JP4180362B2 - Small hammer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small manual hammer used for fine work and the like.
[0002]
[Prior art]
Conventionally, the head and the handle of a hammer for manual operation are connected to each other by driving a wedge member into the handle insertion hole formed in the head along the longitudinal direction of the handle so that the handle is placed on the head. Generally, it is joined by pressing it by expanding it into the hole, but in the case of a small hammer used for fine work etc., when the wedge member is driven, the handle part breaks and the strength decreases and it is easy to break In addition, because the space for driving the wedge member is not sufficient, the roll pin 11 is normally driven perpendicularly to the handle insertion hole 12 as shown in FIG. And the handle portion 14 are combined. As a prior art document similar to this coupling method, for example, there is Patent Document 1.
[0003]
In addition, as shown in FIG. 3, the small hammer used for the fine work has a head 13 separated into a head main body 13a and a replacement head 13b. Depending on the material, etc., the replacement head 13b can be replaced each time with resin, soft metal, wooden, etc. As a configuration for this, a male screw 16 is formed on the head body 13a. A female screw hole 17 to be screwed into the male screw 16 is formed in the replacement head portion 13b. As a prior art document of this method, for example, there is Patent Document 2.
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 6-71078 [Patent Document 2]
Japanese Patent Laid-Open No. 7-205046
[Problems to be solved by the invention]
However, in the conventional connecting structure of the head 13 and the handle portion 14 by the roll pin 11, the handle portion 14 becomes thin and thin with use due to drying or the like, and a gap is formed in the handle portion insertion hole 12. There was a problem that rattling occurred in the portion 14. In particular, in the case of a small hammer, since it is often used for fine work, the above-mentioned rattling becomes a fatal injury and needs to be repaired each time. This repair cannot be dealt with at all by, for example, replacing the roll pin 11. Normally, the narrowed portion of the tip of the handle portion 14 is cut off and the thick portion is shaved to match the hole 12. It is necessary to reopen the insertion hole 15 at the tip of the handle portion 14, and repair for preventing rattling is not easy. Moreover, such a repair cannot be repeated many times because the handle portion 14 becomes shorter each time, and improvement has been demanded (the same applies to Patent Document 1).
[0006]
In addition, the coupling | bonding of the head part and handle | steering_wheel part in patent document 2 is screwing together both members, and screwing the set screw (set screw) from the direction orthogonal to this, and is preventing rotation, This set screw is , It is provided separately from the screw for connecting the replacement head to the head body, which not only increases the number of parts and man-hours for screw hole processing, but also is a small size especially used for fine work In the case of a hammer, the handle is made of wood or bamboo for weight reduction, and it is difficult to form a male screw at the tip of the handle. There are problems such as.
[0007]
Therefore, in view of the above-mentioned problems and demands, the present invention provides a small replacement head type hammer that facilitates repair of rattling of the head and handle, reduces the number of parts and processing steps, and has a simple configuration. It is what you do.
[0008]
[Means for Solving the Problems]
The technical means of the present invention for solving this technical problem has a handle insertion hole and a replacement head coupling surface orthogonal to the handle insertion hole, and the handle insertion hole in the replacement head connection surface A head body in which a set screw hole reaching the cross section is formed perpendicularly to the handle insertion hole, a replacement head in which a screw hole having the same screw hole diameter as the set screw hole of the head body is formed, and the head consists of a sum of the length and the length of the threaded bore of the replacement head of set screw holes of the main body and set screw which is substantially the same length, the handle part and which is inserted and fixed to the handle portion insertion hole, said stopper By screwing the screw into the set screw hole of the head body, and pressing the tip of the set screw against the tip side of the handle part inserted into the handle part insertion hole of the head body from the direction orthogonal to the handle part insertion hole The head body and the handle are fixed, and the set screw is replaced with the head body. To protrude from the mating surface, by screwing the screw hole of the head replacement on the protrusion, is characterized by the replacement head has to bind to the head body.
