JPH0435571B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to handles for hand tools, and more particularly to handles for hand tools such as shovels and shovels.

(Prior art) In the past, all grips for hand tools such as shovels and scoops were made of wood, but due to the recent shortage of wood resources, thin steel plates have been used exclusively as a substitute. A grip is formed by bending the grip, and a wooden or steel pipe rod is inserted into the base of the grip to secure it, but this requires a considerable amount of time and effort to manufacture and is expensive. There was also the problem that it was expensive.

Therefore, as a grip that is easy to manufacture and inexpensive, for example, as shown in Japanese Utility Model Publication No. 52-39281, there is an insertion part into which a handle rod is inserted and fixed, and a fork part extending in a fork shape from this insertion part. A grip consisting of a handle and a handle provided between the tips of the fork parts is integrally formed of synthetic resin, and is fixed by inserting a handle into the insertion part of the grip. There is.

(Problem to be Solved by the Invention) However, in the conventional handle described above, since the insertion portion formed in the grip is simply a recessed hole, it is only necessary to insert the handle rod into the insertion portion and fix it. However, there was a problem in that the connection between the handle and the grip was weak, and if an unbalanced load was applied in the left-right direction to the scooping body attached to the tip of the handle, the handle would rotate relative to the grip.

In particular, when using a wooden handle, the handle dries and becomes thinner, and this wood thinning creates a gap between the insertion part and the handle, allowing the handle to rotate relative to the grip. In addition to this, there was a problem in that the insertion part and the handle rod became loose.

An object of the present invention is to reliably prevent the handle rod from rotating and wobbling relative to the grip by devising the shape of the insertion portion and the shape of the end portion of the handle insertion side in a grip made of synthetic resin. The purpose of the present invention is to provide a handle for a hand tool.

(Means for Solving the Problems) Accordingly, the present invention includes a handle rod 1, an insertion portion 21 into which the handle rod 1 is inserted and fixed, and a fork portion 22 extending in a fork shape from the insertion portion 21. and a grip 2 which is integrally formed of synthetic resin with a grip part 23 provided between the tips of the fork parts 22, and the grip 2 has a grip part 23 provided between the tips of the fork parts 22. The base is tapered from the base in the insertion direction to the tip in the insertion direction so that the base can fit tightly into the inner surface of the opening side of the insertion portion 21 of the grip 2, and the handle rod An engagement groove 13 is provided in the insertion side tip 12 of the insertion part 21, and the engagement groove 13 of the handle rod 1 is engaged with the inner surface of the insertion inner part of the handle rod 1 in the insertion part 21, The insertion side tip 12 of the handle rod 1 is integrally formed with an engaging piece 24 having a wedge-shaped cross section that presses against the inner surface of the insertion part 21.

(Function) With the above configuration, the insertion portion 21 of the grip 2
When fixing by inserting the insertion side end of handle rod 1 into
An engagement piece 24 having a wedge-shaped cross section provided on the insertion portion 21 spreads out the engagement groove 13 of the insertion side tip 12 of the handle rod 1 by a wedge action, so that the outer circumferential surface of the insertion side tip 12 is The base of the insertion side end is engaged with the engagement groove 13 while pressing against the inner surface of the insertion part 21, and is tapered from the base in the insertion direction to the tip in the insertion direction. is the insertion part 2
It fits tightly into the inner surface of the opening side of the opening.

As a result, the engagement piece 24 is engaged with the distal engagement groove 13 at the insertion end of the handle rod 1, and the base is tightly fitted into the insertion portion 21 at the insertion end. As a result, the handle rod 1 can be firmly fixed to the grip 2 in a manner that it cannot rotate relative to the handle rod 1. It is possible to reliably prevent rotation and wobbling.

Therefore, even if the wooden handle rod 1 dries and becomes thin while using the wooden handle rod 1, the insertion side end of the handle rod 1 will not fit into the engagement groove of the engagement piece 24. 13 due to the wedge action, the effect of thinning of the wood can be reduced, and even if there is shrinkage due to thinning of the wood, in this case, the engagement groove 13 will not fit into the engagement piece. Since the action of tightening 24 occurs, the engagement piece 24 and the engagement groove 1
As a result, even if wood thinning occurs in the wooden handle rod 1, the wooden handle rod 1 is firmly engaged.
This prevents the grip from turning easily against the grip or from rattling.

(Example) Next, to explain an example, FIG. 7 shows a shovel to which the hand tool handle of the present invention is applied.
In the figures and FIG. 5, reference numeral 1 denotes a wooden handle rod with a scooping body A attached to one end, and the other end of the handle rod 1 has an insertion side end into an insertion portion 21 of a grip 2, which will be described later. The section has a small diameter through the stepped section 11 and is formed in a tapered shape from the base in the insertion direction to the tip in the insertion direction, and is engaged in a V-shape with the tip surface of the insertion side tip 12. A groove 13 is formed.

Reference numeral 2 denotes an insertion portion 21 into which the tip 12 of the handle rod 1 is inserted and fixed, fork portions 22, 22 extending in a fork shape from the insertion portion 21, and a portion between the tip portions of these fork portions 22, 22. The grip 2 is integrally formed with a grip portion 23 of synthetic resin, and is engaged with the engagement groove 13 of the handle rod 1 on the inner surface of the insertion depth of the handle rod 1 in the insertion portion 21. An engaging piece 24 having a wedge-shaped cross section is integrally formed to press the insertion side tip 12 of the handle rod 1 against the inner surface of the insertion part 21.

In the embodiment shown in the figure, the engagement piece 24 includes:
As shown in FIGS. 1 and 4, a pair extending on the longitudinal center line wedge-shaped engagement piece 24,
24 are formed to protrude from both sides of the insertion portion 21 in opposite directions.

Furthermore, as shown in FIG. 5, the engagement groove 13 is formed to extend in the same direction as the grain of the wood in the handle rod 1, so that the bending load acts in the grain direction when the shovel is used. It is installed.

In FIGS. 2 and 6, 25 indicates the insertion portion 21
This is a nail hole for a fixing nail 3 formed near the opening side of the grip part 23 and aligned with the longitudinal center line of the grip part 23, similar to the engaging piece 24.

Further, the insertion portion 21 and the insertion side tip portion 12 do not necessarily need to be connected using the nail 3.

Further, instead of the connection using the nails 3, an adhesive may be used, or if the handle rod 1 is a metal pipe, the connection may be performed using a connecting pin or a blind rivet.

For example, when a metal pipe is used, a through hole such as a connecting pin is formed in the insertion part 21 of the grip 2 in place of the nail hole 25, and a through hole such as a connecting pin is formed in the insertion side tip of the pipe-shaped handle 1. Engagement groove 1
3, and a through hole for the connecting pin is formed at a position that corresponds to the through hole.

The present invention is constructed as described above, and when the insertion side tip 12 of the handle rod 1 equipped with the scooping body A is inserted into the insertion portion 21 of the grip 2 and fixed, the handle rod The handle rod 1 is inserted into the grip 2 while aligning the engaging pieces 24 so that they fit into the engaging grooves 13 formed on the insertion side tip 12 of the handle.

In this case, the engaging pieces 24, 24 and the nail hole 25
is disposed on the longitudinal center line , 24 can be inserted into the engagement groove 13.

By this insertion, the engagement piece 24 is inserted into the engagement groove 13.
The engagement groove 1 is pushed apart by a wedge action to bring the outer circumferential surface of the insertion tip 12 into pressure contact with the inner surface of the insertion portion 21.
3, and the base of the insertion side end, which is tapered from the base in the insertion direction to the tip in the insertion direction, is on the inner surface of the opening side of the insertion part 21. This results in a tight fit.

As a result, the engagement piece 24 is engaged with the distal engagement groove 13 at the insertion end of the handle rod 1, and the base is tightly fitted into the insertion portion 21 at the insertion end. By this, it is possible to connect the handle rod 1 at two points, the tip and the base at the insertion side end, so that the handle rod 1 cannot rotate relative to the grip 2, and
It is firmly fixed.

After that, a nail is driven into the nail hole 25 of the insertion part 21 to connect the insertion part 21 and the handle rod 1.

Therefore, even if an unbalanced load is applied to the scoop body A attached to the tip of the handle, the handle 1 is moved to the grip 2 by the engagement of the engagement piece 24 with the engagement groove 13.
Since it is fixed so that it cannot rotate relative to the grip, it is possible to reliably prevent the handle rod from turning around with respect to the grip.

Furthermore, when the wooden handle rod dries and becomes thinner, the engagement groove 13 acts to pinch the engagement piece 24 as the wood shrinks due to the thinning.
The engagement between the engagement piece 24 and the engagement groove 13 may be strong enough to make it easier for the handle to rotate relative to the grip, or play may occur between the insertion portion and the handle. There isn't.

Furthermore, the engaging pieces 24, 24 are positioned on the longitudinal center line
In addition, since the engaging pieces 24, 24 are connected in a direction perpendicular to the length direction thereof, the direction in which these engaging pieces 24, 24 are connected is as follows.
The direction is the same as the direction of the bending load normally applied to the handle rod 1 when the shovel is used, so that the bending load does not directly act as a force that damages the engagement pieces 24, 24.

Furthermore, when the insertion portion 12 and the insertion side tip portion 12 are connected using the nail 3 or the connecting pin, the tip of the insertion side tip portion 12 is engaged with the engagement piece 24. Therefore, it is not necessary to do it at two places, the tip side and the base side of the insertion side tip part 12 as in the conventional case, and it is only necessary to nail or pin the tip part at one place on the base side. This makes it possible to reduce the effort required to connect the nails 3 or the connecting pins, and also to prevent the strength of the grip from decreasing due to the formation of the nail holes 25 and the connecting pin insertion holes.

(Effects of the Invention) As described in detail above, the hand tool handle of the present invention includes the wooden handle rod 1, the insertion part 21 into which the handle rod 1 is inserted and fixed, and the insertion part 21. In a handle for a hand tool, the grip 2 includes a fork portion 22 extending in a bifurcated shape and a grip portion 23 provided between the tips of the fork portions 22, which are integrally formed of synthetic resin. The side end is tapered from the base in the insertion direction to the tip in the insertion direction, and the base is connected to the grip 2.
The insertion portion 21 is formed to be able to fit tightly into the inner surface of the opening side of the insertion portion 21, and an engagement groove 13 is provided in the insertion side tip portion 12 of the handle rod 1.
The inner surface of the insertion back part of the handle rod 1 in 1 is engaged with the engagement groove 13 of the handle rod 1, and the insertion side tip 12 of the handle rod 1 is pressed against the inner surface of the insertion part 21. Since the engagement piece 24 having a wedge-shaped cross section is integrally formed, the insertion portion 21 of the grip 2
When fixing by inserting the insertion side end of handle rod 1 into
An engagement piece 24 having a wedge-shaped cross section provided on the insertion portion 21 spreads out the engagement groove 13 of the insertion side tip 12 of the handle rod 1 by a wedge action, so that the outer circumferential surface of the insertion side tip 12 is The insertion side end can be engaged with the engagement groove 13 while pressing against the inner surface of the insertion part 21, and is tapered from the base in the insertion direction to the tip in the insertion direction. The base of the part can be tightly fitted to the inner surface of the opening side of the insertion part 21.

As a result, the engagement piece 24 is engaged with the distal engagement groove 13 at the insertion end of the handle rod 1, and the base is tightly fitted into the insertion portion 21 at the insertion end. As a result, the handle rod 1 can be firmly fixed to the grip 2 in a manner that it cannot rotate relative to the handle rod 1. It is possible to reliably prevent rotation and wobbling.

Therefore, even if the wooden handle rod 1 dries and becomes thin while using the wooden handle rod 1, the insertion side end of the handle rod 1 will not fit into the engagement piece 24 of the engagement groove 13. Since the engagement groove 13 is pushed wider by the wedge action caused by the engagement, the influence of thinning of the wood can be reduced. 13 has the effect of tightening the engagement piece 24, so that the engagement piece 24 and the engagement groove 13 are more firmly engaged. Also, it is possible to prevent the handle rod 1 from becoming easy to turn with respect to the grip or from shaking.

[Brief explanation of drawings]

Fig. 1 is a partially omitted longitudinal cross-sectional view of the hand tool handle according to the present invention, Fig. 2 is a front view of the grip, Fig. 3 is a side view of the same, and Fig. 4 is a longitudinal cross-sectional view of essential parts of the grip. , Figure 5 is an explanatory diagram of the insertion side tip of the handle rod,
FIG. 6 is a longitudinal sectional side view of the essential parts, and FIG. 7 is an overall explanatory view of a shovel using the hand tool handle of the present invention. 1... Handle, 2... Grip, 12... Insertion side tip, 13... Engagement groove, 21... Insertion part, 22
...Fork part, 24...Grip part.

Claims (1)

[Claims] 1. A wooden handle 1, an insertion part 21 into which the handle 1 is inserted and fixed, a fork part 22 extending in a fork shape from this insertion part 21, and a grip provided between the tips of these fork parts 22. A handle for a manual tool comprising a grip 2 integrally formed with a portion 23 of synthetic resin, and the insertion end of the handle rod 1 is directed from the base in the insertion direction to the tip in the insertion direction. The base portion is tapered to the grip 2.
The insertion portion 21 is formed to be able to fit tightly into the inner surface of the opening side of the insertion portion 21, and an engagement groove 13 is provided in the insertion side tip portion 12 of the handle rod 1.
The inner surface of the insertion back part of the handle rod 1 in 1 is engaged with the engagement groove 13 of the handle rod 1, and the insertion side tip 12 of the handle rod 1 is pressed against the inner surface of the insertion part 21. A handle for a manual tool, characterized in that an engaging piece 24 having a wedge-shaped cross section is integrally formed.