US596829A

US596829A - Automatic safety-stop for hoisting-engines

Info

Publication number: US596829A
Authority: US
Publication date: 1898-01-04
Anticipated expiration: 1915-01-04

Description

(N0 Medal.) 3 Shets-Sheet 1.

J. E. RICHARDS. AUTOMATIC SAFETY $TOP FOR HOISTING ENGINES.

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(N0 Model.) 3 Sheets-Sheet 2.

J. E. RICHARDS. AUTOMATIC SAFETY STOP FOR HOISTING ENGINES.

Patented Jan. 4, 1898.

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(No Model.) 3 Sheets-Sheet 3.

I J. E. RICHARDS. AUTOMATIC SAFETY STOP FOR HOISTING ENGINES.

Patented Jan. 4,1898,

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UNITED STATES PATENT Critics,

JAMES E. RICHARDS, OF CALUMET, MICHIGAN.

AUTOMATIC SAFETY-STOP FOR HOISTINGENGINES.

SPECIFICATION formingpart of Letters Patent No. 596,829, dated January 4, 1898. e fil d March 15, 1897. Serial No. 627,538. on s.)

To all whom it may concern.-

Be it known that 1, JAMES E. RICHARDS, of Calumet, in the county of Houghton and State of Michigan, have invented a new and Improved Automatic Safety-Stop for Hoisting-Engines, of which the following is a full, clear, and exact description.

The invention relates to hoisting-engines for raising and lowering the cages in mines; and its object is to provide a new and improved safety-stop for hoisting-engines, arranged in such a manner as to automatically control the admission of the motive agent for the hoisting-engine, to control the brake mechanism and the reversing-lever in case the speed of the engine is not checked before the cage reaches the landing.

The invention consists principally of a screw-rod driven from the engine in unison with the movement of the hoisting cable or cables, a nut mounted to travel on the said screw-rod, and a tripping-arm adapted to be raised by the said nut and moved in engagement with the governor or other movable part driven from the engine, the said trippingarm controlling a device connected with the admission-valve, the brake mechanism, and the reversing-lever.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a front elevation of theimprovement. Fig. 2 is a side elevation of the same. Fig. 3 is a plan view of the same. Fig. 4 is a sectional plan view of the same on the line i 4 of Fig. 1. Fig. 5 is a similar view of the same on the line 5 5 of Fig. 1. Fig. 6 is a like view of the same on the line 6 6 of Fig. 1. Fig. 7 is a sectional side elevation of the spring-pressed friction-roller on the stoplever. Fig. Sis a side elevation of the spring for holding the tripping-arm in place on the support. Fig. 9 is a sectional plan view of the improvement on the line 9 9 of Fig. 2, and Fig. 10 is a similar View of the same on the line 10 10 of Fig. 1.

The automatic safety-stop to be hereinafter described in detail can be attached to any hoisting-engine whether one or two cables or ropes for hoisting one or two separate cages are operated by one drum. As shown in the drawings,the device is intended for two cables or ropes on one drum, and hence the machine is built double, the parts of the two machines being alike in construction, so that it suffices to describe but one, as the act-ion of both machines is exactly the same. When one cable or rope is used, only one such machine is employed.

The improved device is mounted on a suitably-constructed frame A, provided with a base A, a top plate A and columns A connecting the said base A with the top plate A In the latter are fitted, to slide vertically, sets of rods B, of which the two rods in a set are connected with each other at their lower ends by a curved arm 13, and the upper ends of the rods in two adjacent sets are connected with each other by a cross-head B as plainly shown in the drawings. The rods B, arms 13, and cross-head B form a vertical slide.

On the under side of each cross-head B is screwed a loop C, engaged by a pin orafriction-roller D, held on the free end of an arm D, secured on a shaft E, jour'naled in suitable bearings E, secured to the top plate A Near the middle of the shaft E is secured an upwardly and outwardly extending arm F,

' connected by a link F with the steam-brake and reversing-lever for the hoisting-engine and by a link F with the valve-stem of the admission-valve for the engine, so that when the arm Dis caused to swing in the direction of the arrow a, as hereinafter described more fully, the steam-brake, the reversingdever, and the steam-valve are actuated to stop the hoisting-engine. On one end of the shaft E is secured a curved arm E formed at its free end with a seat E for the peripheral surface of a roller G, journaled in the forked end of a rod G, pressed on by a spring G held at its lower end on an eyebolt G held adjustably on a bracket A, secured to one of the columns A (See Fig. 2.)

