Patent US4251056A successfully refreshed from Google Patents.
US4251056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Creep preventing safety device for hydraulic jacks, especially of the type employed for partially or one-side raising road vehicles
Assignee: Individual
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Filing: 1979-06-04
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Granted: 1981-02-17
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Expires: 1999-06-04
Abstract
Abstract A creep preventing safety device for hydraulic jacks, especially of the type employed for partially or one-side raising road vehicles, but not limited thereto, and comprising a bearing frame having journalled thereto the lifting arm of a force applying cup and its related parallel translation linkage, between opposite side plates of the frame there being accommodated the power applying hydraulic unit proper, along with the primary actuating lever and the foot lever for controlling the force applying cup, which hydraulic unit has its piston and piston rod operatively connected to said lifting arm; the creep preventing device being provided with a ratchet mechanism intervening between said power applying hydraulic unit and the lifting arm and including means for controllably releasing said ratchet mechanism.
Inventors
- 👤 Carmelo Maniglia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:15
CPC Classifications
B; B66; B66F; B66F17/00; B66F5/00; B66F5/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
249 words
A hydraulic lifting jack for vehicles, said jack comprising: (A) a frame, (B) a lifting arm (4), (C) means pivotally mounting said arm on the frame, (D) said arm being adapted to bear a load on its free end, (E) hydraulic means (14,16) for raising and lowering said lifting arm, and (F) a safety device comprising (i) a rack (60) on the lifting arm, (ii) a pawl-type supporting member (51), (iii) means pivotally mounting said member on the frame for pivotal movement to and from a supporting position in which the free end of said supporting member engages said rack in the raised position thereof and prevents lowering of the same, (iv) a spring (52) urging said supporting member into engagement with said rack, (v) a cable (54) for disengaging said supporting member from the rack against the action of said spring, (vi) an actuating lever (56) swingably mounted on said frame and connected to said cable to operate said cable for disengaging said supporting member from said rack, (vii) a locking lever (59) swingably mounted on said frame, (viii) said actuating lever cooperating with said locking lever to selectively bring said locking lever (a) from a position in which it permits said actuating lever to assume a position corresponding to engagement of said supporting member with said rack (b) to a position in which said locking lever locks said actuating lever in a position corresponding to disengagement of said supporting member from said rack of said lifting arm.
Claim 2
Dependent Claim
249 words
A hydraulic lifting jack for vehicles, said jack comprising: (A) a frame, (B) a lifting arm (4), (C) means pivotally mounting said arm on the frame, (D) said arm being adapted to bear a load on its free end, (E) hydraulic means (14,16) for raising and lowering said lifting arm, and (F) a safety device comprising (i) a rack (60) on the lifting arm, (ii) a pawl-type supporting member (51), (iii) means pivotally mounting said member on the frame for pivotal movement to and from a supporting position in which the free end of said supporting member engages said rack in the raised position thereof and prevents lowering of the same, (iv) a spring (52) urging said supporting member into engagement with said rack, (v) a cable (54) for disengaging said supporting member from the rack against the action of said spring, (vi) an actuating lever (56) swingably mounted on said frame and connected to said cable to operate said cable for disengaging said supporting member from said rack, (vii) a locking lever (59) swingably mounted on said frame, (viii) said actuating lever cooperating with said locking lever to selectively bring said locking lever (a) from a position in which it permits said actuating lever to assume a position corresponding to engagement of said supporting member with said rack (b) to a position in which said locking lever locks said actuating lever in a position corresponding to disengagement of said supporting member from said rack of said lifting arm.
Claim 3
Dependent Claim
36 words
A hydraulic lifting jack according to claim 1 in which said rack provided on said lifting arm constitutes a plurality of small metallic bars parallel to one another and secured by welding to said lifting arm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |