JPH0753907Y2 - Nailer safety device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nailing machine safety device provided with a contact member for detecting a driven material which is arranged near the lower end of the nose portion of the nailing machine.

[0002]

2. Description of the Related Art A building material (fixing metal fitting, etc.) in which a hole for inserting a nail shaft is previously formed is nailed to another member to join the two members together. There is.
In this case, in order to correctly position the lower end of the nail shaft with respect to the hole of the building material and quickly drive it in, the leading nail of the connecting nail supplied to the nose part is separated from the connected state and the nail shaft is attached to the lower end part of the nose. A nailing machine having a mechanism for projecting and holding the lower end portion has been proposed (see Japanese Utility Model Laid-Open No. 64-71076).

Further, in this type of nail driving machine, a safety device is provided with a contact member which is moved in the lower end direction of the nose by operating the actuating lever in the vicinity of the nose portion in order to prevent accidental firing of the nail. Has already been proposed (Practical application No. 3-53196). In this safety device, the contact member is moved toward the lower end of the nose by a manual operation of a starting lever for activating a nailing machine, and the lower end of the nose portion hits a driven material to prevent the contact member from moving, For the first time, it is possible to operate the activation valve that activates the nail driver. Therefore, even if the actuating lever is inadvertently operated before the nose portion comes into contact with the material to be driven, the contact member moves and the actuating valve does not operate, so that the nailing machine does not start.

However, in the above safety device, when the nail at the lower end of the nose part of the nailing machine is inserted into the hole for penetrating the nail shaft of the building material, that is, the nose part of the nose part is mistakenly operated first. Even if the start lever is re-operated (released once and operated again) with the lower end pressed against the material to be driven, as shown in FIG. It comes into contact with the side surface and becomes fixed,
A state occurs in which the activation lever 40 cannot return to the release position and cannot be operated. Therefore, in this case, a troublesome operation of re-inserting the lower end of the nail into the hole for inserting the nail shaft after the nail driving machine is separated from the driven material is required.

[0005]

The object of the present invention is to solve the above-mentioned drawbacks and to start the lever without moving the nailing machine even if the nose part of the nailing machine is pressed against the material to be driven while the starting lever is operated. It is an object of the present invention to provide a safety device for a nailing machine that enables nailing only by re-operating.

[0006]

To achieve the above object, a safety device for a nailing machine according to the present invention is arranged near a manually operated starting lever and a nose portion provided at a lower end of a nailing machine body. In a safety device of a nailing machine in which a starting valve is operated in cooperation with a contact member for detecting a driven material to be driven, the contact member has a retracted position where a lower end thereof does not project from a lower end surface of a nose portion. Between the lower end surface of the nose portion and a projecting position that projects downward, the nose portion is supported so as to be movable in the axial direction and constantly biased toward the retracted position by a spring. A resilient member that is movably juxtaposed and that is in constant contact with the upper end of the contact member to elastically actuate the contact member in the protruding direction by the rotation operation of the launch lever; When the operation member is engaged with the upper end of the swing lever of the contact member, and when the contact member is movable, the operating unit that retracts from the swing locus of the swing lever in response to the rotation operation of the activation lever, and presses the activation lever. With the operation section arranged as possible,
The valve stem of the starting valve does not come into contact with the valve stem of the starting valve when the contact member is movable when the starting lever is rotated, and the valve stem of the starting valve is prevented when the contact member is prevented from moving in the protruding direction. A movement locus changing means for changing the movement locus of the operating portion so as to come into contact with the operating portion, and the swing lever is swingably provided between a position engaging with the operating portion and a position separating from the operating portion. The actuator is always biased toward the side that engages with the swing lever, and the movement locus that the operating portion moves from the position retracted from the swing lever to the position that engages with the upper end of the swing lever is arranged within the swing range of the swing lever. Characterizing

[0007]

According to the above construction, when the activation lever is rotated, the elastic member operates so that the contact member moves in the projecting direction, but when the movement of the contact member is not blocked, the contact member is operated by the elastic member. Since it moves in the protruding direction, the actuating portion provided on the starting lever moves to a position retracted from the movement locus of the swing lever. At this time, since the operating portion does not come into contact with the valve stem of the starting valve, the nailing machine does not start. On the other hand, when the movement of the contact member is blocked, the movement locus of the operating portion is changed to come into contact with the valve stem of the starting valve and press the valve stem of the starting valve to start the nailing machine.

When the contact lever projecting from the lower end surface of the nose portion is pressed against the material to be driven and moved in the retreat direction after the start lever is first rotated, the start lever is released to reverse. By rotating in the direction, the operating part moves from the retracted position from the swing lever to the position that engages with the upper end of the swing lever, but since the movement locus is within the swing range of the swing lever, the operating part moves On the way, the swing lever is pushed in a direction away from the actuating portion to swing. When the actuating portion is disengaged from the swing lever, the swing lever is biased so as to always engage with the actuating portion, so that the actuating portion again engages with the upper end of the swing lever.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of a nailing machine according to the present invention. Reference numeral 1 denotes a nose portion for receiving a leading nail 2 in a connected state. The nail 2 supplied into the nose portion 1 is separated from the connected state by a not-shown dividing mechanism, and is held in a state where the lower end of the shaft portion is projected to the chuck 4 formed at the lower end of the injection port 3 of the nose portion 1. The nails 2 are sequentially supplied from the magazine 5 to the nose portion 1 by the feeding mechanism. The nail 2 supplied into the nose portion 1 is driven out of the injection port 3 by an impact mechanism having a driver 6 slidably arranged in the nose portion 1. The impact mechanism that drives the driver 6 is a cylinder 7
And a piston 8 slidably accommodated in the cylinder 7, and the driver 6 is driven by compressed air supplied to an upper portion of the piston 8 in the cylinder 7.

The impact mechanism is activated by operating the activation valve 9. The starting valve 9 is a valve housing 11
A valve 12 that is slidably arranged inside and a valve stem 14 that is exposed to the outside, and includes a manually operated starting lever 10 and a workpiece to be driven that is arranged near the nose portion 1. Of the contact member 15 of FIG.

The lower end of the contact member 15 is located around the injection port 3 of the nose section 1 and is a detection section 17 for the material 16 to be driven.
And the upper end 18 is arranged near the activation lever 10. The contact member 15 is located between the retracted position in which the detection unit 17 does not project from the lower end surface of the injection port 3 of the nose section along the axial direction of the nose section 1 and the projecting position in which the detection unit 17 further projects from the lower end surface of the injection port 3. It is supported by the nose portion 1 so that it can be moved by, and is constantly biased toward the retracted position by a compression spring 19 interposed between the nose portion 1 and the nailer housing.

A swing lever 31 is provided in parallel on the upper end 18 of the contact member 15. As shown in FIG. 2, the swing lever 31 is swingably supported by a shaft 34, and an upper end 31 is supported by a torsion coil spring 32.
a is constantly urged to a position (a position where the lower end 31b engages with the wall portion 33 of the contact member 15) of the actuating portion 22 (described later) of the starting lever 10, and the engaging position and the actuating portion 22 are
It is provided so as to oscillate between positions away from each other.

Next, the starting lever 10 is attached to the starting lever 1.
An elastic member 20 is provided that elastically actuates the contact lever 15 to the projecting position against the biasing force of the compression spring 19 by the turning operation of 0. The elastic member 20 is composed of a torsion coil spring, and one end 21 of the elastic member 20 has a contact member 1.
5, the contact member 15 is elastically actuated in the projecting direction via the one end 21 of the elastic member 20 due to the start lever 10 being rotated.

Further, the starting lever 10 is provided with an operating portion 22 formed in a substantially L shape and an operating portion 25 formed in a hook shape. The operating portion 22 is rotatably supported by a shaft 23 that rotatably supports the starting lever 10, and has an operating end 24 which is engaged with the upper end of the swing lever 31 of the contact member 15 on one side and the other on the other side. A shoulder portion 26 that can be engaged with the operation portion 25 is formed on the. The operating end 24 is on the movement locus of the swing lever 31 of the contact member 15 and engages with the upper end 31a of the swing lever 31 when the starting lever 10 is in the non-operated state.
Is operated so as to rotate to a position (the position in FIG. 4) retracted from the movement locus p of the swing lever 31 in response to the rotation operation of the starting lever 31. Further, the movement locus of the operation portion 22 moving from the retracted position from the swing lever 31 to the position where it is engaged with the upper end 31a thereof is arranged within the swing range of the swing lever 31.

The operating portion 25 is rotatably supported on the starting lever 10 by a shaft 30, and has an operating end 28 which engages with the valve stem 14 of the starting valve 9 at one end side formed in a hook shape and another. Engaging surfaces 29 that engage with the shoulder portions 26 of the actuating portion 22 are formed on the end sides. Furthermore, the operation unit 2
5 is urged by a spring 35 arranged on the shaft 36 so that the engagement surface 29 always contacts the shoulder portion 26 of the operating portion 22. At this time, at the same time, the operating end 24 of the operating portion 22 is also urged to engage with the swing lever 31 of the contact member 15.

By the way, the operating portion 25 is linked to the moving locus changing means so that the locus during normal operation is changed when the starting lever 10 is rotated about the shaft 23 at the time of starting. This movement locus changing means is constituted by the shoulder portion 26 of the actuating portion 22 and the engaging surface 29 of the operating portion 25, and the shoulder portion 26 is operated by the shoulder portion 26 when the operating portion 22 rotates and when it does not rotate. By changing the position at which the engaging surface 29 is engaged, the angle of the operating portion 25 with respect to the starting lever 10 is changed, and the operating portion 2 is rotated when the starting lever 10 is rotated.
The operation end 28 of No. 5 is variably set so as to have a movement locus that contacts the valve stem 14 of the starting valve 9 or does not contact. That is, when the contact member 15 is movable in the projecting direction, the operating portion 22 is rotationally moved to the retracted position retracted from the movement locus of the swing lever 31 in accordance with the rotation operation of the activation lever 10, and Accordingly, the operating end 28 of the operating portion 25 is connected to the valve stem 1 of the starting valve 9.
4, the start valve 9 does not operate. However, as shown in FIG. 3, when the detection unit 17 comes into contact with the driven material 16 and the movement of the contact member 15 is blocked, the operation unit 22 cannot rotate and the operation end 28 of the operation unit 25 has a start valve. The movement locus is changed so as to come into contact with the valve stem 14 of No. 9, and the start valve 9 operates.

In the structure described above, the contact member 15 is held in the upper position in the drawing, that is, in the retracted position by the action of the compression spring 19 before the actuation lever 10 is operated as shown in FIG. In this state, one end 21 of the torsion coil spring 20 arranged on the actuating lever 10 is engaged with the front end edge of the actuating lever 10 so that the contact member 15 is not substantially elastically acted. Furthermore, in this state, the operating portion 2
The second operating end 24 is engaged with the upper end 31 a of the swing lever 31 of the contact member 15.

Therefore, as shown in FIG. 3, the lower end of the shaft of the nail 2 is accurately positioned and the injection port 3 of the nose portion 1 is inserted into the material 1 to be driven.
When the starting lever 10 is rotated after being pressed against 6,
One end 2 of the torsion coil spring 20 arranged on the starting lever 10.
1 presses the upper end 18 of the contact member 15 downward in the figure, which causes the contact member 15 to move in the protruding direction. However, the contact member 15
Of the torsion coil spring 20 because the detecting portion 17 of the torsion coil spring 20 contacts the driven material 16 and is prevented from moving in the protruding direction.
1 stops in a state of contacting the upper end 18 of the contact member, and the torsion coil spring 20 bends as the rotation operation of the start lever 10 progresses.

Since the contact member 15 is prevented from moving in the protruding direction, the operating end 24 of the operating member 22 is prevented.
Is blocked from engaging with the swing lever 31 of the contact member 15, whereby the shoulder 26 of the actuating portion 22 and the engaging surface 29 of the operating portion 25 cooperate with each other to operate the operating end of the operating portion 25. The movement locus of 28 is changed, and the operation end 28
Contacts the valve stem 14 of the starting valve 9 and operates it to start the nailing machine.

By the way, in a state where the driven material 16 is not arranged in front of the injection port 3 of the nose portion 1, the starting lever 10 is provided.
When the rotation lever is rotated, one end 2 of the torsion coil spring 20 is rotated with the rotation of the starting lever 10 as shown by a dotted line in FIG.
The contact member 15 moves to the protruding position via 1. The working end 24 of the working part 22 is initially the contact member 1.
5 is engaged with the swing lever 31, but the engagement with the swing lever 31 is released as the rotating operation progresses,
It rotates together with the starting lever 10. Start lever 1
At the end of the turning operation of 0, the operating end 24 of the operating portion 22 is arranged at a position retracted from the movement trajectory of the swing lever 31. For this reason, since the movement locus of the operating end 28 of the operating portion 25 is not changed by the turning operation of the starting lever 10, the operating end 28 does not engage with the valve stem 14 of the starting valve 9, so that the nailing machine is operated. Is not started.

In the above state, the detecting portion 17 of the contact member 15 projects downward from the lower end surface of the nose portion 1,
Even if this is inadvertently pressed against the material 16 to be driven and moved in the retreat direction, the contact member 15 moves and its upper end 1
8 only elastically bends and deforms one end 21 of the torsion coil spring 20, and since the operating end 24 of the operating portion 22 is retracted from the movement trajectory of the contact member 15, the operating portion 22 does not operate and the operating portion 25 Does not operate the start valve 9 (see the solid line in the figure). Therefore, it is possible to prevent the nailing machine from exploding. In this case, the actuating end 24 of the actuating portion 22 is engaged with the upper end 31a from the retracted position from the swing lever 31 by releasing the actuating lever 10 and rotating it in the opposite direction by the torsion coil spring 20 as shown in FIG. However, since the movement locus is within the swing range of the swing lever 31, the operating portion 22 pushes the swing lever 31 in the direction away from the operating portion 22 to swing the swing lever 31 during its movement. The operating portion 22 is disengaged from the swing lever 31 and then engages with the upper end 31a of the swing lever 31 again to be in the initial state. Further, when the activation lever 10 is re-actuated while the nose portion 1 is pressed against the material 16 to be driven, the contact member 15 is prevented from moving, so that the movement locus of the operation end 28 of the operation portion 25 is changed again. The operating end 28 is engaged with the valve stem 14 of the starting valve 9 to operate it.
The nailer can be activated.

[0022]

According to the safety device for a nailing machine of the present invention, the nailing machine can be surely prevented from being activated even when the contact member is operated while the activation lever has been operated. It is possible to provide a nailing machine with high safety, which can prevent an accident such as a nose portion of the nailing machine coming into contact with a worker or the like and causing an accident when the work place is moved while operating the starter lever.

Further, while the lower end of the nose of the nailing machine is being pressed against the material to be driven while the starting lever is being operated, nailing can be performed only by re-operating the starting lever without moving the nailing machine. Therefore, even if an erroneous operation is performed, it is not necessary to perform the troublesome nail driving position adjusting operation again, and the workability is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a nailing machine provided with a safety device according to the present invention.

FIG. 2 is a cross-sectional view of a main part of the safety device showing a state before operating a start lever.

FIG. 3 is a cross-sectional view of essential parts showing an operating state when a driven material is placed in front of the nose part.

FIG. 4 is a cross-sectional view of essential parts showing an operating state when a material to be driven is not placed in front of the nose part.

5 is a cross-sectional view of essential parts showing an operating state when the starting lever is opened from the state of FIG. 4.

FIG. 6 is a sectional view of a main part of a conventional safety device.

[Explanation of symbols]

 1 Nose Part 6 Driver 9 Start Valve 10 Start Lever 14 Valve Stem 15 Contact Member 17 Detection Part 18 Upper End 19 Compression Spring 20 Resilient Member (Torsion Coil Spring) 22 Actuating Part 24 Actuating End 25 Operating Part 31 Swing Lever

Claims (1)

[Scope of utility model registration request] 1. A starting valve is operated in cooperation with a manually operated starting lever and a contact member for detecting a driven material arranged near a nose portion provided at a lower end of a nailing machine body. In the safety device for a nail driver, the contact member is moved in the axial direction of the nose portion between a retracted position where the lower end of the contact member does not protrude from the lower end surface of the nose portion and a protruding position where the lower end protrudes downward from the lower end surface of the nose portion. Freely and constantly supported in the retracted position by a spring bias, a swing lever is swingably juxtaposed on the upper end of the contact member, and the start lever is always in contact with the upper end of the contact member. The elastic member that elastically actuates the contact member in the protruding direction by the rotation operation of the start lever and the upper end of the swing lever of the contact member when the start lever is not operated, When an actuating member is movable, an operating portion that retracts from the movement locus of the swing lever in response to a rotating operation of the start lever and an operation portion that is arranged to be able to press the start lever are provided, and When the contact member is movable during the turning operation, it does not come into contact with the valve stem of the starting valve, but comes into contact with the valve stem of the starting valve when the contact member is prevented from moving in the protruding direction. Is provided with a movement locus changing means for changing the movement locus of the operating portion, and the swing lever is swingably provided between a position where the swing lever engages with the operating portion and a position where the swing lever separates from the operating portion, and engages with the operating portion. The swing locus of the swing lever moves along the moving path from the retracted position of the swing lever to the position where it engages with the upper end of the swing lever. Safety device of the nailing machine, characterized in that arranged to be in the range.