JPH0336591Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a handle for a hand tool, specifically a grip body having a grip portion between the tips of a pair of semi-cylindrical forked portions; The present invention relates to a handle for a manual tool such as a shovel or a shovel, which comprises a handle body of a predetermined length attached to the base of the forked part.

(Prior art) Conventionally, handles for hand tools of this type were manufactured in the 1980s.
As shown in Publication No. 36444, a fitting portion is formed by cutting out the opposing inner wall of the root portion of the forked portion, and a cylindrical body is fitted to the outer circumferential surface of the fitting portion of the root portion, and , the base end of the handle body is closely fitted to the inner circumferential surface of the fitting portion, and the base portion, the cylindrical body, and the handle body are integrally connected in three layers;
It is well known that the grip body and the handle body are configured to be quickly and easily connected by fitting and connecting without welding or using pins.

(Problems to be Solved by the Invention) However, in the case of the above-mentioned structure, since the connection is only by fitting, the root part, the cylindrical part, and the handle body may overlap when used for a long period of time. There was a risk that the connections in some parts would become loose.

Therefore, in the present invention, after the root part, the cylindrical part, and the handle body are fitted into three layers and superposed into three layers, the entire length or a part of the overlapped part is plastically deformed inward to form a square cylindrical part. The purpose of this invention is to provide a handle for a hand tool that can be used for a long period of time by forming a stronger bond between the polymerized portions.

(Means for Solving the Problems) The present invention includes a grip body in which a grip portion is provided between the tips of a pair of forked portions exhibiting a semi-cylindrical shape, and a grip body that is attached to the root portion of the fork portions. A handle for a manual tool such as a shovel or a shovel, which is composed of a handle main body of a predetermined length, and a fitting part is formed by cutting out the opposing inner wall of the root part of the forked part, and the fitting part of the root part is cut out. A cylindrical body is fitted to either the outer circumferential surface or the inner circumferential surface at the joint part, and the base end of the handle body is fitted to the other, thereby forming a three-layer structure consisting of the base part, the cylindrical body, and the handle body. While forming an overlapping part, the base end side of the cylindrical body or handle body that fits into the outer circumferential surface of the fitting part of the root part, and the opposing inner wall remains beyond the fitting part. A rectangular cylindrical portion is formed by fitting into the outer periphery and plastically deforming inward over the entire length or part of the overlapping portion including the outer periphery of the root portion.

(Function) Therefore, when joining the grip body and the handle body, the root part of the forked part, the cylindrical body, and the handle body are overlaid into three layers by fitting, and the length at the overlapping part is The entire length or part of the handle is plastically deformed inward to form a rectangular cylindrical portion extending between the cylindrical body or the handle body and the base portion, so that the joint can be quickly and easily performed by a simple joining operation. In addition, the proximal end side of the cylindrical body or handle body that fits on the outer peripheral surface of the fitting portion of the root portion is fitted to the outer periphery of the root portion where the opposing inner wall remains beyond the fitting portion. Since the overlapping portion including the outer periphery of the root portion is plastically deformed inward to form a rectangular cylindrical portion,
By forming this rectangular cylindrical portion, gaps between the abutting portions of the opposing inner walls that occur when forming an overlapping portion by fitting the root portion with the cylindrical body and the handle body are reliably eliminated, and the cylindrical body and the base This allows the parts to be strongly integrated.

(Example) The thing shown in Fig. 4 is a shovel.
are a pair of semi-cylindrical forked parts 21, 21;
A shovel handle consisting of a grip body 2 having a grip part 20 between the distal ends thereof, and a pipe-shaped handle main body 3 of a predetermined length attached to the base parts 22, 22 of the forked parts 21, 21, A blade 4 is fixed to the tip 31 of the handle body 3.

Therefore, as shown in FIG.
The opposing inner wall 2 of the root portions 22, 22 in 1, 21
2a, 22a are cut out to form a fitting part 23 having approximately the same diameter as the outer diameter of the handle body 3, and the tips of the root parts 22, 22 are bent inward to form the outer diameter of the handle body 3. A semicircular pressing piece 24, 24 having a diameter smaller than the diameter is formed, and the root portion 22, 2
A cylindrical body 5 is closely fitted to the outer periphery of the handle body 3 to absorb the elastic deformation of the pressing pieces 24, 24, and the base end of the handle body 3 has a diameter smaller than the tips of the pressing pieces 24, 24. A tapered insertion part 32 is formed, and the pressing pieces 24, 24 are elastically deformed by fitting into the fitting part 23 of the handle body 3, and the base parts 22, 22 and the cylindrical body are elastically deformed. 5 and the handle body 3 are fixed by interference fit to form a three-layer overlapping part 6, while the cylindrical body 5 that fits into the outer circumferential surface of the fitting part 23 of the root part 22 is fixed by interference fit. The opposing inner wall 22a is fitted onto the remaining outer periphery of the root portion beyond the joint portion 23, and the grip portion side end is attached to the cylindrical body 5 located at the outermost layer of the overlapping portion 6 including the outer periphery of the root portion. The circumferential surface of the handle is plastically deformed inward to form a rectangular cylindrical portion 7 extending over the root portions 22, 22, and the handle body 3, the root portions 22, 22, and the cylindrical body 5 are integrally connected. It is.

As a means for forming the rectangular cylindrical portion 7, a press machine (not shown) is used from the outside of the outer circumferential surface of the cylindrical body 5, and the press machine simultaneously presses, for example, 12 locations on the outer circumferential surface of the root portions 22, 22. By plastically deforming it to the side, a rectangular cylindrical portion 7 having a substantially dodecagonal cross section as shown in FIG. 3 is formed across the cylindrical body 5 and the root portions 22, 22.

Further, the end portion of the cylindrical portion 5 on the grip portion side is long enough to reach a position above the opposing inner walls 22a, 22a during superposition, and when forming the rectangular cylindrical portion 7, the root portion 22 .
The cylindrical portion 5 and the root portions 23, 23 are firmly integrated by eliminating gaps between the abutting portions a, 22a and b.

As a result, when using the shovel, the cylindrical body 5
and the abutting portions a, b between the root portions 22, 22.
As a result, the insertion portion 32 in the handle body 3 can be prevented from shifting in the radial direction due to the gap between the two.
Using this as a fulcrum, the load on the blade 4 side acts intensively on the portion of the root portions 22, 22 where the misalignment has occurred, corresponding to the insertion portion 32, thereby reliably preventing cracks from occurring in that portion. It can be done.

In addition, in the embodiment, as shown in FIGS. 1 and 6, the side surface of the overlapping portion 6 is plastically deformed inward to form the three-layer recesses 8, 8, and the handle body 3 and The root portions 22, 22 and the cylindrical body 5 are integrally connected to increase the strength of the connection between the three. As the means for forming the recesses 8, 8, it is preferable to use a press machine and form them before forming the rectangular cylindrical portion 7.

The cylindrical body 5 has one end attached to the handle body 3.
The tip portion 51 is bent so as to have approximately the same diameter as the outer diameter of the tip portion 51.
, and the tip portion 51 connects the root portion 22,
The ends of the 22 pressing pieces 24, 24 can be hidden.

Moreover, cylindrical receiving parts 25, 25 facing each other are formed at the distal ends of the forked parts 21, 21, and a wooden grip part 20 is fitted into each of these receiving parts 25, 25. 20 and the receiving parts 25, 25 with a nail 2
It is fixed by 6.

Moreover, the fitting portion 23 in the root portions 22, 22
The cylindrical body 5 is fitted on the outer circumferential surface of the fitting part 23, and the handle body is fitted on the inner circumferential surface of the fitting part 23 to form a three-layer overlapping part 6. The handle body 3 may be fitted to the handle body 3 to form a three-layer overlapping portion 6.

In this case, the outer diameter of the cylindrical body 5 is set to the fitting part 2.
3, and the inner diameter of the handle body 3 is formed to be substantially the same as the outer diameter of the fitting portion 23, and the insertion portion 32 is not provided.

Furthermore, the square tubular portion 7 refers not only to a square tube shape in which flat plastically deformed surfaces are connected, but also to one in which the plastically deformed surfaces are formed intermittently through rounded portions at regular intervals. It includes.

In the above-mentioned embodiments, the square cylindrical portion 7 is formed at the end of the cylindrical body 5 on the grip side, but the position where the square cylindrical portion 7 is formed is not limited in any way.
For example, it may be formed at the axial end portion or intermediate portion of the cylindrical body 5. In this case, it is preferable that the rectangular cylindrical portion 7 be formed in three layers: the cylindrical body 5, the root portions 22, 22, and the handle body 3.

(Effects of the invention) As described above, according to the invention, when joining the grip body and the handle body, the root part of the forked part, the cylindrical body and the handle body are fitted into each other to form three layers,
The simple operation of forming a rectangular cylindrical part by inward plastic deformation at the overlapping part allows for faster and easier joining than when joining by welding or using pins. At the same time, the angular cylindrical part can make the bonding at the overlapping part stronger, and when forming the angular cylindrical part, it is especially possible to fit the outer circumferential surface of the fitting part of the root part. The proximal end side of the mating cylindrical body or handle body is fitted to the outer periphery of the root portion where the opposing inner wall remains beyond the fitting portion, and the length of the overlapping portion including the outer periphery of the root portion is determined. Since the rectangular cylindrical part is formed by plastic deformation inward over the entire length or part of the direction, the formation of this rectangular cylindrical part will cause the formation of an overlapping part due to the fitting of the root part with the cylindrical body and the handle body. The cylindrical body and the root portion can be firmly integrated by eliminating the gaps between the abutting portions of the opposing inner walls. This can prevent the occurrence of deviation in the radial direction due to the gap between the abutting parts, and as a result, using the insertion end of the handle body as a fulcrum, the blade side can be inserted into the part of the base where the deviation has occurred, corresponding to the insertion end. This prevents the occurrence of cracks in those parts due to the concentrated application of loads, making it possible to use them for long periods of time.

Furthermore, when plastically deforming the overlapping part inward, it is plastically deformed into a rectangular tube shape rather than being reduced in diameter into a cylindrical shape, so when processing by plastically deforming it with one press, it is possible to Plastic deformation into a cylindrical shape allows for better adhesion of the polymerized parts compared to the case where the diameter is reduced into a cylindrical shape, and this makes it possible to firmly bond the polymerized parts in a single processing operation. be.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway plan view of the main part showing an embodiment of the present invention, Fig. 2 is an enlarged plan view of the main part, Fig. 3 is an end view taken along the line shown in Fig. 2, and Fig. 4 is a manual tool. A side view when the handle is applied to a shovel, Figure 5 is a side view of one of the forked parts, Figure 6 is a sectional view taken along the line shown in Figure 4, and Figure 7 is a diagram showing how the handle body fits into the grip body. It is an explanatory diagram of joint work. 2... Grip body, 20... Grip portion, 21... Forked portion, 22... Root portion, 22a, 22a... Opposing inner wall, 23... Fitting portion, 3... Handle body, 4... ...Blade, 6...Overlapping part, 7... Square cylindrical part.

Claims (1)

[Scope of utility model registration request] A shovel, a shovel, etc., consisting of a grip body with a grip between the tips of a pair of semi-cylindrical forked parts, and a handle body of a predetermined length attached to the base of the forked parts. A handle for a hand tool, in which a fitting portion is formed by cutting out the opposing inner wall of the root portion of the forked portion, and either an outer circumferential surface or an inner circumferential surface of the fitting portion of the root portion. A cylindrical body is fitted to one side, and a base end of the handle body is fitted to the other side to form a three-layer overlapping part of the root part, the cylindrical body, and the handle body; The proximal end side of the cylindrical body or handle body that fits into the outer peripheral surface of A handle for a hand tool, characterized in that a square tubular part is formed by plastic deformation inward over the entire length or a part of the overlapping part in the longitudinal direction.