US3604402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piston mechanism
Assignee: Motorenfabrik Hatz GmbH and Co KG
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Filing: 1969-08-21
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Granted: 1971-09-14
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Expires: 1989-08-21
Abstract
Abstract A piston mechanism having preferably one or two pairs of opposed cylinders with reciprocating pistons therein. A shaft located between the pistons includes diametrically opposed cams thereon for directly and drivingly engaging the pistons. Springs urge the pistons against the cam parts and the spring can also operate a scavage air feeder. Valves can be operated by further cams mounted on the shaft.
Inventors
- 👤 Ernst Hatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:45
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/222; F01; F01B; F01B9/00; F01B9/04; F01B9/06; F01B2009/061; F01B2009/065; F02B75/02; F02B2075/022; F02B2075/025; F02B2075/1804; F02B2075/1816; F02B3/00; F02B3/06; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18296
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
A piston mechanism comprising at least one pair of diametrically opposed cylinders, a reciprocating piston in each cylinder, a shaft located between said pistons, and driving means for placing said pistons and said shaft into driving relationship with each other, said driving means comprising at least one pair of cam parts mounted on diametrically opposite sides of the axis of the said shaft for rotation with said shaft, said cam parts being engageable with said pistons such that the driving force between the piStons and the shaft is transmitted through contact between said cam parts and said pistons in a direction generally parallel to the direction of movement of the pistons and including resilient means having a movable part, said resilient means continuously acting on the pistons for urging the pistons against the cam parts, wherein said piston mechanism is a twostroke internal combustion engine including pumping means for pumping scavanging air to said cylinders, the last said means being operated by said resilient means as the movable of said resilient means moves with the pistons during the reciprocation of the pistons.
Claim 2
Dependent Claim
182 words
A piston mechanism comprising at least one pair of diametrically opposed cylinders, a reciprocating piston in each cylinder, a shaft located between said pistons, and driving means for placing said pistons and said shaft into driving relationship with each other, said driving means comprising at least one pair of cam parts mounted on diametrically opposite sides of the axis of the said shaft for rotation with said shaft, said cam parts being engageable with said pistons such that the driving force between the piStons and the shaft is transmitted through contact between said cam parts and said pistons in a direction generally parallel to the direction of movement of the pistons and including resilient means having a movable part, said resilient means continuously acting on the pistons for urging the pistons against the cam parts, wherein said piston mechanism is a twostroke internal combustion engine including pumping means for pumping scavanging air to said cylinders, the last said means being operated by said resilient means as the movable of said resilient means moves with the pistons during the reciprocation of the pistons.
Claim 3
Dependent Claim
32 words
A piston mechanism according to clam 1 wherein the cam parts are nonpositively connected to said pistons such that the pistons and the cam parts can be moved independently of each other.
Claim 4
Dependent Claim
32 words
A piston mechanism according to clam 1 wherein the cam parts are nonpositively connected to said pistons such that the pistons and the cam parts can be moved independently of each other.
Claim 5
Dependent Claim
22 words
A piston mechanism according to claim 1 wherein the cam parts engage the pistons directly such that said contact is sliding contact.
Claim 6
Dependent Claim
30 words
A piston mechanism according to claim 1 wherein the pistons include rolling elements reciprocating therewith and wherein the cam parts engine the rolling elements whereby said contact is rolling contact.
Claim 7
Dependent Claim
21 words
A piston mechanism according to claim 1 including guide means for preventing rotary movement of each piston within its respective cylinder.
Claim 8
Dependent Claim
30 words
A piston mechanism according to claim 1 including further cams mounted on said shaft for rotation therewith for controlling the flow of fluids in said mechanism relative to said cylinders.
Claim 9
Dependent Claim
32 words
A piston mechanism according to claim 6 including control valves for controlling the flow of fluids into and out of said cylinders, movement of said valves being controlled by said further cams.
Claim 10
Dependent Claim
75 words
A piston mechanism according to claim 1, wherein said resilient means comprises at least one spring member having its central part located between the pistons and having one opposite end engaging each of the opposed pistons to urge the same in the direction towards the cam part, the movable part of said spring member reciprocating with said pistons operably engaging a movable part of said pumping means to feed said scavanging air into the cylinders.
Claim 11
Dependent Claim
43 words
A piston mechanism according to claim 8, said movable part of said pumping means being a diaphragm, wherein when the pistons move toward said shaft the diaphragm is moved by said spring member to cause scavanging air to be fed into the cylinders.
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |