JPH0625293Y2 - Foldable blade stopper mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a stopper mechanism for back-holding a sword blade such as a foldable knife, a sickle, a saw, etc., in a state in which the blade is projected from a handle and is used. .

(Prior Art) A conventional stopper mechanism will be described with reference to FIG. Reference numeral 1 is a handle made of a side plate 2. A base end portion of the blade 3 is rotatably supported at a front end portion between the side plates 2 so as to be rotatable. Reference numeral 5 denotes a stopper pivotally supported between the side plates 2 of the handle 1 so that the tip projection 7 can be engaged with and disengaged from the engagement recess 8 formed at the base end of the blade 3. 9 is the convex portion 7 of the stopper 5
Is a spring for pressing against the engaging recess 8 of the blade 3.

(Problems to be solved by the invention) However, the above-mentioned conventional blade stopper mechanism is
Since the tip convex portion 7 of the stopper 5 is pressed against the engaging concave portion 8 of the blade 3 by the force of the spring 9, the force for stopping the blade 3 back is weak and it is not always sufficient as a stopper mechanism. I couldn't say. Further, in the conventional stopper mechanism, the tip convex portion 7 of the stopper 5 is rotated by the rotation of the blade 3 to be inserted into the engaging concave portion 8 of the blade 3 so that they are engaged with each other. If it is not formed so as to be larger than 7 and to make a slight gap, the tip convex portion 7 cannot be inserted into the engaging concave portion 8 and therefore the both cannot be engaged. However, if the engaging concave portion 8 is formed to be larger than the tip convex portion 7 so as to form a slight gap, a gap 10 is generated when the both are engaged, which causes rattling during cutting and use, resulting in sharpness. It gets worse.

The present invention aims to eliminate such drawbacks.

(Means for Solving Problems) According to the present invention, the upper end of the blade is curved in the direction of the center line of the blade 13 at the base end of the blade 13 pivotally supported between the handle side plates 12. The cam protrusion 17a is formed, and the cam protrusion 17a
a stopper 15 having an engagement hole 15c that engages with the upper surface
Is provided between both side plates 12 of the handle, and the blade 13
A locking member 18 that engages with the lower surface of the cam projection 17a of
The stopper is pressed in the longitudinal direction of the blade by the spring force of the stopper itself or the spring 16 while the cam projection 17a is locked to the locking member 18 (action). When using the mechanism, the cam projection at the base end of the blade is engaged with the engagement hole formed in the stopper, and then the stopper is rotated by the spring that presses the stopper toward the front surface (longitudinal direction of the blade). Since the gap existing between the upper surface and the upper wall of the engagement hole is filled and the upper surface of the cam projection and the upper wall of the engagement hole contact each other, the blade does not rattle during use.

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

Reference numeral 11 is a handle made of a side plate 12. The base end of the blade 13 is pivotally supported 14 at the front end between the side plates 12. Reference numeral 15 is a "-shaped stopper having an engaging hole.
15f is fixed between the side plates 12 at a position close to the base end of the. The stopper 15 is constantly pressed to the front by a spring 16. It is also possible to form the stopper 15 with a leaf spring as shown in FIG. 4, and in this case, the stopper 15 itself has an urging force, and as shown by the imaginary line in FIG. Since it bends over 15e,
The spring 16 for pressing the stopper 15 to the front surface is unnecessary. Reference numeral 15b is an operation portion of the stopper 15 exposed from a through hole formed in the top wall of the handle 11. Reference numeral 17a is a cam projection formed on the base end of the blade, and the top surface of the tip is curved inward. The cam protrusion 17a and the engagement hole 15c are adapted to engage with each other. The reference numeral 18 indicates the side plate 1.
An engaging member provided between the two stops the blade 13 at a predetermined position.

Since the present invention is constructed as described above, the blade 13 is rotated about its axis by the cam projection 17a formed at the base end of the blade 13 in order to bring the blade 13 out of the stored state into a use state. The stopper 15 is pushed rearward against the pressing force of the spring 16, and the cam projection 17a is engaged with the engaging hole 15c of the stopper 15. Cam projection 17a and engaging hole 15c
In order for the and to be engaged by rotation, the engagement hole 15c must be formed so as to be larger than the cam projection 17a inserted into the engagement hole c and to form a slight gap, but in the present invention, the stopper 15c is formed. Is always pressed to the front (longitudinal direction of the blade), so the upper wall 15 of the engaging hole 15c of the stopper 15
Since e moves along the curve provided at the tip of the cam projection 17a until the engagement hole upper wall 15e and the upper surface of the cam projection 17a come into contact with each other, the blade 13 does not rattle. Since the force for locking the rotation of the blade 13 in the downward direction is not applied by the pressing force of the spring 16 as in the prior art but is applied to the fixing portion 15f of the stopper 15, the locking force is strong. Further, the rotation in the upward direction is locked by the lower surface of the cam projection 17a coming into contact with the locking member 18.

On the contrary, to move the blade 13 from the projecting state to the retracted state, the operating portion 15b of the stopper 15 is pushed diagonally rearward with a finger, and the stopper resists the force of the spring 15 and is shown by an imaginary line shown in FIG. So that the engaging hole upper wall 15e and the cam projection 17
A gap is formed between the upper surface of the tip of a and the blade can be rotated, and the blade is stored in the handle.

(Effect of the present invention) According to the present invention, the cam projection formed on the base end of the blade whose tip upper surface is curved inward, and the engagement formed on the stopper pressed in the blade longitudinal direction by the spring Since the blade is held back by engaging with the hole, there is no gap between the upper wall of the engaging hole and the upper surface of the cam projection, and therefore rattling does not occur during use. As a device for preventing rattling during use, there is a device described in Japanese Utility Model Publication No. 36-1676, but the structure of the present invention is extremely simple as compared with this. Particularly, if the stopper 15 is elastically deformed as shown in FIG. 3B, the spring 16 can be eliminated, which is more effective.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional foldable knife, FIG. 2 is a cross-sectional view of the foldable knife of the present invention, FIG. 3 is an enlarged explanatory view of essential parts, and FIG. The front view of the leaf spring which exists, (b) is the side view. Figure 5 is second
FIG. 4 is a sectional view of the vicinity of the stopper shown in FIG. 3 and FIG. 3.
FIG. 6 is an enlarged explanatory view of a main part when the stopper shown in FIGS. 4 (a) and 4 (b) is used. In the figure, 13 is a blade, 15 is a stopper, 16 is a spring, 1
Reference numeral 7 is a cam, 17a is a cam projection, and 18 is a locking member.

Claims (1)

[Scope of utility model registration request] 1. A cam projection 17a having a tip upper surface curved in the direction of the center line of the blade 13 is formed at the base end of the blade 13 rotatably supported between the handle side plates 12. Protrusion 1
Stopper 1 having engaging hole 15c that engages with the upper surface of 7a
5 is provided between both side plates 12 of the handle, and the blade 1
3 is provided with a locking member 18 that engages with the lower surface of the cam projection 17a, and the stopper is provided with the spring force of the stopper itself or the spring 1 when the cam projection 17a is locked to the locking member 18.
A foldable blade stopper mechanism characterized by being pressed in the longitudinal direction of the blade by 6.