[0009]
According to this configuration, the head and handle shakiness can be repaired by cutting away the tip of the handle that has become thinner as in the past, cutting out the thicker portion, and further eliminating the trouble of drilling the roll pin hole. Then, the head can be removed and the set screw can be tightened to eliminate rattling between the head and the handle, and can be repeated any number of times. Then, after removing the backlash of the head and the handle by tightening the set screw, the head of the head and the handle can be repaired easily and easily because the replacement head can be screwed back to the original position. In addition, the length of the handle portion is not shortened even after repeated repairs, and the original length can be maintained, so that the balance after repair does not change and the usability does not deteriorate. Furthermore, the set screw can be used both as a fixing means for the head and handle and a means for connecting the head body and the replacement head, thereby reducing the number of parts and the number of processing steps. It is possible to simplify the configuration of the partial type small hammer.
[0010]
The technical means of the present invention is characterized in that an engagement recess for a driver tool such as a square hole, a minus groove, a plus groove, or the like is formed on the head of the set screw.
According to this configuration, when performing a fixing operation between the head and the handle, the set screw can be easily tightened with an appropriate driver tool.
Further, in the case of the head body having the replacement head coupling surfaces at both ends, the technical means of the present invention is configured to connect the replacement head and the head body at least at one end to the head body and the handle by the set screw. It is characterized in that the fixing means for the part and the connecting means for the head main body and the replacement head are combined.
[0011]
According to this configuration, when the replacement head is coupled to both ends of the head body, both may be the coupling structure of the present invention, but in some cases, only one coupling structure is the coupling structure of the present invention, and the other is Another coupling structure (for example, a conventional coupling structure) may be used.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show an embodiment of a small hammer according to the present invention. The small hammer according to the present invention has a head 1 separated into a head main body 1a and a replacement head 1b, and the replacement head 1b is made of resin according to the contents of work and the material of the work object. It is the same as in the prior art in that it can be replaced each time with a metal, soft metal, wooden, hard metal, etc., but the fixing means between the head 1 and the handle 2 and the head The point which combined the coupling | bonding means of the main body 1a and the replacement head 1b with the set screw 3 is different from the past.
[0013]
As a configuration for that purpose, a handle portion insertion hole 4 and a replacement head coupling surface 5 orthogonal to the handle portion insertion hole 4 are formed in the head body 1 a, and the handle portion insertion hole 4 is formed in the replacement head connection surface 5. Is formed so as to penetrate through the set screw hole 6 that reaches
A screw hole 7 having the same screw hole diameter as the set screw hole 6 of the head main body 1a is formed in the replacement head 1b. The screw hole 7 is a blind hole with a bottom closed.
The set screw 3 has substantially the same length as the sum of the length of the set screw hole 6 of the head body 1a and the length of the screw hole 7 of the replacement head 1b. Male threads are engraved on the surface. An engagement recess 8 for a driver tool such as a square hole, a minus groove, and a plus groove is formed at the head of the set screw 3.
[0014]
The head main body 1a is made of brass or other metal material, and the handle 2 is usually made of wood (such as cocoons) or bamboo for weight reduction. The tip of the handle 2 is cut into a shape that fits the handle insertion hole 4 of the head body 1a. The handle portion insertion hole 4 is usually an oval shape, but may have another shape.
The configuration of the embodiment of the small hammer according to the present invention is as described above, and in order to fix the head 1 and the handle 2, the tip of the handle 2 is inserted into the handle insertion hole 4 of the head body 1 a. The set screw 3 is screwed into the set screw hole 6 using an appropriate driver tool, and the tip of the set screw 3 is pressed against the tip side surface of the handle 2 (see FIG. 2). As a result, the fixing of the head 1 and the handle 2 is completed.
[0015]
Next, in order to couple the head body 1a and the replacement head 1b, the head of the set screw 3 is used. For this purpose, the set screw 3 has substantially the same length as the sum of the length of the set screw hole 6 of the head body 1a and the length of the screw hole 7 of the replacement head 1b. 2, the head of the set screw 3 protrudes from the head body 1a by an amount corresponding to the length of the screw hole 7 of the replacement head 1b, as shown in FIG. The screw hole 7 of the replacement head 1b is screwed into this protrusion, and the replacement head 1b is pressed against the replacement head coupling surface 5 of the head body 1a. This completes the connection between the head body 1a and the replacement head 1b.
[0016]
When the replacement head 1b is replaced with another one, the original one is removed and a new one is replaced. If the head 1 is rattled with respect to the handle 2, the replacement head 1 b is temporarily removed to expose the head of the set screw 3, and an appropriate driver tool is inserted into the engaging recess 8. By engaging and screwing, the distal end of the set screw 3 is pushed forward, and the distal end portion of the handle portion 2 is strongly pressed against the handle portion insertion hole 4 of the head body 1a to remove the gap, thereby eliminating rattling. Thereafter, the rattling repair is completed by screwing the replacement head 1b back to the original position.
[0017]
As described above, according to the embodiment of the present invention, the backlash of the head portion 1 and the handle portion 2 is repaired by cutting off the tip portion of the handle portion that has been thinned as in the prior art, and scraping out a thick portion, and further rolling pin holes It is simple and easy to simply remove the replacement head 1b and tighten the set screw 3, and then screw the replacement head 1b back to the original position. In addition, the length of the handle 2 is not shortened even after repeated repairs, and the original length can be maintained, so that the usability after repair does not deteriorate. Furthermore, by using the set screw 3 as a fixing means for the head 1 and the handle 2 and a connecting means for the head main body 1a and the replacement head 1b, the number of parts and the number of processing steps can be reduced. This makes it possible to simplify the construction of this type of replaceable head type small hammer.
[0018]
The present invention is not limited to the above embodiment. That is, when the replacement head 1b is coupled to both ends of the head body 1a, both may be the coupling structure of the present invention. However, depending on the case, only one coupling structure may be the coupling structure of the present invention, and the other A coupling structure (for example, a conventional coupling structure) may be used.
[0019]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, it becomes easy to repair the rattle of a head and a handle | pattern part, and also it becomes possible to reduce the number of parts and processing man-hours, and to provide the small hammer of a replacement head system with a simple structure.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an embodiment of a small hammer according to the present invention.
FIG. 2 is a cross-sectional view showing a combined state of a head and a handle in an embodiment of a small hammer according to the present invention.
FIG. 3 is an exploded perspective view of a conventional small hammer.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Head 1a Head main body 1b Replacement head 2 Handle part 3 Set screw 4 Handle part insertion hole 5 Replacement head coupling surface 6 Set screw hole 7 Screw hole 8 Engaging recess

Claims (3)

A handle insertion hole and a replacement head coupling surface orthogonal to the handle insertion hole are formed, and a set screw hole reaching the handle insertion hole is formed through the replacement head coupling surface perpendicularly to the handle insertion hole. The head body,
A replacement head in which a screw hole having the same screw hole diameter as the set screw hole of the head body is formed,
A set screw having substantially the same length as the sum of the length of the set screw hole of the head body and the length of the screw hole of the replacement head;
It consists of a handle portion that is inserted and fixed in the handle portion insertion hole,
The set screw is screwed into the set screw hole of the head body, and the tip of the set screw is brought into pressure contact with the tip side surface of the handle portion inserted into the handle portion insertion hole of the head body from the direction orthogonal to the handle portion insertion hole. By fixing the head main body and the handle portion, and projecting the set screw from the replacement head coupling surface of the head main body, and screwing the screw hole of the replacement head into this protrusion, A small hammer characterized in that the part is coupled to the head body .   The small hammer according to claim 1, wherein an engagement recess for a driver tool such as a square hole, a minus groove, a plus groove, or the like is formed in a head of the set screw.   In the case of the head body having the replacement head coupling surface at both ends, at least one end of the replacement head and the head body is coupled with the fixing means of the head body and the handle by the set screw, and the head body The small hammer according to claim 1 or 2, characterized in that it is also used as a means for coupling with the replacement head.

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