JPH03166069A - Nail pulling method and nail puller thereof - Google Patents

Abstract

PURPOSE:To perform a nail pulling work mechanically with a high efficiency by making a nail pulling machine a gun type utilizing a compressed air. CONSTITUTION:A machine is carried by gripping a gun main body 1 and the guide pipe 6 thereof is fitted to the projection part of a nail 12 by inserting the pipe 6 from the tip side into the projection part of the nail 12 left driven to a plywood 11, etc. Thereafter, the projection part of the nail 12 is raised with a lever, the nail 12 and guide pipe 6 made in the orthogonal direction with the face of the plywood 11, etc. A piston with an extrusion pin 10 is then advanced by a compressed air on pulling a trigger 7, the nail 12 is pushed along the guide pipe 6 and the nail hole 13 of the plywood 11, etc., by the extrusion pin 10 and is extruded from inside the nail hole 13 thereof, and the nail pulling work is performed.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is based on the invention, which is applied to the plywood of the weir board of the seventh formwork after dismantling the formwork assembled and used in the construction of a concrete building. This invention relates to a nail pulling method that mechanically performs a so-called nail closing operation, in which remaining nails are removed, and a nail pulling machine used therein.

(Prior Art) When constructing a concrete building, formwork is assembled, concrete is poured, and once the concrete has solidified, the formwork is dismantled. Construction that involves this process repeatedly is called formwork construction.

During the dismantling work of the formwork, from the state where the crosspieces (B) are attached to the plywood (A) with nails as shown in Figure 8, the crowbars (D) are removed as shown in Figure 9. plywood(
Drive it between the plywood (A) and the crosspiece (B), and pry the crosspiece (B) down with the crowbar (d) to separate the plywood (A) and the crosspiece (B). After that, the plywood (A) is arranged, stacked, and moved in that state.

The above work is a little rough work as it involves handling heavy parts. For this reason, the nails (/→) that remain driven into the plywood (A) are different from new ones, as there are almost no nails that are standing straight, and there are ones that are bent or badly bent, as shown in Figure 10. It is bent and stuck to the plywood (A).

On the other hand, every time from the above-mentioned repeated formwork dismantling work to the next assembly work, the nails (/c) remaining on the plywood (a) of the formwork weir board are removed. There is work to be done.The number of nails (/→) to be removed is usually 15 to 20 from 3x6 plywood (A).

Therefore, in the past, as shown in Figure 10, the nails were bent and stuck to the plywood (A), or the bent nails (/→ Raise it straight using the no-ma (he) with the nail (e) attached. Then, in order to hook the nail puller (e) of the hammer (he) onto the head (g) of the nail ←→, as shown in Figure 12. nail(
Hit the tip of /→ with No Nma (he) to make the head of nail ←→ (
(g) above the plywood (a).

Next, as shown in Figure 13, turn over the plywood (A),
Hook the nail puller (E) of the hammer (F) onto the head (G) of the nail ← and pull up the nail ←1 with the hammer (F), and the
As shown in the figure, the nail (/→) is removed from the plywood (A).

The above operation is repeated for each nail on the plywood (A) to finish the nail.

(Problems to be Solved by the Invention) The above-mentioned conventional nail closing work is as follows: (1) The nails are bent and stuck to the plywood (A), or the bent nails are removed with a hammer (F). The nail e→ is struck many times with a hammer to make it almost straight, which requires a lot of effort and time.

(2) Since the work is carried out while turning over the large and heavy plywood H), the operation is labor intensive and the work efficiency is low.

There are problems with these points.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention utilizes the principle of a conventional nail gun, which is to drive nails using compressed air, to drive nails into plywood, etc. The nail removal process is performed mechanically by pushing out the stuck nail using compressed air.

A cylinder (4) is installed at the top of the gun body (3) which connects the air supply mouthpiece (1) to the compressor via a hose (2).
), and a guide pipe (6) whose front mouth edge is formed into a taber (5) with a thin wall on the tip side protrudes from the upper front part, and inside the cylinder (4), the gun body (3) is inserted. The piston (8) moves forward or backward with compressed air from the compressor by alternately pulling or releasing the trigger (17).
), and the piston (8) is fitted with the base of a push-out pin α0 that operates within the guide pipe {6} until the tip protrudes from the base within the guide pipe (6) to the distal end side by an appropriate length. Hold and carry the configured nail puller and cut the plywood (11)
After fitting the guide pipe (6) of the nail puller into the protruding part of the nail Q3 that remains driven into the nail, etc., pry up the nail puller and attach the guide pipe (6) and nail 0 to the plywood. a
Then, pull the trigger (7) of the nail puller and push out the nail α2 from the needle hole α3 VCG through the plywood αυ etc. using the extrusion pin αG to pull out the nail.

(Function) Hold the gun body (3) and carry the machine, and insert the guide pipe {6} into the plywood aO, etc. with the remaining nail V.
Insert the tip into the protruding part of the nail Oa from the tip side and fit it into the protruding part of the nail Oa, then pry up, nail a and guide pipe (6
) in a direction perpendicular to the surface of the plywood (11), etc., and raise the protruding part of the nail α.

Next, when the trigger (7) is pulled, the piston (8) with the extrusion pin al is moved forward by the compressed air, and the extrusion pin (II) moves the nail a3 into the guide pipe (6) and the plywood α.
The nail is removed by pushing it along the needle hole α3 such as D and pushing it out from within the needle hole a3.

(Example) To explain the structure of one embodiment of the present invention shown in Figs. 1 to 7, (3) is the gun body of the nail puller, and the air supply mouthpiece (1) at the lower end is connected to the hose (3). According to 2), although not shown, it is connected to a compressor, a cylinder (4) in the front and back direction is provided in the upper part, and the front mouth green part is formed in the front of the upper part into a conical taper (5) with a thin wall on the tip side. The guide pipe (6) is fixed so as to protrude concentrically with the cylinder (4). (7) is the trigger of the gun body (3), (8) (
9) to fix the base to the piston (8).

When the trigger (11) of the gun body (3) is pulled, compressed air enters the rear part of the cylinder (4) from the air supply mouthpiece (1) through the gun body (3), and the ejector pin αO The piston (8) with the push-out pin 0I advances through the guide pipe (16).
) advances and the ejector pin (1
The tip portion forming the constriction (9) of 1 protrudes by an appropriate length, such as 1213 mm, which is the thickness of the plywood U. Then the trigger (7
), the compressed air will flow oppositely to the cylinder (4).
), the piston (8) with the ejector pin α0 moves back as shown by the dotted line in Fig. 3, and the ejector pin a
The tip with the constriction (9) of 1 is a guide vipe (6).
so that it is located within the base of the

U is the plywood used for the weir board of the concrete formwork, α2 is the nail remaining after removing the crosspiece of plywood aυ after the formwork has been dismantled, and is still driven into plywood αD, a3 is the nail a3 on the plywood (I1)
This is a needle hole made by driving the needle.

Next, its effect will be explained. While holding the gun body {3} and carrying the machine, place the guide pipe (6) opposite the tip of the nail (Lz) remaining on the plywood (l1) as shown in Figure 5, and then As shown in the figure, after inserting the guide pipe (6) into the protruding part of the nail α2, pry it up, and insert the nail α with the illusion perpendicular to the surface of the plywood αD. Raise the protruding part almost straight.

Next, when the trigger (7) is pulled, the piston (8) with an ejector pin (11m) is advanced by the compressed air, and the ejector pin α0 moves the nail 0 through the guide pipe (6) and the needle hole α3.
1C. After pushing the nail a3 out of the needle hole 03, the tip of the push-out pin α enters the needle hole αJ from the guide pipe (6) as shown in FIG. , Nail 0 protrudes downward from the plywood (19) and the nail removal operation is performed.

Thereafter, when the trigger (7) is released, the piston (8) with the push-out pin aO is retracted by the compressed air in the opposite direction to the above, and is returned to the state shown by the dotted line in FIG. 3 and held there.

The above operation is repeated for each nail of each plywood αD to finish the nails.

Note that the constriction (9) of the extrusion pin αυ may have a conical shape with a small diameter on the tip side instead of having the same thickness as described above, or may function in the same manner as described above even if it is not provided.

On the other hand, the guide pipe (6) is not limited to the structure of the embodiment.

Further, the present invention can be implemented in the same manner as described above for removing nails that remain driven into boards other than plywood.

(Effects of the Invention) The nail pulling method and the nail pulling machine of the present invention have the following remarkable effects.

(1) The nail extractor is a gun type that uses compressed air to remove nails remaining on plywood, etc. Therefore, (a) Nail extraction work is performed mechanically, which not only improves work efficiency but also reduces labor and saves labor.

(b) Since the machine is light and small, it is easy to handle and even a woman can work on it.

(c) Easy to operate because you can work by simply holding the gun body and pulling the trigger.

(2) Work can be done without turning the plywood etc. in one direction, which saves time and improves work efficiency.

(3) The front edge of the guide vibrator is tapered so that the tip end becomes thinner, and the guide pipe is inserted into the protrusion of the nail. Therefore, (a) Even if the protruding part is bent and stuck to plywood or the like, the tip of the nail can be easily scooped up by the guide pipe and the protruding part of the nail can be placed inside the guide pipe.

(Example) When the machine is closed and the guide pipe is placed perpendicular to the surface of the plywood etc., the guide pipe allows the nail to be raised straight, making the operation easy, quick and accurate.

(4) Since the ejector pin moves within the guide pipe, the ejector pin is reliably supported.

(5) Since the push-out pin protrudes from the guide pipe and enters the needle hole in the plywood, etc., and pushes out and removes the nail driven into the needle hole, nail extraction work can always be performed accurately.

[Brief explanation of the drawing]

Fig. 1 is a side view of a nail puller showing an embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is an enlarged side view of the main parts of the same, Fig. 4 is a side view of a piston with an extrusion pin, Figures 5 to 7 are partially cutaway side views for explaining the work. Figure 5 shows the state in which the guide pipe is inserted into the protrusion of the nail, Figure 6 shows the state in which the protrusion of the nail is raised straight, and Figure 6 shows the state in which the guide pipe is inserted into the protrusion of the nail. Figure 7 shows the state of nail extraction. Figures 8 to 9 are side cross-sectional views explaining the work of removing the crosspieces of the plywood weir board. Figure 8 shows the state in which the crosspieces are installed, Figure 9 shows the state in which the crosspieces have been removed, and Figure 10 shows the state in which the crosspieces are removed. Each figure shows the condition of the nails remaining on the plywood after removal. 1st
Figures 1 to 14 are side cross-sectional views illustrating a conventional process for removing nails remaining on plywood. Figure 11 shows the nail with its protruding part straight up, and Figure 12 shows the nail with its head raised. , Fig. 13 shows the state in which the plywood is turned over and the nail puller of the hammer is hooked onto the head of the nail, and Fig. 14 shows the state in which the nail has been pulled out. (1)...Air supply cap, (2)...Hose, (3)...
...Gun body, (4)...Cylinder, (6)...Guide pipe, (7}...Trigger, {8}...Piston, (10...Eject pin, (II)...・Board, 0...
・Nail, country 0...needle hole, O Z diagram O l 3 diagram l + diagram l1

Claims (2)

[Claims] (1) Connect the air supply mouthpiece to the compressor with a hose A cylinder is provided at the top of the gun body, and a guide pipe with the front mouth edge tapered to become thinner at the tip is provided protruding from the top front, and inside the cylinder The piston is provided with a piston that is moved forward or backward by compressed air from the compressor by alternately pulling or releasing the trigger of the gun body, and the piston has a tip that moves from the base in the guide pipe to the tip side as appropriate. Hold and carry a nail puller, which is constructed by attaching the base of a push-out pin that operates inside the guide pipe until it protrudes, and insert the nail puller into the protruding part of the nail that has been driven into plywood or the like. After fitting the guide pipe, pry up the nail puller so that the guide pipe and the nail are perpendicular to the surface of the plywood, etc., then pull the trigger of the nail puller and use the push-out pin to pull the nail out of the way. A nail extraction method characterized by pushing the nail out of plywood, etc. along the needle hole. (2) Connect the air supply mouthpiece to the compressor with a hose A cylinder is provided at the top of the gun body, and a guide pipe with a tapered front mouth edge that becomes thinner on the tip side protrudes from the top front, and inside the cylinder. The piston is provided with a piston that is moved forward or backward by compressed air from the compressor by alternately pulling or releasing the trigger of the gun body, and the piston has a tip that moves from the base in the guide pipe to the tip side as appropriate. 1. A nail extractor, characterized in that a base of a push-out pin is attached that operates within the guide pipe until the length protrudes.