US4259895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum motor
Assignee: Individual
•
Filing: 1979-06-11
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Granted: 1981-04-07
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Expires: 1999-06-11
Abstract
Abstract A vacuum motor includes a cylindrical housing with a mount plate at one end and an end wall at its other end terminating in a guide tube. A stem, adapted for connection to an intermittently actuated vacuum source projects into and is secured to the mount plate and is adapted for securing to a support. A cylinder is nested within the housing open at one end and at its other end is axially recessed to define with the mount plate a first vacuum chamber communicating with the stem bore. A hollow reciprocal piston open at one end is sealed within the cylinder a and terminates in a tubular piston rod which projects outwardly of the guide tube adapted for connection to a load to be moved a predetermined distance. The interior of the piston defines with the cylinder a power air chamber communicating with the piston rod and atmosphere. The piston defines with the housing end wall a second vacuum chamber which is in communication with the first vacuum chamber. A compression spring within the cylinder normally biases the piston to a retracted position.
Inventors
- 👤 Roland G. Owens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/14; F01; F01B; F01B11/00; F01B11/007; F02D; F02D11/00; F02D11/06; F02D11/08; F16; F16J; F16J10/00; F16J10/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
265 words
A vacuum motor comprising a cylindrical housing having a bore and an axially apertured mount plate at one end and an end wall at its other end terminating in an axially out-turned guide tube; an exteriorly threaded stem having an axial bore adapted for connection to an intermittenly actuated vacuum source; said stem at one end projecting through said mount plate and secured thereto, and intermediate its ends adapted for projection through a support; means adapted for securing the stem to said support; a cylinder snugly nested within said housing bore having an open end spaced from the housing end wall, the other end of said cylinder being closed and bearing against said mount plate and being axially recessed defining with said mount plate and stem a first vacuum chamber; a hollow reciprocal piston open at one end (and sealed) mounted within said cylinder, said piston terminating in an axially elongated tubular piston rod having a bore slidably extending through said guide tube and outwardly thereof adapted for connection to a load; means for sealing said piston within said cylinder; the interior of said piston defining with said cylinder and said closed other end an air power chamber communicating with the piston rod bore and with atmosphere; said piston defining with said housing end wall a second vacuum chamber; and spring means within said second vacuum chamber interposed between said housing end wall and piston normally biasing said piston into a retracted position; said housing being formed with an internal groove along its length defining with said cylinder a vacuum passage interconnecting said vacuum chambers.
Claim 2
Dependent Claim
265 words
A vacuum motor comprising a cylindrical housing having a bore and an axially apertured mount plate at one end and an end wall at its other end terminating in an axially out-turned guide tube; an exteriorly threaded stem having an axial bore adapted for connection to an intermittenly actuated vacuum source; said stem at one end projecting through said mount plate and secured thereto, and intermediate its ends adapted for projection through a support; means adapted for securing the stem to said support; a cylinder snugly nested within said housing bore having an open end spaced from the housing end wall, the other end of said cylinder being closed and bearing against said mount plate and being axially recessed defining with said mount plate and stem a first vacuum chamber; a hollow reciprocal piston open at one end (and sealed) mounted within said cylinder, said piston terminating in an axially elongated tubular piston rod having a bore slidably extending through said guide tube and outwardly thereof adapted for connection to a load; means for sealing said piston within said cylinder; the interior of said piston defining with said cylinder and said closed other end an air power chamber communicating with the piston rod bore and with atmosphere; said piston defining with said housing end wall a second vacuum chamber; and spring means within said second vacuum chamber interposed between said housing end wall and piston normally biasing said piston into a retracted position; said housing being formed with an internal groove along its length defining with said cylinder a vacuum passage interconnecting said vacuum chambers.
Claim 3
Dependent Claim
45 words
In the vacuum motor of claim 1, said housing at said one end having an outturned annular flange; said mount plate snugly bearing against said flange and having a peripheral edge portion reversed turned over and compressively engaging said flange and secured thereto throughout 360°.
Claim 4
Dependent Claim
33 words
In the vacuum motor of claim 1, the securing of said stem to said mount plate including an annular groove in said stem snugly receiving the central apertured portion of said mount plate.
Claim 5
Dependent Claim
38 words
In the vacuum motor of claim 1, said support including an apertured bracket receiving said stem; said means for securing the stem including lock nuts threaded upon said stem in operative engagement with opposite sides of said bracket.
Claim 6
Dependent Claim
16 words
In the vacuum motor of claim 1, said housing, cylinder and piston being of sheet metal.
Claim 7
Dependent Claim
27 words
In the vacuum motor of claim 1, the sealing of said piston including an annular groove in said piston; and an O-ring seal nested within said groove
Claim 8
Dependent Claim
29 words
In the vacuum motor of claim 1, the sealing of said piston including a plastic coating upon the interior of said cylinder, and a plastic coating upon said piston.
Claim 9
Dependent Claim
11 words
In the vacuum motor of claim 7, said coating being Teflon.
Claim 10
Dependent Claim
21 words
In the vacuum motor of claim 1, a felt air filter nested and retained within the bore of said piston rod.
Claim 11
Dependent Claim
42 words
In the vacuum motor of claim 9, said guide tube having an annular internal recess therein adjacent said piston rod; and an annular felt air filter nested and retained within said recess for the filtration of atmospheric air entering said vacuum chamber.
Claim 12
Dependent Claim
29 words
In the vacuum motor of claim 1, said piston having an annular shoulder of reduced diameter; said spring means being a coiled compression spring guidably received by said shoulder.
Claim 13
Dependent Claim
36 words
In the vacuum motor of claim 1, said housing having a longitudinal axis; said vacuum passage groove being eccentric to the housing axis, and at one end in communication with the open end of said cylinder.
References Cited (Backward Citations)
US1859309A
Cited
US2015374A
Cited
US2177767A
Cited
US3023739A
Cited
US3486491A
Cited
US3695149A
Cited
US4020749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |