, thus loosening their grip upon the ropes. It will be further observed that these brakeblocks also afford facility for regulating the lowering of a weight at any desired speed.

I claim as my invention 1. A friction-brake for ropepulley blocks, having a pair of brake-blocks between which the pulleyropes pass, a pair of right-and-left screws extending through one of said brakeblocks, a pair of toothed wheel-nuts applied to said screws and intermeshing with each other, and a hand-rope pulley attached to one of.

the wheelsl and m, which are geared together