GB2095429A - Device having a controllable output shaft - Google Patents
Device having a controllable output shaft Download PDFInfo
- Publication number
- GB2095429A GB2095429A GB8203569A GB8203569A GB2095429A GB 2095429 A GB2095429 A GB 2095429A GB 8203569 A GB8203569 A GB 8203569A GB 8203569 A GB8203569 A GB 8203569A GB 2095429 A GB2095429 A GB 2095429A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- piston rod
- control member
- rod
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
- F15B9/10—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor in which the controlling element and the servomotor each controls a separate member, these members influencing different fluid passages or the same passage
Abstract
A double acting working cylinder having a directional valve (14-17, 19-21, 35-37) arranged in the piston rod (12) and operable by means of a push rod (18) guided in the piston rod (12) to set the position of the piston rod relative to the cylinder housing (1). An adjusting arrangement, mounted on the cylinder housing (1) sets the position of the push rod (18) by way of a switching lever (27). The piston rod (12) extends outside the housing (1). The switching lever (27) is held pivotably in the piston rod (12), bears against the push rod (18) and is operated by a bowden cable 31. <IMAGE>
Description
SPECIFICATION
Device having a controllable output shaft
The invention relates to a device having an output shaft the position of which is controllable.
Devices with controllable shafts are used to perform certain functions in engines, appliances and control devices in industrial plants, where it is desired to achieve set positions without the use of fixed stops.
A device with a controllable shaft is described in
DE-PS 27 07419, in which a working cylinder is divided into two chambers by a working piston provided with a piston rod. A multi-way valve connects the cylinder to a source of compressed air.
The multi-way valve has a switch rod rigidly con necked to a clamping arrangement which surrounds the piston rod and is operable by compressed air.
When the output shaft is to be moved, the clamping arrangement is held open by compressed air and the piston rod slides in the clamping arrangement.
When the piston rod reaches the desired position, the supply of compressed air to the clamping arrangement is shut off, so that the clamping arrangement closes under the force of a spring. As a result of the piston rod being held by the clamping arrangement, the switch rod connecting the multiway valve to the clamping arrangement will follow any piston rod movement and the multiway valve will act to keep the piston rod at the clamped position.
This known device has the disadvantage that it is relatively complicated in construction. A 5/2-way valve is required in order to admit air to, and release it from, the two chambers of the working cylinder. In addition, a separate control device is needed for the clamping arrangement. Furthermore, in the event of the piston rod becoming fouled with oil, the piston rod may slip in the clamping arrangement, so that arrestmentofthe piston in a predetermined position cannot always be guaranteed.
It is an object of the present invention to provide a device having an output shaft the position of which is controllable and which is less complicated than the known device.
According to the present invention, a device, having an output shaft the position of which is controllable, includes,
(i) a piston - and - rod assembly housed and movable in a working cylinder which has a fluid inlet port communicating with one side of the piston, the piston - and - rod assembly including the output shaft
(ii) a control member arranged to control the position of the piston - and - rod assembly, the control member and the piston - and - rod assembly together forming directional control valve means which so controls fluid pressure around the piston that the piston - and - rod assembly takes up a fixed position relative to the control member when working fluid is present at the inlet port, and
(iii) adjusting means for setting the position of the control member in the working cylinder.
A device having an output shaft the position of which is controllable, includes,
(a) (i) a working cylinder divided by a working piston, which has a piston rod, into a first pressure medium chamber adjacent the piston rod and a second pressure medium chamber arranged on the other side of the working piston with respect to the first pressure medium chamber, the piston rod providing the output shaft,
(ii) the piston rod having a bore extending in the axial direction;
(iii) the working piston having a bore extending in the axial direction;
(iv) part of the bore arranged in the piston rod being constructed as a valve chamber in which valve means is arranged, by means of which valve means air can be released from a pressure medium chamber;;
(b) means for actuating the valve
(c) at least one pressure medium connection in the working cylinder by means of which air can be admitted to the pressure medium chambers;
(d) a pressing or pulling control member, which is guided through at least a portion of the bore in the piston rod is provided for actuating the valve means;
(e) an opening in the piston rod serves to receive an element for actuating the pressing or pulling control member which actuating element is in operational connection with the pressing or pulling control member, and
(f) an adjusting arrangement is connected to the element for actuating the pressing or pulling control member.The control member may be constructed as a push rod which is rigidly connected, at one end, to a valve closure member and, at the other end, to a guide member, the guide member being acted upon by a compression spring which is supported in such a manner that the push rod, with the valve closure member is urged towards an end position, the valve means may be constructed as a sliding valve formed from a valve closure member constructed as a slider, two bores which penetrate the piston rod in a radial direction and three sealing elements, the valve closure member having a through-bore extending in the radial direction and, connected therewith, a bore extending in the axial direction. The adjusting arrangement may be on the housing of the working cylinder. The actuating element may be constructed as a lever.The lever which is in operational connection with the pulling or pressing control member may be at one end mounted in a dish-like recess in the wall of the piston rod and, at the other end, which projects out of the opening provided in the piston rod, connected by a Bowden wire to the adjusting arrangement. The effective surface of the working piston which is remote from the piston rod may be larger than the effective surface of the working piston facing the piston rod.
The device provided by the invention is simple in construction and essential components that effect the switching are integrated into the working cylinder.
The invention is described in detail below with reference to an embodiment shown in the drawings.
The drawings show a double-action working cylinder having a directional valve arranged in the piston rod and operable by means of a push rod guided in the piston rod, a switching lever and, connected to the switching lever, an adjusting arrangement mounted on the housing of the working cylinder.
In a housing 1 of a double-action working cylinder, a working piston 3 provided with a seal 2 is arranged to move in the axial direction. The working piston divides the working cylinder into two pressure medium chambers 4 and 5. One end of the working cylinder is closed by a cap 7 provided with a seal 6. In the region of the other end of the working cylinder, steps are provided on the inside of the housing 1 on which are mounted a guide bush 8 and, arranged in series therewith, two annular seals 9 and 10, the seal 10, which closes off this end of the working cylinder, having a bead 11 extending around its circumference, which bead engages a corresponding recess in the wall of the housing 1.
The working piston 3 is connected to a piston rod 12 which is guided through the guide bush 8 and the two seals 9, 10 and projects slightly out of the working cylinder. The piston rod 12 has a bore 13 extending in the axial direction which is enlarged in the region of the working piston 3, this enlarged portion of the bore 13 forming with a portion of the working piston 3 a valve chamber 14. In the valve chamber 14 are arranged three annular sealing elements 15,16, 17 which are separated from one another by spacing elements.
A push rod 18 guided in the bore 13 of the piston rod 12 is constructed at the end nearest the working piston 3 as a slider-like valve closure member 37, 19.
The push rod 18 thus serves to actuate the valves 15, 37 and 16,37. Arranged in the end valve closure member 19 is an axial bore 20 one end of which is connected to a bore 21 that penetrates the bottom of the working piston 3 and the other end of which is connected to a bore 22 that penetrates the valve closure member 37 nearest the push rod in a radial direction.
Two bores 35 and 36 that penetrate the piston rod 12 in a radial direction connect the chamber5 of the working cylinder with the valve chamber 14. The other end of the push rod 18 has a gudgeon 23 which is provided with a screw thread onto which a guide member 24 is screwed. The guide member 24 is acted upon buy a compression spring 25 which is supported on a shoulder of the bore that penetrates the piston rod 12.
A process 26 provided in the piston rod 12 and serving as an opening receives a lever 27. The lever 27 serves as an element for actuating the push rod 18. One end of the lever 27 is roughly hemispherical in shape and, together with a further recess 28 provided in the piston rod 12 opposite the recess 26, forms a ball-jointed connection. In the region of the piston rod bore 13, the lever 27 has a constricted portion 29 against which the guide member 24 of the push rod 18 rests. The free end of the lever 27, projecting out of the recess 26, has a bore 30 for receiving and securing a Bowden wire 31.
On the housing 1 of the working cylinder there is arranged a stop 32 which serves to secure the
Bowden wire 31 and to guide an actuating element 33 provided as an adjusting arrangement. The working cylinder can be connected to a source of compressed air via a connection 34.
The operation of this device is described in detail below.
If the working cylinder is to be set in operation, the connection 34 is connected to a source of compressed air (not shown). For the duration of operation therefore, pressure medium is always present in the chamber 5 of the working cylinder. The push rod 18 and also the valve closure member 37, 19 are held in their left end position by means of the compression spring 25, so that the valve comprising the valve chamber 14, the valve closure member 37, the two bores 35,36 and the sealing element 16 is open.
Pressure medium flows through the bores 35,36 from the chamber 5 into the valve chamber 14 and from there through the bores 22, 20 of the valve closure member 37 and through the bore 21 in the working piston 3 into the chamber 4 of the working cylinder.
The pressure thus buidmling up in the chamber 4 moves the working piston 3 in a direction towards the chamber 5 by virtue of the larger effective surface of the working piston 3 as compared with the effective surface facing the piston rod. If the lever 27 which is in operational connection with the push rod 18 is pulled by the Bowden wire 31 into its middle position against the force of the compression spring 25, then the push rod 18 is moved to the right. The valve 37,16 closes, so that the supply of compressed air to the chamber 4 of the working cylinder is interrupted. The working piston 3 remains in this position.
If the lever 27 is brought into the right end position by the Bowden wire 31, the pugh rod 18 and therewith also the valve closure member 37 is moved further to the right. The pressure medium escapes from the chamber 4 through the bore 21 arranged in the working piston 3 and through the bores 20, 22 provided in the valve closure member 37 into the valve chamber 14 and from there through the valve 15,37,which is then open, into the piston rod bore 13. Since the push rod 18 and the guide member 14 are so dimensioned that there is a gap between them and the piston rod bore 13, which gap can also be replaced inter alia by a groove extending in the longitudinal direction of the push rod 18 and the guide member 24, the pressure medium escaping from the chamber 4 into the valve chamber 14 enters the atmosphere via the recess 26 provided for the lever 27.
As a result of air being released from the chamber 4 and admitted to the chamber 5 which is continuously connected to the source of compressed air, the working piston 3 again reaches its right end position and the piston rod 12 travels into the working cylinder.
If the working piston 3 and therewith also the piston rod 12 are to be arrested in a predetermined position on being extended out of the working cylinder, the lever 27 is brought into a predetermined position by means of the adjusting arrangement 32,33 and the Bowden wire 31 connected to the latter. The working piston 3 and, therewith, the piston rod 12 are moved to the left by pressure medium until the lever 27 connected to the Bowden wire 31 is no longer able to move with the piston rod 12 and is swivelled to the right about its ball-jointed connection (recess 28) arranged in the piston rod 12, so that the valve 16, 37 closes.
It is, of course, also possible to use other components such as, for example, hand levers or threaded spindles as the means for actuating the lever 27.
The push rod 18 guided in the bore 13 of the piston rod 12 and serving as a pressing element can be replaced by a pulling element if, instead of the compression spring 25, a tension spring is used and appropriate means are provided that allow the lever 27 to follow the push rod 18.
Claims (12)
1. A device having an output shaft the position of which is controllable, including:
(i) a piston-and-rod assembly housed and movable in a working cylinder which has a fluid inlet port communicating with one side of the piston, the piston-and-rod assembly including the output shaft,
(ii) a control member arranged to control the position of the piston-and-rod assembly, the control member and the piston-and-rod assembly together forming directional control valve means which so controls fluid pressure around the piston that the piston-and-rod assembly takes up a fixed position relative to the control member when working fluid is present at the inlet port, and
(iii) adjusting means for setting the position of the control member in the working cylinder.
2. A device as claimed in claim 1, wherein the control member is movable, along a bore in the piston-and-rod assembly.
3. A device as claimed in claim 2, wherein the adjusting means for setting the control member includes an actuating element, accommodated in an aperture in the part of the piston rod lying outside the working cylinder, which bears against both the piston rod and the control member for moving the said control member.
4. A device as claimed in claim 3, wherein the actuating element is connected to means, fixed to the outside of the working cylinder, for setting its position.
5. A device having an output shaft the position of which is controllable, including:
(a)(i) a working cylinder divided by a working piston, which has a piston rod, into a first pressure medium chamber adjacent to the piston rod and a second pressure medium chamber arranged on the other sie of the working piston with respect to the first pressure medium chamber, the piston rod providing the output shaft,
(ii) the piston rod having a bore extending in the axial direction;
(iii) the working piston having a bore extending in the axial direction;
(iv) part of the bore arranged in the piston rod being constructed as a valve chamber in which valve means is arranged, by means of which valve means air can be released from a pressure medium.
chamber;
(b) means for actuating the valve;
(c) at least on pressure medium connection in the working cylinder by means of which air can be admitted to the pressure medium chambers;
(d) a pressing or pulling control member, which is guided through at least a portion of the bore in the piston rod, is provided for acutating the valve means;
(e) an opening in the piston rod serves to receive an element for actuating the pressing or pulling, control member, which actuating element is in operational connection with the pressing or pulling control member, and
(f) an adjusting arrangement is connected to the element for actuating the pressing or pulling control member.
6. A device as claimed in any one of claims 1 to 5, wherein the control member is constructed as a push rod which is rigidly connected, at one end, to a valve closure member and, at the other end, to a guide member the guide member being acted upon by a compression spring which is supported in such a manner that the push rod, with the valve closure member is urged towards an end position.
7. A device as claimed in any one of claims 1 to 6, wherein the valve means is constructed as a sliding valve formed from a valve closure member constructed as a slider, two bores which penetrate the piston in a radial direction and three sealing elements, the valve closure member having a throughbore extending in the radial direction and, connected therewith, a bore extending in the axial direction.
8. A device as claimed in any one of claims 5 to 7, wherein the adjusting arrangement is on the housing oftheworking cylinder.
9. A device as claimed in any one of claims 4 to 8, wherein the actuating element is contructed as a lever.
10. A device as claimed in claim 9 wherein the lever which is in operational connection with the pulling or pressing control member is at one end mounted in a dish-like recess in the wall of the piston rod and, at the other end, which projects out of the opening provided in the piston rod is connected by a
Bowden wire to the adjusting arrangement.
11. A device as claimed in any one of claims 1 to 10, wherein the effective surface of the working piston which is remote from the piston rod is larger than the effective surface of the working piston facing the piston rod.
12. A device having an output shaft the position of which is controllable, substantially as herein described with reference to, and as illustrated by, the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19813104478 DE3104478A1 (en) | 1981-02-09 | 1981-02-09 | DEVICE FOR POSITIONING THE WORKING PISTON OF A DOUBLE-ACTING WORK CYLINDER |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2095429A true GB2095429A (en) | 1982-09-29 |
| GB2095429B GB2095429B (en) | 1985-05-09 |
Family
ID=6124374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8203569A Expired GB2095429B (en) | 1981-02-09 | 1982-02-08 | Device having a controllable output shaft |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3104478A1 (en) |
| GB (1) | GB2095429B (en) |
| HU (1) | HU188772B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1067293A3 (en) * | 1999-07-09 | 2003-11-19 | Parker Hannifin Corporation | Electro-hydraulic actuator and method for controlling actuator position |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2597443A (en) * | 1949-08-06 | 1952-05-20 | Arthur E Broughton | Oscillator |
| DE974604C (en) * | 1952-06-17 | 1961-02-23 | Westinghouse Bremsen Ges M B H | Hand brake device with pneumatic or hydraulic auxiliary power support for motor vehicles |
| DE1625465B2 (en) * | 1967-11-30 | 1971-12-16 | Stabilus Industrie- Und Handelsgesellschaft Mbh, 5400 Koblenz | LOCKABLE PNEUMATIC OR HYDROPNEUMATIC SPRING |
| GB1236300A (en) * | 1969-08-01 | 1971-06-23 | P L Porter & Co | Hydraulic locking device |
| DE2036738A1 (en) * | 1970-07-24 | 1972-01-27 | Neuwegfertigung Gmbh Fuer Span | Hydraulic locking device |
| FR2185761B1 (en) * | 1972-05-23 | 1974-07-26 | Cit Alcatel | |
| DE2235592C3 (en) * | 1972-07-20 | 1974-12-05 | Neuweg Fertigung Gmbh Fuer Praezisionstechnik, 7932 Munderkingen | Hydraulic locking device |
| AT347669B (en) * | 1973-11-21 | 1979-01-10 | Isovolta | PROCESS FOR CONTINUOUS MANUFACTURING OF LAMINATED BODIES |
| DE2459340C2 (en) * | 1974-12-16 | 1985-05-23 | Stabilus Gmbh, 5400 Koblenz | Infinitely height adjustable column |
| DE2924733A1 (en) * | 1979-06-20 | 1981-01-15 | Dunkes Gmbh & Co Maschinenfabr | Press piston stroke limitation - by plastic pinion adjusting piston end nut |
-
1981
- 1981-02-09 DE DE19813104478 patent/DE3104478A1/en active Granted
-
1982
- 1982-02-08 HU HU37782A patent/HU188772B/en unknown
- 1982-02-08 GB GB8203569A patent/GB2095429B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| HU188772B (en) | 1986-05-28 |
| DE3104478A1 (en) | 1982-08-19 |
| DE3104478C2 (en) | 1992-05-27 |
| GB2095429B (en) | 1985-05-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |