JPH0659Y2 - Protective member locking device for round-edge cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a circular blade type cutter capable of blocking the exposure of the blade edge of a circular blade by a protective member when not in use.

(Prior Art) Conventionally, as a circular blade type cutter of this type, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 61-12489. In the same cutter, the protective member is movably supported with respect to the circular blade, and the blade tip facing portion formed on the protective member corresponding to the blade edge of the circular blade has an unused position that prevents the blade edge of the circular blade from being exposed. , The position of use allowing the exposure of the cutting edge can be taken.

(Problems to be solved by the invention) However, even if the protective member is moved to an unused position, when the external force is applied to the protective member, the protective member is inadvertently moved and the cutting edge of the circular blade is There was a problem in safety because it was sometimes exposed from the confronting part of the cutting edge.

The object of the present invention is to provide a circular blade type cutter with a protective member with a lock member to prevent the protective member from being inadvertently moved when not in use to prevent the blade edge of the circular blade from being exposed.
It is to improve safety.

Configuration of the Invention (Means for Solving the Problems) In the invention described in claim 1, the circular blade 7 is supported on the handle 1 and the protection member 23 is attached to the circular blade as shown in the drawings of each embodiment described later. 7 is movably supported in at least one direction A and B, and a blade edge facing portion 24a formed on the protection member 23 corresponding to the blade edge 7b on the outer periphery of the circular blade 7 prevents the edge 7b of the circular blade 7 from being exposed. In a circular blade type cutter capable of taking a non-use position and a use position that allows the blade edge 7b to be exposed, a lock member 37,
51 is movably supported with respect to the handle 1 and the protection member 23,
The lock members 37, 51 include locking portions 43, 44a, 54 for at least one of the handle 1 and the protective member 23.
Protecting member 2 is provided with engaging portions 40, 41, 53 for engaging and disengaging
The lock position P that prevents the movement of the No. 3 and the lock release position Q that allows the movement of the No. 3 can be taken.

The invention described in claim 2 supports the circular blade 7 on the handle 1 and moves the protective member 23 in two directions A and B with respect to the circular blade 7 as shown in the drawing of the first embodiment described later. A non-use position where the blade edge facing portion 24a, which is supported as much as possible, and which is formed on the protection member 23 in correspondence with the blade edge 7b on the outer periphery of the circular blade 7, blocks the exposure of the blade edge 7b of the circular blade 7, and the exposure of the blade edge 7b. In a circular blade cutter capable of taking a use position that allows the lock member 37, the lock member 37 of the protection member 23 can be moved in one direction A with respect to the protection member 23 and can be moved in the other direction B together with the protection member 23. The lock member 37 is provided with a locking portion 41 that engages with and disengages from the locking portion 44a of the protection member 23.
The lock position P for preventing the movement of the handle 1 and the lock release position Q for permitting the movement thereof are provided, and the lock member 37 is engaged with and disengaged from the lock portion 43 of the handle 1. Is provided so that the lock position P for preventing the movement of the protection member 23 in the other direction B and the lock release position Q for allowing the movement thereof can be taken.

According to the invention described in claim 3, the circular blade 7 is supported on the handle 1 and the protection member 23 is moved in two directions A and B with respect to the circular blade 7 as shown in the drawing of the second embodiment described later. A non-use position in which the cutting edge facing portion 24a formed on the protection member 23 corresponding to the cutting edge 7b on the outer circumference of the circular cutting edge 7 prevents the exposure of the cutting edge 7b of the circular cutting edge 7 and the cutting edge of the cutting edge 7b. In a circular blade type cutter capable of taking an allowable position that allows the lock member 51 to be movably supported by the protection member 23, the lock member 51 is engaged with and disengaged from the locking portion 54 of the handle 1. The lock position P for preventing the movement of the protection member 23 in the two directions A and B by providing the locking portion 53
And a lock release position Q that allows the movement thereof.

As shown in the drawings of the respective embodiments to be described later, the invention described in claim 4 is the invention described in claim 1, claim 2 or claim 3, in which the protection member 23 can always be in the unused position. As described above, the springs 27 and 29 are urged.

(Operation) In the invention described in claim 1, claim 2 or claim 3, when the lock members 37 and 51 are set to the unlocked position Q, the protection member 23 becomes movable so as to take the use position, and the circular shape is obtained. The blade edge 7b of the blade 7 is exposed from the blade edge facing portion 24a of the protection member 23 and can cut an object to be cut. On the other hand, when the lock members 37 and 51 are in the locked position P, the protection member 23 becomes immovable and always maintains the unused position, and even if an external force is applied to the protection member 23, the protection member 23 does not move, and the circular shape is formed. The blade edge 7b of the blade 7 is the protective member 2
It will not be exposed from the blade edge facing portion 24a of No. 3.

In the device described in claim 4, in addition to the operation of the device described in claim 1, claim 2, or claim 3, the protection member 23 is always in the non-use position due to the biasing force of the springs 27 and 29.

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. The present embodiment is an improvement of the invention disclosed in Japanese Utility Model Laid-Open No. 61-12489 previously filed by the present applicant.

The handle 1 is composed of a grip portion 2 and a blade mounting portion 3 formed on the front end portion thereof. Support portions 4, 5 are formed on both side surfaces of the blade mounting portion 3, and the support portions 4, 5 are formed. A support hole 6 is formed so as to penetrate through. A circular blade 7 is superposed on one of the support portions 4, a set screw 8 is non-rotatably inserted into the support hole 6 through a center hole 7a of the circular blade 7, and the other support portion 5 is provided with respect to the set screw 8. Tightening nut 9
Are screwed together. In this state, the circular blade 7 is pressed against the support member 4 by the set screw 8 and is rotatable with a constant frictional resistance.

An insertion hole 10 having an opening 10a corresponding to a part of the periphery of the central hole 7a of the circular blade 7 on the rear side of the central hole 7a is formed in the supporting portion 4 of the blade mounting portion 3 of the other supporting portion 5. The pressing member 11 is provided in the insertion hole 10 so as to extend rearward and has an opening 10a.
It is movably inserted so that the circular blade 7 can be pressed against it. A base plate portion 15 of the operating member 14 is slidably superposed on the other side surface of the blade mounting portion 3 opposite to the circular blade 7, and a fitting hole 16 formed in the base plate portion 15 has a fitting hole 16 formed therein. And a guide protrusion 17 protruding from the rear end of the base plate 15 is movably engaged with a guide groove 18 at the rear end of the blade mounting portion 3. ing. An operation piece portion 19 protruding rearward from a rear portion of the base plate portion 15 is slidably superposed on the outer surface of the handle 2, and a finger hook portion 20 is protruded on the outer side thereof. The pressing member 11 and the base plate portion 15 of the operating member 14 are engaged with each other by the slanted engagement surfaces 12 and 21 formed on them, and the locking convex portion 13 formed on the engagement surface 12 of the pressing member 11. Is engaged with a locking recess 22 formed in the engaging surface 21 of the operating member 14.

Then, when the operation member 14 is rotationally slid, the pressing member 11 is lifted via the oblique engagement surfaces 12 and 21, and protrudes from the opening 10a of the insertion hole 10 toward the circular blade 7. Due to this protrusion, the circular blade 7 is pressed by the pressing member 11, and frictional resistance according to the pressing force is applied to enable rotation. The protruding position of the pressing member 11 is defined by the locking projection 13 of the pressing member 11 and the locking recess 22 of the operating member 14.
Held by engagement with. The pressure contact force is adjusted by changing the engaging positions of the engaging surfaces 12 and 21 in accordance with the rotation angle of the operating member 14, restricting the movement of the pressing member 11 and changing the protrusion amount thereof.

The protection member 12 is composed of a disc portion 24 and a base portion 25 projecting from the rear side of the disc portion 24.
4a, and a movement permitting hole 26 is formed at the center of the disc portion 24. In addition, the base 25 of the protection member 23
Leaf spring portions 27 are provided on both upper and lower sides of the base member so as to project forward, and leaf springs 29 are attached to a step portion 28 formed at the rear end of the inner surface side of the base portion 25. Further, guide protrusions 30 are formed on the inner surface side of the base portion 25 of the protection member 23 in front of the leaf spring 29, and protrusions 31 are formed on both sides of the guide protrusions 30 so as to extend in the front-rear direction. . The protection member 23 is mounted between the inner side surface of the circular blade 7 and one side surface of the blade mounting portion 3 of the handle 1 when the circular blade 7 is crimped onto the support portion 4 of the blade mounting portion 3. In its installed state,
The support portion 4 is loosely fitted in the movement permitting hole 26 of the disc portion 24, and a space is formed between the inner peripheral surface of the movement permitting hole 26 and the outer peripheral surface of the support portion 4 to permit movement of the protective member 23. At the same time, the base portion 25 of the protection member 23 is fitted in the notch recess 32 formed at the front end of the grip portion 2 of the handle 1. In this state, the guide protrusion 30 of the base portion 25 of the protection member 23 is inserted into the elongated hole 33 formed in the cutout recess 32 so as to extend in the front-rear direction, and the leaf spring portions 27 of the base portion 25 are inserted. The leaf spring 29 at the rear end of the base portion 25 is pressed against both side walls 32a of the cut recess 32, and is pressed against the step portion 32b at the rear end of the cut recess 32.

Then, the protection member 23 moves in the vertical direction B of the handle 1 in the vertical direction B of the handle 1 within the range of the movement permitting hole 26 around the guide protrusion 30.
It becomes possible to rotate against the biasing force of 7, and the long hole 3
Within the range of 3, the handle 1 can move in the front-back direction A against the biasing force of the leaf spring 29. In the unused state, the support portion 4 of the blade mounting portion 3 is located at the center of the movement permitting hole 26 of the disc portion 24 due to the elastic balance of the leaf spring portions 27, and is moved forward by the biasing force of the leaf spring 29. However, the exposure of the cutting edge 7b of the circular blade 7 is blocked by the cutting edge facing portion 24a of the disc portion 24. In the base portion 25 of the protection member 23, the cover 34 is fitted into the cutout recess 32, and the locking leg 34a thereof is cut into the cutout recess 3.
It is adapted to be covered by being locked in the second locking hole 35.

Next, the protective member locking device will be described in detail.

A guide groove 36 is formed in the base portion 25 of the protection member 23 so as to extend in the front-rear direction A, and a lock member 37 is fitted in the guide groove 36 so as to be movable in the front-rear direction A. A leaf spring portion 38 is formed on the rear half of the lock member 37, and a knob 39 is formed on the leaf spring portion 38. Locking portions 40, 4 are provided on the front end portion of the lock member 37, on the lower side in the front-rear direction center portion, and on both sides of the knob 39, respectively.
1, 42 are formed.

On the rear side of the support portion 4 of the blade mounting portion 3, a notch portion 43 that is open to the rear in succession to the insertion hole 10 is formed, and the first locking portion formed at the front end portion of the lock member 37. 40 can be engaged with and disengaged from the notch portion 43 (locking portion).

A locking groove 44 is formed on the bottom surface of the front of the guide groove 36 of the protection member 23 so as to extend in the front-rear direction A, and the second locking portion 41 formed on the lock member 37 has the locking groove 44.
The lock member 37 is engaged with the lock member 37 and moves in the front-rear direction A as the lock member 37 moves in the front-rear direction, and the front and rear ends 44a, 44b of the locking groove 44 are inserted.
It is possible to contact the (locking part).

A guide hole 45 is formed in the cover 34 so as to extend in the front-rear direction A, and a pair of front and rear locking recesses 46 and 47 are formed in front portions of both side edges of the guide hole 45. The knob 39 of the lock member 37 is exposed to the outside of the cover 34 through the guide hole 45, and is movable in the front-rear direction A as the lock member 37 moves back and forth. This knob 3
The third locking portions 42 formed on both sides of the locking member 9 are engaged with either one of the pair of front and rear locking recesses 46, 47.

When using the circular blade rotary cutter configured as described above, as shown in FIG. 1, the knob 39 of the lock member 37 is retracted while being pressed against the biasing force of the leaf spring portion 38. The both locking portions 42 are engaged with the both locking recesses 47 on the rear side of the guide hole 45, and the lock member 37 is set to the unlocked position Q. In this unlocked state, as shown in FIGS. 2 and 3, the first locking portion 40 of the lock member 37 is disengaged from the inside of the notch portion 43 (locking portion), and the lock member 37 is locked. The second locking portion 41 is the locking groove 4
4 from the front end 44a (locking portion). Therefore, the protection member 23 can move in two directions A and B against the urging force of the leaf spring portion 27 and the leaf spring 29. At this time, both locking portions 42 of the knob 39 move in both locking recesses 47 on the rear side of the guide hole 45.

Then, first, the pressure contact force of the pressing member 11 against the circular blade 7 is adjusted according to the type of the cutting object as described above, and then the circular blade 7 is laid on the cutting object with an appropriate inclination angle. It is used by moving it along the cutting direction while pressing it against the object to be cut. The protection member 23 freely moves along one side surface of the circular blade 7 according to the inclination angle of the handle 1 with respect to the object to be cut, and the blade tip facing portion 24a slides on the object to be cut and the circular blade 7 The cutting edge 7b of the blade is not limited in its exposure direction and is freely exposed in any direction from the cutting edge facing portion 24a to bite into the object to be cut.
Rolls while causing a slight slip with the object to be cut.
On the other hand, when the circular blade 7 is separated from the object to be cut, the protection member 23 is automatically returned from the use position to the non-use position by the biasing force of the leaf spring portion 27 and the leaf spring 29.

When the circular blade rotary cutter is not used, as shown in FIG. 4, the knob 39 of the lock member 37 is moved forward so that both locking portions 42 of the locking member 37 are locked on both sides of the guide hole 45.
The lock member 37 to the lock position P. In this locked state, as shown in FIG. 5 and FIG. 6, the first locking portion 40 of the lock member 37 has the notch 4
The second locking portion 41 of the lock member 37 abuts on the front end 44a of the locking groove 44 while being engaged in the inside of the locking member 37. Therefore, the movement of the protective member 23 in the two directions A and B is prevented, and the blade edge facing portion 24a of the protective member 23 can always maintain the unused state in which the blade edge 7b of the circular blade 7 is not exposed.

Second Embodiment In the first embodiment described above, the lock member 37 is movable in the front-rear direction A, which is the urging direction of the leaf spring 29, with respect to the protection member 23, and the leaf spring portion 27 is moved. The lock member 3 is movable in the up-down direction B, which is the urging direction, together with the protective member 23. However, if the lock member 37 can prevent the protective member 23 from moving, the lock member 3 can be used.
The relative movement relationship between 7, the handle 1 and the protection member 23 is not limited to that in the first embodiment.

For example, the protection member locking device in the circular blade type cutter may be changed as shown in FIGS. 7 to 13. Hereinafter, the second embodiment will be described in detail focusing on the differences from the first embodiment.

A fitting recess 48 is formed in the base portion 25 of the protection member 23, a support groove 49 is formed in the center of the inner bottom surface of the fitting recess 48 in the front-rear direction, and a front end portion of the inner bottom surface is formed. The insertion hole 50 is transparently provided. A lock member 51 is fitted in the fitting recess 48, and the lock member 51 is
The support convex portion 52 formed in the central portion in the front-rear direction is fitted into the support groove 49 of the fitting concave portion 48, and the lock member 51 is rotatably supported around the support groove 49 and the support convex portion 52. ing. A locking portion 53 is provided at the front end of the lock member 51 so as to project, and the locking portion 53 is fitted into the fitting recess 48.
Is inserted into the insertion hole 50 of the. Base 2 of protective member 23
A lock hole 54 communicating with the insertion hole 50 is formed in the handle 1 adjacent to the front end of the elongated hole 33 of the handle 1 into which the guide protrusion 30 of FIG. The locking portion 53 of the lock member 51 is provided with the lock hole 54 as the lock member 51 rotates.
Can be engaged and disengaged. In the state where the locking portion 53 is engaged with the lock hole 54, the 12th and 13th
As shown in the figure, the engaging surfaces 53a, 5 on the outer periphery of the engaging portion 53
3b is capable of abutting on the locking surfaces 54a, 50b on the inner circumference of the lock hole 54.

An operation member 56 is supported in a guide hole 55 formed in the cover 34 so as to be movable in the front-rear direction.
A cam projection 57 is formed on the inner side of 6. A cam surface 58 is formed on the lock member 51.
The cam projection 57 of the operation member 56 is in contact with the reference numeral 8.

When using the circular blade rotary cutter configured as described above, the operating member 56 is retracted to the unlocked position Q as shown in FIG. In this unlocked state, as shown in FIG. 8 and FIG.
Since the cam projection 57 of 6 presses the rear side of the cam surface 58 of the lock member 51 with respect to the rotation center of the lock member 51, the locking portion 53 on the front side of the lock member 51 disengages from the lock hole 54 and locks. The member 51 is in the unlocked position Q.
Therefore, the protection member 27 can move in the two directions A and B against the urging force of the leaf spring portion 23 and the leaf spring 29.

When the circular blade rotary cutter is not used, the operation member 56 is advanced to the lock position as shown in FIG. In this locked state, as shown in FIGS. 11 and 12, the cam projection 57 of the operation member 56 pushes the cam surface 58 of the lock member 51 on the front side of the rotation center of the lock member 51, so that the lock is performed. The locking portion 53 on the front side of the member 51 is engaged with the lock hole 54. Therefore, the movement of the protective member 23 in the two directions A and B is prevented by the contact between the locking surfaces 53a and 53b of the locking portion 53 and the locking surfaces 54a and 54b of the lock hole 54, as shown in FIG. , Protection member 23
The blade edge facing portion 24a can always keep the unused state in which the blade edge 7b of the circular blade 7 is not exposed.

Effect of the Invention According to the present invention described in claim 1, claim 2 or claim 3, even if an external force is applied to the protection member 23 when not in use, the protection member 23 is protected by the action of the lock members 37 and 51. It is possible to prevent the movement of the protective member 23 at all times by preventing the movement, and the blade edge 7b of the circular blade 7 is not inadvertently exposed from the blade edge facing portion 24a of the protective member 23, so that the safety is improved.

According to the invention described in claim 4, claim 1 and claim 2
Alternatively, in addition to the effect of the invention described in claim 3, the spring 27,
By the function of 29, the lock member 37 moves to the unlocked position Q.
Since the protection member 23 can be automatically set to the non-use position regardless of whether it is in the lock position P or in the lock position P, the safety is further improved and it is convenient in use.

[Brief description of drawings]

1 to 6 show a first embodiment of the present invention, FIG. 1 is a partial front view showing an unlocked state of a circular blade rotary cutter according to this embodiment, and FIG. Partial front view showing a state in which the circular blade and the cover are removed from the circular blade rotary cutter shown in FIG. 3, FIG. 3 is a sectional view taken along line X1-X1 of FIG. 1, and FIG.
The figure is a partial front view showing a locked state of the circular blade rotary cutter according to the present embodiment, and FIG. 5 is a partial front view showing a state in which the circular blade and the cover are removed from the circular blade rotary cutter shown in FIG. FIG. 6 is a sectional view taken along line X2-X2 in FIG.
FIG. 13 to FIG. 13 show a second embodiment of the present invention, FIG. 7 is a partial front view showing the unlocked state of the circular blade rotary cutter according to this embodiment, and FIG. 8 is a circle shown in FIG. A partial front view showing a state in which a circular blade and a cover are removed from a blade rotary cutter, FIG. 9 is a sectional view taken along line Y1-Y1 of FIG. 7, and FIG.
The figure is a partial front view showing the locked state of the circular blade rotary cutter according to this embodiment, and FIG. 11 is a partial front view showing the state in which the circular blade and the cover are removed from the rotary blade rotary cutter shown in FIG. FIG. 12 is a sectional view taken along line Y2-Y2 of FIG. 10, and FIG. 13 is a partial sectional view showing a state in which the locking portion of the lock member is engaged with the lock hole. 1 ... Handle, 3 ... Blade mounting portion, 7 ... Circular blade, 7b ... Blade tip, 8 ...
Set screw, 11 ... Pressing member, 23 ... Protecting member, 24a ...
Blade edge facing part, 27 ... Leaf spring part (spring), 29 ... Leaf spring,
34 ... Cover, 36 ... Guide groove, 37 ... Lock member, 3
8 ... Leaf spring part, 39 ... Knob, 40 ... First locking part, 41
... second locking part, 42 ... third locking part, 43 ... notch part (locking part), 44 ... locking groove, 44a ... front end (locking part), 4
5 ... Guide hole, 46, 47 ... Locking recess, 48 ... Fitting recess, 49 ... Support groove, 50 ... Insertion hole, 51 ... Lock member,
52 ... Support convex portion, 53 ... Locking portion, 53a, 53b ... Locking surface, 54 ... Lock hole (locking portion), 54a, 54b ... Locking surface, 55 ... Guide hole, 56 ... Operating member, 57 ... Cam projection, 58 ... Cam surface, A, B ... direction, P ... Lock position, Q
… Unlocked position.

Claims (4)

[Scope of utility model registration request] 1. A circular blade (7) is supported on a handle (1), and a protective member (23) is attached to the circular blade (7) in at least one direction (A,
B) movably supported, the cutting edge facing part (24a) formed in the protection member (23) corresponding to the cutting edge (7b) on the outer circumference of the circular blade (7),
An unused position that blocks the exposure of the cutting edge (7b) of the circular blade (7),
In a circular blade type cutter adapted to take a use position that allows the blade edge (7b) to be exposed, a lock member (37, 51) is provided on the handle (1) and a handle (1) and a protection member (23).
The lock member (37, 51) is movably supported with respect to the lock portion (43, 44a, 54) of the handle (1) and / or the protective member (23). Part (40, 41, 53) is provided so that a lock position (P) for preventing the movement of the protection member (23) and a lock release position (Q) for allowing the movement can be taken. Protective member locking device for circular blade type cutters. 2. A circular blade (7) is supported on the handle (1), and a protective member (23) is supported on the circular blade (7) so as to be movable in two directions (A) and (B). The cutting edge facing part (24a) formed on the protection member (23) corresponding to the cutting edge (7b) on the outer circumference of the circular blade (7) is a circular blade.
In a circular blade type cutter that can take a non-use position that blocks the exposure of the blade edge (7b) of (7) and a use position that allows the exposure of the blade edge (7b), the protection member (23) The lock member (37) is supported so as to be movable in one direction (A) with respect to the protective member (23) and movable in the other direction (B) together with the protective member (23), and the lock member (37) is protected. The locking portion (41) for engaging and disengaging the locking portion (44a) of the member (23) is provided to prevent the lock position (P) from moving in one direction (A) of the protection member (23) and its movement. Allow the lock release position (Q) to be allowed and also use this lock member (3
7) A lock position (P) that locks the locking part (43) of the handle (1) to prevent the protection member (23) from moving in the other direction (B) by providing a locking part (40) that disengages from the locking part (43) of the handle (1). And a lock releasing position (Q) that allows the movement thereof, a protective member locking device for a circular blade type cutter. 3. A circular blade (7) is supported on the handle (1), and a protective member (23) is supported on the circular blade (7) so as to be movable in two directions (A) and (B). The cutting edge facing part (24a) formed on the protection member (23) corresponding to the cutting edge (7b) on the outer circumference of the circular blade (7) is a circular blade.
In a circular blade type cutter that can be set to a non-use position that blocks the exposure of the cutting edge (7b) of (7) and a use position that allows the exposure of the cutting edge (7b), lock the protection member (23). The member (51) is movably supported,
The locking member (51) is provided with a locking portion (53) that engages and disengages with the locking portion (54) of the handle (1), and is provided in two directions (A) and (B) of the protection member (23).
A protection member locking device for a circular blade type cutter, characterized in that a lock member (P) for preventing the movement of the blade and a lock release position (Q) for allowing the movement thereof can be provided. 4. The protection member (23) according to claim 1, 2 or 3, characterized in that the protection member (23) is biased by springs (27, 29) so that it can always assume an unused position. Protective member locking device for circular blade type cutters.