Claims
- 1. A hydraulic chair lift, comprising,
- a single angular upwardly extending support beam;
- a vertically extending cylinder assembly affixed at its lower end to an upper end of said support beam, said support beam adapted to be affixed to a horizontal surface at a lower end;
- a piston rod movably retained within said cylinder assembly;
- a seat assembly attached to said piston rod; and,
- a valve affixed to said cylinder assembly.
- 2. The hydraulic chair lift of claim 1 wherein said vertically extending cylinder assembly has an upper and a lower end, said support beam being removably attached to said cylinder assembly at said lower end.
- 3. The hydraulic chair lift of claim 2 wherein said piston rod extends downward from said lower end of said cylinder assembly.
- 4. The hydraulic chair lift of claim 1 wherein said support beam is rotatably affixed to the ground.
- 5. The hydraulic chair of claim 4 wherein said support beam is further comprised of:
- a downwardly extending tube;
- a socket bearing which receives said tube;
- a socket;
- wherein said socket is placed in the ground and receives said socket bearing and wherein said downwardly extending tube is securely inserted within said socket bearing.
- 6. The hydraulic chair lift of claim 5 further comprising a rotation lock mechanism for preventing said support beam from rotating when said lock mechanism is engaged.
- 7. The hydraulic chair lift of claim 6 wherein said rotation lock mechanism is comprised of:
- a pivoting control pivotally attached to said support beam;
- a lock pin attached to one end of said pivoting control.
- 8. The hydraulic chair lift of claim 1 wherein said support beam is removably attached to said cylinder assembly by a clamp.
- 9. The hydraulic chair lift of claim 1 wherein a pressurized water source is in flow communication with said valve means and said cylinder assembly.
- 10. The hydraulic chair lift of claim 1 wherein said cylinder assembly is further comprised of:
- an exterior cylindrical housing to retain said cylinder assembly, said piston rod extending centrally through said exterior cylindrical housing;
- a key guide securely retained within the interior of said piston rod;
- a key which extends through said key guide and downward into said piston rod and is affixed at its top end to said exterior cylindrical housing,
- a retaining disc extending radially outward from the top end of said piston rod;
- a floating piston which travels vertically with said piston rod and engages said retaining disc;
- an upper seal directly below said floating piston;
- a spacer pipe below said upper seal;
- a lower seal below said spacer pipe;
- a centering guide below said lower seal through which extends said piston rod;
- wherein said floating piston is secured between said upper seal and said retaining disc and wherein said valve allows water to enter between said upper seal and said lower seal.
- 11. The hydraulic chair of claim 10 wherein said support beam is affixed to said cylinder assembly at a point near said lower seal.
- 12. A hydraulic chair lift comprised of:
- an upwardly extending support beam;
- a vertically extending cylinder assembly affixed at its lower end to said support beam, said support beam adapted to be affixed to a horizontal surface at the opposite end;
- a seat assembly vertically movable along said cylinder assembly;
- valve means affixed to said cylinder assembly;
- a rotation lock mechanism for preventing said support beam from rotating when said lock mechanism is engaged.
- 13. The hydraulic chair lift of claim 12 wherein said rotation lock mechanism is comprised of:
- a pivoting control pivotally attached to said support beam;
- a lock pin attached to one end of said pivoting control.
- 14. The hydraulic chair lift of claim 13 wherein said rotation lock mechanism is further comprised of a socket bearing having notches thereon which receive said lock pin to retain said support beam in position.
- 15. The hydraulic chair lift of claim 12 wherein said rotation lock mechanism is comprised of a socket plate and said support beam further has a tube extending downward therefrom, said socket plate having a socket assembly depending therebelow, said socket assembly receiving said tube.
- 16. A cylinder assembly for a hydraulic chair lift, comprising:
- an exterior cylinder housing;
- a piston rod extending centrally through said exterior cylindrical housing and having a radially extending retaining disc at its top end;
- a key guide secured within Me interior of said piston rod;
- a key which extends through said key guide and downward into said piston rod and affixed at its top end to said exterior cylindrical housing,
- a floating piston which travels vertically with said piston rod and engages said retaining disc;
- an upper seal directly below said floating piston;
- a spacer pipe below upper seal;
- a lower seal below said spacer pipe; and,
- valve means affixed to said cylinder assembly between said upper seal and said lower seal.
- 17. The cylinder assembly of claim 16 wherein said floating piston is secured between said upper seal and said retaining disc and wherein said valve allows water to enter between said upper seal and said lower seal.
- 18. The cylinder assembly of claim 16 further comprising at least one spacer pipe between said upper and lower seal.
- 19. The cylinder assembly of claim 16 wherein said key and said key guide is square.
Parent Case Info
This application claims the benefit of U.S. Provisional No. 60/041,356 filed Mar. 21, 1997.
US Referenced Citations (10)