Patent US4870314A successfully refreshed from Google Patents.
US4870314A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cam-actuated piezoelectric ignition device for gas appliance
Assignee: MASTER CRAFT BOAT Co (TN CORPORATION)
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Filing: 1987-11-23
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Granted: 1989-09-26
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Expires: 2007-11-23
Abstract
Abstract A gas appliance such as a propane lantern is provided with a piezoelectric ignition device which is operated by the on-off control knob of the appliance. The piezoelectric ignition device is actuated by a pushbutton. The control knob includes a cam which causes movement of the pushbutton as the control knob rotates.
Inventors
- 👤 Dennis V. Hefling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:11
CPC Classifications
F; F23; F23Q; F23Q3/00; F23Q3/002
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A control knob and ignition assembly for a gas appliance having a frame, a gas burner mounted on the frame, and a gas valve mounted on the frame for supplying gas to the burner, the control knob and ignition assembly comprising: a control knob rotatably mounted on the gas valve for opening and closing the valve, a piezoelectric ignition assembly mounted on the frame and including a housing, a piezoelectric crystal within the housing, and a pushbutton slidably mounted on the housing for movement in a direction which extends parallel to the axis of rotation of the control knob, and cam means on the control knob for moving the push button as the control knob rotates.
Claim 2
Dependent Claim
116 words
A control knob and ignition assembly for a gas appliance having a frame, a gas burner mounted on the frame, and a gas valve mounted on the frame for supplying gas to the burner, the control knob and ignition assembly comprising: a control knob rotatably mounted on the gas valve for opening and closing the valve, a piezoelectric ignition assembly mounted on the frame and including a housing, a piezoelectric crystal within the housing, and a pushbutton slidably mounted on the housing for movement in a direction which extends parallel to the axis of rotation of the control knob, and cam means on the control knob for moving the push button as the control knob rotates.
Claim 3
Dependent Claim
24 words
The structure of claim 1 in which the cam means includes a camming ramp on the control knob which is inclined toward the pushbutton.
Claim 4
Dependent Claim
66 words
The structure of claim 2 including a control knob housing mounted on the gas valve, the control knob being rotatable within the control knob housing, said cam means further including a camming ramp within the control knob housing and a cam engager on the control knob engageable with the camming ramp for moving the control knob along the axis of rotation as the control knob rotates.
Claim 5
Dependent Claim
65 words
The structure of claim 1 including a control knob housing mounted on the gas valve, the control knob being rotatable within the control knob housing, said cam means including a camming ramp within the control knob housing and a cam engager on the control knob engageable with the camming ramp for moving the control knob along its axis of rotation as the control knob rotates.
Claim 6
Dependent Claim
30 words
The structure of claim 4 including a cam follower slidably mounted on the frame between the pushbutton and the cam means for moving the pushbutton as the control knob rotates.
Claim 7
Dependent Claim
30 words
The structure of claim 2 including a cam follower slidably mounted on the frame between the pushbutton and the cam means for moving the pushbutton as the control knob rotates.
Claim 8
Dependent Claim
30 words
The structure of claim 1 including a cam follower slidably mounted on the frame between the pushbutton and the cam means for moving the pushbutton as the control knob rotates.
Claim 9
Dependent Claim
50 words
The structure of claim 1 in which the control knob includes a shaft portion rotatably mounted on the gas valve and a generally circular knob portion secured to the shaft and having a rim, said cam means including a camming ramp on the rim which is inclined toward the pushbutton.
Claim 10
Dependent Claim
86 words
The structure of claim 8 including a control knob housing mounted on the gas valve, the shaft portion of the control knob being rotatable within the control knob housing, said cam means further including a camming ramp within the control knob housing and a cam engager on the shaft portion of the control knob which is engageable with the camming ramp for moving the control knob along the axis of rotation as the control knob rotates along its axis of rotation as the control knob rotates.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |