CA1141626A - Apparatus for setting the position of a device provided with a plurality of adjusting hydraulic cylinders - Google Patents
Apparatus for setting the position of a device provided with a plurality of adjusting hydraulic cylindersInfo
- Publication number
- CA1141626A CA1141626A CA000325193A CA325193A CA1141626A CA 1141626 A CA1141626 A CA 1141626A CA 000325193 A CA000325193 A CA 000325193A CA 325193 A CA325193 A CA 325193A CA 1141626 A CA1141626 A CA 1141626A
- Authority
- CA
- Canada
- Prior art keywords
- piston rod
- hydraulic
- pump
- piston
- cylinder
- 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.)
- Expired
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
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/06—Details
- F15B7/08—Input units; Master units
-
- 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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/22—Synchronisation of the movement of two or more servomotors
-
- 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
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/003—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors with multiple outputs
-
- 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
- F15B7/00—Systems in which the movement produced is definitely related to the output of a volumetric pump; Telemotors
- F15B7/005—With rotary or crank input
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Actuator (AREA)
- Mechanical Control Devices (AREA)
- Fish Paste Products (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
A B S T R A C T
An apparatus for setting the position of a device pro-vided with a plurality of adjusting hydraulic cylinders (16) by simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said device. Each of the hydraulic cylinders communicates with a respective displacement chamber in a hydraulic pump which is common to all hydraulic cylinders. The pump comprises a cylinder and a piston rod axially displaceable therein. The piston rod is stepped to form a plurality of annular, concentrical piston surfaces, and the inner diameter of the cylinder is stepped in a corresponding manner to the piston rod. This results in that there is formed in front of each piston surface a displacement chamber. The chambers are mutually sealed during a working stroke of the pump.
An apparatus for setting the position of a device pro-vided with a plurality of adjusting hydraulic cylinders (16) by simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said device. Each of the hydraulic cylinders communicates with a respective displacement chamber in a hydraulic pump which is common to all hydraulic cylinders. The pump comprises a cylinder and a piston rod axially displaceable therein. The piston rod is stepped to form a plurality of annular, concentrical piston surfaces, and the inner diameter of the cylinder is stepped in a corresponding manner to the piston rod. This results in that there is formed in front of each piston surface a displacement chamber. The chambers are mutually sealed during a working stroke of the pump.
Description
z~
Thomas Bernhard Andersson An apparatus for setting the position of a device provided with a plurality of adjusting hydraulic cylinders The present invention relates to an apparatus for setting S the position of a device provided with a plurality of adjusting hydraulic cylinders by simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said device.
In order to allow the level of a working table or the like /~ to be adjusted, the legs of the table or the frame structure thereof are made telescopically raisable and lowerable. Previous-ly, the adjustment has normally been done mechanically. It has also been pro~osed, however, to effect this adjustment hydrauli-cally. Then a hydraulic cylinder arrangement has been assigned to each leg which is to be adjusted ver~cally. In order ~or the table top to move in a parallel movement, it is necessary for all hydraulic cylinders to be supplied with the same amount of oil, assuming that they have the same area. Since it is possible that the various legs may carry different loads, it is not poss-O ible to supply the hydraulic cylinders from a conventional hy-draulic pump with branch lines. In accordance with an earlier proposal, there has been arranged instead a multivlicity of se-parate hydraulic pumps, each in the form of a hydraulic cylinder with an associated piston rod in side by side relationship. In ~5 this arrangement, the piston rods must be displaced exactly uniformly in order to obtain the same output flow from each cy-linder. If, however, the loads acting on the cylinders which respective piston pumps are to supply vary greatly, ~roblems can arise in this type of arrangement as a result of uneven load-3~ iny, since the force with which the piston rods of the differenthydraulic pumps must be actuated will also vary greatly.
A main object of the present invention is to eliminate among : other things the above mentioned drawbacks of prior art equipment and to obtain an apparatus for setting the position of ~- a device provided with a plurality of adjusting hydraulic cylinders which output the desired quantity of hydraulic medium to each cylinder irrespective of the pressure in the respective~
cylinder and which eliminates problems resulting from unev . . ~
loading. In addition to its application to tables, the invention can also be applied to all kinds of objects arranged to be ad-justed by means of at least two hydraulic cylinders.
In accordance with the invention there is provided a height adjustable table for use as a data terminal or the like, comprising a plurality of supporting legs and a table top, a plurality of height adjusting hydraulic cylinders, one said cylinder being provided in each said leg, and means for simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said table, said hydraulic cylinders each communicating with a respective displacement chamber of a single hydraulic pump loeated on said table top, said pump being common to all said hydraulic cylinders and comprising a pump cylinder and a piston rod axially displaceable therein, wherein the piston rod is stepped to form a plurality of annular, coneentrical piston surfaces and the inner diameter of the pump cylinder is stepped in a eorresponding manner to the piston rod, such that there is formed in front of each piston surface a displacement chamber, said chambers being simultaneously mutually sealed at the beginning of a working stroke of the pump, and being maintained in mutually sealed relationship during said working stroke, whereby equal quantities of hydraulic medium are supplied to each said hydraulic cylinder, thereby maintaining the table level regardless of any unevenness of load thereon.
By the French patent specifications 1,235,486 and 1,575,806, hydraulie eylinders are previously known, the piston rods of whieh are provided with a plurality of piston means. However, the struc-ture of the prior art devices are relatively complicated and among other things they have to be made in several sections.
Thus, both the manufacturing and the mounting of hydraulic cy-linders having that type of piston means are relatively time consuming and cost demanding. Further, a great number of sealing surfaces and sealing means are required. The risk of leakages is increased with each sealing surface.
The above problems are solved by the present invention according to which the piston rod is stepped to form a plurality - 2a -of annular, concentrical piston surfaces,and the inner diameter of the cylinder is stepped in a corresponding manner to the piston rod, such that there is formed in front of each piston surface a displacement chamber, said chambers being mutually sealed during a working stroke of the pump.
Both the piston rod with piston means and the surrounding cylinder can readily be manufactured in one pi~ce by simple machining techniques.
By gi~ing the piston means the same area, part-flows of exactly the same magnitude can be obtained from each chamber.
Alternatively the flows can be adjusted in the desired manner relative to one another by varying said areas.
It is preferred that a sealing element surrounds the piston rod behind each step and in that the inner surface of the cyl;nder is provided with means leaking hydraulic medium between adjacent chambers when the piston rod is pulled back.
This facilitates filling of the pump with hydraulic medium.
.. _ _ . , . .. ... ..... . .. _ ,. _ _ _,__ _ _ _ . ~ . . ~ .
, So that the invention will be more readily understood and optional features thereof made apparent, an exemplary em-bodiment thereof will now be described with reference to the accompanying schematic drawing, in ~hich Figure 1 is a longi-S tudinal sectional view through a hydraulic pump used in an appa-ratus according to the invention, and Figure 2 illustrates one manner of application of an apparatus according to the invention.
The hydraulic pump illustrated-in Figure 1 is of the ois-ton type and is generally identified by the reference 1. The pump /0 comprises a plurality of piston means, which have the form of step surfaces or shoulders 2 located on a common central body 3, serving as a piston rod. The piston rod 3 provided with said shoulders is arranged in a correspondingly steoped cylinder housing 4, such that in the illustrated position of the piston rod in Figure 1 there is formed between the piston rod 3 and the cylinder 4 before each shoulder 2 serving as piston means a peripherally extending chamber 5. Arranged behind each piston means 2 is a sealing element 6 in the form of an O-ring, said sealing element being located in a peripheral groove in the a O piston rod 3 and being in sealing contact with the wall of the cylinder 4. Each chamber 5 is provided with a separate connecting channel 7, through which hydraulic oil can be oumped out or supplied.
In the illustrated embodiment, the piston rod 3 is arranged ~5 to be operated by means of a spindle 8 which is provided with a pin 10 which can be screwed into a hole 9 in the oiston rod 3.
The spindle can be turned by means of a knob 11 or like element, this turning movement being converted into an axial displacement of the piston rod 3 as a result of the screw engagement between 3 the pin 10 and the hole 9. The references 12 and 13 identify bearing means for taking up radial and axial forces respectively.
