US477985A - Clutch - Google Patents

Description

l (Remodel.) unam-sheet 1.

G.BENDBR.

GLUTGH. l No. 477,985b l Patented June 28, 1892.

' (No Model.) 4 sheets-.sheen 2.

G. BENDER.

' CLUTCH.

No. 477,935. 'PtentedJune z8, 1892.

- WITNESSES: I

By M .lttornay me News Perini co.. moro-uma, wnamxucn n c (No Model.) G' BENDE'R' sheets-snm a. CLUTCH. No.`477,985. Patented June 28, 1802.

INVENTOR (ewm Attorney.

(No Model.) 4 sheets-sheet 4.

G.BBNDER. n CLUTCH.

PatentedJun 28,V 13927.

No.. 477,985; 5 /vg;

WITNE SES:

m no nms versn oo., Fabro-Luna, wAsmNcYoN, n. c.

.j UNITEIZ#I STATEsf-PATENT OFFICE.'

GEORGE BENDER, oEBEooK-LYN, NEW YORK.

' CLUTCH.

SPECIFICATION forming pm of Letters Patent No. 477,985, dated June '28, 1892.

applicanthaaren-my18,1891.` Seriana. 381,824. (Nomea-.1J

-' .To-all inkom it may con/cern.-Y

' Be it known that I, GEORGE BENDR, a citi-L zen of. the UnitedStates, residing at Brooklyn., Kings county, vNew York, have invented certain Improvements jin Automatically-Opf erating PositiveIfriction-Clutches, of which the followingis a specification. 1 My invention relates in the main to that class l of friction-clutches which arepositive in their action: anddo not depend altogether upon the friction between the .two clutch-surfaces for their action, but wherein saidfsurfaces positively engage one another, friction being em-f ployed ,only to lessen-the noise and strainj caused by the impact between the moving suface and the stationary surface at the moment of starting of themachine ordriven shaft;

The object of my invention is in part to provide a friction-clutch ot this general char-` acter which shall be both noiseless and positive in its action and which shall be especially;

applicable teso-called stop-motions or mech-` anisms such as 'are employed to stop the ro-` tating cam-shaft or driving-shaft of4 various machines-such as type-casting, button-making machines, dac-while some operation not requiring the'working of said machine or its elements is in progress, such as Vthe coolin of the molten material, dic.

My invention also contemplates .means whereby said clutch may be rendered operative or inoperative automatically, according as the operation of the machine may require, as well as the provision `of means-of adjustment whereby said clutch may be renderedloperative or inoperative duringdifferenttimes and at different times in the revolution of the shaft. z

My invention will be hereinafter fully described, and its novel features carefully de-` fined in the claims.

' In order that my invention may be the betff-ter understood, I have illustrated in the accompanying drawings a part of the frame of 'some machine to which my improvements have been applied, but.- have, omitted all parts of such machine which are not connected therewith directly. iu` order to render said draw- Y ings as simple as possible.

Figure l of said drawings is a side view of in the opposite direction,the frame being re- Figs. 7, 8, and 9 are detail views showing the parts in different positions,'which will be hereinafter referred to. I.

In the drawings,Arepresents the machineframe, herein shown in part only, as said frame may be ofv any construction, or may be a part of the frameof the machine to which my improvements are applied. Journaledin bearings at A on this frame is the machineshaft B, which bears at its projecting free end the elements of the clutch, herein shown in the form of tight and loose pulleys D and C, respectively. These pulleys, as herein shown, are constructed of a solid web and periphery, the loose. pulley or driving element C being hollowed out on that face which lies next to pulley or disk D in order to form an inclosing casing forthe working parts therein. The driving element C is somewhat wider than pulley D, beingnecesscd about its periphery in order to receive a-.belt .C from a counter-shaft below, (notfslnowm) and in order to prevent said driving element C from working lengthwise along shaft B, I prefer to provide said shaftwitlraset-collar b. Pulley D is keyed or otherwisesecured to the end of shaft- B in order that the two may rotate together. On the inner face of the driving element C arepivotedhree clutch blocks orshoes c c,'whicl11 are all exactly alike both in form and operation', and as onlyone of these blocks is'in operation at one time I will describe but one of them, setting forth hereinafterthedifference'inoperation when two or three are in action from that where but one is in action.'V rllhe block c consists, as herein shown, of a at metal plate of sufficient strength to sustain the strain upon it at the starting of, the machine-shaft, and is pivoted at cX tothe solid web of. element C,

being provided with a-screW-threaded shank c2 on that side which lies against said web, which shank projects through a slot 02X in the web and receives a set-nut c3 outside for setting the block in position on the'vweb of the pulley. When the block is to be set in itsV operative position, the set-nut c3 is loosened and the block c allowed to fall the length of IOO y is set at the outer end of said slot- 02X.

the slot in which the screw-threaded shank jects a stout clutch-shoe o', provided with a' smooth curved bearing or clutch-face cx, which face is on that side of shoe c nearest the pulley-axis. The curve of said surface eX when the block is set in its inoperative position is concentric with the curved periphery of the driving element or pulley C, but when said block is in its operative position said surface is eccentric to said periphery,-said block falling from its pivot c as a center.

On the inner hollowed face of pulley .D is pivoted a second clutch block or member d of the clutch, which is very similar in form to the blocks o and is pivoted at (ZX to the web of the pulley D. Thisblock dis also provided with a clutch or bearing surface cl ,the curve vof which corresponds with the curve of the surface cX on shoe c, but which is, however, on the outer side of shoe d or that sidelfacing surface cX when the shoes are in engagement. On the inner face of block d is secured a rounded nose of hardened steel by preference, which, when said block is in its operative position, rests between two adjacent teeth of one or the other of two toothed wheels e and f. A springl, secured to a suitable projection cast on the inner face of the web of pulley D,

the studs c5 on block c, so that as said block` passes around during the rotation of the d riving element C it will through its stud c5 impart one-sixth of a revolution to star-wheel c forpurposes'tobeexplained. Thestem gpasses through the web of pulleyD and through an inclosing sleeve D thereon and is adapted to be set in or out at varying positions for purposes of adjustment, which I will hereinafter describe.

In order to secure stem g in position when set, it is provided at the proper points along its length with three annular grooves g g2 g3, which coincide as the stein is pushedin orv drawn out with an opening or saw-cut DX in A spring E, secured the wall of sleeve D. on the boss of pulley D, is arranged to bear at its free end in said opening DX and in that one of the grooves on stein g which may be beneath it, thus holding said stem firmly in place while allowing it to be drawn out or ing, the nose cl3 will rest between the teeth of Wheelf. WVhen the stem is drawn out to its fullest extent, the star-wheel k will be withdrawn out of the path of the studs c5, and said studs will pass around during the rotation of the driving element without actuating the mechanism.

On its outer end, beyond the nose d3, the clutch-block dV is provided with a depending finger or projection d4, which is arranged in the path of the upper end of a lever or lifter h, pivoted at h on the boss of pulley D,the upper end of which is kept pressed in or toward the driving element C by a leaf-spring LX, set on the casing and arranged to bear under saidflever beyond the pivot hX thereof. Said upper arm h of lever h is of an L shape, and its angular portion h2 projects out th rough an opening D2 in the web of pulley D and bears on its outerside a tripper-plate or buffer i, provided with. an inclined volute bearingsurface i', which as the pulley D rotates strikes upon an inclined bearing-plate j, fixed on a bracket J on frame A. The bearing-surface j of plate j is inclined or beveled in the opposite direction to the surface t" ou buffer i, and consequently as the pulley D rotates the two surfaces j and t" will contact, and butter i will be drawn out laterally away from pulley D by reason of such inclines compressing spring h within said pulley.

I will now describe the operation of the devices, premising that only one of the blocks c is in its operative position, the other two being set up concentrically with the periphery of the driving element C, as seen in Fig. 2.

Rotary motion is imparted to the driving element from the counter-shaft (not shown) through the medium of the belt C. As said element rotates (in the direction of arrowa: in Fig. 2) the block c (seen at y, this being` the one set in its operative position) moves around until its pin c5 impinges against one of the teeth of the six-toothed star-Wheel 7a on stem g. This star-wheel beine` secured to the wheels e and f, said stern g being, as represented in Fig. 5, set so as to bring Wheel e, which has six teeth also, under the nose (Z3, said wheel 7c, together with wheel e, will be rotated one-sixth of a revolution, raising said nose, as seen in full lines in Fig. 2. The upper end of the lifter 7L will now be pressed under the projecting linger d4 on block d, said lifter having previously been prevented from passing under said finger by the lowered position of block CZ. Said block will now be upheld in its elevated position by the lifter h, and/as the shoe c is brought around by the continued rotation of the element C the bearing-surface c thereof will impinge upon the bearing-surface c X of shoe cl', and the pulley D will also IOO IOS

IIO

Y noise and strain of the working'parts.

be put into rotaryrmotion. The. elasticity of the parts will allow the surfaces cx and c "f to'slide over one another, and this sliding` motion, or rather the friction between-said surfaces beforethe positive final engagement of the shoes, will to 'a greatextent reduce the Now the pulleys and of course the shaft B move around together' for a full revolution or until the tripper t comes into contact with plate j,

when the opposite inclineson said partswill draw the end h2 of lever 7L outward from the face of pulley D, compressing spring hx until the upper end h of said lever passes outof the plane of the armd4 on the block d, when saidblock will fall by the pressure of the spring Z thereabove, the nose d3 againpeutering between the next two teeth, of Wheel e, as willA be readily understood. Now, the slices cand d lbeing no longer in engagement, the rotation of pulley D and shaft B will cease; butin order to insure the immediate cessation of the motion of pulley D and shaft B after the shoes have been disengaged I prefer to provide the brake device illustrated in Fig. l, wherein. a leaf-spring m, bent into a U shape and secured at one end to a tie-bar A2v of frame A, bears at itsfree end a brakeshoe m', which pressesY elastically upon the periphery of pulley D at all times, and in order that the pressure of said shoe m. may be adjusted to a nicety I prefer to providean adjusting-screw m2, Vwhich passes through said bar A2 and presses at its tip against the free end of spring m.' \Vhen.all three of said blocks c are set inoperative position, the operation will be as follows: Thedriving element C will first communicate one entire revolution to pulley D and shaft B, then there will be a stop in the motion of` said shaft of one-third of a revolution, then a complete revolution', then a stop ofone-third o'f a revolution, then a complete revolution, and,

finally a stop of one-third of a revolution.v

Then but two of' the shoes are in theirgoperative positions, there will first be communicated to shaft B one complete revolution, then a stop of a third of a-revolution, then another full revolution, and then another stop of tWothirds of a revolution. Vhen all three shoes are set in their inoperative positions, of course there will be no rotary motion imparted to shaft B. V

In order to .further vary the movements imparted to shaft B, I have provided the stem g, bearing. the two wheels e and f, before referred to. The Wheel e, as before stated, has

six teeth, and its function is to raise the block d each time the stud c5 passes around and actuates the star-wheel la; but the wheel f has only three teeth, although these` teeth are of the same length vas the teeth of wheel e. Vhen the stem g is pushed in so as to. bring wheel f under the nose clthe duration of the stop in the shaft B wi-ll be increased onefull revolution, as will be readily understood, for said wheel having but three teeth the pin c5 at the time of `first actuating star-wheel- 7c will only serve to bring the next tooth on said Wheel up to they nose cl3, but will' not serve 7o to carry it thereu nder in; order to set the shaft in motion. At the next fullrevolution, h'owever, the tooth of wheelL f beingup against the nose cl3, said tooth will be carried under said nose, raising thelatter and allowing the lifter hto be pressed by its spring in under finger d4,- whereby the block d is held in its raised position and the shoes will engage and shaft -B receive rotary motion.V

Of coursev I'do not-wish to be understood as 8o limiting myself to any particular number or arrangement of the blocks cor any particular number or arrangementof the'teetlrof the wheels e and Las these may be varied according aslthe Working ofthe machinel to which my invention is applied may require.

The form of the parts herein shown is not essential to my invention, particularly that of' pulley C and disk D. The Aconstruction herein illustrated, .however,z1is especially 9o adapted. for the purpose for whichit is def` signed, saidpulley and disk forming Aa convenient inclosing casing for the Working parts. However, this casing maybe dispensed with 'and the clutch members be secured di- 9.5

rectly to the respective shafts in some cases; nor do I wishfto bel understood as limiting myself to that .particular device herein shown for engaging and disengaging the clutchshoes automatically; but that illustrated herei oo driven or machine shaft providedvwith the iro other member or shoe of the clutch, said shoes being provided with eccentrically-set clutchfaces, substantially as described, and moving and adapted to engage one another ina path at right angles tothe axis ofy rotation,.and 115 means, substantially as described, for throwing said .shoes into or out of engagement, substantially as and for the purposes set forth.

2. In. a-positive friction-clutch, the combination, with the driving element provided 12o with one set of shoes or members of the clutch, of the driven or machine shaftprovided with the other member or shoe of the clutch, said shoes being providedwith eccentrically-set clutch-faces, substantiallyY as described; and 125 moving and adapted to engage#4 onse another ina path at right angles to theaxis of rotation,means,-substantially as described, for setting either of the shoes on the driving element into or outzof operative position, and 13o means,I substantiallyas described, for throwing saidshoeon the. driven shaft into or out of operative position, substantially as and for` the purposes setforth. f. 4 f

described my invention, I

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