US1573256A - Hoist-control unit - Google Patents

Description

Feb. 16,1926.

EY 774m Wi. ama s Patente-d Feb. 16, 1926.`

Unirse srarss PATENT oFFlcr..

HENRY E. LOGAN, F CHICAGO, ILLINOIS.

HOIST-CONTRQL UNIT.

Application filed January 17, 1924. Serial No. 686,859.

4hoist control unit for the purpose of preventing the over-Winding and over-speeding of the hoistinff mechanism employed for op* erating theiskip or cage in a mine shatt.

A further object ot' my invention is to pro fide a lio'istY control unit of the type desc 1ibed Yfor automatically shutting off the power of the hoist engine and for applying the brakes' to the hoist drum, yet which is capable of independent and manual operatien by Vthe hoist engineer so that in case ot' failure on the part et the engineer to operate the hoist within the limits oi' safety 'for speed er limit of travel to which the control is adjusted, the control unit will automati- `cally function Without the assistance et an engineer.

A. further object of my invention is to provide a. device ot the type described, that .is compact in term, and that is supported upon aLsingle base, thereby greatly iacilitating the installation of the unit.

ther objects and advantages `will appear in the' tollowing specification, and the novel features orV the invention will be particuarly pointed ont in theV appended claims.

My invention is illustrated in the accom- Y panying drawings jtorming part of this application, in Which- Figure 1 is a side elevation ot an embodiment of my invention, and c Figure 2 is a side elevation of a portion ot the mechanism shown inFigure 1.

1n carrying out my invention T make use of a brake engine consisting of a base 1 and anoperating cylinder 2, mounted upon the base 1, a yoke 3 at the upper end ot' the eylinder 2, anda cataract cylinder 4L mounted uponthe yoke 3 in axial alignment with the cylinder 2, and a piston rod lla, common to the cylinders 2 and el, and arranged to project down into the base portion 1. A valve 'for operating the working cylinder 2 is shown at 5 and is provided with a lever (3 carried by the stem of the valve. A valve tor operating the cataract cylinder l is shown at 7 and has a lever 8 mounted on the stein thereof. A floating lever 9 pivotally mounted intermediate its length upon the outer end of the lever 8 by means of a pm 10. i

A connecting rod 13 is slidably connected at 3a with the innermost end of the lever 9 and is pivotally connected at its lowerinost end with a bell crank la. The bell crank 111 is pivotally supported at la upon the yoke 3.

it control lever 11CL is disposed upon the engineers platform and is connected by means ol a rod 15 with the bell crank 14. A connecting rod 11 is pivotally connected at one end to the outermost end of the lever 8 and at its lower end to the outermost end ol the lever 6. The connecting rod 11 is provided vvith a Weight 12 which has a tendency to move the levers 6 and S in a clockwise direction. a

lt ivill thus be noted that movement of the leverldl as by manual operation by the engineer' will occasion the direct actuation ot the valves 5 and 7 on the working cylinder 2 and cataract cylinder l respectively. At this time the connecting rod 13 will bear upon the innermost end et the lever 9.

The automatic hoist control proper is shown at 16. This control is a somewhat complicated mechanism, and is et the type fully disclosed in the prior patent of lV. J.

-Lilly, No. 1,314,675, dated September Q,

1919. This hoist control isconnected direct ly with the hoisting drum, and driven in a predetermined ratio therewith by a shaft (not shown). The control is supported upon a bracket 17 carried by the base 1 and is so constructed as to cause the circuit breaker forming' a. part thereof, to actuate it the speed of the hoist drum exceeds a predetermined degree. A connecting rod 18, connected to a portion of the hoist control 16, is arranged to move longitudinally, and thereby actuate a graduated stop member 19. This operation ot the rod 18 or its equivalent is fully described in the above mentioned patent and is shown at SO in Figures 3 and 7 of the patent, and its' movement is regulated by the relative position of the cage or skip and the upper and lower ends of the mine sha-tt.

