US229142A - Elevator - Google Patents

Description

2 Sheets-Sheet 1.

J. H. KAZAR.

Elevator.

No. 229,142. Patented Jung 22,1880

I NF 1- $6 A ygwg UNITED STATES PATENT Orricn.

JOHN H. KAZAR, OF BOSTON, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION formingpart of Letters Patent No. 229,142, dated June 22, 1880.

Application filed August 12, 1879.

To all whom 115 may concern Be it known that I, JOHN H. KAZAR, of Boston, in the county of Suffolk, and in the State of Massachusetts, have invented certain new and useful Improvements in Elevators; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which-- Figure l is a perspective view of my improved device, and Figs. 2 and 3 are vertical central sections of the same upon lines intersecting and at a right angle to the posts or guides, i'espectively.

Letters of like name and kind refer to like parts in each of the figures.

The design of my invention is to render more certain the safety of an elevator-car and its load in case of the breakage of any part of the hoisting mechanism or attachments; to which end it consists, principally, in an elevator in which is combined a hoisting rope or ropes, a counterbalance-rope, and safety stops or pawls, the whole being so arranged as to cause said safety stops or pawls to be thrown by said counterbalance rope into engagement with fixed supports Whenever said hoisting-rope is broken or disconnected, substantially as and for the purpose hereinafter set forth.

It consists, further, in the means employed for connecting the hoisting and counterbalance ropes with each other and with the safety stops or pawls, substantially as and for the purpose hereinafter shown and described.

It consists, further, in the means employed for withdrawing the safety stops or pawls from engagement with the fixed support-s, substantially as and for the purpose hereinafter specified.

It consists, further, in the means employed for locking the safety stops or pawls in position when withdrawn from engagement with the fixed supports, substantially as and for the purpose hereinafter shown.

It consists, finally, in the peculiar construction of the pivoted stops or pawls and their connection with the operating-levers, substantially as and for the purpose hereinafter set forth.

In the annexed drawings, A and A representtwo bars or beams, constructedfrom either wood or metal, and securely fastened in a vertical position within a building.

car-top.

Fitted between the inner faces of the bars A is a car, B, which has any desired form or construction, loosely fills the space between said bars, and at suitable points near its upper and lowerends, is provided with lugs O, that embrace the inner face and a portion of each side face of each of said bars, and furnish bearin gs which confine said car in horizontal position, and enable it to slide freely in'a vertical direction over said bars.

The car B is moved vertically by means of hoisting-ropes D, which are connected at one end with suitable winding mechanism, and from the same-pass over pulleys at the top of the building downward to the upper end of said car, and are connected to or with one end of a lever, E, that is pivoted, at or near its center, to or within a lug, e, that is secured to said To the opposite end of the lever E is secured a rope or ropes, F, which from thence pass upward over suitable pulleys, and upon their opposite ends have attached weights w ich counterbalance the weight of the carz leaving only the friction of the bearings a d the load placed within said car to be overcome by the hoisting mechanism.

In order that the car B may be prevented from falling in case of breakage of the hoist ing rope or ropes D, the following-described means are employed:

Upon or within the inner face of each of the bars A is provided a series of teeth, a, which, as seen in Fig. 2, have their upper sides nearly or quite horizontal, while their lower sides are inclined downward and outward.

Within a suitable housing at each side of the upper end of the car B, preferably the lug (J, is pivoted the upper end of a pawl, G, which at its lower end and outer edge is provided with two or more teeth, g, that are the reverse of and are capable of engagement with the teeth a of the bars A, the arrangement being such as to cause said pawls to engage with said toothed bars when their lower ends are swung outward, and to be released from such engagement when their lower ends are swung inward.

The lower end of each pawl G is connected by means of a short bar or link, H, with the short arm of an L-shaped lever, I, which lever is pivoted at the intersection of its arms within the lug G, and has its long arm exv tended horizontally inward to and in a line with the corresponding arm of the opposite lever I.

The inner overlapping ends of the levers I are connected together by means of a strap or stirrup, K, which embraces their outer sides, and is provided with a bolt, 70, that passes horizontally through said parts, the openings provided for said bolt within said levers being lengthened horizontally, so as to permit them to move freely in a vertical direction.

