JP2021130171A - Steel sheet straight cutting guide - Google Patents

Abstract

To provide a steel sheet straight cutting guide that can be readily fitted in cutting a steel sheet and safely cut a steel sheet linearly.SOLUTION: A steel sheet straight cutting guide 10 includes: a rod-like frame 20; a cutting part 30 including a saw blade for cutting a steel sheet linearly along a longitudinal direction while being fitted to the frame 20; an adsorbing part 40 for fixing the frame 20 by coming into contact with one principal surface of the steel sheet; and a backward movement prevention part 60 capable of moving the cutting part 30 only in a cutting direction of the cutting part 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a steel sheet linear cutting guide used when cutting a steel sheet in a straight line (straight) by a cutting means such as a tip saw (electric circular saw).

There is a tipped saw that cuts a material by rotating a circular saw blade. Conventionally, when an operator grips a tip saw and cuts it in a straight line, it is cut using a ruler, a guide plate, or the like.
As an example, the guide device disclosed in Patent Document 1 includes a base plate placed on a work piece, a slider movable along a guiding means provided on the base plate, and a fixture for fixing the base plate to the work piece. The electric circular saw is moved in a straight line to cut a work piece such as wood.

However, the fixture disclosed in Patent Document 1 is composed of a locking piece that presses the base plate downward and a clamper that presses the back surface of the workpiece, in other words, the clamper enters the back surface of the workpiece. It is fixed so as to sandwich the work piece. Therefore, in a case where the back surface of the workpiece cannot be inserted, for example, when the back surface of the workpiece cannot be contacted and only the front surface is contacted, the base plate cannot be fixed and cannot be cut.
In addition, the conventional guide plate has a configuration in which the end face is applied to the end face of the work piece and cut in a straight line, and cannot be applied when the end face is not straight or a portion away from the end face is cut in a straight line.

Japanese Unexamined Patent Publication No. 2014-136352

The problem to be solved by the present invention is to provide a steel sheet linear cutting guide that can be easily attached when cutting a steel sheet and can be safely and linearly cut in view of the above-mentioned problems of the prior art. There is.

The present invention provides a frame as a first means for solving the above problems.
A cutting portion that is attached to the frame and has a saw blade that cuts a steel plate in a straight line along the longitudinal direction.
A suction portion that contacts one of the main surfaces of the steel plate to fix the frame,
A retrograde prevention unit that can move the cutting portion only in the cutting direction of the cutting portion,
It is an object of the present invention to provide a straight line cutting guide for a steel sheet, which is characterized by the above.
According to the first means, it can be attached to an arbitrary position of a large steel plate having a width of several meters, and the cut portion does not move in the direction opposite to the cutting direction during straight cutting along the longitudinal direction of the frame. Work can be done safely.

According to the present invention, as a second means for solving the above-mentioned problems, in the first means, a rail provided between the frame and the cut portion along the longitudinal direction of the frame and the cut portion side are provided. It is an object of the present invention to provide a straight steel sheet cutting guide, which comprises a sliding portion having a ball caster which is attached to and slides on the rail.
According to the second means, the cut portion can be smoothly moved linearly along the longitudinal direction of the frame.

According to the present invention, as a third means for solving the above problems, in the first or second means, the retrograde prevention portion is attached to a rack provided along the longitudinal direction of the frame and the cutting portion. A pinion gear that meshes with the rack, a ratchet gear that coaxially attaches the pinion gear and a rotating shaft and rotates integrally with the pinion gear, and the ratchet gear that rotates in either forward or reverse rotation. It is an object of the present invention to provide a straight steel plate cutting guide characterized by consisting of a ratchet claw.
According to the third means, it is possible to prevent the cut portion from moving in the direction opposite to the cutting direction along the longitudinal direction of the frame, and the work can be performed safely.

The present invention is characterized in that, as a fourth means for solving the above-mentioned problems, in the third means, the retrograde prevention portion includes a retrograde release portion for releasing the ratchet claw away from the ratchet gear. It is an object of the present invention to provide a straight line cutting guide for a steel sheet.
According to the fourth means, the cut portion can be moved in the direction opposite to the cutting direction.

According to the present invention, an arbitrary portion of a large steel plate having a width of several meters or more, for example, can be cut linearly and safely with a hand-held tipped saw. At that time, since the tip saw does not move in the direction opposite to the cutting direction during straight cutting, for example, when the operator accidentally releases his hand when cutting a vertical surface such as a wall from below to above. However, the tip saw does not fall and the work can proceed safely. In addition, it is possible to prevent kickback (bounce) that generally occurs when the tip saw is returned in the opposite direction while the saw blade is rotated.

