GB749262A - Improvements in or relating to hydraulic jacks - Google Patents
Improvements in or relating to hydraulic jacksInfo
- Publication number
- GB749262A GB749262A GB1409553A GB1409553A GB749262A GB 749262 A GB749262 A GB 749262A GB 1409553 A GB1409553 A GB 1409553A GB 1409553 A GB1409553 A GB 1409553A GB 749262 A GB749262 A GB 749262A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- pressure
- jack
- spring
- claws
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
749,262. Hydraulic jacks. BRITISH MESSIER, Ltd. May 18, 1954 [May 19, 1953], No. 14095/53. Class 69 (2). A hydraulic jack is locked in its extended position by a crown of spring claws 26 which are attached to the jack cylinder 11 and are engageable in a recess in a locking collar 34 connected to a piston 19 and jack rod 20. A locking ring 40 is slidably mounted on the rod 20 and has a lost motion connection with a secondary piston 43 located within the jack rod. A spring 47 urges the locking ring to the right. Liquid is admitted at an inlet 24 to extend the jack and is also applied to the rear of piston 43 to move it to the right till it abuts a partition 41 in the jack rod. Towards the end of its stroke the claws 26 contact a chamfered edge of the lock collar and are contracted and slide within the collar, forcing the locking ring 40 back against the pressure of spring 47, until the heads of the claws engage in the recess. The locking-ring is then moved forwardly by the spring 47 so that it comes within the crown of claws and locks them in position. To unlock the jack, pressure is applied to an inlet 25, the liquid acting on the forward end of the piston 43 to force it back against a stop 50 and move the ring 40 clear of the crown of claws. In a modification an additional spring bears on the back of piston 43 and helps to maintain the parts locked when pressure is not applied at the inlet 24. Fig. 3 shows a differential-type jack in which pressure is permanently applied at inlet 25. The spring 47 bears at one end against a sleeve 52 secured to the jack rod 20, and the piston 43 works inside the sleeve. The piston 43 has an extension 53 extending into a portion 54 of the rod 20 and has a greater area exposed to pressure on its left hand side than on its right. When pressure is released at 24, the pressure permanently applied at 25, acting on a shoulder 55 between the extension 53 and piston 43, forces the locking-ring back against the pressure of the spring 47. Specification 527,225 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1409553A GB749262A (en) | 1953-05-19 | 1953-05-19 | Improvements in or relating to hydraulic jacks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1409553A GB749262A (en) | 1953-05-19 | 1953-05-19 | Improvements in or relating to hydraulic jacks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB749262A true GB749262A (en) | 1956-05-23 |
Family
ID=10034892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1409553A Expired GB749262A (en) | 1953-05-19 | 1953-05-19 | Improvements in or relating to hydraulic jacks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB749262A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2286227A (en) * | 1994-01-18 | 1995-08-09 | Dowty Aerospace Gloucester | Actuator |
| CN114180034A (en) * | 2021-12-17 | 2022-03-15 | 江西洪都航空工业集团有限责任公司 | Sleeve type stay bar with spiral inner lock |
-
1953
- 1953-05-19 GB GB1409553A patent/GB749262A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2286227A (en) * | 1994-01-18 | 1995-08-09 | Dowty Aerospace Gloucester | Actuator |
| GB2286227B (en) * | 1994-01-18 | 1997-05-28 | Dowty Aerospace Gloucester | Actuator |
| CN114180034A (en) * | 2021-12-17 | 2022-03-15 | 江西洪都航空工业集团有限责任公司 | Sleeve type stay bar with spiral inner lock |
| CN114180034B (en) * | 2021-12-17 | 2023-08-25 | 江西洪都航空工业集团有限责任公司 | Sleeve type stay bar with spiral inner lock |
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