The spring G holds the roller G at the end of the arm E so as to hold the shaft E in normal position, with the arm D supporting the rods B in an uppermost position, as illustrated in Figs. 1 and Then the arm D is caused to swing downward in the direction of the arrow at, thenpward movement of the curved arm E causes the roller G to roll off its seat E to release the latter and the pressure of the spring G so thata quick closing of the admission-valve and a quick application of the brake mechanism and reversing-lever takes place, as hereinafter more fully described.

The arms B are adapted to be engaged by a tripping-arm H, mounted to slide loosely at its middle on the upper smooth end of a screw-rod I, journaled in suitable bearings formed in the top plate A and a casing A attached to the base A. The arm l-I normally rests near its ends on supports J, clamped or otherwise secured on verticallydisposed rods K, attached to the top and bottom plates K and K rigidly connected with each other by stay-bolts K so as to form a frame guided on vertically-disposed guiderods A depending from the top plate A of the frame A. The bottom plate K of the said supporting-frame for the tripping-arm H is adapted to be lifted by a nut I, in which screws the screw-rod I, and which nut is provided with an arm 1 fitted to slide vertically on a guide-rod A, attached to one of the columns A of the main frame A. The tripping-arm II is provided with downwardlyextending rods H, passing through slots K formed in the bottom plate K, (see Fig. 10,) and on the lower ends of the said rods H are hung the weights H so that when the tripping-arm H is moved off its supports J it rapidly slides downward by the action of the said weights ll until the ends of the arms engage the arms B of the rods B. The arm H is normally held in place on the supports J by springs K attached to the top plate K, as shown in Fig. 8; but the said springs yield when the free ends of the arms H are forcibly turned around, so as to disengage the arm from its support. The free ends of the arms H are adapted to be engaged by the governor-arms N of a centrifugal governor N, having its shaft N 2 journaled in the top plate A and in a column A attached to the base A. (See Fig. 1.)

The lower end of the shaft N is provided with a beveled gear-wheel N meshing with a beveled gear-wheel N, mounted on a shaft N carrying a pulley N, driven by a belt from the hoisting-engine, so that the governor'N is actuated as long as the engine is in motion, the arms N of the governor moving outward into an open position 'while the engine is running at the usual rate of speed and so as to engage the arms H in case the latter are moved upward by the nut I and in case the engine is not stopped at the time the cage nears the landing. On the shaft N is also secured a disk 0, provided on its under side with lugs 0, adapted to engage the tripping-arms H in case the engine has its speed slackened, and the arms N are in an inward position, as shown in Fig. 1, so that the arms H on rising come in contact with the said lugs O, which latter impart a turning mo tion to the tripping-arms H, so as to move the same off their supports J. The lower end of each screw-rod I is provided with a beveled gear-wheel I in mesh with a beveled gear wheel 1 mounted on a shaft 1 connected by a positive means with the hoisting-drum, so that the said shaft I and the screw-rod l are rotated in unison with the movement of the hoisting-cable for the cage. As shown in Fig. 1, the shaft I is provided with a sprocketwheel I, connected by a sprocket-chain with a sprocket-pulley on the hoisting-drum shaft. (Not shown.)

The operation is as follows: The screw-rod I, nut I, and the frame carrying the tripping-arm H are so arranged relative to the hoisting-cable and cage that when the cage nears the landing in the mine the arm H is in an uppermost position to be engaged by the governor-arms N in case the speed of the engine has not been checked by the operator. Now when the cage is at the bottom of the mine the nut I is in a lowermost position on the screw-rod I, and when the engine is started to wind up the hoisting-cable to lift the cage then the screw-rod I is turned and the nut I is caused to travel upward on the said screw-rod to lift the frame supporting the arm H, the latter resting on the supports J, attached to the rods K of the said frame, as previously explained. Now when the cage nears the landing and the speed of the engine is not checked the governor-arms N strike the arm H and turn the same SUfll' ciently to move the ends thereof off the supports J, whereby the arm is caused to slide downward on the smooth end of the screwrod 1, and the arms in descending move in an engagement with the arms B, so as to carry the same along and thereby pull the slide-rods B, the slide cross-heads B and loop 0 in the same direction to impart a swinging motion to the arm D in the direction of the arrow Ct to trip the spring-pressed roller G and to cause the links F and F to actuate the brake mechanism and reversing-lever and to close the admission valve for the steam to the hoisting-engine, so that the engine is stopped before the cage reaches the landing. In case the speed of the engine is checked by the operator in charge before the cage reaches the landing the arms N do not affect the arms H and the latter are carried past the arms N in an upward direction to be finally engaged by the lugs O on the disk 0, secured on the governor-shaft N The lugs 0 now impart a turning motion to the tripping-arm H, so as to throw the same off the supports J and to cause the arm to actuate the slide and loop 0, as previously explained, to close the admission-valve and apply the brake and reversing-lever to stop the cage at the time it reaches the landing.

In order to take up the shock incident to the tripping-arm H striking the curved arm LOO B of the slide, 1 provide the rods B with buffers B on the top of the cross-head 13*, so as to cushion the parts connected with the slide and arm II.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent 1. In an automatic safety-stop forhoistingengines, a screw-rod driven from the engine in unison with the movement of the hoisting cable or cables, a nut mounted to travel on the said screw-rod, a frame adapted to be raised by the said nut and provided with a support, and a weighted arm adapted to be turned and normally resting on the said support, a governor,the said arm being adapted to be turned by said governor, and means whereby the weighted arm when released from said support will close the admission-valve and actuate the brake mechanism and reversing-lever, substantially as shown and described.

2. In an automatic safety-stop for hoistingengines, aweighted tripping-arm, a governor,

the tripping-arm being adapted to be engaged by the governor to turn the arm and move it from its normal support, and a mechanism adapted to be actuated by the said arm when the arm is released from its support, such mechanism being connected with the admission-valve for the hoisting-engine, the brake mechanism and reversing-lever,substantially as shown and described.

3. In an automatic safety-stop for hoistingengines, a revoluble disk having lugs and driven by the hoisting-engine, a tripping-arm adapted to be engaged by the said lugs for turning the arm, means for supporting and lifting the arm in unison with the cage, and a mechanism adapted to be actuated by the said arm and connected with the admissionvalve for the engine, the brake mechanism and reversing-lever, substantially as shown and described.

4. In an automatic safety-stop for hoistingengines, a screw-rod driven from the engine in unison with the movement of the hoisting cable or cables, anut mounted to travel on the said screw-rod, a frame adapted to be lifted by the said nut and provided with a support, a weighted arm mounted to turn on the said screw-rod and normally resting on the said support, means actuated from the hoistingengine and adapted to turn the said arm to move the latter oh": its support, and a leverand-link mechanism connected with the said frame and connected with the admissionvalve of the hoisting-engine, the brake mechanism and the reversing-lever, substantially as shown and described.

5. In an automatic safety-stop for hoistingengines, a rock-shaft connected with the admission-valve and the brake mechanism and provided with arms for supporting a frame, a

curved arm held on the said shaft and formed at its free end with a curved seat, a roller normally resting in the said seat, and a spring connected with the rod in which the said roller is journaled, so that when the said arm is caused to swing the roller moves out of the seat and the arm is relieved of the pressure of the spring, substantially as shown and described.

6. In an automatic safety-stop for hoistingengines, a cushioned slide connected with the admission-valve, the brake mechanism and reversing-lever, an arm adapted to engage the said slide to move it and actuate the said parts, a frame having a support, means for raising the frame to carry the said arm along, and means for disengaging the said arm from the frame and permitting the arm to drop onto the said cushioned slide, substantially as shown and described.

7 In an automatic safety-stop for hoistingengines, a slide connected with devices for operating the admissionvalve, the brake mechanism and reversing-lever, the said slide comprising rods, arms connecting pairs of rods with each other, a cross-head for the said rods and connected with the said devices, and buffers for the rods and cross-head, substantially as shown and described.

8. In an automatic safety-stop for hoistingengines, the combination of a weighted tripping-arm, a support adapted normally to hold said arm, a governor capable of throwing the. tripping-arm from the said support, and means for transmitting controlling movement to parts of the hoisting-engine, such means being engaged and operated by the arm when said arm is released from its support.

9. The combination of avertically-extending revoluble screw, a nut in which said screw is turned whereby the nut is moved vertically on the screw, a carriage moved vertically with the nut, a tripping-arm supported by the carriage, a governor capable of throwing the tripping arm from said support, and means for transmitting controlling movement to parts of the hoisting-engine, such means being operated by the tripping-arm when the tripping-arm is thrown by the said governor.

10. The combination of a vertically-movable carriage, a tripping-arm normally supported by the carriage, a governor capable of throwing the trippingarm from said normal support, and means for transmitting controlling movement to parts of the hoistingengine, such means being engaged by the tripping-arm as the tripping-arm is thrown by the governor.

JAMES E. RICHARDS.

Witnesses:

A. T. STREETER, A. W. KERR.