GB815972A - Improvements in or relating to double-acting pneumatic jacks - Google Patents
Improvements in or relating to double-acting pneumatic jacksInfo
- Publication number
- GB815972A GB815972A GB33751/55A GB3375155A GB815972A GB 815972 A GB815972 A GB 815972A GB 33751/55 A GB33751/55 A GB 33751/55A GB 3375155 A GB3375155 A GB 3375155A GB 815972 A GB815972 A GB 815972A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chambers
- stroke
- piston
- effected
- duct
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
- F16J10/02—Cylinders designed to receive moving pistons or plungers
-
- 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
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
- F15B15/222—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke having a piston with a piston extension or piston recess which throttles the main fluid outlet as the piston approaches its end position
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Actuator (AREA)
Abstract
815,972. Pneumatic single-stroke apparatus. REGIE NATIONALE DES USINES RENAULT. Nov. 24, 1955 [April 28, 1955; May 13, 1955, Sept. 14, 1955], No. 33751/55. Class 8(2). A double-acting pneumatic jack comprises a piston 4, 5, Fig. 1, having extension sleeves 17, 18 adapted to enter chambers 25, 9 of reduced diameter at the ends of the cylinder 3 and said chambers are connected by ducts 26, 10 to a compressed air distributor 54, Fig. 7, which also connects through a duct 42 one or other of the chambers to an orifice 39 and a space 38 surrounding the piston rod 6 outbye a packing ring 35 therefor, whereby exhaust air is vented along the rod and through a filter 44 which not only retains dust but effects silencing. Needle valves 15, 31 restrict air exhausted near the end of a stroke from the main cylinder space and also from the cylinder space of reduced area. Alternatively restriction may be effected through the duct 42 by a valve 56 actuated by cams 59, 60 carried by a member 58 secured to the piston rod 6. In a further modification cushioning near the end of a stroke may be effected by lipped sealing rings 70, 71, Fig. 9, located in piston grooves 72, 73 allowing trapped air to gain access to an annular chamber 74 located between them. Specification 815, 971 [Group XXIX] is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR815972X | 1955-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB815972A true GB815972A (en) | 1959-07-08 |
Family
ID=9267563
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33751/55A Expired GB815972A (en) | 1955-04-28 | 1955-11-24 | Improvements in or relating to double-acting pneumatic jacks |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB815972A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108180184A (en) * | 2017-12-25 | 2018-06-19 | 重庆普永科技发展有限公司 | A kind of dust protected SMC cylinders |
CN111980993A (en) * | 2020-08-17 | 2020-11-24 | 刘凯强 | Excavator hydraulic cylinder protection device |
CN113389767A (en) * | 2021-07-23 | 2021-09-14 | 中国科学院合肥物质科学研究院 | Double-acting pneumatic actuator with long-stroke large-cylinder-diameter structure and control system thereof |
EP4226051A4 (en) * | 2020-10-08 | 2023-11-15 | Pimatic Oy | Arrangement in a pneumatic cylinder |
-
1955
- 1955-11-24 GB GB33751/55A patent/GB815972A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108180184A (en) * | 2017-12-25 | 2018-06-19 | 重庆普永科技发展有限公司 | A kind of dust protected SMC cylinders |
CN111980993A (en) * | 2020-08-17 | 2020-11-24 | 刘凯强 | Excavator hydraulic cylinder protection device |
EP4226051A4 (en) * | 2020-10-08 | 2023-11-15 | Pimatic Oy | Arrangement in a pneumatic cylinder |
CN113389767A (en) * | 2021-07-23 | 2021-09-14 | 中国科学院合肥物质科学研究院 | Double-acting pneumatic actuator with long-stroke large-cylinder-diameter structure and control system thereof |
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