JP2015013339A - Attachment for hydraulic type manual cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attachment for a hydraulic type manual cutting device which can cut an object safely and quickly.SOLUTION: An attachment 20 for a hydraulic type manual cutting device is fitted as detachable to a hydraulic drive mechanism 10 which comprises a base part 11, a cylindrical cylinder 12 provided at the base part 11 and a rod 13 housed in the cylinder 12 and reciprocated hydraulically. The attachment 20 comprises a pair of arms 21A, 21B pivotally-supported as rotatable by the base part 11 and link mechanisms 22 which connect each base end side of the pair of arms 21A, 21B to the rod 13. At the inside edge of each arm 21A, 21B, cutting blades 23 are formed, and the tip of each arm 21A, 21B is a claw part 24 extending to the inside.

Description

  The present invention relates to an attachment for a hydraulic manual cutting device. Specifically, the present invention relates to an attachment for a hydraulic manual cutting device that is detachably attached to a hydraulic drive mechanism of the hydraulic manual cutting device.

Conventionally, in building renovation work and demolition work, a small cutting device driven by hydraulic pressure is sometimes used to cut existing metal or non-metal members (see Patent Document 1).
Such a cutting device includes, for example, a hydraulic drive mechanism and an attachment that is attached to and detached from the hydraulic drive mechanism (see, for example, Patent Document 1).

The attachment includes a pair of arms rotatably supported by a base portion, and a link mechanism that connects the base end side of these arms and a hydraulic drive mechanism.
The arm has an inwardly curved shape, and a cutting blade is formed on the inner edge of the arm.

  According to the above cutting device, the hydraulic drive mechanism is driven to advance and retract the rod with respect to the cylinder. Accordingly, the pair of arms are rotated via the link mechanism to open and close the pair of arms. Therefore, by placing the object between the arms and then driving the hydraulic drive mechanism, the pair of arms are closed, and the object is sandwiched and cut by the cutting blades of these arms.

JP 2007-30094 A

However, in the cutting apparatus as described above, the object is sandwiched between cutting blades, and the object is cut only by shearing.
Therefore, when the target object breaks, the restraint stress is released at once, and the target object may rebound toward the operator. As a result, in order to ensure the safety of the workers, it was necessary to perform the work carefully, and there was a possibility that the construction period would be prolonged.
In addition, because the object is cut only by shearing, it is not possible to cut a high-strength steel material or a steel material whose width dimension is larger than the opening width of the cutting blade, and the type and size of the object that can be cut are limited. There was a problem.

  An object of this invention is to provide the attachment for hydraulic manual cutting devices which can cut | disconnect a target object safely and rapidly, without limiting the kind and magnitude | size of a target object.

  An attachment for a hydraulic manual cutting device according to claim 1 (for example, an attachment 20 described later) includes a base (for example, a base 11 described later) and a cylindrical cylinder (for example, a cylinder 12 described later) provided in the base. ) And a rod (for example, a rod 13 described later) that is housed in the cylinder and advances and retracts by hydraulic pressure, and is detachably attached to the hydraulic drive mechanism (for example, a hydraulic drive mechanism 10 described later), A pair of arms (for example, arms 21A and 21B to be described later) rotatably supported by the base, and a link mechanism (for example, a link to be described later) that connects each base end side of the pair of arms and the rod. A cutting blade (for example, a cutting blade 23 described later) is formed on the inner edge of each arm, and the tip of each arm Claw portions (e.g., the claw portion 24 to be described later) extending toward the characterized in that it is a.

According to this invention, the tip of the arm is a claw that extends inward. Therefore, when cutting the object, first, the object is disposed between the pair of arms, and the hydraulic drive mechanism is driven. Then, the pair of arms are closed, and the claw portion pinches the object, bites into the object and perforates, and releases the restraining stress of the object. Thereafter, when the hydraulic drive mechanism is further driven, the pair of arms are further closed, and the cutting blades of these arms sandwich and cut the object.
Therefore, since the object is cut by the cutting blade in a state where the restraining stress of the object is released, the object can be prevented from bouncing back toward the operator, and the object can be cut safely and quickly.
In addition, after the nail portion bites into the object and perforates, the object is sandwiched and cut by the cutting blade, so that the object is a high-strength steel material or a steel material whose width dimension is larger than the opening width of the cutting blade. It can be cut reliably, and the type and size of the object are not limited.

The attachment for a hydraulic manual cutting device according to claim 2 has a predetermined length and a straight line (for example, a straight line U to be described later) orthogonal to an inner edge (for example, an inner edge R _{1 to be} described later) of the claw part, or When a straight line (for example, a straight line V, which will be described later) orthogonal to an outer edge (for example, a later-described outer edge R ₂ ) of the nail part is drawn, an intersection (for example, P ₁ and Q, which will be described later) of the straight line and the inner edge of the claw part will be described. ₁ ) (for example, M ₁ and N ₁ described later) and an intersection (for example, P ₂ and Q ₂ described later) between the straight line and the outer edge of the claw portion (for example, M ₂ and N described later) ₂ ) (for example, θ ₁ , θ ₂ described later) is 45 ° or less.

Here, the predetermined dimension is, for example, about 8 mm or less.
When the cutting blade is used repeatedly, the tip of the claw portion may be broken with a width of about 8 mm.
However, according to the present invention, even if the tip of the claw portion is bent with a predetermined dimension, that is, a width of about 8 mm, the angle formed by the inner edge and the outer edge of the remaining claw portion is 45 ° or less. Therefore, even if the tip of the nail part is broken, the remaining nail part is sharpened and regenerated, and the object can be pinched by the regenerated nail part so that the cutting blade can be used repeatedly over a long period of time.

  In the attachment for a hydraulic manual cutting device according to claim 3, the radius of curvature of the cutting blade (for example, a curvature radius D described later) is an outer diameter dimension of the target (for example, target W described later) (for example, described later). The outer diameter dimension t) is greater than or equal to.

According to this invention, the curvature radius of the cutting blade is set to be equal to or larger than the outer diameter of the object. By increasing the radius of curvature of the cutting blade in this way, the object can be reliably sandwiched between the claw portions.
When the radius of curvature of the cutting blade is smaller than the outer diameter of the object, the opening width of the cutting blade is reduced, so that even if the object is to be sandwiched between the claws, the object may be sandwiched between the claws. become unable.

The attachment for a hydraulic manual cutting device according to claim 4 includes two straight lines (for example, a straight line L to be described later) extending from the center of curvature of the cutting blade (for example, a center of curvature O to be described later) to both ends of the blade span of the cutting blade. ₁ , L ₂ ), the angle formed by the two straight lines is 60 ° or more.

According to this invention, the angle formed by the two straight lines reaching both ends of the cutting blade is 60 ° or more. By doing in this way, since the blade span of a cutting blade becomes long and a nail | claw part protrudes inside, a target object can be pinched | interposed reliably with a nail | claw part.
When the angle formed by the two straight lines extending from the center of curvature of the cutting blade to both ends of the blade span is less than 60 °, even if the object is sandwiched between the nail portions, the cutting blade is not the nail portion but the object. It hits and it becomes impossible to pinch | interpose a target object with a nail | claw part.

  According to the present invention, the tip of the arm is a claw portion extending inward. Therefore, when cutting the object, first, the object is disposed between the pair of arms, and the hydraulic drive mechanism is driven. Then, the pair of arms are closed, and the claw portion pinches the object, bites into the object and perforates, and releases the restraining stress of the object. Thereafter, when the hydraulic drive mechanism is further driven, the pair of arms are further closed, and the cutting blades of these arms sandwich and cut the object. Therefore, since the object is cut by the cutting blade in a state where the restraining stress of the object is released, the object can be prevented from bouncing back toward the operator, and the object can be cut safely and quickly. In addition, after the nail portion bites into the object and perforates, the object is sandwiched and cut by the cutting blade, so that the object is a high-strength steel material or a steel material whose width dimension is larger than the opening width of the cutting blade. It can be cut reliably, and the type and size of the object are not limited.

It is a top view of the cutting device to which the attachment concerning one embodiment of the present invention was applied. It is an enlarged plan view of the front-end | tip part of the cutting device which concerns on the said embodiment. It is a figure for demonstrating operation | movement of the cutting device which concerns on the said embodiment. It is a figure for demonstrating the procedure which cut | disconnects a target object using the cutting device which concerns on the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view of a hydraulic manual cutting device 1 to which an attachment 20 according to an embodiment of the present invention is applied.
The hydraulic manual cutting device 1 includes a hydraulic drive mechanism 10 and an attachment 20 for a hydraulic manual cutting device that is detachably attached to the hydraulic drive mechanism 10.

  The hydraulic drive mechanism 10 includes a base 11, a cylindrical cylinder 12 provided in the base 11, and a rod 13 that is accommodated in the cylinder 12 and moves forward and backward by hydraulic pressure.

  The attachment 20 includes a pair of steel arms 21A and 21B that are rotatably supported on the base 11 by a rotary shaft 14, and a link mechanism that connects the base end side of each of the pair of arms and the tip of the rod 13. 22.

A cutting blade 23 is formed on the inner edges of the arms 21A and 21B.
The tips of the arms 21A and 21B are claw portions 24 that extend inward. The cutting blade 23 reaches the tip of the claw portion 24, and the tip of the claw portion 24 has a sharp shape.
The link mechanism 22 is a pair of linear members extending linearly, and is rotatably connected to the rod 13 on one end side and rotatably connected to the arms 21A and 21B on the other end side.

  The curvature radius D of the cutting blade 23 is not less than the outer diameter dimension t of the object W to be cut (see FIG. 3). For example, when the object W is a square steel pipe of 100 mm × 100 mm or a square steel pipe of 120 mm × 120 mm, the curvature radius of the cutting blade 23 is set to 120 mm or 150 mm.

When two straight lines L ₁ and L ₂ extending from the center of curvature O of the cutting blade 23 to both ends of the cutting blade 23 are drawn, the angle formed by these two straight lines L ₁ and L ₂ is 60 °. Here, it is 70 °.

  FIG. 2 is an enlarged plan view of the tip portion of the cutting blade 23. Hereinafter, the cutting blade 23 of the arm 21A will be described, but the cutting blade 23 of the arm 21B has the same configuration.

As shown in FIG. 2 (a), the inner edge of the cutting blade 23 and _{R 1,} the outer edge of the cutting blade 23 as _{R 2,} draw a straight line U the length perpendicular to the inner edge _{R 1} of the cutting blade 23 at 8 mm. Then, a tangent _{M 1} at the intersection _{P 1} of the straight line U and the inner edge _{R 1,} an angle theta ₁ formed by the tangent line _{M 2} at an intersection P2 of the straight line U and the outer edge R2 has a 45 ° or less.
The tip of the claw portion 24 extends to before the intersection _{P 3} between the tangent line _{M 1} and the tangent _{M 2.}

Alternatively, as shown in FIG. 2 (b), draw a straight line V which length is orthogonal to the outer edge _{R 2} of the cutting blade 23 at 8 mm. Then, a tangent _{N 1} at intersection point to _{Q 1} between the straight line V and the inner edge _{R 1,} an angle theta ₂ formed by the tangent line _{N 2} at intersection point _{Q 2} between the straight line V and the outer edge _{R 2} has a 45 ° or less.
The tip of the claw portion 24 extends to before the intersection _{Q 3} between the tangent line _{N 1} and tangent _{N 2.}

The operation of the hydraulic manual cutting device 1 described above is as follows.
In the state shown in FIG. 1, when the hydraulic drive mechanism 10 is driven to advance the rod 13, the link mechanism 22 presses the arms 21A and 21B and the arms 21A and 21B are rotated as shown in FIG. 14 is rotated about the center of rotation, and the arms 21A and 21B are closed.
On the other hand, when the hydraulic drive mechanism 10 is driven and the rod 13 is retracted in the state shown in FIG. 3, the link mechanism 22 pulls the arms 21A and 21B and the arms 21A and 21B rotate as shown in FIG. The arm rotates around the shaft 14 and the arms 21A and 21B open.

Next, a procedure for cutting the object W using the hydraulic manual cutting device 1 will be described with reference to FIG. The object W is a t × t square steel pipe.
First, the object W is disposed between the pair of arms 21A and 21B, and the hydraulic drive mechanism 10 is driven. Then, the pair of arms 21 </ b> A and 21 </ b> B closes, the claw portions 24 of the arms 21 </ b> A and 21 </ b> B bite into the object W, and the hole 30 is drilled in the object W. Thereby, the restraint stress of the target object W is released.
Thereafter, when the hydraulic drive mechanism 10 is further driven, the pair of arms 21A and 21B are further closed and the claw portion 24 enters deeply into the hole 30, so that the hole 30 is enlarged. Then, the object W is sandwiched and cut by the cutting blades 23 of the pair of arms 21A and 21B.

According to this embodiment, there are the following effects.
(1) Since the object W is cut by the cutting blade 23 in a state where the object W is perforated by the claw portion 24 and the restraining stress of the object W is released, the object W rebounds toward the operator. Therefore, the object W can be safely and quickly cut. Moreover, since the nail | claw part 24 bites into the target object W and punctures, the target object W is pinched and cut | disconnected by the cutting blade 23, Therefore The target object W is a high intensity | strength steel material and a width dimension is larger than the opening width of a cutting blade. Even if it is a steel material, it can cut | disconnect reliably and the kind and magnitude | size of the target object W are not limited.

(2) Even if the tip of the claw portion 24 is bent with a width of about 8 mm, the angle formed by the inner edge R ₁ and the outer edge R ₂ of the remaining claw portion 24 is 45 ° or less. Therefore, even if the tip of the claw portion 24 is broken, the remaining claw portion 24 is sharpened and regenerated, and the object W can be pinched with the regenerated claw portion 24 so that the cutting blade 23 can be repeated over a long period of time. Can be used.

  (3) The curvature radius D of the cutting blade 23 is set to be equal to or greater than the outer diameter dimension t of the object W. Thus, by increasing the radius of curvature D of the cutting blade 23, the object W can be reliably sandwiched between the claw portions 24.

(4) The angle formed by the _two straight lines L ₁ and L ₂ reaching both ends of the blade span of the cutting blade 23 was set to 60 ° or more. By doing in this way, since the blade span of the cutting blade 23 becomes long and the nail | claw part 24 protrudes inside, the target object W can be pinched | interposed reliably with the nail | claw part 24. FIG.

  (5) Since the tip of the claw portion 24 has a sharp shape, the object W can be easily perforated. Further, even if the tip of the claw portion 24 is worn, it can be used again only by polishing, so that the durability of the attachment 20 is enhanced.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

D ... curvature radius O ... center of curvature R 1 _... inner edge R 2 _... outer edge W ... object t ... outer diameter 1 ... hydraulic manual cutting device 10 ... hydraulic drive mechanism 11 ... base 12 ... cylinder 13 ... rod 14 ... rotating shaft 20 ... Attachment 21A, 21B ... Arm 22 ... Link mechanism 23 ... Cutting blade 24 ... Claw part 30 ... Hole

Claims (4)

An attachment for a hydraulic manual cutting device detachably attached to a hydraulic drive mechanism comprising a base, a cylindrical cylinder provided in the base, and a rod accommodated in the cylinder and advanced and retracted by hydraulic pressure,
A pair of arms rotatably supported by the base;
A link mechanism for connecting the base end side of each of the pair of arms and the rod;
A cutting blade is formed on the inner edge of each arm,
An attachment for a hydraulic manual cutting device, wherein the tip of each arm is a claw portion extending inward. When the length is a predetermined dimension and a straight line orthogonal to the inner edge of the claw part or a straight line orthogonal to the outer edge of the claw part is drawn,
The angle formed by the tangent at the intersection of the straight line and the inner edge of the claw and the tangent at the intersection of the straight line and the outer edge of the claw is 45 ° or less. Attachment for hydraulic manual cutting device as described.   The attachment for a hydraulic manual cutting device according to claim 1 or 2, wherein a radius of curvature of the cutting blade is equal to or larger than an outer diameter of an object. When drawing two straight lines from the center of curvature of the cutting blade to both ends of the blade span of the cutting blade,
The hydraulic manual cutting device attachment according to claim 3, wherein an angle formed by the two straight lines is 60 ° or more.

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