US3294022A

US3294022A - Post-actuating pumps for motor cars

Info

Publication number: US3294022A
Application number: US418503A
Authority: US
Inventors: Hunger Walter
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-12-15
Filing date: 1964-12-15
Publication date: 1966-12-27
Anticipated expiration: 1983-12-27

Description

Dec. 27, 1966 w. HUNGER 3,294,022

POST-ACTUATING PUMPS FOR MOTOR CARS Filed Dec. 15, 1964 5 Sheets-Sheet 1 INVENTOR. W. H u my e 1 ATTORNE Y5 Dec. 27, 1966 W. HUNGER 3,294,022

POST-ACTUATING PUMPS FOR MOTOR CARS Filed Dec. 15, 1964 5 Sheets-Sheet 2 INVENTOR.

M. Hu nger' GLJLWQ Q QLM ATTORNEYS Dec. 27, 1966 w. HUNGER 3,294,022

POST-ACTUATING PUMPS FOR MOTOR CARS Filed Dec. 15, 1964 {5 SheetS Sheet 3 INVENTOR WALTER HUNGER United States Patent Ofiice 3,294,022 PUST-ACTUATING PUMPS FOR MOTOR CARS Walter Hunger, Rodenbacherstrasse 50,

Lohr (Main), Germany Filed Dec. 15, 1964, $931. No. 418,503 6 Claims. (Cl. ltl3lll) This invention relates to pumps for the supporting devices of motor cars and refers more particularly to manually and electrically operable hydraulic pumps for operating supports or posts of semi-trailers which connect them to motor cars.

Hydraulically driven supports or posts are now operated by hand or by motor pumps. A drawback of prior art constructions which is particularly noticeable in saddle type car frames and trailers, is that there is a great deal of waste of time in manipulating the forward movement of the posts, particularly since the required gear ratio for the maximum load is preset. Motor pumps used for operating the posts are generally of the reciprocating type and they can be operated from one side only.

Posts are usually arranged in pairs and they are now moved uniformly outwardly by two-cycle pumps, so that unevenness of the ground or different ground inclinations can not be taken into account; one-cycle pumps are also used which make possible the adjustment of the posts to the shape of the ground, but which jack up the posts unevenly with an uneven or one-sided load.

Heretof-ore, it was necessary to adjust the pressure medium by several hand-operated valves; this increased to a substantial extent the length of time require for the operation. Furthermore, there was a danger of accidents resulting from the fact that the operator could mix up the valves or that they would be improperly operated by an unqualified person.

An object of the present invention is the provision of means operable during the outward movement of the car posts (when they move without load) to balance the pressure of the system so that ground inclinations or substantial ground unevennesses can be compensated; after the compensation has taken place the same means operate the posts when they raise the load (moving under load) to cause the posts to move by equal distances even if the load is uneven.

Another object is to diminish the time required for operating car supports or posts and to eliminate the danger of confusion during operation by providing a single actuating member for carrying out the operations described in the first-mentioned object of the invention.

A further object is to provide means making possible the operation of the car posts by the use of cranks, at will from both sides of the car and in any rotary direction of the pump axle, and to provide manual as well as electric operational facilities.

Yet another object is to operate the entire supporting device electrically from the available car battery and without the use of any additional power sources.

A still further object is the provision of a car supporting device having an adjustable actuating slide which is operable when a predetermined power has been exceeded to switch the pump automatically to high pressure.

Other objects of the present invention will become apparent in the course of the following specification.

In accomplishing the objects of the present invention, it was found desirable, according to one of the embodiments thereof, to provide a pump having several pistons and operating with a high pressure side and a low pressure side, whereby the low pressure side transmits a multiple 3,Z%,ZZ Patented Dec. 2?, 1966 of the volume transmitted by the high pressure side. One channel of the low pressure side connects all the low pressure pistons, while a high pressure channel connects an equal number of high pressure pistons for each post. Preferably, the pump body has one low pressure channel and an even number of high pressure channels.

During operation in the low pressure range, the high pressure side is connected with the low pressure side by an adjustable actuating slide, so that pressure upon the posts is equalized. Therefore, the posts can move outwardly by varying lengths, until they engage the ground with equal pressure. When a set low pressure range is exceeded the actuating slide is so shifted by built up pressure of the pressure medium, that the high pressure side is separated from the low pressure side and that the low pressure side is connected with the inlet channel. Then, within the high pressure range, the posts are further moved by equal path lengths, and thus a horizontal raising of the load is always assured, even if the ground is uneven and if the load upon the individual posts is not uniform.

A tumbler disc or cam disc provided for actuating the pump pistons, is mounted upon the driving shaft. "Means, such as threaded grooves may be provided for shifting the tumbler disc axially upon the shaft. The arrangement may be such that the driving shaft is shifted axially in one direction when rotated counterclockwise by by means of a hand-operated crank. One or more springengaged ball valves cooperate with a valve body or sleeve and are rotatably mounted and axially movable upon said driving shaft, whereby the valves are raised from their seats during an axial movement of the sleeve. In this open position of the valves the return movement can taken place. The valve springs are released and the posts move back without further actuation.

The basic inventive feature of the present invention can be also carried out into practice by other suitable means, for example, by drivers, and then it is not necessary to provide for an axial movement of the driving shaft.

When the source of power is inoperative the apparatus can be operated manually.

The invention will appear more clearly from the following detailed description when taken in connection with the accompanying drawings showing, by way of example, preferred embodiments of the inventive idea.

In the drawings:

FIGURE 1 shows in section a two-stage, double circuit piston pump constructed in accordance with the principles of the present invention.

FIGURE 2 is a section through a piston pump of a somewhat different construction.

FIGURE 3 is a side view of a semi-trailer provided with posts operated by the pump of the present invent-ion.

FIGURE 4 is a section along the line IV-IV of FIG. 3.

Throughout the drawings similar parts are designated by the same numerals.

FIG. 3 shows a motor car 21 pulling a semi-trailer 22. The main frame of the semi-trailer carries supports or posts 23. These posts are moved outwardly by turning a hand crank 26 (FIG. 4) of a pump constituting the subject of the present invention and provided with a casing 1. After the crank has been turned one half of a revolution in the opposite direction the posts 23 are moved inward-1y by inner springs, as will be described hereinafter.

Furthermore, the pump can be actuated additionally by an electromotor 25 connected with a gear drive 24. The current of the motor 25 is supplied by the battery of the motor car.

The apparatus shown in FIG. 1 includes the casing 1 which serves at the same time as a storage tank and wherein the pump body 2 is located. A driving shaft 3 extends through the pump body 2 and carries a tumbler disc 4. An actuating sleeve 5 has a threaded portion 6 which is engaged by a guiding pin 7. The sleeve 5 is mounted upon the shaft 3 and is shifted axially thereon by the engagement of the pin 7 when the rotation of the shaft is reversed. The sleeve 5 is also engaged by pins 8 which constitute parts of ball valves 8a. The sleeve 5 has conical surfaces adapted to engage the pins 8 and move them into engagement with the balls of the ball valves 8a, thereby opening the valves. As the shaft is further rotated the pins 8 will be lowered again. Coiled springs 9 and 9b enclose portions of the shaft 3 and are located on opposite sides of the sleeve 5; they facilitate the engagement of the pin 7 with the screw threads of the sleeve portion 6. A spring 9 is under tension only in an end position of the sleeve 5.

The coiled spring 9b has the tendency to push the sleeve 5 against the weaker spring 9. When shaft 3 is turned in the operating direction, the threaded sleeve portion 6 engages the pin 7 and slides with the thread inlet past the pin. When the shaft 3 is turned in the opposite direction the thread inlet is pressed over the pin 7, so that when the shaft is further rotated the threaded sleeve portion can move along the pin 7, so that the sleeve 5 is moved. These movements of the sleeve 5 actuate the pins 8 of the ball valves 81;.

This arrangement makes it possible to open the out flow valves of the high pressure channels by turning the driving shaft in the direction opposite to that of its normal direction of rotation during operation.

Composite pistons consisting of low pressure pistons 10 and high pressure pistons 11 are located within the pump body 2 and are actuated by the tumbler disc 4 against the action of springs 12 engaging inner ends of the pistons.

Suction valves

13 and 14 which are engaged by the springs 12, are in communication with the suction channel 15, so that oil is introduced from the storage tank constituted by the casing 1 into the channel 15 and the

valves

13 and 14. The pump body 2 also carries check valves 16 and 17; oil is pressed through the valves 16 into the channel N constituting the low pressure channel; oil is pressed through the valves 17 into the channels H and H const-ituting high pressure channels. The high pressure channels H and H are directly connected by conduits 19c and 19d with the passages 5 and S containing the movable posts (not shown) of the motor car. The posts are actuated directly by the pressure medium located in the passages S and S A casing 18 contains the actuating slide 19 which may be shifted through an adjustable pressure spring 20 into the low pressure position.

In operation, oil flows from the low pressure channelN through the conduit 19a into the interior 19b of the slide 19 and hence through the conduits 19c and 19d into the high pressure channels H and H and also to the passages S and S Thus the inner chamber 1% of the slide 19 provides for a compensation of pressure when the posts are pushed outwardly within the no load range, so that the posts may be moved to an unequal extent.

After the posts have reached the ground oil pressure will increase in the passages S and S through which the posts are actuated and this oil pressure will be transmitted through a branch 19e of the conduit 19c into a chamber 19 located within the casing 18 opposite the spring 20. This oil pressure will overcome eventually the adjustable pressure of the spring 20 and then the slide 19 will be moved to the left (looking in the direction of FIG. 1) until the high pressure conduits 19c and 19d leading to the high pressure channels H and H are closed, so that the oil flowing from the low pressure channel N will be guided back into the suction channel 15. Now only the high pressure channels H and H provide pressure medium operating upon the posts. It is apparent that one channel of the low pressure side connects all the low pressure pistons, while the high pressure channel connects an equal number of high pressure pistons for each post. The pump body has one low pressure channel and an even number of high pressure channels. Thus in the high pressure range an equal number of high pressure pistons is operable, with each piston operating through its own channel upon a separate post. This provides equal volume of the pressure medium for the further actuation of the posts, so that the posts will now move under load by equal lengths.

To retract the posts, pressure upon them is released by operating the valves 8a in the manner hereinabove described. Then the slide 19 is moved by the spring 20 back into its low pressure position and the posts can move back into their initial positions while pressures are balanced.

A somewhat different construction is shown in FIG- URE 2 of the drawing. In this construction a tumbler disc 4 is held by means of a pin 5' in a groove 6 provided in the driving shaft 3'. The groove 6' extends helically on both sides to so that the pin 5' can always engage the end of the groove and the shaft 3' IVVhI1 rotated, will be always shifted to the right (looking in the direction of FIG. 2).

The driving shaft 3' carries a conical sleeve or valve body 7' which can rotate and be moved axially upon the shaft 3. The valve body 7 seals the space 21 located to the left thereof from the space serving as the storage tank.

In this construction, to withdraw the posts, the driving shaft 3' is turned back to the extent of 90; it will be moved thus to the left due to the engagement of the pin 5' with the groove 6. Then the ring 9 keyed upon the shaft 3 will push the valve body 7 to the left, thereby actuating the pins 22 and raising the ball valves 23, so that the space 21 as well as the passages S and S will be connected with the storage tanks.

In other respects, namely, as far as the pump body 2, the low pressure pistons 10, the high pressure pistons 11 and the slide 19 are concerned, the construction is the same and the posts are moved forward in the same manner as that described in connection :with FIG. 1.

It is apparent that the examples described above have been given solely by way of illustration and not by way of limitation and that they are subject to many variations and modifications within the scope of the present invention. All such variations and modifications are to be included within the scope of the present invention.

What is claimed is:

1. In a hydraulic pump for operating motor car posts by a pressure medium, a pump body comprising a single low pressure channel, an even number of high pressure channels and post-actuating passages; a driving shaft extending through said pump body, compound high pressure and low pressure pistons in said pump body, said pump body having inner passages connecting each of said pistons with a separate channel, a tumbler disc carried by said driving shaft and actuating said pistons, a sleeve carried by said shaft and located within an inner chamber of said pump body, valves located between said postactuating passages and said inner chamber, said sleeve being adapted to open and close said valves, means connected with said shaft for actuating said sleeve, a casing, conduits connecting said channels with the interior of said casing, said passages communicating with the conduits connected to the high pressure channels, a slide movable within said casing and having recesses adapted to establish communication between said conduits, and means adjusting the position of said slide \within said casing, said slide being adapted to be actuated by the pressure medium to separate the conduit connected to the low pressure channel from the conduits connected to the high pressure channels, wherein the sleeve-actuating means '5 comprise a pin carried by said pump body and engaging screw threads formed in a portion of the sleeve.

2. A pump in accordance with claim 1, wherein the sleeve-actuating means comprise a pin carried by said tumbler disc and engaging screw threads formed in a portion of the shaft.

3. A pump in accordance with claim 1, comprising a driver actuating said valves.

4. A pump in accordance with claim 1, wherein the pump can be actuated from both sides of a motor car and wherein the rotation of the shaft in any direction will release the posts.

5. A pump in accordance with claim 1, wherein the pump is actuated electrically by the motor of the motor car to move the posts outwardly.

6. A pump in accordance with claim 5, wherein the return movement of the posts is possible only by manual actuation of the shaft.

References Cited by the Examiner UNITED STATES PATENTS Rasle 60-52 Davis 103-173 Jakobsen 103-173 Westbury et al 103-5 Towler et al 103-173 Smith 103-5 McFarland et a1 103-168 Leissner 103-173 Wood 103-10 Gandels 103-10 15 MARK NEWMAN, Primary Examiner.

SAMUEL LEVI-NE, MARTIN P. SCHWADRON,

Examiners.

W. L. FREEH, Assistant Examiner.

Claims

1. IN A HYDRAULIC PUMP FOR OPERATING MOTOR CAR POSTS BY A PRESSURE MEDIUM, A PUMP BODY COMPRISING A SINGLE LOWER PRESSURE CHANNEL, AN EVEN NUMBER OF HIGH PRESSURE CHANNELS AND POST-ACTUATING PASSAGES; A DRIVING SHAFT EXTENDING THROUGH SAID PUMP BODY, COMPOUND HIGH PRESSURE AND LOW PRESSURE PISTONS IN SAID PUMP BODY, SAID PUMP BODY HAVING INNER PASSAGES CONNECTING EACH OF SAID PISTONS WITH A SEPARATE CHANNEL, A TUMBLER DISC CARRIED BY SAID DRIVING SHAFT AND ACTUATING SAID PISTONS, A SLEEVE CARRIED BY SAID SHAFT AND LOCATED WITHIN AN INNER CHAMBER OF SAID PUMP BODY, VALVES LOCATED BETWEEN SAID POSTACTUATING PASSAGES AND SAID INNER CHAMBER, SAID SLEEVE BEING ADAPTED TO OPEN AND CLOSE SAID VALVES, MEANS CONNECTED WITH SAID SHAFT FOR ACTUATING SAID SLEEVE, A CASING, CONDUITS CONNECTING SAID CHANNELS WITH THE INTERIOR OF SAID CASING, SAID PASSAGES COMMUNICATING WITH THE CONDUITS CONNECTED TO THE HIGH PRESSURE CHANNELS, A SLIDE MOVABLE WITHIN SAID CASING AND HAVING RECESSES ADAPTED TO ESTABLISHED COMMUNICATION BETWEEN SAID CONDUITS, AND MEANS ADJUSTING THE POSITION OF SAID SLIDE WITHIN SAID CASING, SAID SLIDE BEING ADAPTED TO BE ACTUATED BY THE PRESSURE MEDIUM TO SEPARATE THE CONDUIT CONNECTED TO THE LOW PRESSURE CHANNEL FROM THE CONDIUTS CONNECTED TO THE HIGH PRESSURE CHANNELS, WHEREIN THE SLEEVE-ACTUATING MEANS COMPRISE A PIN CARRIED BY SAID PUMP BODY AND ENGAGING SCREW THREADS FORMED IN A PORTION OF THE SLEEVE.