Patent US3799036A successfully refreshed from Google Patents.
US3799036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-locking fluid operated cylinder
Assignee: Individual
•
Filing: 1972-07-17
•
Granted: 1974-03-26
•
Expires: 1992-07-17
Abstract
Abstract A fluid operated cylinder is described having a locking means for holding the piston at one end of the cylinder every other time fluid pressure is applied to the cylinder to drive the piston in one axial direction. A locking means is provided adjacent said one end having a control member that is movable in a limited stroke parallel with and in response to the movement of the piston. The control member is also rotatable. Inclined stepping cam surfaces are provided in the longitudinal path of the control member to step index the control member in one angular direction each time the control member is moved axially. Interlocking elements are provided on the control member and the piston that interlock together when the control member is rotated from a selected angular position and automatically released when the control member is located at the selected angular positions.
Inventors
- 👤 R Slaughter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:41
CPC Classifications
F; F15; F15B; F15B15/00; F15B15/20; F15B15/26; F15B15/261; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526; Y10T74/1529
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
329 words
An automatic self-locking fluidized cylinder, comprising: a cylinder housing having an enclosed elongated fluid receiving cavity therein between two ends; a piston mounted in the cavity for longitudinal movement between the ends in response to the application of fluid pressure thereto; a releasable locking means responsive to the movement of the piston at one end for (1) automatically operatively locking the piston to the housing at the one end when fluid pressure is applied to the piston to drive the piston to the one end and the pressure is then released and (2) for automatically releasing the operatively locked piston to permit the piston to return to the other end when fluid pressure is subsequently applied to the piston in the same direction and the pressure is then released, in which the releasably locking means includes; a control member mounted with respect to the housing (1) for rotational movement about an axis parallel with the movement of the piston to and from a prescribed angular position, and (2) for axial movement in a path along the axis in response to the movement of the piston at said one end; means for angularly rotating the control member to and from the prescribed angular position in response to the axial movement of the control member to position the control member angularly displaced the prescribed angular position when fluid pressure is applied to the piston to drive the piston to the one end and the pressure is then released and to position the control member at the prescribed angular position when fluid pressure is subsequently apPlied to the piston in the same direction and the pressure is then released; and interlocking means responsive to the rotational movement of the control member for operatively interconnecting the piston to the housing when the control member is rotated from the prescribed angular position and for releasing the piston from operatively interlocking with the housing when the control member is rotated to the prescribed angular position.
Claim 2
Dependent Claim
329 words
An automatic self-locking fluidized cylinder, comprising: a cylinder housing having an enclosed elongated fluid receiving cavity therein between two ends; a piston mounted in the cavity for longitudinal movement between the ends in response to the application of fluid pressure thereto; a releasable locking means responsive to the movement of the piston at one end for (1) automatically operatively locking the piston to the housing at the one end when fluid pressure is applied to the piston to drive the piston to the one end and the pressure is then released and (2) for automatically releasing the operatively locked piston to permit the piston to return to the other end when fluid pressure is subsequently applied to the piston in the same direction and the pressure is then released, in which the releasably locking means includes; a control member mounted with respect to the housing (1) for rotational movement about an axis parallel with the movement of the piston to and from a prescribed angular position, and (2) for axial movement in a path along the axis in response to the movement of the piston at said one end; means for angularly rotating the control member to and from the prescribed angular position in response to the axial movement of the control member to position the control member angularly displaced the prescribed angular position when fluid pressure is applied to the piston to drive the piston to the one end and the pressure is then released and to position the control member at the prescribed angular position when fluid pressure is subsequently apPlied to the piston in the same direction and the pressure is then released; and interlocking means responsive to the rotational movement of the control member for operatively interconnecting the piston to the housing when the control member is rotated from the prescribed angular position and for releasing the piston from operatively interlocking with the housing when the control member is rotated to the prescribed angular position.
Claim 3
Dependent Claim
53 words
The self-locking cylinder as defined in claim 1 wherein the means for angularly rotating the control member includes: cam means mounted in the path of the control member for engaging and angularly rotating the control member to and from the prescribed angular position in response to the axial movement of the control member.
Claim 4
Dependent Claim
78 words
The self-locking cylinder as defined in claim 2 wherein the cam means includes at least two oppositely inclined axially spaced step indexing cam surfaces angularly overlapping and extending about said axis; and wherein the control member has a cam follower for engaging and following the inclination of said cam surfaces as the control member is moved axially in response to the movement of the piston to rotatably index the control member to and from the prescribed angular position.
Claim 5
Dependent Claim
86 words
The self-locking cylinder as defined in claim 3 wherein the piston has an interlocking element carried thereby and wherein the control member includes a body that is slidably mounted with respect to the housing adjacent the one end, said body having an interlocking element carried thereby which interlockingly engages with the piston interlocking element when the control member is angularly displaced from the prescribed angular position and interlockingly disengages with the piston interlocking element when the control member is angularly positioned at the prescribed angular position.
Claim 6
Dependent Claim
130 words
A self-locking cylinder as defined in claim 3 wherein the cam means includes two axially spaced opposed cams, one cam being positioned to engage the cam follower when the control member is being moved in one axial direction as the piston approaches said one end and the other cam being positioned to engage the cam follower when the control member is being moved in the other axial direction as the piston starts back from the one end towards the other end, each of said cams having a plurality of equally spaced cam surfaces that are directed in the same rotational direction, with each cam surface overlapping a corresponding surface of the opposed cam to step index the control member about its axis and as the control member is moved axially.
Claim 7
Dependent Claim
100 words
The self-locking cylinder as defined in claim 5 wherein the control member is rotatable to and from two diametrically opposed prescribed angular positions and wherein each of the cam surfaces extend in the same radial direction from a lobe to a dwell in which the dwells of each cam are angularly spaced approximately 90* from each other with the dwells of one cam being angularly offset from the dwells of the other cam to cause the control member to rotate 90* each time the control member is moved in one axial direction and then moved in the other axial direction.
Claim 8
Dependent Claim
70 words
The self-locking cylinder as defined in claim 6 wherein the locking means includes an interlocking element carried by the piston and a complementary interlocking element carried by the control member to releasably interlock with each other to secure the piston to the control member when the piston is adjacent said one end, said interlocking elements being releasable when the control member is rotated to the diametrically opposed prescribed angular positions.
Claim 9
Dependent Claim
61 words
The self-locking cylinder as defined in claim 1 wherein the locking means includes an interlocking element carried by the piston and a complementary interlocking element carried by the control member in which the interlocking elements are adapted to interlock with each other and secure the piston to the control member when the control member is rotated from the prescribed angular position.
Claim 10
Dependent Claim
117 words
The self-locking cylinder as defined in claim 8 wherein one of the interlocking elements has an interior angular shoulder facing said other end of the cavity with a longitudinal slot formed in the shoulder at an angular position corresponding to the prescribed angular position of the control member and wherein the other interlocking element has a radial projection adapted to be inserted into the slot when the piston is moved to said one cavity end and for being rotated in response to the movement of the control member from the prescribed angular position to engage said shoulder when the piston starts toward the other cavity end to prevent the piston from returning to the other cavity end.
Claim 11
Dependent Claim
36 words
The self-locking cylinder as defined in claim 5 wherein the cams are continuous about the axis with the cam surfaces of each cam interconnected to limit the axial movement of control member to a limited stroke.
References Cited (Backward Citations)
US2632426A
Cited
US2826099A
Cited
US2923206A
Cited
US3094883A
Cited
US3147770A
Cited
US3150569A
Cited
US3342111A
Cited
US3241569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |