US2523572A

US2523572A - Control for a plurality of fluid pressure motors

Info

Publication number: US2523572A
Application number: US37798A
Authority: US
Inventors: Gustav E Jansson
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1944-03-18
Filing date: 1948-07-09
Publication date: 1950-09-26
Anticipated expiration: 1967-09-26

Description

Sept 25, 1950 G. E. JANssoN 2,523,572

CONTROL FOR A PLURALITY 0F' FLUID PRESSURE MOTORS Original Filed March 1B, 1944 ,\\\\\\\\\\\\\\\\\\\\\\\\\\\\\Y i\\\\\\\\\\\\\\\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\Y=\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\v r r11/lll 111/1/11111/- /mo/ma/y) Patented Sept. 26, 1950 4CONTROL FOR A PLURALITY OF FLUID PRESSURE MOTORS Gustav E. Jansson, North Quincy, Mass., assignor to Allis-Chalmers Manufacturing Company,

Milwaukee, Wis., a corporation of Delaware `Continuation of application Serial No. 527,047, March 18, 1944. This application July 9, 1948,

Serial No. 37,798

This invention relates generally to control means for fluid pressure operated motors and particularly to interlocking means for controlling the operation of one motor while another motor is operating.

It is an object of the present invention to provide a new and improved motive system including a plurality of iiuid pressure operated motors in which movement of one motor is arrested in response to movement of another motor.

Another object of the invention is to provide a new and improved motive system including a plurality of fluid pressure operated motors in which one motor is gradually decelerated in response to movement of another motor.

Another object of the invention is to provide a new and improved motive system` including a plurality of iluid pressure operated motors in which one motor is prevented from operating while another motor is operating.

Another object of the invention is to provide a new and improved motive system including a plurality of fluid pressure operated motors in which the deceleration of one motor is dependent upon the deceleration of another motor.

Objects and advantages other than those above set forth will be apparent from the following description when read in connection with the accompanying drawing, in which the single figure is a diagrammatic showing of a circuit breaker and control therefor embodying the present invention.

As shown in the drawing, the circuit breaker consists essentially of a iixed arcing contact 6 and a movable contact 1 connected in series with disconnect contacts 8 and S in a circuit indicated by conductors II and III. The movable arcing contact 1 is actuated to open position by the breaking of a toggle formed by links 9|, one end of which is anchored to the circuit breaker frame by a spider member 99. The toggle SI is broken by movement of piston 92 to the right as viewed in the drawing. The piston 92 is biased by spring 93 to hold the aroing contacts 9, 1 in the closed position shown. The toggle 9| is electrically paralleled by shunt 13.

When the arcing contacts 1 are separated, the arc drawn therebetween is blasted through the orifice 28 against auxiliary contact S5, thereby connecting the resistance SE in circuit with the arc. The effect of the resistance 96 and the deionization and lcooling provided by the blast of air through the orice 28, quickly extinguishes the arc and interrupts the circuit through conductors II and III. After the are is extinguished 7 Claims. (Cl. 121-38) at the arcing contacts 6, 1, the disconnect contacts 8, 9 are opened thereby isolating conductors II and II I. Opening of the disconnect contact 9 effects closure of the blast valve I4, thereby permitting the spring S3 to reclose the arcing contacts 6, 1. The circuit is closed by closing the disconnect contacts 8, 9.

Separate fluid operated motors I2 and i3 are provided for closing and opening actuation, respectively, and these motors are interlocked with each other and with the blast valve operation to provide for rapid operation, especially when the breaker is closed and immediately reopened or opened and immediately reclosed. In high voltage circuit breakers of the type used for outdoor installations, the disconnect contact 9 and its operating members are necessarily large and heavy and therefore have great inertia. These members are not only rapidly operated, but also provision is made for absorbing their kinetic energy and for preparing for an immediate reverse operation.

The circuit breaker is shown with all parts thereof and of the pneumatic control system in l the open circuit position. A closing operation is initiated by energization of the closing solenoid valve 34, thereby permitting air under pressure from tank I1 and feed pipe 21 to be fed to pipe 11. Air under pressure in pipe 11 acts through pipe 1I on the slide valve 68 of the opening motors I3. A slot 12 in the operating linkv of slide valve 68 permits the slide valve 58 to be moved to the left, thereby opening port S9 in cylinder 62 to atmosphere through port 1E. This permits bleeding to atmosphere of any air under pressure in cylinder 62 of opening motor il* tending to provide an opening impulse.

Pressure air in pipe 11 also opens chock valve 18 against the bias of its .spring Si? and feeds air under pressure to the cylinder 16 through the passage 19. Opening of check valve 13 closes the port 8l)y and the passage through the needle valve 8I, so that the air pressurein cylinder 16 available for movement of piston 15. This air pressure moves piston 15 to the left, rotating shaft Il) to close the movable disconnect contact 9. The impact of stopping the closing movement of contact 9 is cushioned by action of opening piston 6I in opening cylinder 62. As closing movement of the contact 9` takes place, a pin on the operating link 63 moves in the slot 12 of the slide valve 68 and further movement of shaft I0 and link 63 moves the slide valve 68 to vthe right as'viewed in the drawing, thereby closing port 10. Further movement of the piston 6! is utilized to cushion the impact of stopping the closing mechanism by compressing the remaining air in cylinder 52 to a degree adjusted by the amount of air bled through the passage 65 past the needle valve G1.

Closing movement of the shaft I also moves link 33 to reset the operating mechanism of the blast valve I4 for an opening operation. Closing movement of the shaft I0 moves slide valve 22 to the right as viewed in the drawing, closing the

ports

24 and 30. This closes the space above pistons I8 and 2G of the main and pilot valves I4 and I5 in readiness for an opening operation. Movement of link 33 also moves slide valve 25 to the left as viewed in the drawing closing the air passage 32 and opening the space underneath piston I8 to atmosphere through passage 25 and port 3|. The valve operating mechanism is now ready for an opening operation. Slide valve 82 is moved by a pin on the operating link 63 acting in the slot 14 to

open ports

83 and 84. This bleeds out air behind the closing piston 15 and prepares closing motor I2 for proper functioning during an opening operation. The breaker is now closed.

To open the breaker, solenoid Valve 35 is energized placing pressure air from pipe 21 on top of piston 2D of the pilot valve I5. Opening of the pilot valve I5 places pressure air from pipe 21 on top of piston |8 of the main blast valve I4. The pipe 21, the opening controlled by valve I5 and the passageway from this valve to the piston I8 all have relatively large cross sectional areas so that opening of the blast valve takes place immediately upon opening of the pilot valve I5. Opening of the blast valve |4 places pressure air in the manifold I6 and also in the chamber containing the arcing contacts B, 1.

While the pressure is being built up in the contact chamber, substantially full contact pressure is maintained on the arcing contacts until separation actually begins, due to the action of spring 93 and toggle links 9|. Pressure from the contact chamber acts through valve 94 upon piston 92 to break the toggle 9|, thereby separating the arcing contacts. The needle valve 94 is adjusted to assure opening of the arcing contacts only after there is a predetermined air pressure in the contact chamber. The arc formed at the separating arcing contacts 6, 1 is then extinguished by the blast of `air in the manner previously described.

The disconnect contact 9 is opened a predetermined time after opening of the arcing contacts. Air from the blast tube I6 flows through the feed pipes 54 and 88 and acts on piston 81, raising the same until the projection 89 is stopped against the check valve 'I8 holding the same closed. In this position of piston 81, the pipe 86 is opened to atmosphere. The diameter of piston 81 is greater than that of valve 18. Thus, the action of piston 81 not only prevents closing air from opening the check valve 18 and being'applied to the piston 15, but also bleeds 01T any closing air pressure retained in the pipe 11 which might be available to initiate a closing operation even though the valve 34 is not opened. This interlock is especially advantageous on a close-open operation, where opening takes place immediately after closure.

Air under pressure in feed pipe 64vis also fed through pipe 85 to the slide valve 82. This action maintains the

ports

83 and 84 open until the pin on member 63 has moved to the end of the slot 14. The closing motor is thereby prevented from arresting the action of the opening motor during the rst part of its opening stroke. Pressure air from the blast tube I6 is also fed through pipe 64 to check valve 65 of opening motor I3. Movement of check valve 65 closes the port 66 and permits pressure air to build up in cylinder 62, thereby moving piston 6| to the left and opening disconnect contact 9.

In order to conserve blast air and to rapidly prepare the operating system for immediate reclosing of the disconnect contacts, opening movement of the shaft I0 acting through link 33 moves the slide valve 22 to the left as viewed in the drawing, first opening port 3D to permit pressure air from above piston 2|! to discharge to atmosphere through the port 23. This permits pilot valve I5 to be immediately closed by action of its biasing spring 2|. Further movement of slide valve 22 to the left opens port 24 permitting air above the piston I8 of the main blast valve to be exhausted to atmosphere through port 23. To aid in rapidly reclosing the blast valve I4, opening movement of the shaft IU and link 33 moves slide valve 26 to the right closing the port 3| and opening the port 32 so that pressure air is applied through passageway 25 to the underside of the piston I8. This aids the spring I9 to rapidly close the blast valve I4, thereby conserving the air pressure in tank |1 and resetting the blast valve operating mechanism for an opening operation.

During the opening movement of the shaft I0, slide valve 82 is moved to the right when the pin on link 63 moves to the end of slot 14 and slide valve 82 therefore provides for the cushioning action of piston 15 in the same manner as described with regard to the action of piston 6| and the slide valve 68 during the closing operation. The cushioning action of piston 15 is regulated by the needle valve 8|.

Only one pole of the circuit breaker has been referred to in describing the operation, however the blast tube I6 and the operating link 98 on shaft I0 may extend to the other poles of the breaker and operate the contacts thereof at the same time.

Solenoid valves

34 and 35 are placed close to the main stop valve 29 so that operation or partial operation cannot occur when valve 29 is shut because of air stored in the pipes between

valves

34 or 35 and valve 29.

Although but one embodiment of the present invention has been illustrated and described, it will be apparent to those skilled in the art that various changes and modications may be made therein Without departing from the spirit of the invention or from the scope of the appended claims.

This application is a continuation of an application of Gustav E. Jansson, Serial No. 527,047, filed March 18, 1944, now abandoned.

It is claimed and desired to secure by Letters Patent:

1. In combination, a member adapted to be moved in two directions, a fluid pressure operated motor connected ywith said member for moving said member in one direction, a fluid pressure operated motor connected with said member for moving said member in the other direction, iluid pressure means for supplying uid under pressure to said motors, valve means including a cylinder and a valve body movable in a predetermined direction in said cylinder for initiating the supply of fluid under pressure to one of said motors and for controlling the now of fluid from said one of said motors to arrest movement of said member, and interlocking means including a, piston actuated by fluid under pressure supplied to the other of said motors, said piston being movable in said cylinder toward said valve body to engage said valve body to prevent movement thereof in said predetermined direction.

2. In combination, a member adapted to be moved in two directions, 9, fluid pressure operated motor connected with said member for moving said member in one direction, a fluid pressure operated motor connected with said member for moving said member in the other direction, fluid pressure means for supplying fluid under pressure to said motors, a cylinder having an opening therein, valve means including a check valve for initiating the supply of fluid under pressure through said opening to one of said motors, said check valve being slidable within said cylinder in a predetermined direction to uncover said opening, and interlocking means including a piston slidable within said cylinder and biased away from said check valve and actuated by fluid under pressure supplied to the other of said motors, said piston being movable toward said check Valve from a nonengaging position therewith to an engaging position therewith to prevent opening movement thereof in said predetermined direction.

3. In combination, a member adapted to be moved in two directions, a fluid pressure operated motor connected with said member for moving said member in one direction, a fluid pressure operated motor connected with said member for moving said member in the other direction, fluid pressure means for supplying fluid under pressure to said motors, valve means including a cylinder and a valve body for initiating the supply of fluid under pressure to one of said motors, said valve body being movable in said cylinder in a predetermined direction to open said valve means, and interlocking means actuated by fluid under pressure supplied tc the other of said motors, said interlocking means being movable in said cylinder toward said valve body from a nonengaging position therewith to an engaging position therewith to prevent opening movement thereof in said predetermined direction.

4. In combination, a member adapted to be moved in two directions, a fluid pressure operated motor connected with said member for `moving said member in one direction, a fluid pressure operated motor connected with said memberfor moving said member in the other direction, fluid pressure `means for supplying fluid under pressure to said motors, a cylinder having openings therein, valve means including a check valve for initiating the supply of fluid under pressure through one of said openings to one of said motors and for controlling the flow of fluid from said one of said motors through another of said openings to arrest relative movement of said member, said check valve being slidable within said cylinder in a predetermined direction to uncover said one of said openings, interlocking means including a piston actuated by fluid under pressure supplied to the other of said motors and biased away from said check valve, said piston being slidable in said cylinder and movable toward said check valve to engage said check valve to prevent movement thereof in said predetermined direction.

5. In combination: an oscillatory operating link; a fluid pressure operated motor connected Iwith said link for moving said link in one direction, said motor being operable from an initial position to a final position; a, fluid pressure operated motor connected with said link for moving said link in the other direction; fluid pressure means for supplying fluid under pressure to said motors, valve means movable in one direction in response to fluid pressure for releasing fluid pressure from one of said motors; and lost motion means connecting said link with said valve means whereby said valve means is movable independently of said link in response to the supply of fluid under pressure to the other of said motors to move said one of said motors from said final position toward said initial position.

6. In combination: an oscillatory operating link; a fluid pressure operated motor connected with said link for moving said link in one direction, said motor being operable from an initial position to a final position; a fluid pressure operated motor connected with said link for moving said link in the other direction; fluid pressure means for supplying fluid under pressure to said motors, valve means movable in one direction in response to fluid pressure for releasing fluid pressure from one of said motors; lost motion means connecting said link with said valve means whereby said valve means is movable independently of said link in response to the supply of fluid under pressure to the other of said motors to move said one of said motors from said final position toward said initial position; and decelerating means associated with said one of said motors including said valve means to retard the movement of said other of said motors near said final position.

7. In combination, a member adapted to be moved in two directions, a first fluid pressure operated motor connected with said member for moving said member in one direction, a second fluid pressure operated motor connected Iwith said member for moving said member in the other direction, a supply of fluid under pressure for said motors, means for utilizing said first motor for arresting movement of said second motor, said means comprising valve means for venting said first motor to atmosphere, first means actuated by said second motor for actuating said valve means, second means actuated by fluid under pressure for actuating the said valve means, and means acting independently of the movement of said member for simultaneously supplying fluid under pressure to said second motor and to said second valve actuating means to cause said valve means to operate independently of the movement of said member.

GUSTAV E. JANSSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 917,642 McElroy Apr. 6, 1909 1,283,179 Hennebohle Oct. 29, 1918 1,604,548 Dapron l Oct. 26, 1926 2,223,792 Muir 1 Dec. 3, 1940