JPS59122632A - Handle for manual tool - Google Patents

Abstract

PURPOSE:To attain the increase of strength and the weight reduction of a handle for a manual tool by a method in which the sectional outside of the handle body is formed of a round metal tube, and an expanded portion is formed in a place where stress is to be concentrated on the place continuing to the connection position of the blade at the least in the handle body. CONSTITUTION:A blade 3 is provided with a fitting cylinder 31 having the same outside diameter and thickness as those of the handle body 1, and a reinforcing lever 4 is made of a cylinder 31 with a tapered tip of an outside diameter enough to fit on the handle body 1, and its tip end is closed. The tip end of the lever 4 is fitted by half into the cylinder 31, the rear of the lever 4 is fitted by half into the body 1, and the body 1 and the cylinder 31 are butted and welded with the lever 4 for fixation. An expanded portion 11 is formed with a round and equal-diameter outside over a fixed distance shape from a position near the blade 3 side rather than the place (a) where bending moment is to be concentrated during the working period to the basal portion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a handle for a hand tool such as a shovel or a shovel, and more particularly to a handle for a hand tool consisting of a handle body having a predetermined length.

Generally, with this type of handle, a grade is connected to the handle body, the tip end of the grade is inserted into the workpiece such as earth and sand, and the gripping body is operated to lift the workpiece with the grade. In this case, the heavier the workpiece near which the tip of the grade penetrates, the more firmly the tip of the grade is supported by the workpiece, and when the grip body is operated, the blade of the handle body A large bending stress will be concentrated at the connection position.

Therefore, conventionally, the mounting tubes of the blades are arranged at the end of the handle main body in a butting manner, and reinforcing rods are inserted and reinforced on both sides of the abutting portion in the length direction, or,
Grade attachment tubes are stacked inside the end of the handle body, and a reinforcing rod is fitted into the attachment tube to reinforce the attachment tube.

However, in either case, due to the operation of the grip, the proximal portion of the handle body that is continuous with the connection position with the grade comes into pressure contact with the reinforcing body or the proximal end of the grade mounting tube, causing bending stress. However, after all, it is important to concentrate on
The above-mentioned problems cannot be fundamentally solved.

An object of the present invention is to use a metal tube as the handle body, and to increase the stress concentration position continuous to the grade connection position, so that even if a small diameter metal tube is selected, the bending moment caused by the grip body will not be affected around the grade connection part. The object of the present invention is to provide a handle for a hand tool that can have sufficiently high strength and can also be made lightweight.

The structure of the present invention includes a shovel that fits from a handle body of a predetermined length;
A handle for a manual tool such as a shovel, wherein the handle body is formed of a metal tube having a circular cross-sectional outline, and an enlarged portion is formed at least at a stress concentration position continuous to the grade connection position of the handle body. It is characterized by this.

Embodiments of the present invention will be described below based on the drawings.

What is shown in Figures 1 and 2 is a handle for a shovel. In Figures 1 and 2, (1) is a handle body of a predetermined length, and (2) is one end of this handle body (1). The grip body is attached to the handle body (1), and the grade (3) is attached to the other end of the handle body (1).
) is formed by a metal tube with a circular cross-sectional outline, and
The handle body (1) is formed to form an enlarged portion (11) at a stress concentration position that is continuous with the grade (3) connection position. The grade (3) is connected to the end of the handle body (1) via a reinforcing rod (4), and the grade (3) has the same outer diameter and the same outer diameter as the handle body (1). It is equipped with a thick mounting tube (31), and the reinforcing rod (4) has a cylindrical shape with an outer diameter that can be fitted into the mounting tube (31) and the handle body (1), The reinforcing rod (4) has a tapered shape and a closed tip, so that the tip half of the reinforcing rod (4) is attached to the mounting tube (31).
), then fit the rear half of the reinforcing rod (4) into the end of the handle body (1) to connect the handle body (1) and the grade (3) mounting tube (31). Matching 1. ? -1 is to be fixed together with the reinforcing rod (4) by welding.

In this way, the mounting tube (3) of the handle body (1) and the blade (3)
7. Bending moment due to work is applied to the connection position with 1). 7. Rear part (4) of reinforcing rod (4) in handle body (1)
1) Bending stress is concentratedly applied to the position (a) where the adjacent parts are in pressure contact.

The one shown in FIGS. 1 and 2 is the handle body (
1), the position (a
) The enlarged portion (2) is formed to have a circular cross-sectional shape and an equal diameter over a certain distance toward the hand side from a position slightly closer to the grade (3) side than the reinforcing rod (4). ) the road half on the rear end side is the ampullae (11) on the position (a) side.
This is done to strengthen the structure along the lines.

Therefore, the thickness of the handle body (1) before the bulk processing is tl, the average diameter of the inner and outer diameters is dl, and the enlarged part (
11) Thickness 1. ((1,), the average diameter of the inner and outer diameters is d, (') d, ), and the handle body (1)
Assuming that the cross-sectional area does not change before and after extensive machining, the following relationship holds true: πd,t, = πd,t, Therefore, d mountain = d,t.

By the way, the metal tube used for the handle body (1) has an outer diameter of 8ON and a thickness of 1.2MM, for example, where the thickness value with respect to the average diameter is extremely smaller than 1. Therefore, the above relational expression When the handle body (1) is processed to a large extent and the average diameter is increased by a certain percentage A, for example 10%,
The thickness is reduced by the same percentage as the above-mentioned constant percentage, for example, by 10%.

In addition, the section modulus of a bone exhibiting an internal cross-sectional shape is approximately 0.8 Da' t when the value of the thickness t relative to the average diameter Da of the inner and outer diameters and d is extremely smaller than 1. .

Therefore, the section modulus of the handle body (1) before and after the extensive processing is approximately 0, respectively, since the value of the thickness relative to the average diameter of the metal tube used is extremely smaller than 1.
8d, 't, , 0, 8d, "t", and therefore, each bending stress concentration position (a) of the handle body (1) t-those that have not undergone extensive processing and those that have undergone extensive processing (a, therefore,
When the average diameter of the handle body (1) is increased by the certain percentage, for example, 10%, as described above, and the thickness is decreased by the same percentage, for example, 10%, the bending stress concentration position (a)
The bending stress applied to y is reduced by the same percentage as the constant percentage, for example, by 10%.

Therefore, specifically, as the metal tube used for the handle body (1), a tube with a smaller diameter than the normally used predetermined tube diameter, for example, the tube in 34 countries, for example, 32 m and a thickness of 1.2 rmQ, is used, and the bending application concentrated position is used. (a) over the certain distance including
The curve is expanded to a diameter of, for example, 35.2 mm, which has sufficient strength against the moment) M, and the expanded portion (11
).

In the above configuration, the tip of the grade (3) attached to the handle body (1) is thrust into a workpiece such as earth and sand, the grip body (2) is actuated, and the grade (3) is
), when the workpiece is lifted up by the tip of grade (8), the workpiece near where the tip of grade (8) penetrates is heavy, and the tip of grade (3) is firmly supported by the workpiece. Even when the handle body (1) is in a state where The enlarged portion (11) including the bending stress concentration position (a) that is continuous to the reinforcing rod (4)
The upper half of the end side is reinforced along the length of the connecting portion, and the outer diameter is also reinforced in proportion to the increase in the outer diameter from the connecting portion.

Therefore, by operating the grip body (2), the handle body (1)
Even if a large bending moment is applied to the connection part with grade (3) and the part continuous to this part, it can be sufficiently resisted and the work can be carried out without any problem.

Furthermore, by providing the enlarged portion (2) up to the grip position halfway in the length direction as shown in FIGS. 1 and 2,
The grip part can also be reinforced.

In the above explanation, the enlarged part (11) is made to have an equal diameter along the entire length, but since the moment applied to each part of the handle body (1) in the length direction becomes smaller toward the proximal side, this bending Depending on the decreasing state of the moment, the enlarged portion (11) may be formed so that the enlarged ratio becomes smaller as it goes toward the hand side, as shown in FIG. 8.

In addition, in the above explanation, the handle body (1) is graded (3).
The grade (3) mounting tube (31) was installed in the end of the handle body (1) twice as shown in Figures 4 to 6. When applied to a structure in which the reinforcing rod (4) is inserted into the mounting tube (31) and reinforced, the handle body (1) is
It is formed at a certain distance from the proximal end of the mounting tube (31) so as to be along the main part (2).By doing so, the handle body (1) is reinforced by the reinforcing rod (4) an enlarged part (11) including a connecting part by a mounting tube (31) and a stress concentration position (a) continuous to the part;
This can be sufficiently reinforced together with the reinforcement by the attached part of the mounting tube (31), and it can withstand the large bending moment caused by the operation of the grip rest (2). 11 In fact, they are made to oppose each other.

The enlarged portion (11) is connected to the handle body (1) and the mounting tube (3).
It can be formed arbitrarily depending on the connection structure with 1), and can exhibit the same effects as those described above.

In addition, in any of the embodiments described above, if the cross-sectional outline of the enlarged portion (11) and the grade (3) mounting tube (31) is made non-circular such as an ellipse, the section modulus on the load direction side is further increased. Increases in size and strength.

Further, although the above embodiments are applied to a shovel, it goes without saying that the present invention can also be applied to shovels, agricultural hawks, etc., although they are not shown in the drawings.

As described above, the present invention has a handle main body of a predetermined length formed from a metal tube with a circular cross-sectional outline, and the handle main body has the following features:
At the very least, since we have formed an ampulla at the stress concentration point that is continuous with the grade connection position, even if a metal tube with a smaller diameter than usual is selected, the area around the grade connection part will be affected by the bending moment caused by the grip. It is possible to increase the strength of the structure while making it lightweight overall.
Even when the workpiece is heavy, such as earth and sand, the work of digging and lifting can be repeatedly and reliably and easily performed using the grade.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a partially sectional front view thereof, FIGS. 3 and 4 are partially sectional front views showing other embodiments of the present invention, and FIG. 6 is an explanatory diagram showing the state of the device shown in FIG. 4 before assembly. (1)... Handle body (lt)... Ampulla (2)... Grip body (3)... ·grade

Claims (1)

[Claims] A handle for a manual tool, such as a shovel or shovel, comprising a handle body of a predetermined length, wherein the waste body is formed of a metal tube having a circular cross-sectional outline, and the handle body includes at least:
A handle for a hand tool characterized by forming an ampulla at a stress concentration position continuous with a grade connection position.