EP0295066A1 - Vehicle jacks - Google Patents
Vehicle jacks Download PDFInfo
- Publication number
- EP0295066A1 EP0295066A1 EP88305200A EP88305200A EP0295066A1 EP 0295066 A1 EP0295066 A1 EP 0295066A1 EP 88305200 A EP88305200 A EP 88305200A EP 88305200 A EP88305200 A EP 88305200A EP 0295066 A1 EP0295066 A1 EP 0295066A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- jack
- actuator
- members
- arms
- pivot point
- 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
Images
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
Definitions
- the present invention relates to vehicle jacks.
- Some vehicles for instance forklift trucks, carry a protective skirt around their base to act as a safety guard by preventing articles passing under the truck.
- the ground clearance of the skirt may be as little as two inches (five centimetres).
- Prior proposals addressing this problem have been found unsatisfactory and mechanically unreliable.
- a vehicle jack according to the present invention is characterised by comprising two elongate members pivotally connected to each other at an intermediate point along their lengths, and a fluid operated actuator attached between the ends of the two members to one side of the pivot point, the actuator being operable to cause the members to pivot with respect to one another to cause the distal ends of the members to move apart.
- the actuator is releasably attached.
- the actuator may be so adapted as to be used as a vehicle jack after being released from the members.
- the actuator may be a bottle jack.
- one of the members is cranked at the pivot point to extend above the other member between the pivot point and the point of attachment to the actuator.
- the distal end of the said one member bears on the ground when the jack is raised.
- one of the members comprises two arms extending between the pivot point and the distal end and connected at the distal end, the portion of the other member between the pivot point and the distal end nesting between the arms when the jack is fully lowered.
- the vehicle jack 10 comprises two elongate members or arms 12 and 14 pivotally connected to each other at 16.
- the pivot point is at an intermediate point along the lengths of both arms 12, 14.
- a fluid operated actuator 18 is releasably attached to the ends of the two members 12,14 to one side of the pivot point 16.
- the actuator 18 is operable to cause the members 12,14 to pivot with respect to one another to cause the distal ends 14A,20B to move apart.
- the arm 12 is formed from two component arms 12A,12B connected at the distal end by a foot plate 22.
- the foot plate and the ends of the arms 12A,12B are rounded to allow the foot plate to rock on the ground when the jack is in use, as will be described.
- the arms 12A,12B form between them a space 26 in which the arm 14 may nest between the pivot point 16 and its distal end 14A.
- a plate 28 is carried at the distal end 14A of the arm 14. The upper surface of the plate 28 is corrugated to allow it to engage securely an article to be lifted.
- the arm 14 is elongate, and generally straight, and carries ground wheels 24 at the opposite end to the plate 28.
- the arm 12 is cranked at the pivot point 16. When the arm 14 is nested in the arm 12, the cranked portion of the arm 12 projects upwardly above the arm 14.
- the actuator 18 is connected between the uppermost end of the arm 12 and the end of the arm 14, near the wheels 24.
- the actuator 18 is a standard bottle jack of the type which can be used as a vehicle jack in its own right.
- the bottle jack actuator 18 simply comprises a hydraulic cylinder and piston, a small hand operated pump for charging the cylinder, and a release valve allowing pressure within the cylinder to be vented.
- the actuator 18 is pivotally connected to the ends of the arms 12,14.
- the distal ends of the arms 12,14 are slid under the article to be lifted, until the plate 28 is located under a suitable part of the article, and the foot plate 22 is on firm ground. It will be understood that the nesting of the arms reduces the height of the jack when collapsed, and so allows the jack to be used in situations where little clearance is available, such as when lifting forklift trucks.
- the actuator 18 is pumped to extend and force apart the ends of the arms. As this happens, the arms pivot at the pivot point 16 and the distal ends of the arms move apart.
- the foot plate 22 rocks on the ground but does not move significantly across the ground.
- the plate 28 moves up to engage and lift the article. As the scissor-like action continues, the wheels 24 roll across the ground towards the foot plate 22.
- the actuator is pumped until the article has been lifted to the desired height.
- the release valve on the actuator 18 is opened to allow pressure slowly to vent from the cylinder, thereby allowing the plate 28 to descend until the arms are once again nested and the jack can be rolled out from underneath the article.
- the jack described above is of extremely simple construction and is therefore expected to be reliable. It is envisaged that the most likely cause of failure will be a failure in the bottle jack 18, but the releasable attachments of the bottle jack 18 allow it to be removed and replaced quickly and easily, if necessary.
- the device described also has the advantage that the bottle jack may be removed and used alone in appropriate circumstances, so that the arms may be thought of as an adapter to allow a bottle jack to be used in situations with limited clearance, where bottle jacks could not normally be used.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Vehicle Cleaning, Maintenance, Repair, Refitting, And Outriggers (AREA)
- Bridges Or Land Bridges (AREA)
- Vehicle Waterproofing, Decoration, And Sanitation Devices (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)
- Auxiliary Devices For Music (AREA)
- Magnetic Heads (AREA)
Abstract
Description
- The present invention relates to vehicle jacks.
- Some vehicles, for instance forklift trucks, carry a protective skirt around their base to act as a safety guard by preventing articles passing under the truck. The ground clearance of the skirt may be as little as two inches (five centimetres). In order that maintenance on forklift trucks may be carried out without removing the safety skirt, it is desirable to provide a vehicle jack which can reach under the truck through this limited space. Prior proposals addressing this problem have been found unsatisfactory and mechanically unreliable.
- A vehicle jack according to the present invention is characterised by comprising two elongate members pivotally connected to each other at an intermediate point along their lengths, and a fluid operated actuator attached between the ends of the two members to one side of the pivot point, the actuator being operable to cause the members to pivot with respect to one another to cause the distal ends of the members to move apart.
- Preferably the actuator is releasably attached. The actuator may be so adapted as to be used as a vehicle jack after being released from the members. The actuator may be a bottle jack.
- Preferably one of the members is cranked at the pivot point to extend above the other member between the pivot point and the point of attachment to the actuator. Preferably the distal end of the said one member bears on the ground when the jack is raised.
- Preferably one of the members comprises two arms extending between the pivot point and the distal end and connected at the distal end, the portion of the other member between the pivot point and the distal end nesting between the arms when the jack is fully lowered.
- One embodiment of the present invention will now be described by way of example only and with reference to the accompanying drawings in which :
- Fig. 1 is an elevation of a jack embodying the present invention; and
- Fig. 2 is a plan view of the jack of Fig. 1.
- The
vehicle jack 10 comprises two elongate members orarms arms actuator 18 is releasably attached to the ends of the twomembers pivot point 16. Theactuator 18 is operable to cause themembers distal ends - The
arm 12 is formed from twocomponent arms foot plate 22. The foot plate and the ends of thearms - The
arms space 26 in which thearm 14 may nest between thepivot point 16 and itsdistal end 14A. Aplate 28 is carried at thedistal end 14A of thearm 14. The upper surface of theplate 28 is corrugated to allow it to engage securely an article to be lifted. - The
arm 14 is elongate, and generally straight, and carriesground wheels 24 at the opposite end to theplate 28. - The
arm 12 is cranked at thepivot point 16. When thearm 14 is nested in thearm 12, the cranked portion of thearm 12 projects upwardly above thearm 14. Theactuator 18 is connected between the uppermost end of thearm 12 and the end of thearm 14, near thewheels 24. - The
actuator 18 is a standard bottle jack of the type which can be used as a vehicle jack in its own right. Thebottle jack actuator 18 simply comprises a hydraulic cylinder and piston, a small hand operated pump for charging the cylinder, and a release valve allowing pressure within the cylinder to be vented. Theactuator 18 is pivotally connected to the ends of thearms - To use the jack described above, the distal ends of the
arms plate 28 is located under a suitable part of the article, and thefoot plate 22 is on firm ground. It will be understood that the nesting of the arms reduces the height of the jack when collapsed, and so allows the jack to be used in situations where little clearance is available, such as when lifting forklift trucks. - Once the jack is in position, the
actuator 18 is pumped to extend and force apart the ends of the arms. As this happens, the arms pivot at thepivot point 16 and the distal ends of the arms move apart. Thefoot plate 22 rocks on the ground but does not move significantly across the ground. Theplate 28 moves up to engage and lift the article. As the scissor-like action continues, thewheels 24 roll across the ground towards thefoot plate 22. The actuator is pumped until the article has been lifted to the desired height. - When it is desired to lower the article, the release valve on the
actuator 18 is opened to allow pressure slowly to vent from the cylinder, thereby allowing theplate 28 to descend until the arms are once again nested and the jack can be rolled out from underneath the article. - The jack described above is of extremely simple construction and is therefore expected to be reliable. It is envisaged that the most likely cause of failure will be a failure in the
bottle jack 18, but the releasable attachments of thebottle jack 18 allow it to be removed and replaced quickly and easily, if necessary. The device described also has the advantage that the bottle jack may be removed and used alone in appropriate circumstances, so that the arms may be thought of as an adapter to allow a bottle jack to be used in situations with limited clearance, where bottle jacks could not normally be used. - Variations and modifications to the apparatus described above can be made without departing from the spirit of the present invention. Other types of actuator can be used, but are preferably removable for reasons explained above.
Claims (7)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88305200T ATE68773T1 (en) | 1987-06-09 | 1988-06-08 | JACK. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB878713478A GB8713478D0 (en) | 1987-06-09 | 1987-06-09 | Vehicle jacks |
GB8713478 | 1987-06-09 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0295066A1 true EP0295066A1 (en) | 1988-12-14 |
EP0295066B1 EP0295066B1 (en) | 1991-10-23 |
Family
ID=10618625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88305200A Expired - Lifetime EP0295066B1 (en) | 1987-06-09 | 1988-06-08 | Vehicle jacks |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0295066B1 (en) |
AT (1) | ATE68773T1 (en) |
DE (1) | DE3865744D1 (en) |
ES (1) | ES2027381T3 (en) |
GB (1) | GB8713478D0 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1873473A (en) * | 1930-12-20 | 1932-08-23 | Blackhawk Mfg Company | Hydraulic jack |
GB1248261A (en) * | 1968-12-31 | 1971-09-29 | John Cuthbert Bowker | Improvements relating to jacking apparatus |
GB2164630A (en) * | 1984-09-24 | 1986-03-26 | Wang Ta Chin | Wheeled hydraulic jack |
-
1987
- 1987-06-09 GB GB878713478A patent/GB8713478D0/en active Pending
-
1988
- 1988-06-08 AT AT88305200T patent/ATE68773T1/en not_active IP Right Cessation
- 1988-06-08 DE DE8888305200T patent/DE3865744D1/en not_active Expired - Lifetime
- 1988-06-08 EP EP88305200A patent/EP0295066B1/en not_active Expired - Lifetime
- 1988-06-08 ES ES198888305200T patent/ES2027381T3/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1873473A (en) * | 1930-12-20 | 1932-08-23 | Blackhawk Mfg Company | Hydraulic jack |
GB1248261A (en) * | 1968-12-31 | 1971-09-29 | John Cuthbert Bowker | Improvements relating to jacking apparatus |
GB2164630A (en) * | 1984-09-24 | 1986-03-26 | Wang Ta Chin | Wheeled hydraulic jack |
Non-Patent Citations (1)
Title |
---|
MATERIALS HANDLING NEWS, no. 279, Februry 1981. page 18, Dunstable, Bedfordshire, GB; "Two-speed forklift truck jack" * |
Also Published As
Publication number | Publication date |
---|---|
ATE68773T1 (en) | 1991-11-15 |
DE3865744D1 (en) | 1991-11-28 |
GB8713478D0 (en) | 1987-07-15 |
ES2027381T3 (en) | 1992-06-01 |
EP0295066B1 (en) | 1991-10-23 |
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