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US3707952A Expired / Lapsed US ⏱️ 0.0 years remaining

Compression release mechanism for two stroke engines used to brake a vehicle

Assignee: Individual
•
Filing: 1970-08-20
•
Granted: 1973-01-02
•
Expires: 1990-08-20
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Abstract

Abstract A compression release mechanism is adapted for incorporation into the cylinder head combustion chamber structure of a two stroke, or two cycle, internal combustion engine to produce, when desired, a braking action to slow down a vehicle, such as a motorcycle. The compression release mechanism includes: a housing adapted to be threaded into the combustion chamber structure at a braking exhaust port provided to receive this mechanism; a braking valve positioned through the compression release housing and spring biased using a spring and its retainer to keep the braking valve in its normally closed position; an exhaust passageway network within the housing commencing at the braking exhaust port and terminating in multiple passageways, each with orifices able to discharge fluids into the atmosphere as the fluids come from the combustion chamber; valve balls used with each orifice to move clear of their seats and against their retaining structure as engine fluids flow out into the atmosphere, and to move in the opposite direction, under atmospheric and differential pressures, against their seats as outside air, generally laden with dust and dirt, attempts to enter the combustion chamber during such engine braking periods; and an enclosed cable control means adaptable to be secured at one end for pivotal actuation at a hand control location of a vehicle after its opposite end has been quickly and removably secured to the compression release mechanism by the convenient placement of its large abutment cable end in a lower restraining space, chamber, or recess in the compression release housing and immediately passing the cable, per se, respectively through aligned slots in this housing of the compression release mechanism, through the valve ball retainer and beyond through the combined valve stem retainer and valve spring retainer where the flexible control cable cover is secured, so upon control lever pivotal action, as the cable cover is caused to increase its curvature, the braking release valve is opened against the force of its return biasing spring and braking occurs.

Inventors

  • 👤 A Knebel

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 21:42
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/08; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 244 words
A compression release mechanism, for internal combustion engines, used during engine braking operations of a vehicle, comprising: a. a multiple passageway hollow housing adapted for convenient securement to an engine cylinder head over a port in a combustion chamber, having the passageways arranged parallel to and then slightly at an angle to provide the most favorable flow paths for discharging engine fluids during the engine braking; b. a compression release valve seated and slidably retained in part of the hollow housing and extending beyond it; c. a valve spring retainer secured to the extending valve portion; d. an additional valve spring retainer, serving also as a valve ball retainer, positioned on the hollow housing; e. a valve spring positioned between the valve spring retainers to retain the compression release valve in a closed position; f. valve ball means confined within the multiple passageway hollow housing to block the entry of dust, dirt and debris into an engine and to reopen the hollow housing to allow discharge of engine fluids to the atmosphere when the compression release valve is opened; and g. control means secured at least between the valve spring retainer on the extending valve portion and the hollow housing to move the valve spring retainer closer to the hollow housing against the force of the biased valve spring and thereby move the compression release valve so the engine fluids will be discharged into the atmosphere as engine braking occurs slowing down a vehicle.
Claim 2
Dependent Claim 244 words
A compression release mechanism, for internal combustion engines, used during engine braking operations of a vehicle, comprising: a. a multiple passageway hollow housing adapted for convenient securement to an engine cylinder head over a port in a combustion chamber, having the passageways arranged parallel to and then slightly at an angle to provide the most favorable flow paths for discharging engine fluids during the engine braking; b. a compression release valve seated and slidably retained in part of the hollow housing and extending beyond it; c. a valve spring retainer secured to the extending valve portion; d. an additional valve spring retainer, serving also as a valve ball retainer, positioned on the hollow housing; e. a valve spring positioned between the valve spring retainers to retain the compression release valve in a closed position; f. valve ball means confined within the multiple passageway hollow housing to block the entry of dust, dirt and debris into an engine and to reopen the hollow housing to allow discharge of engine fluids to the atmosphere when the compression release valve is opened; and g. control means secured at least between the valve spring retainer on the extending valve portion and the hollow housing to move the valve spring retainer closer to the hollow housing against the force of the biased valve spring and thereby move the compression release valve so the engine fluids will be discharged into the atmosphere as engine braking occurs slowing down a vehicle.
Claim 3
Dependent Claim 285 words
A compression release mechanism, for internal combustion engines, used during engine braking operations of a vehicle, comprising: a. a multiple passageway hollow housing Adapted for convenient securement to an engine cylinder head over a port in a combustion chamber; b. a compression release valve seated and slidably retained in part of the hollow housing and extending beyond it; c. a valve spring retainer secured to the extending valve portion; d. a valve spring positioned between the valve spring retainer and the housing and biased to retain the compression release valve in a closed position; e. valve ball means confined within the multiple passageway hollow housing to block the entry of dust, dirt and debris into an engine and to reopen the hollow housing to allow discharge of engine fluids to the atmosphere when the compression release valve is opened; and f. a control means, comprising in turn, an enclosed control cable, with its cable being movable at one end by a lever means adapted for attachment to vehicle operating controls, and being removably secured at its other end by this end being enlarged and being constrained against an abutment in the hollow housing; the cable enclosure of the control cable being secured to the vehicle operating controls and restrained at its other end in the valve spring retainer that is in turn secured to the extending valve portion, whereby the cable enclosure moves the valve against the bias spring force when the cable cover is caused to conform to a smaller radii curvature as the control cable is shortened upon movement of the lever means, and the hollow housing and valve spring retainer are slotted in line to provide unhampered movement of the control cable.
Claim 4
Dependent Claim 285 words
A compression release mechanism, for internal combustion engines, used during engine braking operations of a vehicle, comprising: a. a multiple passageway hollow housing Adapted for convenient securement to an engine cylinder head over a port in a combustion chamber; b. a compression release valve seated and slidably retained in part of the hollow housing and extending beyond it; c. a valve spring retainer secured to the extending valve portion; d. a valve spring positioned between the valve spring retainer and the housing and biased to retain the compression release valve in a closed position; e. valve ball means confined within the multiple passageway hollow housing to block the entry of dust, dirt and debris into an engine and to reopen the hollow housing to allow discharge of engine fluids to the atmosphere when the compression release valve is opened; and f. a control means, comprising in turn, an enclosed control cable, with its cable being movable at one end by a lever means adapted for attachment to vehicle operating controls, and being removably secured at its other end by this end being enlarged and being constrained against an abutment in the hollow housing; the cable enclosure of the control cable being secured to the vehicle operating controls and restrained at its other end in the valve spring retainer that is in turn secured to the extending valve portion, whereby the cable enclosure moves the valve against the bias spring force when the cable cover is caused to conform to a smaller radii curvature as the control cable is shortened upon movement of the lever means, and the hollow housing and valve spring retainer are slotted in line to provide unhampered movement of the control cable.
Claim 5
Dependent Claim 49 words
A compression release mechanism, as claimed in claim 2, having a valve ball retainer positioned on the hollow housing and then serving also as an additional valve spring retainer at opposite end of the spring and having an in line slot to provide unhampered movement of the control cable.

References Cited (Backward Citations)

GB134657A Cited
US1047499A Cited
FR414688A Cited
GB191226931A Cited
US1691953A Cited
GB371519A Cited
AT178228B Cited
FR1017913A Cited
DE1010320B Cited
GB106561A Cited
US3667435A Cited
US3638632A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-01-02 1976-07-03 1977-01-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-01-02 1980-07-03 1981-01-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-01-02 1984-07-03 1985-01-02 $7700.00 Window Closed / Lapsed

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