US1926164A - Fluid operated cable winding device - Google Patents

Description

p 1933. G. G. MORlN Er AL FLUID OPERATED CABLE WINDING DEVICE 3 Sheets-Sheet 1 Filed Feb. 26. 1931 IN VEN TOR.

60R6 6.44081 [MILE J 64121.: ra/v ATTORNEY Sept. 12, 1933. G. G. MORIN ET AL FLUID OPERATED CABLE WINDING DEVICE a Sheets-Sheet 2 Filed Feb. 25, 1931 mm RRT m wMu M60 N [NJ F. a u 4 y B A TTORNE S.

Sept. 12, 1933. e. G. MORIN Er AL FLUID OPERATED CABLE WINDING DEVICE Filed Feb. 26, 1931 3 Sheets-Sheet 3 INVEN TOR.

650 6'. Mom/v J 62R: Era/v fM/LE A TTORJVEY l atented Sept. 12,

FLUID OPERATED CABLE WINDING DEVICE George G. Morin and Emile J. Carleton, Holyoke, Mass; said- Carleton'assignor to said Morin Application February 26, 1931 Serial No. 518,435

14: Claims. (01. 254-172) one object of the invention to produce a cable r Fig. 1;

winding mechanism capable of exerting great power when required and of very simple construction. A further objectis to provide a cable tensioning device for a dipper trip or tag line winder consisting of a rotary fluid pressure motor capable of being reversed by a load in excess of a predetermined amount together with a valve control for it capable of causing either a normal cable winding action or an increased pull upon the cable of considerable magnitude when required. Additional objects will appear from the following description and claims.

Referring to the drawings Fig. l is a fragmentary and somewhat diagrammatic side elevation of an excavating machine to which ourinvention is applied;

Fig. 2 is a bottom plan view'of the dipper showing the latch operatinginechanism;

Fig. 3 is a side elevation of parts shown in Fig. 4 is a central section of a control valve; Figs. 5 and 6 are diagrammatic views illus, trating the action of the fluid motor;

Fig. '1 is an end view of the fluid motor; Fig. 8 is a top plan view thereof; Fig. 9 is a section on an enlarged scale taken on line 9-9 of Fig. '7;

Fig. 10 is a section on an enlarged scale taken on line 10l0 of Fig. 8; and i Fig. 11 is a fragmentary section taken on line 1l11 of Fig. 9. While the fluid motor described herein has utility in other fields, such as a cable winding device for hoisting engines or a tag line winder for excavating machines using the clam shell type of bucket, it will be described herein in its preferred embodiment as a cable tensioning device for a dipper trip adapted for the scoop type of bucket. An excavating machine of this general r type has been illustrated in Fig. 1. The cab frame is indicated at15; the boomlG being pivoted to it at 1'7. Movable back and forth in the boom by the usual operating mechanism, which is not described herein as it does not specifically form a part of our invention, is a dipper stick 18 carrying a dipper 19 at its end. Thisdipper is controlled by the usual hoisting cables which are also not described since they do not constitute in themselves a part of the invention. The bottom of the dipper is pivoted in the usual way and is adapted to be held closed by a latch plate 2U cooperating with which is a slidable latch bar 21. A lever 22 pivoted to the bottom of the dipper is connected with the latch bar and is joined by .a chain 23 with a lever 24 pivoted upon the dipper stick and spring pressed toward the dipper. lhe dipper tripping cable 25 is attached to this latter lever and passes over a pulley 26 to a drum 27 mounted upon the frame 15 as will now be de-' scribed.

