Two-switch device for an electric nail gun

Patent metadata

Field	Value
Publication number	US-9238298-B2
Application number	US-201113287108-A
Country	US
Kind code	B2
Filing date	Nov 1, 2011
Priority date	Nov 3, 2010
Publication date	Jan 19, 2016
Grant date	Jan 19, 2016

Abstract

A two-switch device is used for an electric nail gun. The electric nail gun includes a safety member movable to press against an article to thereby move in the gun body, a kinetic power unit for generating kinetic energy, an impact unit for outputting kinetic energy to perform a nail-striking operation, and a transmission unit for transmitting the kinetic energy. The two-switch device includes a first electrical control unit controlled by a trigger and the safety member for driving the kinetic power unit, and a second electrical control unit controlled by an inner plate for driving the transmission unit. By controlling actuation order of the safety member and the trigger, the electric nail gun can be changed between a single shot mode and a continuous shooting mode.

First claim

We claim:

1. An electric nail gun adapted for driving a nail into an article, comprising a gun body, a safety member movable to press against the article to thereby move in the gun body, a kinetic power unit disposed in the gun body for generating kinetic energy, an impact unit for outputting kinetic energy to perform a nail-striking operation, a transmission unit for transmitting the kinetic energy from the kinetic power unit to the impact unit, and a two-switch device including:
a trigger unit including a trigger adapted to be disposed pivotally on the gun body, and an inner plate disposed pivotally on said trigger such that, when said safety member is pressed against the article to move in the gun body, said inner plate is driven by said safety member to move in the gun body, said inner plate being connected to said safety member in such a manner that, when in a single shot mode, a nail-striking operation results in removal of said inner plate from said safety member, and when in a continuous shooting mode, the nail-striking operation does not result in removal of said inner plate from said safety member;
a first electrical control unit adapted to be disposed in the gun body, said first electrical control unit being contactable with both of said trigger and said safety member, and outputting a first electrical control signal for driving electrically said kinetic power unit upon being contacted by one of said trigger and said safety member, whichever is first operated; and
a second electrical control unit adapted to be disposed in the gun body, said second electrical control unit being contactable with said inner plate so as to output a second electrical control signal for driving electrically said transmission unit;
wherein said first electrical control unit includes a contact switch and a touch member movable relative to said contact switch and having a contact portion, and two protrusions contactable respectively with and movable by said safety member and said trigger to allow said contact portion to move into contact with said contact switch to output the first electrical control signal;
wherein, in the single shot mode, (i) said inner plate is set in a lower point position relative to said trigger, (ii) the safety member is pressed against the article to contact said first electrical control unit so as to generate the first electrical control signal for driving electrically said kinetic power unit, and (iii) said trigger is depressed to move said inner plate to contact said second electrical control unit so as to generate the second electrical control signal for driving electrically said transmission unit; and
wherein, in the continuous shooting mode, (i) said inner plate is set in a high point position relative to said trigger, (ii) said trigger is depressed to contact said first electrical control unit so as to generate the first electrical control signal for driving electrically said kinetic power unit, and (iii) the safety member is pressed against the article to move said inner plate to contact said second electrical control unit so as to generate the second electrical control signal for driving electrically said transmission unit.

2. The electric nail gun as claimed in claim 1 , wherein said trigger has an abutment surface that faces toward said first electrical control unit and that is rotatable to contact one of said two protrusions of said touch member of said first electrical control unit to allow the first electrical control signal to be output from said contact switch of said first electrical control unit.

3. The electric nail gun as claimed in claim 1 , wherein said first electrical control unit further includes a mounting member disposed between said safety member and said contact switch and permitting said touch member to be disposed movably therein, and a resilient member disposed between said mounting member and said touch member for biasing said touch member away from said contact switch.

4. The electric nail gun as claimed in claim 1 , wherein said safety member has an abutting portion at an end thereof, said abutting portion being movable into contact with a corresponding one of said protrusions of said touch member.

5. The electric nail gun as claimed in claim 1 , wherein said inner plate has a lower end, and said trigger unit includes a rotating member disposed pivotally on said trigger and provided with an eccentric pin connected pivotally to said lower end of said inner plate, such that said rotating member can be rotated to move said inner plate relative to said safety member between the high and lower point positions.

6. The electric nail gun as claimed in claim 1 , wherein said second electrical control unit includes a contact switch and a touch member movable relative to said contact switch, said touch member having a contact portion and a protrusion contactable with and movable by said inner plate to allow said contact portion to move into contact with said contact switch.

7. The electric nail gun as claimed in claim 6 , wherein said second electrical control unit further includes a mounting member disposed between said inner plate and said contact switch and permitting said touch member to be disposed movably therein, and a resilient member disposed between said mounting member and said touch member for biasing said touch member away from said contact switch.

8. The electric nail gun as claimed in claim 1 , wherein said safety member has an end that is formed with a notch and that is movable to contact said inner plate in such a manner that said inner plate engages said notch, thereby pushing said inner plate into contact with said second electrical control unit when said safety member is pressed against the article.

Assignees

• Wu Jian-Rung
• Po Chien-Kuo
• Basso Ind Corp

Inventors

• Wu Jian-Rung
• Po Chien-Kuo

Classifications

• B25C1/06

  operated by electric power · CPC title

• B25C1/008 Primary

  Safety devices · CPC title