JP6446678B2 - Angle cutter - Google Patents

Description

  The present invention relates to an angle cutter that rotates an operation handle to lower an upper blade to cut an angle (L-shaped steel).

  Conventionally, an angle cutter as shown in Patent Document 1 has been used as a tool for cutting an angle which is an L-shaped section steel. This angle cutter has a structure that lowers an upper blade by rotating an operation handle pivotally attached to a main body having a lower blade to cut an angle placed on the lower blade.

  As shown in FIG. 1, a shaft 1 that pivots the operation handle to the main body is an eccentric shaft, and a circular eccentric portion 2 is provided. The eccentric portion 2 is fitted in the circular hole 4 of the slider 3. The slider 3 has a quadrangular shape and is fitted into a horizontally long rectangular hole 6 in the upper blade 5. For this reason, when the operating handle is rotated, the eccentric portion 2 moves downward along an arcuate locus, and the slider 3 lowers the upper blade 5 via the horizontal contact surface 7.

  In this case, if the rotation angle of the operating handle is θ, the eccentricity is A, and the descending amount of the upper blade 5 is x, then x = Asin θ. Accordingly, the lowering amount x of the upper blade 5 with respect to the rotation angle θ of the operating handle gradually decreases, and the cutting force increases accordingly. That is, the lever ratio gradually increases as the operation handle is lowered. However, it is not necessary to increase the lever ratio because it is easy to apply force when the position of the operation handle is lowered. On the contrary, there is a problem that the handle is at a high position at a cutting start position where a large cutting force is required, and it is difficult to apply a force.

  In addition, the angle cutter of Patent Document 1 has an overlap margin between the upper blade and the lower blade so that the angle is surely cut off, but the lever ratio, that is, the cutting force is maximum after the upper blade and the lower blade overlap. There was a waste of becoming.

Japanese Patent No. 4202846

  Accordingly, an object of the present invention is to provide an angle cutter that solves the above-mentioned conventional problems, has excellent handle operability, and can easily cut an angle.

The present invention, which has been made to solve the above problems, includes a main body having a lower blade, an upper blade supported by the main body so as to be movable up and down, a base handle for fixing the main body to a floor surface, and a horizontal shaft. An angle cutter that cuts an angle placed on the lower blade by lowering the upper blade by rotating the operation handle downward from the raised position. Has an eccentric shaft at the eccentric position, and the upper blade is formed with a through-hole in which this eccentric shaft is inscribed, and an inclined surface is formed in the lower part of the inner surface of this through-hole that is pushed down by the eccentric shaft during cutting However, it has a fast-forward function.

  The eccentric shaft can be provided with a collar on its outer periphery. By providing the collar, wear of the eccentric shaft can be suppressed.

  In the angle cutter of the present invention, an inclined surface is formed on the lower portion of the inner surface of the through hole that is pushed down by the eccentric shaft during cutting. The amount will increase and fast forward will occur. At this time, if the operation handle is in a low position where it is easy to put weight on, there is no problem in cutting.

  On the other hand, the handle is at a high position at the start of cutting, but rapid feed is not performed at that position, and the amount of eccentricity of the eccentric shaft can be reduced by the provision of the fast-forward portion, so the force required for handle operation Is reduced, and the operability of the handle is improved. This point will be described again together with the embodiment.

It is explanatory drawing of the principal part of a prior art. It is a front view which shows embodiment of this invention. It is a rear view which shows embodiment of this invention. It is a front view of the state which opened the operation handle. It is a front view of a main body. It is a front view of an upper blade. It is a side view of an eccentric shaft. It is a rear view which shows an operation state.

Preferred embodiments of the present invention are shown below.
2 to 4 are general views showing an embodiment of the present invention, wherein 10 is a main body, 11 is a base handle fixed to the lower part of the main body, and 12 is an operation pivotally attached to a horizontal shaft 13 at the upper part of the main body 10. It is a handle. As illustrated, the angle cutter of the present invention is used with the base handle 11 placed on the floor surface.

  As shown in FIG. 5, the body 10 is formed with a punch hole 14, and an L-shaped hole 15 for inserting an angle to be cut as shown in FIG. The provided stay 16 is fixed with bolts. A lower blade 17 having a shape along the shape of the L-shaped hole 15 is fixed to the lower side of the punched hole 14. The stay 16 is located away from the lower blade 17 in the longitudinal direction of the angle, and supports the inserted angle so as not to be inclined. For this reason, when the angle to be cut is inserted into the L-shaped hole 15 of the stay 16 and the inside of the punched hole 14 of the main body 10, the angle is placed on the lower blade 17 and the stay 16. The L-shaped hole 15 is formed with the corner portion on the upper side.

  The main body 10 includes vertical guides 18 and 18 on both sides, and an upper blade 19 shown in FIG. 6 is supported between the guides 18 and 18 so as to be movable up and down. The upper blade 19 includes a cutting blade 20 at a lower end portion and a through hole 21 at an upper portion. The shape of the through hole 21 will be described later.

  As shown in FIG. 7, the horizontal shaft 13 that pivots the operation handle 12 on the main body 10 includes an eccentric shaft 22 at an eccentric position, and also includes a hole 23 for inserting the base of the operation handle 12. For this reason, when the operation handle 12 is rotated, the horizontal shaft 13 rotates around the central axis, but the eccentric shaft 22 moves eccentrically. In this embodiment, a ring-shaped collar 24 is fitted on the outer periphery of the eccentric shaft 22 as shown in FIG. The collar 24 is inscribed in the through hole 21 of the upper blade 19 described above. Therefore, when the operation handle 12 is rotated downward, the horizontal shaft 13 rotates, and the collar 24 of the eccentric shaft 22 pushes down the upper blade 19 while moving eccentrically around the horizontal shaft 13 and rests on the lower blade 17. Cut the angle in the closed state. The collar 24 may be omitted and the diameter of the eccentric shaft 22 may be increased.

