Gas combustion type driving tool

Patent metadata

Field	Value
Publication number	US-11007629-B2
Application number	US-201916251202-A
Country	US
Kind code	B2
Filing date	Jan 18, 2019
Priority date	Jan 19, 2018
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

A gas combustion type driving tool drives a fastener by combustion pressure when mixed gas of combustible gas and compressed air in a combustion chamber is ignited. The gas combustion type driving tool includes an air ejection valve, and a gas ejection valve. The air ejection valve is configured to eject compressed air into the combustion chamber. The gas ejection valve is configured to eject combustible gas into the combustion chamber. Output related to driving of a fastener is adjustable by adjusting at least one of filling pressure of compressed air or filling pressure of combustible gas.

First claim

What is claimed is:

1. A gas combustion type driving tool that drives a fastener by, combustion pressure when mixed gas of combustible gas and compressed air in a combustion chamber is ignited, the gas combustion type driving tool comprising:
an air ejection valve that is configured to eject compressed air into the combustion chamber; and
a gas ejection valve that is configured to eject combustible gas into the combustion chamber,
wherein output related to driving of a fastener is adjustable by adjusting opening time of the air ejection valve and opening time of the gas ejection valve to adjust filling pressure in the combustion chamber.

2. The gas combustion type driving tool according to claim 1 ,
wherein the opening time of the air ejection valve is adjusted by changing energizing time or an amount of electric power supplied to the air ejection valve, or
the opening time of the gas ejection valve is adjusted by changing energizing time or an amount of electric power supplied to the gas ejection valve.

3. The gas combustion type driving tool according to claim 1 ,
wherein the output is adjusted by adjusting supply pressure to at least one of the air ejection valve and the gas ejection valve.

4. The gas combustion type driving tool according to claim 3 ,
wherein supply pressure to the gas ejection valve is adjusted by changing temperature of a fuel container which is a supply source of combustible gas.

5. The gas combustion type driving tool according claim 3 ,
wherein supply pressure to the air ejection valve is adjusted by using a pressure reducing valve.

6. The gas combustion type driving tool according to claim 1 ,
wherein the output is adjusted by adjusting an opening degree of at least one of the air ejection valve and the gas ejection valve.

7. The gas combustion type driving tool according to claim 1 ,
wherein the output is adjusted by referring to an external parameter based on a sensor input or a user input.

8. The gas combustion type driving tool according to claim 7 ,
wherein the sensor includes a pressure sensor on an upstream side or a downstream side of at least one of the air ejection valve and the gas ejection valve.

9. The gas combustion type driving tool according to claim 7 ,
wherein the sensor includes a flow sensor in a flow path disposed in at least one of the air ejection valve and the gas ejection valve.

10. The gas combustion type driving tool according to claim 7 ,
wherein the sensor it includes a temperature sensor configured to detect environment temperature.

11. The gas combustion type driving tool according to claim 1 ,
wherein the output is adjusted by changing a timing of the ignition.

12. The gas combustion type driving tool according to claim 1 , further comprising:
an operation unit that is configured to adjust the output related to driving of a fastener.

13. The gas combustion type driving tool according to claim 1 , further comprising a controller which controls the opening of the air ejection valve and the gas ejection valve.

14. The gas combustion type driving tool according to claim 13 , wherein the controller controls an opening time and a closing time of each of the air ejection valve and the gas ejection valve.

Assignees

• Max Co Ltd

Inventors

• Yamamoto Yu
• Yuki Takashi
• Watanabe Eiichi
• Kimura Mitsuhiro

Classifications

• B25C1/08 Primary

  operated by combustion pressure · CPC title

• B25D9/10

  comprising a built-in internal-combustion engine · CPC title

• F01L9/10

  by fluid means, e.g. hydraulic · CPC title

• F02B63/02

  for hand-held tools · CPC title