JP2002301670A - Pry bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pry bar suitable for using as a lever. SOLUTION: This pry bar 1 is provided with a gripping shaft part 2, and a pry action part 3 extending from one end of the shaft part 2 and characterized by setting an angle of the action part 3 with respect to the shaft part 2 obtuse. The angle of the action part 3 with respect to the shaft part 2 is preferably 120 deg. to 150 deg.. A mound-like projection part 4 is provided on the back side in the vicinity of the connection part of the shaft part 2 to the action part 3. The projection part 4 desirably has a surface 8 vertical to the action part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crowbar used for leverage, nail cutting, and the like.

[0002]

2. Description of the Related Art The above-mentioned burl is a general construction tool and is used, for example, for setting up a temporary frame for setting concrete into a specific mold. The burl 11 is generally provided with a shaft 12 for gripping as shown in FIG.
And an action portion 13 extending from one end of the shaft portion 12. The action portion 13 is formed in a wedge shape whose thickness gradually decreases in the direction of the distal end, and a V-shaped cut for engaging with a shaft of a nail or the like, not shown, is formed from the distal end. In the burl 11 having the above structure, the angle between the shaft portion 12 and the action portion 13 is substantially perpendicular.

[0003]

The burl 11 is often used as a lever other than a nail remover. For example, when the temporary frame is erected, the action portion 13 is inserted into a gap between the panels constituting the temporary frame, and the shaft portion 12 is rotated rearward.
It is used for the work to shift the panel by leverage principle. In this operation, since the operation portion 13 of the conventional burl 11 extends substantially vertically from one end of the shaft portion 12, when the operation portion 13 is inserted into a gap between the panels, the shaft portion 12 comes close to the panel, As a result, there are inconveniences such as difficulty in work and difficulty in inserting the action portion 13 into the gap between the panels.

[0004] The same applies to work other than the above-mentioned temporary frame setting. In general, when the bur 11 is used as a lever, when the action portion 13 is brought into contact with an object, the shaft portion 12 and the object come close to each other. There are similar disadvantages.

In order to avoid such inconveniences, it is necessary to separately provide a bar suitable for use as a lever together with the bar 11 for nail removal, which increases the burden on the operator.

The present invention has been made in view of these inconveniences, and has as its object to provide a crowbar suitable for use as a lever.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and is a burl having a gripping shaft portion and an operation portion extending from one end of the shaft portion. Is an obtuse angle with respect to the shaft portion. Here, the “angle of the acting portion with respect to the shaft portion” means an angle of a center line (approximate to a straight line; the same applies hereinafter) of the acting portion with respect to the central axis of the shaft portion.

According to the crowbar, since the angle between the acting portion and the shaft portion is obtuse, when the crowbar is used as a lever, the shaft portion is kept at a predetermined angle and a predetermined distance from the target object. The part can abut on the object. For example,
When the working part is inserted into the gap of the panel during the installation of the temporary frame, the shaft part is inclined at a predetermined angle with respect to the panel surface,
At the other end (rear end) of the shaft, the distance from the panel is relatively large. Therefore, the operation of inserting the action portion into the gap of the panel is facilitated, and the operation of rotating the shaft after the action portion is inserted is also facilitated.

In the case where the burl is used as a nail remover, when the action portion is engaged with the shaft of the nail that has been driven, the shaft portion is inclined at a predetermined angle rearward with respect to the driving surface,
The nail is pulled out by pressing this shaft portion toward the sectional view. Thus, the nail removal operation is also facilitated.

In the crowbar, the angle of the working portion with respect to the shaft is preferably 120 ° or more and 150 ° or less. By setting the included angle between the shaft portion and the action portion in the above range, the above-described good workability when used as a lever can be effectively exhibited.

[0011] Further, it is preferable that a projection is provided on the back side (large intersection angle side) near the connecting portion between the shaft portion and the operating portion, and the mountain-shaped projection has a surface perpendicular to the operating portion. . here,
The “plane perpendicular to the acting portion” means a surface perpendicular to the center line of the acting portion. According to this means, the mountain-shaped projection serves as a fulcrum, and the functionality and workability as a nail puller, lever, and the like are improved. In addition, a plane perpendicular to the acting portion (hereinafter referred to as a “perpendicular surface to the acting portion”).
Therefore, by hitting a vertical surface with respect to the action portion with a hammer or the like, the action portion is formed at a target portion (for example, a gap between panels constituting a temporary frame, a gap between a nail head and a casting surface). (E.g., a gap).

Further, it is preferable that the action section is formed in a thin and wide wedge shape. Here, “thin and wide” means
This means that it is thinner and wider than a conventional general bar operating portion (nailing portion). According to this means, it is easy to insert the action portion into the narrow gap, which is suitable for, for example, an operation of displacing the panel when setting up the temporary frame.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings as appropriate. 1 is a perspective view showing a burl according to an embodiment of the present invention, FIG. 2 is a side view showing the burl of FIG. 1, and FIGS. 3 (a) to 3 (d) show how to use the burl of FIG. FIG.

A burl 1 shown in FIG.
And a mountain-shaped projection 4.

The shaft 2 is a rod-shaped body that is gripped by an operator and applies a force. The cross-sectional shape of the shaft portion 2 is not particularly limited, but is preferably a rectangular shape whose corners are rounded from the viewpoints of directional control of the action portion 3 and ease of gripping. The rear end portion 5 of the shaft portion 2 is formed in an acute conical shape whose diameter decreases toward the end, and is used for nailing, drilling, fastening with a wire, and the like. Further, a through-hole 6 is formed in the shaft portion 2 so that the shaft portion 2 is provided for convenience such as attaching a strap, storing on a wall, and the like.

The action portion 3 extends from the tip of the shaft portion 2 and is formed in a wedge shape whose thickness gradually decreases in the direction of the tip.
The action section 3 is thinner and wider than a general nail removal action section. Further, the action section 3 includes
A V-shaped cut 7 for engaging the nail shaft for nailing is formed in the direction of the shaft 2 from the tip.

In the burl 1, the shaft portion 2 of the action portion 3
Is formed so as to be obtuse, and a wedge surface of the operation section 3 is perpendicular to a plane including the central axis of the shaft section 2 and the center line of the operation section 3.

The lower limit of the angle X is preferably 120 °, particularly preferably 130 °. On the other hand, the upper limit of the angle X is preferably 150 °, particularly preferably 140 °. This is because by setting the angle X to be equal to or greater than the lower limit, good workability when used as a lever can be effectively exhibited. Conversely, when the angle X exceeds the upper limit, the shaft 2 This is because the angle range in which can be rotated to the back side and the operating range of the distal end of the action section 3 are reduced, and the workability when using as a nail remover is reduced.

The mountain-shaped protrusion 4 is provided on the back side near the connecting portion between the shaft portion 2 and the action portion 3. The mountain-shaped projection 4 serves as a fulcrum, and the burl 1 is favorably used as a nail remover and lever. The mountain-shaped projection 4 has a vertical surface 8 with respect to the action portion 3 and a vertical surface 9 with respect to the central axis of the shaft portion 2.

The size of the crowbar 1 having the above structure is not particularly limited, and can be appropriately designed in consideration of the intended use, the strength of the material, and the like. For example, as for the size of the bur 1 for mounting the temporary frame, the length of the shaft 2 is about 250 mm, and the cross-sectional shape of the shaft 2 is about 15 mm × 12 m.
m, the length of the action part 3 is about 95 mm, the maximum width of the action part 3 is about 25 mm, the thickness of the maximum width part of the action part 3 is about 5 mm,
The height of the mountain-shaped projection 4 is about 25 mm.

The material constituting the crowbar 1 is not particularly limited as long as it has a predetermined strength required for nailing, levering, etc., for example, carbon tool steel (SK material), alloy tool steel (SKS material, SKD material, SK
T material).

The method of manufacturing the burl 1 is not particularly limited, and generally, integral molding by hot die forging is employed.

Next, a method of using the burl 1 will be described. First, a method of using the burl 1 as a nail remover will be described. As shown in FIG. 3A, by hitting the vertical surface 8 of the mountain-shaped projection 4 with respect to the action portion 3 with a hammer 23 or the like, the bur is formed in the gap between the head 21 a of the nail 21 and the driving surface 22. 1 is inserted. At this time, since the action section 3 is formed thin and wide, the insertion of the action section 3 is easy. In this state, since the shaft portion 2 of the burl 1 is inclined rearward, the nail 2 is easily gripped by the shaft portion 2 and pushed downward and downward.
1 can be omitted.

Further, the nail 21 is directly tightened with a nail or a hammer 23 or the like.
As shown in FIG. 3 (b), as a method for nailing a place where it is difficult to drive the nail, the rear end 5 of the shaft 2 of the crowbar 1 is vertically attached to the head 21a of the nail 21. Abutting, nailing by beating the vertical surface 9 against the shaft portion 2 with a hammer 23 or the like,
Nail fastening and the like can be easily performed.

Further, an operation of shifting the panel 24 forming a temporary frame along the panel surface by using the lever as a lever will be described. First, as shown in FIG. 3C, the action portion 3 of the burl 1 is inserted into the gap of the panel 24. Shaft 2 of bar 1
In this state, the shaft 2 of the crowbar 1 is inclined at a predetermined angle with respect to the panel 24, and the tip of the shaft 2 is closer to the panel. As a result, the operation of inserting the action portion 3 of the burl 1 into the gap of the panel 24 and the operation of rotating the shaft portion 2 to the back side to shift the panel 24 are facilitated. Further, since the action portion 3 is formed thin and wide, easiness of the insertion of the action portion 3 and slimming of the panel 24 is promoted also from this point.

On the other hand, as shown in FIG. 3 (d), the operation of shifting the panel 24 perpendicularly to the panel surface and correcting the adjacent panels 24 to be flush with each other is as follows: The nail 21 is attached and the panel 24b on the near side is
By engaging the action portion 3 of the crowbar 1 from the side, and rotating the shaft portion 2 of the crowbar 1 backward in this state, the adjacent panels 24a and 24b are relatively displaced from each other, and are flush with each other. Can be modified. In this operation, since the action portion 3 of the crowbar 1 extends at an obtuse angle with respect to the shaft portion 2, the engagement with the nail 21 is easy, and the workability of correcting each panel 24 to the same level is achieved. Promoted.

The burl according to the present invention is not limited to the above embodiment. For example, it is possible to form a wedge-shaped nail pullout at the rear end 5 of the shaft 2.

[0028]

As described above, according to the burl of the present invention, since the action portion extends at an obtuse angle with respect to the shaft portion, the workability is particularly good when used as a lever.
For example, it is suitable for installing a temporary frame.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a burl according to an embodiment of the present invention.

FIG. 2 is a side view showing the burl of FIG. 1;

3 (a) to 3 (d) are explanatory views showing how to use the burl of FIG. 1;

FIG. 4 is a side view showing a conventional general burl.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bar 2 ... Shaft part 3 ... Working part 4 ... Mountain-like projection part 5 ... Rear end part 6 ... Through hole 7 ... Cut 8 ... Working part 9 ... Vertical surface to shaft 21 ... Nail 21a ... Head 22 ... Punching surface 23 ... Hammer 24 ... Panel 24a ... Panel 24b ... Panel

Claims (4)

[Claims] 1. A crowbar comprising a gripping shaft portion and a working portion extending from one end of the shaft portion, wherein the angle of the working portion with respect to the shaft portion is obtuse. 2. The angle of the working portion with respect to the shaft portion is 120.
The crowbar according to claim 1, which is not less than 150 ° and not more than 150 °. 3. The device according to claim 1, further comprising a mountain-shaped projection on a back side near a connecting portion between the shaft portion and the operation portion, wherein the mountain-shaped projection has a surface perpendicular to the operation portion. Item 2. A crowbar according to item 2. 4. The crowbar according to claim 1, wherein the action portion is formed in a thin and wide wedge shape.