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US 5,771,635 AGranted
Pneumatic device and system
AssigneeXcalibre Equipment, Ltd.
InventorKeith Thomas Skinner
Life of this patent
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AssigneeXcalibre Equipment, Ltd.
InventorKeith Thomas Skinner
Estimating the term…
A pneumatic device 10 comprises a piston 12 moveable along a cylinder 10. The piston has opposite ends 18, 26 defining a space 30 therebetween. The space is divided into two chambers 30a, 30b by a housing 40 fixed relative to the cylinder and having a fluid flow control passageway 42 therethrough. The space 30 is filled with fluid, such as oil. The piston 12 is arranged such that movement thereof against a spring 16 causes the fluid to be displaced from one chamber 30a of the space 30 to the other chamber 30b through the passageway 42. The spring 16 is arranged to apply a return force to the piston 12 and the rate of return of the piston 12 is controlled by the return flow of fluid through the passageway 42. A pneumatic system 100 includes a device 10 connected between first and second members 58, 58a of a building, such as a door and door frame. The pneumatic system comprises a source of compressed gas C for operating the device 10 to enable the device 10 to move the first member 58 relative to the second member 58a, ie to open and close the door. A switching device 72 controls the supply of compressed gas to the device 10.
A pneumatic device comprising a body, the body defining a bore, a piston movable in the bore against a resilient bias, the piston having opposite ends defining a chamber therebetween, a wall provided in the chamber fixed relative to the body and having opposite sides and a fluid flow control aperture therethrough, the chamber being divided by the wall and being filled with fluid, movement of the piston against the resilient bias causing the fluid to be displaced from one side of the wall to the opposte side through the aperture, the resilient bias being arranged to apply a return force to the piston, whereby the rate of return of the piston is controlled by a return flow of fluid through the aperture.
A pneumatic device for connecting between two members, one of which is movable relative to the other at a pre-determined rate, the device comprising a body having a bore, a piston reciprocal in the bore against a resilient bias, rate of movement of the piston being controlled by gas flow control means.
A pneumatic device for connecting between two members, one of which is movable relative to the other at a pre-determined rate, the device comprising a body having a bore, a piston reciprocal in the bore against a resilient bias, the rate of movement of the piston being controlled by gas control means and, the gas flow control means comprising a suitable valve adapted to select an inlet path for movement of the piston against the resilient bias or an outlet path for movement of the piston in the opposite direction.
A pneumatic system including a device comprising a body, the body defining a bore, a piston movable in the bore against a resilient bias, the piston having opposite ends defining a chamber therebetween, a wall being provided in the chamber fixed relative to the body and having opposite sides and a fluid flow control aperture therethrough, the chamber being divided by the wall and being filled with fluid, movement of the piston against the resilient bias causing the fluid to be displaced from one side of the wall to the opposite side through the aperture, the resilient bias being arranged to apply a return force to the piston, whereby the rate of return of the piston is controlled by the return flow of fluid through the aperture, and a source of compressed gas for operating the device to move a first member relative to a second member and a switching device which causes the compressed gas to be suppled to the device.
A pneumatic system including a device comprising a body having a bore, a piston reciprocal in the bore against a resilient bias, a rate of movement of the piston being controlled by gas flow control means, and a source of compressed gas for operating the device to move a first member relative to a second member and a switching device which causes the compressed gas to be supplied to the device.
A pneumatic system including a device comprising a body having a bore, a piston reciprocal in the bore against a resilient bias, a rate of movement of the piston being controlled by gas flow control means, and a source of compressed gas for operating the device to move a first member relative to a second member and a switching device which causes the compressed gas to be supplied to the device, and the device being arranged to open a door when compressed gas is supplied thereto and subsequently to provide a closing movement for the door which is damped for at least part of its return movement.
Dependencies are inferred from the claim text.