US1252350A - Belt-shifting mechanism. - Google Patents

Description

G. H. KNIGHT.

BELT SIHFTING M0HANISM.

Arms/men FILED DEC. I6, 1916.

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1,252,350. A I Patented Jan. 1,1918.

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CONNECTICUT, ASSIGN'OB TO THE HENDEY TOBBINGTON, CONNECTICUT, A CORPORATION.

BELT-SHIFTING MECHANISM.

Specification of Letters Patent.

Patented Jan. 1, 1918.

Application filed December 18, 1916. Serial No. 137,484.

To all whom it may concern:

Be it known that I, Gnonon H. Knron'r, a citizen of the United States, residing at Torrington, in the county of Litchfield and State of Connecticut, have invented a new and'useful Im rovement in Belt-Shifting Mechanism; and I do herebydeclare the following, when taken in connection with the accom anying drawings and the characters of re erence marked thereon, to be a full,

exact description of the same, and which said drawings constitute part of this application, and represent, in-- Figure 1 a broken view 1n of my improved belthifting mechamsm, the tubular shaft employed to connect the upper and lower units of the mechanism beingi centrally broken away.

ig. 2 a corresponding view in side eleyation.

Fig. 3 asectional view on the line H of Fig 1, looking upward.

ig. 4 a sectional view on of Fig. 1, looking downward.

Fig. 5 a broken view correspondln to Fig. 3, showing the canting of the belt-s fting lever of the u per unit of the mechanism turn of the o rating-handle in shifting the belt for re ucing the speed.

Fig. 6 a broken view eorres ending to Fig. 4, and showing the belt-shifting lever of the lowerunit of the mechamsm canted as the result of the/first turn of the operating handle in shifting F ig. 7 a. detached plan view of the bevel er of the lower unit of the mechanism. My invention relates to an improved beltshiftin mechanism for use in. comunctron with apers, lathes, drills, boring mills,

wood-working machinery, et cetera, the obcompact and the line 44 reliable ular reference to quickness and ease of operation and the reduction of belt-wear to the m nimum. a

With-these ends .in view, my invention consists in a belt-shifting mechanism char-v acteri'md by provision for positively twistsw ng outward; with respect to the cone presax-story to shifting it, and having of motion and front elevation rying the belt for reducing the echamsm constructed with partictent oscillation parts as will be hereinafter described and pointed out in the claims.

In carrying out my invention as herein shown, I employ an inclined o eratinghandle 5 pinned to the outer end of a short shaft 6 journaled in an inclined arm 7 formed integral with, and offsetting from a globular gear-case 8 formed with a tubular standard 9 made integral with the upper face of a sliding carrier 10 mounted upon the camplate 11. of the lower unit of the mechanism. As shown, the edges of the said plate are beveled for the retention of the carrier in place as the same slides back and forth upon the late.

T e inner end of the shaft 6 is furnished with a bevel pinion 12 meshing into a bevel gear,13 located within the gear-case 8 and fixed upon the upper end 14 extendin downward through the said tubular stan ard 9,

and at its lower end cara rack pinion 15 meshing into a rack 16 secured to the under face of the said camplate 11 which is positioned so as to follow the tapering outline of the stepped lower cone which, as shown, has four steps 17, 1.8, 19 and 20. The said stepped cone is located within a tapering cone-casing 21 secured. to the machine-frame 22. The cone itself is mounted upon a driven shaft 23. A bracket 24 applied to the outer or smaller end of the cone-casing 21, "is employed for supporting the outer end of the cam-plate 11 the inner of a vertical shaft end of which is supported upon the conecase cover 25. g

The sliding-carrier 10 aforesaid, has 'piv-' otally mounted upon its upper face, a' beltshifting lever 26 swinging upon a stud 27 and furnished at its outer end withan eye 28 through which the poweiigtransmission belt 29 passes. At itsinner end, the said lever 26 has an arm 30 carrying a roller. 31 running in a symmetrical zigzag cam-slot or pathway 32 havin five bonds to produce three oscillations o the lever 26, or one less oscillation than there are steps onthe o'one..

The combined longitudinal movement f the sliding carrier 10 on the cam-plate 11, and.

the tra 10f the r011er31 in the zigzag-cam ment of the belt-shifting lever 26, whereby the belt 29 is alternately twisted with respect to the steps, of-the cone, and moved in ine pathway 32, results in the. intermitand direct or linear move therewith, as will be more fully described in due course. a

The said bevel gear 13 has an upwardly extending hollow hub 33 formed with oppo- 6 sitely located slots 34-, (Fig. receiving the projecting ends of a coupling-pin 35 passing transversely through the rounded-head 36 of a universal-joint piece 37 secured by a pin 38 to the lower end of a tubularshaft 39, the upper end of which is connected with the upper unit of the mechanism, the said upper unit substantially duplicating the lower unit already described, but having the steps of its cone reversed in direction.

A corresponding universal-joint piece 40 is secured by 'a pin l1 to the upper end of the saidshaft 39, the rounded head 42 of the said joint-piece being entered intofthe depending hollow hub 4.3 of a rack-pinion 44 2 Q corresponding to the pinion 15 already described, the said hub 43 being formed with oppositely located slots 45 for the reception of the projecting ends of a coupling-pin 46 passing through the rounded head 42 ofthe said universal-joint piece40.

The pinion 4-1 is mounted upon the lower end of a short ver tical shaft 47 jou-rnaled in a boss 48 formed integral with the uniper face of a sliding-carrier 49 mounted u on i 80 the upper cam-plate 50 which corresponds in construction, arrangen'ient and junction to the lower cam-plate 11 already described. The said cam-plate 50 is. secured at its ends to brackets Hand 52 mounted upon a rod '53 supported at its ends in a pair ofarms 54 adjuslably secured by bolts passing through segmental. slots 56, to the lower ends of COIJIXtQIFShaflL hangers 57 carrying a counter-shaft 58 upon which the upper or driving cone is mounted, the said upper cone having four steps 59, 6 0, 61 and 62 corresponding to the steps 20, 19, 18 and 17, but reversed in arrangement.

secured to the under face of the said camplate vhich is formed with a symmetrical ,Zigza'g cain-slot or pathiay 64 correspondingto the zigzag cam-slot or pathway32 in the plate '11,- and receiving a roller 65' carried by the armffi i oiia belt-shifting lever ,(37 mounted'upon the upper face of the sliding carrier 49 so as to swing upon a stud 68, the outer end of the said lever (S'T 'being furnished with aireye (39 through which the belt 29 passes. T'he sliding of the carrier 4!) over the emu-plate 50 and the travel of the 1 roller 65 in the cam slot'44, results in the Y same ca'nting and direct bodily movement of the lever 6-? with-respect to the'bclt 29, as. i0.already;described, forTthe lever ,26 of the lower-unit of-the mechanism. 1

lavi'ng now described my improved mechanisn i in detail, I will vset forth the mode of its iopcration. f 86 lnfthe drawings the mechanism-is-sliown and 19 of the respective "cones; has now been sh fted'. one step on each'fcone of the belt onestep allft :Inatter ofgearing and having"nothingrtodo as shifted tor s ecuri'iig maximum "speed I of the driven shaft 23, with the belt 29 running over the step20 the lower cone, and

the step 62-'-,of thel'upper 'cQneflIf now the operating handle 25'is turned clockwise, (from left to right) one complete turn, the sliding-carriers'1Dv and 14 will be simultaneouslymoved to the same extent; upon their respectivecam-plates 11 and 50, into the positions shown in Figs." 6 and 5 respectively, with the effect of c'anting' the belt-shifting lever 67 inwardso as to strip the belt 29 "froni the step :62: the upper'eone' and drop it off ontothe adjacentgstep 61 thereof,

whereby the belt is loosened. fAt the same 80 time thebelt-slii'fting lever'26 i's can t'ed outwardlywith the effect of "twisting the belt 29 so as to'spring its'inner edge away from the step 20 of the lower cone 'and outward with respectto the periphery of the step 19 of the. said cone. v I I The turning of the'hfandle' 5 is continued until it completes a'fsecofnd revolution during which the slides 49 and are'siinultaneously n'i'oved fart-her inward with the effeet of restoring the said' l evers ftfl and 26 into the positions in which'they are" shown in I igs. and 4 W ththe exception that they will now be locatediopposite the'fstepsffil Tli' belt in the direction of r educed spe'ed. To further'reducethe speed oflth' driven s'hafti- 23,

the operating-handle 5 is giyeatwo qr rnore complete turns, whereby the belt is'shifted at the'topfland twisted shifted at tli ebottom in the manner already descr'i'bed,aft'er which the belt willbe left ru ning on the steps 60 and, 18 of thefeones. 'ffllwo more completeturns of the handle 5;will infthe same manner shift the belt to runio'verthe steps 59 and-17 of thetwo' bones, "whereby the shaft 2 3-wil1" "be-"driven at its lowest The said pinion tlmehes into a rack 63 y peed-i some inei'e sef'the, spe dier-the stanza; 1 0 i the handle 5'*-1s' given; two ooin pleteturns counter-clockwise, (left to right), whereby the belt will be shi ftedj otltward" from' the clockwisc i the mechani'snishifts" the lower "end ofIthebelt'and twists and shifts the up pr-iend of the beltj which is' -just the-reverse oil \vhat fhap'p len's in re'ducing' the speed The mechanism" can readily be geared-s0 as torequire but one revolutionbf-tlie'fhandle jt'or completing the shifting the Belt; one

step or on thelotlle 19nd,; incge of a very 25 heavyibeltythe mecl msitican be geared-so thatit will requiretln" four -morfe' evouti one of j the" handle t effect the sh fting s being merely a i I l with my fundamental principle. It will be noted that under my invention, the beltshiitting mechanism is selfoontained and positively twists the belt so as to cause its advancing edge to swing outward with respect to the steps of the cones without utilizing them as points of purchase for the adj acent edge of the belt which is mechanically, and thus positively twisted without help from the cones themselves.

It will be seen from the foregoing that my improved mechanism provides for positively twisting the belt to cause its advancing edge to swing outward with respect to the cone before shifting it onto a step of larger diameter, whereby the power necessary to shift the belt is greatly reduced, and the life of the belt prolonged, since when the belt has been twisted, it is ver easily guided from one step to a step 0 larger diameter. The mechanism will be constructed so that the twist produced in the belt will always take place where it runs onto the steps of the cones rather than where it leaves the steps.

I would have it understood that I do not limit myself to the particular construction shown and described, since various instrumentalities might be employed for positively twisting the belt to cause its advancoutward with respect to ing edge to swing t e operation of shifting it.

the cone during Thus, other means than those shownmlght be employed for operating the sliding-carr riers, and the mechanism might be arranged to have the shifting on the overhead cone precede, to some extent, the twisting of the belt on the lower-cone, or vice versa. The shifting and twisting of the belt need not be simultaneousfthough the twisting of the belt must precede the final shifting.

I claim 1. In a belt-shifter, the combination with two stepped cones for the reception of a power-transmission belt, of two self-c0ntained beltshifting mechanisms respectively located adjacent to the said cones and each mechanism bein constructed and arranged to positively twist that portion of the belt adjacent to the complementary cone, without aid therefrom, to cause the advancing edge of such portion of the belt to swing outward with respect to the cone'preparatory to shifting the twisted portion of the belt from a cone-step of smaller to one of larger diameter.

In a belt shifter, the combination with two stepped cones for the reception of apowcr-transmission belt, of two sliding carriers, belt-shifting levers pivotally. mountedthereupon, means for simultaneously moving r Jenn Jscits.

the sail-carriers, and means co-acting with riers, belt-shifting "the said levers for imparting swinging movement to them for positively twisting the belt to cause its advancin edge to swing outward with respect to t e cones without.

outward with respect to the cone prior to shiftin it from cone-steps of smaller to larger liameter.

4. In a belt-shifting mechanism, the combination with two stepped cones for the reception of a power-transmission belt, of sliding-carriers, means for simultaneously moving the same, belt-shifting levers pivotally mounted upon the said carriers, and zigzag cams co-acting. with the said levers to cant the same with respect to the cones for positively twisting the belt to cause its advancing edge to swing outward with respect to the cone before shifting it from conesteps of smaller to larger diameter.

In a belt-shifting mechanism the com.- bination with two stepped cones or the reception of a power-transmission belt, of sliding-carriers, means for simultaneously moving the said carriers, shifting-levers pivotally mounted upon the same, andcamplates arranged in line with the profiles of the stepped cones and containing cam-paths co-acting with the said levers for canting .the same to positively twist the belt to cause as i co-acting with t c said levers for swinging them to effect the positive twisting of the belt without aid from the cones tocause its advancing edge to swing outward with re-' spect to the cones. i

In testimony whereof, I have signed this specification in the presence of twq subscribing witnesses.

GEORGE KNIGHT Witnesses CHAS. H. ALVORD,

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