JPH09131670A - Crowbar for pulling out long nail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To pull out a long nail efficiently when a house is dismantled and the like. SOLUTION: A straight and long crowbar 3 is slightly bent back or is continuous from a position close to it with at least most of it in pipe shape in continuation with a nail pull-out action section 1 having the nail pull-out action section 1 due to a narrow V-shaped cut-in at its terminal and in continuation with a support point moving section 2 which is largely curved to about one-fifth or one-fourth circular arc by a radius of at least about one or 1.5 times a long nail to be pulled out to constitute them integrally. A tip section 4 of the crowbar 3 is connected with a tip side face 5 of the support point travel section 2 by using a reinforcing steel wire 6 such as piano wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burl for removing long nails driven into old materials, which is particularly required for demolition of houses and the like.

[0002]

2. Description of the Related Art Conventionally, the shape of a burl that has been generally used is that a narrow fulcrum part that is slightly curved is formed from a nail pulling action part by a narrow V-shaped cut that sandwiches the nail head.
I bent it into a bend-back shape and then connected it to a long lever.

[0003]

This type of burl is made by cutting a thick round or octagonal iron bar into a nail-pulled shape.
Due to its shape, which itself has a considerable weight, and the length of the fulcrum that continues from the nail pulling action part is short, it is not possible to pull out long nails at once. I couldn't pull it out without putting a pillow on it and pulling it out again. In addition, since the shape from the nail pulling action part to the L-shaped fulcrum is almost straight, the L-shaped corner is used as the fulcrum even at the start of the nail pulling, which requires the most force, and a considerable force is required. Was there. Therefore, in the work of pulling out a large number of long nails such as the dismantling of a house, a bar that is lightweight and easy to pull out and can pull out even a long nail at once has been demanded.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to solve these problems, in which the tip portion for inserting the nail under the head of the nail and pulling out the nail is similar to the conventional one. Iron nail pulling action part 1 with narrow V-shaped notch
And Subsequent to the nail pulling action part 1, with a radius of about 1 to 1.5 times the length of the long nail that is supposed to be pulled out, it is largely curved to about 1/5 arc to 1/4 arc and is a fulcrum. A moving part 2 is formed, and a bar-shaped lever bar 3 is integrally formed following the letter shape from the end thereof. The V-shape is used to express the relative angular relationship between the fulcrum moving part 2 and the lever 3, and the end of the fulcrum moving part 2 is bent once and then the lever is moved at the same relative angle. 3 may be integrally configured, and the angle may be a vertical L-shape.

[0005]

Since the present invention has such a structure, when the nail pulling action portion 1 is held below the nail head and the upper end of the lever 3 is used to pull out the nail, as the nail comes out, the fulcrum s,
That is, the contact point with the wood gradually moves on the arc of the fulcrum movement part 2 sequentially from the position closest to the action point p existing in the nail pulling action part 1 and moves away from it. The length of pulling up the nail during this period is equal to or longer than the length of the nail. Therefore, even long nails can be completely pulled out during this fulcrum movement.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, an embodiment of the present invention will be described. An iron nail pulling action portion 1 having a narrow V-shaped notch.
In addition to the above, the fulcrum moving portion 2 having a radius of at least 1 to 1.5 times the length of the long nail to be extracted and having a radius of about 5 to 1/4 is bent, and is slightly bent from the end portion. From the position at which the lever is returned or near it, at least most of the straight long lever bar 3 continues as a pipe and is integrally configured. Next, the tip portion 4 of the lever 3 and the vicinity of the tip side surface 5 of the fulcrum moving portion 2 are connected by a reinforcing steel wire 6 such as a piano wire.

Instead of the reinforcing steel wire 6, a reinforcing plate 7 may be vertically erected from both side surfaces of the fulcrum moving part 3 from both end side surfaces 5 of the fulcrum moving part 2 to the tip part 4 of the lever 3.

Further, a synthetic rubber anti-slip bottom 8 may be fixed to the bottom of the fulcrum moving portion 2, that is, a portion in contact with the timber by adhesion or the like.

[0009]

In the process of pulling out a long nail according to the present invention, as shown in FIG. 3, the fulcrum s position at the beginning of pulling out the nail is the action point p.
The fulcrum s moves closest to the (peg pulling action part 1) and in proportion to the change in the angle of the lever 3, so that the fulcrum s moves away from the action point p on the arc of the fulcrum moving part 2. This is rational and easy, consistent with the fact that when pulling out an old nail, it requires the most force at first and less force is required as it pulls out. Moreover, since the radius of the circular arc surface of the fulcrum portion 3 is sufficiently long, which is about 1 to 1.5 times the length of the long nail, it is possible to pull up more than the length of the nail depending on the moving angle of the lever 3, which is long. The nail can be completely removed. Therefore, unlike the conventional type of burl, it is no longer bothered to put a pillow on the fulcrum and pull it out again.

Moreover, the thinning of the fulcrum moving portion 2 accompanying the reinforcement by the reinforcing steel wire 6 or the reinforcing plate 7 and the pipe of the lever 3 make the long nail removing bar according to the present invention have sufficient nail removing ability. It has become possible to realize weight reduction of about 30-40%.

Therefore, it is possible to pull out nails in a single operation without needing to insert a pillow or the like for removing long nails when dismantling a house or the like, and reducing physical weight to reduce physical fatigue, resulting in work efficiency. Can be expected to improve. Further, in the case where the bottom surface of the fulcrum moving portion 2 is provided with a slip-resistant bottom 7 made of synthetic rubber, in order to prevent slippage with the wood at the time of pulling out nails, in particular, in the case of pulling out nails driven obliquely, Unlike the conventional crowbar, when the fulcrum moving part 2 is applied to the curved surface of a round material or the corner surface of a square material to pull out a nail, slippage at the fulcrum s position is prevented and work efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a partial cross section of an embodiment of the present invention.

FIG. 2 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 3 is an explanatory diagram of nail extraction according to the present invention.

[Explanation of symbols]

 1 nail pulling action part 2 fulcrum moving part 3 lever bar 4 tip part 5 tip side face 6 reinforcing steel wire 7 reinforcing plate 8 anti-slip bottom s supporting point p operating point

Claims (5)

[Claims] 1. A nail pulling action portion 1 by a narrow V-shaped notch.
In the burl having the end at the end, the end part is curved largely by about 1/5 arc to 1/4 arc by a radius of about 1 to 1.5 times the length of the long nail that is supposed to be pulled out. Continuing on from the fulcrum moving part 2, the bar-shaped lever 3
Bar for long nail pulling, characterized by being configured integrally. 2. The long nail pulling bar according to claim 1, wherein at least most of the lever bar 3 has a pipe-like structure. 3. The long nail pulling bar according to claim 2, wherein the tip portion 4 of the lever 3 and the tip side portion 5 of the fulcrum moving portion 3 are connected by a reinforcing steel wire 6. 4. Reinforcement plates 7 which are vertically erected from both side surfaces of the fulcrum moving part 3 are provided from both tip side parts 5 of the fulcrum moving part 2 to the tip part 4 of the lever 3. Two
Bar for long nail pulling. 5. The long nail removing crow according to claim 1, 2, 3 or 4, wherein a synthetic rubber anti-slip bottom 7 is provided on the bottom surface of the fulcrum moving part 2.