WO2002083545B1 - Portable lifting jack - Google Patents
Portable lifting jackInfo
- Publication number
- WO2002083545B1 WO2002083545B1 PCT/US2002/011114 US0211114W WO02083545B1 WO 2002083545 B1 WO2002083545 B1 WO 2002083545B1 US 0211114 W US0211114 W US 0211114W WO 02083545 B1 WO02083545 B1 WO 02083545B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- valve body
- hydraulic
- vent valve
- lifting mechanism
- vent
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F5/00—Mobile jacks of the garage type mounted on wheels or rollers
- B66F5/04—Mobile jacks of the garage type mounted on wheels or rollers with fluid-pressure-operated lifting gear
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Handcart (AREA)
- Fluid-Pressure Circuits (AREA)
- Forklifts And Lifting Vehicles (AREA)
Abstract
A portable lifting jack having a wheeled frame (1), a lifting arm (10), a handle (11) and a hydraulic pump (2), which includes a multipurpose block (20) formed as an octogonal column member, and a releasing device (40) and a piston pump (50) respectively defined in a rear side of the multipurpose block. A hydraulic actuator (60) is connected at a threaded hole defined in a front side of the multipurpose block. Two oil chambers (24) are defined in opposite ends of the multipurpose block and communicate with each other. Particularly, an equalizing valve (30) is disposed on a top of the multipurpose block and in communication with the oil chamber to equalize the external and internal pressures of the hydraulic pump so as to increase the efficiency of the hydraulic portable lifting jack.
Claims
AMENDED CLAIMS
[received by the International Bureau on 4 October 2002 (04.10.02); original claims 2-6, 10, 11, 16, 26, 27, 30-33, 35 and 36 amended, original claim 25 cancelled; new claims 37 and 38 added; remaining claims unchanged (11 pages)]
pressure on the first side of the vent valve body is higher than air pressure on the second side of the vent valve body, the vent valve body moves out of contact with the valve seat permitting air to flow between the vent valve body and the valve seat, the other of the venting mechanisms comprising: the vent valve body having a flexible flange at one end thereof, the flexible flange being in sealing contact with a valve seat within the valve body cavity, when air pressure on the second side of the vent valve body is higher than air pressure on the first side of the vent valve body, the flexible flange flexes out of contact with the valve seat permitting air to flow between the vent valve body and the valve seat; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
2. A hydraulic lifting mechanism comprising: a frame of horizontally spaced side plates; a plurality of wheels attached to the frame; a hydraulic power block attached to the frame, the hydraulic power block having an oil reservoir therein, and a removable vent plug in fluid communication with the oil reservoir, the removable vent plug having: a valve body having a cavity therein, an exterior vent hole in communication with the cavity, an interiorvent hole in communication with the cavity, and a vent valve body within the valve body cavity, wherein when air pressure is higher on one side of the vent valve body than on the other side of the vent valve body, the vent valve body allows air to flow from one side of the vent valve body to the other side of the vent valve body; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston,
3. The hydraulic lifting mechanism according to claim 2, wherein the removable vent plug further comprises; a valve seat within the valve body cavity; a spring biasing the vent valve body into contact with the valve seat, wherein, when air pressure on a first side of the vent valve body is higher than air pressure on a second side of the vent valve body, the vent valve body moves out of contact with the valve seat permitting air to flow between the vent valve body and the valve seat
4. The hydraulic lifting mechanism according to claim 3, wherein when the vent valve body has moved out of contact with the valve seat, the vent valve body and the valve body cavity form a labyrinth in a clearance between the vent valve body and the valve body cavity.
5. The hydraulic lifting mechanism according to claim 3, wherein the vent valve body has a flexible flange at one end thereof, the flexible flange being in sealing contact with the valve seat, and wherein when air pressure on the second side of the vent valve body is higher than air pressure on the first side of the vent valve body, the flexible flange flexes out of contact with the valve seat permitting air flow between the vent valve body and the valve seat.
6. The hydraulic lifting mechanism according to claim 2, wherein the vent valve body has a flexible flange at one end thereof, the flexible flange being in sealing contact with a valve seat within the valve body cavity, and wherein when air pressure on a second side of the vent valve body is higher than air pressure on a first side of the vent valve body, the flexible flange flexes out of contact with the valve seat permitting air flow between the vent valve body and the valve seat.
7. The hydraulic lifting mechanism according to claim 2, further compris-
iπg: a filter within a lower end of the valve body cavity.
8. The hydraulic lifting mechanism according to claim 2, wherein the vent valve body is formed from a flexible material.
9. The hydraulic lifting mechanism according to claim 2, wherein the vent plug has two venting mechanisms, one venting mechanism operating to allow air to flow from a first side of the vent valve body to a second side of the vent valve body when air pressure is higher on the first side of the vent valve body than on the second side of the vent valve body, the other mechanism operating to allow air to flow from the second side of the vent valve body to the first side of the vent valve body when air pressure is higher on the second side of the vent valve body than on the first side of the vent valve body.
10. The hydraulic lifting mechanism according to claim 9, wherein one of the venting mechanisms comprises: a spring biasing the vent valve body into contact with a valve seat within the valve body cavity, and wherein when air pressure on the first side of the vent valve body is higher than air pressure on the second side of the vent valve body, the vent valve body moves out of contact with the valve seat permitting air to flow between the vent valve body and the valve seat.
11. The hydraulic lifting mechanism according to claim 9, wherein one of the venting mechanisms comprises the vent valve body having a flexible flange at one end thereof, the flexible flange being in sealing contact with a valve seat within the valve body cavity, and wherein when air pressure on the second side of the vent valve body is higher than air pressure on the first side of the vent valve body, the flexible flange flexes out of contact with the valve seat permitting air to flow
between the vent
a plurality of wheels attached to the frame; a laterally extending hydraulic power block πon-rotatably attached to the frame, the hydraulic power block having an oil reservoir therein and a plurality of valve ports ail extending vertically downward from an upper surface thereof, the only valve ports being in the hydraulic block upper surface; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
17. The hydraulic lifting mechanism according to claim 16, wherein one valve port has an intake check valve therein and a discharge check valve therein; and another valve port has a pressure relief valve therein.
18. The hydraulic lifting mechanism according to claim 17, wherein each check valve and the relief valve comprise a valve seat in a valve port, a ball and a spring biasing the ball towards the valve seat.
19. The hydraulic lifting mechanism according to claim 18, wherein the intake check valve spring biases the intake check valve ball in the same direction that the discharge check valve spring biases the discharge check valve ball.
20. The hydraulic lifting mechanism according to claim 18, wherein each spring biases the associated ball in a vertically downward direction.
21. The hydraulic lifting mechanism according to claim 18, wherein the springs lie in a common vertical plane.
22. The hydraulic lifting mechanism according to claim 17, wherein the oil reservoir consists of two chambers connected by at least one conduit, the
intake check valve being in fluid communication with one chamber and the pressure relief valve being in fluid communication with the other chamber.
23. The hydraulic lifting mechanism according to claim 16, wherein the hydraulic power block has: a first valve port having a lower end thereof in fluid communication with the oil reservoir, a middle portion in fluid communication with a drive piston, an upper end in fluid communication with the hydraulic cylinder, an intake check valve between the lower end and the middle portion; and a discharge check valve between the middle portion and the upper end; and a second valve port having a lower end in fluid communication with the first valve port, an upper end in fluid communication with the oil reservoir; and a pressure relief valve between the lower end and the upper end.
24. The hydraulic lifting mechanism according to claim 16, wherein the hydraulic power block is monolithic.
26. A hydraulic lifting mechanism comprising; a frame of horizontally spaced side plates; a plurality of wheels attached to the frame; a monolithic hydraulic power block non-rotatably attached to the frame, the hydraulic power block having an oil reservoir therein and a plurality of valve ports all extending vertically downward from an upper surface thereof, the only valve ports being in the hydraulic block upper surface, one valve port having an intake check valve and a discharge check valve therein; and another valve port having a pressure relief valve therein; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
27. A hydraulic lifting mechanism comprising:
a frame of horizontally spaced side plates, each side plate having a plurality of first mounting holes therein; a plurality of wheels attached to the frame; a laterally extending non-rotatable hydraulic power block attached to the frame, the hydraulic power block having an oil reservoir therein and two pairs of second mounting holes therein, each pair of second mounting holes being oriented on a vertical line, each pair of second mounting holes being aligned with the first mounting holes on a side plate; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
28. The hydraulic lifting mechanism according to claim 27, wherein the hydraulic power block has a laterally extending octagonal shape.
29. The hydraulic lifting mechanism according to claim 27, wherein the hydraulic power block has a plurality of mounting flanges extending vertically from an upper surface and a lower surface, each mounting flange having one second mounting hole therein.
30. A hydraulic lifting mechanism comprising: a frame of horizontally spaced side plates, each side plate having a plurality of first mounting holes therein; a plurality of wheels attached to the frame; a monolithic hydraulic power block attached to the frame, the hydraulic power block having a laterally extending octagonal shape, an oil reservoir therein, a plurality of mounting flanges extending from an upper surface and a lower surface, and two sets of second mounting holes therein, each set of second mounting holes being oriented on a vertical line on opposing sides of the hydraulic power block, each set of second mounting holes being aligned
with the first mounting holes on a side plate, each mounting flange having one second mounting hole therein;
a hydraulic cylinder having an extensible piston, the hydraulic cylinder be¬ ing attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
31. A hydraulic lifting mechanism comprising: a frame of horizontally spaced side plates;
. a plurality of wheels attached to the frame; a laterally extending hydraulic power block attached to the frame, the hydraulic power block having an oil reservoir therein; at least one closed ended removable threaded end plug sealing an open end of the oil reservoir; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
32. The hydraulic lifting mechanism according to claim 31 , wherein the closed ended removable threaded end plug has a closed ended threaded aperture in an outer surface thereof.
33. The hydraulic lifting mechanism according to claim 31 , wherein the closed ended removable threaded end plug has a locating boss extending outward from an outer surface thereof.
34. The hydraulic lifting mechanism according to claim 33, wherein at least one side plate has a boss aperture therein, the locating boss engaging the boss aperture.
35. The hydraulic lifting mechanism according to claim 33, wherein the locating boss has a closed ended threaded aperture therein.
30
36. A hydraulic lifting mechanism comprising: a frame of horizontally spaced side plates, each side plate having a boss aperture therein; a plurality of wheels attached to the frame; a laterally extending non-rotatable hydraulic power block attached to the frame, the hydraulic power block having two open ended oil chambers therein; a closed ended removable threaded end plug seating each open ended oil chamber, the closed ended removable threaded end plug having a ocating boss extending outward from an outer surface thereof, each locating boss engaging a boss aperture; a hydraulic cylinder having an extensible piston, the hydraulic cylinder being attached to the hydraulic power block; and a lifting arm attached to the frame, the lifting arm being operatively connected to the extensible piston.
37. The hydraulic lifting mechanism according to claim 27, wherein the second mounting holes lie in a vertical plane longitudinally through the center of the hydraulic power block.
38. The hydraulic lifting mechanism according to claim 2, wherein the vent plug substantially prevents escape of oil during venting of air.
31
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/473,895 US7036796B2 (en) | 2001-04-13 | 2002-04-09 | Portable lifting jack |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW90205790 | 2001-04-13 | ||
| TW90205790U TW500123U (en) | 2001-04-13 | 2001-04-13 | Improved jack |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO2002083545A1 WO2002083545A1 (en) | 2002-10-24 |
| WO2002083545B1 true WO2002083545B1 (en) | 2002-12-05 |
| WO2002083545A8 WO2002083545A8 (en) | 2003-01-03 |
Family
ID=21682965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2002/011114 WO2002083545A1 (en) | 2001-04-13 | 2002-04-09 | Portable lifting jack |
Country Status (2)
| Country | Link |
|---|---|
| TW (1) | TW500123U (en) |
| WO (1) | WO2002083545A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20200011356A1 (en) * | 2018-07-09 | 2020-01-09 | Snap-On Incorporated | Hydraulic pump with secondary safety check valve |
| US11111119B2 (en) * | 2018-08-13 | 2021-09-07 | Snap-On Incorporated | Hydraulic power unit for jack with internally adjustable safety relief valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3844534A (en) * | 1973-06-04 | 1974-10-29 | Applied Power Inc | Lightweight hydraulic jack |
| US3907252A (en) * | 1974-04-29 | 1975-09-23 | Gray Mfg Co | Lightweight service jack |
| US4131263A (en) * | 1977-10-19 | 1978-12-26 | Norco Industries, Inc. | Fixed limit lifting jack |
-
2001
- 2001-04-13 TW TW90205790U patent/TW500123U/en not_active IP Right Cessation
-
2002
- 2002-04-09 WO PCT/US2002/011114 patent/WO2002083545A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002083545A1 (en) | 2002-10-24 |
| WO2002083545A8 (en) | 2003-01-03 |
| TW500123U (en) | 2002-08-21 |
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