US573739A - wethered - Google Patents

Description

(No Model.) 2 Sheet-Sheat 1. E. R. WETHERED.

' FRICTION PULLEY BLOCK. No. 573,739. Patented Dec. 22, 1896'.

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(No Model.) 2 Sheets-Sheet 2. E. R. WETHERED. FRICTION .PULLEY BLOCK.

No. 573,739. Patented Dec. 22, 1896.

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[finesse UNITED STATES PATENT OFFICE.

EDW'IN ROBERT \"VETIIERED, OF LONDON, ENGLAND.

FRICTION PU LLEY-BLOCK.

SPECIFICATION forming part of Letters Patent No. 57 3,739, dated December 22, 1896.

Application filed June 22, 1896. Serial No. 596,535. (No model.) Patented in England A ril 5, 1895, No. 7,052.

To aZZ whom it flung concern:

Be it known that I, EDWIN ROBERT WETH- ERED, a subject of the Queen of Great Britain, residing at London, England, have invented new and useful Improvements in Friction Pulley-Blocks, (for which I have obtained a patent in Great Britain, No. 7,052, dated April 5, 1895,) of which the following is a specification.

This invention relates to improvements in pulley-blocks, and has for its object to provide simple and secure means for enabling persons to lower others or themselves from the windows of houses in case of necessity, the said pulley-block, however, being also suitable for other lowering purposes.

According to my invention I form the block of two metal cheeks in the ordinary manner, and between these two cheeks I arrange a number of pulley wheels or sheaves, for example, six, in rows of two each, four of the said wheels being fixed to the cheeks by pins on which they rotate, while the other two are mounted on pins which work in slots in the cheeks, so that the said two wheels can rotate and also approach and reeede from one another a distance regulated by the length of the slots. The rope is wound between and around the said pulley-wheels in the manner hereinafter more particularlydescribed. To the ends of one of the cheeks I secure the curved ends of an arm for reversing the pulley-block, which arm extends in front of the other cheek and is provided with a ring for suspending the pulley-block.

In the accompanying drawings, Figure 1 is a front elevation of a pulley-block constructed according to my invention. Fig. 2 is a section on the line 2 2 of Fig. 1. Fig. 3 is a perspective view showing the pulley-block in operation. Figs. at and 5 are views showing a method ofsuspending the pulley-block to the sashes of a window, Fig. at also illustrating the method by which a person can lower himself.

a a are the two cheeks of the pulley-block, the cheek 0. being made slightly longer than the cheek a or being provided with end lugs, as shown.

I) Z) are the pulley-wheels, six in number,

and arranged in three rows, with two pulleys in each row.

a c are the pins or spindles on which the said pulleys b are rotatably mounted, the pins of the top and bottom rows being fixed in the cheeks a a, while the pins of the middle row are supported in the slots d d in the two cheeks, so that the pulleys in the middle row, besides being able to rotate, can move toward or away from each other.

e is the rope, the said rope being passed through the pulley-block and around and between the pulley-wheels c c, as shown in Fig. Both ends of the rope are provided with a hook f and a belt g, which is attached to the person to be lowered.

h is the arm, which, as shown, is secured to the two ends of the cheek a by means of curved looped ends h and extends along the other cheek a about an inch in front of the same. i is a ring on the said arm, which ring, when the pulley-block is in use, is attached to a hook j or to any othersuitable device, as shown in Fig. 3, and k is a belt permanently fitted to the ring 5, which belt is attached to the last person descending by means of the pulley-block.

The operation of the pulley-block is as follows: The block is suspended, by means of the ring '1", to the hook j, and the person to be lowered is secured to the lower end of the rope by means of the band g, while the person controlling the descent grasps the rope at the upper end of the pulley-block, as shown in Fig. 3. The weight of the person at the lower end of the rope and the pull exerted by the person controlling the movement of the rope cause the two middle pulleys to approach each other and grip the rope between them, so that it is prevented from moving. IVhen, however, the person controlling the descent loosens his hold on the rope, the middle pulleys move slightly apart, so that the grip on the rope between them is relaxed and the rope moves downward. When a person has been lowered and it is desired to lower a second person, the pulley-block is reversed in position by tilting it until the arm 7:. slides through the ring 2', so as to bring the latter into the .loop formed by the arm at the other end of the pulley-block and the short end of the rope at the top of the pulley-block, so that the operation of lowering above described can be repeated.

The loops or eyes 71, at the ends of the arm h are so formed that the pulley-block always faces the same way so that the lowering-rope is always on the same side of the said pulleyblock.

Then the operator desires to lower himself, he attaches the short end of the rope to the wall-hook and himself by the belt is, fitted to the ring '5 of the block, which is then caused by his weight to pass down the rope, the descent being controlled by the operator by grasping the free end of the rope, as shown in Fig. 4.

Instead of suspending my pulley-block to a wall-hook a rope, Fig. 5, maybe passed around one side of the two sashes of the window from which the descent is made and the pulleyblock hung on a hook on the end of the rope. In Fig. at the upper end of the pulley-block rope is shown passed around the windowsashes, so that the pulley-block can be used by a person to control his own descent.

It will be obvious that in using my pulleyblock not only can the operator use each'endof the rope, as it is provided with a belt for lowering other persons by simply reversing the block, as above described, but that when the said operator has lowered everybody he can suspend himself by the belt on the ring 1', which drops to the lower end of the block when the latter is lifted from its suspendinghook.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a friction pulley-block, the combina tion with the two cheeks, each provided centrally with two slots directly in line with each other and extending transversely of the checks, of stationary pulleys mounted in said cheeks adjacent to the ends of the same and a pair of movable pulleys mounted in said slots, said slots being of such length as to permit the pulleys to approach each other to clamp the rope between them, substantially as described.

2. The combination with the two cheeks, each provided centrally with two horizontal slots directly in line with each other, and extending transversely of said checks of stationary pulleys at each end of said cheeks, two movable pulleys mounted in said slots, said slots being constructed to allow the pulleys to approach each other to clamp the rope between them, the rope engaging said stationary pulleys passing around the outside of each of said movable pulleys and having a single portion passing between them, whereby the strain upon the rope will draw said movable pulleys toward each other and clamp the rope between them, and suspendingmeans at each end of said cheeks and a belt secured to each end of said rope, substantially as de scribed.

3; The combination with the pulley-block comprising among its members, the two cheeks, stationary pulleys at each end of said cheeks, movable pulleys intermediate said stationary pulleys constructed to approach each other closer than the diameter of the rope and devices at each end of said block for suspending the same, of a rope engaging the stationary pulleys and passing between the movable pulleys, and a belt secured to each end of said rope, and an auxiliary belt secured directly to said pulley-block, substantially as described.

4. In a pulley-block the combination with the cheeks provided with the pulleys, of asuspending-rod secured to one cheek at one end, passing entirely around the other cheek and secured to the opposite end of the firstnamed cheek, said rod having portions at each end of the block in line with thespace between the two cheeks and a suspension device engaging said rod, substantially as described.

-" EDWVIN ROBERT IVETHERED.

\Vitnesses G. F. REDFERN,

J OHN E. BoUsFIELD.

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