US3632085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift-all jack
Assignee: Individual
•
Filing: 1969-12-19
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Granted: 1972-01-04
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Expires: 1989-12-19
Abstract
Abstract A lift-all jack having a generally horizontally disposed frame member with an anchor fixedly attached to one end of the frame and normally extending therefrom, an air cylinder fixedly disposed along the frame member having a stationary member horizontally attached to the frame and a reciprocating ram designed to be displaced away from the anchor member. A pair of generally parallel lifting bars pivotally connected at one end thereof to the reciprocating member and pivotally connected at the other end to a lifting cradle, a torque-holding arm pivotally connected to the lifting cradle at one end thereof and pivotally connected to the upper portion of the anchor at the other end thereof, whereby actuation of the power cylinder horizontally away from the anchor will induce a vertical movement of the lifting cradle and a load disposed thereupon. A method of lifting one end of a vehicle which will minimize lateral displacement during the operation including the steps of: pivotally holding a lifting cradle about a point remote from said cradle and at a height equal to or greater than the height desired of the lifting cradle.
Inventors
- 👤 George J Traywick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:14
CPC Classifications
B; B66; B66F; B66F5/00; B66F5/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
160 words
An air jack comprising: a frame member; an anchor fixedly attached to said frame member at one end thereof and generally normally extending with respect thereto; an air cylinder having a stationary member fixedly attached to said frame member, and a reciprocating member, designed for displacement away from said anchor when the jack is being raised and toward said anchor when the jack is being lowered; a lifting cradle; a pair of generally parallel cradle lifting bars each being pivotally connected to the reciprocating portion of said air cylinder at one end thereof and pivotally connected to said lifting cradle at the other end thereof; and a torque-holding arm pivotally connected to said lifting cradle at one end thereof and pivotally connected to said anchor at the other end thereof, whereby actuation of said power cylinder horizontally away from said anchor will induce a vertical movement of said lifting cradle while simultaneously maintaining the cradle in a generally horizontal posture.
Claim 2
Dependent Claim
160 words
An air jack comprising: a frame member; an anchor fixedly attached to said frame member at one end thereof and generally normally extending with respect thereto; an air cylinder having a stationary member fixedly attached to said frame member, and a reciprocating member, designed for displacement away from said anchor when the jack is being raised and toward said anchor when the jack is being lowered; a lifting cradle; a pair of generally parallel cradle lifting bars each being pivotally connected to the reciprocating portion of said air cylinder at one end thereof and pivotally connected to said lifting cradle at the other end thereof; and a torque-holding arm pivotally connected to said lifting cradle at one end thereof and pivotally connected to said anchor at the other end thereof, whereby actuation of said power cylinder horizontally away from said anchor will induce a vertical movement of said lifting cradle while simultaneously maintaining the cradle in a generally horizontal posture.
Claim 3
Dependent Claim
42 words
An air jack as defined in claim 1 wherein: said torque-holding arm is pivotally connected to said anchor at an uppermost position thereupon whereby the height of said pivot is greater than or equal to the operating height of said lifting cradle.
Claim 4
Dependent Claim
30 words
An air jack as defined in claim 1 wherein: said reciprocating member is provided with roller means journaled thereto for supporting said reciprocating member in translation upon said frame member.
Claim 5
Dependent Claim
30 words
An air jack as defined in claim 1 and further comprising: a stop member positioned upon said frame remotely from said anchor for limiting the extension of said reciprocating member.
Claim 6
Dependent Claim
29 words
An air jack as defined in claim 1 and further comprising: a jack-stabilizing pad fixedly connected to the underside of the end of the frame remote from said anchor.
Claim 7
Dependent Claim
30 words
An air jack as defined in claim 5 wherein: said jack stabilizing pad is approximately twice as wide as said jack frame to minimize tilting of the object being lifted.
Claim 8
Dependent Claim
51 words
An air jack as defined in claim 5 and further comprising: roller means journaled onto said frame at a position intermediate the ends thereof for facilitating transportation of said air jack and for combining with said jack stabilizing pad to provide a firm bearing arrangement when the jack is being utilized.
Claim 9
Dependent Claim
35 words
An air jack as defined in claim 1 and further comprising: lock means engageable with both said frame and said reciprocating member of said air cylinder for selectively locking said reciprocating member to said frame.
Claim 10
Dependent Claim
56 words
An air jack as defined in claim 8 wherein: said reciprocating member is provided with a plurality of longitudinally aligned apertures and said frame is provided with a compatibly dimensioned aperture positioned such that as the reciprocating member is extended said plurality of longitudinally aligned apertures progressively pass in registry with the aperture in said frame.
Claim 11
Dependent Claim
91 words
An air jack as defined in claim 9 wherein said lock means comprises: a rod running along said frame from a position adjacent the aperture in said frame to a position near the anchor end of said frame, said rod having adjacent said aperture a first normally extending leg and a second leg normally extending with respect to said first leg and adapted to be positioned through the aperture in said frame and a selected aperture in said reciprocatiNg member whereby said reciprocating member may be selectively locked to said frame.
Claim 12
Dependent Claim
32 words
An air jack as defined in claim 1 wherein: said torque-holding arm is provided with a double bend intermediate the ends thereof whereby said air jack may be positioned under low-lying objects.
Claim 13
Dependent Claim
32 words
An air jack as defined in claim 1 and further comprising: spring return means for retracting said reciprocating member within said stationary member when it is desired to lower said air jack.
Claim 14
Dependent Claim
33 words
An air jack as defined in claim 1 and further comprising: a two-way valve connected to said anchor for selectively admitting air to said air cylinder for raising and lowering said air jack.
Claim 15
Dependent Claim
113 words
An air jack lifting mechanism comprising: an anchor member extending generally vertical to the horizontal; a generally horizontal torque-holding arm pivotally connected to the upper end of said anchor member; an air cylinder fixedly connected in a horizontal position against rotation to the bottom of said anchor and having a piston therein for air pressure actuated movement away from said anchor in a generally horizontal direction; a lifting arm pivotally connected to said piston; and a cradle pad pivotally connected to both said torque-holding arm and said lifting arm whereby actuation of said air cylinder induces upward movement of said cradle pad with a small component of movement away from said anchor member.
Claim 16
Dependent Claim
113 words
An air jack lifting mechanism comprising: an anchor member extending generally vertical to the horizontal; a generally horizontal torque-holding arm pivotally connected to the upper end of said anchor member; an air cylinder fixedly connected in a horizontal position against rotation to the bottom of said anchor and having a piston therein for air pressure actuated movement away from said anchor in a generally horizontal direction; a lifting arm pivotally connected to said piston; and a cradle pad pivotally connected to both said torque-holding arm and said lifting arm whereby actuation of said air cylinder induces upward movement of said cradle pad with a small component of movement away from said anchor member.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |