Handle of hand work tool for agriculture, horticulture, or civil engineering work

Abstract

To provide a handle of a hand work tool provided with a reinforcement rib capable of performing swaging processing.SOLUTION: A handle 10 of a hand work tool for agriculture, horticulture, or civil engineering work includes: a metal cylindrical handle body 20; and two or more curved ribs 30 (31, 32) provided in a lengthwise direction of the inside of the handle body 20. The curved ribs 30 (31, 32) are formed of a tabular body having an arc-shaped cross section, and are formed integrally with the handle body 20 with a predetermined interval such that, while a curved projection part faces a curved projection part of the other curved rib, the curved projection part does not contact the curved projection part of the other curved rib in the inside of the handle body 20.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the handles of hand tools, such as shovels, spades, rakes, etc., used primarily in agricultural work (including gardening) and civil engineering work. [Background technology]

[0002] Conventionally, hand tools used for agricultural, horticultural or civil engineering work, such as sawmills, In the past, hand tools such as shovels, shovels, spades, hawks, pickaxes, hammers, hoes, spades, hoes, rakes, rakes, brooms, and grass scrapers typically had wooden handles attached to metal working parts. However, in recent years, as shown in Utility Model Registration No. 3112816, for example, metal handles have also come to be widely used for their rigidity and durability. In these cases, in order to make the handles lightweight for ease of use, handles molded into a pipe shape from a light metal such as aluminum are often used.

[0003] When connecting the handle and working part of the hand tool, a connecting structure is adopted in which the working part is provided with a tubular receptacle for inserting the handle, and the tip of the handle is inserted into the receptacle and fixed. In this case, the receptacle is formed in a tubular shape with a roughly C-shaped cross section that is notched in the longitudinal direction and is formed so that its diameter decreases toward the working part. When the handle, which has a tapered tip, is press-fitted into the receptacle, it is inserted into the receptacle while expanding in diameter to conform to the shape of the tip of the handle. This reduces rattle, increases the contact area between the working part and the handle, and increases the strength of the connecting part.

[0004] When a metal handle is used as the handle of the hand tool, when the handle is connected to a working part such as a scooping part, the tip of the connecting side of the handle may be subjected to a swaging treatment, and the handle may be inserted into the insertion part formed in the working part and slit in the longitudinal direction, and then fixed by means of welding, bolting, etc.

[0005] On the other hand, even handles made of metal pipes as described above may bend or break during use. Therefore, as a means of increasing rigidity, there is a rigid pipe described in, for example, Japanese Utility Model Laid-Open Publication No. 3-25091 (Patent Publication 1), although it is in a different technical field. The pipe described in the publication has an overall cylindrical shape and is provided with reinforcing ribs extending inward. The reinforcing ribs are provided at multiple locations on the inner surface of the pipe, and the reinforcing ribs and the pipe are molded integrally. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 3-25091, page 1 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the shape of the reinforcing ribs described in the publication, the reinforcing ribs provided inside the handle are connected to each other, and the presence of the reinforcing ribs makes it impossible to reduce the diameter of the tip of the handle. Therefore, the swaging process cannot be performed with the reinforcing ribs of the shape described above.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a handle for the above hand tool provided with reinforcing ribs that can be subjected to a swaging treatment. [Means for solving the problem]

[0009] The handle of a hand tool for agricultural, horticultural or civil engineering work described in claim 1 comprises a cylindrical metal handle body and two or more curved ribs arranged along the length of the inner peripheral surface of the handle body, the curved ribs being formed from plate-like bodies with an arc-shaped cross section, and being molded integrally with the handle body with a predetermined radial spacing so that the curved bulges on the inner peripheral surface of the handle body face the curved bulges of other curved ribs, but do not interfere with the curved bulges of other curved ribs.

[0010] In the handle of a hand tool for agricultural, horticultural or civil engineering work described in claim 1, the curved ribs increase the strength of the handle body, and the curved ribs are formed of plate-like bodies with an arcuate cross section. Inside the handle body, the curved bulges face the curved bulges of other curved ribs, but are formed with a predetermined radial distance so as not to interfere with the curved bulges of other curved ribs. Therefore, when the end is swaged into a tapered shape, the curved ribs are deformed by reducing their diameter so that their curvature becomes smaller toward the center of the interior of the handle body 20, so that the swaging process can be performed.

[0011] The handle of a hand tool for agricultural, horticultural or civil engineering work described in claim 2 is characterized in that, in the handle of a hand tool for agricultural, horticultural or civil engineering work described in claim 1, two to four of the curved ribs are molded over the entire length or a portion of the handle body.

[0012] In the handle of the hand tool for agricultural, gardening or civil engineering work described in claim 2, the number of curved ribs is set to 2 to 4, so that the strength can be increased without significantly increasing the weight of the curved ribs.

[0013] The handle of a hand tool for agricultural, horticultural or civil engineering work described in claim 3 is characterized in that, in the handle of a hand tool for agricultural, horticultural or civil engineering work described in claim 1 or 2, one end or both ends of the handle body have been subjected to a swaging treatment.

[0014] In the handle of the hand tool for agricultural, gardening or civil engineering work described in claim 3, the handle side of the working part can also be subjected to swaging treatment.

[0015] The hand tools for agricultural, horticultural or civil engineering work described in claims 4 and 5 are provided with the handles described above, and therefore are provided with the handles of the hand tools for agricultural, horticultural or civil engineering work described in any one of claims 1 to 3, which increases the strength of the handle body and enables the handle to be swaged. [Effects of the Invention]

[0016] According to the handle for a hand tool for agricultural, horticultural or civil engineering work described in claim 1, the curved ribs increase the strength of the handle body, and the curved ribs are formed of plate-like bodies with an arcuate cross section. Inside the handle body, the curved bulges face the curved bulges of other curved ribs, but are formed with a predetermined radial distance between them so as not to interfere with the curved bulges of other curved ribs. Therefore, when the end is swaged into a tapered shape, the curved ribs are deformed by reducing their diameter toward the center of the handle body so that their curvature becomes smaller, and therefore the swaging process can be performed.

[0017] According to the handle for a hand tool for agricultural, horticultural or civil engineering work described in claim 2, in the handle for a hand tool for agricultural, horticultural or civil engineering work described in claim 1, two to four of the curved ribs can be molded over the entire length or a portion of the handle body, thereby making it possible to suitably increase the strength without significantly increasing the weight of the curved ribs.

[0018] According to the handle for a hand tool for agricultural, horticultural or civil engineering work described in claim 3, in the handle for a hand tool for agricultural, horticultural or civil engineering work described in claim 1 or 2, swaging can be applied to one end or both ends of the handle body, so that swaging can also be applied to the handle side of the working part.

[0019] According to the hand tools for agricultural, horticultural or civil engineering work described in claims 4 and 5, the handle is provided, and therefore the handle of the hand tool for agricultural, horticultural or civil engineering work described in any one of claims 1 to 3 is provided, so that the strength of the handle body can be increased and the handle can be subjected to a swaging treatment. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a perspective view of a handle of a hand tool according to an embodiment of the present invention. [Figure 2] FIG. 1 is a process diagram for performing a swaging treatment on the handle of a hand tool. [Figure 3] 2. (a) is an end view taken along line AA in FIG. 2, (b) is an end view taken along line BB in FIG. 2, and (c) is an end view taken along line CC in FIG. [Figure 4] FIG. 2(c) is a plan view of FIG. [Figure 5] 1A, 1B, and 1C are diagrams showing the working part of a shovel, where (a) is a plan view, (b) is a side view, and (c) is a bottom view. [Figure 6] (a) is a plan view and (b) is a side view of the shovel with the handle attached to the working part. [Figure 7] 10A and 10B are end views of handles of hand tools showing other embodiments, where (a) is an end view of the handle of a hand tool having three reinforcing ribs, and (b) is an end view of the handle of a hand tool having four reinforcing ribs. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the best mode for carrying out the present invention will be specifically described with reference to the drawings.

