US160615A - Improvement in elevators - Google Patents

Description

Y H. PEARCE.

Elevator.

` Patented March 9,1875.

FIG.1.

FIG.52.

HENRY PEAROE, lOF CINCINNATI, OHIO, ASSIGNOR TO LANE & BODLEY, OF

' SAME PLAGE.

IMPROVEMENT IN ELEVATORS.

Specification forming part of Letters Patent No. 160,6]15, dated March 9, 1875; application filed February 23, 1875.

To all whom t may concern: W

y Be it known that I, HENRY PEARGE, of Cincinnati, Hamilton county, Ohio, have invented a new and useful Improvement in Power-Lifts, of which the following is a specication:

My invention is especially designed for those power-lifts or hoisting apparatus in which a piston propelled by water, steam, or other fluid acting within a closed cylinder operates, through the instrumentality of a rope or cable and a gang of sheaves or travelers in the pistons cross-head, to elevate the cage or platform with a speed and stroke as many times greater than that ofthe piston as the number of said sheaves; and my improvement consists of a provision whereby one or more of said sheaves are made capable of either traveling in company with those permanently effective or otherwise of being held in a stationary condition, at the will of the person in charge, so as to produce the required lift either witlra less or greater stroke of the piston and corresponding consumption of water or other motor, the object being to enable the operator to economize in power expended on the lighter loads.

In the accompanying drawing, Figure 1 is a side elevation, and Fig. 2 is aplan, of an apparatus embodying my invention in that condition in which the separable travelers are held stationary, the piston-rod being shown in nearly its most protruded position. Fig. 3 is a side view of the same, with the piston retracted and the separable travelers free to move in company with those which are permanently journaled to the cross-head. Fig. et is a section on the lineXX. Fig. 5 is an enlarged top view ofthe carriage of the separable travelers.

The following parts may be of the customary or any approved form, to wit: the bedplate A, having standards B, which support and hold immovable the cylinder O. Rising also from the bed-plate are piers D, to which, and to the cylinder', are attached the ways E. A customary piston, F, and rod G are provided, the latter terminating in an open crosshead, L, which, with its rollers Ml, constitutes the carriage or shifting frame of the permanently effective sheaves or travelers N. K represents a gang of idlers77 or stationary sheaves. The service-pipe H, for the inlet and outlet of the water or other fluid, is located at the closed end a of the cylinder. An eyelet, I, upon the cylinder or other fixed object, aii'ords attachment for the fixed extremity of the hoisting-cable J. For the purpose of my improvement the length of the ways E, which constitute the track for the cross-head L, is as much greater than that customarily necessary as is sufficient to support and guide the carriage O of my gang of separable travelers P. The carriage O is supported and guided upon the ways by means of lugs o near the extremities, and rollers M at or near the mid-length of the carriage; or it may be supported wholly on rollers. Journaled in the pier D is a shaft, Q, from which project one or more hooks, R, and a handle, S. These hooks, when engaged over or with the frame of the carriage O, at the outer extremity of the latters stroke, as in Figs. l and 2, operate to hold or detain the said frame with its contained sheaves,which thus become mere idlers, around which the rope travels without acquiring any additional speed over and above that imparted by the permanent travelers. When, on the other hand, it is desired to bring the entire suit of travelers into service, the operator, when the piston has reached the end of its outward stroke, disengages the hooks R, so as to permit the tension of the rope to act upon the carriageO of the separable travelers, causing it to hug and accompany the cross-head in its journeysa condition of theapparatus in which the entire suit of travelers co-operate to reduce the stroke of the piston relatively to that of the platform, with a corresponding saving of the impelling fluid.

I have selected for illustration a form of my improvement which I have found to be effective, but reserve the right to vary or change the specific parts-as, for example, bolts, latches, or other detents may take the place and discharge the functions of the hooks R,

and the hooks or other detainin g devices may at the will of the operator by means of hooks engage over the shaft T of the separable trav- R, or their equivalent, substantially as and for elers, the carriage O being dispensed with. the purpose set forth.

The separable travelers may be of any de- In testimony of which invention I hereunto sired number. set my hand.

I claim as new and of' my invention- In the described combination with travelers HENRY PEARCE' permanently connected with a motor, one or Attest: more separable travelers, P, capable of being GEO. H. KNIGHT,

detached and detained in a stationary position J AMES H. LAYMAN.

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