US511727A - Elevator - Google Patents

Description

(No Model.) 4 Sheets-Sheet 1.

J. A. DEAN. ELEVATOR.

No; 511,727. Patented Dec. 26,1893.

(No Model.) 4 Sheets-Sheet 2.

J; A r DEAN. ELEVATOR. No. 511,727. Patented Dec. 26, 1893.

Ilium HIIII-I IIIIIIIIIIUIH (No Model.) 4 Sheets-Sheet 3 -J. A. DEAN. ELEVATOR.

No. 511,727. Patented Dec. 26. 1893.

(No Model.) 4 sheets sh'eet 4;

J. A. DEAN.

ELEVATOR.

o. 511,727. Patented Dec. 26, 1893.

JOHN A. DEAN, OF \VOROESTER, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 511,727, dated December 26,1893.

Application filed October 23, 1391. Serial No. 409,578. (No model.)

To all whom, it. may concern:

Be it known that I, JOHN A. DEAN, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Elevators, of which the following is a specification, reference being had to the accompanying drawings, forming a part of the specification, and representing the hoisting mechanism of an elevator.

Figure 1, denotes a top view of a hoisting mechanism embodying my invention; Fig. 2, is an end view of the same. Fig. 3, is a sectional view on line X, X, Fig. 1. Fig. 4, is a central horizontal sectional view on line Y, Y, Fig. 2. Fig. 5, represents an end view of the winding drum. Fig. 6, is a plan view of the end of the winding drum shown in Fig. 5. Fig. 7, is an end view of the driving gear showing the side engaging the winding drum and Fig. 8, is a central sectional view of the driving gear.

Similar letters refer to similar parts in the.

difierent figures.

My invention relates to that class of elevators sometimes known as power elevators and in which power is applied to raise the load through a hoisting mechanism, and my invention relates particularly to certain improvements in the hoisting mechanism, by which I secure compactness and simplicity of construction and greater certainty and efficiency of operation and these ends are accomplished by means of the construction and arrangement of the hoisting mechanism as hereinafter described and specifically set forth in the annexed claims.

Referring to the drawings A, A, denotes the supporting frame-work upon which the main shaft B is journaled. Keyed to the main shaft B is a winding drum 0, upon which are wound a hoisting cable C attached to an elevator car and a second, or safety, cable 0 The main shaft l3 projects at each end beyond the framework, and upon one end a belt pulley D turns loosely provided with a long hub D, to the end of which is keyed a pinion D D is a belt pulley D and turning upon the shaft B is a belt pulley D held in place by a collar D, the pulleys D and D forming loose pulleys driven in opposite directions by Turning loosely upon the hub" open and crossed belts and from which the belts are alternately shifted to the central driving pulley D by the shipping mechanism hereinafter described. The pinion D ongages a gear D upon a shaft D journaled on the frame-work A, A and carrying a pinion D engaging the gear D turning loosely upon the main shaft B. of the drum 0 and gear D are provided with the annular concentric flanges E and E The flange E is provided externally with the segmental ribs 13 ,12 and the flange E is provided internally with similar segmental ribs E E The inner sides of the ribs F. and E are inclined as shown at a and 1), Figs. 6 and 8, forming cam surfaces so thatby entering the flange E Within the flange E and rotating the gear D", so as to bring the ribs E behind the ribs E the inclined cam surface a, b, willcause the gear D to be drawn toward the drum 0.,

Placed upon the flange E is a ring E whose thickness is slightly more than the length of the flangeE and having upon its outer face a series of ratchet teeth E engaged by a retaining pawl E held in the frame-work of the machine and limiting the rotation of the ring E to a direction corresponding to that of the winding drum 0 as the hoisting cable is being wound upon it.

In the operat-ionof raising the load, rotary motion is imparted to the gear D in the direction of the arrow 1, Fig. 2, through the central belt pulley D and intermediate connecting mechanism, causing the inclined or cam surfaces a, b of the segmental ribs E F. to be rotated upon each other, drawing the gear D toward the drum C and clamping the ring between their opposing surfaces causing the drum 0 to be rotated in the same direction as the driving gear D", and winding up the cables O and 0 the ratchet teeth F. slipping beneath the spring actuated pawl E Vhen the load is to belowered the gear wheel D" is rotated in the direction of the arrow 2, Fig. 2, and the ring is held from turning by the retaining pawl E if the gear D moves in advance of the drum 0 in the direction of the arrows 2 the inclined surfaces at, l) are movedupon each other to that extent, thereby reducing the friction of the drum 0 against the side of the ring Ff, sufficiently to allow the The opposing sides.

load to turn the druu'rand unwind the hoisting cable; in case, the drum 0 should turn in the direction of the arrow 2 in advance of the gear D", the action of the inclined surface a, I) would again act to clamp the ring E between the drum 0 and gearD, thereby checkmg the rotation of the drum 0 as the ring E is held from turning by the pawl E. No movement, therefore, of the drum 0 in the direction of the arrow 2, Fig. 2, can take place 1n advance of the rotation of the gear D". If the rotation of the gear D should cease through the failure of the operating mechanism the drum 0 would instantly become drawn against the fixed ring E and the descending motion of the load checked.

Theoppositely running belts, carried upon the loose pulleys D and D are alternately shifted upon the central driving pulley D by means of the shipping mechanism consisting of'the sliding bars F and F carrying at their ends belt eyes F2, F and sliding in suitable ways provided in the frame-work of the machine; the opposite ends of the bars F, F'are provided with slots F, that in the bar Fbeing shown by broken lines Fig. 1, by which they inclose averticalshaft G journaled in bearings G at the end of the machine opposite the belt pulleys. The Vertical shaft G carries at its lower end a cam plate G provided on its upper side witha cam groove G the inner half of the cam groove being helical and the outer half concentricwith the cam plate G The slidlngshipping bar F" carries a stud F with a cam roll thereon, entering the cam groove G whereby a sliding movement will be imparted to-the shipping bar F' by' the rotation of the cam G which causes the stud F -to traverse the helical section of the cam groove G and holding the shipping bar from movement while the'stud F traverses the concentric section of the cam groove G Near the upper end of the verticalshaft G is placed a cam plate Hhavinga similar cam groove H, denoted by the broken lines in Fig. 1, but havingthe helical and concentric sections of'the cam groove so disposed that their action will be the reverse of the cam groove G causing the shipping bar F to be moved during the period of rest of the shipping bar F and held at rest during the movement of the bar F. A stud H inthe bar F carries a cam roll entering the groove I-I'.

A reciprocating rotary motion is imparted to the shaft G by means of the drum I attached to its upper end and a shipping cord 1 wound around the drum and carried through the elevator car in the usual manner.

In the drawings the vertical shaft G and its attached cams and connected shipping bars are shown in that position in which the driving belts would-be held upon the loose pulleys D? and D driving them in the direction of v the arrows 3 and 4:, Fig. 1.' If the vertical shaft G and its attached cams G and H be turned around half a revolution in the direction of the arrow 5, Fig. 1, the shipping bar moved along its ways shifting the driving belt from the pulley-D to the driving pulley D, causing the gear D to be turned in the direction of the arrow 2, Fig. 2, unwinding the hoisting cable from the drum 0 and allowing the load to descend. By reversing the motion of the vertical shaft G, one half a revolution, the shipping bar F will be returned to the position shown in Fig. 1, carrying the driving belt from the central pulley D to the loose pulley D and stopping the motion of the hoisting mechanism; the continued rotation of the vertical shaft G in the direction of the arrow 6 will slide the shipping bar F, and

move the driving belt from the loose pulley D to the central pulley D, causing the gear D to be driven in the direction indicated by the arrow 1 Fig. 2, and winding the hoisting cable uponthe drum 0.