[0022] FIG. 1 is an oblique view of a handle of a hand tool according to one embodiment of the present invention, FIG. 2 is a process diagram illustrating the swaging treatment performed on the tip of the handle of the hand tool, FIG. 3(a) is an end view taken along line AA in FIG. 2, (b) is an end view taken along line BB in FIG. 2, (c) is an end view taken along line CC in FIG. 2, and FIG. 4 is a plan view of FIG. 2(c).

[0023] In Figures 1 to 4, 10 is a handle of a hand tool for agricultural, horticultural or civil engineering work (hereinafter referred to as "hand tool") according to the present invention, and the handle 10 of the hand tool has curved ribs 30 (31, 32) that bulge and curve toward the center in the radial direction of the handle body 20, integrally molded inside the long, cylindrical metal handle body 20, as shown in Figures 1 and 2(a).

[0024] The curved ribs 30 (31, 32) are formed on a pair of plate-like bodies with an arc-shaped cross section, and are positioned inside the handle so that the bulging portions of the plate-like bodies face each other, and the bulging portions of the plate-like bodies 31 and 32 are formed with a predetermined distance between them.

[0025] 2 is a diagram showing the process of swaging the tip of the handle 10 of the hand tool and cutting out a portion of the tip to facilitate and strengthen attachment to the working part. The handle 10 of the hand tool according to the present invention has the above-described configuration, and therefore the reinforcing ribs 30 (31, 32) can increase its strength, and the end can be subjected to swaging (drawing).

[0026] Fig. 2(a) is a side view of the handle 10, and (b) is a side view of the handle 10 after swaging at the tip X (the part inserted into the working part). Figs. 3(a) to 3(c) are end views taken along lines AA, BB, and CC in Figs. 2(a) and 2(b).

[0027] The handle body 20 of the handle 10 is formed by extruding an aluminum alloy pipe having an outer diameter of 34 mm and a thickness of 2 mm, and the curved ribs 30 (31, 32) inside the handle 20 are also formed integrally with the handle body 20. The curved ribs 30 (31, 32) are molded to a thickness of 2 mm and a radius of 17 mm. As shown in Figure 2(b), when the curved ribs 30 (31, 32) are molded into a tapered shape toward the tip, the bulging portions of the internal curved ribs 30 (31, 32) are formed at a predetermined interval, and therefore, they deform so that the curvature becomes smaller toward the center of the interior, and at the tip, the bulging portions come into contact with each other, and when further pressure is applied, they are depressed and fixed in place while in contact, thereby increasing the strength.

[0028] As shown in Figures 2(c) and 4, the tip of the handle 10 has a notch 11 on the top surface so that it can be inserted deeply into an insertion portion 72 of a working part 70 (see Figure 6) described later.

[0029] Fig. 5 shows the working unit 70 of the shovel, (a) being a plan view, (b) being a side view, and (c) being a bottom view. Fig. 6 shows the working unit of the shovel with a handle attached, (a) being a plan view, and (b) being a side view.

[0030] The working part 70 of the shovel shown in Figure 5 comprises a scooping part 71 and an inserted part 72 of the handle 10 provided at the rear end of the scooping part 70. The inserted part 72 has a curved part 74 that curves upward relative to the scooping part 71, and also has a gap 73 in the center of the length of the underside, so that the working part 70 is formed as a roughly C-shaped cylindrical body overall, and is formed so that the diameter slightly increases towards the rear end.

[0031] 6A and 6B are a plan view and a side view, respectively, of a state in which a handle is attached to a working part 70 of a shovel.

[0032] As shown in Figure 6, the swaged tip of the handle 10 is inserted into the cylindrical receptacle 72 of the working part 70 of the shovel and fixed with a pin P. When the handle 10, which has a tapered tip, is press-fit into the receptacle 72 during insertion, the receptacle 72 expands slightly in diameter to conform to the shape of the tip of the handle 10 as it is inserted. As a result, the tip of the handle 10 is inserted along the inner circumferential surface of the receptacle 72, increasing the contact area between the receptacle 72 and the handle 10, reducing wobble and increasing the strength of the connection. In addition, a notch 11 is provided on the top surface of the most distal end of the handle 10, so that the tip of the handle 10 can be inserted further and fixed without coming into contact with the curve 74 of the receptacle 72.

[0033] Figure 7 is an end view of the handles 10A and 10B showing other embodiments, and the handle 10A shown in Figure 7(a) has three curved ribs 40 (41, 41, 42) provided at equal intervals inside the handle, while the handle 10B shown in Figure 7(b) has four curved ribs 50 (51, 52, 53, 54) provided at equal intervals inside the handle. In this way, a plurality of curved ribs may be provided inside the handle, but considering the weight of the entire handle, the number of curved ribs is preferably about 2 to 4.

[0034] The handles 10, 10A, 10B having the above-described configuration are attached to metal working parts of hand tools used for agricultural, gardening or civil engineering work, such as shovels, shovels, spades, hawks, pickaxes, hammers, hoes, hoes, sweepers, rakes, pitchforks, brooms and grass scrapers. When attaching the handles, the tip of the handle 10 is subjected to a swaging process (drawing process) to make the attachment easy and strong.

[0035] If not necessary, the swaging process does not have to be performed on the handle 10. Also, for example, if necessary for attaching a handle or for other reasons, the swaging process may be performed on the rear end or both ends of the handle 10.

[0036] The thickness, length, and other dimensions of the handles 10, 10A, and 10B can be set as appropriate depending on the intended use. The thickness, curvature, and other dimensions of the curved ribs 30, 40, and 50 can also be designed as appropriate, as can the number of the curved ribs. The curved ribs with an arc-shaped cross section may have some irregularities as long as they are generally arc-shaped overall.

[0037] Additionally, the configurations of the handles 10, 10A, 10B and the curved portions 30, 40, 50 can be freely modified within the intended scope of the present invention. [Explanation of symbols]

[0038] 10 Handle of work tool 10A Handle of Work Tool (Other Embodiments) 10B Handle of work tool (other embodiments) 11 Cutout 20 Handle body (pipe) 30 (31, 32) curved rib 40 (41, 42, 43) Curved rib (other embodiments) 50 (51, 52, 53, 54) Curved rib (other embodiments) 60 Handle 70 Working unit (shovel) 71 Scooping section 72 Inserted part 73 Gap 74 Curved section X Swaging processing section P-pin

Claims

1. The handle has a cylindrical metal body and two or more curved ribs provided in the length direction inside the handle body. A handle for a hand tool for agricultural, gardening or civil engineering work, characterized in that the curved rib is formed of a plate-like body with an arcuate cross section, and is molded integrally with the handle body at a predetermined interval so that, inside the handle body, the curved bulge portion faces the curved bulge portion of another curved rib, but does not interfere with the curved bulge portion of another curved rib.

2. 2. A handle for a hand tool for agricultural, horticultural or civil engineering work as claimed in claim 1, wherein two to four of said curved ribs are formed over the entire length or a part of said handle body.

3. 3. A handle for a hand tool for agricultural, horticultural or civil engineering work according to claim 1 or 2, wherein one or both ends of said handle body are subjected to a swaging treatment.

4. A hand tool for agricultural, horticultural or civil engineering work, comprising the handle of the hand tool according to claim 1 or 2.

5. A hand tool for agricultural, horticultural or civil engineering work, comprising the handle of the hand tool according to claim 3.

Images