WO2009005361A1 - Lock for axial locking of a piston rod coupling of a hydraulic ram to the body of the hydraulic ram - Google Patents
Lock for axial locking of a piston rod coupling of a hydraulic ram to the body of the hydraulic ram Download PDFInfo
- Publication number
- WO2009005361A1 WO2009005361A1 PCT/NO2008/000227 NO2008000227W WO2009005361A1 WO 2009005361 A1 WO2009005361 A1 WO 2009005361A1 NO 2008000227 W NO2008000227 W NO 2008000227W WO 2009005361 A1 WO2009005361 A1 WO 2009005361A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lock
- locking
- retainer
- hydraulic ram
- piston rod
- Prior art date
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
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/26—Locking mechanisms
- F15B15/261—Locking mechanisms using positive interengagement, e.g. balls and grooves, for locking in the end positions
Definitions
- This invention relates to a lock for the axial locking of the piston rod coupling of a hydraulic ram to the body of the hydraulic ram. More particularly, it relates to a lock for the axial locking of at least the piston rod or the piston rod coupling of a hydraulic ram to the body of the hydraulic ram, the lock being arranged externally to the body, the lock including a locking body which is movable between an active position, in which the locking body engages a locking portion, and a passive position, in which the locking body is disengaged from the locking portion.
- movable is meant in this connection both axially movable and rotatable.
- the mechanical locking of the piston rod coupling of a hydraulic ram to the body of the hydraulic ram is necessary in some cases when maintenance is to be carried out or when it is necessary for the piston rod coupling to be in a fixed position relative to the body.
- the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
- a lock according to the invention for the axial locking of at least the piston rod or piston rod coupling of a hydraulic ram to the body of the hydraulic ram, the lock being arranged externally to the body, is characterized by the lock being connected to the body and the piston rod coupling being provided with a locking portion, the lock including a locking body which is movable between an active position, in which the locking body engages the locking portion, and a passive position, in which the locking body is disengaged from the locking portion.
- a retainer is movable between an active position, in which the retainer prevents the locking body from being moved away from its locking position, and a passive position, in which the retainer does not prevent the locking body from being moved away from its locking position.
- the locking body is movably connected to the retainer, a movement of the retainer from its passive position towards its active position causing the locking body to be moved from its passive position into its active position, after which a further movement of the retainer carries the retainer into its active position.
- a movement of the retainer from its active position towards its passive position will have the effect of carrying the retainer away from its active position, after which a further movement of the retainer in the same direction causes the locking body to be moved from its active position into its passive position.
- the locking body which is in the lock housing of the lock bears on a shoulder in the lock housing. Tensile forces from the piston rod coupling, which can be formed in one piece of material with the piston rod, is thereby transmitted via the locking portion, the retainer and the lock housing to the body.
- the lock typically includes a latch guide which is connected to the retainer, a latch body, connected to the locking body, extending in an elongated latching groove in the latch guide, at least part of the groove being formed by a portion which is oblique relative to the moving direction of the retainer.
- the latch body rests against the oblique portion when the locking body is in its passive position.
- the abutment of the latch body against the groove prevents the retainer from being moved away from its passive position without the locking body being moved in the direction of its active position.
- the latch body is arranged to be visible, preferably on the outside of the lock, to enable visual checking of the positions of the locking body and retainer.
- a lock according to the invention is well suited for use on hydraulic rams of a considerable size, the forces that arise being safely transmitted via the locking body and lock housing to the body.
- the lock according to the invention can easily be formed in such a way that the relative positions of the locking body and retainer can be established visually.
- Figure 1 shows in perspective an axial section of the lock according to the invention and also a section of an associated hydraulic ram, the piston rod coupling of the hydraulic ram being locked to the body of the hydraulic ram;
- Figure 2 shows a plan view of locking bodies
- Figure 3 shows a plan view of a retainer
- Figure 4 shows an axial section of a lock and a section of an associated hydraulic ram, the sections being changed somewhat, for reasons of illustration, in relation to the section of figure 1, and the locking body of the lock being in its inactive position;
- Figure 5 shows the same as figure 4, but here the retainer of the lock has been moved a distance, whereby the locking body has been brought to engage the locking portion of the piston rod coupling;
- Figure 6 shows the same as figure 5, but here the retainer has been moved a further distance, whereby the retainer has been moved somewhat in between the locking body and the lock housing;
- Figure 7 shows the same as figure 6, but here the retainer has been moved into its active position.
- the reference numeral 1 indicates a lock which is connected to a hydraulic ram 2, the hydraulic ram 2 including a tubular portion 4 and an end cap 6, together forming a body 8.
- the hydraulic ram 2 further includes a piston rod 10 with a piston rod coupling 12 mounted thereon. Necessary components, such as hydraulic ram attachment, piston seals and liquid ports are not shown.
- the piston rod coupling 12 is connected to the piston rod 10 by means of a threaded connection 14, the locking portion 16 of the piston rod coupling 12 being tubular, surrounding the threaded connection 14.
- the locking portion 12 is provided with two surrounding locking grooves 18.
- the lock includes a lock housing 20 which is connected to the body 8 by means of bolts 22.
- the lock housing 20 is provided with a through central opening 24 complementarily matching the locking portion 16.
- a lock space 26 is formed by the opening 24 being reamed somewhat in the direction from the gable end 6 in to a shoulder 28.
- a locking body 30, see figure 2 is placed in the lock space 26, bearing on the shoulder 28.
- the locking body 30 surrounds, together with the other locking bodies 30, the locking portion 16 and is provided with beads 32 projecting radially inwards, complementarily matching the locking grooves 18.
- the diameter of the lock space 26 is chosen to be such that the locking bodies 30 can be moved into their passive positions within the lock space 26.
- Each of the locking bodies 30 is provided with a U-shaped latch body 34, see figure 2.
- the latch bodies 34 project radially from the locking body 30 to the outside of the lock housing 20 through bores, not shown, when the locking body 30 has been fitted in the lock 1.
- a sheave 36 is connected to the latch body 34.
- the internal surface of the retainer 38 is somewhat conical, fitting complementariIy round the outside of the locking bodies 30 when the locking bodies 30 are in their active positions.
- the retainer 38 is provided with four connection elements 40 projecting outwards, connecting the retainer to an actuating sleeve 42 surrounding the lock housing 20.
- the connection elements 40 extend through their respective elongated, radial cut-outs 44 in the lock housing 20.
- the connection elements 40 and their cut-outs 44 have been rotated 45 degrees about the longitudinal axis of the hydraulic ram 2 to illustrate better the operation of the lock 1.
- Each latch guide 46 is provided with a latching groove 48 which has been given, at one end portion thereof, an oblique portion 50 extending outwards.
- the latch bodies 34 extend through their respective latching grooves 48, the sheave 36 corresponding with a relatively small clearance to the latching groove 48.
- the sheave 36 is in the oblique portion 50 when the corresponding locking body is in its passive position, see figure 4.
- the locking bodies 30 are moved in the directions of their active positions, the sheave 36 rolling in the oblique portion 50 of the latching groove 48, while at the same time the retainer 38 is moved in the direction of the locking bodies 30, see figure 5.
- the opening of the lock 1 is carried out by moving the actuating sleeve 42 in the opposite direction until the sheave 36 is in the end position within the oblique portion 50, whereby it can be established that the locking bodies 30 are in their respective inactive positions.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Actuator (AREA)
Abstract
A lock (1) for the axial locking of the piston rod coupling (12) of a hydraulic ram (2) to the body (8) of the hydraulic ram (2), the lock (1) being connected to the body (8) and the piston rod coupling (12) being provided with a locking portion (16), the lock (1) including a locking body (30) which is movable between an active position, in which the locking body (30) engages the locking portion (16), and a passive position, in which the locking body (30) is disengaged from the locking portion (16).
Description
LOCK FOR AXIAL LOCKING OF A PISTON ROD COUPLING OF A HYDRAULIC RAM TO THE BODY OF THE HYDRAULIC RAM
This invention relates to a lock for the axial locking of the piston rod coupling of a hydraulic ram to the body of the hydraulic ram. More particularly, it relates to a lock for the axial locking of at least the piston rod or the piston rod coupling of a hydraulic ram to the body of the hydraulic ram, the lock being arranged externally to the body, the lock including a locking body which is movable between an active position, in which the locking body engages a locking portion, and a passive position, in which the locking body is disengaged from the locking portion.
By movable is meant in this connection both axially movable and rotatable.
The mechanical locking of the piston rod coupling of a hydraulic ram to the body of the hydraulic ram is necessary in some cases when maintenance is to be carried out or when it is necessary for the piston rod coupling to be in a fixed position relative to the body.
It has turned out to be difficult to construct a lock which can withstand forces in the order of several hundred tonnes without it exhibiting, at least over time, an unreliable function.
Furthermore, in some situations it is essential that it should be possible easily and preferably visually to establish whether the lock is in a secure locking position, which is possible only to a limited degree by means of prior art locks .
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
The object is achieved according to the invention through the features specified in the description below and in the claims that follow.
A lock according to the invention for the axial locking of at least the piston rod or piston rod coupling of a hydraulic ram to the body of the hydraulic ram, the lock being arranged externally to the body, is characterized by the lock being connected to the body and the piston rod coupling being provided with a locking portion, the lock including a locking body which is movable between an active position, in which the locking body engages the locking portion, and a passive position, in which the locking body is disengaged from the locking portion.
A retainer is movable between an active position, in which the retainer prevents the locking body from being moved away from its locking position, and a passive position, in which the retainer does not prevent the locking body from being moved away from its locking position.
The locking body is movably connected to the retainer, a movement of the retainer from its passive position towards its active position causing the locking body to be moved from its passive position into its active position, after which a further movement of the retainer carries the retainer into its active position.
Correspondingly, a movement of the retainer from its active position towards its passive position will have the effect of carrying the retainer away from its active position, after which a further movement of the retainer in the same direction causes the locking body to be moved from its active position into its passive position.
The locking body which is in the lock housing of the lock bears on a shoulder in the lock housing. Tensile forces from the piston rod coupling, which can be formed in one piece of material with the piston rod, is thereby transmitted via the locking portion, the retainer and the lock housing to the body.
The lock typically includes a latch guide which is connected to the retainer, a latch body, connected to the locking body, extending in an elongated latching groove in the latch guide, at least part of the groove being formed by a portion which is oblique relative to the moving direction of the retainer.
The latch body rests against the oblique portion when the locking body is in its passive position. The abutment of the latch body against the groove prevents the retainer from being moved away from its passive position without the locking body being moved in the direction of its active position.
The latch body is arranged to be visible, preferably on the outside of the lock, to enable visual checking of the positions of the locking body and retainer.
A lock according to the invention is well suited for use on hydraulic rams of a considerable size, the forces that arise being safely transmitted via the locking body and lock housing to the body. The lock according to the invention can
easily be formed in such a way that the relative positions of the locking body and retainer can be established visually.
In what follows is described a non-limiting example of a preferred embodiment which is visualized in the accompanying drawings, in which:
Figure 1 shows in perspective an axial section of the lock according to the invention and also a section of an associated hydraulic ram, the piston rod coupling of the hydraulic ram being locked to the body of the hydraulic ram;
Figure 2 shows a plan view of locking bodies;
Figure 3 shows a plan view of a retainer;
Figure 4 shows an axial section of a lock and a section of an associated hydraulic ram, the sections being changed somewhat, for reasons of illustration, in relation to the section of figure 1, and the locking body of the lock being in its inactive position;
Figure 5 shows the same as figure 4, but here the retainer of the lock has been moved a distance, whereby the locking body has been brought to engage the locking portion of the piston rod coupling;
Figure 6 shows the same as figure 5, but here the retainer has been moved a further distance, whereby the retainer has been moved somewhat in between the locking body and the lock housing; and
Figure 7 shows the same as figure 6, but here the retainer has been moved into its active position.
In the drawings the reference numeral 1 indicates a lock which is connected to a hydraulic ram 2, the hydraulic ram 2 including a tubular portion 4 and an end cap 6, together forming a body 8. The hydraulic ram 2 further includes a piston rod 10 with a piston rod coupling 12 mounted thereon. Necessary components, such as hydraulic ram attachment, piston seals and liquid ports are not shown.
The piston rod coupling 12 is connected to the piston rod 10 by means of a threaded connection 14, the locking portion 16 of the piston rod coupling 12 being tubular, surrounding the threaded connection 14. The locking portion 12 is provided with two surrounding locking grooves 18.
The lock includes a lock housing 20 which is connected to the body 8 by means of bolts 22. The lock housing 20 is provided with a through central opening 24 complementarily matching the locking portion 16. A lock space 26 is formed by the opening 24 being reamed somewhat in the direction from the gable end 6 in to a shoulder 28.
A locking body 30, see figure 2, is placed in the lock space 26, bearing on the shoulder 28. The locking body 30 surrounds, together with the other locking bodies 30, the locking portion 16 and is provided with beads 32 projecting radially inwards, complementarily matching the locking grooves 18. The diameter of the lock space 26 is chosen to be such that the locking bodies 30 can be moved into their passive positions within the lock space 26.
Each of the locking bodies 30 is provided with a U-shaped latch body 34, see figure 2. The latch bodies 34 project radially from the locking body 30 to the outside of the lock housing 20 through bores, not shown, when the locking body 30 has been fitted in the lock 1. A sheave 36 is connected to
the latch body 34.
A retainer 38 in the form of a sleeve, see figure 3, is disposed in the lock space 26. The internal surface of the retainer 38 is somewhat conical, fitting complementariIy round the outside of the locking bodies 30 when the locking bodies 30 are in their active positions.
The retainer 38 is provided with four connection elements 40 projecting outwards, connecting the retainer to an actuating sleeve 42 surrounding the lock housing 20. The connection elements 40 extend through their respective elongated, radial cut-outs 44 in the lock housing 20. In figures 4-7 the connection elements 40 and their cut-outs 44 have been rotated 45 degrees about the longitudinal axis of the hydraulic ram 2 to illustrate better the operation of the lock 1.
Externally around the actuating sleeve 42 and fixed thereto, there is arranged, for each of the latch bodies 34, a latch guide 46. Each latch guide 46 is provided with a latching groove 48 which has been given, at one end portion thereof, an oblique portion 50 extending outwards.
The latch bodies 34 extend through their respective latching grooves 48, the sheave 36 corresponding with a relatively small clearance to the latching groove 48. The sheave 36 is in the oblique portion 50 when the corresponding locking body is in its passive position, see figure 4.
By moving the actuating sleeve 42 in the direction of the piston rod coupling 12 after the piston rod coupling 12 has been placed in a position correct for locking, the locking bodies 30 are moved in the directions of their active positions, the sheave 36 rolling in the oblique portion 50 of the latching groove 48, while at the same time the retainer
38 is moved in the direction of the locking bodies 30, see figure 5.
When the actuating sleeve 42 is moved further, the sheave 36 is in a portion of the latching groove 48 which is parallel to the moving direction of the retainer 38. The locking bodies 30 are thereby prevented from being moved out of their active positions. At the same time, the retainer 38 is moved in behind the locking bodies 30, see figures 6.
In figure 7 the actuating sleeve 42 is moved into its end position, in which the retainer 38 is in its active position. In this position the retainer 38 is arranged to take up relatively great radial forces from the locking bodies 30, whereby the locking bodies 30 are able to transmit axial forces to the shoulder 28 without the risk of being moved out of their engagement with the locking portion 16.
It can easily be established that the lock 1 is locked by observing the position of the sheave 36 in the latching groove 48.
The opening of the lock 1 is carried out by moving the actuating sleeve 42 in the opposite direction until the sheave 36 is in the end position within the oblique portion 50, whereby it can be established that the locking bodies 30 are in their respective inactive positions.
Claims
1. A lock (1) for the axial locking of at least the piston rod (10) or piston rod coupling (12) of a hydraulic ram (2) to the body (8) of the hydraulic ram (2), the lock (1) being arranged externally to the body, c h a r a c t e r i z e d i n that the lock (1) is connected to the body (8) and that the piston rod coupling (12) is provided with a locking portion (16) , the lock (1) including a locking body (30) which is movable between an active position, in which the locking body (30) engages the locking portion (16) , and a passive position, in which the locking body (30) is disengaged from the locking portion (16) .
2. The lock (1) in accordance with claim 1, c h a - r a c t e r i z e d i n that a retainer (38) is movable between an active position, in which the retainer (38) prevents the locking body (30) from being moved away from its locking position, and a passive position, in which the retainer (38) does not prevent the locking body (30) from being moved away from its locking position.
3. The lock (1) in accordance with claim 2, c ha r a c t e r i z e d i n that the locking body (30) is movably connected to the retainer (38) , a movement of the retainer (38) from its passive position towards its active position causing the locking body (30) to be moved from its passive position into its active position, after which a further movement of the retainer (38) carries the retainer into its active position.
4. The lock (1) in accordance with claim 2, c ha r a c t e r i z e d i n that the locking body (30) is movably connected to the retainer (38) , a movement of the retainer (38) from its active position towards its passive position causing the retainer (38) to be carried away from its active position, after which a further movement of the retainer (38) in the same direction causes the locking body (30) to be moved from its active position into its passive position.
5. The lock (1) in accordance with claim 2, c ha r a c t e r i z e d i n that the lock (1) includes a latch guide (46) which is connected to the retainer (38) , a latch body (34) connected to the locking body (30) extending in an elongated latching groove (48) in the latch guide (46) , and at least part of the latching groove (48) being formed by a portion (50) which is oblique relative to the moving direction of the retainer (38) .
6. The lock (1) in accordance with claim 5, c h a - r a c t e r i z e d i n that the latch body (34) bears against the oblique portion (50) of the latching groove (48) when the locking body (30) is in its passive position.
7. The lock (1) in accordance with claim 6, c h a - r a c t e r i z e d i n that the abutment of the latch body (34) against the latching groove (48) prevents the retainer (38) from being moved away from its passive position without the locking body (30) being moved in the direction of its active position.
8. The lock (1) in accordance with claim 1, c ha r a c t e r i z e d i n that the latch body (34) is arranged to be visible from the outside of the lock (D -
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20073412A NO329856B1 (en) | 2007-07-03 | 2007-07-03 | Load for axial loading of a piston rod coupling of a hydraulic cylinder to the cylinder housing of the hydraulic cylinder |
NO20073412 | 2007-07-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009005361A1 true WO2009005361A1 (en) | 2009-01-08 |
Family
ID=39745460
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO2008/000227 WO2009005361A1 (en) | 2007-07-03 | 2008-06-20 | Lock for axial locking of a piston rod coupling of a hydraulic ram to the body of the hydraulic ram |
Country Status (2)
Country | Link |
---|---|
NO (1) | NO329856B1 (en) |
WO (1) | WO2009005361A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2768610A (en) * | 1953-11-12 | 1956-10-30 | Mead Specialties Company Inc | Control mechanism for pressure fluid apparatus |
DE19521783A1 (en) * | 1994-07-13 | 1996-01-18 | Hoerbiger Ventilwerke Ag | Hydraulic working cylinder, e.g. for siding roof of motor vehicle |
EP1669612A2 (en) * | 2004-12-09 | 2006-06-14 | Bosch Rexroth Teknik AB | Linear cylinder unit with locking means |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3104593A (en) * | 1960-12-28 | 1963-09-24 | Regent Jack Mfg Co Inc | Fluid actuators |
US3196991A (en) * | 1962-05-04 | 1965-07-27 | Richard L Johnson | Mast |
JPS57127109A (en) * | 1981-01-30 | 1982-08-07 | Kyokuto Kaihatsu Kogyo Co Ltd | Hydraulic cylinder |
AUPQ786700A0 (en) * | 2000-05-31 | 2000-06-22 | Razorback Vehicles Corporation Limited | A hydraulic or pneumatic cylinder |
JP4185374B2 (en) * | 2003-01-29 | 2008-11-26 | 株式会社コガネイ | Fluid pressure cylinder |
-
2007
- 2007-07-03 NO NO20073412A patent/NO329856B1/en not_active IP Right Cessation
-
2008
- 2008-06-20 WO PCT/NO2008/000227 patent/WO2009005361A1/en active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2768610A (en) * | 1953-11-12 | 1956-10-30 | Mead Specialties Company Inc | Control mechanism for pressure fluid apparatus |
DE19521783A1 (en) * | 1994-07-13 | 1996-01-18 | Hoerbiger Ventilwerke Ag | Hydraulic working cylinder, e.g. for siding roof of motor vehicle |
EP1669612A2 (en) * | 2004-12-09 | 2006-06-14 | Bosch Rexroth Teknik AB | Linear cylinder unit with locking means |
Also Published As
Publication number | Publication date |
---|---|
NO329856B1 (en) | 2011-01-17 |
NO20073412L (en) | 2009-01-05 |
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