SAFETY DEVICE FOR GAS BURNER

• US 20190093889A1
• Filed: 09/22/2017
• Published: 03/28/2019
• Est. Priority Date: 09/22/2017
• Status: Active Grant

• Current Assignee: Rekrow Industrial Inc.
• Original Assignee: Rekrow Industrial Inc.
• Inventors: HO, TA-JEN
• Granted Patent: US 10,443,843 B2
• Time in Patent Office: Days
• CPC Class Codes: F23D 14/38 Torches, e.g. for brazing or heating nozzles F23D14/48
• CPC Class Codes: F23D 14/465 for torches F23D14/52 takes precedence
• CPC Class Codes: F23D 14/72 Safety devices, e.g. operative in case of failure of gas supply
• CPC Class Codes: F23Q 2/164 Arrangements for preventing undesired ignition

Abstract

A safety device for a gas burner includes an ignition-gas unit and a lever is pivotably connected to the installation port. The lever extends beyond a cover on the ignition-gas unit and includes a free end to which a restriction member and a spring are connected. The spring drives the restriction member toward the cover to restrict the lever from being pushed to ignite the gas burner. When the restriction member is moved, the user can push the free end downward to activate the ignition-gas unit to ignite the gas burner.

Claims

1. A safety device for a gas burner which includes a gas tube and a nozzle connected to the gas tube, the safety device comprising:

an ignition-gas unit adapted to the nozzle, a cover mounted to the ignition-gas unit, the cover having a stop on an outside thereof, a hole and an installation port which faces downward, the hole located beside the stop and communicating with the installation port, the ignition-gas unit being accommodated in the installation port;

a lever having a pivotal portion, a free end and a touch portion located between the pivotal portion and the free end, the touch portion located corresponding to the ignition-gas unit, the pivotal portion pivotably connected to the installation port, the free end extending beyond the hole;

a restriction member having an activation portion and a hook portion respectively located on two ends thereof, the activation portion located at the free end of the lever, the hook portion facing the stop, and

a spring located between the free end of the lever and the activation member of the restriction member so as to provide a force to allow the restriction member to move relative to the free end of the lever, the spring maintaining the restriction member to contact the hook portion against the stop so as to restrict the free end from being pressed downward, when the restriction member drives the spring to move the hook portion away from the free end of the lever, the free end is pushed downward and the touch portion presses the ignition-gas unit.

2. The safety device as claimed in claim 1, wherein the cover includes a restriction slot located beside the stop, when the free end is pushed downward and the touch portion presses the ignition-gas unit, the activation portion is rotated to hook the hook portion with the restriction slot.

3. The safety device as claimed in claim 2, wherein the free end of the lever includes two lugs and a pivot, the two lugs extend from the activation portion, the pivot extends through the two lugs and the activation portion.

4. The safety device as claimed in claim 3, wherein each of the two lugs and the activation portion includes a passage through which the pivot extends, the activation portion includes a toothed portion defined in an outside thereof.

5. The safety device as claimed in claim 4, wherein one of the two lugs of the lever has a recess, the activation portion has a protrusion which is movably located within the recess to restrict pivotal movement of the activation portion.

6. The safety device as claimed in claim 3, wherein the other one of the two lugs has a first slot, the activation portion has a second slot, the spring is a torsion spring which includes two distal ends which are respectively engaged with the first and second slots so as to drive the restriction member relative to the lever.

7. The safety device as claimed in claim 6, wherein a board is located between the activation portion and the hook portion, an angle less than 90 degrees is formed between the board and the hook portion.

8. The safety device as claimed in claim 2, wherein the spring is a compression spring, two ends of the spring are respectively connected to the free end of the lever and the activation portion of the restriction member, the spring normally pulls the restriction member toward the cover and the hook portion contacts the stop, so that the free end of the lever cannot be pushed downward, when the restriction member pulls the spring in a direction away from the free end linearly, the hook portion is disengaged from the stop, so that the free end of the lever is able to be pushed downward, and the touch portion pushes the ignition-gas unit.