To the upper end of the strap K is pivoted one end of a lever, L, which thence extends laterally and horizontally toward one side of the car B, is pivoted at or near its longitudinal center within a bearing, M, that is secured upon the upper side of said car, and at its opposite end has pivoted one end of arod, N, which from thence passes downward into said car and terminates near the floor of the same, at which point is secured a small platform, 0, upon which the whole or a portion of the weight of the person operating said car may be thrown.

Suitable weights 1?, placed upon the long arms near the ends of the levers I, counterbalance the weight of the rod N and platform 0 and cause the pawls G to engage automatically with the toothed bars A, while, by the depression of said platform, said pawls will be withdrawn from such engagement and the car left free to descend.

In practice it is intended that the operator shall stand upon the platform 0 while the car is in motion, and should there be injury or breakage to any portion of the hoisting apparatus or machinery, or attachments thereto, or of the car itself, he has only to step off from said platform to release the safety-pawls Gr, and to cause them toinstantly engage with the toothed bars A and arrest the motion of the At times, when but small loads are being moved by the elevator, it may be desirable to trust entirely to the counterbalance mechanism, in which event the pawls Gmay be withdrawn from engagement with the toothed bars A and locked in such position by means of a strap, Q, which is hinged upon the side of said car contiguous to the rod N, and may be caused to confine the latter against said carside immediately above a shoulder or enlargement, it, provided upon said rod.

If'desired, the platform or treadle 0 may be detached and the safety-pawls held out of engagement by the hand of the operator grasping a suitable handle upon the rod N, for which purpose the enlargement n is made a coupling, which permits all of said rod below such point, together with said platform, to be removed at will.

H In order that the safety-pawls G may be "thrown into engagement by the breakage of the hoisting-ropes D, the end of the lever E, to which the latter are attached, is arranged near the inner coupled ends of the levers I, and is connected therewith by means of a rope, R, which has sufficient length to permit said parts to work freely while said hoistingropes are intact; but in the event of breakage of the latter the raising of the outer end of the lever E by the counterbalance-ropes F would cause said levers I to be instantly drawn downward and said pawls G to be forced into engagement, so as to arrest further motion of the car. ,7

In consequence of the provision of extra teeth gupon the safety-pawls G, a material increase is secured in the strength of the same and of the toothed portions of the beams A, the strain caused by the engagement of said parts being distributed sufficiently to render certain their integrity under the most severe strain.

Should the car he raised while the safetypawls G are engaged, the form of the teeth g and a will cause said pawls to trip and pass over said teeth a with ease and without injury.

Having thus fully set forth the nature and merits of my invention, what I claim as new 1s- 1. In combination with the elevator 13, the hoisting and safety ropes D and F, respectively, the safety-pawls G, the links H, the levers I, and the stirrup K, said parts being arranged to operate in the manner and for the purpose substantially as set forth.

2. As a means for connecting the hoistingropes D and counterbalance ropes F with each other, the car B, and with the operatinglevers I of the safety-pawls G, the lever E, pivoted centrally upon the upper end of said car, and the rope R, extending from one end of said lever E to the inner ends of said levers I, substantially as and for the purpose shown and described.

3. In combination with the safety-pawls G,

the links H, levers I, the strap K, the lever L, the rod N, and the platform 0, substan tially as and for the purpose specified.

4. As a means for locking the safety-pawls in position when withdrawn from engagement, the enlargement it, provided upon the rod N, and the clamp Q, hinged to or upon a fixed support and arranged to clasp said rod above said enlargement, substantially as and for the purpose shown.

5. The combination of the safety-pawls G, provided each with two or more engagingteeth, g, and pivoted at or near their upper ends, the links H, pivoted each at one end to the lower end of one of said pawls, the L- shaped levers I, having their short arms connected with said links and their long overlapping arms coupled together, and means whereby the latter may be moved vertically, substantially as and for the purpose set forth.

In testimony that 1 claim the foregoing I have hereunto set my hand and seal this 31st day of July, 1879.

JOHN KAZAR.

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