  As shown in FIG. 6, the through hole 21 of the upper blade 19 includes a horizontal surface 30 at the lower portion and an inclined surface 31 at an adjacent portion thereof. The horizontal plane 30 is a portion where the outer surface of the collar 24 comes into contact with the start of cutting, and the inclined surface 31 following this is a portion where the outer surface of the collar 24 comes into contact thereafter. As will be described later, the upper blade 19 is pushed down while the collar 24 is in contact with these portions, and the cutting proceeds. In this embodiment, the angle with respect to the horizontal surface 30 is 140 degrees, and the inclined surface 31 and the horizontal surface 30 are chamfered in an arc shape and smoothly connected. The right side of the inclined surface 31 is a circular arc surface 32, but an upper inclined surface 33 is also formed at the top. Reference numeral 34 denotes an arc surface between the upper inclined surface 33 and the horizontal surface 30. The through hole 21 needs to have a shape that does not hinder the eccentric movement of the collar 24, and the center points of the arc surface 32 and the arc surface 34 are shifted laterally in accordance with the amount of eccentricity of the eccentric shaft 22.

  Next, the operation of the angle cutter of the present invention will be described with reference to FIG.

  In FIG. 8, A is a state in which the operation handle 12 is opened to the maximum. At this time, the collar 24 contacts the upper inclined surface 33 of the through hole 21 of the upper blade 19 to lift the upper blade 19. In this state, the angle is set on the lower blade 17. In FIG. 8, the direction of the operation handle and the eccentric direction of the collar 24 are shown by broken lines. The eccentric direction of the collar 24 and the direction of the contact point between the through hole 21 are shifted.

  C is a cutting start state in which the upper blade 19 is in contact with the angle. In this embodiment, the angle of the operation handle 12 with respect to the base handle 11, that is, the angle from the horizontal floor surface is 78 degrees. If this cutting start angle is less than 80 degrees, the cutting operation becomes easy. In the state C, the outer peripheral surface of the collar 24 is in contact with the lower horizontal surface 30.

  When the operation handle 12 is rotated downward from the state C, the state D is obtained. Between C and D, the contact point moves to the right while the outer peripheral surface of the collar 24 is in contact with the lower horizontal surface 30. During this time, since the contact surface with the collar 24 is horizontal, the upper blade 19 is pushed down according to the sine curve as in the conventional case, and the angle cutting proceeds.

  In the state D, the outer peripheral surface of the collar 24 leaves the horizontal plane 30 and starts to contact the inclined surface 31. While the outer peripheral surface of the collar 24 moves on the inclined surface 31, the upper blade is fast-forwarded to complete the angle cutting. The angle of the operation handle 12 from the horizontal floor at this time is 16 degrees. In this state E, the gap between the upper blade 19 and the lower blade 17 is zero, but it is necessary to provide a certain amount of overlap so that the angle is completely cut in consideration of processing play and tolerances. is there. In the present invention, the overlap from E to F when the operation handle 12 is lowered to the lowest side corresponds to this overlap allowance. This EF portion is also fast forwarded. At this time, since the operation handle 12 is at a low position where it is easy to put on the weight, it can be easily cut.

  Thus, in this embodiment, by forming the inclined surface 31 on the inner surface of the through hole 21 of the upper blade 19, the lowering speed of the upper blade 19 with respect to the rotation angle of the operation handle 12 between DF is increased, and the fast-forward function Was held. When the lowering amount of the upper blade 19 is constant, in the present invention, the feed speed between A and D (the lowering speed of the upper blade 19 with respect to the rotation angle of the operation handle 12) is equivalent to the rapid feed between DF in this way. Can be set small. This means that the amount of eccentricity of the eccentric shaft 22 can be made smaller than in the prior art, and less force is required to rotate the operation handle 12 than in the conventional cam mechanism. Therefore, the angle cutter of the present invention can easily operate the operation handle 12 at a high position at the start of cutting.

  After the cutting, the operation handle 12 is rotated in the reverse direction to raise the upper blade 19. However, when returning from the state B to the state A, the outer peripheral surface of the collar 24 is in contact with the upper inclined surface 33. The upper blade 19 can be lifted earlier than before. Therefore, the upper inclined surface 33 functions as an inclined surface for quick return formed in a portion lifted by the collar when the operation handle 12 is opened from the cutting start angle.

DESCRIPTION OF SYMBOLS 1 Axis 2 Eccentric part 3 Slider 4 Circular hole 5 Upper blade 6 Hole 7 Horizontal contact surface 10 Main body 11 Base handle 12 Operation handle 13 Horizontal shaft 14 Lole 15 L-shaped hole 16 Stay 17 Lower blade 18 Vertical guide 19 Upper Blade 20 Cutting blade 21 Through-hole 22 Eccentric shaft 23 Hole 24 Collar 30 Horizontal surface 31 Inclined surface 32 Arc surface 34 Arc surface

Claims (2)

A main body having a lower blade, an upper blade supported by the main body so as to be movable up and down, a base handle for fixing the main body to the floor, and an operation handle pivotally attached to the main body by a horizontal axis. An angle cutter that lowers the upper blade by rotating downward from the raised position and cuts the angle placed on the lower blade,
The horizontal shaft has an eccentric shaft at an eccentric position, and the upper blade is formed with a through-hole in which the eccentric shaft is inscribed, and the inner surface of the through-hole is inclined to a lower portion pushed down by the eccentric shaft at the time of cutting An angle cutter that features a surface and a fast-forward function.   The angle cutter according to claim 1, wherein the eccentric shaft has a collar on its outer periphery.

Images