Patent US3788604A successfully refreshed from Google Patents.
US3788604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical jack
Assignee: VIL HOLDINGS Ltd 3RD FLOOR 736 BROUGHTON STREET VICTORIA BC V8W 2E1
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Filing: 1972-05-25
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Granted: 1974-01-29
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Expires: 1992-05-25
Abstract
Abstract A camper jack of the kind in which two tubes are provided, the first tube being telescopically movable within the second and having a plurality of regularly spaced axially aligned apertures. A toothed wheel is journalled on the second tube and engages in the apertures in the first tube through a suitable aperture provided in the wall of the second tube so as to prevent relative rotation of the two tubes. Also mounted on the second tube are a latch and means for pivotally mounting a jacking lever carrying a pawl for engagement with the axially aligned apertures to cause extension of the jack.
Inventors
- 👤 C Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:37
CPC Classifications
B; B66; B66F; B66F1/00; B66F1/02; B66F1/04; B66F1/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
268 words
A mechanical jack assembly, comprising a first tube having a foot plate for engagement with the ground and formed with a plurality of regularly spaced axially aligned rectangular apertures, a second tube within which said first tube is located for axial sliding movement, said second tube being formed with axially aligned slot means, means mounted on said first and second tubes for maintaining said tubes in substantially coaxial relation, a toothed atoothed wheel journalled on said second tube for engagement with said rectangular apertures in said first tube through said slot means to prevent relative rotation of said tubes, the teeth on said toothed wheel being of substantially the same width as but substantially thinner than the height of said slots, a spring loaded latching pawl plate journalled on said second tube for engagement with one of said rectangular apertures through said slot means, a bar pivoted at one end to said second tube for movement in a plane including the axes of the tubes and provided with interlocking means at the other end for engagement with cooperating means provided on a lever, and a tubular lever having means at one end for cooperation with said interlocking means at the other end of said bar to retain the lever on the bar, and having an actuating pawl pivoted diametrically thereto for engagement with said rectangular apertures through the said slot means, spring means being provided on said lever for urging said actuating pawl into engagement with said rectangular apertures whereby pivotal movement of saId tubular lever causes repetitive engagement with said apertures to cause extension of the jack.
Claim 2
Dependent Claim
268 words
A mechanical jack assembly, comprising a first tube having a foot plate for engagement with the ground and formed with a plurality of regularly spaced axially aligned rectangular apertures, a second tube within which said first tube is located for axial sliding movement, said second tube being formed with axially aligned slot means, means mounted on said first and second tubes for maintaining said tubes in substantially coaxial relation, a toothed atoothed wheel journalled on said second tube for engagement with said rectangular apertures in said first tube through said slot means to prevent relative rotation of said tubes, the teeth on said toothed wheel being of substantially the same width as but substantially thinner than the height of said slots, a spring loaded latching pawl plate journalled on said second tube for engagement with one of said rectangular apertures through said slot means, a bar pivoted at one end to said second tube for movement in a plane including the axes of the tubes and provided with interlocking means at the other end for engagement with cooperating means provided on a lever, and a tubular lever having means at one end for cooperation with said interlocking means at the other end of said bar to retain the lever on the bar, and having an actuating pawl pivoted diametrically thereto for engagement with said rectangular apertures through the said slot means, spring means being provided on said lever for urging said actuating pawl into engagement with said rectangular apertures whereby pivotal movement of saId tubular lever causes repetitive engagement with said apertures to cause extension of the jack.
Claim 3
Dependent Claim
218 words
An extensible support post for use, in cooperation with a pawl pivotally mounted on a lever, as a mechanical jack, said support post comprising a first tube formed with a plurality of regularly spaced, axially aligned parallel sided apertures, a second tube within which said first tube is located for relative axial movement of the tubes, latching means mounted on said second tube for releasably latching said first tube against said relative movement in a direction to contract the post, fulcrum means on said second tube for engagement by said lever so as to permit pivotal movement of the lever in a plane including the common axes of said first and second tubes, whereby repeated pivotal movement of the lever causes sequential repeated engagement of the pawl in said apertures to extend the jack, journal means mounted on said second tube, and a star wheel journalled for rotation in said journal means, said star wheel having teeth meshing with said apertures, with each tooth being of substantially the same width as an aperture but having a thickness substantially less than the height of an aperture, whereby arcuate movement of the teeth into and out of the first tube through said apertures is permitted and relative rotation of the tubes is prevented during extension or retraction of the post.
Claim 4
Dependent Claim
218 words
An extensible support post for use, in cooperation with a pawl pivotally mounted on a lever, as a mechanical jack, said support post comprising a first tube formed with a plurality of regularly spaced, axially aligned parallel sided apertures, a second tube within which said first tube is located for relative axial movement of the tubes, latching means mounted on said second tube for releasably latching said first tube against said relative movement in a direction to contract the post, fulcrum means on said second tube for engagement by said lever so as to permit pivotal movement of the lever in a plane including the common axes of said first and second tubes, whereby repeated pivotal movement of the lever causes sequential repeated engagement of the pawl in said apertures to extend the jack, journal means mounted on said second tube, and a star wheel journalled for rotation in said journal means, said star wheel having teeth meshing with said apertures, with each tooth being of substantially the same width as an aperture but having a thickness substantially less than the height of an aperture, whereby arcuate movement of the teeth into and out of the first tube through said apertures is permitted and relative rotation of the tubes is prevented during extension or retraction of the post.
Claim 5
Dependent Claim
18 words
An extensible support post as claimed in claim 2, wherein said latching means are engageable in said apertures.
Claim 6
Dependent Claim
53 words
A mechanical jack as claimed in claim 2 and further comprising means for maintaining said first and second tubes in substantially coaxial relation, said maintaining means comprising at least one set of two or more circumferentially arranged pin members extending radially from one of said tubes into end engagement with the other tube.
Claim 7
Dependent Claim
49 words
A mechanical jack as claimed in claim 4, wherein each pin member has a head bearing on said other tube and a shank located in an aperture provided in said one of said tubes, said pin member being retained in position by a friction washer engaging over said shank.
Claim 8
Dependent Claim
62 words
A mechanical jack as claimed in claim 4, wherein a first set of said pin members is provided on the first tube at one end thereof for centering engagement with the second tube and a second set of said pin members is provided on the second tube for engagement with the first tube at the end thereof remote from said first set.
Claim 9
Dependent Claim
16 words
A lever operated jack as claimed in claim 4, wherein said pins are made of brass.
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) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |