US1971651A

US1971651A - Hydraulic hoist control

Info

Publication number: US1971651A
Application number: US513449A
Authority: US
Inventors: Howard F Gorsuch; Dupre Philip
Original assignee: Individual
Current assignee: Individual
Priority date: 1931-02-04
Filing date: 1931-02-04
Publication date: 1934-08-28
Anticipated expiration: 1951-08-28

Description

1934. I H. F. GORSUCH ET AL 3 L6 HYDRAULIC HOIST CONTROL Fil-ed Feb. 1951 (1 H01 um:

Patented Aug. 28, 193 4 umrao s'rArss PATENT; OFFICE masonic nors'r comer.

Howard F. Gorsnch and Philip Dnpre, Mansfield, Ohio Application February 4, 1931, Serial No. 518,449

6 Claims. (Cl. 138-8) This invention is directed to control means for hydraulic motors, particularly where such motors are used as a means for operating dump bodies or for like operations.

In the use of hydraulic motors for operating dump bodies, such motors are supported on the chassis o! the vehicle as a general arrangement, and the control means therei'or is located adjacent the driver's seat, to provide for full control 01' the motor and accurate government and 0peratlon oi the dump body. Such hydraulic motors usually include a pump to be driven tor the power circulation of the motive fluid, and a valve having several operative positions: one to permit circulation of the motive fluid for power purposes in and during the operation of the pump; a second, wherein the circulation is arrested and in tact prevented, for holding the motor in any desired operated position; and a third, during which provision is made for Iree I reverse circulation of the motive fluid, to permit the motor parts to return to normal positions. In the first position of the valve, the pump is in "operation, while in the second and third posivolves means for connecting the motor shaft for actuation, and means for arranging the valve in the selected'position. These controls have heretoiore been provided in the use of two independent levers, one Ior the pump operation and the other for the valve control. The use of two levers mrzes tor contusion in operation, and obviously tends to a liability or improper operation and consequent damage.

The essential feature of the present invention is the provision of a control means for such hydraulic motors, involving a single lever, capable of being moved to a plurality of positions, and controlling the operation of the pump-shaft and of the valve simultaneously, the pump-shaft control being capable of selective combination with the lever at will, thus permitting a single lever being operated to set the pump in operation and open the valve to permit power circulation or the motive fluid; interrupt the operation oi! the pump and move the valve to a position to prevent motive fluid circulation, and thus hold the parts in any desired position of rest; or to interrupt the pump operation and move the valve to permit a reverse circulation of the motive fluid, to thus permit motor parts, and connected elements to return to normal positions.

The provision of a single lever avoids possibility of confusion in operation, insures accuracy of control, and makes for emciency and certainty under all conditions.

The invention will be described in connection with the accompanying drawing, in which:

Fig. l is a side view, illustrating the singleiever control, the hydraulic motor being shown in outline, and a portion only of the vehicle being shown.

Fig. 2 is a horizontal sectional view through the powertake-ofl.

Fig. 3 isa rear elevation of the operating lever.

Fig. 4 is an enlarged broken view, showing the lever and connected parts in each of its. several positions. The hydraulic motor control or this invention, as illustrated, includes a single lever provided with a link-control bar, which bar is aclectively operated to govern the operative connection or the lever with the power take-oi! for the operation 01' the motor pump, the lever proper being connected with the control valve for the motor for operation of such valve in all movements or the lever. Thus the lever, through the selective operation of the link-control rod, may be made to connect the power take ofl, for

the operation of the pump and simultaneously set the valve, or control the setting of the valve independently of the power take 011' connection.

In the preferred form of detail, the invention includes a lever 1, preferably iulcrumedat 2, on a fulcrum-rod removably secured to a casing 3, forming an offset from the usual vehicle transmission 4. A pump shaft 5, leads from the easing 3, and within the latter is provided with a sliding gear 6, capable of being moved into or out of mesh with an appropriate motor-driven gear 7 or such transmission, to thereby operate the'pump shalt at will.

The gear 6, which is of course held against other than a sliding movement on the pump shalt, is provided with the usual annular channels 8 to receive yoke arms 9, extendingirom a stub shaft 10, slidable in the casing 3, and extending beyond such casing, as at 11. Obviously, sliding movement of the shaft 10, will move the gear 6 into and out of mesh with the motor driven gear 7, and thus control the operation of the pump shaft, and thereby the pump of the hydraulic motor.

The lever 1 is formed with an enlargement in which is provided a longitudinally-ranging slot 12. A link 13 is pivotally connected to the projecting end of the shaft 10, and passes loosely 7 through the slot 12. That portion of the link passing through the slot is reduced in vertical dimensions to provide a shoulder 14, and the free terminal of the reduced portion beyond the lever is laterally thickened, as at 15, to provide for connection with the link-control lever, and to constitute a stop for engagement by the lever 1 in movement in one direction. A pin or bolt 16 is passed through the lever, bridging the slot 12, and designed to cooperate with the shoulder 14 of the link 13 in the movement of the lever in a direction opposite that serving to engage the stop 15.

A control rod 1'7 is loosely connected to the stop 15, and extends vertically of the lever 1, being connected adjacent the handle of such lever to a finger-lever control plate 18, pivotally supported on the lever 1, and having a finger extension 19, convenient to the fingers of the hand grasping the handle of the lever 1.

The improved lever control is to be used in connection with any hydraulic hoist involving a hydraulic motor having a pump for the power circulation of the motive fluid, and a valve for controlling such circulation. These details, not being important in connection with the present invention, require no illustration herein, and such motor is indicated in outline at 20, the valve operating connection being indicated at 21.

A reach rod 22 is connected to the lower end of the lever 1, and to the valve operating connection 21, so that in each movement of the lever 1 the valve is operated. Of course it is to be understood that the pump-shaft, or other motor pump drive and also the reach rod and valve connection are designed to be particularly arranged or made up so as to accurately accommodate themselves to the particular type of pump and valve and the particular arrangement and location of the hydraulic motor with which the improved control may be employed. Thus under certain conditions, it may be desirable to reverse the function of the reach rod from that shown, wherein the fulcrum of the lever, now shown at 2, may be disposed at the lower end of the lever and the reach rod connected to the lever above such fulcrum. The details of the arrangement beyond the lever are not material, so long as provision is made for driving the pump and operating the valve.

In the arrangement described and shown, when the lever 1 is moved into the position indicated at A in Fig. 4, the stub shaft 10 is moved through engagement of the lever and stop 15 to cause engagement of the sliding gear 6 with the transmission gear 7, and the pump of the hydraulic motor 20 is set in operation. At the same time,

the movement of the lever 1 has, through the this movement, the pin 16 of the lever engages the shoulder 14 of the link 13, and; moves the stub shaft 10 to disengage the gears 6 and 7. The pump is thus cut ofl from its power, and the reach rod has moved the valve to a position to cut off circulation in the hydraulic motor, and the parts of the motor, and of the operated element are held at rest. That is, if a dump body is being operated, the dump body is held against further movement, and it is of course apparent that this holding of the dump body may take place at any position of such body, either fully raised or at any intermediate stage. However, when returning the parts to normal positions, that is in the case of a dump body, lowering such body onto the frame, it is necessary to again operate the valve to a new position, one permitting a very open reverse circulation of the motive fluid, and this of course, without operating the pump. The lever, to secure this result is moved into position C of Fig. 4, causing the reach rod to properly set the valve. As the gear 6 should not be moved during this lever movement, the finger extension is operated simultaneously with the movement of the lever, with the effect to cause the link-control rod 18 to raise the line 13, until theshoulder 14 thereof clears the pin 16. The movement of the lever l to the new position C thus does not affect the power drive in any particular.

The improved construction provides a single lever for all necessary controls of the hoist. There is no possibility of any confusion either in use or control where but a single lever is provided, and thus efliciency and certainty of operation and control is assured. The lever is preferably arranged immediately adjacent the drivers seat, so that, with thknowledge that but a single lever hasto be manipulated, and this lever convenient to his reach, there is little likelihood that error will arise in either the proper or desired operation.

While primarily designed for the control of hydraulic motors for. operation of dump bodies, it

is apparent that the invention is equally applicable to hydraulic hoists of all types and for all purposes, where a pump for the motive fluid and a valve for the control of the circulation of this fluid is a necessary part of the operating mechanism.

Having thus described the invention, what is claimed as new, is:-

1. A hydraulic hoist control for use with hoists of the type including a motor, a pump, and a valve, including a single lever capable of three operative positions, valve-control connections operative in each of said three lever positions, pumpcontrol connections interconnected with the lever in two such lever positions, and manuallyoperable means for relieving the pump-control connections from lever influence in lever movement to such third position.

2. A hydraulic hoist control for use with hoists of the type including a pump and a control valve, including a lever movable to any one of three operative positions, pump-control connections interconnected with the lever and responsive to movement of the lever to either of two of such three operative positions, manually operative means for moving such pump-control connections beyond lever influence during movement of the lever to the third of such positions, and valvecontrol connections responsive to lever movement in each of said three positions.

3. A lever for the control of a pump and valve of a hydraulic hoist, said lever being mounted for movement to any one of three positions, pump-control connections interconnected with the lever, manually operable means for selective control of such connections during movement of the lever to two of such three positions, said means permitting movement of the lever to the third position without influence on said connections, and valve-control connections operative by the lever in lever movement to each of said three positions.

4. A lever for the control of a pump and valve of a hydraulic hoist, said lever being mounted {or movement to any one oi three operative positions,

pump-control connections, valve control connections. said Dump-control connections being interconnected with the lever and responsive to lever movement during movement of such lever to two such operative positions, means for adjusting said pump-control connections time of lever influence during movement of said lever to the third operative position, and means ior operating said valve-control connections during movement of the lever to each of said three operative positions.

5. A lever for the control of a pump and valve of a hydraulic hoist, said lever being mounted for movement to am one of three operative positions, valve-control connections responsive to lever influence in each of said three positions of the lever, pump-control connections interconnected with the lever and responsive to lever influence in movement of such lever to two of such three positions, and a manually operable element for shifting such pump-control connections beyond influence oi the lever during movement oi such lever to the third operative position.

6. A control lever mounted for movement to any one of three operative positions, a reach-rod control element connected to the lever and responsive to lever movement to each of said three operative positions, a power-take-ofl connection cooperating with the lever, and means for selectively operating said take-oil connection relative to the lever to interconnect said lever and takeoiT connection to cause the lever to operate said take-oil connection during lever movement to two of such operative positions and freeing such takeofi connection from lever influence during movement of the lever to the third such operative position.

HOWARD F. GORSUCH. PHILIP DUPRE.