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US5062791A Expired / Lapsed US ⏱️ 0.0 years remaining

Gas blowtorch

Assignee: Individual
•
Filing: 1991-04-01
•
Granted: 1991-11-05
•
Expires: 2011-04-01
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Abstract

Abstract A blowtorch includes a replaceable gas cylinder and a hollow base having an opening to slidingly receive a lower portion of the gas cylinder. A torch head is mounted horizontally on one end of a tubular support rod extending perpendicular to and upward from the first plate. The torch head has a gas outlet formed on a front end, a gas regulator provided on a rear end to control gas flow through the gas outlet, and a downwardly extending gas inlet engaging the gas cylinder to permit controlled release of gas contained in the gas cylinder through the gas outlet. A protective cover assembly is longer than and is detachably fitted over the torch head. A spark igniter is mounted on the torch head. A control device generates a high voltage output to trigger the spark igniter to produce a spark. Gas released at the gas outlet mixes with air to form a combustible mixture. The spark produced by the spark igniter ignites the combustible mixture to produce a flame output.

Inventors

  • 👤 Charg-Shing Liou

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 09:48
CPC Classifications
F; F23; F23D; F23D14/00; F23D14/28; F23D14/38

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 245 words
A blowtorch, comprising: a replaceable gas cylinder; a base including a hollow body having an open top end and defining a hollow space, and a first plate covering said open top end and having an opening to slidingly receive a lower portion of said gas cylinder; a tubular support rod extending perpendicular to and upward from a portion of said first plate which is spaced from said opening; a torch head mounted horizontally on a distal end of said tubular support rod, said torch head having a front end, a rear end, a gas outlet formed on said front end, a gas regulating means provided on said rear end to control gas flow through said gas outlet, and a downwardly extending gas inlet means engaging said gas cylinder to permit controlled release of gas contained in said gas cylinder through said gas outlet; a protective cover assembly longer than and detachably fitted over said torch head, said protective cover assembly including a pair of elongated casing halves, which casing halves are hinged together on one side, and releasably secured to one another on the other side; a spark igniter means mounted on said torch head; and means for generating a high voltage output to trigger said spark igniter means to produce a spark; whereby, gas released at said gas outlet mixes with air to form a combustible mixture, said spark produced by said spark igniter means ignites the combustible mixture to produce a flame output.
Claim 2
Dependent Claim 245 words
A blowtorch, comprising: a replaceable gas cylinder; a base including a hollow body having an open top end and defining a hollow space, and a first plate covering said open top end and having an opening to slidingly receive a lower portion of said gas cylinder; a tubular support rod extending perpendicular to and upward from a portion of said first plate which is spaced from said opening; a torch head mounted horizontally on a distal end of said tubular support rod, said torch head having a front end, a rear end, a gas outlet formed on said front end, a gas regulating means provided on said rear end to control gas flow through said gas outlet, and a downwardly extending gas inlet means engaging said gas cylinder to permit controlled release of gas contained in said gas cylinder through said gas outlet; a protective cover assembly longer than and detachably fitted over said torch head, said protective cover assembly including a pair of elongated casing halves, which casing halves are hinged together on one side, and releasably secured to one another on the other side; a spark igniter means mounted on said torch head; and means for generating a high voltage output to trigger said spark igniter means to produce a spark; whereby, gas released at said gas outlet mixes with air to form a combustible mixture, said spark produced by said spark igniter means ignites the combustible mixture to produce a flame output.
Claim 3
Dependent Claim 52 words
The blowtorch as claimed in claim 1, wherein said high voltage generating means comprises: a cell means having a low voltage output; a voltage transforming means to transform said low voltage output to said high voltage output; and a switching means to selectively connect said cell means and said voltage transforming means.
Claim 4
Dependent Claim 101 words
The blowtorch as claimed in claim 2, wherein said protective cover assembly is made of metal, and said spark igniter means comprises: an elongated ceramic insulator mounted on said torch head and extending from said front end to said rear end of said torch head; and an electrode extending axially through said ceramic insulator and having one end disposed adjacent to said gas outlet and the other end electrically connected to said voltage transforming means to receive said high voltage output, said one end of said electrode being spaced from one of said casing halves to cooperatively form a spark gap.
Claim 5
Dependent Claim 81 words
The blowtorch as claimed in claim 1, wherein said base further comprises: a second plate projecting inward from said hollow body and into said hollow space, said second plate being vertically spaced from said first plate and being aligned with said opening; a third plate disposed inside said hollow space between said opening and said second plate, said gas cylinder having a bottom end resting on said third plate; and a spring biasing said third plate away from said second plate.
Claim 6
Dependent Claim 32 words
The blowtorch as claimed in claim 1, wherein said first plate has an outer surface and an inner surface, said opening being gradually tapered from said outer surface to said inner surface.
Claim 7
Dependent Claim 40 words
The blowtorch as claimed in claim 1, wherein said other side of each said casing half cooperatively form an elongated crevice, said torch head further having an elongated plate blocking said elongated crevice to prevent gas flow through said crevice.

References Cited (Backward Citations)

US1763289A Cited
US2666480A Cited
FR1127635A Cited
US4553927A Cited
US4597732A Cited
US4938686A Cited
US4720259A Cited
US4952138A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-11-04 1995-05-06 1995-11-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-11-04 1999-05-06 1999-11-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-11-04 2003-05-06 2003-11-05 $7700.00 Window Closed / Lapsed

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