JPH10146776A - Arm guide for contact arm in nailing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arm guide for a contact arm in a nailing machine which can be produced at a low cost. SOLUTION: In a nailing machine, a tip of a contact arm provided to be slidable in a nailing direction to a nailing machine main body is pressed to a counter member to move it relatively to the nailing machine main body to set starting operation of a trigger lever 4 effective. An arm guide 15 of synthetic resin to guide move of the contact arm is installed close to the trigger lever 4, and a bearing part 16 to bear an end part on the opposite side of the contact arm pressed side moved by being pressed to the counter member is formed in the arm guide 15, where the bearing part 16 is formed of metal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arm guide for guiding the movement of a contact arm relative to a nailing machine body when a distal end of a contact arm is pressed against a driven member on a trigger lever side.

[0002]

2. Description of the Related Art Generally, a nailing machine is activated by pulling an actuation trigger lever, but in order to prevent danger, the nailing machine is operated unless the tip of a contact arm provided on the nailing machine is pressed against the material to be driven. Not configured. The contact arm is arranged to be slidable in the nail driving direction with respect to the nailing machine main body, and when the nailing machine is directed downward, the lower end of the contact arm is arranged at the nail ejection portion, and the upper end is near the trigger lever. Are located. Normally, the lower end is spring-biased so as to protrude below the injection portion, and by pressing this portion against the material to be driven, the contact arm moves upward and the upper end makes the pulling operation of the trigger lever effective. is there.

The upper end of a contact arm is slid and guided by an arm guide. The arm guide also regulates the upper moving end of the contact arm, and is made of metal so that when the contact arm is strongly pressed against the material to be driven, its upper end is not damaged even if it hits the arm guide.

[0004]

However, since the shape of the arm guide is too complicated when it is cut out, the arm guide has a problem that the component cost is high because it is made of cast parts.

An object of the present invention is to provide an arm guide for a contact arm in a nailing machine which can solve the above problems and can be produced at low cost.

[0006]

In order to solve the above-mentioned problems, an arm guide of a contact arm in a nailing machine according to the present invention is provided with a contact slidably provided in a nail driving direction with respect to a nailing machine main body. In a nailing machine in which the tip of an arm is pressed against a material to be driven and is moved relatively to the nailing machine main body to activate the trigger lever, the movement of the contact arm is guided in the vicinity of the trigger lever. On the other hand, the arm guide made of synthetic resin is attached to the arm guide, and the arm guide is formed with a receiving portion for receiving an end opposite to the pressing side of the contact arm moved by being pressed against the material to be driven, and this receiving portion is made of metal. It is characterized by having been formed.

[0007]

FIG. 1 is a sectional view of a part of a nailing machine. This nailing machine is operated by compressed air.
Denotes a nailing machine main body, and 2 denotes a grip. A triggering valve 3 for activation, a trigger lever 4 and a contact arm 5 are arranged in the nailing machine main body 1.

The trigger valve 3 is the same as a known one. The tip of the valve stem 6 for operating the trigger valve is biased by a spring so as to protrude toward the trigger lever 4. The trigger valve 3 is actuated by pushing a valve stem 6, and the main valve 9 is opened and closed by selectively opening an air passage 7 communicating with a main valve (not shown) to an air chamber 8 storing compressed air or the atmosphere. And thereby a nail driving mechanism (not shown)
This controls the operation of.

The trigger lever 4 is rotatably supported by a support shaft 10 (provided on an arm guide 15 to be described later), and is internally provided at a position facing the valve stem 6 of the trigger valve 3. A contact lever 11 is mounted on the shaft. The trigger lever 4 is biased by a spring 12 to move away from the valve stem 6, and the contact lever 11 does not come into contact with the valve stem 6 simply by pulling the trigger lever 4.

[0010] One end 5a (lower end in the figure) of the contact arm 5 is arranged along the nail injection portion 13, and an L-shaped bracket 14 is attached to the other end (the upper end in the figure).
The inside 4 is guided by a hollow arm guide 15 so as to be vertically movable.

An arm guide 15 for guiding the movement of the contact arm 5 is mounted near the trigger lever 4. As shown in FIG. 2, FIG. 3 and FIG.
The arm guide 15 is formed in a cylindrical shape, the lower part is opened, and a space S in which the L-shaped bracket 14 of the contact arm 5 can slide in the vertical direction is formed inside.

A guide pin 16 is fixed to an opening at the upper end of the arm guide 15 with a WS pin 17. The guide pin 16 is a horizontal piece 1 of the L-shaped bracket 14 of the contact arm 5.
4a, and constitutes a receiving portion for receiving the horizontal piece 14a. A spring 18 is arranged between the lower end of the guide pin 16 and the horizontal piece 14a of the L-shaped bracket 14. The contact arm 5 is always urged by the spring 18 so as to protrude below the emitting portion. Supporting pieces 15a for supporting the trigger lever 4 are formed on both sides of the arm guide 15 so as to protrude. The vertical piece 14 b of the contact arm 5 projects upward from the side opening of the guide pin 16, and its upper end is engaged with the lower surface of the contact lever 11.

The arm guide 15 is made of a synthetic resin, and the guide pin 16 is made of a metal such as iron.

A spring receiver 19, 20 is formed at a position corresponding to the depth of the upper end of the arm guide 15 and the trigger lever 4 so that the trigger lever 4 is always kept away from the valve stem 6. A biasing spring 12 is engaged.

By pressing the lower end of the contact arm 5 against the material to be driven, the contact arm 5 moves upward against the spring 18 as shown in FIG. 5, and the L-shaped bracket 14 at the upper end moves upward. Only when the vertical lever 14b pushes up the contact lever 11 and pulls the trigger lever 4, the contact lever 11 pushes the valve stem 6 of the trigger valve 3 to activate the nailing machine.

As described above, when the contact arm 5 moves upward and its upper end is slid and guided by the arm guide 15 and reaches the top dead center, the horizontal piece 14a of the L-shaped bracket 14 above the contact arm 5 is moved to the guide pin. When the contact arm 5 is strongly pressed against the material to be driven, the upper end of the contact arm 5 strongly contacts the guide pin 16. Although large, the guide pin 16 is made of metal, so that even if the contact arm 5 is strongly pressed against the material to be driven, breakage of the arm guide 15 is effectively prevented.

Further, since the arm guide 15 can be formed from a synthetic resin, the cost of parts can be greatly reduced as compared with the conventional casting.

[Brief description of the drawings]

FIG. 1 is a sectional view of a part of a nailing machine according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of an arm guide.

FIG. 3 is an exploded perspective view of an arm guide and its peripheral parts.

FIG. 4 is a perspective view of the arm guide seen from another angle.

FIG. 5 is an explanatory view of an operation mode of a contact arm.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nailer body 3 Trigger valve 4 Trigger lever 5 Contact arm 15 Arm guide 16 Guide pin (receiving part)

Claims (1)

[Claims] The trigger lever is actuated by pressing a tip of a contact arm slidably provided in the nail driving machine body in a nail driving direction with respect to the nailed machine so as to move the contact arm relative to the nail driving machine body. In the nailing machine for enabling the operation, a synthetic resin arm guide for guiding the movement of the contact arm is attached near the trigger lever, while the arm guide is moved by being pressed against the material to be driven. An arm guide for a contact arm in a nailing machine, wherein a receiving portion for receiving an end opposite to a pressing side of the contact arm is formed, and the receiving portion is formed of metal.