This graduated stop 19 is lully disclosed in a patent et hir. lllilliam J. Lilly, bearing Y 'its'loivermost end 'vvith thelever 2O and the Number `151523,12st, dated September 7*,

1915. l A shaft 2t'is rotatably mounted uponthe' basel in parallel relati'onto the axis-of the stop member 19. A lever 2O is arranged :is permitted to rotate by a-force augmented by the 'Weight 21 iii a counter-clockwise direction as viewed in Figure 1. Obviously the'degree of-rotation in a counter-clockwise direction .of the arm 20, which is free on the 'shaft 24 is regulated by the particular position of the stop 19, Vand the graduated steps or 'stop portions.

Meanspfor causing the initial movement of the shaft 24 in a counter-clockwise direction in the eventof the over-speeding ofl the drum hoist or over-Winding, is provided in a lever 22 carried by theshaft 24 having -a Weight 23 at the outermost end thereof. Thejweight 23 is normally locked in an elevatedv position by means of a latch 37 released through La toggle mechanism 37, when an 'electromagnet shoivnv at 38 is deenergized, as by operation of the circuit breakeignot shown,V forming a part of the controller 16,"to which the magnet coils 38 are connected.- Y

11n the Vaforementioned Patent, No.

1,3145675, thel equivalent of the magnet 38V is found at169 (see'Figure 7). lThe toggle 27A isindi'catedatf95A, 96, 97 and 98, and

theequivalent ofthelatcli 37 is shown at 100.' The circuit breaker mentioned islillustrated inthe patent in Figure 5 'and operates when the cir'ciiitis closed between thel `Wires'SC andk 51C (see lines-60 Vto Z5 of page Means for cushioning the fall of the iveifht-23 and 'consequent movement of the shaft 24l is-'provid'ed in adash pot 26 supported uponabracket 36 and having its piston pivotally connected with the llever 22.

`"In order thatI the valves 5 andv 7 may operlate tov cause the brakeV engine' to function at the same'momentthe shaft 24' is rotated,

by virtue of the Weight 23,k caused by thev operation of the controller 16, 1 provide a connecting rod '32 pivotally -connected at :slidably connected at'35 withI the innermost en'd of the .lever upon the stem ofthe valve k5, lThe provision of this connecting rod 32 causes -a counter-clockwise rotative movement of-the stems of the valves 5 and 7 respectively, thereby 'actuating Vthe 'Working cylinder 2 and the cataract cylinder 4 siiniiltaneously againstfthe force exerted by the Weight12to maintain these valves closed.

The mechanism for actuating the brake shoes associated With V'the' brake drum vot' rsvaaee the hoist, not shown, is provided in a stand 31 upon which a shaft 30 is rotatably mounted. An arm 27 is carried by the shaft 30 kand extends radially therefrom through the base portion 1 of thebralre engine. The loWei-most end of the piston rod 14a is pivotally connected at-28 With the arm 2T 'so that when the working and cataract cylinders2 and d respectively are actuated, the arm 27' is moved downwardly to the position shown in dotted lines, therebyv causing the shaft 30 to rotate in a counterclockwise direction, and draw the connecting rod 29, pivotally connected upon a. lug portion 30 of the arm 27, toward the brake engine7 thereby applying the brakes to the hoist drum.- y

A brake arin Weight-B3 is carried by the outermostend of the arm 27.

A connection rod 39 is pivotally connected at'its upper-end with the outer end of the floating' lever 9 'and at its lower end n with thek arm 27 adjacent to the shaft 30. rlfhe purpose of this rod 39 is to operate the iloatinglever 9 to bring the valves back to a neutral position, as'the pistons move in the cylinders 2 and d, after a movement of the engineers lever. *1nV this Way, the movement of the Weight 33 and arm 27 follows the movement of the hand lever 14, and Will stop at a point corresponding With the point at ivhich the lever is stepped.Y riihe valve in the cylinder L then seals the piston in the position Where it is When the 'valve closes, and prevents the'vveight 33 rfrom dropping, even if the pressure ceases under the loiver piston.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. In general,4 the hoistingl or lowering fof the skips or cages iscontrolled by the operation of.

the lever let by the engineer, thereby actuating theA valves 5 and Y of the Working; cylinder and cataract cylinders respective-ly` to cause the brake shoe operating.mechanism to ope ater ,it should be noted that opera-tion of the shaft 2Lialso causes movement lof a rod 25a which ispivotally connected to van arm 25 carried by the shaft 24, and at its opposite end to the throttle valve of the hoist engine, so that the throttle is simultaneously shut off as the brake mechanism is operated.

Let iis assume that the engineer has failed to properly perform' his duty and thus permitted the hoist to exceed the speed 'for which the control is adjusted, or permits the hoist to proceed beyond the limit of travel for Which the control is set. In this event the control mechanism, as described inthe prior pat-ent of 1W. J. Lilly, No. 1,314,675.

automatically opens the circuit of which I the magnet coils 3S form a part, thereby releasing the latch 37 and permitting the weighted levers 2O and 22 to drop. This operation causes rotation of the shaft 24 and lthe subsequent shut-oill of the hoist engine by means of the rod 25a. Movement ot' the lever 2O causes the downward movement et' the connecting rod 32, thereby actuating the valve lever G, the valve 5, the connecting rod 11. and the valve 7, through the lever 8. ln this manner, the brake engine is operated independently of the engineers control and the weight 33 will carrythe arm 27 downwardly to canse the rod 29 to be drawn toward the brake engine, thereby setting the brakes. The degree to which the brakes are applied in a unit ot' time is regulated by the particular position o't the graduated stop 19, which in turn, as reierence to the aforementioned prior patent to Lilly, No.'1,31/l,65 will show, will depend upon the position oi a cage or a skip in the shaft.

l claim:

1. 'A hoist control unit of the type described comprising a brake engine, a valve tor operating the b 1alte engine, a brake actuating mechanism associated with said brake engine and arranged for operation thereby, a manually operated lever connected with said valve, wherebyT said valve may be manually actuated, automatic means for operating said valve independently of said manually actuated lever, and a controller arranged for synchronism with a hoist drinn, said automatic valve operating means being actuated by said controller, said manually actuated lever being arranged to operate said valve entirely independent ot said automatic means.

2. A hoist control unit ot the type dcscribed comprising a brake engine, a valve for operating the brake engine, a brake operating mechanism associated with said brake engine and arranged for operation thereby, a manually operated lever connected with said valve whereby said valve may Vbe manually controlled, automatic vmeans 'for operating said valve independently of said manually actuated lever, a controller arranged for synchronism with a hoist drum, said automatic valve operating means being actuated by said conti aller, and other means associated with said controller and actuated thereby for limiting the movement ot said automatic valve operating means, said manually actuated lever being arranged to operate said valve entirely independent ot said automatic means.

3. In a hoist control unit o't the character described. a brake engine, a valve for operating the brake engine, a manually operated lever for controlling said valve, and automatic nica-ns arranged for synchronism with a hoist drum for actuating said valve to operate said brake engine independent ot the actuation of said manually operated lever, said manually actuated lever being arranged to operate said valve entirely independent ot said automatic means.

a. A hoist control unit ot the type described comprising a brake engine having a valve for operating the brake engine, a brake actuating mechanism associated with said engine and arranged to be operated thereby, a controller arranged for synchronism with a hoist drinn, a weighted lever associated with the valve and arranged to operate the valve when said lever drops of its own weight, automatic means actuated by said controller ior causing said weighted lever to drop and thereby actuate said valve, and manually controlled means for operating said valve to actuatc the brake engine independen tly of the actuation oi said weighted lever.

ln a hoist control unit ol the character described a brake engine having a valve ttor actuating the engine, automatic means for actuating the valve to operate the engine, and a manually operated lever for actuating said valve, said automatic means being arranged to operate entirely independently ot' said manually controlled lever, whereby the manually operated lever remains stationary during the operation ol the automatic means.

HENRY H. LOGAN.

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