JPH0525829Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a replaceable blade type cutter such as a saw, a knife, a sickle, etc., in which the blade can be easily replaced against the handle.

(Prior art) When the blade of a saw, knife, sickle, etc. is damaged, or when you want to replace it with another blade, it is necessary to replace the blade. As shown in FIG. 2, the replacement blade 3 is prevented from falling downward by the surface friction force between the blade holder 2 fixed to the handle 1 and the side edge of the blade (replacement blade) 3.

(Problem to be solved by the invention) However, when trying to prevent the replacement blade from falling downward using the surface friction force between the blade holder and the side edge of the replacement blade, it is difficult to prevent the replacement blade from falling downward due to the weak surface friction force. There was a risk that the replacement blade would fall off the blade holder during use.

The present invention aims to eliminate such drawbacks.

(Means for Solving the Problems) The present invention consists of a handle and a blade having a blade holder, and has a width that allows the blade holder to sandwich the rear end of the blade and the back part connected to the rear end. This is a replaceable blade type cutter having a clamping groove, in which a cam protrusion having a top end curved inward is formed at the rear end of the blade, and a stopper having an engagement hole that engages with the cam protrusion is attached to the handle. A blade holder is provided to straddle the cavity provided in the blade, and the stopper is pressed in the longitudinal direction of the blade by the biasing force of the stopper itself or by a spring.

(Function) When using the replaceable blade type cutter of the present invention, a surface friction force acts between the blade holder fixed to the handle and the side edge of the blade. In addition, after the cam protrusion at the rear end of the blade is engaged with the engagement hole formed in the stopper, the stopper is rotated by the spring pressing the stopper toward the front (that is, in the longitudinal direction of the blade) or by the biasing force of the stopper itself. The blade moves to fill the gap that existed between the upper surface of the cam projection and the upper wall of the engagement hole, and the upper surface of the cam projection and the upper wall of the engagement hole come into contact to prevent the blade from falling off downward.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Reference numeral 1 denotes a handle, and a notch in the longitudinal direction is formed at the tip thereof, and the rear end of a blade holder 2 of a blade 3 of a saw or the like is inserted into the notch and fixed to the handle 1 with a pin 4 and a support shaft 5. ing. The blade holder 2 has a clamping groove 6 that clamps the rear end of the blade 3 and the back part connected to the rear end. The holding groove 6 is open downward and has a groove bottom 7 formed on the upper side. The shape of the groove bottom 7 is such that the edge of the back of the blade 3 is aligned with and held in the groove bottom 7. The central portion 8 of the clamping groove 6 lacks the groove bottom 7 in order to allow the blade 3 to rotate freely around the support shaft 5. At the rear end of the blade 3, a substantially U-shaped cut groove 9, which is open downward and through which the support shaft 5 is inserted, is formed in a direction substantially perpendicular to the side edge of the blade 3. Reference numeral 10 denotes a stopper having an engagement hole 14 formed by a leaf spring with an urging force, and is fixed to the blade holder 2 at a position close to the rear end of the blade 3. As shown in FIG. 3, it is also possible to have the stopper itself pressed in the front direction by the spring 11 without having any biasing force. Provide a hole 12 on handle 1, and stopper 1
It is fixed to the blade holder 2 in a state where it straddles the blade holder 2 inside the blade holder 12. A cam protrusion 13 is formed at the rear end of the blade 3, the upper surface of which is curved inward. The cam projection 13 and the engagement hole 10c are adapted to engage with each other.

Since the present invention is constructed as described above, in order to remove the blade 3 from the handle 1, push the operating part 10a of the stopper 10 diagonally backward with your finger, and the biasing force of the stopper 10 or the stopper 10 will be moved forward. As shown in FIGS. 3 and 4, the stopper 10 rotates against the biasing force of the pushing spring 11, and a gap is created between the upper wall 10b of the engagement hole and the upper surface 13a of the tip of the cam projection 13. With the blade 3 rotated at an appropriate angle, remove the blade 3 from the spindle 5 along the direction in which the cut groove 9 is formed, and then remove the blade 3 from the shaft 5.
Just take it outside. To attach the blade 3 to the handle 1, hold the blade 3 at an appropriate angle with respect to the handle 1 so that the support shaft 5 is inserted along the direction in which the cutting groove 9 is formed. Install from the direction,
The cam protrusion 13 formed at the base end of the blade 3 rotates around the support shaft 5 and pushes the stopper 10 backward against the biasing force of the stopper 10 or the biasing force of a spring 11 that pushes the stopper 10 forward. The cam projection 13 engages with the engagement hole 10c of the stopper 10. In order for the cam protrusion 13 and the engagement hole 10c to engage with each other by rotation, the engagement hole 10c must be formed to be larger than the cam protrusion 13 inserted into the engagement hole 10c and to leave a slight gap. However, in the present invention, since the stopper 10 is always pressed against the front surface, that is, in the longitudinal direction of the blade 3, the upper wall 10b of the engagement hole 10c of the stopper 10 engages along the curve provided at the tip of the cam projection 13. Since the blade 3 moves until the upper wall 10b of the matching hole and the upper surface 13a of the cam projection come into contact with each other, the blade 3 does not wobble. The force that prevents downward rotation of the blade 3 is applied not only to the surface friction force between the blade holder 2 and the blade 3 as in the conventional case, but also to the fixed portion of the stopper 10, so that the rotation prevention force is strong. Further, upward rotation of the blade 3 is prevented by engagement between the cut groove 9 and the support shaft 5.

(Effects of the present invention) According to the present invention, the blade is prevented from falling downward by not only the surface friction force between the blade holder and the side edge of the blade, but also by the rear end of the blade whose top surface is curved inward. The blade is also prevented from falling off by engaging the cam protrusion formed in the blade with the engagement hole formed in the stopper, which is pressed in the longitudinal direction by the biasing force, and locking the blade in the back. The blade will not fall downward during use. . Further, there is no gap between the upper wall of the engagement hole and the upper surface of the cam projection, and no looseness occurs during use.

[Brief explanation of drawings]

Fig. 1 is a side view of a conventional replaceable blade type cutter, Fig. 2 is a side view of the present invention, Figs. 3 to 4 are enlarged explanatory views of main parts, and Fig. 5 is a cross section taken along line A-A of Fig. 2. Enlarged view, No. 6
The figure is an enlarged cross-sectional view taken along line B-B. In the figure, 1 is a handle, 2 is a blade holder, 3 is a blade, 5 is a spindle, 6 is a clamping groove, 10 is a stopper, and 13 is a cam projection.

Claims (1)

[Scope of utility model registration request] A replaceable blade type cutlery consisting of a handle and a blade having a blade holder, the blade holder having a gripping groove wide enough to grip the rear end of the blade and the back connected to the rear end, The front part of the clamping groove is provided with a groove bottom that the upper part of the blade comes into contact with, the central part of the clamping groove is missing the groove bottom, and the lower part near the base of the blade is provided with a cut groove that opens downward. A support shaft is provided at a position to be inserted through the blade holder and the cut groove, a cam projection whose tip top surface is curved inward is provided at the rear end of the blade, and an engagement hole that engages with the cam projection is provided. A stopper is provided in a hole provided in the handle at a position where the upper surface of the tip of the base of the blade abuts the upper wall of the engagement hole of the stopper, straddling the blade holder and fixed to the blade holder. A replaceable blade type cutter, characterized in that the stopper is pressed in the longitudinal direction of the blade by the urging force of the stopper itself or by a spring.