US524478A - Grip-pulley - Google Patents

Description

2 Sheets-s (No Model.)

'A. B. BROWN, GRIP PULLEY.

No.-524,478. Patented Aug. 14, 1894.

(No Model.) 2 Sheets-Sheet 2.

r A. ELBROWN.

GRIP PULLEY.

No. 524,478. Patented Aug. 14, 1894.

z. T f 'fNTOR. I

45 ATTORNEY.

W] T NESSES,

mt mums "was 00. woruufuo. WASHINGYDN, n. c,

UNITED! STATES PATENT ()FFIGE'.

ALEXANDER E. BROWN, OF CLEVELAND, OHIO.

GRI P-PU LLEY.

SPECIFICATION forming part of Letters Patent No. 524,478, dated August 14, 1894.

Application filed January 14, 1893- Serial No. 4 ,390- (No model.)

lowing to be a full, clear, and exact description of the same.

My invention relates to that class of pulleys, or wheels, whose rims are provided with an annular central groove or score to receive therope, or cable, and a series of gripping jaws, arranged in pairs upon or within the opposite sides of the said groove, or score, to

, grip the said cable when it is brought between the same.

Figure 1 represents across-vertical section I through the rim of the sheave, or pulley when the pair of gripping jaws exposed thereby is idle. Fig. 2 is a like sectional view disclosing the relative posture of the pair therein, when the cable 0, (shown in similar section) is gripped. Fig. 3 is a perspective view of a right and left grip-jaw, or dog, respectively,-

such as together constitutes a suitable pair for use in the pulley. Fig. 4 shows, perspectively, a sheave equipped with a form of gripjaws, or dogs-and in a manner covered by my invention, and Fig. 5 is a segmental view I in perspective of the rim of a grip-pulley,

provided as in Fig. 4:, and having a portion of theannular shells R removed.

Designating now more particularly the various specific parts and features comprised in the said drawings, and their operative relations to the device, G, in each instance, points out the grip-jaw, or dog, as a whole. The

said pieces G, include the grip-heads A, (havingexterior faces noted by the letters f,) and .1: the heels h, which, in this case are integrally connected with the heads A, by the intervening bodies, or shanks X. X. The said shanks extend at a slight angle below and to the front of the said heads A-into and forming the teeth, or lever-projections Z. Z. which latter arelocated at one side of the faces f. f. to which they pertain, and reciprocally, as respects each other, in each pair.

In the device shownthe heel h is in the na-? ture of a cross-pin, or hub, extending transversely beyond the sides of the shank X, and

last above referred to. .tion of the rim immediately contiguous to the mouth of the score, slopes downwardly therehaving the outer surface somewhat curvilinear, and shortened by the inward slant of its ends. (See Figs. 3 and 5.) In the same form of device M is a groove, or score, extending centrally around the rim, or felly, of the wheel, and of dimensions suitably proportioned,in each construction, according to the size of cable to be employed. The limiting surfaces, or sides, of the said score may be given an outward turn or flare,if desired,

along their upper portions in order to guide the cable as it enters the score. This function, however, is chiefly performed, in the grip-pulley of the drawings herewith, by the supplemental guide pieces, D. D, which are superimposed by, and as a part of, the annular shells R.

The general superficial characteristics of the portion of the rim containing the score M. are important in the particularconstrnction The uppermost porfrom on each side at a uniform angle untilat a given distance from said score the surface of the said portion of the rim tends abruptly in a direction radial to the center of the wheel, and, to a distance that should slightly exceed the diameter of the hubs, or heels, 71,72, which are to be used in the connection. Thereafter the remaining exterior or circumferentialportions of the rim-extend outwardly, in a flange Iikemanner, on

.either side of the central portion thereof last described so as to form the annular bearing surfaces 13. (Fig. 5.)

Atintervals corresponding with the spaces desired between successive pairs of gripping jaws when in operative position about the pulley or wheel, the score M., and the central elevated portion of the rim heretofore described containing the same, are bisected or penetrated transversely by channels, or passages adapted to receive apair of grip-jaws- (except the heels or hubs 72., thereof) and to permit the same to, be vertically oscillated therein. Upon referring to Fig. 5 it will be apparent that, by reason of the said channels or passages, the central portion of the pulleys rim is separated into and consists of a series of elevations, or blocklike projections, 12, b, on opposite sides of the score, having the same dimensions and similar intervening spaces. It is desirable that the said channels, or passages, should, at the same time, likewise divide thetrough of the score M into a corresponding numberof segments to a depth that will permit the interlocking leverprojections Z, of each pair, .to sink-if needs be-during the process of gripping-to any distance required beneath the lowest point of said score. The vertical depth of said channels, or passages, within said central portion of the rim, is, of course, limited by the depth, or thickness, of the said elevations, or blocklike projections 17. b., which bound the same. It should, however, be sufficient, in each case, to enable the grip-dogs G to rock therein, in

- their regular positions, without protruding above the tops of the said projections 19. b.

I R, B is an annular shell, or ring, adapted to be bolted through the lugs L, L,ortobe otherwise affixed, to the rim portions B, B, of

the wheel. The interior configuration of the shells R, is such, that, when the grip-dogs G are duly located in their places within the several channels described, with their hubs in bearing against the outer ends of the said blocklike projections bthe said annular gripping. 1

The particular form of my invention illustrated by the drawings requires that the uppermost edge of the shell R shall be flared outwardly from the score M-as denoted at D-and to thereby afford at each side of the score a fixed and continuous guide-surface which will successively lead the cable to the same relative gripping point in the trough of the score. It is obvious, however, that the feature D, just described, is not essential to my invention in its broadest form--or otherwise than as is hereinafter specifically claimed.

The device may be made and usefully operated without other guide-surface than is afforded by the score proper M, and without the extension thereof provided by the upturned edges and surfaces D.

Beneath the interlocking teeth, or lever- Y projections Z, Z, in each pair of grip-dogs lo- A terlocked lever-projections Z, Z, above the path cated within the said channels or passages intermediate between the block-like projections 1), b,I provide a spring S, with the office of throwing the heads A, A, within the said channels when pressure across the parts Z, Z, is relaxed, and, of maintaining the said heads within said channels, and the said inor trough of the score Mwhen the pressure for the timefbeing is wholly removed.

- I do not intend to limit my invention to the precise manner of securing the said office which I have herein shown and described. Any automatic arrangementwhether by means of springs of any sort or otherwise, that accomplishes the purpose indicated will equally come within the invention I claim.

The several parts of my device having been constructed in substantial conformity with the above description their relative adjustment into the working combination is simple. This consists, mainly, in mounting the gripdogs G in pairs within the said channelsor passages between the block-like portions of the rim (7, b, and thereafter superimposing the annular shells R and afiixing the same respectively to the parts B. The grip-dogs G will thusbe capable of turning about their hubs from a fixed pointandby the tension of the spring Swithout regard to the position of the wheel itself at any time, they will be held behind the faces of the guides D without possibility of contact with the cable until the latter has passed down the said guidesinto direct bearing across the interlocking lever-projections Z, Z. Thereupon by virtue alone of the lever action of the said projections Z-under the powerful percussive impulse of the cable, the opposing faces f, f, of the heads AA, in a given pair of dogs, are successively advanced against the cable and instantly attached thereto. The releasing action of thegrip is equally as positive. Inasmuch as the grip is made by the pressure of the cable upon the lever-projections Z, Z, when the latter are brought, by the revolution of the wheel, or pulley, at a tangential point with respect to the cable, it follows, that when such point is passed, the spring S, will cause the jaws of the dogs Gto' withdraw from contact with the cable and the latter without friction and at oncewill become disengaged therefrom. o

I am aware that grip-pulleys. have been constructed wherein the. grip-jaws are kept to their position by the aid of springs upon which the said jaws restand which, in other details resemble my present device. My said invention, however, is the first-so far as lam aware -in which the several pairs of grip-dogs are arranged'within*or behind-a continuous and stable guiding surface to the scoreand in such manner that they are in no degree exposed to contact with the cable until the exact moment for gripping has arrived; in which, moreover, by reason of the uniform design of the various constituent parts and featuresand the principle of their adj ustmentthese may all be evenly turned up in the manufacture, and readily and speedily assembled.

What I claim as new, and desire to secure by Letters Patent, isv 1. A grip-pulley or sheave having a series of block-like projections on its rim parallel with and oppositely located in respect to a IIO similar series thereon, grip-dogs between said projections having hubs in operative bear ing respectively against the outer bases of said projections, annular shells or rings upon said rim which severally abut against said hubs and extend above said projections and across the spaces in each of said series between the same, levers or teeth projecting from the front of said grip-dogs into the circumferential space between the said series,

and suitable means for automatically oscillating the said grip-dogs until their said fronts are wholly between their said projections respectively whenever said teeth are not subjected to downward pressure by the cable to be gripped, all substantially as shown and described.

2. A grip-pulley or sheave having a series of block-like projections on its-rim parallel with and oppositely located in respect to a similar series thereon, gripdogs in the spaces between said projections in the series having hubs in operative bearing respectively against the exterior of said projections, annular shells or rings upon said rim behind and above said spaces and projections, and

' diverging outwardly at either side of the cirlike projections upon each side of the rim;

grip-dogs pivotally connected in the spaces between said projections in such manner as to project into the score whenever oscillated about their said connections in one direction and to retreat wholly within said spaces when oscillated in the opposite direction, a shellor ring affixed on said sides respectively outside of said block-like projections and spaces, which extends outwardly therefrom and constitutes an annular guide or score, together with levers that project from said grip-dogs into said score, and, suitable means for automatically oscillating and maintaining said grip-dogs wholly within said spaces, when said levers are free from engagement with the cable, substantially as shown and described.

4. A grip-pulley having a series of blocklike projections upon each side of the rim;

grip-dogs pivotally connected in the spaces between said projections in such manner as to project into the score when oscillated about their said connections in one direction, and, to retreat wholly within said spaces when oscillated in the opposite direction; a shell, or ring, aifixed on said sides respectively outside of said block'like projections and spaces, which extends outwardly therefrom and constitutes an annular guide or score, together with levers that project from said grip-dogs and overlap each other in said score, and suitable means for automatically oscillating and maintaining said grip-dogs wholly within said spaces, when said levers are free from engagement with the cable, substantially as shown and described.

ALEX. E. BROWN.

Witnesses:

E. T. SCOVILL, M. MILLARD.

Images