Whenever the hoisting mechanism is in operation, either in winding or unwinding .the hoisting cable, the driving belt by which'motion is imparted to the gear D is automatically shifted from the driving pulleyD to the appropriate loose pulley by meansof the following mechanism: The end-of the-shaft 13 projects beyond the frame-work A, A upon the side opposite the belt pulleys, and'the projecting end is provided witha screw thread J; turning loosely'upon the screw threaded section of the shaft isa collar J and a pinion J 2 connected together by the-frame J J provided with guides J J the whole being held upon the shaft by the fixed collar J Midway between thecollar J andthepinion J is placed a nut J 6 provided with arms J embracing the ways "J J by which the nut J is held from rotation andmade'to traverse along the screw threaded section J. Clamped upon the screw threaded section J are the collars J J which are adjustably fixed upon the shaft B in the desired position. The collars J and J are provided with the projecting spurs J J 'and the nut 'J i-s'provided with similar-projecting spurs J J When theshaft B is rotated in the direction IIO of the arrow 1, Fig. 2, in the operation of,

winding the hoisting cable, the nut J is traversed along the shaft 13 toward the framework until its projecting spurs engage ,the

projecting spur upon the fixed collar J ,when

the rotation of the shaft/B willbe communicated through the fixed collar J and the engaged nut J to the frame J and pinion J causing the pinion J to rotate in the same direction as the shaft. The rotation of the pinion J is communicated to a pinion K turning loosely upon the stud K held in the frame-work of the machi'neand carrying upon its side a bevel pinion K engaginga bevel pinion K upon the-shaft G, causing theshaft G to be rotated in the direction of the" arrow 5, Fig. 1; until the driving belt then in action is carried upon its loose pulley, when the m0- tion of the hoisting mechanism will cease. If, however, the motion of the main shaft B is in the direction of the arrow 2, Fig. 2, the nut J will be made to traverse along the screw threaded section J, until its projecting spur engages the spur upon the fixed collar J causing the pinion J to be rotated in the opposite direction, reversing the motion of the vertical shaft G and shifting the driving belt upon its appropriate loose pulley.

Pivoted to the frame-work are levers N, N, carrying at their free ends the rod N upon which are placed the scored pulleys l N capable of rotating upon and traversing along the rod N. These pulleys rest upon the cables C, O and are moved along the rod N as the cables traverse along the drum 0. The weight of the levers N and rod N of rolls N are supported upon the hoisting cables in the position represented in the drawings.

Pivoted to one of the levers N is a vertical lever N capable of being adjusted in its angular relation to the lever N by means of a pin N entering holes in a blade N, or by any other obvious and known method of adjustment. The upper end of the vertical lever N carries a guide pulley N and is provided with an eye N the lever being offset at N to bring the guide pulley and eye in a plane tangential to the face of the upper cam plate I'I.

A cord N is attached to the cam plate H and carried over the guide pulley N and through the eye U supporting the weight N the length of the cord N being such that when the vertical shaft G is turned in the direction of the arrow 5, shifting the belt from the loose pulley D to the driving pulley D and causing the drum 0 to be turned in the direction of the arrow 2, Fig. 2, in the operation of unwinding the hoisting cable, the weight N will be brought against the under side of the eye N If during the operation of unwinding, the cables are broken or slackened allowing the lovers N, N to fall, the cord N will be drawn off the cam plate II rotating the vertical shaft G in the direction of the arrow 6, Fig. 6, until the driving belt is shifted to its loose pulley and the hoisting mechanism stopped.

In the construction shown by the accompanying drawings the drum is attached to the main shaft while the driving gear D turns loosely upon the shaft. If preferred, however, the winding drum may turn upon the shaft and the gear D be keyed to the shaft. I have also shown an annular flange E upon the side of the winding drum entering within the annular flange E upon the side of the driving gear D"; the conditions might, however, be changed and the larger flange carrying the internal ribs can be placed upon the side of the drum, inclosing an externally ribbed flange upon the side of the driving gear.

The entire operation of winding and un winding the hoisting cable is carried on in dependentlyof the main shaft, which is thereby relieved of the end thrust or torsional strain incident to the operation of the ma chine, the only function performed by the rotation of the main shaftB being to actuate the nut J and connected mechanism by which the hoisting mechanism is stopped at each end of the travel of the load. By drawing the gear and winding drum together by means of the cam shaped segmental ribs upon the flanges E and E the torsional strain is transferred to surfaces of greater diameter than the driving shaft.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. In an elevator, the combination of a winding drum, an annular flange projecting from the end of said drum, a driving gear having its axis coincident with the axis of said drum, an annular flange projecting from the side of said driving gear, opposing the flanged end of said drum, said annular flanges overlapping each other and segmental cam shaped ribs carried by said flanges, said ribs interlocking each other, by which said gear and said drum are drawn toward each other, substantially as described.

2. In an elevator, the combination of a winding drum, a driving gear having its axis (30- incident with the axis of said drum, interlocking annular flanges on the opposing sides of said gear and said drum, a ring interposed between said gear and said drum and cam shaped external and internal ribs on said flanges, whereby said gear and said drum are drawn together against said annular ring and the motion of said gear communicated to said drum, substantially as described.

3. In an elevator, the combination of a winding drum, a driving gear having its axis coincident with the axis of said drum, interlocking flanges on the opposing sides of said gear and said drum, external and internal cam shaped ribs on said flanges, whereby said gear and said drum are drawn together, a ring interposed between said gear and said drum and retaining mechanism by which said ring is held from rotation in one direction, sub stantially as described.

4. In an elevator, the combination of a wind ing drum, a driving gear having its axis coincident With the axis of said drum, interlocking flanges on the opposing sides of said gear and said drum, cam shaped ribs on said flanges, by which said gear and said drum are drawn together, a ring interposed between said gear and said drum, retaining mechanism by which said ring is held from turning in one direction, a driving pulley with its axis coincident with the axis of said drum, a pinion carried upon the hub of said driving pulley, an intermediate shaft, a gear carried on said intermediate shaft and engaging said 7 inion and a inion carried on said intermediate shaft and engaging said driving gear, substantially as described. I

5. In an elevator, the combination with a llO supporting frame-work, of a shaft journaled in said frame-work, a driving pulley turning loosely on said shaft,a pinion attached to the hub of said driving pulley, a driving gear carried on said shaft, a winding drum carried on said shaft and operatively connected with said driving gear, an intermediate shaft carrying gears engaging said pinion and said driving gear, whereby the rotary motion .of said driving pulley is transmitted to said driving gear and winding drum, and said shaft relieved from torsional strain, substantially as described.

6. In an elevator, the combination with a shaft, provided with ascrew threaded section, a winding drum operatively connected with said shaft, and driving mechanism connected with said shaft, by which it may be rotated in opposite directions, of a nut J carried upon the screw threaded section of said shaft, a frame J 3 provided with ways J said nut haviug arms engaging said ways, collars J S and J adjustably fixed on said shaft, spurs projecting from said collars and said nut and arranged to mutually engage each other, a pinion J attached to said frame J, a shaft G, cam plates H and G carried by said shaft, shipper bars actuated by said cams, said pinion vJ and said shaft G, being operatively connected through intermediate mechanism, substantially as described.

tently connected therewith, a stud held by the frame-work, a spur gear K turning loosely on said stud and engaging said pinion J a bevel gear attached to said spur gear and engaging a bevel gear upon a shaft G, a shaft G, cams H and G carried by said shaft and shipping bars actuated by said cams, substantially as described.

8. In an elevator, the combination of a shaft G, cams, carried by said shaft, shipping bars actuated by said cams, a lever N pivoted at one end and having its free end supported by the tension of the hoisting cable, a lever N? pivoted upon said lever N, capable of angular adj ustment'thereto, and a flexible connection between said lever N and said shaft G, by which the release of said lever will cause the shaft G to be rotated, substantially as described.

Dated at 'Worcester, in the county of Worcester and State of Massachusetts, this 19th day of October, 1891.

JOHN A. DEAN.

Witnesses:

RUFUs B. FOWLER, H. W. FOWLER.

Images