CA2007438A1 - Hydraulic Platform Lift for Truck Trailers - Google Patents
Hydraulic Platform Lift for Truck TrailersInfo
- Publication number
- CA2007438A1 CA2007438A1 CA 2007438 CA2007438A CA2007438A1 CA 2007438 A1 CA2007438 A1 CA 2007438A1 CA 2007438 CA2007438 CA 2007438 CA 2007438 A CA2007438 A CA 2007438A CA 2007438 A1 CA2007438 A1 CA 2007438A1
- Authority
- CA
- Canada
- Prior art keywords
- cylinder
- rod end
- cylinders
- hydraulic fluid
- platform
- 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
Landscapes
- Forklifts And Lifting Vehicles (AREA)
- Vehicle Body Suspensions (AREA)
- Actuator (AREA)
Abstract
A hydraulic platform lift for use on trucks and truck trailers has two hydraulic cylinders, one on each side of a door. The cylinders are phasing cylinders in that one cylinder is larger than the other cylinder by a specific ratio. The cross-sectional area of the fluid in the rod end of the larger cylinder minus the area of the rod is equal to the cross-sectional area of the smaller cylinder. A
connecting line interconnects the rod end of the large cylinder with the cap end of the small cylinder.
Hydraulic fluid can be directed by control means into the cap end of the large cylinder or the rod end of the small cylinder. For upward movement, hydraulic fluid is forced into the rod end of the small cylinder. This in turn forces hydraulic fluid through the connecting line into the rod end of the large cylinder, thereby raising both pistons. For downward movement, hydraulic fluid is forced into the cap end of the large cylinder, thereby forcing fluid out of the rod end of the large cylinder and into the cap end of the small cylinder. This causes both cylinders to move downward. The platform lift also has a self-levelling feature whereby the pistons can be made level with one another by moving the platform into an uppermost position. The operational mechanism is located entirely at the sides of the trailer. The lift platform can be made to exert a positive upward force or a positive downward force during use.
connecting line interconnects the rod end of the large cylinder with the cap end of the small cylinder.
Hydraulic fluid can be directed by control means into the cap end of the large cylinder or the rod end of the small cylinder. For upward movement, hydraulic fluid is forced into the rod end of the small cylinder. This in turn forces hydraulic fluid through the connecting line into the rod end of the large cylinder, thereby raising both pistons. For downward movement, hydraulic fluid is forced into the cap end of the large cylinder, thereby forcing fluid out of the rod end of the large cylinder and into the cap end of the small cylinder. This causes both cylinders to move downward. The platform lift also has a self-levelling feature whereby the pistons can be made level with one another by moving the platform into an uppermost position. The operational mechanism is located entirely at the sides of the trailer. The lift platform can be made to exert a positive upward force or a positive downward force during use.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US29793089A | 1989-01-17 | 1989-01-17 | |
| US07/297,930 | 1989-01-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2007438A1 true CA2007438A1 (en) | 1990-07-17 |
| CA2007438C CA2007438C (en) | 1995-09-19 |
Family
ID=23148310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2007438 Expired - Fee Related CA2007438C (en) | 1989-01-17 | 1990-01-09 | Hydraulic platform lift for truck trailers |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2007438C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7299897B2 (en) | 2001-04-27 | 2007-11-27 | Saf-Holland Equipment Limited | Hydraulic platform lift incorporating positive displacement valve, and positive displacement valve for hydraulic platform lift |
-
1990
- 1990-01-09 CA CA 2007438 patent/CA2007438C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7299897B2 (en) | 2001-04-27 | 2007-11-27 | Saf-Holland Equipment Limited | Hydraulic platform lift incorporating positive displacement valve, and positive displacement valve for hydraulic platform lift |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2007438C (en) | 1995-09-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |