CA2359770A1 - Air lifting and balancing unit - Google Patents
Air lifting and balancing unit Download PDFInfo
- Publication number
- CA2359770A1 CA2359770A1 CA002359770A CA2359770A CA2359770A1 CA 2359770 A1 CA2359770 A1 CA 2359770A1 CA 002359770 A CA002359770 A CA 002359770A CA 2359770 A CA2359770 A CA 2359770A CA 2359770 A1 CA2359770 A1 CA 2359770A1
- Authority
- CA
- Canada
- Prior art keywords
- drum
- piston
- chain
- cylinder
- air pressure
- 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.)
- Granted
Links
- 230000001133 acceleration Effects 0.000 abstract 1
Landscapes
- Actuator (AREA)
- Transmission Devices (AREA)
Abstract
An air lifting and balancing unit (10, 80) including a cylinder (12, 82), a piston (21, 107) in the cylinder (12, 82), a ball screw (24, 90) affixed to the piston (21, 107), a ball nut (42, 97) mounted for rotation on the ball screw (24, 90), a drum 45, 102) mounted on the ball nut, a chain (52, 114) driven by the drum (45, 102), and centrifugally actuated brakes (62, 117) mounted on the drum (45, 102) for stopping rotation of the drum when the drum (45, 102) exceeds a predetermined acceleration either due to a loss of load or to a loss of air pressure applied to the piston (21, 107), and a pneumatic circuit (140) in communication with the cylinder (12, 82) for providing air pressure thereto which applies a force on the piston (21, 107) which is at a substantially constant incremental value in opposition to the force exerted by the load (69) applied to the piston (21, 107) through the chain (52, 114) and the drum (45, 102) and the ball screw (24, 90) regardless of variations in said air pressure to thereby cause the speed of the chain (52, 114) to remain substantially constant.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/165,701 US5439200A (en) | 1993-12-10 | 1993-12-10 | Air lifting and balancing unit |
US08/165,701 | 1993-12-10 | ||
CA002176026A CA2176026C (en) | 1993-12-10 | 1994-12-08 | Air lifting and balancing unit |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002176026A Division CA2176026C (en) | 1993-12-10 | 1994-12-08 | Air lifting and balancing unit |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2359770A1 true CA2359770A1 (en) | 1995-06-15 |
CA2359770C CA2359770C (en) | 2002-08-20 |
Family
ID=25678456
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002359770A Expired - Fee Related CA2359770C (en) | 1993-12-10 | 1994-12-08 | Air lifting and balancing unit |
CA002359774A Expired - Fee Related CA2359774C (en) | 1993-12-10 | 1994-12-08 | Air lifting and balancing unit |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002359774A Expired - Fee Related CA2359774C (en) | 1993-12-10 | 1994-12-08 | Air lifting and balancing unit |
Country Status (1)
Country | Link |
---|---|
CA (2) | CA2359770C (en) |
-
1994
- 1994-12-08 CA CA002359770A patent/CA2359770C/en not_active Expired - Fee Related
- 1994-12-08 CA CA002359774A patent/CA2359774C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2359774A1 (en) | 1995-06-15 |
CA2359770C (en) | 2002-08-20 |
CA2359774C (en) | 2003-07-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |
Effective date: 20121210 |