JPH0214941Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of application of the invention" The invention relates to handles for tools such as files, chisels, and saws.

"Prior art and its problems" The handles of tools that have been commercially available and used in the past are made of materials such as wood, metal, rubber, and synthetic resin. Make a deep insertion hole and insert the base of the tool, wrap a fastener etc. around the front end of the handle (such as a kitchen knife), and prevent separation with a mekugi (such as a saw), or , the two handles are joined together, the base of the tool is sandwiched between them, and they are firmly tightened with screws, screws, nuts, etc.

The reason for this is that it is difficult to accurately drill a deep vertical hole in the axial direction in the handle, and there is a limit to the ability to drill a deep vertical hole in a rod-shaped handle using a drill or the like.

``Purpose of the present invention'' The present invention compensates for the above-mentioned drawbacks and automatically creates a vertical hole by drilling from the side wall of the handle without having to drill a vertical hole in the handle in a separate process. To obtain an inexpensive handle suitable for mass production that firmly fixes the base of a tool without using a fastener or the like.

"Embodiments of the Present Invention" The details will be described below with reference to embodiments shown in the drawings.

Materials for the handle include thermoplastic or thermosetting synthetic resins, rubbery substances, wood or other fine powders mixed with coagulants, and inorganic materials such as sodium bicarbonate or organic materials such as azodicarbonamide. Molding is performed using a foam mixed with a foaming agent.

As can be seen from the embodiment shown in FIGS. 1 to 5, a bottomed side hole 2 is bored in one side wall 1 at the substantially center of one end surface in the longitudinal direction of a substantially rectangular handle, leaving a bottom portion 41.
1, and a bottomed side hole 2 which is similarly bored with a bottom portion 42 spaced apart from the bottomed side hole 21 in the longitudinal direction.
2, and the bottomed side holes 21, 22 are bored so as to leave a part of the bottoms 41, 42 and leave the bottoms 43, 44 approximately in the longitudinal center of the sidewall 2 opposite to the sidewall 1; Other bottomed side holes 31, 34 are provided which communicate with the shaft hole 71, and the plurality of bottomed side holes that communicate with each other alternately correspond to each other, and a shaft hole 71 is formed approximately inside the center in the longitudinal direction.
form.

This shaft hole 71 portion is the C-C plane (hereinafter referred to as parting line) of the mother die (mostly the mold) (C-1-C plane depending on the mold design or molding conditions). (It may be C-1 side or C-2-C-2 side) and is configured as a product take-out part. The D-D line indicates the direction of product removal.

The shaft hole 71 may have a plurality of bottomed side holes that communicate with each other alternately and form a through hole extending from one end surface to the other end surface in the longitudinal direction.
As in the embodiment of the present invention, the handle bottom 45 is attached, and the shaft hole 7
1 ends at the shaft bottom 72, and some have only one end open.

As can be seen from FIG. 3, which shows the cross section of the handle, the inner wall 81 of the handle, which becomes the shaft hole 71, has a polygonal/circular shape corresponding to the cross-sectional shape of the base 8 of the tool to be inserted.

The outer wall 82 of the handle is the part that becomes the handle, and its cross section may be triangular, quadrilateral, polygonal (including shapes with chamfered corners), circular (including elliptical), etc. depending on the purpose of the tool. Bye.

Even if the inner wall 81 is simply smooth, if the cross-sectional shape is different from the cross-sectional shape of the base 8 of the tool, the shaft hole 71 will come into strong contact with each other in a line or point. By providing protruding columnar or plate-like small protrusions 61, 62, 63, 64, etc., the corresponding width can be increased.

Convex film-like or concave grooves 51, 52, etc. may be provided on one side or all sides of the handle at the same time when the handle is molded.

Furthermore, the flange 9 is placed at an appropriate location on the handle, for example at the tip near the shaft hole 71 (or at the proximal end of the handle depending on the use of the tool).
1 may be provided.

"Actions and Effects of the Present Invention" The handle of the present invention having the above-described structure has the following features compared to conventional handles.

(1) By providing a plurality of bottomed side holes that communicate with each other alternately on one side wall and the opposite side wall, it is possible to make shaft holes that are extremely difficult to machine without the need for a drilling process. This can be achieved by opening and closing only the parting line, which greatly reduces costs. At the same time, it is possible to create a continuous space even in extremely long handles or tubular bodies that continuously extend to infinity by simply machining the side walls. can.

In addition, since the shaft hole is not drilled or the like, shaft holes of any size can be obtained in various places, and the shape can be arbitrarily selected.

(2) The outer wall of the handle and the inner wall of the shaft hole can be formed in any combination by simultaneous molding. If the shaft hole is tapered, it will be better fixed when the base of the tool is driven into the tool, and the inner wall of the polygonal shaft hole will be in particularly strong contact.

(3) If the inner wall of the shaft hole has a circular cross-section, it is suitable for use as a long handle by passing the shaft hole through the front and back of the handle.

(4) If a small protrusion integrally made of the same material is provided on the inner wall of the shaft hole, the handle can be fixed extremely firmly when inserted into the base of the tool under pressure.

Furthermore, the results are even more favorable when the material has elasticity.

(5) It is common practice to create an uneven pattern on the surface of the handle to prevent slipping, but the grooves are also effective for preventing slipping and for evenly distributing the thickness of the entire handle.

That is, when injection molding is performed using thermoplastic synthetic resin as a material, the thicker parts shrink more than other thinner parts when the temperature returns to room temperature after molding, and the product is more likely to have dents.

By providing the concave groove in a part of the thick side of the handle, avoiding the part with the bottomed side hole, the cooling rate during molding can be lowered to a predetermined temperature evenly and quickly in each part, improving production efficiency.

(6) If the handle of a tool such as a file or chisel that is pressed to process the tool has a flange at the tip near the shaft hole opening, it will put more force into the work.

In addition, for handles of factory tools that must not be dropped during high-place work, etc., handles with a flange at the rearmost part are safer.

(7) By using thermoplastic, thermosetting, and compressed solid industrial materials instead of using natural wood, it is possible to make homogeneous products without streaks or directionality, and even complex shapes can be created using the matrix. Once one piece is completed, mass production is possible, and by pre-mixing inorganic and organic foam materials and molding, it is possible to create a uniform product with an appearance similar to natural wood.

As mentioned above, the pattern composed of the structure of the present invention is
It is a practical idea with unprecedented effectiveness.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view taken along axis A-A in Fig. 1, and Fig. 3 is a cross-sectional view taken along line B-B in Fig. , Figure 4 is the third
FIG. 5 is an enlarged cross-sectional view of the figure and a plan view of the state in which the base of the tool is inserted as the handle of the file. 1... One side wall, 2... Opposite side wall, 8...
... Base of the tool, 21, 22 ... Bottomed side hole on one side wall, 31, 34 ... Bottomed side hole on the opposite side wall,
51, 52... Concave groove, 61, 62, 63, 64...
...Small convexity, 71...Shaft hole, 81...Inner wall of shaft hole,
82... Outer wall of handle, 91... Tsuba.

Claims (1)

[Claims for Utility Model Registration] 1. A side hole with a bottom formed in one side wall of a substantially rectangular parallelepiped at the substantially center of one end surface in the longitudinal direction, and holes formed at intervals in the longitudinal direction from the side hole with a bottom. At least one bottomed side hole and at least one other bottomed side hole bored approximately in the longitudinal center of the side wall opposite to the side wall so as to communicate with the bottomed side hole; A handle made of a thermoplastic or thermosetting synthetic resin material or a compressed solid material, characterized in that a shaft hole is formed approximately in the center in the longitudinal direction by a plurality of bottomed side holes that communicate with each other in an alternating manner. 2. The handle according to claim 1, wherein the inner wall of the shaft hole is polygonal or circular in shape corresponding to the cross-sectional shape of the base of the tool to be inserted. 3 Utility model registration claim No. 1 in which a large number of small protrusions made of the same material are provided on the inner wall of the shaft hole
The pattern described in Section 2 or Section 2. 4. The handle according to any one of claims 1 to 3 of the utility model registration claims, wherein a groove is provided on one side or a part of all sides of the thick side part other than the part where the bottomed side hole is located.