US402257A - Hoisting-engine - Google Patents

Hoisting-engine Download PDF

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US402257A
US402257A US402257DA US402257A US 402257 A US402257 A US 402257A US 402257D A US402257D A US 402257DA US 402257 A US402257 A US 402257A
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lever
cylinder
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16DCOUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/08Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as an encircling band extending over approximately 360 degrees
    • F16D49/10Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like shaped as an encircling band extending over approximately 360 degrees mechanically actuated
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/15Intermittent grip type mechanical movement
    • Y10T74/1526Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1529Slide actuator
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/15Intermittent grip type mechanical movement
    • Y10T74/1526Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1529Slide actuator
    • Y10T74/1531Multiple acting
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/15Intermittent grip type mechanical movement
    • Y10T74/1526Oscillation or reciprocation to intermittent unidirectional motion
    • Y10T74/1553Lever actuator
    • Y10T74/1555Rotary driven element
    • Y10T74/1556Multiple acting
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/15Intermittent grip type mechanical movement
    • Y10T74/1558Grip units and features
    • Y10T74/1565Gripper releasing devices
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00Machine element or mechanism
    • Y10T74/15Intermittent grip type mechanical movement
    • Y10T74/1558Grip units and features
    • Y10T74/1587Grip features
    • Y10T74/1589Driving band

Description

(No Model.)

4 Sheets-Sheet 2. E.. D. LEAVITT. Jr.

HOISTING ENGINE.

No. 402,257. Patented Apr; 30, 1889;

lllllllllllflillk u. unnnnfi m|| Invenlor Erasmusj W LMOML 4 .Leavill,Jn, by .flllorney,

r1 PETERS. mowulm w, war-mm. no

4 Sheets-Sheet 4. E. D.LEAVITT, Jr.

(-NO Modem HOISTING ENGINE. V NO. 402.257, Patented Apr. 30, 1889.

N- PETFRS. Phnlulilhbgnpher. Washingmn, D. C,

Invenlor': I I.

UNITED STATES PATENT OFFICE.

ERASMUS D. LEAVITT, JR, OF OAMBRIDGEPORT, MASSACHUSETTS.

HOlSTlNG-ENGINE.

SPECIFICATION forming part of Letters Patent N0. 402,257, dated April 30,1889.

Application filed October 12, 1888. Serial No. 287,953. (No model.)

To all whom it may concern.-

Be it known that I, ERAsMUs D. LEAvIrr,

J r., of Cambridgeport, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Hoisting-Engines, of which the following,

taken in connection with the accompanying drawings, is a specification.

in mining communities where steam hoisting-engines are used for the purpose of raising ore from the mines it is frequently found desirable to transmit to the hoisting-drum an intermittent motion which shall be entirely independent of any motion which may be transmitted from the main engine; and it is to accomplish this result which is the object of this invention, which consists in certain novel features of construction, arrangement,

and combination of parts, which will be read ily understood by reference to the description of the drawings and to the claims to be hereinafter given.

Of the drawings, Figure 1 represents an elevation of my improved device for imparting tothe hoisting-drum an intermittent rotary motion and showing said drum cut in section. Fig. 2 represents a central vertical longitudinal sectional elevation of the fleeting-engine of said device. a similar sectional elevation of the fleetingstrap cross-head and its bed-plate, the fleeting 7 represents a transverse sectional elevation of the same, the cutting-plane being on line 2 2 on Fig. 5. Fig. 8 represents a transverse sectional elevation of the same, the cuttingplane being on line 3 3 on Fig. 5. Fig. 9 represents. a sectional elevation of a portion of one of-the sliding pipes and its packing. Fig. 10 represents a transverse sectional elevation of the fleeting-strap cross,head.- Fig. 11 rep- Fig. 3 represents resents a section of the guide for the fleetingengine cross-head. Fig. 12 represents a section of the guide for the fleeting-strap crosshead. Figs. 13 and 14 represent details of the fleeting-strap end connections. Figs. 15, 16, and 17 represent, respectively, a rear ele' vation, a side elevation, anda front elevation of the hydraulic valve-gear. -Fig. 18 represents a sectional elevation of the Valve stand and chest, the cutting-plane being on line 4 4 on Fig. 20. Fig. 19 represents a horizontal section of the same, the cutting-plane bein on line 5 5 on Fig. 20. Fig. 20 represents afront elevation of the upper portion of the valvestand. Fig. 21 represents a sectional elevation, the cutting-plane being on line 6 6 on Fig. 16.

In the drawings, A is the bed-plate, upon which is secured the cylinder B, in which is mounted the piston B to. which is attached the piston-rod B the outer end of which is fastened securely to the trunnion-block C by means of the key a, whichblock O is provided with the trunnions a at, extending from opposite sides thereof into suitable bearings in the side bars, 0 C, of the fleeting-engine cross-head. The side bars, 0' C, are secured together by the transverse bars 0 0 the ends of which project beyond said side bars, 0 C, into'the open slots a a formed in the guides 0 so that said frame 0' O C C may be reciprocated back and forth therein as the piston B is reciprocated within the cylinder A.

To the side bars, 0' C, and above the transverse bars 0 C are secured the two cylinders D and D, the former of which is somewhat larger than the other in diameter. The ends of these cylinders which are toward each other are provided with suitable openings to receive the plunger D which is adapted to reciprocate within said cylinders, which are securely tied together at their upper sides by the tie-rod b.

- To the plunger D is pivoted at b the link 19 to the free end of which is pivoted the upper end of the lever E, which is mounted upon the fulcrum-pin c, secured in the side bars, C C, and which extends beyond said fulcrum-pin c, and has pivoted to its lower end one end of the connecting-'rod'F, the op-- posite end of which is pivoted to the lower end of the lever F, which is mounted upon the fulcrum-pin d, secured in the cross-head G, which is provided with laterally-projecting lips d, which extend into the grooves (Z formed in the guides G upon either side of said cross-head G.

The fulcrum-pin c is connected to the tulcrum-pin d by means of the rod H, so that the cross-head G will reciprocate whenever the side-bars, C C, with the pin c, are reciprocated; but the grooves d are made curved and concentric to the axis of the hoistingdrnm, which is located immediately above the center of said guides G, as shown in Fig. 1, so that when said cross-head G is reciprocated it will always remain the same distance from the axis of the shaft 1, upon which the hoisting-drum is mounted, only that portion of which is shown in the drawings which is known as the brake-wheel J, which forms a part of and conforms to all the motions of the hoistil'ig-drum.

To the upper end of the lever F is pivoted the link J, the opposite end of which is pivoted to the casting J secured to one end of the steel strap K in any well-known manner. The steel strap K passes nearly around the brake wheel J, and has secured to its other end another similar casting or end piece, K, to which is pivoted in a well-known manner the threaded bolt. K upon which is adjustably mounted the stirrup K, secured to the fulcrum-pin d.

The outer ends of the cylinders D and I) are provided, respectively, with the nozzles D and D into which the pipes L and L are secured, so that they will reciprocate with the cylinders D and D, the other ends of said pipes extending, respectively, into the cylindrical water-chambers M and M, formed in a suitable casting secured above said cylinder B.

The joints where the pipes L and L pass into the said chambers M and M may be packed in any well-known manner; but I prefer the packing shown in Fig. 9, in which 6 is a composition bushing, c is the leather packing, and is a nut to crowd the packing into place.

To the platform N, located above the fleeting-engine, is secured the stand N, to the front side of which is secured the valve-chest N in which are mounted the vertical valvestems g g, which operate the valves 9 g to open and close the ports in a well-known manner.

The inletpipe 71 communicates directly with the interior of the valve-chest N while the exhaust-pipe 71- communicates with the chamber 7L2 in the stand N, which chamber 7L2 is provided with the ports 71 its, which communicate with the interior of the valve-chest and are continually covered by the valves g g, so that the inlet-water is prevented from passing through the same without first passing through the fleeting-engine. Above the left-hand port 71, Figs. 19 and 30, is a port, '1',

which communi ates through the pipe t' with the back or left-hand end of the fleeting-engine cylinder, while below said port h is another similar port, i which communicates through the pipe 1' with the front or righthand end of said cylinder.

Above the right-hand port it is a port, 70, which communicates through the pipe k with the chamber M, which in turn communicates through the pipe L and nozzle D with the interior of the small clamp-cylinder D, while beneath said port h is located a similar port, k which communicates through the pipe a with the chamber M, from which the water may pass through the pipe L and nozzle D to the cylinder D.

Each of the valvestems g g is connected at its lower end by means of the links I l to the inner end of the lever l, which is pivoted at Z to the cross-head Z and the opposite end of which is connected by the link to the end of the lever Z, secured upon one end of the shaft 1, which is mounted in the stand Z, and has secured to its opposite end the hand-lever O, by which the valve may be operated to direct the water through the upper or lower port, as desired, all in a well-known manner.

The cross-head Z is mounted in the guide m, Figs. 16 and 21, which is secured to the platform N, while to the lower end of said cross-head is secured the upper end of the link m, the opposite end of which is mounted upon the pin m secured to the enlarged. end of the link-shaft m at a short distance from the center of said shaft m, which is mounted in a bearing in the bracket m and has secured. to its other end the lever 12, the outer end of which is connected by the rod 11 to the pantograph P, of the usual construction, which is hung from the bracket 0, secured to the under side of the platforn N, and which has its free end connected to the cylinder D, so that all motion of said cylinder will be transmitted through said pantograph to said connecting-rod n, the amount of movement, however, of said rod n being greatly reduced as compared with the movement of said cylinder.

The operation of my invention is as follows: The rightrhand lever O is first moved toward the frame N, (see Fig. 1,) thus raising the valve 9, so that the water may pass from the inlet-pipe h to the interior of the valvechest N 2 and from this chamber through the lower port, W, to the pipe through which it is carried to the chamber M, from which it passes through the pipe L and nozzle D"in to the interior of the cylinder D, thus forcing the plunger D toward the brake-wheel J, and moving the lever E about its fulcrum-pin c, and causing the connecting-rod F to move toward the fleeting-engine cylinder,which movement of the rod F is transmitted to the lever F, causing the same to move about its fulcrum (1, so that the endsof the fleeting-strap K will be brought nearer together, thus securely clamping said wheel J in an obvious IIO L into the chamber M, from which it passes through the pipe k to the port 70, along the valve 9 to the port 'h into the chamber W in the stand N, from which it is carried away by the exhaust-pipe h. The wheel J being securely clamped by the strap K, the lefthand lever O is moved toward the frame N,

thereby moving the valve g, so as to uncover the port 6 so that the water may pass through the same to the pipe i through which it is carried to the front or right-hand end of the fleeting-engine cylinder. \Vhile thecylinder B is being thus filled, the piston B is being moved to the left or away from the brakewheel J by the action thereon of the water being admitted to said cylinder from the pipe i As the piston B moves toward the lefthand end of the cylinder, the water contained in that end is forced out through the pipe ql to the port d, through which it passes along the valve g to the port 7L3 and the chamber 71.2, from which the water is carried away by the exhaust-pipe h. The piston B being connected by the piston-rod B to the side bars, 0 upon which the cylinders D and D are mounted, it is obvious that said cylinders, the pipes L and L, and the pin 0, mounted in the side bars, 0 G, will all conform to the reciprocating movements of the piston B, and since the pin 0 is oonnectedby the rod H to the pin d, mounted in the crosshead G, said cross-head G will also be reciprocated by the action of the water upon the piston B; but by virtue of the curvature of the guides G G, in which said cross-head G is mounted, said cross-head will of necessity travel in a path concentric with the axis of the shaft 1, so that the fulcrum-pin d will at all times remain the same distance from the rim of the wheel J. When said strap K is clamped to saidwheel J and said cross-head G is moved toward the cylinderB, it is obvious that said wheel J will be moved about its axis a distance equal or nearly equal to' the stroke of the piston B within the cylinder B. The movement of the cylinder Daway from the drum causes its motion to be transmitted through the pantographP to the rod '27, which in turn operates the lever '11, which turns in its bearing the shaft m so that the pin m will be lowered, which motion will be transmit-ted through the link m to the cross-head Z causing the same to assume a lower position. As the upper end of said cross-head Z? is pivoted to the lever l at 1 said lever Z is made to swing about the joint so that the free end of said lever Z is lowered sufficiently to cause the valve g to cover both the ports 't'and t'flwhen no more Water can be transmitted to either end .of the fleeting engine cylinder, and consequently the movement ,of the piston B and the parts secured thereto will cease, and as said cylinder is filled with water upon either side of said piston it will be locked, so that it cannot move in either direction. The length of stroke of said piston, and consequently the amount of move ment of said wheel J, may be predetermined by the movement of the lever O. For instance, supposing the piston B is at the righthand end of the cylinder B and it is desired to move it into the position in which it is shown in the drawings, the operator will move the right-hand lever O sufficiently to clamp the wheel J, and then he will move the lefthand lever 0 into the position in which it is shown in Fig. 16, and in which position it will 'be locked to the frame r by the locking device 4, which may be of any well'known construction. As has already been described, the water will pass through the pipe 1' to the front end of the cylinder B, causing the piston B to move away from the drum; but as soon as the cylinder D has moved into the position shown in the drawings its motioir willhave been transmitted through the automatic stopping device to cause the cross-head to be lowered and operate the lever l and the valve g, so that they will assume the positions shown in the drawings, when the movement of said piston B will cease, as has already been described. This is accomplished by virtue of the fact that as soon as the cylinder D begins to move toward the cylinder B or away from the drum the cross-head l and valve 9 will begin to be lowered, and if the valve 9 is in one case only moved by the lever O a short distance, so that it but partially uncovers the port i while in another case said valve is moved far enough to entirely uncover said port 1' it follows that the valve g in the'first instance, having a shorter distance to travel, will cover both ports 1' and i sooner than it would cover the same ports in the latter case, where the valve must travela longer distance before the water is cut off from passing to the cylinder B. By virtue of this fact it is obvious that any length of stroke of the piston B may readily be determined, and if it is desired that the piston should travel the entire length of the cylinder B the operating-lever is moved as far to the rear as possible, which will cause the valve g to be moved upward as far as it can go, so that the said valve will not be able to again cover both the ports 2' and 2' until the piston B has moved to the rear end of the cyilnder B. a

.In order to release the wheel J and move the parts back to their former positions preparatory to another grip-and-pull operation, the operator moves the right-hand lever toward the left-hand side of Fig. 16, thus uncovering the upper port, it, and allowing the inlet-water to pass through the same into the pipe through which it will be carried to the chamber M, and thence through the pipe 1/ and nozzle D to the interior of the cylinder D, thus forcing the plunger D toward the cylinder D and releasing'the clamp of the strap K upon the wheel J, the water in the cylinder D being forced out through the pipe L, the chamber M, the pipe k the port 7:7 along the valve 9 to the port 7L3, into the chamber 71 and away by the exhaust-pipe h. The operator will then move the left-hand lever toward the left side of Fig. 16, thus lowering the valve g, so as to uncover the port- 1 so that the inlet-water may pass through the same into the pipe 'i, by which it is conveyed to the back end of the cylinder B, thus forcing the piston B toward the drum, and with said piston the cylinders D and D, which movement will operate the pantograph P, the connecting-rod n, the lever 12, the shaft m the link 21!, and the cross-head I to again raise the end of the lever Z and the valve g, so that said valve will again cover both of the ports 1' and It is obvious that in this operation the strap K will be simply slipped around the wheel J without moving it about its axis.

It is evident that by clampingthe wheel J and allowing the cylinder B to remain filled with water, with the valve 9 over the ports 1' and this device may be used as a brake.

\Vith the foregoing it is believed that the operation of my invention will be readily understood without further description, while its advantages are obvious.

lVhat I claim as new, and desire to secure by Letters Patent of the United States, is-

1. In combination with the brake-wheel of a hoisting-drum, a reciprocating cross-head, a lever pivoted to said cross-head, a strap encircling said wheel and connected at one end to said cross-head and at the other end with one end of said lever, and means for moving said lever in one direction to clamp said strap to said wheel, so that said wheel will move about its axis with said cross-head and in the opposite direction to loosen the grip of said strap upon said wheel.

2. In combinationwith the brake-wheel of a hoistii'ig-drum, a cross-head reciprocating in a path concentric with the axis of said wheel, afulerum-pin mounted in said cross-head, a lever mounted upon said pin, a strap encircling said wheel and connected at one end to said cross-head and at the other end with one end of said lever,a reciprocating frame, a leverpivoted to said frame, arod connecting the lowerends of said levers, another rod connecting said cross-head and said sliding frame, two cylinders secured to said reciprocating frame, and a reciprocating plunger mounted in said cylinders and connected with the upper end of the lever pivoted to said reciprocating frame.

In combination with the brake-wheel of a hoisting-drum, a fixed cylinder, a reciprocatin g piston mounted within said cylinder, a cross head or frame mounted in suitable guides, a rod connecting said cross-head with said piston, a lever mounted upon said crosshead, an engine-cylinder mounted upon and movable with said cross head or frame, a piston fitted to said cylinder and arranged to be reciprocated therein and connected to one end of said lever, a second cross-head mounted in guides located beneath said brake-wheel and curved to an arc of a circle concentric to the axis thereof, a rod connecting said two crossheads, a lever pivoted at or near the center of its length to said second cross-head, a brake-strap surrounding said brake-wheel and connected at one end to said second crosshead and at its other end to one end of the lever carried by said cross-head, and a rod connecting the other end of said lever with the lever pivoted to the first-mentionedcross head or frame.

4. In combination with a fixed cylinder, a piston reciprocating in said cylinder, a frame adapted to slide in suitable guides, a rod connecting said piston with said frame,'two cylin ders secured to said frame in axial line with each other, a plunger mounted in said cylinders and extending from one to the other, a casting secured to said fixed cylinder and provided with two parallel water-chambers, a pipe secured to one of said sliding cylinders and extending into one of said water-chambers, another pipe secured to the other sliding cylinder and extending into the other water-chamber, and pipes leading to the outer ends of said Water-chambers to admit the water thereto or exhaust it therefrom, as the case may be, valves for controlling the flow of water to or from said water-chambers, a two-armed lever pivoted to said reciprocating frame and connected at one end to said plunger, a brake-wheel, a second cross-head located beneath said brake-wheel, curved slides for guiding said second cross-head in a path eoncentric to the axis of said brake-Wheel, a second two-armed lever pivoted to said second cross-head, a brake-strap surrounding said brake-wheel, a rod connecting said recipro-v cating frame and second cross-head, and a rod connecting the lower ends of the two twoarmed levers.

5. In combination with the brake-wheel of a hoisting-drum, a cross-head reciprocating in a path concentric with the axis of said wheel, a fulcrum-pin mounted in said cross-head, a lever mounted upon said pin, a strap encircling said wheel and connected at one end to said cross-head and at the other end with one end of said lever, a reciprocating cross head or frame, a lever pivoted to said frame, a rod connecting the lower ends of said levers, another rod connecting said cross-head and said reciprocating frame, two cylinders secured to said reciprocating frame in axial line with each other, a reciprocating plunger mounted in said cylinders and extending from one to the other and connected to the upper end of the lever pivoted to said reciprocating frame, a fixed cylinder, a piston mounted in said fixed cylinder'and adapted to reciprocate therein, and a rod connecting said piston to said reciprocating frame, so that said frame, 7

said cross-head, and said'piston will all move in unison. 1

6. In combination with the brake-wheel of a hoistinged'ru'm, a reciprocating frame, two cylinders secured to said frame in axial line with each other, a plunger mounted in said cylinders and extending from one to the other, a lever pivoted to said reciprocating frame and connected at one'end to said plunger, and pipes connecting with theouter ends of said cylinders to admit water to reciprocate said plunger, across-head located beneath said brake-wheel and arranged to be reciprocated in a path concentric to the axis of said wheel, a two-armed lever pivoted to said cross-head, a brake-strapsurrounding said brake-Wheel and pivoted at one end to said cross-head andat its other end to one end of the lever carried by said cross-head, and'a rod connecting the other end of said lever with the lower end of the two-armed lever carried by said reciprocatingframe.

7. In combination with the brake-wheel of a hoisting-drum, a reciprocating frame, a cylinder and piston for transmitting motion to said reciprocating frame, a valve-seat provided with an exhaust-port and another port upon either side of said exhaust-port, pipes connecting said outer ports with the opposite ends of said cylinder, a valve adapted to cover all of said ports or either two of them, as desired, a valve-stem for operating said valve, a lever connected at one end to said valve-stem and at the other end to a fulcrumpin which is adapted to'be raised or lowered at the will of the operator, a sliding crosshead pivoted at one end to said lever, and a series of links and levers interposed between said reciprocating frame and said crosshead, by which, when said frame is moved away from the hoisting-drum, said cross-head will be moved so that all the ports in the valveseat will be closed by said valve.

8. Iii-combination with the brake-wheel of a hoisting engine and a gripping or clamping device constructed and arranged to be intermittently clamped to and released from said wheel, a fixed cylinder, a piston working in said cylinder, a reciprocating frame or cross-head connected by a piston-rod. to said piston, a pair of differential cylinders mounted upon and movable with said frame, a differential plunger fitted tosaid cylinders and extending from one to the other, a lever mounted on said frame and connected at one end to said difierential plunger and at its other end to the gripping device, a pair of.

fixed water-chambers, pipes leading from the interior of said water-chambers to the opposite ends of said differentialcylinders, a valvechamber provided with two sets of ports leading therefrom and two valves to cover said ports, pipes leading from the two outer ports of one set to the opposite ends of the fixed cylinder, 'pipes'leading from the two outer ports of the other set to the interior of the water-chambers, a cross-head connected at one end with the stem of the valve that controls' the flow of water to the fixed cylinder,

and a system of links and rods connecting thejothe'r end ofsaid cross-head to one of said differential cylinders or to the frame on which said cylinder is mounted.

9. The combination of the fixed cylinder B, the piston B, the piston-rod B areciprocating cross head or frame connected to said piston-rod,the differential cylinders D and D,

mounted upon and movable with said reciprocating frame, a differential plunger fitted to 'said differential cylinders and extending from one to the other, the fixed water-chambers M and M, the pipes L and L, the valvechamber N the two valves g g, the ports 2', 1 h 7?, lo, and k pipes connecting ports i and v? with the opposite ends of the cylinder B, pipes connecting the ports 7t and k with the water-chambers M and M, respectively, the valve-rods g g, hand-levers 0, means for lockin'g one of said'levers in any desired position, links Z and Z levers Z and Z the cross-head F, the pantograph P, the crank-shaft m levern, and rod n, all constructed, arranged, and operating substantially as described.

10; In combination with the brake-wheel of a hoisting-drum, a reciprocating cross-head, a

strap encircling said wheel and secured at one end to said cross-head, a frame reciprocating in unison with saidcross-head, a lever for causin g said strap to grip the said wheel when said cross-head is at one end of its movement and to release the same when vat the other end of its movement, a pair of difierential cylinders mounted upon and movable withsaid frame, a differential plunger fitted to said cylinders and extending from one to the other, a twoarmed lever pivoted to said frame and connected at its upper end to said plunger, a rod connecting the other end of said lever to the strap-clamping lever, a valve-seat provided with three ports in line with each other,

a fixed cylinder, a piston adapted to reciprocate within said cylinder and connected with said frame, pipes connecting the ends of said cylinder with two of the ports in said valveseat, a lever for operating said valve to uncover either of the outer ports and allow water to pass into either'end of said cylinder and cause the piston, frame, and cross-head to be moved toward or from said drum, as may be desired, and a system of links and levers connecting said reciprocating frame with the valve, and so arranged that it will cause said valve to cover said ports when said frame has moved a predetermined distance and prevent all further movement in that direction. In testimony whereof Ihave signed my name to this specification, in the presence of two subscribing witnesses, on this 8th day of October, A. D. 1888.

ERASMUS D. LEAVITT, JR. Witnesses:

FRANCIS U: DEAN,

GEORGE E. WHrrNEY.

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* Cited by examiner, † Cited by third party
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US3557911A (en) * 1967-11-23 1971-01-26 Automotive Prod Co Ltd Band brakes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3557911A (en) * 1967-11-23 1971-01-26 Automotive Prod Co Ltd Band brakes

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