The drum 2'] is provided with flanges 28 held to itby a plurality of tie bolts 29. Each flange has a cylindrical extension 30 (Fig. 9) journaled upon a hub 31 formed upon a stator member 32. The hubs 31 are squared as at 32 (Fig. *7) to fit in frame members 33 bolted to the base 15 so that the stator is held against rotation while the drum is free to turn upon it. The drum is'pro vided with radial slots 34; (Figs. 9 and 10) mating with slots 35 (Figs. 9 and 11) in the flanges 28 to receive sliding blades 36 which there are four in the embodiment shown. Each blade is pressed towardthe'axis of the drum by a spring mecha} nism here shown as a pair of interengaging flat springs 37 and 38(Figs. 9 and 10), of which one has a tongue 39 at each end and the other has slots 4cm receive the tongues. At its inner end. each blade 36 is provided with a generallyv shaped notch ll (Fig. 10) connected by one or more holes 42 with the outer edge of the blade.v These holes permit the passage of steam and insure balanced steam pressure upon the inner and outer blade edges.

The external surface of the stator 32 is of generally eccentric form. It is composed of two cylindrical sectors 45 and 46 joined together by sectors 4'7 and 48 of generally spiral form. Opposite ends of the stator are formed with holes 50 and 51 (Fig. 9) forming, as shown, the exhaust and inlet passages for the fluid pressure medium. A diverging port 52 (Figs. 9 and 10) extends from the inner end of the hole 50 and a similar but oppositely directed port 53 extends from the m ner end of the hole 51.

The operation of the motor as thus far de scribed will now be considered, with particular reference to Figs. 5 and 6. In Fig. 5thefour blades 36 have been shown in the positions they occupy just prior to their transition between two adjacent sectors of the stator surface. The blade 36a is still upon the cylindrical portion 46 and the blade 360 is upon the cylindrical portion 45. Theblade 36a is subjectedjto no fluid pressure because access of such pressure to it is cut off by the mating of the surface 46 with the cylindrical Whatever pressure may be within the chamber formed between the stator and the interior of the drum is balanced as respects the blade 3612 since the fluid is free to pa s from one side to the other of it. The is in a similar condition upon the surface of the spiral as. The blade 360, however, is upon the cylindrical sector of least diameter. Fluid pressure entering through the port 53 can find no escape from the chamber except by pushing upo is blade 360, this pressure being indicated in the figure by a series of small arrows.

In Fig. 6 a slightly later conditionlhas been illustrated. The blade 36b now passed on to the cylindrical sector 45 and is receiving pres" sure as indicated. The blade 360 which was formerly receiving the pressure has passed on to the spiral sector 48 and is now subjected to a balanced pressure on account of the free passage of the fluid afforded by the port 52. It is obviousthat continuous rotation of the drum willbe secured by this mechanism, the lllllllll. power being supplied successively by the blades as they come on to the cylindrical portion 45 of the stator. It will be noted also that the notches ll in the inner edges of the blades produce a very rapid transition from one pressure to another as the blades pass between adjacent sectors but do not interfere with the effectiveness of the seal be tween the blades and the cylindrical sector 45. In fact the efiectiveness of the seal is enhanced by this structure as both edges of the blade are free to wear in independently. It will also be noticed that the motor can readily be turned backwards if the cable pull upon the drum is greater thanthe pressure exerted by t e steam upon the blades. In the operation of this device as a dipper trip this reverse rotation frequently occurs and is of great importance, as will be described below. v

The structure of the valvemechanism which controls the supply of fluid to tl e port 51 will now be described. A valve casing (Fig. i) is secured by a pipe 61 to the opening 51 in the stator. Within the casing is a cylindrical space 62. Pipes 63 and 64 are also seemed to the casing and are connected to th cylindrical space referred to by ports 65 and 65 respectively. Within the cylindrical recess in the casing body slides a hollow plunger?) preferably guided so that it may reciprocate without rotation by a pin and slot connection 71. At one side this plunger is provided with a port '72 adapted for registration in one position of the plunger with the port 65. A stem 73 projects from the plunger and passes through a disk or piston 74 movable ina cylin drical recess '75 formed in the casing and preferably of larger diameter than the cylindrical recess 62. Fluid pressure from the interior of the space 62 is communicated to the recess 75 by one or more ports '76 formed in the hollow plunger asindicated. A spring 77 compressed between the disk '74 and a cap '?8, and a spring 79 is compressed between the disk and a' washer 89 secured by a pin 81 to the stem 73.

The'valve as described. has two separate functions. In the first place it acts as an automatic valve maintaining a constant normal pressure supply to the motor. In the second place it serves as a manually operable valve admitting fluid under a higher degree of pressure to the motor when'desired; Fluid pressure is supplied to the pipe 63 at a pressure considerably higher than is desired for the normal operation of the motor when the latter is used for taking up slack in the cable. If there is no pressure in the motor, as is the case when the supply is first connected to the valve, the plunger 70 is shifted by the. spring 77 in a direction toward the top of Fig. 4 so that the port '72 registers with the port 65. In this position the edge of the plunger cuts oil the connection between the hollow chamber and the port 66. As the pressure. builds up it will gradually overcome the effect of the spring '77, and the plunger will be moved toward the position shown, in which a supply of fluid from the port 65 is cut off. -As long as the, motor-is running in a direction to take up slack the valve plunger will oscillate between these positions, admitting slugs of fluid to the chamber 62 and then cutting oil the supply. If, however, the dipper 19 is forced away from the cab frame so that the cable 25 will be forcibly unwound from the drum 27, the motor will be rotated in the reverse direction. In this motion it acts as a pump and would tend to build up pressure in the chamber 62. This of course causes further compression of the spring 7? and shifts the plunger '70 to a point where it uncovers the exhaust port 66.

If it is desired to cause a latch tripping tension in the cable the plunger '73 is depressed, as for example by a lever 85 pivoted at 86' to the frame in the manner indicated in Fig. 3. This forces the plunger 70 in a direction toward the top of Fig. cutting off the exhaust port and connecting the ports '72 and 65 together. It will be noted that this motion is wholly indel pendent of the position of the disk '74, and also of the pressure within the chamber 62, as pressure on the plunger is balanced by means of the ports 76 with the exception of the area represented by the rod 73. For thisreason the plunger can be 1 shifted with a relatively slight eilort irrespective of the amount of pressure admitted into the chamber. When the lever 35 is released the pres sure within'the chamber '62 immediately forces the plunger outwardly, uncovering the port 66 and permitting the pressure to drop until it has reached-the normal for which the spring '7'7'was set.

What we claim 1, A cableten-sioning device for dipper trips o1 tag line winders comprising a drum, arotary fluid pressure motor capable of being reversed by a load in excess of a predetermined amount connected to the drum, means for supplying pressure fluid under substantially constant pressure conditions 1 to the motor, and means under the control of the operator for supplying pressure fluid under substantially greater pressure conditions to the motor. r V

2. A cable tensioning device for dipper trips or tag line winders comprising a drum, a rotary fluid pressure motor capable of being reversed by a load in excess of a predetermined amount con nected to the drum, means for supplying pressure fluid under substantially constant pressure condil1 tions to the motor, means-under the'control of the operator for su plying pressure fluid under substantially greater pressure conditions'to the motor, and means for maintaining the pressure of said fluid substantially constant when the motor is driven backwards;

3. A cable tensioning device for dipper trips comprising a cable winding drum, arotary fluid pressure motor capable of being reversed by a load it excess of a predetermined amount connected to the drum, means for supplying pressure fluid to the motor under a pressure sufficient only to cause the drum to wind up slack in the cable, and means under the control of the operator for admitting pressure fluid to the motor under a pressure high enough to cause latch tripping tension in the cable.

4. A cable winding device comprising a bearing, a drum rotatable on thebearing, an eccentric stator secured against rotation on the bearing, the surface of the stator being divided into four generally equal segments of which two opposite ones are cylindrical and respectively of minimum and maximum radius and the intermediate ones are formed as curved surfaces joining the two cylindrical segments, the stator being provided with two ports one opening through each of the intermediatesegments, a plurality of blades slidable radially in recesses in the interior of the drum and spring pressed to bear on the stator, means for supplying fluid under pressure to one of said ports, and means for exhausting said fluid through the other of said ports.

5. A cable winding device as claimed in claim 4 in which the blades are formed with central notches upon their edges which contact with the stator.

6. A cable winding device as claimed in claim 4 in which the blades are formed with central notches upon their edges which contact with the stator, the notches being connected by holes with the opposite edge of the blade to eliminate unbalanced steam pressure upon the bladeedges.

'7. A cable tensioning device for dipper trips or tag line winders comprising a fluid pressure motor capable of being reversed by a load in excess of a predetermined amount, a drum coupled thereto, and a fluid control valve in the supply line of the motor comprising a housing having an inlet port, an exhaust port and a port connecting with the motor, and a spring pressed slide movable inthe housing and controlled in position by the fluid pressure therein, a decrease in pressure permitting spring actuated motion of the slide to a position uncovering the inlet port and an increase in pressure first shifting the slide to cover the inlet port and then to uncover the exhaust port.

7 .8. A cable tensioning device for dipper trips or tag line winders comprising a fluid pressure motor capable-of being reversed by a load in excess of a predetermined amount, a drum coupled thereto, and a fluid control valve in the supply line of the motor comprising a housing having an inlet port, an exhaust port, and a port connecting with the motor, a spring pressed slide movable in the housing and controlled in position by the fluid pressure therein, a decrease in pressure permitting spring actuated motion of the slide to a position uncovering the inlet port and an increase in pressure firstshifting the slide to cover the inlet port and then to uncover the exhaust port, and manually controllable means substantially unalfectedby the pressure in the housing to shift the slide to a position uncovering the inlet port and closing the exhaust port.

9. A cable tensioning device for dipper trips or tag line winders comprising a fluid pressure motor capable of being reversed by a load in ex cess of a predetermined amount, a drum coupled thereto, and a fluid controlled valve in the supply line of the motor comprising a housing having an inlet port, an exhaust port, and a port connecting with the motor,.a slide mounted in the housing and ported so as to permit fluid to pass through it, a piston slidable in a chamber formed inthe housing, and receiving fluid pressure through the port in the slide, a spring pressing against the piston, a stem projecting from the slide and extending through the piston, and a spring attached to the stem and bearing against" the piston so as to hold the slide normally against the piston but permitting operator-actuated motion of the slide independent both of the piston and of the pressure in the housing.

10. A cable winding device comprising 'a rotatably mounted drum, a stator mounted within the drum, and a plurality of blades radially movable within the drum, the surface of the stator being divided alternately into portions concentric with and portions eccentric with the drum, the

statorbeing provided with inlet and exhaust ports substantially coextensive with the eccentric portions of the stator surface, whereby fluid presprovided with radial vents, whereby fluid pressure upon all sides of the blades will be balanced during their radial movement.

12. A cable tensioning device for dipper trips or tag line winders comprising a drum, a fluid pressure motor connected to the drum to actuate it and capable of being reversed by a load on the drum' in excess of a predetermined amount,

means for supplying fluid pressure to the motor to drive the motor forwardly, andmeans automatically operable by the fluid pressure delivered by the motor when driven backwards by the drum for maintaining said pressure constant.

13. A cable winding device comprising a drum, a fluid pressure motor coupled'to the drum and capable of being reversed by a load on the drum in excess of a predetermined amount, means for supplying fluid pressure to the motor, automatically operable means for controlling said pressure and holding it normally constant, and a manually operable device for causing a substantially greater fluid pressure. to be supplied to the motor.

14. A cable tensioning device for dipper trips or tag. line winders comprising a cable winding drum, a rotary fluid pressuremotor connected to the drum and capable of being reversed by a load on the drum in excess of a predetermined amount,

means for supplying fluid pressure to the motor,

automatically operable means for controlling said pressure and holding it to an amount causing the motor to exert a tension on the cable sufiicient to maintain thecable in taut condition irrei spective of movements imparted to it from without the drunnand a manually operable device for causing fluid pressure of a substantially greater magnitude to be supplied to the motor.

GEORGEG. MORIN.

EMILE J. CARLETON.

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