Lightweight collapsible woodburning stove

• US 5,119,799 A
• Filed: 04/15/1991
• Issued: 06/09/1992
• Est. Priority Date: 04/15/1991
• Status: Expired due to Fees

• Current Assignee: Michael F. Cowan
• Original Assignee: Michael F. Cowan
• Inventors: Cowan, Michael F.
• Primary Examiner(s): Dority, Carroll B.
• Application Number:
  US07/684,857
• Time in Patent Office: 421 Days
• Field of Search: 126/9 R, 126/65, 126/58, 126/59
• US Class Current: 126/9.00R
• CPC Class Codes: F24B 1/022 easily collapsible or easily removable
• CPC Class Codes: F24B 1/205 collapsible
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

This invention is a small, very lightweight, fuel efficient, collapsible woodburning stove comprising six parts that form a combustion chamber, and four supporting legs, all fabricated from thin sheet metal by cutting or die-stamping, and all held together as a fully functional unit solely and entirely by a system of flanges produced by bending peripheral edges of the six parts and four supporting legs, and by four easily installed and removed pin-spring-chain assemblies.

Claims

1. A lightweight collapsible free-standing woodburning stove that can be easily and quickly assembled or collapsed without the use of any tools whatsover is formed entirely, except for four pin-spring-chain assemblies which serve to preserve the structural integrity of the assembled stove, of simple planar parts cut or die-stamped from lightweight thin sheet metal, six of the said simple parts, namely a stove base, two stove sides, a stove front, a stove back, and a stove top, forming a fully functional box-shaped combustion chamber by means of loose fitting narrow interlocking flanges, said flanges formed by bending the vertically positioned edges of the stove sides, stove front, and stove back so that the vertically positioned edges of the stove sides interlock with the vertically positioned edges of the stove front and stove back, the interlocked stove sides, stove front, and stove back all then resting on the stove base within upward projecting flanges of the stove base, and capped by the stove top within downward projecting flanges of the stove top, said flanges of both the stove base and stove top formed by bending narrow margins of the peripheral edges of the stove base and stove top 90 degrees to the planar surfaces of the stove base and stove top, said combustion chamber thus formed as above then maintained in its structural integrity together with four supporting legs by means of four pin-spring-chain assemblies, the pin of each pin-spring-chain assembly holding each leg in place on the stove bottom, the spring of each pin-spring-chain assembly extended in tension between each pin and each chain connected to the stove top at positions near the stove top corners, so that the stove base and stove top are held securely against the bottom and top edges respectively of the stove sides, stove front, and stove back.

2. The legs for a stove as defined in claim 1, each leg formed by cutting or die-stamping lightweight thin sheet metal to a planar form in which two separate adjacent top flanges are formed by bending a narrow margin at the top edge of the form 180 degrees, then bending the said planar form along a central vertical axis so that each half of the bent planar form meets the other half at 90 degrees along the bend axis, forming a very lightweight and structurally competent stove leg, said stove leg having two holes either punched or drilled on each side of the bend axis at points just below the edges of the flanges so that with the stove leg placed at the corner of the stove base of the stove defined in claim 1, with the flanges of the stove leg fitted over the peripheral upward projecting flanges of the said stove base at the stove base corner, a pin is inserted through one of the holes in the stove leg, under the edge of the stove base in contact or near contact with the stove base, and out through the other hole, thus locking the stove leg to the stove base, the said pin not only locking the stove leg to the stove base, but being prevented from movement, in the axial direction, from its fully inserted position, by being jammed, in opposite directions normal to its axis, upward against the bottom of the stove base corner and downward against the leg hole through which it exits, this jamming action being effected by the pin acting as a lever arm where a force is applied upward at one end by the tension spring, the stove base corner acts as a fulcrum, and the leg hole through which the pin exits acts as the other opposing force.