US500611A - Brake for pulleys - Google Patents

Description

l (No Model.)

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INVENTR /o UNITED STATES PATENT Genion.

BENJAMIN F. RADFORD, OF HYDE PARK, MASSACHUSETTS.

BRAKE FOR PU LLEYS.

SPECIFICATION forming part 0f Letters latent No. 500,611, dated July 4, 1893.

Application filed September 15, 1892.- Serial No. 446,017. (No model.)

To all whom it may concern:

Be it known that I, BENJAMIN F. RADFORD, a citizen of the United States of America, and a resident of the town of Hyde Park, in the county of Norfolk and State of Massachusetts, have invented a certain new and useful Improved Brake for Pulleys, of which the following is a full, clear, and. exact description.

The brake for pulleys of this invention, in substance, consists of brake-shoes located to work against the inner and opposite sides of the surface of the rim of the pulley, separate carriers, one for each of said shoes, and both at one end swinging about a common central or otherwise suitable pintle and at the other end joined. by two toggle-arms having one end of each at abearing on an inner face of each of said carriers, and the other end of both at a bearing on but at opposite ends of a oommon-block which is held on an arm supported from said pintle and is arranged for a movement lengthwise through said arm, and in an axial direction parallel with the axis of the pulley, all substantiallyT as hereinafter described.

In the drawings, forming part of this speciication, Figure l is a side elevation of a pulley andacentral vertical section of the brakemechanism for and on a plane parallel with the opposite sides of the pulley. Fig. 2 is a horizontal section, line 2 2, Fig. l. Fig. 3 is an enlarged vertical section, in detail, line 3 3, Fig. l.

In the drawings,Ais a hollow or chambered pulley having a hub B at and projecting from one of its sides.

C, C2 are two brake-shoes made of any suitable material and each shaped to embrace a portion of the inner surface of the rim of the pulley, the two portions, preferably, being of corresponding width and length. Eachy brakeshoe C, C2 is suitably held on and projected from a similar carrier D, D2. At one side of the pulley both carriers are hinged and swing on a common pintle E as a center and they are held against movement lengthwise of the pintle by and between a iixed shoulder E2 at one end-portion and a screw-nut F.3 at the other end-portion of the pintle, and at the other side of the pulley these carriers are joined together by a toggle-lever mechanism, to be now described.

F, F2 and F3 are the two arms of the togglelever. The toggle-arm F, F2 is in two parts and the part F is adapted to be screwed lengthwise into and out of a threaded lengthwise socket of the part F2, all so that the arm at pleasure may be lengthened or shortened.

The outer ends of each part of the two part toggle-arm F, F2 and also the opposite ends ot the toggle-arm FB are severally rounded off or of hemispherical shape, and both arms are placed lengthwise and in line with each other between the ends D3, D4 respectively of the two brake-shoe carriers D, D2, and the outer rounded end of each toggle-arm is seated in a correspondingly rounded or hemispherical bearing-socket of said ends D3,D4 of said carriers. The ends of the toggle-arms toward each other seat in corresponding rounded or hemispherical bearing-sockets at the opposite ends of a cylindrical block G, in line with said arms, and this block is at the projecting endportion of a cylindrical rod or shaft H axially at right angles to the axial line of the block G and arranged to have a forward and backward movement through a suitable bearing at the outer end of an arm J, forming part of the stationary frame, which arm, at its opposite end, has ixed on it the pintle E about which the brake-shoe carriers swing as stated.

As is obvious, by sliding the rod H in either direction through its bearing ofthe arm J, the toggle-arms are simultaneously moved and if it is in one direction,by aswing of the brakeshoe carriers, the brake-shoes are forced apart and into contact with the inner surface of the rim of the pulley and if it is in the other direction the pressure on the brake-shoe is thus relieved and in consequence the brake-shoes move toward each other and away from the inner surface of the rim of the pulley, all as is obvious without further explanation.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

The combination with a pulley, of a brake and toggle lever mechanism, consisting of brake-shoes located to work on the wheel at opposite sides ot the inner surface of its rim,

IOO

a carrier for each brake-shoe and both at onev at one end the pintle E of the brake-shoe carend adapted to swing on a common pintle E,

riers and at the other end receiving and suptwo toggle-arms extending between the outer porting the rod H, substantially as described,

ends of said brake-shoe carriers and both, at one end, having a bearing on said ends of said carriers, a block G located between the ends of the toggle levers which are toward each other, and said ends having bearings on 0pposite ends of said block, a rod H carrying said block G and extending therefrom in a direction axially parallel to the axis of the pulley and a stationary armJ having fixed on it,

for the purposes specified.

In testimony whereof I have hereunto set my hand in the presence ot tWo subscribing Witnesses.

BENJ. F. RADFORD.

Witnesses:

E. E. CHANDLEE, G. H. COX.

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