US295730A

US295730A - Hoisting-machine

Info

Publication number: US295730A
Authority: US
Publication date: 1884-03-25
Anticipated expiration: 1901-03-25

Description

NITED STATES FAYETTE BROWN, OF CLEVELAND, OHI O.

HOISTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 295,730, dated March 25, 1884.

Application filed November 12, 1883.

(N model.)

To all whom it may concern:

. Be it known that I, FAYETTE BROWN, of Cleveland, in; the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Hoisting-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, reference. being had to the a'ccompanyingdrawings, making part of this specification.

My invention relates to a new and useful improvement in hoisting machinery,and though designed more especiallyfor application to or use in connection with apparatus used for hoisting ores, fuel, &c., for the top filling of '15b1ast-furnaces, it may be employed with all sorts of steam hoistin'gmachines. A serious defect in all such machines (so far as 1nyknow1- edge of them extends) and a fruitful source of accident is the liability of the machine or apparatus to overhoist through the careless ness of the engineer or attendant in not shutting off the steam, gas, or other supply at the proper time.

My invention has for its object to entirely remedy this defect or evil in hoisting machinery, as heretofore constructed; and to this end it eonsistsin the combination, with the hoisting-cabledrumandthesteam-supply-pipe valve, of an intermediate mechanism con- 0 structed and operating so that whenever .the drum shall have made the requisite number of turns to efiect the desired hoist, saidintermediate mechanism will be actuated by the drum and will operate upon the steam-supply valve and close it.

To enable thoseskilled in the art to which ,my invention relates to fully understand and practice the same,I will now proceed to more fully describe the construction and operation of a machine embracing my invention in about that form in which I have so far practically tested it, referring by letters to the accompanying drawings, which form part of this specification. i

In the drawings, Figure 1 is a partial face view or elevationof the drum-shaft of an ordinary cable steam-power hoisting apparatus and the connections necessary for the purpose of illustrating my improvement thereon. Fig. 5c 2 is an end view of the same, illustrating by place,)a collar, 0, formed or provided on its dotted lines the motions of the devices for closing the steam-supply valve.

. In the different figures the same part will be founddesignated by the same letter of reference. v

A is part of the shaft of the cable hoist-drum, from which projects axially the screw stud or spindle B, which latter, as clearly seen at Fig.- 1, is threaded for the greater part of, its length, but has a plain or smooth surface near its inner or root end and for some distance therefrom. On the plain or unthreaded portion of the spindle B is mounted,to fit loosely and slide freely thereon, (when not fastened in 5 outer edge with a projecting lug, d, and furnished, as shown, with a set-screw, e, which passes through it, and is adapted to clamp or fasten the said collar immovably in any desired position endwise on said spindle.

O is a crank-arm the lower larger end of which is bored and tapped to fit and work very easily nut-like on the threaded portion of spindle B, and the smaller upper end of which is pivoted to one end of a connecting rod or link, D, the upper portion of which is slotted out,

as seen at E, Fig. 2, to embrace the stem F of the valve in the steam-supply pipe, and is extendedfrom the slotted portion obliquely or at an angle to form the arm I, that operates (in a manner to be presently explained) a lever, J j, the root of which is keyed or otherwise made fast on the valvestem F. The valvestem lever or arm J j is formed with a bifurcation near its outer end (see Fig. 2) for the'acconimodation of the pin or stud f, that projects from the end portion of the arm I, and has one of the forks of its bifurcated portion extended in an oblique direction, as shown at j, for a purpose to bepresently described. 0 From one side of the lower, portion of the crank-arm Gproj ects a lug, 9, (see Fig. 1, which is located so as to be the same distance from the axial line of spindle B that the lug d (on collar 0) is, and these two lugs d and g are adapted, under certain circumstances, to engage with each other clutch-fashion, for a purpose to be presently explained. a YVith What has alreadybeen said in connection with the drawings, the following explanation will make clear the general opera- I tion of the contrivance: Supposing the collar 0 to have been adjusted to and fastened at the proper place lengthwise of the spindle B, and the drum-shaft A to revolve in the direction indicated by the arrow at Fig. 2 to do the hoisting, the rotatory motion of said shaft will cause the spindle B,of course, to rotate in the same direction the same number of turns. This rotation of the spindle B will cause the crank-arm O to travel along bodily (on said spindle) in the direction indicated by the arrow at Fig. 1 at a speed relative to the rotatory motion of B just in proportion to the pitch of the thread of the spindle, and as the rotation of the shaft A and spindle B (together) continues, the crank arm 0 will approach nearer and nearer to the collar 0 until the lug g of said arm will come into engagement with or clutch onto the lug d of said collar. This engagement of these lugs will cause the arm 0 to be rotated with the collar 0 and spindle B until the said arm and the connecting-rod D shall have been made to assume the positions indicated by the dotted lines at Fig. 2that is to say, the turning of the arm 0 by spindle B into the position seen in dotted lines at Fig. 2 will push the rod D in the direction indicated by the arrow, so that its slotted portion E will stand in about the changed relationship to valve-stem F shown, and this movement of said rod will cause the pin f of its arm-like portion I to turn the arm J of the valve-stem into the position shown in dotted lines at Fig. 2, thus closing the valve and cutting off the, steam from the hoist-engine, so that it must stop working.

The object and effect of making the arm J with the oblique toe-like extension j are to permit the pin f of the device I to move onward some distance after having turned the valve stem arm J into a position to close the valve and passed out of engagement with the bifurcated portion of said arm J, and thus enable the said pin and the connecting-rod D and crank-arm O to all move on without further affecting the valve, and at the same time not lose control of the valve-stem arm J, but re-engage with its bifurcation on any return movement of the partSODI T Now, it will be seen that with a contrivanee such as shown and described, if the collar 0 be set so that the operation just explained must take place at the time of the arrival of the elevating-car or other receptacle at the locality where it is designed to stop, no overhoisting of such car or receptacle can ever possibly occur, because always on the arrival of the drumshaft A at that stage of its rotatory travel at which the cable will have hoisted the car to the designed elevation said shaft A must, in the manner and by the means before explained, be deprived of the steam-supply or other motive medium by which the hoist-engine is driven.

Of course many variations in the details of construction may be made without departing from the novel principle of construction and mode of operation of my improved safety-elevator contrivance, the gist of which is in having combined with the hoisting-cable drum and the supply-valve of the engine an intermediate mechanism adapted to cut off the supply of motive power always when the drum and its shaft shall have rotated to a given predetermined extent to wind up a given amount of the hoist rope or cable; also, in having means by which the stopping or cut-off mechanism can be set to come into operation at any given time relatively to the movement of the drum; and, finally, in having the detail construction such that the drum and other moving parts can throw or runby some distance after the closing of the valve, asthey may often have to do by reason of the momentum of the moving parts (which cannot be instantly checked at just the point at which the complete closing of the supply-valve may have been accomplished) and for other reasons.

Having now so fully explained my novel ,contrivance in that form in which I have so far practiced my invention that those skilled in the art can make and use my improved apparatus in any desirable form, what I claim as new, and desire to secure by. Letters Patent, 1s-

1. In combination with the drum-shaft of a hoist engine or machine and the valve or other device through which the supply of steam or other motive medium is applied to said machine, means for closing the valve (or for cutting off the supply of motive power) antomatically whenever the cable drum shall have revolved to apredetermined extent,'and actuated directly from the shaft of said drum, all substantially as set forth.

2. In combination with the drum-shaft and valve-stem, a mechanism for working the valve from the drum-shaft, as specified, and adapted to continue the movements of its parts after having cut off the motive power, whereby the moving parts of the machinery are permitted to continue their motions to the extent induced by momentum without any injury to or derangement thereof.

3. In combination with the drum-shaft, supply-valve, and intermediate devices for transmitting motion from the said shaft to said valve, (to open and close the latter,) means for adjusting or regulating the action of the shaft B on the intermediate mechanism so as to accomplish the working of the valve at any predetermined time desired.

In witness whereof I have hereunto set my hand this 3d day of November, 1883.

FAYETTE BROWN.

In presence of J ACOB FELBEL, M. H. SMITH.