US3848851A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jacking device
Assignee: Dell Holdings Ltd
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Filing: 1973-08-28
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Granted: 1974-11-19
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Expires: 1993-08-28
Abstract
Abstract A jacking device consisting of first and second tubular members which are telescoped with respect to one another and provided with a simple and inexpensive means for adjusting the length thereof. The device also includes a third tubular member telescoped with respect to the first tubular member and a spring for urging the third tubular member to an extended position with respect to the first tubular member. Simplicity in the adjustment means is achieved by forming a series of longitudinally spaced passages in the second tubular member and forming a support shoulder which includes an annular collar on the other tubular member at one end thereof. The adjustment device consists of a bracket and a lever arm pivotally mounted on the bracket. In use, one end of the lever arm is located within one of the longitudinal passages of the second tubular member and the free end of the bracket is mounted on the support shoulder of the first tubular member. The lever arm is then pivoted about the fulcrum mounting on the bracket to cause the free end of the lever arm to engage the second tubular member and to move the second tubular member outwardly with respect to the first tubular member, the bracket acting as a support for the fulcrum point of the lever arm. A simple mounting for the third telescopic member is achieved by forming rearwardly inwardly directed waist portions in the first tubular member and the third tubular member and locating a pair of discs outwardly from each waist member and retaining each disc against a predetermined movement with respect to one another by extending a bolt therebetween.
Inventors
- 👤 M Elias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:58
CPC Classifications
B; B66; B66F; B66F1/00; B66F1/02; B66F1/04; B66F1/06; E; E04; E04G; E04G21/00; E04G21/32; E04G21/3204; E04G21/3223; E04G21/3233; E04G25/00; E04G25/04; E04G25/06; E04G25/061; E04G5/00; E04G5/14; E04G2005/148; E04G2025/045
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
243 words
A jacking device comprising a. a first tubular member, b. a second tubular member telescopically mounted within said first tubular member and projecting outwardly from one end of said first tubular member, c. adjustment means for adjusting the position of said second tubular member with respect to said first tubular member, d. said adjustment means consisting of a bracket member and a lever member, said bracket member having an inner end anD an outer end, fulcrum means pivotally mounting said lever member with respect to said bracket member with a first end of said lever member projecting outwardly from one side of said fulcrum means and a second end of said lever member projecting outwardly from the other side of said fulcrum means, said outer end of said bracket being adapted to engage said one end of said first tubular member to support said bracket means in a position with said fulcrum means spaced outwardly from said first and second tubular means, e. a plurality of longitudinally spaced passages opening inwardly of said second tubular member for engaging said first end of said lever whereby said second tubular member may be telescoped with respect to said first member in response to movement of said second end of said lever about said fulcrum means, and f. means for locking said first tubular member with respect to said second tubular member to prevent inward telescoping of said second member with respect to said first member.
Claim 2
Dependent Claim
243 words
A jacking device comprising a. a first tubular member, b. a second tubular member telescopically mounted within said first tubular member and projecting outwardly from one end of said first tubular member, c. adjustment means for adjusting the position of said second tubular member with respect to said first tubular member, d. said adjustment means consisting of a bracket member and a lever member, said bracket member having an inner end anD an outer end, fulcrum means pivotally mounting said lever member with respect to said bracket member with a first end of said lever member projecting outwardly from one side of said fulcrum means and a second end of said lever member projecting outwardly from the other side of said fulcrum means, said outer end of said bracket being adapted to engage said one end of said first tubular member to support said bracket means in a position with said fulcrum means spaced outwardly from said first and second tubular means, e. a plurality of longitudinally spaced passages opening inwardly of said second tubular member for engaging said first end of said lever whereby said second tubular member may be telescoped with respect to said first member in response to movement of said second end of said lever about said fulcrum means, and f. means for locking said first tubular member with respect to said second tubular member to prevent inward telescoping of said second member with respect to said first member.
Claim 3
Dependent Claim
46 words
A jacking device as claimed in claim 1 including slot means in said one end of said first tubular member for receiving said outer end of said bracket to secure said bracket against circumferential movement with respect to said one end of said first tubular member.
Claim 4
Dependent Claim
45 words
A jacking device as claimed in claim 1 including collar means secured to said first tubular member at said one end thereof and projecting radially outwardly therefrom and cooperating with said end of said first tubular member to provide a radially extending bracket support surface.
Claim 5
Dependent Claim
39 words
A jacking device as claimed in claim 3 including slot means in said radially extending support surface for receiving said outer end of said bracket to secure said bracket against circumferential movement with respect to said first tubular member.
Claim 6
Dependent Claim
57 words
A jacking device as claimed in claim 2 wherein said outer end of said bracket is formed to provide a pair of legs which are spaced apart a distance sufficient to be located on diametrically opposite sides of said second tubular member, the outer ends of said legs being rounded for pivotal engagement in said slot means.
Claim 7
Dependent Claim
47 words
A jacking device as claimed in claim 1 wherein said outer end of said bracket is formed to provide a pair of legs which are spaced apart a distance sufficient to permit said means for locking said tubular member to pass therebetween to engage said tubular members.
Claim 8
Dependent Claim
69 words
A jacking device as claimed in claim 3 wherein said bracket member has a bifurcated end for engaging said one end of said first tubular member means at diametrically opposite sides of said first tubular member, said lever means being pivotably connected to said bracket in a plane disposed between the bifurcated ends of said bracket whereby said bifurcated ends form a stable support for said lever in use.
Claim 9
Dependent Claim
49 words
A jacking device as claimed in claim 1 including a third tubular member telescopically mounted within the other end of said first tubular member for movement between a first retracted position and a second extended position and means for resiliently urging said third tubular member towards said extended position.
Claim 10
Dependent Claim
80 words
A jacking device as claimed in claim 8 wherein said second tubular member is formed to provide a radially inwardly projecting annular waist portion adjacent said other end thereof, said means resiliently urging said third portion towards said extended position comprising compression spring having one end thereof bearing against said inwardly projecting waist portion of said second tubular member and the other end bearing against the end of said third tubular member which is telescoped within said first tubular member.
Claim 11
Dependent Claim
35 words
A jacking device as claimed in claim 9 wherein said third tubular member is formed to provide a radially inwardly projecting waist portion adjacent the end thereof which is telescoped within said first tubular member.
Claim 12
Dependent Claim
67 words
A jacking device as claimed in claim 10 including means for retaining said third tubular member in a telescoped relationship With respect to said first tubular member comprising a pair of discs members spaced from one another by said waist means of said first tubular member and said waist means of said third tubular member, and tie rod means extending between said first and second disc members.
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) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |