JP4783043B2 - Sheath tube cutter - Google Patents

Description

  The present invention relates to a sheath and a tube cutter for cutting a sheath tube used for the guide and protection of electric wires and hot water and hot water supply tubes.

  Conventionally, in a sheath tube used for the guide and protection of an electric wire and a hot water supply pipe, a tool for cutting only the sheath pipe without damaging the internal electric wire and the hot water supply pipe has been studied. In Document 1, a cutter body having a receiving plate that enters a groove on the back side of a corrugated resin tube (corresponding to the sheath tube in the present invention) is provided with a tool post that can be moved forward and backward with respect to the receiving portion by a feed screw. Provided with two elastic guide plates that sandwich the crest of the corrugated resin tube on this tool post, and a cutting blade that is positioned between these elastic guide plates and always cuts the corrugated resin tube at the center of the mountain Is disclosed.

  However, the cutter is expensive because the mechanism for allowing the tool post to move forward and backward is complicated and the process for manufacturing the cutter is complicated. Also, the cutter body becomes large due to structural members that can move forward and backward, and depending on the working environment conditions such as cutting in a narrow place in equipment at the construction site, the cutter body rotates once along the sheath side However, there is a problem that workability is inferior because it interferes with surrounding objects.

Japanese Patent Laid-Open No. 10-277835

  An object of the present invention is to solve the above-mentioned conventional problems and to provide a sheath tube cutter capable of easily cutting a sheath tube even in a narrow place.

The sheath tube cutter according to claim 1 is a sheath tube cutter that cuts a sheath tube having a circular cross-sectional shape with a corrugated cross section in the axial direction of the tube wall, and the main body introduces the sheath tube into a circular center hole. It consists of a donut-shaped disk having a possible notch, and the inner surface of the center hole is provided with cutting blades capable of cutting the sheath tube along the circumferential direction at two opposing positions , A portion of the cutout portion that communicates with the center hole is provided with a pair of sheath contact portions that are spaced apart by a diameter of the center hole and that face each other in a parallel relationship. Each of the protrusions is provided in a state where the protrusions are opposed to each other, and the protrusions are held in a state where the sheath tube is in contact with the inner surface of the center hole, and the sheath pipe introduced into the center hole is cut from the center hole. this is intended to prevent the move toward the notch portion The features.

Sheath tube cutter according to claim 2, there is provided a sheath tube cutter according to claim 1, the sheath pipe abutment portion of the inner surface portion and the cut portion of the center hole, axial cross-section when introducing the sheath tube Guide ribs that can be fitted in the corrugated shape are provided.

The sheath tube cutter according to claim 3 is the sheath tube cutter according to claim 2, wherein a plurality of guide ribs are provided on the inner surface of the center hole, and the cutting blade is located between adjacent guide ribs. It is provided, and it is possible to cut a peak portion in a wave shape of an axial cross section of a sheath tube at the time of cutting.

  The material of the main body in the present invention is not particularly limited, and examples thereof include metals, synthetic resins such as thermosetting resins and thermoplastic resins.

  The method of manufacturing the sheath tube cutter of the present invention is not particularly limited. For example, when a method in which a cutting blade is sandwiched and bonded between two main body members obtained by dividing a donut-shaped disk into two in the thickness direction is used. Is preferable in that the number of parts is small, the assembly work is simple, and the cost is low.

  In the case of using a synthetic resin as the main body, the cutting blade is set in advance in a predetermined position in a molding die such as injection molding, and then the resin is injected for molding (so-called “insert molding method”). This is preferable in that it can be manufactured at a lower cost without requiring any subsequent assembly work.

  According to the present invention, the main body comprises a donut-shaped disk having a cutout portion capable of introducing a sheath tube into the center hole, and a cutting blade capable of cutting the sheath tube along the circumferential direction on the inner surface portion of the center hole. Therefore, the main body can be easily cut by rotating it in the circumferential direction, and the space required for the cutting operation is approximately the same as the size of the disk-shaped main body. Accordingly, the workability is remarkably improved particularly in a residential construction site where the work space is narrow and it is necessary to cut many sheaths of the same diameter at one site. Further, since the component member can be easily manufactured with a small number of parts, a very inexpensive sheath cutter can be provided.

  In the above, when the guide rib that can be fitted in the corrugated shape of the axial cross section when the sheath tube is introduced to the inner surface portion of the center hole and the sheath of the notch portion, the cutting position This makes it easier to determine the position of the sheath and the ribs on the tube during rotation, and prevents the sheath from being displaced in the direction of the tube axis. Therefore, the above effect can be further ensured. In addition, when a plurality of the guide ribs are provided, the above effect is further ensured.

  In addition, when a cutting blade is provided in the middle of a plurality of guide ribs provided on the inner surface of the center hole, and when it is possible to cut the peak in the corrugated shape of the sheath in the axial direction at the time of cutting, the sheath tube Since there is no fear of damaging the electric wire or the water / hot water supply pipe inserted in the interior, only the mountain portion can be selectively cut selectively, so that the above effect is further ensured.

  In addition, when the cutting blade height is not less than the thickness of the peak portion in the corrugated shape of the sheath in the axial direction of the sheath and not more than the height of the peak portion and the valley portion, the tip of the cutting blade is Protruding to the inside can be prevented, and it is difficult to damage the electric wire or the hot water supply hot water pipe inserted into the sheath pipe as described above.

  In addition, when the protrusion that can prevent the sheath introduced in the center hole from moving at the time of cutting is provided in the notch, it is possible to cut at a stable position, so the above effect is It will be more certain.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing an example of a sheath tube cutter of the present invention together with a sheath tube 10 (imaginary line).
In FIG. 1, the main body 1 has a cutout portion 3 into which a sheath tube 10 can be introduced into a center hole 2 of a donut disk.

  Two cutting blades 4, 4 capable of cutting the sheath tube 10 along the circumferential direction are provided on the inner surface of the center hole 2 at positions facing each other. Therefore, the sheath 10 can be cut by rotating the main body 1 at least 180 degrees in the circumferential direction.

  The outer diameter d1 of the doughnut-shaped disk (hereinafter also referred to as “the outer diameter of the main body 1”) is usually preferably the outer diameter d2 + 10 mm to d2 + 100 mm of the sheath tube 10, and the sheath tube is easily cut even in a narrow place. be able to.

FIG. 2 is a schematic perspective view showing another example of the sheath tube cutter according to the present invention. FIG. 3A is a schematic sectional view for explaining a fitting state of the sheath tube and the guide rib, and FIG. It is an expanded sectional view.
In FIG. 2, four guide ribs 51, 52, 53, 54 that can be fitted in the corrugated shape of the sheath tube are provided on the inner surface portion 2 a of the center hole 2 and the sheath tube contact portion 3 a of the notch portion 3. ing. Moreover, the cutting blades 4 and 4 are provided in the position which opposes each other in the middle position of the guide ribs 52 and 53. Other configurations are the same as those shown in FIG. In the figure, 11 is a water supply pipe inserted into the sheath pipe 10.

  In the above, as shown in FIGS. 3A and 3B, the corrugated shape of the sheath tube 10 and the guide ribs 51 to 54 can be fitted to prevent the sheath tube from being displaced in the tube axis direction at the time of cutting. At the same time, as shown in FIG. 3 (b), only the crests of the wavy shape can be selectively cut on the same circumference, and there is no fear of damaging the water supply pipe 11.

  Further, as shown in FIG. 3B, the height h of the cutting blade 4 in the present invention is to prevent the water pipe 11 inserted into the sheath pipe 10 from being damaged. It is preferable that the thickness is not less than the thickness t1 of the peak portion and not more than the height t2 of the valley portion.

FIG. 4 is an explanatory view showing another example of the sheath tube cutter according to the present invention. FIG. 4A is a schematic perspective view of the same, and FIG. 4B is a schematic top view showing the sheath pipe 10 (imaginary line) and the water supply pipe 11 (imaginary line).
In the sheath pipe cutter, two pairs of projections 6, 6,... That can prevent the sheath pipe 10 introduced into the center hole 2 from moving at the time of cutting are provided on the sheath pipe contact portion 3a of the notch portion 3, It is provided so as to face each other. Other configurations are the same as those shown in FIGS.

  In this case, the protrusions 6, 6,... Prevent the introduced sheath tube 10 from moving during cutting and enable cutting at a stable position.

It is a schematic diagram which shows an example of the sheath tube cutter which concerns on this invention with a sheath tube. It is a model perspective view which shows another example of the sheath tube cutter which concerns on this invention. (A) is a schematic cross section explaining the fitting state of a sheath pipe and a guide rib, (b) is the same expanded sectional view. It is explanatory drawing which shows another example of the sheath tube cutter which concerns on this invention. (A) is a model perspective view, (b) is a model top view shown with a sheath pipe | tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body 2 Center hole 2a Inner surface part 3 Notch part 3a Sheath pipe | tube contact part 4 Cutting blade 51,52,53,54 Guide rib 6 Protrusion 10 Sheath pipe 11 Water supply pipe

Claims (3)

A doughnut-shaped disk having a notch that can introduce a sheath into a circular center hole, the sheath being a sheath that cuts a tube with a circular cross-sectional shape having a corrugated cross-section in the axial direction of the tube wall Cutting blades capable of cutting the sheath tube along the circumferential direction are provided at two opposing positions on the inner surface of the center hole ,
The portion communicating with the central hole in the cutout portion is provided with a pair of sheath contact portions facing each other in a separated state and in parallel with the diameter of the central hole,
Each of the pair of sheath contact parts is provided with a protrusion facing each other,
The protrusion holds the sheath tube in contact with the inner surface portion of the center hole, and prevents the sheath tube introduced into the center hole from moving from the center hole toward the notch. Characteristic sheath tube cutter. In the sheath tube cutter according to claim 1,
Center the sheath pipe abutment portion of the inner surface portion and the notch portion of the bore, axial sectional waveform shape can be fitted a guide rib of the that provided or tubing cutter in introducing sheath tube. In the sheath tube cutter according to claim 2,
A plurality of guide ribs are provided on the inner surface portion of the center hole, and a cutting blade is provided at a position sandwiched between adjacent guide ribs , so that a crest portion in the corrugated shape of the sheath in the axial direction can be cut at the time of cutting. Tei Ru, pipe cutter.

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