JP6576900B2 - Cutting tool - Google Patents

Description

  The present invention relates to a handy-type cutting tool capable of easily and reliably cutting, for example, an inverted T-shaped section steel used as a ceiling base material.

  Conventionally, a ceiling of a concrete building is usually provided with metal fittings on bolts suspended from the ceiling slab or ceiling deck plate, and a ceiling base material is fixed to the metal fittings at a certain interval, and the ceiling base material is fixed. An inspection port that can be opened and closed on the ceiling panel itself by installing a series of ceiling materials such as a base board and finishing board on the material, and arranging a power wiring pipe and ventilation duct on the back of the ceiling material Or the work opening is established (refer patent document 1). And for the above-mentioned ceiling base material, a section steel having an inverted T-shaped cross section is used. Generally, when ceiling construction is performed, these ceiling base materials are preliminarily used with a high-speed cutter equipped with a rotating grindstone blade. They are cut into predetermined dimensions and later assembled on the ceiling side.

Japanese Patent Laid-Open No. 2003-7119

  However, in Patent Document 1, when cutting the ceiling base material using an electric high-speed cutting machine, it is necessary to prepare a power source, and the power cord is obstructive, the workability is poor, and the ceiling base material is not deformed. There was a problem that there was a fear of.

  Therefore, an object of the present invention is to provide a cutting tool that does not require a power source, improves workability, and prevents deformation of a profile.

The invention according to claim 1 is a holding part for positioning and accommodating a cross-section inverted T-shaped member comprising a vertical piece part and a horizontal piece part projecting left and right at the lower end of the vertical piece part, and the holding part A cutting blade that cuts the shape toward the holding portion, the holding portion includes a vertical piece groove portion that accommodates the vertical piece portion, and the width of the upper portion of the vertical piece groove portion is increased. engaging portion is formed, the cutting blade is formed in a mountain shape, and characterized in that the trajectory of the tip of the cutting blade is Figure on the opposite side of the engaging portion from the center of the groove for the longitudinal strip To do.

According to a second aspect of the present invention, the holding portion includes a horizontal piece holding portion that can be engaged with a protruding portion standing from the horizontal piece portion.

The invention of claim 3 is characterized by comprising positioning means for positioning the cutting blade in either a state in which the shape member can be accommodated in the holding portion or a state in which the shape member can be cut.

According to the first aspect of the present invention, a power source is not required, workability is improved, and the profile having an inverted T-shaped cross section is positioned, so that deformation of the profile during cutting can be prevented. Further, it is possible to prevent deformation of the vertical piece portion of the profile at the time of cutting. Furthermore, the shape can be cut smoothly while preventing the shape from being deformed during cutting.

According to invention of Claim 2 , a deformation | transformation of the horizontal piece part of a profile at the time of a cutting | disconnection can be prevented.

According to invention of Claim 3 , accommodation of a shape member and positioning of a shape member can be performed easily.

It is a perspective view which shows the use condition of the cutting tool in 1st Example of this invention. It is a perspective view of a cutting tool same as the above. It is a front view of a cutting tool same as the above. It is a rear view of a cutting tool same as the above. FIG. 4 is an AA sectional view of the cutting tool in FIG. FIG. 6 is a cross-sectional view of the cutting tool showing a state where the pin is removed from the large diameter portion in FIG. 5. It is a front view which shows the state which dropped the blade of the cutting tool same as the above. It is a front view which shows the working state of a cutting tool same as the above. It is a front view of the cutting tool which shows the state which raised the cutting blade to the uppermost part same as the above. It is a front view of the cutting tool which shows another embodiment of an operation part same as the above.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  FIGS. 1-10 shows Example 1 of this invention, First, the ceiling structure which concerns on this embodiment is demonstrated. As an example of the ceiling structure, there is provided a ceiling base material 5 that is gripped by a hanger member made of a metal fitting attached to a suspension bolt suspended from an upper floor slab and assembled into a square lattice pattern on the back of the ceiling. .

  Here, the ceiling base material 5 is arranged in a lattice shape, and the ceiling panel 7, an acoustic device, a lighting device, a fire extinguishing device, and the like are provided in a block (section) composed of the ceiling base material 5 assembled in the lattice shape. Equipment plates with various equipment are installed.

  The ceiling base material 5 is composed of a work piece obtained by bending a steel plate material, a T bar having an inverted T-shaped cross section made of aluminum, and a vertical piece portion 9 extending in the vertical direction. And a flange-shaped horizontal piece 10 extending in the horizontal direction from the lower part of the vertical piece 9.

  At the upper end of the vertical piece portion 9 is provided with a head 12 formed by connecting a pair of upper ridges 11, 11 extending in a bifurcated parallel manner upward, the head 12 being a hanger. The member 4 is formed so as to be graspable. Further, lower projecting ridges 13 and 13 are formed at both ends in the width direction (Y direction in the figure) of the horizontal piece portion 10, and reinforcing ribs for improving the strength of the ceiling base material 5. It plays the role of

  The ceiling panel 7 or the equipment plate is screwed or placed on the horizontal piece 10. In addition, the shape of the ceiling base material 5 is not limited to the said shape, The shape which does not have a protrusion may be sufficient.

  Next, the cutting tool 14 according to the present embodiment will be described. The cutting tool 14 includes a holding unit 15 that positions and holds the ceiling base material 5 that is a shape member, a cutting blade 16 that cuts the ceiling base material 5 held by the holding unit 15, and an operation that operates the cutting blade 16. Part 17.

  The holding portion 15 has a space member 20 disposed between the first outer plate member 18 and the second outer plate member 19, and the cutting blade 16 is interposed between the first outer plate member 18 and the second outer plate member 19. The guide groove 21 that can be moved forward and backward is formed, and is formed of a hollow body having an opening 22 that exposes the cutting blade 16 in the middle of the guide groove 21.

  The first outer plate material 18 includes an upper portion 24 in which a first holding groove portion 23 for holding the ceiling base material 5 is formed, and a first holding groove portion 23 formed continuously with the first holding groove portion 23 by notching one side surface. It has a substantially U-shaped configuration comprising an intermediate portion 26 having one opening 25 and a lower portion 28 having a first holding-side long hole 27 formed parallel to the vertical direction of the holding portion 15.

  The second outer plate material 19 includes a top 30 formed with a second holding groove 29 for holding the ceiling base material 5 and a second holding groove 29 formed by cutting out one side surface. It has a substantially U-shaped configuration comprising an intermediate portion 32 having two openings 31 and a lower portion 34 having a second holding-side long hole 33 formed parallel to the vertical direction of the holding portion 15.

  Note that the lower end of the upper portion 30 of the second outer plate material 19 protrudes longer than the lower end of the upper portion 24 of the first outer plate material 18.

  Furthermore, a notch 35 formed continuously from the boundary portion with the upper portion 30 of the other side surface of the intermediate portion 32 of the second outer plate material 19 downwardly at a predetermined interval is provided. . The vertical interval between the notches 35 is formed to be greater than the thickness of the ceiling panel 7.

  The space member 20 corresponds to the upper part 37 in which the concave part 36 for receiving the mountain-shaped upper part of the cutting blade 16 is formed, and the intermediate parts 26 and 32 of the first outer plate part 18 and the second outer plate part 19, respectively. Intermediate portion 38, one side surface portion 39 corresponding to one side surface side and the other side surface side of each of the lower portions 28, 34 of the first outer plate portion 18 and the second outer plate portion 19 and the other side. The steel plate includes a side surface portion 40, and includes a lower portion 41 that forms the guide groove 21 between the one side surface portion 39 and the other side surface portion 40.

  The first holding groove portion 23 is formed by cutting upward from the lower end of the upper portion 24 of the first outer plate material 18 and cut into a shape capable of holding the vertical piece portion 9 of the ceiling base material 5. It consists of the groove part 42 for the 1st vertical piece formed lacking.

  The second holding groove 29 is formed by cutting upward from the lower end of the upper portion 24 of the second outer plate material 19 and cut into a shape capable of holding the vertical piece 9 of the ceiling base material 5. It consists of a groove part 43 for the second vertical piece formed by lacking, and four groove parts 44 for the horizontal piece in a paired relationship on both sides of the second vertical piece groove part 43 of the second outer plate material 19. By forming the groove portions 44 for horizontal pieces at regular intervals and selecting them appropriately according to the width dimension of the horizontal piece portion 10 of the ceiling base material 5 to be cut, the ceiling base material 5 having a different shape is obtained. Can be held individually.

  The first vertical groove portion 42 has a rectangular shape in which the vertical dimension is the same as or larger than the height dimension of the vertical piece part 9 and the horizontal dimension is larger than the width dimension of the head 12 of the vertical piece part 9. It is a groove cut out.

  The second vertical groove 43 has a rectangular shape in which the vertical dimension is the same as or larger than the height of the vertical piece 9 and the horizontal dimension is larger than the width of the head 12 of the vertical piece 9. In the groove notched in, the opening side of the upper part of the groove is projected in parallel in the horizontal direction by a vertical dimension equal to or higher than the height of the upper protrusion 11 of the ceiling base material 5 from the upper end of the groove. The notch engaging portion 45 is formed by enlarging the dimension, and the entire second vertical piece groove portion 43 is formed in a key shape.

  The cutting blade 16 slides in the guide groove 21 and faces the first holding groove portion 23 and the second holding groove portion 29.

  This cutting blade 16 is formed of a steel plate, a sharp tip 46 is formed at substantially the center, and a single-edged blade formed in a mountain shape in which cutting surfaces 47 and 48 that are temporarily retracted to the left and right of the tip 46 are formed. It has become. The tapered surface 49 of the cutting blade 16 is directed to the first outer plate material 18.

  The cutting blade 16 is shifted from the center of the first vertical piece groove portion 42 and the second vertical piece groove portion 43 to the closed side of the upper portions 24 and 30 in the cutting edge 16.

  The left and right cutting surfaces 47 and 48 of the cutting blade 16 are set at different angles of inclination α and β intersecting with the movement line L indicating the moving direction of the tip 46 in the cutting blade 16.

  A blade-side long hole 51 is formed in the base end portion 50 of the cutting blade 16, and the base-end side of the blade-side long hole 51 has an arc shape having a diameter larger than the width of the blade-side long hole 51. A large diameter portion 52 is formed. The length direction of the blade side long hole 51 is formed in parallel with the movement line L of the cutting blade 16.

  Further, the first holding side long hole 27 and the second holding side long hole 33 in the base end portion 53 of the holding part 15 are formed to have a width substantially equal to or larger than the width of the blade side long hole 51. Yes. The length direction of the holding side long hole 54 is formed in parallel with the movement line L of the cutting blade 16.

  The operation part 17 includes a fixed handle 55 fixed to the closed side of the lower part of the holding part 15, and a movable handle 57 supported rotatably on the shaft 56 on the opening 22 side of the lower part of the holding part 15. Yes.

  A substantially L-shaped frame 58 protrudes around the shaft 56 of the movable handle 57, and an arc-shaped handle-side long hole 59 is formed in the frame 58.

  The handle side long hole 59 has a center point on the longitudinal center line M of the holding side long hole 54, and is on a circle indicated by an imaginary line N passing through the shaft 56 and the lowest point of the holding side long hole 54. In the shape of an arc formed from the lowest point to a point where the circle and a circle centered on the axis 56 intersect with a circle (imaginary line R) whose radius is slightly smaller than the distance from the axis 56 to the center line in the longitudinal direction. It is a groove formed.

  A pin 60 is inserted into the handle side long hole 59, the holding side long hole 54, and the blade side long hole 51.

  The pin 60 has a cylindrical shape that is slidable in the handle-side long hole 59 and the holding-side long hole 54 and has a diameter that can be engaged with the large-diameter portion 52.

  An engaging groove portion 61 that engages with the blade-side long hole 51 is formed in the peripheral wall at the intermediate portion of the pin 60.

  The first outer plate material 18 side of the pin 60 includes a pin-side large-diameter portion 62 having an outer diameter larger than the width of the holding-side long hole 54, and the second outer plate material 19 side of the pin 60 has a holding side. A hollow cylindrical cover member 63 having an outer diameter larger than the width of the long hole 54 and closed on one side is externally fitted.

  A coil spring 64 is accommodated in the gap between the cover member 63 and the pin 60 as an elastic member that biases the pin 60 toward the second outer plate member 19. A pinch portion 65 is attached to the pin-side large diameter portion 62.

  The effect of the cutting tool 14 having the above configuration will be described. A method for adjusting the position of the cutting blade 16 will be described. First, in order to make the cutting blade 16 fall, the movable handle 57 is opened and the engagement groove 61 of the pin 60 is engaged with the blade side long hole 51 as shown in FIG. When the cutting blade 16 is lowered until the pin 60 reaches the uppermost portion of the blade-side long hole 51, the cutting blade 16 is hidden under the holding portion 15, and the opening 22 is opened to the maximum. With this cutting blade 16 dropped, the ceiling base material 5 can be accommodated in the opening 22.

  Next, in order to set the working state for cutting the ceiling base material 5, when the pin 60 is engaged with the large diameter portion 51 of the blade side long hole 51 with the movable handle 57 opened, as shown in FIG. Even when the cutting blade 16 is lowered most, the vertical distance between the tip 46 of the cutting blade 16 and the lower end of the upper portion of the holding portion 15 becomes smaller than the height of the ceiling base material 5, and the ceiling base material 5 When the first holding groove portion 23 and the second holding groove portion 29 are positioned, the ceiling base material 5 is not detached from the opening 22.

  In the ceiling base material 5 positioned in the first holding groove portion 23 and the second holding groove portion 29, the vertical piece portion 9 is engaged in the first vertical piece groove portion 42 and the second vertical piece groove portion 43. The lower protrusion 13 of the horizontal piece 10 is engaged with the groove 44 for the horizontal piece. In addition, the ceiling panel abuts on the notch 35 and is positioned.

  A state in which the movable handle 57 is closed and the cutting blade 16 is lifted to cut the ceiling base material 5 from the working state of FIG. 8 will be described. First, the distal end portion 46 is stuck in the side piece 10 on the closing side. When the cutting blade 16 is further raised, each horizontal piece 10 is cut by the cutting surfaces 47 and 48, and the ceiling base material 5 is pushed up by the cutting surface 16 toward the opening 22 in the second vertical piece groove 43. Then, the head 12 is engaged with the engaging portion 45 and the vertical piece 9 is positioned in the second vertical piece groove 43. When the cutting blade 16 is further raised and the ceiling base material 5 is completely cut, the ceiling base material 5 on the tapered surface 49 side is detached.

  Since the handle-side long hole 59 of the frame 58 is formed in an arc shape, the contact area between the pin 60 and the handle-side long hole 59 increases, and the force from the movable handle 57 is efficiently transmitted to the cutting blade 16. The ceiling base material 5 can be effectively cut.

  As described above, in the present embodiment, the ceiling base material 5 is used as a reverse T-shaped cross section composed of the vertical piece portion 9 and the horizontal piece portions 10 and 10 projecting left and right at the lower end of the vertical piece portion 9. By providing the holding portion 15 that is positioned and accommodated and the cutting blade 16 that moves toward the holding portion 15 to cut the ceiling base material 5, the cutting tool 14 does not require a power source and the workability is improved, and the cross section is reversed. Since the T-shaped ceiling base material 5 is positioned, deformation of the ceiling base material 5 at the time of cutting can be prevented.

  Further, the holding portion 15 is provided with a first vertical piece groove portion 42 and a second vertical piece groove portion 43 as a vertical piece holding portion that accommodates the vertical piece portion 9 of the ceiling base material 5, so that at the time of cutting. Deformation of the vertical piece 9 of the ceiling base material 5 can be prevented.

  Further, the ceiling base material 5 includes a lower ridge 13 erected from the horizontal piece 10, and a horizontal piece groove 44 as a horizontal piece holding portion with which the lower ridge is engaged with the holding portion 15. By providing the above, it is possible to prevent deformation of the lateral piece 10 of the ceiling base material 5 at the time of cutting.

  Further, the cutting blade 16 is formed in a mountain shape, and the trajectory of the tip portion 46 of the cutting blade 16 is shifted from the vertical piece portion 9, thereby smoothly preventing deformation of the ceiling base material 5 during cutting. The ceiling base material 5 can be cut.

  Further, a blade as positioning means for positioning the cutting blade 16 in either a state in which the cutting blade 16 is dropped and the ceiling base material 5 is accommodated in the holding portion 15 or a state in which the ceiling base material 5 can be cut by the cutting blade 16 By providing the side long hole 51, the large diameter portion 52, and the pin 60, the ceiling base material 5 can be accommodated and the ceiling base material 5 can be easily positioned.

  Note that the second vertical piece groove portion 43 and the horizontal piece groove portion 44 of the upper portion 30 of the second outer plate material 19 are formed in a shape similar to the vertical piece portion 9 and the horizontal piece portion 10 of the ceiling base material 5. Therefore, the holding portion 15 includes a second vertical piece groove 43 and a horizontal piece groove 44 that match the shapes of the vertical piece 9 and the horizontal piece 10 of the ceiling base material 5 having various shapes. A plurality of upper portions 30 of the outer plate material 19 may be prepared and replaced as appropriate.

  The shapes of the fixed handle 55 and the movable handle 57 of the operation unit 17 may be curved as shown in FIG. 10 or may be other shapes.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. The shape of the holding portion, the shape of the cutting blade, and the like can be changed as appropriate.

5 Ceiling base material (shape material)
9 Vertical piece
10 Horizontal piece
13 Lower ridge
14 Cutting tool
15 Holding part
16 Cutting blade
42 First vertical piece groove (vertical piece holder)
43 Second groove for vertical piece (holding part for vertical piece)
44 Horizontal piece groove (Horizontal piece holder)
45 Engagement part
51 Blade side slot (positioning means)
52 Large diameter part (positioning means)
60 pins (positioning means)

Claims (3)

A holding portion that positions and accommodates a cross-section inverted T-shaped profile composed of a vertical piece portion and a horizontal piece portion projecting left and right at the lower end of the vertical piece portion;
A cutting blade that cuts the profile toward the holding portion ,
The holding portion includes a vertical piece groove that accommodates the vertical piece,
On the upper part of the groove for the vertical piece, an engaging part with an enlarged width dimension is formed,
The cutting blade is formed in a mountain shape, the cutting tool trajectory of the tip of the cutting blade is characterized in that it is drawing on the opposite side of the engaging portion from the center of the groove for the longitudinal strips. 2. The cutting tool according to claim 1, further comprising a horizontal piece holding portion that can engage with a protruding portion standing from the horizontal piece portion. A state in which the shape member can be accommodated in the holding portion;
The cutting tool according to claim 1 or 2, further comprising positioning means for positioning the cutting blade in any state in which the profile can be cut.

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