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US 4,106,412 AGranted
Fluid truck bolster snubber
AssigneeHalliburton Company
InventorsRichard C. Farris, William S. Butler
Life of this patent
Estimating the term…
Abstract
A piston and cylinder motion dampening device having spiral groove metering, an orificed two-way pressure relief valve or a screw-on spring or an over-extension limiting seal retainer. A push-together method of assembling a piston and cylinder motion dampening device. A motion dampening device with a baffle chamber.
Claims40
In a motion damping apparatus, the improvement comprising:
- a movable piston;
- cylinder means, for sealingly surrounding at least a portion of said piston;
- said cylinder means including end cap means for closing a first end, a second open end axially opposite to said first end, and an internal surface therebetween;
- a high pressure chamber between said closed end of said cylinder means and said piston;
- a reservoir on an opposite side of said piston from said high pressure chamber;
- two-way valve means, in said piston, for allowing relatively unrestricted flow from said reservoir into said high pressure chamber through said piston in response to a slightly lower pressure in said high pressure chamber than in said reservoir and for allowing relatively restricted flow from said high pressure chamber into said reservoir in response to a much higher pressure in said high pressure chamber than in said reservoir;
- spiral groove means, disposed between said piston and said cylinder means, for allowing regulated flow bypassing said piston within said cylinder means;
- and
- fixed diameter orifice means between said high pressure chamber and said reservoir for allowing regulated flow between said high pressure chamber and said reservoir.
6 more elements
A single acting motion dampening device, comprising:
- cylinder means for defining a high pressure chamber therein;
- piston means, movable within said cylinder means, for alternately contracting and expanding said high pressure chamber in response to forces applied to said piston means;
- spiral groove means, disposed between said piston means and said cylinder means, for allowing regulated flow bypassing said piston means within said cylinder means;
- reservoir means, connected to said high pressure chamber by a fluid passageway, for receiving fluid from said high pressure chamber during contraction thereof and supplying fluid to said high pressure chamber during expansion thereof;
- valve means in said fluid passageway for regulating fluid flow therethrough, said valve means including:
- a valve member disposed in said fluid passageway;
- first passageway means through said valve member, for allowing flow from said high pressure chamber to said reservoir;
- second passageway means, through said valve member, for allowing flow from said reservoir to said high pressure chamber, said second passageway means having much greater flow capacity than said first passageway means;
- first closure means, within said first passageway means, for opening said first passageway means only in response to pressure in said high pressure chamber exceeding the pressure in said reservoir by a first predetermined magnitude and for closing said first passageway means at all lower pressures;
- second closure means, within said second passageway means, for opening said second passageway means in response to pressures in said reservoir exceeding the pressure in said high pressure chamber by a second predetermined magnitude, said first magnitude being much greater than said second magnitude;
- and
- third passageway means, in said valve member, for allowing restricted flow from said high pressure chamber to said reservoir.
9 more elements
A shock absorber, comprising:
- a piston;
- cylinder means surrounding said piston, defining a working chamber between said piston and one end of said cylinder means and having a recess therein at the other end of said cylinder means;
- seal means, between said piston and cylinder, for isolating said working chamber;
- said seal means installed in the recess at the other end of said cylinder means;
- dust cover means, connected to said piston, for reducing the amount of dust contacting said seal means during operation of the shock absorber in a dusty environment;
- said dust cover means comprising:
- a thin tubular piece of material having a flange at one end thereof while the other end is secured to said piston;
- and
- retainer means, attached to said cylinder, for interlocking with the flange of said dust cover to prevent over-extension of the shock absorber, and for maintaining said seal means in said operative position in the recess at the other end of said cylinder means.
6 more elements
A fluid shock absorber, comprising:
- a piston;
- cylinder means surrounding a portion of said piston, defining working chamber between said piston and one end of said cylinder means and having a recess therein at the other end of said cylinder means;
- seal means, for isolating said working chamber;
- said seal means installed in the recess at the other end of said cylinder means;
- retainer means, attached to a portion of said cylinder, for retaining said seal means in an operative position;
- and
- limit means, attached to said piston, for abutting said retainer means to prevent over-extension of said piston relative to said cylinder, said limit means having a greater internal diameter than the external diameter of said portion of said cylinder.
4 more elements
A shock absorber comprising:
- a cylinder including:
- a cylinder wall having inner and outer peripheral surfaces and one open end;
- a piston telescopically received within said cylinder, said piston having a high pressure face in engagement with a body of fluid and a low pressure face;
- spiral groove means, disposed on the inner peripheral surface of said cylinder wall for allowing regulated fluid flow bypassing said piston within said cylinder;
- passage means, associated with said piston, for providing fluid communication between said high and low pressure faces of said piston, said passage means comprising:
- valve means for allowing relatively restricted fluid flow from the high pressure face to the low pressure face of said piston;
- and
- fixed diameter orifice means between the high pressure face and low pressure face of said piston for allowing regulated fluid flow between the high pressure face and low pressure face of said piston;
- a reservoir in fluid communication with said low pressure face and intended to receive fluid which passes from the high pressure face of said piston through said passage means;
- return flow valve means, associated with said piston and adjacent said passage means, for increasing and decreasing fluid flow through at least part of said passage means during motion of said piston away from and toward body of fluid respectively;
- and
- baffle means, attached to said piston, for baffling fluid flow entering said reservoir from at least part of said passage means during motion of said piston toward said body of fluid.
9 more elements
Dependencies are inferred from the claim text.