WO2000012902A1 - Pressure-fluid operated actuator - Google Patents
Pressure-fluid operated actuator Download PDFInfo
- Publication number
- WO2000012902A1 WO2000012902A1 PCT/SE1999/001447 SE9901447W WO0012902A1 WO 2000012902 A1 WO2000012902 A1 WO 2000012902A1 SE 9901447 W SE9901447 W SE 9901447W WO 0012902 A1 WO0012902 A1 WO 0012902A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pistons
- pressure
- piston rod
- cylinder
- working chamber
- Prior art date
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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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
- F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
- F15B15/063—Actuator having both linear and rotary output, i.e. dual action actuator
Definitions
- the present invention relates to a pressure-fluid operated actuator .
- the invention relates to such an actuator of the kind comprising a cylinder which is provided with two end walls, located at mutually opposite ends of said cylinder, and which contains three pistons, mounted on an axially displaceable and rotatably journal- led piston rod, said pistons comprising on the one hand two outer pistons which are located spaced apart in the longitudinal direction of the piston rod and which are mounted in axially fixed positions on the piston rod and each of which defines an outer working chamber, located between the piston in question and the adjacent end wall, and on the other hand an inner piston which is located between said two outer pistons and arranged in thread engagement with the piston rod and which is locked against rotation thereof relatively to the cylinder and defines two inner working chambers, located each between said inner piston and one of the two outer pis- tons, each of said working chambers having a pressure- fluid duct connected thereto for supplying pressure fluid to and drawing off pressure fluid from the working chamber in question.
- an axial movement may be imparted to the piston rod by supplying pressure fluid to one of the two outer working chambers and simultaneously drawing off pressure fluid from the other one of said two working chambers.
- a rotary movement may be imparted to the piston rod by supplying pressure fluid to one of the two inner working chambers and simultaneously drawing off pressure fluid from the other one of those two working chambers.
- the actuator may be utilized to produce a rectilinear move- ment of a member, connected to a portion of the piston rod projecting outside one of the end walls, as well as to produce a rotary movement of said member.
- a pressure-fluid operated actuator of said kind is previously known through US-A 3 823 651.
- the supply of pressure fluid to and the withdrawal of pressure fluid from each of the different working chambers takes place through a duct which extends to the working chamber in question through the jacket wall of the cylinder and terminates in said chamber via an opening provided in said wall.
- a design of the pressure fluid ducts is very unfavourable. It results in a serious restriction of the magnitude of the possible axial movement as well as in restrictions in respect of the rotary movement that may be imparted to the piston rod when the latter is located in different axial positions.
- the invention has for its purpose to provide a new and improved pressure-fluid operated actuator of the kind initially specified which avoids the above disadvantages of the actuator known through US-A 3 823 651.
- each pressure-fluid duct that is connected to an inner working chamber comprises a first portion, having a variable effective length in the longitudinal direction of the piston rod and extending through one of the two outer working chambers from a through passage, provided in the adjacent end wall, and a second portion which is connected to said first portion and is provided in a member, axially moveable in unison with the piston rod, and which terminates in said inner working chamber.
- Said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber may suitably consist of a flexible tube, preferably a helically wound resiliently flexible tube.
- said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber may instead consist of an elastically strechable tube.
- said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber is located in the outer working chamber lying closest to the inner working chamber in question.
- said first portion of one of said two ducts is located in one of the two outer working chambers while said first portion of the other one of said two ducts is located in the other one of the two outer working chambers.
- said second portion of each of said two ducts may suitably be provided in the outer piston located between the inner and the outer working chambers in question.
- the two pressure-fluid ducts that are connected each to one inner working chamber have their said first portions located in the same outer working chamber.
- each of the three pistons as well as the inner surface of the cylinder cooperating with the pistons may have a non-circular cross-sectional shape.
- each of the three pistons as well as the inner surface of the cylinder cooperating with the pistons may have a circular cross-sectional shape, in which case the pistons may be locked against rotation relatively to the cylinder by permanent magnet means provided at the pistons and the cylinder.
- FIG. 1 shows a longitudinal sectional view, taken along line I-I in Figure 2, of a pressure-fluid operated actuator according to a first embodiment of the invention, selected by way of example,
- Figure 2 shows a cross-sectional view, taken along line II-II in Figure 1 , wherein some portions of the actuator have been omitted, and
- Figure 3 shows a longitudinal sectional view, corresponding to Figure 1 , of an actuator according to a second embodiment of the invention, also selected by way of example.
- the actuator shown in Figures 1 and 2 comprises a cylinder 10, two end walls 11 and 12, mounted at mutually opposite ends of said cylinder, a piston rod 14, mounted axially displaceable and rotatable in a central through bore 13 in end wall 11, and three pistons 15, 16 and 17, mounted on the piston rod.
- pistons 15 and 17 which form two outer pistons, are mounted in axially fixed and spaced apart positions on piston rod 14 which is rotatably journalled in said two pistons.
- Piston 16 which forms an inner piston, is mounted on a threaded portion 22 of piston rod 14, located between the two outer pistons 15 and 17, and is provided with an internal thread by means of which it is arranged in thread engagement with piston rod portion 22.
- each piston has a non-circular outer contour and the inner surface of cylinder 10, cooperating with the pis- tons, has a corresponding cross-sectional shape.
- the pistons and the inner cylinder surface have a polygonal cross-sectional shape.
- Pistons 15, 16 and 17 divide the inner space of cylinder 10 into four different working chambers 23, 24, 25 and 26.
- Chambers 23 and 26 form two outer working chambers which are located each between one of the two outer pistons 15 and 17 and tho adjacent end w ⁇ i 11 11 and 12, respectively, while chambers 24 and 25 form two inner working chambers which are located each between the inner piston 16 and one of the two outer pistons 15 and 17, respectively.
- Each piston 15, 16 and 17, respectively is provided with an annular sealing member 27, 28 and 29, respectively, which is mounted in an outer peripheral groove in the piston and makes sealing contact with the inner surface of cylinder 10.
- a sealing member 34 and 35 is placed between each end wall and the adjacent end portion of the cylinder.
- two annular sealing members 36 and 37 are provided in bore 13 in end wall 11 in sealing contact with piston rod 14.
- ducts connected to the two outer working chambers 23 and 26 simply consist of through passages 38 and 39, respectively, provided m the two end walls 11 and 12, respectively, while the ducts connected to the two inner working chambers 24 and 25 have a more complicated structure.
- the pressure-fluid duct connected to working chamber 24 comprises a first portion, connected to said passage and formed by a helically wound resi- liently flexible tube 41 which extends through working chamber 23 and has a variable effective length in the longitudinal direction of piston rod 14, and a second portion, connected to said first portion and formed 00/12902
- the above-described actuator may be utilized to impart to a member, mounted on an end portion of piston rod 14 projecting outside end wall 11, a rectilinear movement in the longitudinal direction of the piston rod as well as a rotary movement around the longitudinal axis of the piston rod.
- a rectilinear movement of piston rod 14 in one or the other direction may be caused by supplying pressure fluid to one of the two outer working chambers 23, 26 and simultaneously withdrawing pressure fluid from the other one of said two working chambers, while a rotation of piston rod 14 in one or the other direction may be caused by supplying pressure fluid to one of the two inner working chambers 24, 25 and simultaneously withdrawing pressure fluid from the other one of said two working chambers.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
A pressure-fluid operated actuator comprises a cylinder (10), two end walls (11, 12), located at opposite ends of the cylinder, and three pistons (15, 16, 17), mounted on an axially displaceable and rotatably journalled piston rod (14) and consisting on the one hand of two outer pistons (15, 17) which are mounted in axially fixed positions on the piston rod (14) and define two outer working chambers (23, 26), each of which being located adjacent to one end wall (11, 12), and on the other hand an inner piston (16) which is located between the two outer pistons (15, 17) and arranged in thread engagement with the piston rod (14) and which is locked against rotation thereof relatively to the cylinder (10) and defines two inner working chambers (24, 25), located each between the inner piston and one of the two outer pistons (15, 17). Each inner working chamber (24, 25) is connected to a pressure-fluid duct comprising a first portion (41, 44), having a variable effective length in the longitudinal direction of the piston rod (14) and extending through one of the two outer working chambers (23, 26) from a through passage (40, 43), provided in the adjacent end wall (11, 12), and a second portion (42, 45) which is provided in a member (15, 17), axially moveable in unison with the piston rod (14), and which terminates in said inner working chamber (24, 25).
Description
Pressure-fluid operated actuator
The present invention relates to a pressure-fluid operated actuator .
More particularly, the invention relates to such an actuator of the kind comprising a cylinder which is provided with two end walls, located at mutually opposite ends of said cylinder, and which contains three pistons, mounted on an axially displaceable and rotatably journal- led piston rod, said pistons comprising on the one hand two outer pistons which are located spaced apart in the longitudinal direction of the piston rod and which are mounted in axially fixed positions on the piston rod and each of which defines an outer working chamber, located between the piston in question and the adjacent end wall, and on the other hand an inner piston which is located between said two outer pistons and arranged in thread engagement with the piston rod and which is locked against rotation thereof relatively to the cylinder and defines two inner working chambers, located each between said inner piston and one of the two outer pis- tons, each of said working chambers having a pressure- fluid duct connected thereto for supplying pressure fluid to and drawing off pressure fluid from the working chamber in question.
In an actuator of said kind, an axial movement may be imparted to the piston rod by supplying pressure fluid to one of the two outer working chambers and simultaneously drawing off pressure fluid from the other one of said two working chambers. Moreover, a rotary movement may be imparted to the piston rod by supplying pressure fluid to one of the two inner working chambers and simultaneously drawing off pressure fluid from the other one of those two working chambers. Hereby, the actuator may be utilized to produce a rectilinear move-
ment of a member, connected to a portion of the piston rod projecting outside one of the end walls, as well as to produce a rotary movement of said member.
A pressure-fluid operated actuator of said kind is previously known through US-A 3 823 651. in this known actuator, the supply of pressure fluid to and the withdrawal of pressure fluid from each of the different working chambers takes place through a duct which extends to the working chamber in question through the jacket wall of the cylinder and terminates in said chamber via an opening provided in said wall. However, in practice, such a design of the pressure fluid ducts is very unfavourable. It results in a serious restriction of the magnitude of the possible axial movement as well as in restrictions in respect of the rotary movement that may be imparted to the piston rod when the latter is located in different axial positions. Furthermore, it also causes disadvantages with regard to the installation as external pressure-fluid conduits leading to each of said ducts have to be provided outside the cylinder .
The invention has for its purpose to provide a new and improved pressure-fluid operated actuator of the kind initially specified which avoids the above disadvantages of the actuator known through US-A 3 823 651.
The actuator, according to the invention proposed for said purpose, is primarily characterized in that each pressure-fluid duct that is connected to an inner working chamber comprises a first portion, having a variable effective length in the longitudinal direction of the piston rod and extending through one of the two outer working chambers from a through passage, provided in the adjacent end wall, and a second portion which is connected to said first portion and is provided in a
member, axially moveable in unison with the piston rod, and which terminates in said inner working chamber.
Through the invention, the previous need for ducts, extending through the jacket wall of the cylinder, for supplying pressure fluid to and withdrawing pressure fluid from the two inner working chambers is eliminated and hence, also the above-described disadvantages associated with the use of such ducts .
Said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber may suitably consist of a flexible tube, preferably a helically wound resiliently flexible tube. Alternatively, said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber may instead consist of an elastically strechable tube.
In a first embodiment of the invention, said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber is located in the outer working chamber lying closest to the inner working chamber in question. This means that said first portion of one of said two ducts is located in one of the two outer working chambers while said first portion of the other one of said two ducts is located in the other one of the two outer working chambers. In this case, said second portion of each of said two ducts may suitably be provided in the outer piston located between the inner and the outer working chambers in question. In a second embodiment of the invention, the two pressure-fluid ducts that are connected each to one inner working chamber have their said first portions located in the same outer working chamber.
In the actuator previously known through US-A 3 823 651, the two axial pistons are rigidly connected
to the piston rod, whereby, when a rotary movement is imparted to the piston rod, they are forced to carry out a corresponding rotary movement. In practice, this is very unfavourable due to the fact that it will cause high friction losses at the sealings between the axial pistons and the cylinder when the piston rod is rotated. In an actuator according to the present invention, such a rigid connection between the axial pistons and the piston rod would however also make it substantially more difficult to effect the proposed above-described division of each pressure-fluid duct, connected to an inner working chamber, into a first portion and a second portion, connected to said first portion.
In order to avoid these disadvantages, according to the invention, it is proposed that the piston rod should be rotatably journalled in the two outer pistons which, similarly to the inner piston, should be locked against rotation relatively to the cylinder. For this purpose, each of the three pistons as well as the inner surface of the cylinder cooperating with the pistons may have a non-circular cross-sectional shape. Alternatively, each of the three pistons as well as the inner surface of the cylinder cooperating with the pistons may have a circular cross-sectional shape, in which case the pistons may be locked against rotation relatively to the cylinder by permanent magnet means provided at the pistons and the cylinder.
Below the invention is described in further detail with reference to the accompanying drawings, in which: - Figure 1 shows a longitudinal sectional view, taken along line I-I in Figure 2, of a pressure-fluid operated actuator according to a first embodiment of the invention, selected by way of example,
Figure 2 shows a cross-sectional view, taken along line II-II in Figure 1 , wherein some portions of the
actuator have been omitted, and
Figure 3 shows a longitudinal sectional view, corresponding to Figure 1 , of an actuator according to a second embodiment of the invention, also selected by way of example.
The actuator shown in Figures 1 and 2 comprises a cylinder 10, two end walls 11 and 12, mounted at mutually opposite ends of said cylinder, a piston rod 14, mounted axially displaceable and rotatable in a central through bore 13 in end wall 11, and three pistons 15, 16 and 17, mounted on the piston rod.
By means of locking rings 18, 19 and 20, 21, respectively, pistons 15 and 17, which form two outer pistons, are mounted in axially fixed and spaced apart positions on piston rod 14 which is rotatably journalled in said two pistons. Piston 16, which forms an inner piston, is mounted on a threaded portion 22 of piston rod 14, located between the two outer pistons 15 and 17, and is provided with an internal thread by means of which it is arranged in thread engagement with piston rod portion 22. In order to lock all three pistons 15, 16 and 17 against rotation relatively to cylinder 10, each piston has a non-circular outer contour and the inner surface of cylinder 10, cooperating with the pis- tons, has a corresponding cross-sectional shape. In the illustrated case, the pistons and the inner cylinder surface have a polygonal cross-sectional shape.
Pistons 15, 16 and 17 divide the inner space of cylinder 10 into four different working chambers 23, 24, 25 and 26. Chambers 23 and 26 form two outer working chambers which are located each between one of the two outer pistons 15 and 17 and tho adjacent end wεi 11 11 and 12, respectively, while chambers 24 and 25 form two inner working chambers which are located each between the inner piston 16 and one of the two outer pistons 15
and 17, respectively.
Each piston 15, 16 and 17, respectively, is provided with an annular sealing member 27, 28 and 29, respectively, which is mounted in an outer peripheral groove in the piston and makes sealing contact with the inner surface of cylinder 10. Moreover, there are provided three sealing members 30, 31 and 32 which serve to produce sealed connections between pistons 15, 16 and 17 and piston rod 14. In order to provide sealed connections between cylinder 10 and the two end walls 11 and 12, which are fixed to the cylinder by means of screws 33, a sealing member 34 and 35, respectively, is placed between each end wall and the adjacent end portion of the cylinder. Furthermore, two annular sealing members 36 and 37, respectively, are provided in bore 13 in end wall 11 in sealing contact with piston rod 14.
In order to facilitate a supply of pressure fluid to and a withdrawal of pressure fluid from the different working chambers 23, 24, 25 and 26, there are provided four pressure-fluid ducts which are connected each to one of said chambers. The ducts connected to the two outer working chambers 23 and 26 simply consist of through passages 38 and 39, respectively, provided m the two end walls 11 and 12, respectively, while the ducts connected to the two inner working chambers 24 and 25 have a more complicated structure.
More particularly, m addition to a through passage 40 m end wall 11, the pressure-fluid duct connected to working chamber 24 comprises a first portion, connected to said passage and formed by a helically wound resi- liently flexible tube 41 which extends through working chamber 23 and has a variable effective length in the longitudinal direction of piston rod 14, and a second portion, connected to said first portion and formed
00/12902
7
by a through bore 42 in piston 15, which is axially moveable in unison with the piston rod, and terminating in chamber 24. In a corresponding manner the pressure- fluid duct connected to working chamber 25 comprises, in addition to a through passage 43 in end wall 12, a first portion formed by a helically wound resiliently flexible tube 44 which extends through working chamber 26 and has a variable effective length in the longitudinal direction of the piston rod, and a second portion, formed by a through bore 45 m piston 17 and terminating m chamber 25.
The above-described actuator may be utilized to impart to a member, mounted on an end portion of piston rod 14 projecting outside end wall 11, a rectilinear movement in the longitudinal direction of the piston rod as well as a rotary movement around the longitudinal axis of the piston rod. A rectilinear movement of piston rod 14 in one or the other direction may be caused by supplying pressure fluid to one of the two outer working chambers 23, 26 and simultaneously withdrawing pressure fluid from the other one of said two working chambers, while a rotation of piston rod 14 in one or the other direction may be caused by supplying pressure fluid to one of the two inner working chambers 24, 25 and simultaneously withdrawing pressure fluid from the other one of said two working chambers. Piston rod 14 may be brought to carry out movements of said two kinds simultaneously as well as only one at a time. The maximum rnovability of piston rod 14 in the longitudinal direction of said rod is limited by two stop means 46 and 47, mounted on end wall 11, while the maximum rotary movement of the piston rod is limited by two stop means 48 and 49, mounted on piston rod 14 adjacent to respective ones of the two outer pistons 15 and 17. The embodiment shown in Figure 3 differs from
the embodiment shown in Figures 1 and 2 and above described only in respect of the location and design of the pressure-fluid duct connected to inner working chamber 24. In the embodiment shown in Figure 3, the through passage in an end wall forming part of said duct is provided in end wall 12 instead of in end wall 11. Furthermore, flexible tube 41 is located in outer working chamber 26 instead of in chamber 23. Moreover, bore 42 in piston 15 has been replaced by a tube 42' which is mounted in piston 17 and extends through a through bore 50 in piston 16 and which terminates in chamber 24 at a short distance from the inner side of piston 15. In order to provide a sealed connection between tube 42' and piston 16, which is axially moveable in relation to said tube, an annular sealing members 51 is mounted in a groove in the wall of bore 50.
The invention is not restricted to the embodiments above described and shown in the drawings. Instead, many other embodiments are feasible within the scope of the invention as defined in the following claims. For instance, it could be mentioned that said first portion of one or each of the two pressure-fluid ducts that are connected each to one inner working chamber may be formed by an elastically strechable tube or a tele- scopic tube instead of a helically wound resiliently flexible tube. Furthermore, the pistons and the cooperating inner surface of the cylinder need not have a non- circular cross-sectional shape. The pistons and the inner cylinder surface may also have a circular cross- sectional shape if the pistons are locked against rotation relatively to the cylinder in any other manner, for instance by permanent magnet means affixed to the pistons and the cylinder.
Claims
1. Pressure-fluid operated actuator, comprising a cylinder (10) which is provided with two end walls (11, 12), located at mutually opposite ends of said cylinder, and which contains three pistons (15, 16, 17), mounted on an axially displaceable and rotatably journal- led piston rod (14), said pistons comprising on the one hand two outer pistons (15, 17) which are located spaced apart in the longitudinal direction of the piston rod (14) and which are mounted in axially fixed positions on the piston rod (14) and each of which defines an outer working chamber (23, 26), located between the piston in question and the adjacent end wall (11, 12), and on the other hand an inner piston (16) which is located between said two outer pistons (15, 17) and arranged in thread engagement with the piston rod (14) and which is locked against rotation thereof relatively to the cylinder (10) and defines two inner working chambers (24, 25), located each between said inner piston and one of the two outer pistons (15, 17), each of said working chambers (23, 24, 25, 26) having a pressure-fluid duct (38, 40, 41, 42, 43, 44, 45, 39) connected thereto for supplying pressure fluid to and drawing off pressure fluid from the working chamber in question, characterized in that each pressure-fluid duct that is connected to an inner working chamber (24, 25) comprises a first portion (41, 44), having a variable effective length in the longitudinal direction of the piston rod (14) and extending through one of the two outer working chambers (23, 26) from a through passage (40, 43), provided in the adjacent end wall (11, 12), and a second portion (42, 45) which is connected to said first portion (41, 44) and is provided in a member (15, 17), axially movable in unison with the piston rod (14), and which terminates in said inner working chamber (24, 25). 0/12902
1 0
2. Actuator according to claim 1, characterized in that said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber (24, 25) consists of a flexible tube (41 , 44) .
3. Actuator according to claim 2, characterized in that said flexible tube consists of a helically wound resiliently flexible tube (41, 44).
4. Actuator according to claim 1, characterized in that said first portion of at least one of the two pressure-fluid ducts that are connected each to one inner working chamber consists of an elastically strechable tube .
5. Actuator according to any of the preceding claims, characterized in that said first portion (41, 44) of each of the two pressure-fluid ducts that are connected each to one inner working chamber (24, 25) is located in the outer working chamber (23, 26) lying closest to the inner working chamber (24, 25) in question.
6. Actuator according to claim 5, characterized in that said second portion (42, 45) of each of said two pressure-fluid ducts is provided in the outer piston (15, 17) located between the inner and outer working chambers (23, 24 and 25, 26, respectively) in question.
7. Actuator according to any of claims 1 to 4 , characterized in that the two pressure-fluid ducts that are connected each to one inner working chamber (24, 25) have their said first portions (41, 44) located in the same outer working chamber (26).
8. Actuator according to any of the preceding claims, characterized in that the piston rod (14) is rotatably journalled in the two outer pistons (15, 17) which, similarly to the inner piston (16), are locked against rotation relatively to the cylinder (10).
9. Actuator according to claim 8, characterized in that each of the three pistons (15, 16, 17) as well as the inner surface of the cylinder (10) cooperating with the pistons has a non-circular cross-sectional shape .
10. Actuator according to claim 8, characterized in that each of the three pistons as well as the inner surface of the cylinder cooperating with the pistons has a circular cross-sectional shape, the pistons being locked against rotation relatively to the cylinder by permanent magnet means provided at the pistons and the cylinder .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU58906/99A AU5890699A (en) | 1998-08-26 | 1999-08-25 | Pressure-fluid operated actuator |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9802851A SE512573C2 (en) | 1998-08-26 | 1998-08-26 | Pressurized fluid actuator |
| SE9802851-7 | 1998-08-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000012902A1 true WO2000012902A1 (en) | 2000-03-09 |
Family
ID=20412359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SE1999/001447 WO2000012902A1 (en) | 1998-08-26 | 1999-08-25 | Pressure-fluid operated actuator |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU5890699A (en) |
| SE (1) | SE512573C2 (en) |
| WO (1) | WO2000012902A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102665958A (en) * | 2009-10-28 | 2012-09-12 | 卢布尔雅那大学 | Apparatus for retaining a package of laminations of an electromagnetic core in a device for the production thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3610107A (en) * | 1969-08-18 | 1971-10-05 | Daiei Kogyo Sha Co Ltd | Torque cylinder |
| US3823651A (en) * | 1971-08-06 | 1974-07-16 | Girling Ltd | Hydraulic assemblies |
-
1998
- 1998-08-26 SE SE9802851A patent/SE512573C2/en not_active IP Right Cessation
-
1999
- 1999-08-25 WO PCT/SE1999/001447 patent/WO2000012902A1/en active Application Filing
- 1999-08-25 AU AU58906/99A patent/AU5890699A/en not_active Abandoned
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3610107A (en) * | 1969-08-18 | 1971-10-05 | Daiei Kogyo Sha Co Ltd | Torque cylinder |
| US3823651A (en) * | 1971-08-06 | 1974-07-16 | Girling Ltd | Hydraulic assemblies |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102665958A (en) * | 2009-10-28 | 2012-09-12 | 卢布尔雅那大学 | Apparatus for retaining a package of laminations of an electromagnetic core in a device for the production thereof |
| US8875385B2 (en) | 2009-10-28 | 2014-11-04 | Univerza V Ljubljani | Apparatus for retaining a package of laminations of an electromagnetic core in a device for the production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| SE9802851D0 (en) | 1998-08-26 |
| SE9802851L (en) | 2000-02-27 |
| AU5890699A (en) | 2000-03-21 |
| SE512573C2 (en) | 2000-04-03 |
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