JPS6325055Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a ratchet type cutting tool used for cutting metal wires and the like.

(Prior art) A large number of notches are formed on the trailing edge of the movable blade,
Cutting tools have been known that use a feed claw attached to one handle to press this notch and gradually rotate the movable blade when the handle is opened or closed. Since the retaining pawl that prevents this from happening is always urged by a spring to engage with the notch, the notch and the pawl are likely to wear out, and when opening the movable blade, the pawl must be released by finger operation. However, there were problems such as the danger of handling.

(Purpose of the invention) The present invention has been completed with the aim of solving these conventional problems and providing a ratchet type cutting tool that is less likely to cause wear on the notch and pawl and is easy to handle.

(Structure of the device) This device has a fixed blade facing upward at the tip of the lower part of the hollow head of the upper handle, a large number of notches at the rear end, and a downward facing tooth on the inner surface that engages with the fixed blade. A movable blade is mounted facing the fixed blade via a washer, and a retaining pawl that can be engaged with the notch is normally pivoted in a detached state from the notch by a spring in the center of the head, and further A feed pawl is pivotally attached to the lower handle pivotally attached to the rear of the lower part of the head, and includes a projection that pushes up the notch when the lower handle is closed, and an elastic pin that engages the retaining pawl with the notch. It is characterized by this.

(Embodiment) Next, the present invention will be explained in detail using the illustrated bolt clipper as an embodiment. In the figure, 1 is an upper handle, and the lower end of the hollow head 2 has an upward fixed blade. 3 and a downwardly directed movable blade 5 having a number of notches 4 formed on its rear edge are mounted facing each other with a washer 8 interposed therebetween. Teeth 6 and 7 are formed on the inner surfaces of the fixed blade 3 and the movable blade 5, and the fixed blade 3 and the movable blade 5 are pivotally mounted on a washer 8 with the teeth 6 and 7 meshed with each other. , shallow semicircular recesses 9 and 10 are formed on the upper surfaces of the teeth 6 and 7, respectively, and the circular space formed by these recesses 9 and 10 on the back surface of the washer 8 is filled with the material to be cut. A disc-shaped stopper 11 is fitted to prevent the blade from biting into the base of the blade. Further, a retaining pawl 12 that can engage with the notch 4 of the movable blade 5 is pivotally attached to the center of the head 2 of the upper handle 1, and this retaining pawl 12 is normally separated from the notch 4 by a spring 13. be. Furthermore, a lower handle 14 is pivotally attached to the rear of the lower part of the head 2 of the upper handle 1 by a pin 15, and a feed pawl 17 is pivotally attached to the lower handle 14 at a position close to the pin 15 by a pin 16. . The feed pawl 17 has a projection 18 on its upper end that engages with the notch 4 of the movable blade 5 to push it up, and a stop pawl 12.
The elastic pin 19 is provided with an elastic pin 19 for pressing in a direction to engage the notch 4, and this elastic pin 19
Vertical hole 20 formed in feed claw 17 as shown in the figure
The spring 21 and the spring 21 are housed inside the spring 21. In addition,
Since this spring 21 presses the pawl 12 against the spring 13, the spring 21 is made stronger than the spring 13. The feed pawl 17 is always pressed toward the notch 4 by a spring 22 provided around the pin 16, but when the lower handle 14 is wide open as shown in FIG. hits the lower end of the feed claw 17, and the feed claw 17
is rotated clockwise. Further, since the central part of the movable blade 5 and the tip of the feed pawl 17 are connected by a link 25 with a long hole 24, the link 25 connects the movable blade 5 when the feed pawl 17 is rotated clockwise. It will open to the angle shown in Figure 2.

With this structure, when the upper handle 1 and the lower handle 14 are held with both hands and fully opened as shown in FIG. The material to be cut A is held between the cutting edge of the blade, and then the lower handle 14 is gradually closed toward the upper handle 1. As the lower handle 14 closes, the pin 23 separates from the lower end of the feed pawl 17, and the feed The pawl 17 is rotated counterclockwise by the spring 22 so that its protrusion 18 engages with the notch 4 located relatively above as shown in FIG. Thereafter, when the lower handle 14 is further closed, the protrusion 8 of the feed pawl 17 gradually pushes up the notch 4, and the movable blade 5 is rotated counterclockwise to begin cutting into the material to be cut. Thus, when the lower handle 14 is fully closed, the elastic pin 1 of the feed pawl 17
9 presses the pawl 12 and the pawl 12 is inserted into the notch 4.
to engage. Next, the lower handle 14 is opened, but when the lower handle 14 begins to open, the elastic pin 19 presses the pawl 12 toward the notch 4, and after the lower handle 14 has further descended, the movable blade 5 The stopper claw 12 is activated by the reaction force of cutting into the material to be cut A.
is strongly engaged with the notch 4, so even if the lower handle 14 is opened, the movable blade 5 remains at its original position, and the feed pawl 17
Only the protrusion 18 moves downward while sliding on the notch 4 and engages with the notch 4 further down. Then, if you close the lower handle 14 again, the feed claw 1
7 further pushes up the notch 4 and rotates the movable blade 5 to advance the cut into the material to be cut.
At the same time, the retaining pawl 12 comes off the notch 4 and becomes detached due to the force of the spring 13, but when the lower handle 14 is sufficiently closed, the elastic pin 19 of the feed pawl 17 presses the retaining pawl 12 again and the notch is closed. 4, the movable blade 5 stops at the final cutting position, and as the lower handle 14 is opened and closed, the movable blade 5 gradually cuts deeper into the material to be cut, until finally, as shown in FIG. Cutting is completed when the cutting edges of the movable blade 5 and the fixed blade 3 come into close contact with each other, and since this cutting is performed gradually as the lower handle 14 is opened and closed, it is possible to easily cut even hard wire materials. can. In addition, only the final stage of the notch 4 in the embodiment has a large pitch to prevent engagement of the pawl, so that the lower handle can be easily opened after cutting.

(Effects of the invention) As is clear from the above description, the present invention has a retaining pawl that can engage with the notch of the movable blade, which is normally separated from the notch by a spring, and a protrusion on the lower handle for pushing up the notch. Since the feed pawl is provided with an elastic pin that engages the pawl with the notch, the pawl only engages with the notch during the return process of the lower handle, unlike conventional methods in which the pawl always engages with the notch. The life of the tool is significantly longer because there is less wear compared to the other hand, and since the retaining pawl is biased to the notch release state by a spring, it can be removed by closing the lower handle and moving the movable blade slightly. The pawl can be easily removed from the notch, and there is no need to release the pawl by finger operation as in the past, and there is no danger associated with this. It has great practical value as it solves the problem of.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Figs. 2 and 3 are partially cutaway front views showing the same embodiment in a different manner, and Fig. 4 is a cross section taken along line A-A in Fig. 1. 5 is a cross-sectional view taken along the line BB in FIG. 1. 1: Upper handle, 3: Fixed blade, 4: Notch, 5:
Movable blade, 12: Stop claw, 13: Spring, 14: Lower handle, 17: Feed claw, 18: Projection, 19: Elastic pin.

Claims (1)

[Scope of utility model registration request] A fixed blade 3 is attached upward to the lower tip of the hollow head 2 of the upper handle 1, and a downward movable blade is provided with a large number of notches 4 at the rear end and teeth 7 on the inner surface that mesh with the fixed blade 3. 5 is mounted facing the fixed blade 3 via a washer 8, and a retaining pawl 1 that can be engaged with the notch 4 is provided in the center of the head 2.
2 is normally pivoted to the notch 4 in a detached state by a spring 13, and a lower handle 14 pivotally attached to the rear of the lower part of the head 2 pushes up the notch 4 when the lower handle 14 is closed. The protrusion 18 and the pawl 12
A cutting tool characterized in that a feed pawl 17 having an elastic pin 19 for engaging the notch 4 with the notch 4 is pivotally mounted.