It is a perspective view of the steel plate straight line cutting guide of this invention. It is a partially disassembled perspective view of the steel plate straight line cutting guide of this invention. It is explanatory drawing of the cutting method of the steel plate straight line cutting guide of this invention.

An embodiment of the straight steel sheet cutting guide of the present invention will be described in detail below with reference to the drawings.

[Sheet Steel Straight Cutting Guide 10]
FIG. 1 is a perspective view of a straight steel sheet cutting guide of the present invention. FIG. 2 is a partially exploded perspective view of the straight steel sheet cutting guide of the present invention. As shown in the figure, the steel plate linear cutting guide 10 of the present invention has a rod-shaped frame 20, a cutting portion 30 attached to the frame 20 and having a saw blade for cutting the steel plate along the longitudinal direction, and one of the steel plates. A suction portion 40 that comes into contact with the main surface to fix the frame 20 and a retrograde prevention portion 60 that can move the cutting portion 30 only in the cutting direction of the cutting portion 30 are provided.
The frame 20 is a square member having a rectangular cross section and a rod shape using a material having a predetermined length (1 to several meters as an example) and a predetermined strength (metal such as aluminum, fiber reinforced plastic, non-magnetic material such as carbon fiber reinforced plastic). Alternatively, it is a long straight member and serves as a guide when cutting.
The cutting portion 30 uses a hand-held tipped saw that can be used at a site where gas cutting cannot be used for reasons such as fire prevention. In addition to this, the cutting portion 30 can also be applied to an end mill or the like.

The suction portion 40 is a ring-shaped magnet (for example, a neodymium magnet) attached (embedded) to both ends of the frame 20. The suction portion 40 has a central hole 42 that has been threaded and a bolt 44 that is screwed into the central hole 42. When the suction portion 40 having such a configuration is installed on the steel plate, the frame 20 is positioned with respect to the cut portion of the steel plate with the tip of the bolt 44 slightly protruding from the center hole 42 on the back surface. After that, the bolt 44 can be loosened in the removing direction to attract the magnet to the steel plate and fix it. On the other hand, when removing from the steel plate, the magnet is tightened in the direction of penetrating the bolt 44 of the center hole 42, and the tip of the bolt 44 protrudes from the center hole 42 on the back surface, so that the magnet separates from the steel plate and the magnetic force weakens and is removed (adsorption). Can be released). As described above, a steel plate with a magnet can be fixed at an arbitrary position even if it is not near the end face.

The sliding portion 50 has a pair of plate members 51 and 52 attached so as to sandwich the side surface of the frame 20, and the plate members 51 and 52 are fixed to each other by long bolts 53. A plurality of ball casters 54 are attached to the surface (inner surface) of the pair of plate members 51 and 52 facing the frame 20. As an example, two ball casters 54 shown in FIG. 2 are attached at the top and one at the bottom. Two upper and lower rails 56 are attached to the side surface of the frame 20 facing the ball caster 54. The rail 56 is formed in a concave shape into which the ball caster 54 fits, and extends along the longitudinal direction of the frame 20. One plate member 51 is fixed to the cut portion 30. A retrograde prevention portion 60, which will be described later, is attached to the other plate member 52. With such a configuration of the sliding portion 50, the cut portion 30 can be smoothly moved back and forth in a straight line along the longitudinal direction of the frame 20.

The retrograde prevention unit 60 employs a rack and pinion mechanism and a ratchet mechanism. In a more specific configuration, the rack 62 is attached to one surface (upper surface) of the frame 20 along the longitudinal direction. A pinion gear 65 that meshes with the rack 62 is rotatably attached between the base 63 and the cover 64 provided in a direction orthogonal to the main surface of the other plate member 52. A ratchet gear 66 is attached to the upper surface of the pinion gear 65. The ratchet gear 66 has a smaller diameter than the pinion gear 65, the axis of the rotating shaft 66a pivotally supported between the base 63 and the cover 64 is mounted coaxially with the pinion gear 65, and the ratchet gear 66 is integrally rotated by the parallel key 69. It is configured to be possible. The ratchet gear 66 has a ratchet claw 67 that meshes with the gear. The ratchet claw 67 is urged (pressed) by a spring 68 in a direction in which it meshes with the ratchet gear 66. Both the ratchet claw 67 and the spring 68 are attached to the cover 64 with stepped screws 67a and 68a for rotation fulcrums. With such a configuration of the retrograde prevention portion 60, the pinion gear 65 can move on the rack 62 only in the direction in which the ratchet gear 66 rotates. Therefore, the cutting direction of the cutting portion 30 is only one direction, and retrogression can be prevented.

The retrograde prevention portion 60 is provided with a retrograde release portion 70 capable of moving the cutting portion 30 in both directions (advancing / retreating directions). The retrograde release portion 70 arc-shaped the cover 64 in accordance with the trajectory of the pin 71 extending upward on the upper surface of the tip of the ratchet claw 67 and the pin 71 moving with the position away from the position where the ratchet claw 67 meshes. It has a long hole 72 that has been cut, and a pin 71 protrudes from the long hole 72. With such a configuration of the retrograde release portion 70, when the retrograde prevention portion 60 is released, the pin 71 plays the role of a release lever, and the pin 71 is moved by a force equal to or greater than the pressing force of the spring 68 to form a ratchet claw 67. The meshing of the ratchet gear 66 is temporarily released, and the sliding portion 50 and the cutting portion 30 can be freely moved in both directions (advancing / retreating directions). Unless the retrograde release portion 70 releases the cut portion 30 in this way, the cut portion 30 cannot be returned in the direction opposite to the cutting direction.

[Sheet steel cutting method]
FIG. 3 is an explanatory view of a cutting method of the straight steel sheet cutting guide of the present invention.
When the steel plate linear cutting guide 10 is installed on the steel plate, the frame 20 is positioned with respect to the cut portion of the steel plate with the tip of the bolt 44 slightly protruding from the center hole 42 on the back surface of the suction portion 40. After that, the bolt 44 is loosened in the removing direction to attract the magnet to the steel plate and fix it. Next, as shown in (1), one end of the frame 20 which is the cutting start side by releasing the ratchet claw 67 by the pin 71 of the retrograde release portion 70 of the cutting portion 30 attached to the frame 20 via the sliding portion 50. Move to.

As shown in (2), the steel plate is cut while moving the cutting portion 30 in the cutting direction along the longitudinal direction of the frame 20. Since the reverse running prevention portion 60 does not move the cutting portion 30 in the direction opposite to the cutting direction during cutting, the operator mistakenly cuts a vertical surface such as a wall from below to above. Even when the hand is released, the cutting portion 30 does not fall and the work can proceed safely. In addition, it is possible to prevent kickback (bounce) that occurs when the tip saw is returned in the opposite direction while the saw blade is rotated.

As shown in (3), when the cutting portion 30 moves to the other end of the frame 20 on the cutting end side, it stops. After that, in order for the operator to carry the steel plate linear cutting guide 10 in a well-balanced manner, the ratchet claw 67 is released by the pin 71 of the retrograde release portion 70, and the cut portion 30 is moved to the vicinity of the center of the frame 20. When the straight steel plate cutting guide 10 is removed from the steel plate, the magnet is separated from the steel plate by tightening in the direction of penetrating the bolt 44 of the center hole 42 and projecting the tip of the bolt 44 from the center hole 42 on the back surface. Can be weakened and removed (suction is released). Further, when continuing the linear cutting, the frame 20 is moved to the cutting destination, fixed again by the suction portion 40, and then the operations after (1) are repeated.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.
Further, the present invention is not limited to the combinations shown in the embodiments, and can be implemented by various combinations.

10 Steel plate straight cutting guide 20 Frame 30 Cutting part 40 Suction part 42 Center hole 44 Bolt 50 Sliding part 51 One plate material 52 The other plate material 53 Long bolt 54 Ball caster 56 Rail 60 Retrograde prevention part 62 Rack 63 Base 64 Cover 65 Pinion gear 66 Ratchet gear 66a Rotating shaft 67 Ratchet claw 67a Stepped screw 68 Spring 68a Stepped screw 70 Reverse release part 71 Pin 72 Long hole

Claims (4)

With the frame
A cutting portion that is attached to the frame and has a saw blade that cuts a steel plate in a straight line along the longitudinal direction.
A suction portion that contacts one of the main surfaces of the steel plate to fix the frame,
A retrograde prevention unit that can move the cutting portion only in the cutting direction of the cutting portion,
A straight steel sheet cutting guide characterized by being equipped with. The steel sheet straight line cutting guide according to claim 1.
Between the frame and the cut portion, a rail provided along the longitudinal direction of the frame and a sliding portion having a ball caster attached to the cut portion side and fitted to the rail to slide are provided. A straight steel sheet cutting guide that is characterized by this. The steel sheet straight line cutting guide according to claim 1 or 2.
The retrograde prevention portion includes a rack provided along the longitudinal direction of the frame, a pinion gear attached to the cutting portion and meshed with the rack, and the pinion gear and a rotating shaft coaxially attached to the pinion gear. A straight steel plate cutting guide comprising a ratchet gear that rotates in a positive manner and a ratchet claw that rotates the ratchet gear in either forward or reverse rotation direction. The steel sheet straight line cutting guide according to claim 3.
The steel plate linear cutting guide, wherein the retrograde prevention portion includes a retrograde release portion for releasing the ratchet claw by separating it from the ratchet gear.

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