JPH0736721Y2 - Foldable blade - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a foldable blade in which blades such as saws, knives, and sickles are foldable so that they can be inserted into and removed from the handle. In particular, the present invention relates to an improvement of a portion of a support shaft that pivotally attaches a blade portion to a tip portion of the handle portion.

(Prior Art) Generally, the blade portion 3 is rotatably supported on the tip portion of the handle portion 1 in the following manner. That is, the handle 1
A screw insertion hole 5 is formed at the tip of the blade and the blade portion 3
A shaft hole 6 is bored in the shaft portion, a blade portion 3 is sandwiched in a gap 2 formed between both side plates of the handle portion, and the handle portion 1 is provided in the screw insertion hole 5 and the shaft hole 6.
The screw 4 is inserted from one side, and the nut 7 is screwed to the tip of the screw from the other side.

By the way, when the screw 4 is strongly tightened with respect to the nut 7, the swiveling operation between the folded storage posture of the blade portion 3 with respect to the handle portion 1 and the posture in which the blade portion 3 is taken out toward the front is firm and can be smoothly performed. There is no problem. Therefore, screw 4
The nut 7 is tightened with a loose eye.

(Problems to be solved by the invention) However, if the screws and nuts are tightened loosely as described above, the screws may become looser and play may occur due to the swinging motion of the blade and vibration during cutting. Finally, there was a problem that the nut came off the screw.

An object of the present invention is to provide a foldable blade that solves the above problems.

(Means for Solving the Problem) A folding blade according to the present invention is a foldable blade in which a blade portion 3 is rotatably rotatably supported by a screw 4 and a nut 7 between both side plates of a handle portion 1. In the cutting tool, the screw 4 which is almost a spindle is provided at a position facing the screw head 4a of one handle side plate.
Is provided with a recess 8 into which the head 4a can be fitted, and an elastic ring 10 is fitted on the screw 4 so as to be sandwiched between the screw head 4a and the bottom 8a of the recess 8. .

The elastic ring referred to here is an annular ring made of an elastic and deformable material such as rubber or soft plastic.

(Operation) The present invention operates as follows.

By tightening the screw 4 and the nut 7, the elastic ring 10 is sandwiched between the bottom portion 8a of the recess 8 and the screw head 4a and tries to deform into a flat shape. Since the deformation that tends to spread is prevented by the side wall of the recessed portion 8, it is inevitable that the deformation expands inward. Then, the inward expanding deformation of the elastic ring 10 eventually causes the screw 4 to be tightened by receiving a strong contact pressure from the elastic ring 10, and as a result, the situation in which the screw 4 becomes difficult to rotate is promoted. is there.

(Effects of the Invention) As is clear from the above description, therefore, in the folding blade according to the present invention, by tightening the screw and the nut, the screw receives a strong contact pressure from the elastic ring and is tightened. As a result, the situation in which the screw becomes difficult to turn is promoted, so the screw loosens more and more loosely due to the turning motion of the blade and the vibration during cutting.
There is no chance that the nut will come off the screw. Further, since the screw does not loosen even if the nut and the screw are not tightly tightened, it is possible to smoothly perform the swiveling operation of the blade portion between the stored state and the pulled-out state.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention.
In these figures, reference numeral 1 is a handle portion of a folding saw, and the handle portion 1 is formed with a space 2 which is divided into two by both side plates, and the blade portion 3 of the saw is sandwiched in the space 2. A screw insertion hole 5 is formed in the tip portion of the handle portion 1, a shaft hole 6 is formed in the blade portion 3, and a screw 4 serving as a spindle is inserted into the screw insertion hole 5 and the shaft hole 6 from one side. To do. Then, the blade portion 3 is connected to the handle portion 1 by screwing a nut 7 onto the tip of the screw 4 from the other side. In other words, as shown in FIG. 1, the blade portion 3 is pivoted so as to be pivotable between a use posture that extends substantially in a straight line with respect to the handle portion 1 and a storage posture that is folded in the space 2. Be worn.

The screw head 4a of the handle part 1 is located at a position facing the screw head 4a, and the screw 4
Is provided with a cylindrical recess 8 into which the screw head 4a can be fitted, and at a location where the nut 7 of the handle portion 1 is opposed, a hexagonal shape is seen from a cross section so as to conform to the shape of the nut 7. Recess 9
Is provided. The elastic ring 10 is fitted to the screw 4 as shown in FIG. 2 so that the elastic ring 10 is sandwiched between the screw head 4a of the screw 4 and the bottom 8a of the recess 8.

The elastic ring 10 has an annular shape made of an elastic and deformable material such as rubber or soft plastic,
By tightening the screw 4, it is pressed against the bottom surface 8a of the recess 8 inside the screw head 4a.

Next, FIG. 3 shows a second embodiment of the present invention, in which the bottom surface of the concave portion 8 is formed into a tapered surface which becomes gradually deeper toward the central portion. In this embodiment, the screw 4
As the screws are tightened, the screws 4 and the nuts 7 receive a pressing force toward the outside of both side plates of the handle as shown by the arrows, so that it is difficult for the screws 4 to turn and the nuts 7 are prevented from coming off the screws 4. it can.

[Brief description of drawings]

1 and 2 show a first embodiment of a folding blade according to the present invention. FIG. 1 is a side view of a main part, and FIG.
FIG. 3 is a sectional view as seen from the direction of arrow II-II in FIG. 3, and FIG. 3 is a sectional view corresponding to FIG. 2 in a second embodiment of the folding blade according to the present invention. 1: Handle, 2: Void, 3: Blade, 4: Screw, 7: Nut, 8: Recess,
10: Elastic ring.

Claims (1)

[Scope of utility model registration request] 1. A foldable blade in which a blade portion 3 is rotatably and rotatably supported by a screw 4 and a nut 7 between both side plates of a handle portion 1 in a screw head 4a of one handle side plate. A recess 8 is provided at a position facing each other so that the head 4a of the screw 4, which is a spindle, can be fitted therein, and the elastic ring 10 is attached to the screw 4 as if it is sandwiched between the screw head 4a and the bottom 8a of the recess 8. A foldable blade characterized by being fitted with.