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US 4,242,947 AGranted
Hydraulic actuator
AssigneeRenner and Lovelace, Inc.
InventorsRobert A. Renner, Ralph Lovelace
Life of this patent
Estimating the term…
Abstract
A hydraulic actuator, readily assemble and disassemble, which can be used for effecting actuation of food processing machinery or bulk bait or other commodity dispensers. Since it is necessary that such devices be safe and non-polluting, components which come in contact with the hydraulic fluid can be made of plastic so that tap water can be utilized as the hydraulic fluid. The actuator is made readily assemble and disassemble by including devices for quick and easy sealing and locking of the component parts. These devices have only a minimal number of subcomponents.
Claims15
A hydraulic actuator, comprising:
- an open ended cylinder having first and second ends and a plurality of female bayonet fitting receptacles formed circumferentially within said second end;
- a blind end plug having extension and retraction fluid transfer ports extending through its axial thickness, said blind end plug closing the first end of said cylinder;
- a retract tube having first and second ends and an axial bore through its longitudinal length, mounted at its first end within the cylinder to the blind end plug so that said axial bore communicates with the retraction fluid transfer port of the blind end plug;
- an actuator end plug having an aperture extending through its axial thickness and a plurality of radially extending male bayonet extensions formed in its circumferential surface, said extensions circumferentially disposed to correspond to locations of said female bayonet fitting receptacles formed in said cylinder, said actuator end plug closing the second end of said cylinder by insertion and locking of said male bayonet extensions in said female bayonet fitting receptacles;
- a piston, having first and second axial faces, slidably disposed within said cylinder for axial movement therein, said piston having an aperture extending through its axial thickness to accommodate said retract tube and permit relative movement therewith;
- means for preventing axial movement of said piston toward the second end of said cylinder beyond the second end of said retract tube;
- an extender tube, with first and second ends, mounted at its first end to the second axial face of said piston in encircling relation to, and spaced radially from, the retract tube, its second end extending through the aperture of said actuator end plug, said extender tube disposed for relative axial movement therewith, and said extender tube having a fluid passageway formed through the wall of said extender tube intermediate the second axial face of said piston and said actuator end plug;
- means for closing the second end of said extender tube;
- an effective work member disposed external to said cylinder for axial movement relative thereto;
- a sleeve with first and second ends, said sleeve disposed radially intermediate said cylinder and said effective work member for axial movement relative thereto;
- means for maintaining a fixed axial relationship between said sleeve and said extender tube;
- and
- cable means having first and second ends, said first ends retained at said male bayonet extensions and said second ends attached to said effective work member, said cable means extending in a first axial direction within said sleeve from said male bayonet extensions to the second end of said sleeve, and, thereafter, in a second axial direction without said sleeve to the point of attachment at said effective work member.
10 more elements
A hydraulic actuator, comprising:
- an open ended cylinder having first and second ends and a plurality of female bayonet fitting receptacles formed circumferentially within said second end;
- a blind end plug having extension and retraction fluid transfer ports extending through its axial thickness, said blind end plug closing the first end of said cylinder;
- a retract tube having first and second ends and an axial bore through its longitudinal length, mounted at its first end within the cylinder to the blind end plug so that said axial bore communicates with the retraction fluid transfer port of the blind end plug;
- an actuator end plug having an aperture extending through its axial thickness and a plurality of radially extending male bayonent extensions formed in the circumferential surface disposed to correspond to locations of said female bayonet fitting receptacles formed in said cylinder, said actuator end plug closing the second end of said cylinder by insertion and locking of said male bayonet extensions in said female bayonet fitting receptacles;
- a piston having first and second axial faces, slidably disposed within cylinder for axial movement therein, said piston having an aperture extending through its axial thickness to accommodate said retract tube and permit relative movement therewith;
- means for preventing axial movement of said piston toward the second end of said cylinder beyond the second end of said retract tube;
- an extender tube with first and second ends mounted at its first end to the second axial face of said piston in encircling relation to, and spaced radially from, the retract tube, its second end extending through the aperture of said actuator end plug and disposed for relative axial movement therewith, said extender tube having a fluid passageway formed through the wall of said extender tube intermediate the second axial face of said piston and said actuator end plug;
- means for closing the second end of said extender tube;
- a sleeve with first and second ends, said sleeve disposed in encircling relation to said cylinder for relative axial movement therewith;
- means for maintaining a fixed axial relationship between said sleeve and said extender tube;
- an effective work member disposed external to said sleeve for relative axial movement therewith;
- and
- cable means having first and second segments, said first and second segments each with first and second ends, the first end of said first segment affixed at said male bayonet extensions and the second end of said first segment at said effective work member, said first segment extending in a first axial direction within said sleeve from the point of affixation at said male bayonet extensions to the second end of said sleeve, and, thereafter, in a second axial direction without said sleeve to the point of affixation at said effective work member, and the first end of said second segment affixed at said male bayonet extensions and the second end of said second segment at said effective work member, said second segment extending in a second axial direction within said sleeve from the point of affixation at said male bayonet extensions to the first end of said sleeve, and, thereafter, in a first axial direction without said sleeve to the point of affixation at said effective work member.
10 more elements
Dependencies are inferred from the claim text.