Manual/electric twin jack bed
First Claim
1. An apparatus comprising:
- a movably supported base, a support member having an upwardly facing support surface, and fluid actuated support means vertically movably supporting said support member on said base, said support means including manually powered means for selectively effecting upward and downward movement of said support member relative to said base and electrically powered means for selectively effecting upward and downward movement of said support member relative to said base, wherein said support means includes a fluid actuated cylinder having a housing coupled to one off said base and said support member and having a piston rod which is movable relative to said housing between extended and retracted positions and which is coupled to the other of said base and support member, said manually powered means including manually powered pump means for supplying fluid from a fluid source to said cylinder and manually operated valve means for selectively allowing fluid to escape from said cylinder, and wherein said electrically powered means includes electrically powered pump means for selectively supplying fluid from said fluid source to said cylinder and electrically actuated valve means for selectively allowing fluid to escape from said cylinder.
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0 Petitions
Accused Products
Abstract
A mobile hospital stretcher includes a movably supported base, and two spaced hydraulic cylinders on the base which vertically movably support a support member having an upwardly facing support surface. Separate control systems are provided for the hydraulic cylinders, one of which is electrically powered and the other of which is mechanically powered. The electrically powered system includes an electrically actuable valve for selectively bleeding fluid from one of the cylinders, an electrically actuable pump for supplying fluid to the other cylinder, a limit arrangement which produces a signal when the first cylinder is fully retracted, a manually operable switch for electrically actuating the valve, and an arrangement responsive to the presence of the first signal during actuation of the switch for electrically actuating the pump.
59 Citations
14 Claims
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1. An apparatus comprising:
- a movably supported base, a support member having an upwardly facing support surface, and fluid actuated support means vertically movably supporting said support member on said base, said support means including manually powered means for selectively effecting upward and downward movement of said support member relative to said base and electrically powered means for selectively effecting upward and downward movement of said support member relative to said base, wherein said support means includes a fluid actuated cylinder having a housing coupled to one off said base and said support member and having a piston rod which is movable relative to said housing between extended and retracted positions and which is coupled to the other of said base and support member, said manually powered means including manually powered pump means for supplying fluid from a fluid source to said cylinder and manually operated valve means for selectively allowing fluid to escape from said cylinder, and wherein said electrically powered means includes electrically powered pump means for selectively supplying fluid from said fluid source to said cylinder and electrically actuated valve means for selectively allowing fluid to escape from said cylinder.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
- a movably supported base;
a support member having an upwardly facing support surface;
spaced first and second fluid actuated cylinders which each have a housing operatively coupled to one of said base and support member and a piston rod coupled to the other of said base and support member, each said piston rod being movable between extended and retracted positions relative to its housing;
electrically actuable valve means for selectively allowing fluid to escape from said first cylinder;
electrically actuable pump means for selectively supplying fluid to said second cylinder;
limit means for producing a first signal when said piston rod of said first cylinder is in its retracted position;
manually operable switch means for selectively electrically actuating said electrically actuable valve means; and
means responsive to the presence of said signal during actuation of said manually operable switch means for electrically actuating said electrically actuable pump means to supply fluid to said second cylinder. - View Dependent Claims (12)
- a movably supported base;
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13. An apparatus comprising:
- a base;
a support member having an upwardly facing support surface;
spaced fluid actuated first and second cylinders which each have one end supported on said base and a further end supported on said support member and which facilitate vertical movement of said support member relative to said base; and
electrically actuated fluid pump means for simultaneously supplying fluid to each of said first and second cylinders so that said further ends of said first and second cylinders move simultaneously upwardly;
wherein said pump means includes two pumps which each supply fluid to a respective one of said first and second cylinders and a single electric motor having a drive shaft which is drivingly coupled to each of the pumps.
- a base;
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14. An apparatus comprising:
- a base;
a support member having an upwardly facing support surface;
spaced first and second fluid actuated cylinders which each have a housing operatively coupled to one of said base and support member and a piston rod coupled to the other of said base and support member, each said piston rod being movable between extended and retracted positions relative to its housing;
selectively actuable valve means for allowing fluid to escape from said first cylinder;
electrically actuable pump means for selectively supplying fluid to said second cylinder;
limit means for producing a signal when said piston rod of said first cylinder is in its retracted position;
manually operable means for selectively actuating said valve means; and
means responsive to the presence of said signal during actuation of said manually operable means for electrically actuating said electrically actuable pump means to supply fluid to said second cylinder.
- a base;
Specification