JPS6226060Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field This invention is a circular blade rotary cutter in which a circular blade is rotatably supported on a handle, and the cutting edge can be prevented from being exposed on the outer periphery of the circular blade by a protective member when not in use. This relates to an exposure prevention structure.

Conventional technology Conventionally, this type of circular blade rotary cutter was
There is one described in Utility Model Publication No. 57-54780. In this cutter, a protective member that is separate from the handle and corresponds to the circular blade can take an unused position that prevents the cutting edge of the circular blade from being exposed, and a used position that allows the cutting edge to be exposed. The protective member is movably supported along one side of the circular blade, but the user must manually move the protective member between the non-use position and the use position. It was very troublesome.

Therefore, as shown in Japanese Utility Model Application No. 58-157549, a device was developed that includes an elastic body between the protective member and the handle, which urges the protective member to be held in the non-use position. In this circular blade rotary cutter, the protective member is movable only in either the front-rear direction or the up-down direction, so the exposed position of the circular blade tip is automatically determined, and the handle can be gripped during use. When cutting, it is necessary to perform the cutting operation while the inclination angle of the handle relative to the object to be cut is approximately constant. Therefore, there was a drawback that there was no diversity in the operating conditions and the operability was poor.

Purpose The purpose of the present invention is to elastically hold the protective member in an unused position, so that the protective member can be automatically returned to the unused position using elasticity, and It is an object of the present invention to provide a circular blade rotary cutter which can provide diversity in operating conditions and obtain good operability by widening the moving direction of members.

Composition of the invention In order to achieve this purpose, the invention includes a protective member that is separate from the handle and corresponds to the circular blade.
The circular blade is supported so as to be movable in the vertical direction and in the front-rear direction along one side of the circular blade so as to be able to take a non-use position that prevents the cutting edge of the circular blade from being exposed and a used position that allows the cutting edge to be exposed. Between the protective member and the handle, there are provided an elastic body that biases the protective member in the vertical direction so as to hold the protective member in the non-use position, and an elastic body that biases the protective member in the front-back direction.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.The handle 1 consists of a grip part 2 and a blade attachment part 3 formed at one end thereof. A supporting portion 4 consisting of an outer cylinder 5 and an inner cylinder 6 whose height is lower than that of the outer cylinder 5 is provided in a protruding manner. Insertion holes 6a and 8 are formed in the center of the inner cylinder 6 and the circular blade 7 of the support part 4, respectively, and when the circular blade 7 is overlapped with the end surface of the outer cylinder 5 of the support part 4, the set screw 9 is inserted into these insertion holes 6a, 8,
A tightening nut 10 is screwed onto the set screw 9 on the other side of the blade mounting portion 3. At this time, the circular blade 7 is crimped to the outer cylinder 5 of the support part 4 by the set screw 9, and the center part of the circular blade 7 is elastically curved into the outer cylinder 5 of the support part 4, so that the circular blade 7 is pressed into the outer cylinder 5 of the support part 4. 5, it is rotatable with a constant frictional resistance.

The protection member 11 consists of a disk portion 12 and a base portion 13 protruding from the rear side.
A movement permitting hole 14 is formed in the center of 2. Further, plate spring portions 15 as elastic bodies are provided on both upper and lower sides of the base 13 of the protection member 11 to protrude forward, and a stepped portion 16 formed at the rear end of the inner surface of the base 13 is provided with an elastic body. A leaf spring 17 is attached. Furthermore, the base 1 of the protection member 11
A guide protrusion 18 is formed on the inner surface side of the plate spring 17 in front of the leaf spring 17.
Projections 19 are formed on both sides of 8 to extend in the front-rear direction. The protective member 11 is attached between the inner surface of the circular blade 7 and one side of the blade attachment part 3 of the handle 1 when the circular blade 7 is crimped to the support part 4 of the blade attachment part 3. The support part 4 is loosely fitted into the movement allowance hole 14 of the plate part 12, and a space is formed between the inner peripheral surface of the movement allowance hole 14 and the outer peripheral surface of the support part 4 to allow movement of the protection member 11. At the same time, the base portion 13 of the protection member 11 is fitted into the notch recess 20 formed at the front end of the grip portion 2 of the handle 1 . In this state, the base 1 of the protection member 11 is connected to the elongated hole 21 formed in the notch recess 20 so as to extend in the front-rear direction.
The guide protrusion 18 of No. 3 is inserted and fitted, and both leaf spring portions 15 of the base 13 are inserted into both side walls 20a of the notch recess 20.
At the same time, the leaf spring 17 at the rear end of the base 13 is pressed against the stepped portion 20b at the rear end of the cut recess 20. The protection member 11 can be rotated about the guide protrusion 18 within the range of the movement allowance hole 14 in the vertical direction of the handle 1 against the biasing force of the leaf spring portion 15 . Within this range, the handle 1 is movable in the front-rear direction against the biasing force of the leaf spring 17. When not in use, as shown in FIG. The circular blade 7 is moved forward by the biasing force 17, and the cutting edge 7a of the circular blade 7 is prevented from being exposed by the cutting edge facing portion 12a of the disc portion 12.

When using the circular blade rotary cutter configured as described above, for example, as shown in FIG. It is used by moving it along the cutting direction while pressing it against the object P to be cut. At this time, the protection member 11 moves upward under the biasing force of the leaf spring portion 15, and its blade edge facing portion 12a
slides on the object to be cut P, and the cutting edge 7a of the circular blade 7 is exposed below the blade edge facing portion 12a and bites into the object to be cut P, and the circular blade 7 has a small gap between the object P and the object to be cut. Rolls while causing slippage. on the other hand,
When the circular blade 7 is separated from the object to be cut P, the protective member 11
is automatically returned from the use position shown in FIG. 5 to the non-use position shown in FIG. 4 by the biasing force of the leaf spring portion 15.

Further, the circular blade rotary cutter of this embodiment can also be used with the handle 1 standing at a large angle of inclination with respect to the object to be cut P, as shown in FIG. In this case, the protection member 11 moves backward against the biasing force of the leaf spring 17, and the circular blade 11 moves backward during use.
The cutting edge 7a is exposed to the front of the cutting edge facing portion 12a and bites into the object P.

In this way, the protection member 11 protects the object P of the handle 1 from being cut.
It freely moves up and down and in the front and rear directions along one side of the circular blade 7 according to the inclination angle with respect to the blade. Therefore, during use, the cutting edge 7a of the circular blade 7 is freely exposed in any direction from the cutting edge facing portion 12a without being limited in its exposure direction, and bites into the object P to be cut.
Therefore, when using the circular blade rotary cutter, the handle 1 can be used no matter how inclined it is with respect to the object to be cut P, making it very easy to operate.

In addition, by adjusting the pressing force of the circular blade 7 against the support part 4 of the handle 1 using the set screw 9 and the tightening nut 10, the frictional force between the circular blade 7 and the support part 4 can be changed, and the object to be cut can be The sliding of the circular blade 7 with respect to P can be made most appropriate.

The present invention is not limited to the above-mentioned embodiment, and the following configuration is also possible.

(a) A coil spring is used in place of the leaf spring 17 at the rear end of the base 13 of the protection member 11.

(b) The leaf spring 17 at the rear end of the base 13 of the protective member 11 is removed, and a similar leaf spring is inserted into the notched recess 20 of the handle 1.
Attach to.

(c) Upper and lower leaf spring portions 1 of the base 13 of the protective member 11
5 is eliminated, and similar leaf spring parts are formed on both upper and lower sides of the notched recess 20 of the handle 1, and are brought into pressure contact with protrusions formed on both upper and lower sides of the base 13 of the protection member 11.

Effects According to the present invention detailed above, the protective member 1
Since the protective member 11 is biased by the elastic bodies 15 and 17 so as to be held in a non-use position that prevents exposure of the cutting edge 7a of the circular blade 7, the return of the protective member 11 to the non-use position is performed using elasticity. can be done automatically,
This has the effect of making the operation much easier. In addition, since the protective member 11 is provided with an elastic body 15 that biases the protection member 11 in the vertical direction and an elastic body 17 that biases the protection member 11 in the front-rear direction, the protection member 11 can freely move in the vertical and front-rear directions to form a circular shape. The cutting edge 7a of the blade 7 is freely exposed in any direction, and the handle 1 can be used no matter how inclined it is with respect to the object to be cut P, which also provides the effect of obtaining good operability.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
FIG. 2 is a perspective view showing the inner surface of the protective member, FIG. 3 is an assembled perspective view, FIG. 4 is a front view showing an unused state, and FIGS. 5 and 6 are front views showing a used state. . Handle 1, gripping part 2, blade attachment part 3, support part 4, circular blade 7, cutting edge 7a, protection member 11, disc part 12, cutting edge facing part 12a, movement allowance hole 14, leaf spring part (elastic body) 15 , a leaf spring (elastic body) 17, a guide protrusion 18, a long hole 21, and an object to be cut P.

Claims (1)

[Claims for Utility Model Registration] 1. In a circular blade rotary cutter in which a circular blade 7 is rotatably supported on a handle 1, a protective member 11 that is separate from the handle 1 and corresponds to the circular blade 7; in the vertical direction and in the front-rear direction along one side of the circular blade 7 so that it can take a non-use position that prevents the cutting edge 7a of the circular blade 7 from being exposed and a used position that allows the cutting edge 7a to be exposed. An elastic body 15 is movably supported, and between the protection member 11 and the handle 1 is an elastic body 15 that biases the protection member 11 in the vertical direction so as to hold it in the non-use position, and an elastic body that biases the protection member 11 in the front-rear direction. 17. A blade edge exposure prevention structure in a circular blade rotary cutter, characterized by comprising: 2. Scope of Utility Model Registration Claims: The circular blade 7 is crimped onto a support portion 4 protruding from the handle 1, and the protective member 11 is movably supported between the inner surface of the circular blade 7 and the handle 1. A structure for preventing exposure of the cutting edge of the circular blade rotary cutter according to item 1. 3. A movement allowance hole 14 into which the support part 4 of the handle 1 is loosely fitted is formed in the protection member 11.
The cutting edge of the circular blade rotary cutter according to claim 2, which has a space between the inner peripheral surface of the support part 4 and the outer peripheral surface of the support part 4 to allow movement of the protection member 11. Exposure prevention structure. 4 Elastic body 1 that biases the protection member 11 in the vertical direction
Reference numeral 5 denotes leaf spring parts formed on both upper and lower sides of the base 13 of the protection member 11, which are pressed against both upper and lower sides of the handle 1.
A structure for preventing exposure of the cutting edge of the circular blade rotary cutter described in 2. 5 Elastic body 1 that biases the protection member 11 in the front-back direction
7 is a leaf spring interposed between the base 13 of the protection member 11 and the handle 1. The structure for preventing exposure of the cutting edge of the circular blade rotary cutter according to claim 2, which is a registered utility model.