US3897044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camper jack
Assignee: Individual
•
Filing: 1974-05-15
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Granted: 1975-07-29
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Expires: 1994-05-15
Abstract
Abstract A jack for vehicles known widely as campers has two tubes in telescoping relationship with each other and a hydraulic handactuated pump serves to move one of the tubes outwardly of the other when operated. When the tube is moved into retracted position, it is securely held in that position by a releasable detent button on the inner tube which extends into a cylindrical walled hole in the outer tube. The button is riveted midway between opposite ends of a wide arcuate clock-type spring which is nested within the inner wall of the inner tube.
Inventors
- 👤 Erven Tallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:21
CPC Classifications
B; B66; B66F; B66F3/00; B66F3/24; B60; B60S; B60S9/00; B60S9/02; B60S9/10; B60S9/12; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32254; Y10T403/32426; Y10T403/32442; Y10T403/32451; Y10T403/32459
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
269 words
A jack for attachment to a vehicle and adapted to be carried thereby at a location in readiness for lowering to extended position, said jack comprising an inner hollow tubular rod and an outer hollow tubular rod in telescoping relationship, a free end of the outer of said tubular rods having a cylindrical walled hole in the wall of the tubular rod at a location spaced from and adjacent a free end of said outer tubular rod, the inner of said tubular rods having a cylindrical walled hole at a location spaced from and adjacent a free end thereof of substantially the same size as said first identified cylindrical walled hole, and a button having a diameter providing a free sliding fit of said button in said holes, the button having a length about equal to the aggregate depth of said two holes, and spring means biased in a direction adapted to extend the button into said holes when the holes are in alignment in retracted position of the inner of said tubular rods, and spring means comprising a flat spring member having a convex Outer face parallel to the longitudinal axis of said inner tubular rod and having a width greater than the diameter of said button and an arcuate length slightly less than the inside circumference of said inner tubular rod, said button having an inward extension thereon anchored to the flat spring intermediate its ends, portions of said spring member on opposite sides of said button being substantially equal in length and extending for substantially equal distances around the inside wall of said inner tubular rod.
Claim 2
Dependent Claim
269 words
A jack for attachment to a vehicle and adapted to be carried thereby at a location in readiness for lowering to extended position, said jack comprising an inner hollow tubular rod and an outer hollow tubular rod in telescoping relationship, a free end of the outer of said tubular rods having a cylindrical walled hole in the wall of the tubular rod at a location spaced from and adjacent a free end of said outer tubular rod, the inner of said tubular rods having a cylindrical walled hole at a location spaced from and adjacent a free end thereof of substantially the same size as said first identified cylindrical walled hole, and a button having a diameter providing a free sliding fit of said button in said holes, the button having a length about equal to the aggregate depth of said two holes, and spring means biased in a direction adapted to extend the button into said holes when the holes are in alignment in retracted position of the inner of said tubular rods, and spring means comprising a flat spring member having a convex Outer face parallel to the longitudinal axis of said inner tubular rod and having a width greater than the diameter of said button and an arcuate length slightly less than the inside circumference of said inner tubular rod, said button having an inward extension thereon anchored to the flat spring intermediate its ends, portions of said spring member on opposite sides of said button being substantially equal in length and extending for substantially equal distances around the inside wall of said inner tubular rod.
Claim 3
Dependent Claim
26 words
A camper jack as defined in claim 1 wherein there is a transverse foot plate at the free end of the inner of said tubular rods.
Claim 4
Dependent Claim
45 words
A camper jack as defined in claim 1 wherein the width of the flat spring member is substantially three times the diameter of the button and portions of said convex outer face lie in tangential contact with the inside wall of said inner tubular rod.
Claim 5
Dependent Claim
61 words
A camper jack as defined in claim 3 wherein the button is anchored to the spring substantially midway between the ends and the ends are adjacent and spaced from each other on the opposite side of the inner of said tubular rods, said ends being parallel to each other and in engagement with the inside wall of said inner tubular rod.
Claim 6
Dependent Claim
43 words
A camper jack as defined in claim 1 wherein the outer of said tubular rods is anchored in vertical position to the vehicle and the free ends of said tubular rods when in retracted position are adjacent the lowermost portion of the vehicle.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |