Claims
- 1. A composite hydraulic cylinder apparatus comprising a pneumatic cylinder mechanism and a braking oil hydraulic cylinder mechanism associated concentrically with the pneumatic cylinder mechanism, wherein sections of a front chamber and a rear chamber of the braking oil hydraulic cylinder mechanism overlap concentrically so as to equalize the volume changes of the chambers, said chambers being communicated through an oil passage with a control valve provided therein to control the flow of the oil.
- 2. The composite hydraulic cylinder apparatus according to claim 1, wherein said pneumatic cylinder mechanism is of a single-acting type.
- 3. The composite hydraulic cylinder apparatus according to claim 1, wherein said pneumatic cylinder mechanism is of a double-acting type.
- 4. The composite hydraulic cylinder apparatus according to claim 1, wherein said pneumatic cylinder mechanism is of a no-load type.
- 5. The composite hydraulic cylinder apparatus according to claim 1, wherein said control valve has at least one of a throttle valve and a stop valve.
- 6. The composite hydraulic cylinder apparatus according to claim 1, wherein an oil chamber is provided in the oil passage.
- 7. The composite hydraulic cylinder apparatus according to claim 1, wherein an outer cylinder wall portion of said braking oil hydraulic cylinder mechanism is of a dual wall construction and an inner space of said dual wall construction forms a part of the oil passage to communicate the front chamber with the rear chamber of said braking oil hydraulic cylinder mechanism.
- 8. The composite hydraulic cylinder apparatus according to claim 1, wherein an oil chamber is provided in the piston of the oil hydraulic system.
Priority Claims (1)
Number |
Date |
Country |
Kind |
61-100600 |
Apr 1986 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/041,970, filed Apr. 24, 1987, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2053819 |
Jul 1971 |
DEX |
2607157 |
Aug 1977 |
DEX |
3017403 |
Nov 1981 |
DEX |
1646 |
Mar 1966 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
41971 |
Apr 1987 |
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