JP2566778Y2 - Nail cutter - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is to disassemble the formwork assembled and used in the construction of concrete buildings, and then to the plywood etc. used as the dam board of the formwork The present invention relates to a nail cutter used for pulling out nails left as they are driven, that is, a so-called nail closing operation.

(Conventional technology) In constructing a concrete building, formwork is performed in which a formwork is assembled, concrete is poured, and after the concrete solidifies, the used formwork is dismantled. .

In the formwork dismantling work in this formwork work, as shown in FIG. 8, for example, the pier (b) is attached to the plywood (a) used as a weir board by nails (c), and As shown in the figure, a bar (d) is driven between the plywood (a) and the pier (b), and the bar (d)
Plywood (b) by prying down the pier (b)
The work of separating the pier and the pier (b) has been conventionally performed. Then, the separated plywood (a) is arranged, stacked, and moved as it is.

The work of dismantling the formwork is a rough work because it is a heavy work of handling heavy members such as plywood (a) and piers (b) of the formwork. Therefore, the nail (c) that remains driven into the plywood (a), unlike the new one, has almost no protruding part on the tip side standing straight, and the bent or severe one is shown in Fig. 10. As shown, it is bent and attached to the surface of plywood (a).

During the period from the dismantling work of the formwork to the assembling work of the next formwork, a so-called nail closing work for pulling out the nail (c) remaining on the separated plywood (a) or the like is performed. ,
The number of nails to be pulled out is usually 3 x 6 plywood (a) and 15
It is about 20.

In the nail closing work, the nail is bent and attached to the surface of the plywood (a) as shown in FIG. 10, or the bent nail (c) is used as shown in FIG. Using a hammer (H) with a nail puller (E), raise it straight, and then hook the nail puller (H) on the head (G) of the nail (C). As shown in Fig. 13, the tip of the nail (C) is hit with a hammer (F) to lift the head (G) of the nail (C) from the surface of the plywood (A), and then the plywood (A) is Turn it over, hook the nailed part (e) of the hammer (he) on the head (g) of the nail (c), and pry the nail (c) with the hammer (he) to obtain the nail as shown in Fig. 14. Conventionally, a method of removing (c) from the plywood (a) has been performed. That is, in the nail closing operation, the above operation is repeatedly executed for each nail (c) remaining on the plywood (a).

(Problems to be solved by the invention) By the way, the above-mentioned conventional nail closing work involves bending and attaching to the surface of the plywood (a) or bending the nail (c) to a hammer (to). In order to straighten it up and straighten it, hammer (to) the nail (c)
In addition to the large number of labor and time required for the work, the work is performed while turning over a large and heavy plywood (a), so a large operation force is required and the work efficiency is poor. was there.

The present invention has been made in view of the above-mentioned conventional circumstances, and involves a series of work related to a series of work of pulling out a bent nail peculiar to nail removal work and hitting the tip of the nail to remove the nail. In addition to improving the operability and omitting the conventional reversing work, the work load is greatly reduced, and moreover, it is possible to secure the more effective strength of the component members suitable for the series of work. The purpose is to provide a very good nail cutter.

(Means for Solving the Problems) In order to solve the above-mentioned problems, in the invention of item 1,
A gun body incorporating driving means driven by operation of an operation unit such as a trigger, an extrusion pin pushed forward by the driving means, and a guide member having a guide hole for guiding forward and backward movement of the extrusion pin. In the retracted state of the push-out pin, the protrusion of the nail projecting from the plate is inserted into the guide hole, and the nail is pulled out by operating the operation unit to advance the push-out pin through the driving means. In the nail cutter, the outer shape of the guide member is formed in a substantially triangular plate shape having the tip portion as the top portion and the rear portion as the bottom portion. In such a state, a technical means of fixing to the gun body side via the wide portion behind the guide member is adopted. As described above, in the present invention, since the outer shape of the guide member is formed in a substantially triangular plate shape having the tip portion as the top portion and the rear portion as the bottom portion, and the plate-like surface is laterally extending to the left and right, When the gripper is gripped and the gun body is tilted to the right or left and the protrusion of the nail is inserted into the guide hole, there is no obstruction protruding sideways and the tilting work is extremely easy, and the orientation of the guide member Since the plate-shaped plane is set to the horizontal direction extending left and right, and fixed to the gun body side through the wide portion at the rear, the guide member and the guide member in the work of raising the bent portion of the nail inserted into the guide hole are set. It is possible to more effectively secure the strength against a bending moment and the like caused by the pulling force acting on the joint with the gun body.

Further, in the invention of the second aspect, in the nailing machine, the outer shape of the guide member is formed in a tapered shape with the tip of the guide member as a top, and the rear portion is fixed to the gun body side, A technical means of forming a trumpet-shaped guide portion inside the front end portion of the guide hole formed in the guide member is employed. Thus, when a nail bent into a state of being attached to a surface of a plywood or the like is inserted into the guide hole, if the guide member is appropriately inclined, the guide of the trumpet-shaped guide portion inside the distal end portion of the guide hole can be achieved. Due to the synergistic effect with the action, the nail can be guided very easily into the guide hole. That is, due to the interaction between the ease of inclination obtained from the tapered outer shape of the guide member and the guiding action of the trumpet-shaped guide formed inside the distal end of the guide hole, the guide is substantially parallel to the nail. , And can be inserted very easily with an appropriate inclination without inclination. Further, since the outer shape of the guide member is formed to be tapered and fixed to the gun body side at the rear portion, in addition to the ease of inclination of the gun body, the sectional area of the fixed portion to the gun body side is reduced. Since it is large, sufficient strength can be easily obtained at the joint between the guide member and the gun body.

(Operation) In the nail cutter according to the present invention, the grip portion of the gun body is gripped and tilted right or left as it is, and the tip of the guide hole formed in the guide member protrudes from the target plate. The protrusion of the nail is inserted into the guide hole by pushing in accordance with the tip of the protrusion of the nail, and then the gun body is pryed up so that the guide holes of the nail and the guide member are perpendicular to the surface of the plate. The nail is pushed out along the guide hole of the guide member and the nail hole of the plate by operating the operation unit such as a trigger and advancing the pushing pin through the driving means. A series of nail removal operations of removing the nail from the inside of the hole can be easily performed.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. In the drawing, reference numeral 3 denotes a gun body of the nail removing machine, in which an air supply base 1 at a lower end thereof is connected to a compressor (not shown) via a hose 2, and a front-rear direction cylinder 4 constituting a driving means is built in an upper part. I have. A guide member 5 for guiding the push-out pin to be described later in the longitudinal direction is fixed to the upper front of the gun body 3. The guide member 5 is formed in a substantially triangular plate shape having a front end as a top and a rear portion as a bottom. The guide member 5 is oriented in a horizontal direction with a plate-shaped plane extending left and right, that is, when viewed from above. The guide hole 7 is set in a state of forming a substantially triangular shape with both sides tapered in a tapered shape, and a guide hole 7 in the front-rear direction is formed at the center portion, and a front edge portion is thin inside the front end portion of the guide hole 7. The guide hole 7 and the cylinder 4 are concentric with each other through a bottom portion forming a substantially triangular shape of the guide member 5 or a wide portion behind the bottom portion. It is fixed to the gun body 3 so as to be in a state.

In the drawing, reference numeral 8 denotes a trigger constituting an operation unit provided in the gun body 3, reference numeral 9 denotes a piston in the cylinder 4, and reference numeral 10 denotes an extrusion pin fitted in the guide hole 7 of the guide member 5 so as to be able to move back and forth. As shown in FIG. 4, a conical recess 14 is formed in the front end surface of the push pin 10, and the base is fixed to the piston 9 as shown in FIG. Thus, when the trigger 8 of the gun body 3 is pulled, the compressed air of the compressor is supplied from the air supply mouth 1 through the inside of the gun body 3 into the rear part of the cylinder 4 and the piston 9
Moves forward, and as the piston 9 advances, the pushing pin 10
Moves in the guide hole 7 of the guide member 5, and as shown by a chain line in FIG.
It will protrude about 7mm. Thereafter, when the trigger 8 is released, the compressed air is supplied into the front portion of the cylinder 4 in the opposite manner as described above, and the piston 9 retreats as shown by a dotted line in FIG. 5 guide holes 7
Will be returned to the rear retracted position.

In the figure, 11 is a plywood used for a concrete formwork dam,
Numeral 12 denotes nails that remain driven into the plywood 11 after removing a pier or the like from the plywood 11 after dismantling the formwork, and 13 denotes plywood 11
This is a nail hole formed by driving a nail 12 into the hole.

Next, how to use this embodiment will be described. This embodiment is carried out when the nail puller is carried by holding the gun body 3 and the protruding portion of the nail 12 is bent and stuck to the surface of the plywood 11 as shown in FIG. Then, the gun body 3 is inclined in the lateral direction, and one side inclined surface of the guide member 5 is plywood.
By pressing the guide member 5 against the nail 12 while sliding it on the plywood 11 with the guide hole 7 of the guide member 5 facing the tip of the nail 12, The tip of the nail 12 is very easily introduced into the guide hole 7 by the guiding action of the trumpet-shaped guide 6 formed inside the tip. In that state, the nail is
Further, the protrusion of the nail 12 is inserted into the guide hole 7 of the guide member 5 while prying up the tip of the twelve 12, and thereafter the gun body 3 is raised as shown in FIG. The protrusion of the nail 12 is straightened by raising the guide member 5 so as to be substantially perpendicular to the surface of the nail.

Next, when the trigger 8 is pulled, the piston 9 moves forward by the compressed air, and accordingly, the push pin 10 moves forward. The recess 14 fits into the tip of the nail 12 by the forward movement of the push pin 10, and the nail 12 further moves the guide hole 7 of the guide member 5 and the plywood 11.
7 and the tip of the push pin 10 protrudes from the guide hole 7 of the guide member 5 into the nail hole 13 of the plywood 11 as shown in FIG. Push out from inside the nail hole 13 of 11. As a result, the nail 12 protrudes below the plywood 11.

Thereafter, when the trigger 8 is released, the piston 9 is retracted by the compressed air in the opposite direction, and the pushing pin 10 returns to the state shown by the dotted line in FIG. 3 and is held.

The above operation is repeated for each of the nails 12 remaining on each plywood 11 to perform a nail closing operation. It should be noted that the nailing machine of the present invention can be used in the same manner as described above for the operation of extracting nails remaining driven into the board in other operations.

Further, in the above embodiment, the tip of the push pin 10 is configured to protrude from the guide member 5 and to enter the nail hole 13 of the plywood 11. Even if the tip of the pin 10 does not protrude from the guide member 5, the nail 12 can be sufficiently pulled out by the forward force of the pushing pin 10.

(Effects of the Invention) According to the present invention, the following effects can be obtained.

(1) Since the outer shape of the guide member for guiding the forward and backward movement of the push pin is formed in a substantially triangular plate shape with the top portion at the top and the bottom at the back, the tip of the guide member is narrow and laterally protrudes. Since there are no such parts, it is extremely easy to insert the nail into the guide hole, in which the gun body is inclined in the lateral direction and the tip of the bent nail protruding from the plate is inserted into the guide hole.

(2) Also, the guide member is formed in a plate shape, and the orientation of the plate-shaped flat surface is changed to a use state of the nail remover, that is, the gun body is tilted right or left by gripping the grip portion and the nail is tilted. Insert the protruding part into the guide hole, and then set it in a horizontal state that extends left and right with respect to the gun body so that it is parallel to the operation direction of raising the gun body in the original direction. Because it was fixed to the gun body side via the wide part at the rear,
The strength against an operating force such as a bending moment acting on the joint between the guide member and the gun body when the gun body is raised can be more effectively secured. Accordingly, the material can be used more effectively, so that the material cost and weight can be reduced.

(3) That is, in the invention of the first aspect, the outer shape of the guide member is formed into a substantially triangular plate shape, and the plate-shaped flat surface is directed to the gun body side through the wide portion behind the guide member. The simple structure of fixing makes it easier to perform a series of operations such as inserting the tip of the bent nail peculiar to the nail cutter into the guide hole and raising it, and the strength adapted to the operation is improved. It is possible to provide an extremely easy-to-use nail cutter that satisfies effective securing at the same time.

(4) Further, if the apex angle of the substantially triangular shape is set to be large with respect to the outer shape of the guide member so that the extension of the oblique sides on both sides passes outside the width of the gun body, the side corresponding to the oblique side Since the portion can be pushed toward the tip of the nail while sliding against the protruding plate of the nail, the operation of inserting the nail into the guide hole becomes easier.

(5) In the invention of the second aspect, the outer shape of the guide member is tapered, and the trumpet-shaped guide portion is formed inside the tip end of the guide hole formed in the guide member. The point that the bent nail tip is bent by pushing the gun body moderately incline and pushing it to the nail side, in combination with the point that the outer shape of the Since it is guided and raised by the trumpet-shaped guide portion and is very easily introduced into the guide hole, the operation of inserting the protrusion of the nail into the guide hole can be greatly improved.

(6) Further, since the outer shape of the guide member is formed in a tapered shape and the rear portion is fixed to the gun body side, in addition to the ease of inclination of the gun body due to the tapered portion, the fixing portion to the gun body side is formed. Since the cross-sectional area can be increased, sufficient strength can be easily secured at the joint between the guide member and the gun body.

[Brief description of the drawings]

FIG. 1 is a side view of a nail cutter according to an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged side view of the essential part of the nail cutter, partially cut away. FIG. 4 is a side view of a piston with an extrusion pin. FIGS. 5 to 7 are explanatory views showing a nail cutting operation with a part cut away. FIG. 5 shows a state in which the tip of a nail is inserted into a guide hole of a guide member, and FIG. FIG. 7 shows a state in which the nail is pulled straight, and FIG. 7 shows a state in which the nail is pulled out. 8 to 10 are explanatory views of the work of separating a plywood and a pier used as a dam board, FIG. 8 shows a state in which a pier is attached, FIG. 9 shows a state in which a pier is separated,
FIG. 10 shows the state of the nails remaining on the plywood after the separation of the crosspiece. 11 to 14 are explanatory views related to a conventional nail removal operation of nails remaining on plywood after use.
The figure shows a state in which the protruding part of the nail is raised straight, FIG. 12 shows a state in which the head of the nail is lifted, FIG. 13 shows a state in which the plywood is turned over, and the nail puller of the hammer is hooked on the head of the nail, FIG. Indicates a state in which the nail has come off. DESCRIPTION OF SYMBOLS 1 ... Air supply mouthpiece, 2 ... Hose, 3 ... Gun body, 4 ... Cylinder, 5 ... Guide member, 6 ... Guide part, 7 ... Guide hole, 8 ... Trigger, 9 ... Piston, 10 ... Extrusion pin, 11 ... Plywood , 12 ...
Nail, 13 ... nail hole

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Michiharu Obata 2-13-33 Kurohara, Kokurakita-ku, Kitakyushu-shi, Fukuoka (72) Yoshiyuki Okayasu 1-126-5, Shimo-Osaki, Shiraoka-cho, Minami-Saitama-gun, Saitama References JP-A-54-45877 (JP, A) JP-A-3-68785 (JP, U) JP-A-2-274478 (JP, U) JP-A-56-20776 (JP, U) JP-A 50-15729 (JP, U) JP-A 56-2379 (JP, U) Registered utility model 42284 (JP, Z1)

Claims (2)

(57) [Scope of request for utility model registration] 1. A gun body containing driving means driven by operation of an operation unit such as a trigger, a push pin pushed forward by the drive means, and a guide hole for guiding the push pin back and forth. A guide member having a guide member, wherein the push-out portion of the push-out pin is inserted into the guide hole when the push-out pin is retracted, and the push-out pin is advanced through the drive means by operating the operating portion. In the nail puller that pulls out a nail, the outer shape of the guide member is formed in a substantially triangular plate shape with the tip portion of the guide member at the top and the rear portion at the bottom, and the guide member is formed of the plate-shaped flat surface. A nail puller which is fixed to the gun body via a wide portion at the rear of the guide member in such a manner that the nail extends horizontally. 2. A gun body containing driving means driven by operation of an operation unit such as a trigger, an extrusion pin pushed forward by the driving means, and a guide hole for guiding the pushing pin back and forth. A guide member having a guide member, wherein the push-out portion of the push-out pin is inserted into the guide hole when the push-out pin is retracted, and the push-out pin is advanced through the drive means by operating the operating portion. In a nail puller that pulls out a nail, the outer shape of the guide member is formed in a tapered shape with the tip of the guide member as a top,
At the rear, it is fixed to the gun body side,
A nail puller, wherein a trumpet-shaped guide portion is formed inside a front end portion of a guide hole formed in the guide member.