JP3634448B2 - Cutting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a manual cutting tool used for cutting resin pipes, resin moldings, and the like.
[0002]
[Prior art]
As a manual cutting tool for resin pipes, etc., a receiving part for an object to be cut is integrally provided at the tip of the handle body, and a movable cutting blade and a cutting blade of the cutting blade are mounted on the head of the handle body. There is known a cutting tool provided with a handle provided with a feed claw meshing with a rear ratchet.
[0003]
This type of cutting tool first opens the handle wide enough to fully open the movable cutting blade, and then repeatedly opens and closes the handle. The teeth are fed one by one, and the movable cutting blade is gradually closed for cutting. This type of cutting tool is disclosed in, for example, Japanese Utility Model Publication No. 57-1053, Japanese Utility Model Publication No. 59-20876, Japanese Utility Model Application Publication No. 54-90777, Japanese Utility Model Application Publication No. 3-80770.
[0004]
When the handle is returned from the open position, this feed claw passes over the ratchet crest and engages with the next crest, but at that moment the engagement with the ratchet is released, so that the cutting blade moves in the opening direction. There is a risk of returning. Therefore, the head of the handle body is provided with a return prevention claw and is always engaged with the ratchet by a spring force to prevent the cutting blade from returning.
[0005]
For this reason, it is necessary to provide a spring on the return-preventing claw and always engage the ratchet. In addition, the feed pawl needs a spring that urges it in the direction of the ratchet, and when the handle is wide open and the engagement between the return prevention pawl and the feed pawl and the ratchet is released, the movable cutting blade is maximized. A spring is required to open it to the position. Therefore, the conventional cutting tool of this type always incorporates three springs, which causes an increase in manufacturing cost and increases the number of assembly steps.
[0006]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described conventional problems and to provide a cutting tool capable of reducing the number of assembly steps and the manufacturing cost by reducing the number of springs.
[0007]
[Means for Solving the Problems]
The cutting tool of the present invention, which has been made to solve the above-mentioned problems, is provided integrally with a receiving part for the object to be cut at the tip of the handle body, and at the head of the handle body, a movable cutting blade, In a cutting tool provided with a feed claw that meshes with the ratchet on the rear surface of the cutting blade, and a return prevention claw, a spring that urges the movable side cutting blade to open and a return prevention claw are always provided. The spring that is in close contact with the ratchet is the same member .
[0008]
[Action]
In the cutting tool of the present invention, the spring that urges the movable cutting blade in the opening direction and the spring that always keeps the return prevention pawl in close contact with the ratchet are the same member. The number of springs can be reduced without loss. As a result, it is possible to reduce assembly man-hours and reduce manufacturing costs.
[0009]
【Example】
In the following, the present invention will be described in more detail by way of illustrated embodiments.
In FIG. 1, reference numeral 1 denotes a handle main body, 2 denotes a head thereof, and 3 denotes a receiving part for a workpiece integrally provided at the tip of the head 2. Since the cutting tool of this embodiment is for cutting a resin molding, a concave step for receiving a plurality of resin moldings is provided in the receiving portion 3.
[0010]
A movable cutting blade 5 is pivotally attached to a head 2 of the handle body 1 by a shaft 4 so as to be freely opened and closed. The rear surface of the cutting blade 5 has an arc shape centered on the shaft 4, and a ratchet 6 having a large number of teeth is formed. A handle 7 is pivotally attached to the head 2 of the handle body 1 so as to be openable and closable around a shaft 8. A feed claw 10 is pivotally attached by a shaft 9 at a position slightly rearward of the shaft 8 of the handle 7. The feed claw 10 is repelled in the direction of the ratchet 6 by a spring 11 provided around the shaft 9, but the feed claw 10 and the ratchet 6 are separated from each other in FIG. ing.
[0011]
A return prevention claw 12 is pivotally attached to the shaft 8 pivotally attached to the handle 7. As will be described later, the return preventing claw 12 is always engaged with the ratchet 6 so that the movable cutting blade 5 does not return to the open side even when the feed claw 10 is detached from the ratchet 6 during the cutting operation. It is what. However, since the handle 7 is wide open in the state of FIG. 1, the other end 13 of the return prevention claw 12 is pushed by the tip of the handle 7, and the return prevention claw 12 is also separated from the ratchet 6.
[0012]
Reference numeral 14 denotes a spring in which one arm of the hook-shaped spring is bent in a dogleg shape, and one end of the spring is passed through the bent long hole 15 of the movable cutting blade 5. The central portion of the spring 14 is wound around the pin 16 of the handle body 1 and the other end is engaged with the rear surface of the return preventing claw 12. As a result, the spring force of the spring 14 urges the movable cutting blade 5 in the direction of opening, and at the same time urges the return prevention pawl 12 in the direction of always contacting the ratchet 6.
[0013]
Next, the movement of this cutting tool will be described.
First, when the handle 7 is greatly opened as shown in FIG. 1, the feed claw 10 and the return prevention claw 12 are separated from the ratchet 6, and the movable cutting blade 5 is opened as shown in FIG. Therefore, a resin molding or the like to be cut is placed on the receiving part 3 for the object to be cut.
[0014]
When the handle 7 is closed from this state as shown in FIG. 2, the feed claw 10 is engaged with the teeth of the upper end portion of the ratchet 6 of the movable cutting blade 5, and the cutting blade 5 is counterclockwise on the drawing by one tooth. Rotate in the direction and start cutting. Next, when the handle 7 is opened as shown in FIG. 3, the feed claw 10 moves over the teeth of the ratchet 6 and moves to the second tooth, but the return prevention claw 12 is engaged with the ratchet 6 by the force of the spring 14. Therefore, the cutting blade 5 is prevented from returning in the opening direction by the force of the spring 14 at the moment when the feed claw 10 gets over the teeth of the ratchet 6.
[0015]
Further, as shown in FIGS. 4 to 6, by repeatedly opening and closing the handle 7, the feed claw 10 gradually closes the movable cutting blade 5, and between the receiving portion 3 and the movable cutting blade 5. Complete cutting of resin molding. Thereafter, when the handle 7 is greatly opened again as shown in FIG. 1, the movable cutting blade 5 is opened by the force of the spring 14 and returns to the initial state.
[0016]
【The invention's effect】
As described above, the cutting tool according to the present invention is similar to this type of conventional cutting tool in that the feed pawl gradually closes the movable cutting blade to perform cutting by repeatedly opening and closing the handle. . In addition, in the present invention, since the spring that urges the movable cutting blade in the opening direction and the spring that always attaches the return prevention pawl to the ratchet are the same member , the number of springs can be reduced. There is an advantage that the number of assembling steps can be reduced and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a state in which a cutting blade is opened.
FIG. 2 is a cross-sectional view showing a state in which a handle is closed from the state shown in FIG.
3 is a cross-sectional view showing a state in which a handle is opened from the state shown in FIG. 2;
4 is a cross-sectional view showing a state in which a handle is closed from the state shown in FIG. 3;
FIG. 5 is a cross-sectional view in a state where opening and closing of the handle is repeated.
FIG. 6 is a cross-sectional view when cutting is completed.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Handle body 2 Handle body head 3 Object receiving part 4 Axis 5 Cutting blade 6 on the movable side Ratchet 7 Handle 8 Axis 9
10 Feeding claw
11 Spring
12 Anti-return claw
13 The other end of the return prevention claw
14 Spring
15 Long hole
16 pin

Claims (1)

A handle receiving part is integrally provided at the front end of the handle body, and a handle having a movable cutting blade and a feed claw that meshes with a ratchet on the rear surface of the cutting blade at the head of the handle body, and a return A cutting tool provided with a prevention claw, wherein the spring that urges the movable side cutting blade to open and the spring that always attaches the return prevention claw to the ratchet are made of the same member. tool.

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