US4400144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air compressor
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1981-10-03
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Granted: 1983-08-23
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Expires: 2001-10-03
Abstract
Abstract An air compressor including a motor, a motor housing, a piston assembly and a piston housing is disclosed. A bracket is located between the motor housing and the piston housing. The piston assembly includes pistons which reciprocate within sleeves upon rotation of a cam driven by the motor. The sleeves are received in U-shaped recesses in the piston housing. The open end of the U-shaped recesses are closed by the bracket. The bracket has tangs which act as springs to urge the sleeves firmly into the housing. The tangs accommodate variations in the dimensions of the housing and the sleeves, as well as provide contact with the sleeves for heat transfer.
Inventors
- 👤 Gilbert H. Drutchas
- 👤 David J. Suttkus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:56
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
106 words
A fluid compressor comprising a motor having an output shaft, a piston housing having in it at least one recess, a sleeve located in said recess, said sleeve having an axis extending transverse to said output shaft, a piston located and reciprocable in said sleeve upon rotation of said output shaft, bracket means for mounting said motor interposed between said motor and said piston housing, resilient spring means acting between said bracket means and said sleeve and applying a biasing force against said sleeve acting in a direction transverse to the axis of said sleeve and holding said sleeve in the recess in said piston housing.
Claim 2
Dependent Claim
106 words
A fluid compressor comprising a motor having an output shaft, a piston housing having in it at least one recess, a sleeve located in said recess, said sleeve having an axis extending transverse to said output shaft, a piston located and reciprocable in said sleeve upon rotation of said output shaft, bracket means for mounting said motor interposed between said motor and said piston housing, resilient spring means acting between said bracket means and said sleeve and applying a biasing force against said sleeve acting in a direction transverse to the axis of said sleeve and holding said sleeve in the recess in said piston housing.
Claim 3
Dependent Claim
41 words
A compressor as defined in claim 1 wherein said resilient spring means comprises spring tangs projecting outwardly from said bracket means and formed of the material of said bracket, said spring tangs having surface areas engaging surface areas of said sleeve.
Claim 4
Dependent Claim
73 words
A compressor as defind in claim 2 wherein the surface of the piston housing which faces the motor has an arcuate portion that at least partially defines said recess and said sleeve has an arcuate outer peripheral surface portion which engages said arcuate surface portion of the piston housing, said surface areas of said sleeve which are engaged by said spring tangs comprising flats located on the outer peripheral surface of said sleeve.
Claim 5
Dependent Claim
46 words
A compressor as defined in claim 3 wherein said flats are located equal distances on opposite sides of a plane defined by the axis of said motor output shaft and the axis of said sleeve and said flats extend at equal angles relative to said plane.
Claim 6
Dependent Claim
124 words
A compressor for fluids comprising: a motor including an output shaft rotatable about a longitudinal axis; a piston housing into which said output shaft extends, said piston housing having a surface that faces the motor and that defines a recess in said piston housing; a tubular sleeve located in the housing recess and having a longitudinal axis extending transverse to and in a common plane with the axis of said output shaft; a piston reciprocable in said sleeve; and spring means engaging an outer surface of said sleeve and pressing said sleeve into engagement with said surface that defines said recess, said spring means acting in a direction generally parallel to the axis of said output shaft and holding said sleeve in said recess.
Claim 7
Dependent Claim
124 words
A compressor for fluids comprising: a motor including an output shaft rotatable about a longitudinal axis; a piston housing into which said output shaft extends, said piston housing having a surface that faces the motor and that defines a recess in said piston housing; a tubular sleeve located in the housing recess and having a longitudinal axis extending transverse to and in a common plane with the axis of said output shaft; a piston reciprocable in said sleeve; and spring means engaging an outer surface of said sleeve and pressing said sleeve into engagement with said surface that defines said recess, said spring means acting in a direction generally parallel to the axis of said output shaft and holding said sleeve in said recess.
Claim 8
Dependent Claim
26 words
A compressor as set forth in claim 5 further including a bracket disposed between said motor and said piston housing, said bracket including said spring means.
Claim 9
Dependent Claim
45 words
A compressor as set forth in claim 6 wherein said spring means includes resilient spring tangs projecting outwardly from said bracket and formed of the material of said bracket, said spring tangs having surface areas engaging surface areas on the outer periphery of said bushing.
Claim 10
Dependent Claim
63 words
A compressor as set forth in claim 7 wherein said sleeve has an arcuate outer peripheral surface portion which throughout its length and for approximately 180 degrees about its circumference engages said surface that faces said motor, and wherein said surface areas of said sleeve which are engaged by said spring tangs comprise flats located on the outer peripheral surface of said sleeve.
Claim 11
Dependent Claim
44 words
A compressor as set forth in claims 5 or 8 wherein two sleeves are located in the piston housing and have a common axis extending transverse to the axis of said output shaft, and wherein each sleeve contains a piston reciprocable in said sleeve.
Claim 12
Dependent Claim
34 words
A compressor as set forth in claim 9 wherein said surface that defines a recess in said piston housing includes surface means for limiting axial movement of said sleeves relative to said piston housing.
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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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |