JPH052809U - Screw block cutter block - Google Patents

Abstract

(57) [Summary] [Purpose] To cut a threaded rod under a few strokes without crushing the thread. [Structure] The fixed cutter block 12 and the movable cutter block 14 each have screw holes 12a and 14a which are partial holes having a diameter less than half the screw diameter of the screw rod. The screw holes 12a and 14b are not equal to each other, and the screw hole 12a of the fixed cutter lock 12 is formed larger than the screw hole 14a of the movable cutter block 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cutter block for a screw rod, which comprises a combination of a movable and a fixed cutter block having a blade surface with a screw hole corresponding to a screw rod to be cut.

[0002]

[Prior Art]

 Cutter blocks are used as jigs for cutting rods such as reinforcing bars and steel pipes. The cutter blocks are made up of two sets, for example, one is fixed to a movable member such as a piston and the other is fixed to a fixed member (non-movable member) such as a housing by bolting or the like. Then, the piston is moved forward to share and cut the bar material between the movable cutter block and the fixed cutter block.

A cutter using a cutter block is, for example, a structure in which a movable cutter block is attached to the tip of a piston and a fixed cutter block is attached to a housing and a piston is moved forward. Can be made smaller and lighter. Further, since the cutting is performed by shearing, cutting can be performed quickly and easily, and efficient cutting can be performed. Furthermore, since no chips are generated and it is not necessary to supply cutting oil or the like, it is not necessary to consider the contamination of the surroundings with chips and cutting oil.

[0004]

[Problems to be solved by the device]

 Normally, the blade surface of the cutter block is a smooth surface, but if a so-called threaded rod with a thread on the surface of the bar is cut by a cutter with a smooth blade surface, the screw thread will collapse and the nut will be cut. The cutter block on the smooth surface cannot be used for cutting the threaded rod.

If a screw hole corresponding to the screw rod to be cut is provided on the blade surface of the cutter block, the screw rod can be cut without crushing the screw thread. In this type of screw rod cutting cutter block, as shown in FIG. 3, the thread diameters of the screw rods are equally divided into both the fixed cutter block 112 and the movable cutter block 114. ..

However, in the known configuration in which the screw diameter φ of the screw rod is equally divided into half, as shown in FIGS. 4A1 and 4B1, the screw rod 16 is inserted between the cutter blocks 112 and 114. The initial position of the movable cutter block 114 for installation is separated from the fixed cutter block by a screw diameter φ or more. If the movable cutter block 114 is not moved forward by more than twice the screw diameter φ, the screw rod 16 cannot be cut, and the stroke S more than twice the screw diameter is required (Fig. 4 (A2), (See (B2), (A3), (B3)).

When cutting a rod other than a screw rod with a cutter block having a smooth blade surface, the rod can be cut by moving the movable cutter block by a distance substantially equal to the rod diameter. In other words, in such cutting, the required stroke is almost the same as the rod diameter.

The stroke required for a cutter block with screw holes (cutter block for screw rods) (more than twice the screw diameter (= rod diameter) φ) is achieved by a cutter block with a smooth surface (screw rod). It is almost twice as much as the required stroke (more than 1 times the rod diameter φ) for other rods.

As described above, since double strokes are required, it takes time to cut the screw rod by the screw rod cutter block, and a quick cutting operation cannot be performed. Further, in order to secure double the stroke, it is necessary to lengthen the piston and cylinder, and it is not possible to use a small and lightweight hydraulic cutter or the like.

An object of the present invention is to provide a cutter block for a screw rod that can cut the screw rod under a small stroke without crushing the screw thread.

[0011]

In order to achieve this object, in the present invention, the thread diameter of the screw rod is not equally divided into the screw holes of the movable cutter block and the fixed cutter block, and the screw diameter is not evenly divided. The size of each screw hole is modified.

That is, each of the screw holes of the cutter block and the fixed cutter block is a partial hole of less than half the screw diameter of the screw rod. The respective screw holes are not equal, and the screw holes of the fixed cutter block are larger than the screw holes of the movable cutter block.

[0013]

【Example】

 An embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIGS. 1 (A) and 1 (B), a screw rod cutter block 10 of the present invention is a combination of movable and fixed cutter blocks 12 and 14, and a screw rod 16 to be cut. Corresponding screw holes 12a, 14a are formed in the blade surface of the cutter block, respectively.

In this invention, the diameter (screw diameter) of the screw rod 16 is not equally divided into the screw holes 12a and 14a of the movable cutter block and the fixed cutter block. 1 (A) and 1 (B) show the time points at which the screw holes 16a and 14a house and hold the screw rod 16 as the movable cutter block 14 advances.

As can be seen from FIG. 1B, the distance a1 from the axial center 16a of the screw rod 16 to the blade surface of the fixed cutter block is smaller than the distance a2 to the blade surface of the movable cutter block. In addition, the cutter blocks 12, 14 are constructed. Then, a gap equal to the distance a1 + a2 is left between the blade surfaces of the cutter blocks 12 and 14.

Here, the diameter of the screw rod (screw diameter) φ, the depth from the blade surface to the screw bottom, in other words, the screw hole sizes b1 and b2, and the distances a1 and a2 are a1 + b1 = a2 Since + b2 = φ / 2, b1> b2. That is, the screw hole b1 of the fixed cutter block is formed larger than the screw hole b2 of the movable cutter block. Since the width L1 of the fixed cutter block is formed to be larger than the width L2 of the movable cutter block due to the difference in size of the screw holes b1 and b2, it can be easily identified. However, the width L1 of the fixed cutter block and the width L2 of the movable cutter block may be equal.

Identification marks, for example, grooves 13 having different numbers of grooves are formed on the upper surfaces of the fixed cutter block 12 and the movable cutter block 14, respectively, so that the fixed cutter block and the movable cutter block can be seen at a glance. It should be identifiable. Characters may be used instead of the groove.

When the screw rod 16 is cut (sharing) by the cutter block 10 described above, the screw holes 12a and 14a do not store or embrace the screw thread of the screw rod 16 all around, and the screw thread 16 does not hold. Is not pressed all around from both sides. Therefore, the pressing force at the time of cutting is small, and the screw rod is cut without crushing the thread of the screw rod 16 so much that the nut can be screwed into the screw rod after cutting without any trouble.

Further, according to the cutter block 10 having the above configuration, the minimum stroke required for the movable cutter block 14 to perform cutting is equal to the clearances a1 + a2 of the blade surface as follows. It can be reduced by the distance.

For comparison, a known cutter block in which the thread diameter φ of the screw rod is equally divided into the screw holes 112a and 114a of the fixed cutter block 112 and the movable cutter block 114 in half. The minimum stroke required for cutting by (see FIGS. 3 and 4) is obtained. In this case, b1 = b2 = φ / 2, and the blade surfaces of the cutter blocks 112 and 114 are flush with each other.

For example, referring to the cutting of a 3/8 "(about 9.6 mm) threaded rod 16, the initial position of the movable cutter block 114 for placing the threaded rod 16 between the cutter blocks 112, 114. Is set at a distance of 9.6 mm or more from the fixed cutter block, as shown in FIGS. 4 (A1) and 4 (B1).

When the movable cutter block 114 is advanced from the initial position by the amount corresponding to the gap, the blade surface becomes flush and the cutting starts (see FIGS. 4 (A2) and (B2)). Further, for example, if the screw rod 16 is cut by advancing by 9.6 mm corresponding to the thread diameter until the thread bottoms of the blade surface intersect, the stroke s of the movable cutter block 114 is at least twice the thread diameter. (S> 2φ = 2x9.6 = 19.2mm) Required.

On the other hand, also in the cutter block 10 of the present invention, the movable cutter block 14 has a screw diameter (φ) from the fixed cutter block as shown in FIGS. 2 (A1) and (B1). ) Separated by 9.6 mm or more.

However, in this invention, since the blade surfaces of the cutter blocks 12 and 14 are separated from each other by the distance a1 + a2, when the movable cutter block 14 is advanced from the initial position by the distance b1 + b2, the screw rod 16 is moved. It is stored and held from both sides (see Figure 4 (A2) and (B2)). Then, when the movable cutter block 14 is further advanced by 9.6 mm corresponding to the screw diameter, the screw bottom of the blade surface intersects and the screw rod 16 can be cut.

In this case, the stroke s of the movable cutter block 14 is s> b1 + b2 + φ. Here, as can be seen from FIG. 1 (B), b1 = φ / 2-a1 and b2 = φ / 2-a2, so b1 + b2 = φ-a1-a2. Therefore, the stroke s is s> 2φ-a1-a2, and the distance is at least less than twice the screw diameter by the distance a1 + a2 between the blade surfaces, and a distance equivalent to the distance a1 + a2 between the blade surfaces is required. The stroke is shortened. For example, if b1 = 2.7mm and b2 = 2.4mm, then a1 + a2 = φ-b1-b2 = 9.6-2.7-2.4 = 4.5, the stroke is shortened by 4.5mm and the conventional stroke is shortened. If, for example, 2φ = 2x9.6 = 19.2 mm, a high stroke shortening rate of 23% is obtained, demonstrating the effectiveness of this invention.

As described above, in the present invention, the stroke is shortened by the distance corresponding to the interval a1 + a2 of the blade surfaces, so that the cutting work can be performed quickly. Further, by shortening the required stroke, small and lightweight pistons and cylinders to which the movable cutter block 14 is attached can be used, and a hydraulic cutter which is one class lower than the conventional one can be used. If the class is lowered, the cost of the hydraulic cutter will be cheaper, which is advantageous in terms of cost, and since the size and weight will be reduced, fatigue during cutting work will be reduced.

The above-described embodiments are intended to explain the present invention, and are not intended to limit the present invention in any way, and all modifications and alterations made within the technical scope of the present invention are also included in the present invention. Needless to say, it is included.

[0029]

[Effect of the device]

 As described above, since the screw hole of the cutter block of the present invention does not store and embrace the thread of the screw rod all around, when the screw rod is cut, the screw thread is pressed all around from both sides. Not done. Therefore, the pushing force at the time of cutting is small, and the screw rod is cut without crushing the screw thread so much that the nut can be screwed into the screw rod after cutting without any trouble.

Further, since the blade surfaces of the fixed and movable cutter blocks are separated from each other and the stroke is shortened by a distance corresponding to the distance between the blade surfaces, efficient cutting can be performed. Furthermore, by shortening the stroke and the pressing force, it is possible to use a hydraulic cutter one class below, which is cost-effective and reduces fatigue during cutting work.

[Brief description of drawings]

1 (A) and 1 (B) are a plan view and a front view of a cutter block for a screw rod of the present invention when the screw rod is stored and held from both sides.

2 (A1), (B1), (A2), (B2), (A3), (B3)] FIG. 2 is a schematic view of a cutting process by the cutter block of the present invention.

FIG. 3 is a front view of a known rod cutter block corresponding to FIG. 1 (B).

4 (A1), (B1), (A2), (B2), (A3), (B3)] FIG. 4 is a schematic view of a cutting process by a known cutter block shown in FIG.

[Explanation of symbols]

 10 Screw rod cutter block 12, 14 Fixed, movable cutter block 12a, 14a Screw hole 13 Identification mark (groove) 16 Screw rod 16a Screw rod center line φ Screw rod diameter (screw diameter) b1, b2 Screw hole Size (depth) a1, a2 distance between thread rod center line and blade surface

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[Procedure amendment]

[Submission date] April 8, 1992

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a plan view and a front view of a cutter block for a screw rod of the present invention when the screw rod is stored and held from both sides.

FIG. 2 is a schematic view of a cutting process by the cutter block of the present invention.

FIG. 3 is a schematic view of a cutting process by the cutter block of the present invention.

FIG. 4 is a schematic view of a cutting process by the cutter block of the present invention.

FIG. 5 is a front view of a known rod cutter block corresponding to FIG. 1 (B).

FIG. 6 is a schematic view of a cutting process by the known cutter block shown in FIG.

FIG. 7 is a schematic view of a cutting process by the known cutter block shown in FIG.

FIG. 8 is a schematic view of a cutting process by the known cutter block shown in FIG.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

[Figure 8]

Claims (1)

Claims for utility model registration: Claim 1. A cutter block for a screw rod comprising a combination of a movable and a fixed cutter block having a blade surface with a screw hole corresponding to a screw rod to be cut, the movable cutter block. , The fixed cutter block screw holes are all partial holes of less than half the screw diameter of the screw rod to be cut, and the fixed cutter block screw hole is larger than the movable cutter block screw hole. Cutter block for screw rod.