The aforedescribed hydraulic pump has the same effect as four separate pumps, as respective piston means 2 discharge an individual flow of oil from the associated chamber 5 through re-3 S soective connection 7. Before oil can be discharged, however,it is obvious that the pump must be filled with oil, which can be effected in different ways. For example, lines coupled to the connection 7 can be immersed in a container filled with oil and oil drawn into the chambers of the pump as the piston rod 3 is ~. ' .
withdrawn, or separate filling passages can be arranged for this purpose. Preferably the inner surface of the cylinder 4 is pro-vided with means, e.g. grooves, leaking hydraulic medium between adjacent chambers 5 when the piston rod 3 is pulled back for S filling purposes. In one embodiment the piston rod 3 can be arranged to be drawn back a further distance than illustrated resulting in that the respective O-ring 6 passes the inclined first portion of each step and full communication between said chambers 5 in the filling position.
/0 If all the piston means 2 have the same area, orecisely equal quantities of oil can be discharged through respective connections 7, irrespective of any counterpressure in the lines.
If a higher pressure prevails in one line than in the others, this higher pressure will not cause the corresponding piston /5 means to drag, since all piston means are rigidly connected to the same piston rod 3. All forces which occur will also be cen-tralized to the common piston rod 3, and hence no problems will manifest themselves as a result of uneven loading or the like.
A hydraulic pumo constructed in the aforedescribed manner is o e~tremely compact and simple to use and to manufacture.
Figure 2 illustrates a manner of application of a hy-draulic pump constructed in accordance with the embodiment illustrated in Figure 1. In the Figure 2 embodiment, the hydrau-lic pump 1 is mounted on a vertically adjustable data-terminal table. Each of the legs of the table is in the form of two -tele-scooically arranged sections 1~, 15, which can be displaced relative to one another by means of a hydraulic cylinder 16 arranged in respective leg. Each hydraulic cylinder communicates, through a line 17, with an associated chamber 5 in the hydrau-3 o lic pump 1, which pump can be arranged in a readily accessibleplace. By rotating the operating knob 11, the table top can be moved in a parallel pattern of movement vertically, i.e. it can both be raised and lowered, depending upon the direction in which the knob 11 is turned, An uneven load on the table top will not affect its setting in the horizontal plane.
The hydraulic pump illustrated in Figure 1 can be used, however, in many other ccnnections, where it is desired to dis-pense equal or given volumes to different lines. Thus, in this latter case the piston means 2 shall not have the same area, but
Thomas Bernhard Andersson An apparatus for setting the position of a device provided with a plurality of adjusting hydraulic cylinders The present invention relates to an apparatus for setting S the position of a device provided with a plurality of adjusting hydraulic cylinders by simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said device.
In order to allow the level of a working table or the like /~ to be adjusted, the legs of the table or the frame structure thereof are made telescopically raisable and lowerable. Previous-ly, the adjustment has normally been done mechanically. It has also been pro~osed, however, to effect this adjustment hydrauli-cally. Then a hydraulic cylinder arrangement has been assigned to each leg which is to be adjusted ver~cally. In order ~or the table top to move in a parallel movement, it is necessary for all hydraulic cylinders to be supplied with the same amount of oil, assuming that they have the same area. Since it is possible that the various legs may carry different loads, it is not poss-O ible to supply the hydraulic cylinders from a conventional hy-draulic pump with branch lines. In accordance with an earlier proposal, there has been arranged instead a multivlicity of se-parate hydraulic pumps, each in the form of a hydraulic cylinder with an associated piston rod in side by side relationship. In ~5 this arrangement, the piston rods must be displaced exactly uniformly in order to obtain the same output flow from each cy-linder. If, however, the loads acting on the cylinders which respective piston pumps are to supply vary greatly, ~roblems can arise in this type of arrangement as a result of uneven load-3~ iny, since the force with which the piston rods of the differenthydraulic pumps must be actuated will also vary greatly.
A main object of the present invention is to eliminate among : other things the above mentioned drawbacks of prior art equipment and to obtain an apparatus for setting the position of ~- a device provided with a plurality of adjusting hydraulic cylinders which output the desired quantity of hydraulic medium to each cylinder irrespective of the pressure in the respective~
cylinder and which eliminates problems resulting from unev . . ~
loading. In addition to its application to tables, the invention can also be applied to all kinds of objects arranged to be ad-justed by means of at least two hydraulic cylinders.
In accordance with the invention there is provided a height adjustable table for use as a data terminal or the like, comprising a plurality of supporting legs and a table top, a plurality of height adjusting hydraulic cylinders, one said cylinder being provided in each said leg, and means for simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said table, said hydraulic cylinders each communicating with a respective displacement chamber of a single hydraulic pump loeated on said table top, said pump being common to all said hydraulic cylinders and comprising a pump cylinder and a piston rod axially displaceable therein, wherein the piston rod is stepped to form a plurality of annular, coneentrical piston surfaces and the inner diameter of the pump cylinder is stepped in a eorresponding manner to the piston rod, such that there is formed in front of each piston surface a displacement chamber, said chambers being simultaneously mutually sealed at the beginning of a working stroke of the pump, and being maintained in mutually sealed relationship during said working stroke, whereby equal quantities of hydraulic medium are supplied to each said hydraulic cylinder, thereby maintaining the table level regardless of any unevenness of load thereon.
By the French patent specifications 1,235,486 and 1,575,806, hydraulie eylinders are previously known, the piston rods of whieh are provided with a plurality of piston means. However, the struc-ture of the prior art devices are relatively complicated and among other things they have to be made in several sections.
Thus, both the manufacturing and the mounting of hydraulic cy-linders having that type of piston means are relatively time consuming and cost demanding. Further, a great number of sealing surfaces and sealing means are required. The risk of leakages is increased with each sealing surface.
The above problems are solved by the present invention according to which the piston rod is stepped to form a plurality - 2a -of annular, concentrical piston surfaces,and the inner diameter of the cylinder is stepped in a corresponding manner to the piston rod, such that there is formed in front of each piston surface a displacement chamber, said chambers being mutually sealed during a working stroke of the pump.
Both the piston rod with piston means and the surrounding cylinder can readily be manufactured in one pi~ce by simple machining techniques.
By gi~ing the piston means the same area, part-flows of exactly the same magnitude can be obtained from each chamber.
Alternatively the flows can be adjusted in the desired manner relative to one another by varying said areas.
It is preferred that a sealing element surrounds the piston rod behind each step and in that the inner surface of the cyl;nder is provided with means leaking hydraulic medium between adjacent chambers when the piston rod is pulled back.
This facilitates filling of the pump with hydraulic medium.
.. _ _ . , . .. ... ..... . .. _ ,. _ _ _,__ _ _ _ . ~ . . ~ .
, So that the invention will be more readily understood and optional features thereof made apparent, an exemplary em-bodiment thereof will now be described with reference to the accompanying schematic drawing, in ~hich Figure 1 is a longi-S tudinal sectional view through a hydraulic pump used in an appa-ratus according to the invention, and Figure 2 illustrates one manner of application of an apparatus according to the invention.
The hydraulic pump illustrated-in Figure 1 is of the ois-ton type and is generally identified by the reference 1. The pump /0 comprises a plurality of piston means, which have the form of step surfaces or shoulders 2 located on a common central body 3, serving as a piston rod. The piston rod 3 provided with said shoulders is arranged in a correspondingly steoped cylinder housing 4, such that in the illustrated position of the piston rod in Figure 1 there is formed between the piston rod 3 and the cylinder 4 before each shoulder 2 serving as piston means a peripherally extending chamber 5. Arranged behind each piston means 2 is a sealing element 6 in the form of an O-ring, said sealing element being located in a peripheral groove in the a O piston rod 3 and being in sealing contact with the wall of the cylinder 4. Each chamber 5 is provided with a separate connecting channel 7, through which hydraulic oil can be oumped out or supplied.
In the illustrated embodiment, the piston rod 3 is arranged ~5 to be operated by means of a spindle 8 which is provided with a pin 10 which can be screwed into a hole 9 in the oiston rod 3.
The spindle can be turned by means of a knob 11 or like element, this turning movement being converted into an axial displacement of the piston rod 3 as a result of the screw engagement between 3 the pin 10 and the hole 9. The references 12 and 13 identify bearing means for taking up radial and axial forces respectively.
The aforedescribed hydraulic pump has the same effect as four separate pumps, as respective piston means 2 discharge an individual flow of oil from the associated chamber 5 through re-3 S soective connection 7. Before oil can be discharged, however,it is obvious that the pump must be filled with oil, which can be effected in different ways. For example, lines coupled to the connection 7 can be immersed in a container filled with oil and oil drawn into the chambers of the pump as the piston rod 3 is ~. ' .
withdrawn, or separate filling passages can be arranged for this purpose. Preferably the inner surface of the cylinder 4 is pro-vided with means, e.g. grooves, leaking hydraulic medium between adjacent chambers 5 when the piston rod 3 is pulled back for S filling purposes. In one embodiment the piston rod 3 can be arranged to be drawn back a further distance than illustrated resulting in that the respective O-ring 6 passes the inclined first portion of each step and full communication between said chambers 5 in the filling position.
/0 If all the piston means 2 have the same area, orecisely equal quantities of oil can be discharged through respective connections 7, irrespective of any counterpressure in the lines.
If a higher pressure prevails in one line than in the others, this higher pressure will not cause the corresponding piston /5 means to drag, since all piston means are rigidly connected to the same piston rod 3. All forces which occur will also be cen-tralized to the common piston rod 3, and hence no problems will manifest themselves as a result of uneven loading or the like.
A hydraulic pumo constructed in the aforedescribed manner is o e~tremely compact and simple to use and to manufacture.
Figure 2 illustrates a manner of application of a hy-draulic pump constructed in accordance with the embodiment illustrated in Figure 1. In the Figure 2 embodiment, the hydrau-lic pump 1 is mounted on a vertically adjustable data-terminal table. Each of the legs of the table is in the form of two -tele-scooically arranged sections 1~, 15, which can be displaced relative to one another by means of a hydraulic cylinder 16 arranged in respective leg. Each hydraulic cylinder communicates, through a line 17, with an associated chamber 5 in the hydrau-3 o lic pump 1, which pump can be arranged in a readily accessibleplace. By rotating the operating knob 11, the table top can be moved in a parallel pattern of movement vertically, i.e. it can both be raised and lowered, depending upon the direction in which the knob 11 is turned, An uneven load on the table top will not affect its setting in the horizontal plane.
The hydraulic pump illustrated in Figure 1 can be used, however, in many other ccnnections, where it is desired to dis-pense equal or given volumes to different lines. Thus, in this latter case the piston means 2 shall not have the same area, but
2~
their area can be ada~ted in dependence upon the quantities of oil which are required in respective lines. A common feature, however, is that the discharge quantities of oil can be establish-ed substantially precisely, since they are solely dependent upon S respec-tive piston surfaces.
The aforedescribed hydraulic ~ump can be modified in several respects within the scope of the accompanying claims.
Thus, the piston rod can be oPerated in a desired manner and, for example, may be motor driven. Further, any number of piston /~ means may be provided.
, ~ :
their area can be ada~ted in dependence upon the quantities of oil which are required in respective lines. A common feature, however, is that the discharge quantities of oil can be establish-ed substantially precisely, since they are solely dependent upon S respec-tive piston surfaces.
The aforedescribed hydraulic ~ump can be modified in several respects within the scope of the accompanying claims.
Thus, the piston rod can be oPerated in a desired manner and, for example, may be motor driven. Further, any number of piston /~ means may be provided.
, ~ :
Claims (4)
1. A height adjustable table for use as a data terminal or the like, comprising a plurality of supporting legs and a table top, a plurality of height adjusting hydraulic cylinders, one said cylinder being provided in each said leg, and means for simultaneously supplying to the various cylinders quantities of hydraulic medium corresponding to the desired setting of said table, said hydraulic cylinders each communicating with a respective displacement chamber of a single hydraulic pump located on said table top, said pump being common to all said hydraulic cylinders and comprising a pump cylinder and a piston rod axially displaceable therein, wherein the piston rod is stepped to form a plurality of annular, concentrical piston surfaces and the inner diameter of the pump cylinder is stepped in a corresponding manner to the piston rod, such that there is formed in front of each piston surface a displacement chamber, said chambers being simultaneously mutually sealed at the beginning of a working stroke of the pump, and being maintained in mutually sealed relationship during said working stroke, whereby equal quantities of hydraulic medium are supplied to each said hydraulic cylinder, thereby maintaining the table level regardless of any unevenness of load thereon.
2. A table according to claim 1, wherein all the piston surfaces have the same area.
3. A table acording to claim 1, wherein a sealing element surrounds the piston rod behind each step and the inner surface of the cylinder is provided with means leaking hydraulic medium between adjacent chambers when the piston rod is pulled back.
4. A table according to claim 1, wherein the movement of the piston rod is controlled by means of a rotatable screw in thread engagement with the piston rod.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7804408-8 | 1978-04-18 | ||
| SE7804408A SE408218B (en) | 1978-04-18 | 1978-04-18 | HYDRAL CYLINDER WITH PISTON FOR SAME SUPPLY OF THE SAME QUANTITY OF HYDRAULIC MEDIUM TO EACH AND ONE OF ANY NUMBER OF HYDRAULIC CYLINDERS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141626A true CA1141626A (en) | 1983-02-22 |
Family
ID=20334658
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000325193A Expired CA1141626A (en) | 1978-04-18 | 1979-04-09 | Apparatus for setting the position of a device provided with a plurality of adjusting hydraulic cylinders |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JPS54145885A (en) |
| CA (1) | CA1141626A (en) |
| CH (1) | CH640034A5 (en) |
| DE (1) | DE2914896A1 (en) |
| DK (1) | DK159679A (en) |
| FI (1) | FI791170A (en) |
| FR (1) | FR2423661A1 (en) |
| GB (1) | GB2018905B (en) |
| NL (1) | NL7903003A (en) |
| NO (1) | NO151980C (en) |
| SE (1) | SE408218B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3738741A1 (en) * | 1987-11-14 | 1989-05-24 | Teves Gmbh Alfred | MASTER CYLINDER |
| JPH1120438A (en) * | 1997-07-04 | 1999-01-26 | Toyota Autom Loom Works Ltd | Damper fitting structure |
| CN102588363B (en) * | 2012-02-23 | 2015-01-28 | 中冶南方工程技术有限公司 | Method and device for synchronizing crystallizer vibration hydraulic cylinders |
-
1978
- 1978-04-18 SE SE7804408A patent/SE408218B/en unknown
-
1979
- 1979-04-09 NO NO791181A patent/NO151980C/en unknown
- 1979-04-09 CA CA000325193A patent/CA1141626A/en not_active Expired
- 1979-04-10 FI FI791170A patent/FI791170A/en not_active Application Discontinuation
- 1979-04-12 DE DE19792914896 patent/DE2914896A1/en not_active Withdrawn
- 1979-04-16 JP JP4550679A patent/JPS54145885A/en active Pending
- 1979-04-17 GB GB7913342A patent/GB2018905B/en not_active Expired
- 1979-04-17 NL NL7903003A patent/NL7903003A/en not_active Application Discontinuation
- 1979-04-17 FR FR7909612A patent/FR2423661A1/en active Pending
- 1979-04-18 DK DK159679A patent/DK159679A/en not_active IP Right Cessation
- 1979-04-18 CH CH364579A patent/CH640034A5/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| SE408218B (en) | 1979-05-21 |
| NO151980B (en) | 1985-04-01 |
| DK159679A (en) | 1979-10-19 |
| JPS54145885A (en) | 1979-11-14 |
| GB2018905B (en) | 1982-06-03 |
| NL7903003A (en) | 1979-10-22 |
| FR2423661A1 (en) | 1979-11-16 |
| NO151980C (en) | 1985-07-10 |
| NO791181L (en) | 1979-10-19 |
| DE2914896A1 (en) | 1979-10-31 |
| FI791170A (en) | 1979-10-19 |
| GB2018905A (en) | 1979-10-24 |
| CH640034A5 (en) | 1983-12-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |