JP2502009Y2 - Cutter block for screw rod - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a screw rod cutter block 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.

[0002]

2. Description of the Related Art A cutter block is used as a jig for cutting rods such as reinforcing bars and steel pipes. Cutter
The blocks are grouped into two, and one of them is fixed to a movable member such as a piston and the other to a fixed member (non-movable member) such as a housing by bolting or the like.
Then, the piston is moved forward, the movable cutter block,
The bar is shared and cut between the fixed cutter and the block.

A cutter utilizing a cutter block is
For example, it suffices to attach a movable cutter block to the tip of the piston and a fixed cutter block to the housing to move the piston forward, and it is relatively easy to reduce the size and weight of the structure. Further, since the cutting is performed by sharing, 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]

Normally, the blade surface of the cutter block is a smooth surface, but a so-called screw rod having a thread on the surface of the bar material is cut by a cutter with a smooth blade surface. Then, the screw thread is crushed and the nut cannot be screwed, and the cutter block having the smooth surface cannot be used for cutting the screw 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. 5, 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 thread diameter φ of the screw rod is equally divided into halves, FIGS. 6A1 and 6B
As shown in 1), the initial position of the movable cutter block 114 is separated from the fixed cutter block by the screw diameter φ or more for disposing the screw rod 16 between the cutter blocks 112 and 114. And the movable cutter block 1
Unless 14 is moved forward by more than twice the screw diameter φ, the screw rod 16 cannot be cut, and the stroke S equal to or more than twice the screw diameter.
Is required (Fig. 7 (A2), (B2), Fig. 8 (A
3), (B3)).

When cutting a rod other than a threaded 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 equal to 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 a rod (screw rod) by a cutter block with a smooth surface. 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 a long time to cut the screw rod by the cutter block for the screw rod, and a quick cutting operation cannot be performed. Also, in order to secure double the stroke, it is necessary to lengthen the piston and cylinder, which is a compact and lightweight hydraulic cutter.
Etc. are not available.

The object of the present invention is to provide a cutter block for a screw rod which 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 screw diameter of the screw rod is set to the movable cutter.
The blocks and fixed cutters are not equally divided into the screw holes of the block, but the size of each screw hole is modified.

That is, the screw diameters of the movable cutter block and the fixed cutter block are the same, and both are partial holes that are less than half the screw diameter of the screw rod. Further, the screw holes are not the same, and the screw holes of the fixed cutter block are deeper (larger) than the screw holes of the movable cutter block.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 (A) and 1 (B), the screw rod cutter block 10 of the present invention is a combination of movable and fixed cutter blocks 12 and 14, and is attached to 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. The movable cutter block 14 is moved forward to move the screw holes 12a,
Fig. 1 (A) shows the time when 14a stores and holds the screw rod 16.
(B) shows.

As shown in FIG. 1 (B), the threaded rod 16
From the shaft center 16a of the blade to the blade surface of the fixed cutter block
The cutter blocks 12 and 14 are configured so that a1 is smaller than the distance a2 to the blade surface of the movable cutter block. 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 in the relationship of a1 + b1 = a2 + b2 = φ / 2, so 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 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 with different numbers
Fixed cutter block 12, movable cutter block 14
It is preferable to form the fixed cutter block and the movable cutter block at a glance so as to be distinguishable from each other by forming them on the upper surface of each.
Characters or the like 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, 14 are formed.
a stores the thread of the screw rod 16 all around, does not hold,
The threads are not pressed all around from both sides. Therefore, the pushing force at the time of cutting is small and the screw rod
The screw rod is cut without crushing the 16 threads, and the nut can be screwed into the screw rod after cutting without any trouble.

Further, according to the cutter block 10 having the above-described structure, the minimum stroke required for the movable cutter block 14 to perform cutting is as follows by the clearance a1 + a2 of the blade surface.
Can be reduced by a distance equal to.

For comparison, the thread diameter φ of the threaded rod is
Fixed cutter block 112, movable cutter block 1
The minimum stroke required for cutting by a known cutter block (see FIGS. 5 to 8) equally divided into 14 screw diameters 112a and 114a is obtained. In this case, b1 = b2 = φ / 2, and the cutter block 11
The blade surfaces of 2, 114 are flush with each other.

For example, the cutting of a 3/8 "(about 9.6 mm) threaded rod 16 will be described.
The movable cutter block 114 has an initial position shown in FIG.
1) and (B1), the screw diameter is set to be 9.6 mm or more away from the fixed cutter block.

Movable cutter block 114 from the initial position
When the blade is advanced by a distance corresponding to the gap, the blade surface becomes flush and the cutting is started (see FIGS. 7A2 and 7B2). Furthermore, for example, until the screw bottom of the blade surface intersects, the screw diameter is equivalent to 9.6 m.
If the screw rod 16 is moved forward by m and cut, the stroke s of the movable cutter block 114 needs to be at least twice the screw diameter (s> 2φ = 2 × 9.6 = 19.2 mm).

On the other hand, also in the cutter block 10 of the present invention, the movable cutter block 14 is shown in FIG.
As shown in 1) and (B1), the screw diameter (φ) is separated by 9.6 mm or more from the fixed cutter block.

However, in this invention, the cutter block 1
Since the blade surfaces 2 and 14 are separated from each other by the distance a1 + a2, the movable cutter block 14 is moved away from the initial position by the distance b1 + a2.
When the screw rod 16 is moved forward by b2, the screw rod 16 is housed and held from both sides (see FIGS. 7A2 and 7B2). And, the movable cutter block 14 is equivalent to the screw diameter of 9.6 m.
When it is further advanced by m, the screw bottoms of the blade surfaces intersect 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, Fig. 1 (B)
As can be seen from the above, b1 = φ / 2-a1 and b2 = φ / 2-a2, so b1 + b2 = φ-a1-a2. Therefore, the stroke
Is s> 2φ-a1-a2, and the distance is at least less than twice the screw diameter by the blade surface spacing a1 + a2, and the blade surface spacing a1 + a2.
The required stroke is shortened by a distance corresponding to. 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, for example, 2φ = 2x9.6 = 19.2mm
Then, a high stroke shortening rate of 23% is obtained, demonstrating the effectiveness of this invention.

As described above, in the present invention, the blade surface spacing a1 + a
Since the stroke is shortened by a distance equivalent to 2, 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 is reduced, which is advantageous in terms of cost, and the size and weight of the hydraulic cutter are reduced, so that fatigue in cutting work can 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. It goes without saying that it will be done.

[0029]

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 thread is cut from both sides. Not pressed all around. Therefore, the pressing 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 reducing the pressing force, a hydraulic cutter or the like one class below can be used, which is advantageous in terms of cost and reduces fatigue during cutting work.

[Brief description of drawings]

1 is a plan view and a front view of a screw rod cutter block of the present invention when a 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.

[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 Thread rod center line, distance between blade surfaces

Claims (1)

(57) [Scope of utility model registration request] 1. A screw rod cutter block comprising a combination of a movable cutter block and a fixed cutter block having a threaded blade face corresponding to a screw rod to be cut, wherein the screw holes of the movable cutter block and the fixed cutter block have the same diameter. And each of them is a partial hole of less than half the screw diameter of the screw rod to be cut, and the screw hole of the fixed cutter block is formed deeper than the screw hole of the movable cutter block. Cutter block for screw rod.