US283831A - thiyee - Google Patents

Description

(-No Modell) G. B. THAYER.

ELBVATOR.

180,283,831. PatentedAug. 28, 1883.

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G. B. THAYBR.

ELBVATOR.

No. 283,831. Patented Aug. 28,1883.

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ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 283,831, dated August 28, 1883. Application filed May 17,1883. (No model.)

To ctZZ whom it may concern Be it known that I, GEORG-E BURDER THAYER, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Elevators; and Ido hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the saine, reference being had to the accompanying drawings, and to letters or iigures of referenee marked thereon, which form a part of this specification.

This invention relates to means for doing away with much of the complicated and eX- pensive machinery now employed to operate power-elevators, as, well as to' obviate the abrupt and jerky motions now so common in this class of elevators.

My invention consists in certain details of mechanical construction, as hereinafter explained.

The drawings accompanying this specification represent, in Figure I, a vertical section, and in Fig. 2 an elevation, of an elevator containing my improvements.

In these drawings, Figs. l and 2, A represents the frame of the structure or the cornerposts of the well, which consists of upright beams B B B B, which constitute the guides of The car is shown in this instance as i the car. adapted to freight purposes, and composed ysimply of a platform, D, upright corner-posts E E E E, spanned at top by horizontal rails F F F F. Upon opposite top rails, E F', of the car I secure standards G G, and in these standards I journal the ends of a shaft, H, and to these ends of said shaft H, Isecure twin wheels I I', grooved in their peripheries. The wheels I I may be pivoted directly to the rails F F and the shaft H omitted. Upon the framework of the elevator-shaft, adjacent to the wheels I I above named, I dispose a counterweight frame, .I J, of usual form, which slides upon vertical ways a a, secured to the adjacent corner-beams, B B, these frames carrying adjustable weights b b in such number and of such weight as may be deemed necessary in each instance. Uponthe top of each frame J J,

I erect standards c c, and in each of these standards I pivot a grooved wheel, d or d. Upon opposite sides of the top of the frame A, and

over the wheels I (l I df, respectively, I ere'ct standards K K, in which I journal the ends of 5 5 leys, and led about such wheels and pulleys, las follows, taking as a starting-point the )t 'shown on one pulley, e, in Fig. l of the drawings:

From this point l the rope on each side of the structure passes down, as shown by the 'numeral 10(011 the side denoted by the numeral 20,) to and about the wheel d, thence upward on the opposite side, as, shown by numeral 11, to and about the lesser groove f',

thence downward on the same side as at iirst, .as shown by numeral 12,150 and about the wheelI, thence upward on the opposite side the latter, as shown by numeral 13, to and about the larger pulley c, thus completing the round of the rop'e.

The operation of this device is as follows: Supposing the driving-shaft L to be in rotation in the direction of its arrow in Eig. l, the side 13 of each rope is winding up on the groove f of large diameter with a tendency to raise' the car, while at the same time that this motion of the car is taking place the part l() of the opposite side of the rope is unwinding from the smaller groove f about the wheel d, and the part l1 ofthe rope upon the same side as part 13 is winding upon the said groove f, to lower the counter-weight at the same rate of speed as the ascending car, Simultaneously with the above movements the part 12 of the rope is unwinding from the smaller groove f about the wheel I, the result being that the car travels at arate of speed equal to the mean between the circumference of the grooves ff. Rotation of the pulleys e c in the Y ments ofthe rope.

the speeds, due to the differential diameters of the pulleys e e', determines the rate at which the car travels. The greater the discrepancy in the diameters of the pulleys of each pair the greater the speed of the car, and vice versa.

The weighted frames perform two functions.

They serve to counterbalance the car, and, in

conjunction with the weight of the car, to cause friction between the rope and the pulleys e c', to prevent slipping of such rope. In setting up an elevatorunder my plan the car and counter-weight frames are to be loaded to produce friction upon the rope, accordingto the desired lifting capacity of such car.

In Figs. 3 and 4 of the drawings I have shown an alternative' construction of my elevator. In this instance I duplicate the pulleys e e e e of Figs. 1 and 2, placing them at the bottom of the structure as well as at the top, these duplicate pulleys being shown in said Figs. 3 and 4 at e2 e2 e3 c3. In this modification I dispense with the counter-weights and their sliding carriages and secure the two pairs of idler-rolls to a single shaft, N, journaled in bearings in the top of the car, these pairs of wheels being shown at I2 I2 1313. The shaftN is not essential. It may be omitted and the wheels pivoted to the top of the car. To exert the requisite friction upon the hoisting-rope in this modified construction, I mount the journals of the shafts P or the pivots of the wheels I? I2 I3 I3 of the lower pulleys, ve2 c2 e3 e3, in twin levers Q Q, disposed at the lower part of the well, and upon opposite sides of the car, these levers being pivoted, as shown at g, to central posts, hh, in the nelevator-well. The tails of the levers Q Q are weighted according to the intended capacity of the car.

The construction of an elevatornnder my plan, as hereinbefore described, does away with much of the comparatively complicated machinery now employed for the purpose, thereby reducing the power required to operate the elevator, as well as lessening the cost of the latter. rIhe motion of the car is smooth and easy, the abrupt jerky movements frequently observed in elevators as heretofore constructed being entirely avoided.

My object in employing duplicate sets of pulleys and'hoisting-ropes, arranged oneupon each side the car, as shown, is to equalize the draft upon the latter and prevent fall of such car in the event of one of the ropes giving out. Any other additional safety device may be used.

In lieu of pivoting the idler-wheels to the car and counter-weights, as shown in Figs. 1 and 2 of the drawings, or jointly to the car, as

shown in Figs. 3 and 4, the said 'idler-wheels may be pivoted jointly to a carriage adapted to slide upon guides secured to upright posts at one side of the elevator-well, while the differential pulleys are pivoted to the top and bottom lof the well,.the hoist-rope being secured at one end to this carriage, thence passing upward about a sheave and secured at its opposite'end to the car; or this last-described rope system may be located in the well above the highest point vreached by the car, the differential groove wheels being journaled in suitable-supports and the carrier of theidlerf wheels traversing horizontal guides.

I claim- 1. In combination with an elevator-carriage and a counterbalanceweight, a differential pulley on the driving-shaft, and an endless suspending rope or chain which passes around the grooves of said pulley and around pulleys attached to said elevator-carriage and weight, substantially as set lforth. y

2. `As the operating mechanism of an elevator-c'ar provided with a counter-weight, an endless traveling rope passing over the two grooves of a differential pulley or sheave, one

bight Vof the ropev being connected with thev In testimony whereof I afIiX my signature in presence of two witnesses.

GEORGE BURDER THAYEE.V

lVitnesses:

, F. i OURTIs,

S. O. MEANS.

IOO

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