US3679174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jack or lift mechanism and drive therefor
Assignee: Individual
•
Filing: 1971-02-10
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Granted: 1972-07-25
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Expires: 1991-02-10
Abstract
Abstract An extendable-retractable member telescopically guided for movement in a guide track having drive means affixed thereto and operatively associated with flexible linkage having its ends secured to the opposite ends of the member for extending and/or retracting the latter relative to the guide track.
Inventors
- 👤 Richard W Boettcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:21
CPC Classifications
B; B60; B60P; B60P3/00; B60P3/32; B60P3/36; B60P3/38; B60S; B60S9/00; B60S9/02; B60S9/04; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18568; Y10T74/18832; Y10T74/1884
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
161 words
An extendable-retractable mechanism in the nature of a jack and the like comprising: a. a pair of members arranged for movement lengthwise relative to each other; b. a drive mechanism mounted on one of said members including powered means laterally thereof; c. a strand of flexible linkage having its opposite ends secured to the ends of the other one of said members; d. a pair of idler wheels mounted on said drive mechanism in spaced relation relative to each other and in tangential engagement with the strand of flexible linkage between the ends of said other one of said members; and e. a medial portion of said flexible linkage extending from said idler wheels laterally into said drive mechanism and trained about said powered means for lengthening one end of said strand of flexible linkage and shortening the opposite end of said flexible linkage relative to its medial portion for extending and retracting said pair of meMbers relative to each other.
Claim 2
Dependent Claim
161 words
An extendable-retractable mechanism in the nature of a jack and the like comprising: a. a pair of members arranged for movement lengthwise relative to each other; b. a drive mechanism mounted on one of said members including powered means laterally thereof; c. a strand of flexible linkage having its opposite ends secured to the ends of the other one of said members; d. a pair of idler wheels mounted on said drive mechanism in spaced relation relative to each other and in tangential engagement with the strand of flexible linkage between the ends of said other one of said members; and e. a medial portion of said flexible linkage extending from said idler wheels laterally into said drive mechanism and trained about said powered means for lengthening one end of said strand of flexible linkage and shortening the opposite end of said flexible linkage relative to its medial portion for extending and retracting said pair of meMbers relative to each other.
Claim 3
Dependent Claim
52 words
The mechanism in accordance with that of claim 1 in which one of said pair of members has footing means thereon adapted for engaging a firm foundation and in which the other one of said members has means thereon for bearing against a body to be moved relative to said footing means.
Claim 4
Dependent Claim
57 words
The mechanism in accordance with that of claim 2 in which said guide track member has said drive mechanism and powered means secured thereto and has the other one of said members guided for sliding movement lengthwise relative to said guide track by the entrainment of the medial portion of said flexible linkage about said powered means.
Claim 5
Dependent Claim
102 words
The mechanism in accordance with that of claim 3 in which said drive mechanism and powered means comprises: a. a housing mounted on said guide track member so as to extend laterally therefrom; b. a worm gear mounted within said housing having a worm screw disposed with its axis extending normal relative to said guide track member, and a worm wheel journaled within said housing transversely of said worm screw and in mesh therewith; c. drive means secured concentric to said worm wheel affording entrainment of the medial portion of said flexible linkage thereabout; and d. means for turning said worm screw.
Claim 6
Dependent Claim
37 words
The mechanism in accordance with that of claim 4 in which said means for turning said worm screw comprises a reversible electric motor, and a belt and pulley drive connection between said motor and said worm screw.
Claim 7
Dependent Claim
57 words
The mechanism in accordance with that of claim 5 in which said flexible linkage is a link chain, and in which said drive means secured to said worm wheel is a sprocket having the laterally extending medial portion of said chain looped about it, and in which said idler wheels are idler sprockets for said link chain.
Claim 8
Dependent Claim
43 words
The mechanism in accordance with that of claim 5 including reversible electrical circuits for said electrical motor, and a limit switch in each of said reversible electrical circuits for limiting the extension and retraction of said pair of members relative to each other.
Claim 9
Dependent Claim
74 words
The jack mechanism in accordance with that of claim 7 in which said guide track member has an earth engaging foot at one end thereof and in which the other one of said members guided in said guide track has a body engaging pad on that end thereof opposite to the earth engaging foot on said guide track, and means for pivotally securing said pad to the underside of a body to be moved.
Claim 10
Dependent Claim
58 words
The jack means in accordance with that of claim 8 including a hook means of such body in spaced relation to said means for pivotally securing said pad to the body a distance substantially equal to the length of said pair of members in retracted condition for temporarily securing said jack mechanism in storage condition on said body.
Claim 11
Dependent Claim
68 words
The jack mechanism in accordance with that of claim 9 including a releasable latch means on said means for pivotally securing said pad to the body, and cam means on said pad for engaging said releasable latch means upon arrival of said jack mechanism from storage to operative condition for securing the jack mechanism to enable movement of the body upon extension and retraction of the jack mechanism.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |