US3726185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressed-air pump
Assignee: Electrolux AB
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Filing: 1971-03-15
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Granted: 1973-04-10
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Expires: 1991-03-15
Abstract
Abstract This invention relates to a compressed-air pump which has a compressed-air motor and operates with compressed air and has a cylinder and a cooperating block or head therefor. A piston moves forward and backward in the cylinder space. The supply of compressed air to the motor is controlled by a valve movable between first and second positions in a bore of the block. The block is formed with passageways for supplying compressed air to the piston when it is in one position in the cylinder space and the valve body is in its first position, and for terminating such supply of compressed air when the valve body moves to its second position responsive to the supply of compressed air. In the second position of the valve body communication is established between the cylinder space and the atmosphere. In order to reduce malfunction of the compressed-air motor all of the compressed air supply passageways are formed in the block and the valve body is characterized by the absence of passageways.
Inventors
- 👤 B Orr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:19
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/12; F04B9/123; F04B9/127; F01; F01B; F01B17/00; F01B17/02; F01L; F01L23/00; F01L25/00; F01L25/02; F01L25/04; F01L25/06; F01L25/066; F04B53/00; F04B53/10; F04B53/1002
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
277 words
In a compressed-air pump, a. a compressed-air motor comprising a cylinder having a space and a block serving as a head therefor, said block having a bore, b. a piston for said cylinder which is movable forward and backward in the space, c. valve means comprising a valve body movable in said bore between first and second positions, d. structure including passageways only in said block for supplying compressed air from a source of supply to the piston of said motor in the first position of said valve body and for establishing communication between the cylinder space and atmosphere in the second position of said valve body, e. said structure being so constructed and arranged that compressed air is supplied to said piston when it is in one position in the cylinder space and said valve body is in its first position and such supply of compressed air to said piston through said passageways ceases when said valve body is in its second position, f. said valve body, responsive to compressed air supplied to said motor when said body is in its first position, being movable therefrom to its second position, and g. said valve body comprising a rod having an intermediate portion and a first end portion removed from said piston and a second end portion nearer to said piston than said first end portion, said first end portion including resilient means in sealing engagement with said bore and said second end portion being solid and in sliding engagement with at least a part of said bore and said intermediate portion having a smaller crosssectional area than that part of said bore with which it coextends.
Claim 2
Dependent Claim
277 words
In a compressed-air pump, a. a compressed-air motor comprising a cylinder having a space and a block serving as a head therefor, said block having a bore, b. a piston for said cylinder which is movable forward and backward in the space, c. valve means comprising a valve body movable in said bore between first and second positions, d. structure including passageways only in said block for supplying compressed air from a source of supply to the piston of said motor in the first position of said valve body and for establishing communication between the cylinder space and atmosphere in the second position of said valve body, e. said structure being so constructed and arranged that compressed air is supplied to said piston when it is in one position in the cylinder space and said valve body is in its first position and such supply of compressed air to said piston through said passageways ceases when said valve body is in its second position, f. said valve body, responsive to compressed air supplied to said motor when said body is in its first position, being movable therefrom to its second position, and g. said valve body comprising a rod having an intermediate portion and a first end portion removed from said piston and a second end portion nearer to said piston than said first end portion, said first end portion including resilient means in sealing engagement with said bore and said second end portion being solid and in sliding engagement with at least a part of said bore and said intermediate portion having a smaller crosssectional area than that part of said bore with which it coextends.
Claim 3
Dependent Claim
71 words
Apparatus as set forth in claim 1 in which said block has a first passageway forming a part of said structure which, in the first position of said valve body, serves to supply compressed air from the source of supply directly into said cylinder, said block also having a second passageway establishing communication between that portion of said bore occupied by the intermediate portion of said valve body and the atmosphere.
Claim 4
Dependent Claim
49 words
Apparatus as set forth in claim 1 in which said second end portion of said valve body has a flat surface and said block has a cooperating flat surface at said bore which serves as a seat for the flat surface of said valve body in its first position.
Claim 5
Dependent Claim
72 words
Apparatus as set forth in claim 1 in which said passageways include at least one cavity in said block at a region thereof nearest to said piston, and said one cavity forming at least a part of said passageway which establishes communication between the cylinder space and the atmosphere and includes that part of said bore coextensive with the intermediate portion of said valve body when it is in its second position.
Claim 6
Dependent Claim
66 words
Apparatus as set forth in claim 4 in which said structure is so constructed and arranged that the second end portion of said valve body, during its movement from its first to its second positions, initially reduces the supply of compressed air to said piston and subsequently functions to establish communication between said cylinder space and the atmosphere through said passageway which includes said one cavity.
Claim 7
Dependent Claim
49 words
Apparatus as set forth in claim 5 in which said one cavity is disposed in said block at tHe portion of said bore in which the intermediate portion of said valve body is disposed, said block having a passageway extending from said one cavity to an exterior surface thereof.
Claim 8
Dependent Claim
51 words
Apparatus as set forth in claim 5 in which the second end portion of said valve body, during its movement from its first to its second positions, initially shuts off the supply of compressed air to said piston and thereafter functions to establish communication between said cylinder space and the atmosphere.
Claim 9
Dependent Claim
69 words
Apparatus as set forth in claim 1 in which the second end portion of said valve body includes a conical-shaped end section and a thrust head which is fixed to and carried by said end section and faces said piston, said conical-shaped end section functioning to guide compressed air supplied to said motor through at least one passageway in said block in the first position of said valve body.
Claim 10
Dependent Claim
38 words
Apparatus as set forth in claim 8 in which said conical-shaped end section deflects compressed air from said one passageway toward said piston in a direction substantially parallel to its forward and backward movement in said cylinder space.
Claim 11
Dependent Claim
19 words
Apparatus as set forth in claim 1 in which said resilient means and said valve body comprise plastic material.
Claim 12
Dependent Claim
37 words
Apparatus as set forth in claim 10 in which said resilient means includes a conical-shaped collar in sealing engagement with said bore and an integrally formed hollow bushing fixed to the first end portion of said rod.
Claim 13
Dependent Claim
48 words
Apparatus as set forth in claim 11 in which the first end portion of said rod is formed with ridges at its periphery which are axially spaced from one another, and said hollow bushing of said resilient means being anchored on said rod between said axially spaced ridges.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |