JPH0472669B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a nailing machine, and more particularly to an automatic nailing machine capable of continuously driving nails using a nail holding strip that holds nails at equal intervals. .

2. Description of the Related Art Nailers capable of continuously driving nails using nail holding strips that hold nails at regular intervals are well known and are widely used in the construction industry and the like. These nailers are, for example, as disclosed in U.S. Pat. No. 3,547,003.
In addition to the nail feeding mechanism that guides the nail holding strip and feeds the nails one by one into the nose driving part, and the nail driving mechanism that drives the nails in the nose driving part through the tip of the nose and into the object by pulling the trigger. , is equipped with a safety mechanism that moves back and activates the trigger only when the tip of the nose is pressed into a predetermined position on the object, thereby ensuring that the nail will not be driven in unless the nose is in the predetermined position. We are trying to

This safety feature allows the user to use the nail gun in two ways. One is called a touch trip, which drives the nail by holding down the trigger and pressing the tip of the nose into place.If the trigger is locked in the pulled position, the user can operate the nail gun. It has the advantage that all you have to do is press it into a predetermined position. The other one is
This is called a trigger trip, which involves pressing the nose of the nail gun into a predetermined position and then pulling the trigger. Although this is more troublesome than the touch trip because it requires two operations, it has the advantage of ensuring reliable driving. Therefore, either method is used on a case-by-case basis.

Problems to be Solved by the Invention The above-mentioned nailing machine sometimes performs double nailing. This cannot be completely eliminated even with a trigger trip. If double driving occurs, not only will the nail be driven into the target object incorrectly, but the nail will also become jammed at the nose, which will adversely affect the next nail driving operation. When we researched this double-driving problem, we found that when the blade of the nail-driving mechanism rapidly moves forward and drives the nail, the nail-driving machine moves backwards as a whole due to the reaction, and the safety mechanism returns to the front and then immediately returns. I realized that it was because I was forced into it. In other words, the reaction causes an unwanted touch trip operation. This type of double-driving often occurs in nailers with short stroke safety mechanisms.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a nail gun that can reliably avoid double driving.

Means for Solving the Problems In order to achieve the above object, the nail gun according to the present invention includes a first hook member and a second hook member attached to both sides of the trigger so as to rotate together with the trigger, and these hooks. a pin attached to the safety mechanism at a position adjacent to the member and selectively movable to a position cooperating with either hook member;
The first hook member is made of a rigid plate-shaped body, and when the pin is in the cooperative position, the tip of the first hook member is in contact with the pin when the trigger is pulled without pressing the nose tip against the object. It is in a position to prevent the safety mechanism from retracting, and when the tip of the nose is pressed against the object and the safety mechanism is retracted and the trigger is pulled, the hook part is in a position to hold the pin and prevent the safety mechanism from retracting. The second hook member is made of a plate-like body having spring elasticity, and when the pin is in the cooperative position and the trigger is pulled without pressing the nose tip against the object, the hook portion and the tip are connected. The side surface in between is in a position where the pin pushes the safety mechanism backward, and when the tip of the nose is pressed against the object and the trigger is pulled, the hook part holds the pin and the safety mechanism closes. The pin is in a position to prevent the return of the safety mechanism, and the pin is formed in the shape of a rod and is mounted so as to be movable in a direction transverse to the safety mechanism at a position adjacent to the trigger, and can be moved to a position where it does not cooperate with any hook member. It is characterized by

Embodiments Examples of the present invention will be described below with reference to the drawings. Before explaining the features of the present invention, the general structure and operation of the nail gun according to the present invention will be briefly explained using FIGS. 1 to 3. Nailer 1
The main body includes a lower handle 2 and an upper cylinder 3, and a nail feeding mechanism that guides a nail holding strip 5 holding nails 4 at equal intervals and feeds the nails 4 one by one into the driving part of the nose 6. 7, and by pulling a trigger 8 pivotally supported on the handle 2, a trigger valve 9 is operated to send compressed air into the cylinder 3, driving a piston (not shown) in the cylinder forward and connecting it to the piston. The blade 10 is rapidly moved forward to drive the nail in the driving part of the nose 6 into the object from the tip 11 of the nose. The nail feeding mechanism 7 is linked to the trigger operation, and when a nail is driven from the nail driving part and the trigger valve 9 returns to its normal state, the next nail is fed into the nose 6 using the feed hole 12 of the strip 5.
feed it into the driving section.

For such nailers capable of continuous driving, there is a safety mechanism 1 that prevents the nails from flying out even if the trigger is pulled when the nailer is not applied to an object.
3 is provided. This safety mechanism 13 extends from the nose tip 11 to the trigger 8, and retreats to enable the operation of the trigger 8 only when the nose tip is pressed against an object. More specifically, the safety mechanism 13 includes a cylindrical body 14 that covers the tip of the nose, a link member 15 that extends from the cylindrical body to the trigger 8, and a rear end of the link member 15 that extends into the trigger, and is pivoted to the rear end of the link member 15 that extends into the trigger valve 9. It is equipped with a lever 17 that acts on the piston 16 and a spring 18 that is provided between the nose 6 and the cylindrical body 14 and always biases the cylindrical body 14 forward, so that it is always in the forward position and in this state. So trigger 8
Even if the piston 16 of the trigger valve 9 is pulled, the piston 16 of the trigger valve 9 is not pushed. However, when the nose tip 11 is pressed against the object, the cylindrical body 14 moves backward against the spring 18, and the pivot point 1 of the lever 17 moves through the link 15.
9 also moves backwards. Therefore, as shown in FIGS. 4 and 5, when the trigger 8 is pulled, the lever 17 pushes the piston 16, the trigger valve 9 operates, and the blade 1
0 moves forward rapidly.

Although the above is a general description of the known parts of the nail gun according to the present invention, the reader is referred to US Pat. No. 3,547,003 for further details.

The configuration that characterizes the present invention will be described below. As best shown in FIG. 2, the trigger 8 has a first hook member 21 and a second hook member 22 attached to its side surfaces, respectively. These hook members are used selectively and function independently, and have the same effect in avoiding the influence of reaction when driving the safety mechanism 13, but have slightly different effects in the driving method. have The first hook member 21 is also shown in FIG. 3, and is pivotally supported by a pivot pin 23 of the trigger 8, and is fixed to the trigger 8 by a pin 24 or the like so as to interlock with the trigger 8. The first hook member 21 is made of a slightly thick and rigid plate-like body, and a hook 25 is formed near the tip thereof.
The distal end surface 26 is slightly shortened.

The second hook member 22 is also shown in FIG.
The trigger 8 is fixed to the trigger 8 by a pin 27 or the like so as to be interlocked with the trigger 8. The second hook member 22 is made of a slightly thin plate-like body with spring elasticity, and has a hook 28 formed near its tip, which extends longer forward than the first hook member 21, and has a relief at the lower end of the tip 29. A guide 30 is formed.

Adjacent to these hook members 21, 22, a pin 32 is attached to the link 15 of the safety mechanism. For more details, see Safety Mechanism Link 1
5 is the hook 25, 2 of both hook members 21, 22.
It hangs downward near 8, and a U-shaped bracket 33 is formed here. This bracket 33 extends integrally from the link 15, but is supported by a pin 34 attached to the main body for the purpose of maintaining strength. The holes 35 and 36 for receiving the pin 34 are formed into elongated holes so that the link 15 can be moved.

A rod-shaped pin 32 is attached to the bracket 33 so as to be movable in the lateral direction of the nail gun.
The overall length of this pin 32 is shorter than the distance between the part of the first hook member 21 where the hook 25 is located and the part where the hook 28 of the second hook member 22 is located, and The lateral travel distance is such that it can project outwardly from each hook member. Therefore, the pin 32
It is adapted to selectively cooperate with either the hook member 21 or the second hook member 22 by its lateral movement. As is clear from FIG. 7, it is also possible to select a position that does not cooperate with either of the hook members.

The pin 32 has one end 38 attached to the first hook member 2.
1 and the other end 39 cooperates with the second hook member 22. The position of one end 38 of the pin 32 is such that when the trigger 8 is pulled without pressing the nose tip 11 against the object (the chain line position in FIG. 3), it comes into contact with the tip 26 of the first hook member 21 and prevents the safety mechanism 13. The first hook member 21 is in a position that prevents the link 15 from retreating, and when the nose tip 11 is pressed against the object, the link 15 of the safety mechanism 13 is retreated, and the trigger 8 is pulled (the chain line position in FIG. 5). It is held by the hook 25 of the safety member 13 and is in a position to prevent the safety member 13 from returning.

Further, the other end 39 of the pin 32 is attached to the second hook member 2.
When the nose tip 11 is pressed against the object and the safety mechanism 13 is retracted and the trigger 8 is pulled (the chain line position in Fig. 4), the second
The pin 32 is held by the hook 28 of the hook member 22 and is in a position to prevent the safety mechanism from returning.
The other end 39 is pushed sideways between the hook 28 and the tip 29 of the second hook member 22 when the trigger is pulled without pressing the nose tip 11 against the object (the chain line position in FIG. 1). The link 15 of the safety mechanism 13 is located at a position where the link 15 of the safety mechanism 13 can be moved backward. In order to satisfy these positional relationships, the second hook member 22 is attached to the first hook member 21.
In contrast, it is slightly longer from the hook to the tip. Further, the second hook member 22 has spring elasticity and is formed to be able to be deflected laterally.

The second point is that the pin 32 moves to a position where it cooperates with the first hook member 21 or the second hook member 22, or a position where it does not cooperate with either of them.
See also FIGS. 6 and 7. That is, FIG. 2 shows the position where the pin 32 cooperates with the first hook member 21, FIG. 6 shows the position where the pin 32 cooperates with the second hook member 22, and FIG. shows the position in which the pin 32 does not cooperate with both hook members. In this way, the pin 32 can take various positions, but it needs to be fixed in these positions. For this reason, the outer periphery of the pin 32 has circumferential grooves 4 at three locations in the longitudinal direction.
0 is formed on the other bracket 33, and a spring-biased lock lever 41 extends downward and is arranged to fit into the circumferential groove 40.
Therefore, to change the lateral position of the pin 32, pull the lever 41 to the left in the drawing to disengage it from one circumferential groove 40, move the pin 32, and move the pin 32 to the other circumferential groove 40.
What is necessary is to fit the lever 41 therein.

The operation of the nailing machine of the present invention having the above configuration will be explained. First, the case where the pin 32 is in a position where it cooperates with the first hook member 21 will be described. Please refer to Figures 2, 3, and 5 for the drawings. As shown in FIG. 2, the pin 32 is moved to a position where its tip 38 protrudes laterally from the first hook member 21, and the lock lever 41 that fixes it in this position is fitted into the groove 40 of the pin 32. There is. When the trigger 8 is pulled in this state, the first hook member 21 turns together with the trigger 8 and moves to a position where its tip 26 abuts the tip 38 of the pin 32, as shown by the chain line in FIG. In this state, even if the nose tip 11 is pressed against the object, the link 15 of the safety mechanism will not reach the pin 32.
Since it is brought into contact with the first hook member 21, it cannot be moved back. In other words, a touch trip operation in which the tip of the nose is pressed against an object while the trigger is held is prohibited.

Therefore, the first hook member 21 functions only to perform a trigger tripping action. Please refer to FIG. 5 regarding this trigger trip operation. Before pulling the trigger 8, the nose tip is pressed against the object and the cylindrical body 14 and link 15 of the safety mechanism 13 are retracted. When the trigger 8 is pulled in this state, the first hook member 21 is rotated to the position shown by the chain line, and the hook 25 is attached to the pin 3.
Hold the tip 38 of 2. Therefore, as long as the trigger 8 is pulled, the link 15 of the safety mechanism does not return forward and remains in that position even if the tip of the nose separates from the object due to the reaction of the rapid movement of the blade. That is, the piston 16 of the trigger valve 9
remains pressed, the blade does not double-strike, and double-strike of the nail is reliably prevented.

Next, when the pin 32 is in a position where it cooperates with the second hook member 22, FIG. 1, FIG. 4, and FIG.
This will be explained with reference to the figures. The pin 32 is moved so that its tip 39 is in a position protruding laterally from the second hook member 22, as shown in FIG.
A lock lever 41 fits into a predetermined groove 40 to hold and fix the position of the pin. When the trigger 8 is pulled in this state, the second hook member 22 pivots to the position shown by the chain line in FIG. This second hook member 2
2 is made of a spring-elastic material as described above, so it comes into contact with the tip 39 of the pin 32 and is bent further outward than the pin, as shown by the broken line in FIG. In this state, when the nose tip 11 is pressed against the object, the link 15 of the safety mechanism 13
2, the lever 17 into the trigger 8 pushes the piston 16 of the trigger valve 9, forcing compressed air into the cylinder 3 and moving the blade 10 rapidly forward, as shown by the chain line in FIG. and drive the nail into the object.
That is, a touch-trip operation can be performed. However, as shown by the chain line in FIG. 4, when the trigger valve 9 is energized, the second hook member 22 returns to the position shown by the solid line, and the hook 28 touches the tip 32 of the pin 32. safety mechanism 13 unless held and trigger 8 is released.
The link 15 is not allowed to return, and the touch trip is only performed once. This also means that the safety mechanism is prevented from returning due to reaction when the blade is driven in, thereby reliably preventing double strikes.

When the second hook member 22 is enabled,
Trigger tripping is also possible. That is,
As shown in FIG. 4, this is a driving method in which the tip of the nose is first pressed against the object and the trigger 8 is pulled in this state. In this case as well, the hook member 22 as shown by the chain line in FIG.
The tip 39 of the link 15 is held and the link 15 does not return unless the trigger 8 is released, thereby preventing double strikes.

FIG. 7 shows the pin 32 in a position in which it does not act on either the first hook member 21 or the second hook member 22; It operates like this, and can perform not only trigger trips but also touch trips continuously.

Effects of the Invention According to the present invention, the first hook member attached to one side of the trigger and the second hook member attached to the other side of the trigger are formed in a rod shape and can move in a direction transverse to the safety mechanism. By combining the pin and the first hook member, when the trigger is pulled without pressing the tip of the nose against the object, the tip will come into contact with the pin and prevent the safety mechanism from retracting, allowing the nail to move away from the object. Trigger trip to prevent the pin from being driven in. While ensuring the safety of driving, the tip of the nose is pressed against the object and the safety mechanism is moved back, and when the trigger is pulled, the hook part holds the pin and prevents the safety mechanism from moving back. This prevents double hammering due to the reaction of nail driving, and the second hook member and pin allow the safety mechanism to retreat without pressing the tip of the nose against the target object while the trigger is pulled, allowing touch-trip driving. When the tip of the nose is pressed against the object and the trigger is pulled, the hook part holds the pin and prevents the safety mechanism from returning, preventing double strikes due to recoil. By moving the screws to a position where they do not cooperate with each other, it is possible for skilled workers to perform continuous driving while allowing both types of driving methods to be used. That is, according to the present invention, nails can be driven in one of the three working modes by simply combining two hook members and a rod-shaped pin and selecting the position of the pin.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional side view from the right side of a portion of a nailing machine incorporating features of the present invention; FIG.
FIG. 3 is a left side partial sectional view of the nailing machine shown in FIG. 1, and FIG. 4 is a right side of a part of the nailing machine according to the present invention with the safety mechanism retracted. 5 is a left side partial sectional view of the nailing machine of FIG. 4; FIG. 6 is a partial bottom view of the nailing machine in which the pin is in cooperative relationship with the second hook member; FIG. 7 is a partial sectional view of the nailing machine shown in FIG. 1 is a partial bottom view of the nail gun in a position where the pin does not cooperate with both hook members; FIG. 1... Nailer, 2... Handle, 3... Cylinder, 4... Nail, 5... Nail holding strip, 6...
Nose, 7... Nail feeding mechanism, 8... Trigger, 9
... Trigger valve, 10 ... Blade, 11 ... Nose tip, 13 ... Safety mechanism, 14 ... Cylindrical body,
15...Link, 16...Piston of trigger valve, 17...Lever, 18...Spring, 21...First hook member, 22...Second hook member, 25...
...the hook of the first hook member, 26...the tip of the first hook member, 28...the hook of the second hook member,
32...pin, 33...bracket, 38,39
...Pin tip, 41...Lock lever.

Claims (1)

[Scope of Claims] 1. A nail feeding mechanism that guides a nail holding strip that holds nails at equal intervals and feeds the nails one by one into the nose driving part, and a nail feeding mechanism that feeds the nails one by one into the nose driving part by pulling a trigger. A nail driving mechanism that drives a nail into an object through the tip of the nose, and a safety mechanism that extends from the tip of the nose to the trigger and retreats only when the tip of the nose is pressed against the object to enable operation of the trigger. In the nailing machine, a first hook member and a second hook member are attached to both sides of the trigger so as to rotate together with the trigger, and the safety mechanism is attached to the safety mechanism at a position adjacent to these hook members, and one of the hook members is attached to the safety mechanism at a position adjacent to these hook members. a pin selectively movable to a position cooperating with the member;
The hook member is made of a rigid plate-shaped body, and the first hook member has a nose tip that is in contact with the pin when the trigger is pulled without pressing the nose tip against the object when the pin is in the cooperative position. The hook portion is in a position to prevent the safety mechanism from retreating, and when the tip of the nose is pressed against the object and the safety mechanism is retreated and the trigger is pulled, the hook portion is in a position to hold the pin and prevent the safety mechanism from retreating. The second hook member is made of a plate-like body having spring elasticity, and when the pin is in the cooperative position and the trigger is pulled without pressing the nose tip against the object, the second hook member becomes a hook portion. The side surface between the nose tip and the tip is pushed sideways by the pin in a position that allows the safety mechanism to retreat, and when the nose tip is pressed against the object and the trigger is pulled, the hook part holds the pin. The pin is in a position to prevent the safety mechanism from returning, and the pin is formed into a rod shape and is mounted adjacent to the trigger so as to be movable in a direction transverse to the safety mechanism, and is moved to a position where it does not cooperate with any hook member. A nail gun characterized by being able to 2. The safety mechanism includes a cylindrical body that covers the tip of the nose, a link member that extends from the cylindrical body to the trigger, and a lever that is provided within the trigger and is pivoted to the rear end of the front link member and acts on the piston of the trigger valve. 2. The nailing machine according to claim 1, further comprising a spring provided between the nose and the cylindrical body to constantly bias the cylindrical body forward. 3. The nailing machine according to claim 1, wherein grooves are cut in the pin at three locations, and a lock lever biased by a spring engages with the grooves.