US3736645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Assembly method for hydraulic energy absorbers
Assignee: Motors Liquidation Co
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Filing: 1971-11-05
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Granted: 1973-06-05
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Expires: 1991-11-05
Abstract
Abstract An hydraulic energy absorber unit comprising telescopic cylinder and piston tubes defining variable volume liquid-filled chambers therein and adapted to absorb energy upon displacement from a rest or normal extended position to an inwardly telescoped position is assembled in a manner to have one of the variable volume chambers filled in the rest position of the unit with a predetermined quantity of reserve fluid transmitting to the remainder of the unit a preload force exerted by a spring chamber piston within the piston tube. The piston tube subassembly is loaded with a gas at an initial predetermined pressure prior to insertion thereof within the cylinder tube subassembly filled with liquid, such insertion being accomplished with the aid of a sealing ring on the piston tube which causes the latter to displace the predetermined quantity of fluid into the piston tube chamber and further pressurize the gas spring up to the final desired pressure, whereafter the piston and cylinder tube subassemblies are provided with a one-way limit stop preventing further extension of the unit from the rest or as-assembled normal extended position.
Inventors
- 👤 W Fannin
- 👤 L Gute
- 👤 W Zimmerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:34
CPC Classifications
B; B60; B60R; B60R19/00; B60R19/02; B60R19/24; B60R19/26; B60R19/32; F; F16; F16F; F16F9/00; F16F9/32; F16F9/3271; F16F9/48; F16F9/486; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49808; Y10T29/49826; Y10T29/4984; Y10T29/49904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
222 words
In a method of assembling an hydraulic damping device with a preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume spring chamber defined by a movable piston slidable within such piston tube, said piston tube further including an external sealing ring engageable with the inside wall of said cylinder tube, the steps comprising, loading said movable piston with a spring force-producing element expanding said spring chamber to a maximum wherein said movable piston engages said piston wall of the piston tube, filling said cylinder tube with a damping fluid, inserting said loaded piston tube into said cylinder tube to engage said sealing ring with the inside wall of the latter, further inserting said piston tube and sealing ring thereon within said cylinder tube a predetermined amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to within the latter to in turn displace the movable piston therewithin against the bias of said spring force, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 2
Dependent Claim
222 words
In a method of assembling an hydraulic damping device with a preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume spring chamber defined by a movable piston slidable within such piston tube, said piston tube further including an external sealing ring engageable with the inside wall of said cylinder tube, the steps comprising, loading said movable piston with a spring force-producing element expanding said spring chamber to a maximum wherein said movable piston engages said piston wall of the piston tube, filling said cylinder tube with a damping fluid, inserting said loaded piston tube into said cylinder tube to engage said sealing ring with the inside wall of the latter, further inserting said piston tube and sealing ring thereon within said cylinder tube a predetermined amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to within the latter to in turn displace the movable piston therewithin against the bias of said spring force, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 3
Dependent Claim
225 words
In a method of assembling an hydraulic damping device with a gas spring preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume gas spring chamber defined by a movable piston slidable within such piston tube, said piston tube further including an external sealing ring engageable with the inside wall of said cylinder tube, the steps comprising, filling said piston tube with a quantity of gas at a first predetermined pressure calculated with reference to a second and final predetermined pressure attained upon completion of the last of the subjoined steps, filling said cylindEr tube with a damping fluid to a predetermined level, inserting said gas-filled piston tube into said cylinder tube to engage said sealing ring with the upper marginal edge of the inside wall of the latter, further inserting said piston tube and sealing ring thereon within said cylinder tube a predetermined amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to within the latter, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 4
Dependent Claim
225 words
In a method of assembling an hydraulic damping device with a gas spring preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume gas spring chamber defined by a movable piston slidable within such piston tube, said piston tube further including an external sealing ring engageable with the inside wall of said cylinder tube, the steps comprising, filling said piston tube with a quantity of gas at a first predetermined pressure calculated with reference to a second and final predetermined pressure attained upon completion of the last of the subjoined steps, filling said cylindEr tube with a damping fluid to a predetermined level, inserting said gas-filled piston tube into said cylinder tube to engage said sealing ring with the upper marginal edge of the inside wall of the latter, further inserting said piston tube and sealing ring thereon within said cylinder tube a predetermined amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to within the latter, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 5
Dependent Claim
248 words
In a method of assembling an hydraulic damping device with a preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume spring chamber defined by a movable piston slidable within such piston tube, said piston tube further including remote from said piston wall an external sealing ring engageable with the inside wall of said cylinder tube, the steps comprising, loading said movable piston with a spring force expanding said spring chamber to a maximum wherein said movable piston engages said piston wall of the piston tube, filling said cylinder tube with a damping fluid, inserting said loaded piston tube into said cylinder tube to displace the fluid contained within the latter upwardly around said piston tube until the sealing ring on said piston tube engages the upper marginal edge of the inside wall of said cylinder tube, further inserting said piston tube and sealing ring thereon within said cylinder tube a measured amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to within the latter to in turn displace the movable piston therewithin against the bias of said spring force, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 6
Dependent Claim
248 words
In a method of assembling an hydraulic damping device with a preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume spring chamber defined by a movable piston slidable within such piston tube, said piston tube further including remote from said piston wall an external sealing ring engageable with the inside wall of said cylinder tube, the steps comprising, loading said movable piston with a spring force expanding said spring chamber to a maximum wherein said movable piston engages said piston wall of the piston tube, filling said cylinder tube with a damping fluid, inserting said loaded piston tube into said cylinder tube to displace the fluid contained within the latter upwardly around said piston tube until the sealing ring on said piston tube engages the upper marginal edge of the inside wall of said cylinder tube, further inserting said piston tube and sealing ring thereon within said cylinder tube a measured amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to within the latter to in turn displace the movable piston therewithin against the bias of said spring force, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 7
Dependent Claim
277 words
In a method of assembling an hydraulic damping device with a pneumatic preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube having an inside sealing wall and open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume gas chamber defined by a movable piston slidable within such piston tube, said piston tube further including remote from said piston wall an external sealing ring engageable with said inside sealing wall of said cylinder tube, the steps comprising, loading said movable piston with gas at a predetermined pressure expanding said chamber to a maximum wherein said movable piston engages said piston wall of the piston tube, filling said cylinder tube with a quantity of damping fluid measured to attain a level substantially at the upper marginal edge of said inside sealing wall upon completion of the next recited step, inserting said loaded piston tube into said cylinder tube to displace the fluid contained within the latter upwardly around said piston tube until the sealing ring on said piston tube engages the upper marginal edge of said inside sealing wall of said cylinder tube, further inserting said piston tube and sealing ring thereon within said cylinder tube a measured amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to in turn displace the movable piston therewithin and further pressurize said gas, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 8
Dependent Claim
277 words
In a method of assembling an hydraulic damping device with a pneumatic preload and a reserve quantity of hydraulic damping fluid, said device being of the type including a cylinder tube having an inside sealing wall and open at one end to receive a piston tube having a control orificed inner end piston wall and a variable volume gas chamber defined by a movable piston slidable within such piston tube, said piston tube further including remote from said piston wall an external sealing ring engageable with said inside sealing wall of said cylinder tube, the steps comprising, loading said movable piston with gas at a predetermined pressure expanding said chamber to a maximum wherein said movable piston engages said piston wall of the piston tube, filling said cylinder tube with a quantity of damping fluid measured to attain a level substantially at the upper marginal edge of said inside sealing wall upon completion of the next recited step, inserting said loaded piston tube into said cylinder tube to displace the fluid contained within the latter upwardly around said piston tube until the sealing ring on said piston tube engages the upper marginal edge of said inside sealing wall of said cylinder tube, further inserting said piston tube and sealing ring thereon within said cylinder tube a measured amount whereby a correlative quantity of fluid is displaced through the control orifice of the piston wall of said piston tube to in turn displace the movable piston therewithin and further pressurize said gas, and providing a one-way limit stop on said cylinder tube engaging said piston tube to hold said piston tube against retrogression from said further inserted condition.
Claim 9
Dependent Claim
23 words
The method of claim 4 in which the last-named step is accomplished by crimping the marginal open end portion of said cylinder tube.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |