JPS59124584A - Handle for manual tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

In general, this type of handle is designed for ease of gripping the handle body during work, torque resistance when an uneven load is applied in the lateral direction to the grade attached to the end of the handle body, and Taking into consideration the strength against the load of earth and sand to be lifted, for example, when the cross-sectional shape is circular, the outer diameter should be selected to be 84 degrees, for example.

By the way, in order to obtain a particularly high strength against the above-mentioned load, when the material used for the handle body is a metal tube, the outer diameter is set to the above-mentioned optimum diameter, and the bracket tube thickness is set to a value close to the minimum value necessary for the above-mentioned strength. However, it was not possible to reduce the weight at all, and there was a problem that fatigue increased even under light loads during work.

An object of the present invention is to use a metal tube as the handle body and make the grip portion enlarged so that even if a metal tube with a smaller diameter than the normally used metal tube is selected, the size of the grip portion can be adjusted to make it easy to grip. In addition, the product for shovels, shovels, and agricultural use can be formed into an optimal diameter that has a high torque resistance against uneven loads applied to the grade, and has great strength against the loads applied to the grade, while being sufficiently lightweight. The point is that it provides a handle for a hawk.

The structure of the present invention includes a shovel consisting of a handle body having a predetermined length;
A handle for a manual tool such as a shovel, in which the handle body is formed of a metal tube with a circular cross-sectional outline, and the handle body is provided at a gripping position at least in the middle in the length direction of the handle body over the entire length of the gripping position. The following seven embodiments of the present invention will be described 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 enlarged portion (11) is formed at least at the gripping position in the middle of the handle body (1) in the longitudinal direction, extending over the entire length of the gripping position.

In the case shown in FIGS. 1 and 2, the enlarged portion (11) has a circular cross-sectional outer shape and is formed to have an equal diameter over the entire length.

Therefore, the thickness of the handle body (1) before the bulk processing is t, the average diameter of the inner diameter is d, and the average diameter of the outer diameter is d.
) thickness is t2 (<tl), the average diameter of the inner and outer diameter is d,
(> d, ), and assuming that the cross-sectional area of the handle body (1) does not change before and after extensive processing, πd
,t, = 71:d,t, ,Therefore,d,t,
= d, t holds true.

By the way, the metal tube used for the handle body (1) has an outer diameter smaller than the normally used outer diameter, for example, 34 mm, for example, 3 mm.
2. The thickness of the handle is 1.2H, and the value of the thickness with respect to the average diameter is extremely smaller than 1 both before and after the bulk processing. Therefore, from the above relational expression, the handle body ( When the average diameter of 1) is increased by a certain percentage, for example 10%, the thickness is y
It will decrease by the same percentage, for example 10%.

In addition, the section modulus of a tubular body exhibiting a circular cross section is 1, and when the thickness tρ with respect to the average diameter Da of the inner and outer diameters d is extremely smaller than 1, the section modulus becomes approximately 8 Da''t.

Therefore, the section modulus of the handle body (1) before and after the extensive machining is approximately 0°8, since the value of the thickness relative to the average diameter of the metal tube used is extremely smaller than 1.
d, 't, , o, ga, 't, Therefore, the bending stress due to the bending moment M at the gripping position of the handle body (1) that has not been subjected to extensive processing and for those that have been subjected to extensive processing is , each of them is different from each other, so the handle body (1
), with the cross-sectional area constant (d, t, = d
, t, ), the average diameter is expressed as a constant ratio of 1u, for example, 1
When the bending stress is increased, the bending stress applied to the grip position is
Approximately, the proportion is the same as the above-mentioned fixed proportion, for example, 10% is reduced.Thus, specifically, the metal tube used for the handle body (1) is smaller than the predetermined tube group normally used, for example, a 34-cut one. The enlarged portion (2) is formed by using a small diameter, for example, 32 scale and 1°2H thickness, and enlarging the grip position to a diameter of, for example, 85.2 m. By doing this, compared to the normally used outer diameter of 84,
While the weight 2 of the handle body (1) can be reduced by n, that is, about 6%, the bending stress in the grip can be maintained at the same value as y.

In the handle body (1), not only the grip position and mouth position, but also the connection part with the grade (3),
Since an extra large bending moment is applied during the work, the entire length of the grip position to the connection part with the grade (3) is
The enlarged portion (II) is formed to have the same diameter throughout.

That is, the grade (3) is placed within the end of the handle body (1).
By fitting and connecting the mounting tube (31) in a double manner and also inserting the reinforcing rod (4) into the mounting tube (3I), the connecting portion of the handle body (1) with the mounting tube (31) is secured. Reinforce and
The enlarged portion (11) is provided in the handle body (1) from the proximal side press-contact end of the mounting tube (31) slightly to the grip position from the grade (3) side edge, and the handle body (1) The continuous stress concentration is added to the connection part with Grade (3) for 1 minute and reinforced.

In the above configuration, the metal tube used in the handle body ( ) is of a smaller diameter than the one normally used, and the enlarged portion (1'1) is formed at the grip position, ensuring ease of grip. At the same time, it also ensures sufficient torque resistance when a lateral unbalanced load is applied to grade (3) during work.Also, even if the pipe thickness becomes smaller due to extensive machining, the outer diameter can be reduced slightly compared to conventional products. By increasing the size, it is possible to ensure strength against the bending moment during work, and since the pipe is made with a small thickness, it can be made lighter, which reduces fatigue during work.
It also becomes easier to carry and handle. In addition, the area around the connection with grade (3) can also be reinforced, so
The connection structure with grade (3) can also be simplified.

The connection structure between the handle body (1) and the grade (3) can be made into various structures, such as a butt-like structure or a striped structure, as shown in Fig. 3, in addition to the above-mentioned embodiments. Needless to say.

In addition, in the above explanation, the area around the connection with grade (3) in the handle body (I) was also intended to be reinforced to a large extent, but as shown in Figure 41, the stress concentration position due to the connection with grade (3) was reinforced. In the case where the reinforcing means (5) such as resin filling is not used, the enlarged portion (11) may be provided only in the portion extending over the entire length of the grip position.

In addition, in the above explanation, the cross-sectional outer diameter of the ampullae (11) is
Although it is circular, it may also be non-circular such as oval or oval.
In the case of an oval shape, it should be vertical in the lifting direction, with a large inner part at the bottom and a small inner part in the upper part; Specifically, the metal tube used has an outer diameter of 32M and a tube thickness of 1.2m, as in the case of the previous embodiment, and the short diameter part is It is preferable that the length of the cod be 34 cod and the long diameter part be 87 cod. Accurately calculate the rate of decrease in bending stress for the case of this example and the case of a circular cross section with an outer diameter of 85.2 m as in the previous example, without using approximations. Then, each 2.1%,
It becomes 1.2%. That is, by making the cross-sectional shape of the enlarged portion (11) elongated in the lifting direction and elliptical as in this example, the section modulus becomes significantly larger than that of a circular cross-sectional shape, and bending stress is reduced. and is long in the lifting direction, making it easier to grip and improving grade (
3) It is possible to increase the torque resistance when an unbalanced load is applied in the lateral direction, and since a pipe with a small thickness is used, the weight can be reduced accordingly, which reduces fatigue during work and improves durability. It also becomes easier to transport and handle.

In addition, in the case where the enlarged portion (II) is formed to have an elliptical cross-section such that the major diameter part in the lifting direction is 37 degrees and the short diameter part in the lateral direction is 34 degrees, the enlarged part (II) is
l'l), a plurality of longitudinal grooves (6) are provided in the circumferential direction, which are recessed in an arc shape and into which the fingertips can be inserted, for example, as shown in FIGS. The 4 and 6 trees shown in Figure 6 may be arranged side by side.

By doing so, when an unbalanced load is applied to the grade (8) in the lateral direction, a large torque resistance function is generated due to the fingertip invaginated in the groove (6).
Coupled with the frictional resistance caused by contact with the palm and fingertips of the gripping hand, and the torque resistance caused by gripping something with an oval cross section, the overall torque resistance becomes extremely large, and the load resistance for grade (3) is extremely high. Regardless of the condition of the grip, even if the grip part is covered with water or mud, it can be held securely without slipping, and therefore, it will not slip even without inputting a large grip force, reducing the fatigue level. You can work with less effort.

In addition, the outer diameter of the metal tube used in the handle body (1).

The thickness, cross-sectional shape and size of the enlarged portion (11) can be arbitrarily selected in relation to ease of grip, strength against bending moment due to the above-mentioned torque resistance a9 operation, and weight.

Further, although the above explanation is applied to a shovel, it goes without saying that it can be similarly applied to various hand tools such as shovels and agricultural hawks. , is formed of a metal tube with a circular cross-sectional outline, and an enlarged portion is formed at least at the grip position in the middle in the length direction of the handle body over the entire length of the grip position. Not only is the overall weight reduced by using a diameter smaller than that conventionally used, but by forming the enlarged portion, it is easy to grip and has sufficient torque resistance against uneven loads applied to the grade. Moreover, it can have great strength against bending moments during work.

[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, and Figs. 5 and 6. FIG. 3 is a cross-sectional view of the ampullae showing another embodiment. (1)... Handle body (11)... Ampulla (2)... Grip body agent Patent attorney Tsu 1) Hisashi Nao

Claims (2)

[Claims] (1) A net for manual tools such as shovels and shovels consisting of a handle body of a predetermined length, wherein the handle body is formed from a metal tube with a circular cross-sectional outline, and the handle body has at least a length of 1. A net for a manual tool, characterized in that an enlarged portion is formed at a gripping position intermediate in the widthwise direction and extending over the entire length of the gripping position. (2) The hand tool according to claim 1, wherein the enlarged portion of the handle body is formed in a non-circular cross-sectional shape with a longer length in the lifting direction than in the lateral direction. Net for use.