JP2010280011A - Rod-like member cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting device capable of securely preventing cut pieces from scattering even when cutting a solid rod-like member. <P>SOLUTION: Holding mechanisms 40 are arranged at both sides of a cutting-edge tool 34 to securely hold the rod-like member B during cutting. The holding mechanism 40 has a holding member 41 having a holding surface 41c and an elastic body 42. The holding member 41 contacts with the rod-like member first, the cutting-edge tool 34 contacts with the rod-like member B, and thereafter bites into the rod-like member B during cutting. The holding member 41 is displaced while compressing the elastic body 42 in this process. The holding member 41 securely holds the rod-like member B by holding force corresponding to repulsive force that the elastic body 42 generates. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a cutting device for cutting a rod-shaped member, and more particularly to a cutting device suitable for cutting a rod-shaped member made of a metal having high hardness (for example, heat-treated steel). In the present specification, the “bar-shaped member” is not limited to a straight bar, but is a bent bar, for example, a rod material bent into a ring shape like each chain ring of chains, or a padlock Includes shackles.

  In order to rescue a person confined in a building due to an earthquake disaster, it may be necessary to destroy padlocks, chains, etc. to open the doors or gates of the building. In this case, it is conceivable that the shackle of the padlock or the chain ring of the chain is cut using, for example, a reinforcing bar cutting device for building materials. At this time, in order to ensure the safety of the operator, it is important that the cutting object is not scattered at the time of cutting.

  Japanese Unexamined Patent Application Publication No. 2007-44812 discloses a reinforcing bar cutting device developed by the present inventor that can be suitably used mainly at a construction site. This rebar cutting device has a cutting tool with a simple gripping function. This cutting blade has a gripping projection having a slightly lower height than the cutting blade edge formed integrally with the cutting blade edge on the side of the cutting blade edge. At the very time when the reinforcing bar is cut by the cutting blade tip, the gripping projections that bite into the reinforcing bar firmly hold the reinforcing bar, thereby preventing scattering of the cut reinforcing bar. This rebar cutting device can also be used for the above-mentioned rescue application.

  However, from the viewpoint of strengthening crime prevention, there are padlock shackles and chain chains formed of materials with extremely high hardness (for example, heat-treated steel having a Rockwell hardness of about HRC 60). The gripping projection of the cutting blade having the configuration disclosed in Japanese Patent Application Laid-Open No. 2007-44812 functions effectively until the hardness of the object to be cut is about Rockwell hardness HRC40, but in the case of higher hardness The gripping projections cannot be sufficiently bitten into the object to be cut, and the cut pieces may be scattered.

JP 2007-44812 A

  This invention provides the cutting device which can prevent scattering of a cut piece reliably, even when cut | disconnecting a hard rod-shaped member.

  The present invention has a pair of blade supports that can be operated so as to be relatively close to each other, and cuts the rod-shaped member by bringing the cutting blades provided on each blade support into contact or close to each other. In the bar-shaped member cutting device configured as described above, gripping mechanisms for gripping the bar-shaped members are provided on both sides of the cutting blades of the blade support bodies, and the gripping mechanisms grip the bar-shaped members. A gripping member having a gripping surface and attached to the blade support so that the gripping surface can be displaced so as to move backward with respect to the cutting blade by being pushed by the rod-shaped member; and the blade support An elastic body that is interposed between a body and the gripping member, generates a repulsive force that resists displacement of the gripping member, and causes the gripping member to grip the rod-shaped member with a gripping force according to the repulsive force; Have The gripping mechanism is configured so that the gripping member first contacts the rod-shaped member and then the cutting blade contacts the rod-shaped member in the process in which the pair of blade supports are relatively close to each other. Provided is a rod-shaped member cutting device.

  According to the present invention, since the repulsive force of the elastic body that increases with an increase in the displacement of the gripping member is used as the source of the gripping force, the rod-shaped member is reliably held even immediately before the rod-shaped member is broken. Further, the gripping mechanism is configured so that the gripping member first comes into contact with the rod-shaped member and then the cutting blade comes into contact with the rod-shaped member in the process in which the blade support comes relatively close. Even when a relatively thin rod-shaped member is cut, it is possible to prevent the rod-shaped member from breaking before the gripping force by the gripping mechanism is sufficiently increased and scattering of the cut pieces.

The longitudinal direction fragmentary sectional view which shows the whole structure of one Embodiment of the rod-shaped member cutting device by this invention. It is a figure which shows only the head unit of a rod-shaped member cutting device, Comprising: The fragmentary sectional view which follows the cutting line II-II in FIG. Sectional drawing which follows the cutting line III-III in FIG. Sectional drawing which follows the cutting line IV-IV in FIG. It is a figure which shows the effect | action of a rod-shaped member cutting device, Comprising: The figure which shows the position change of the holding member with respect to a cutting blade. Schematic which shows other embodiment of this invention. Schematic which shows other embodiment of this invention.

  A rod-shaped member cutting device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

  As shown in FIGS. 1 and 2, the rod-shaped member cutting device includes a hydraulic pressure generating unit 100 and a rod-shaped member cutting head unit (hydraulic operation tool) 10 that can be attached to and detached from the hydraulic pressure generating unit 100. FIG. 1 shows a state in which the head unit 10 is mounted on the hydraulic pressure generating unit 100. FIG. 2 shows only the head unit 10 that is removed from the hydraulic pressure generating unit 100 and to which an oil leakage prevention cap is attached.

  The hydraulic pressure generating unit 100 is already known per se, and is a handy rescue system HRS-93 (commercially available from Ogura Co., Ltd.), the assignee (applicant) of the present invention at the time of filing of the present patent application. The product corresponds to the HRS-931 pump unit (product name). Other head units (not described in this specification) such as shear heads and spreader heads constituting the handy rescue system can be attached to the hydraulic pressure generating unit 100. The configuration of the hydraulic pressure generation unit 100 and the connection structure between the hydraulic pressure generation unit 100 and the head unit are also described in Japanese Patent Application Publication No. 2005-201285 and International Publication Pamphlet WO 03/064091. Therefore, the structure of the hydraulic pressure generation unit 100 and the connection structure between the hydraulic pressure generation unit 100 and various head units including the head unit 1 can be easily grasped and actually manufactured by those skilled in the art. It is clear. In the implementation of the present invention, the rod-shaped member cutting device may be configured such that the hydraulic pressure generating unit 100 and the head unit 10 are inseparably integrated, or the hydraulic pressure generating unit 100 and the head unit 10 are connected by a hydraulic hose. May be.

  A known part will be briefly described. When the trigger switch 102 provided on the grip 101 is pulled, the built-in electric motor 103 (not shown in the figure) is operated, whereby the pump 104 is rotated and the hydraulic oil pressurized in the oil passage 105 is discharged. Sent out. The hydraulic oil passes through the oil passage 106 and is sent into a cylinder of the head unit 10 described later, whereby the head unit 10 operates. When the release lever 107 is pulled, the hollow spool valve 108 slides to the right in the drawing, and the oil passage 106 and the oil passage 105 are disconnected, while the oil passage 106 communicates with the oil passage 110 inside the hollow spool valve 108. The hydraulic oil returns from the head unit 10 to the pump 104. When the release lever 107 is not pulled, the oil passage 105 and the oil passage 106 communicate with each other via a groove 111 formed on the outer peripheral surface of the hollow spool valve 108. A battery 112 for driving the electric motor 103 is detachably attached to the lower end of the grip 101.

  Next, the configuration of the head unit 10 will be described with reference to FIGS. The head unit 10 has a base 12 connected to the hydraulic pressure generation unit 100, and a cylinder 14 is provided in the base 12. A piston 16 that can slide in the axial direction is provided in the cylinder 14. The cylinder 14 and the piston 16 constitute a hydraulic cylinder actuator. The pressure chamber 18 defined on the first side of the piston 16 in the cylinder 14 (the hydraulic pressure generating unit 100 side relative to the piston 16) is connected to the hydraulic pressure generating unit 100 when the head unit 10 is connected to the hydraulic pressure generating unit 100. The oil passage 106 is communicated. The piston 16 is urged rightward in the drawing by a return spring 20 provided on the second side of the piston 16. On the second side of the piston 16, a push rod 22 formed integrally with the piston 16 extends in the axial direction of the piston 16. A generally U-shaped pin receiving groove 24 is formed at the tip of the push rod 22.

  The base 12 is provided with a fixed arm (first arm) 26 as a first blade support. The fixed arm 26 may be formed integrally with the base 12 or may be firmly coupled to the base 12. A rotation arm (second arm) 30 as a second blade support is rotatably attached to the fixed arm 26 via a fixing pin 28. In the illustrated embodiment, as is particularly apparent from FIG. 4, the pivot arm 30 has bifurcated end portions 31, 31 on the proximal end side, and the fixed arm 26 is interposed between the end portions 31, 31. Is inserted, and the rotary arm 30 is attached to the fixed arm 26 by bolt / nut coupling. That is, the shaft portion of the bolt forms the fixing pin 28.

  The rotating arm 30 is provided with a slider 32 in the form of a pin that engages in the pin receiving groove 24 of the push rod 22. When the piston 16 moves in the left direction in FIG. 1, the push rod 22 pushes the slider 32, whereby the rotating arm 30 rotates about the fixed pin 28 counterclockwise in the drawing (that is, the rotating arm). 30 and the fixed arm 26 are relatively rotated), and the tip of the rotary arm 30 moves so as to be close to the tip of the fixed arm 26. At this time, the slider 32 slides in the pin receiving groove 24 so as not to hinder the rotating motion of the rotating arm 30 around the fixed pin 28.

  A cutting blade 34 is fixed to each of the fixed arm 26 and the rotating arm 30. The cutting blade 34 can be attached to and detached from the fixed arm 26 and the rotating arm 30. A gripping mechanism 40 for gripping the rod-shaped member B when the rod-shaped member B is cut is provided on both sides of each cutting blade 34. That is, two holding mechanisms 40 are provided on each of the fixed arm 26 and the rotating arm 30.

  The configuration of each gripping mechanism 40 will be described below. Each gripping mechanism 40 includes a plate-shaped gripping member 41 and two elastic bodies 42 that bias the gripping member 41. In the illustrated embodiment, the elastic body 42 comprises a coil spring. Note that the number of elastic bodies 42 provided in one gripping mechanism 40 is preferably two for reasons described later, but is not limited to two and may be one or three or more. Other types of springs can be used as the elastic body 42.

  Each of the fixed arm 26 and the rotating arm 30 is formed with two holding grooves 43 (see FIG. 3 in particular) for receiving and holding the gripping member 41. A long groove 44 for guiding the backward movement of the gripping member 41 (the motion of sinking into the holding groove 43) is formed on the side surface 41 a outside the gripping member 41. The long groove 44 may penetrate the holding member 41. In other words, the long groove 44 may be in the form of a hole. A guide pin 45 provided on the fixed arm 26 (the turning arm 30) is slidably engaged with the long groove 44. In the illustrated embodiment, the guide pin 45 is formed by a distal end portion of a screw shaft screwed to the fixed arm 26 (rotating arm 30). In addition, it replaces with comprising the guide mechanism from the illustrated long groove 44 and the guide pin 45, and the long groove (not shown) provided in the holding member 41 and the long groove (provided in the movable arm 30) ( The guide mechanism can also be configured by (not shown).

  Appropriate irregularities for preventing the rod-like member B from sliding (displacement) are formed on the gripping surface 41 c of the gripping member 41. 2 and 3, the gripping surface 41c is a black square portion.

  The elastic body 42 is interposed between the surface opposite to the gripping surface 41 c of the gripping member 41, that is, between the base surface and the bottom surface of the holding groove 43. In order to stably support the elastic body 42, the base surface of the gripping member 41 is provided with a recess 41d that accommodates the end of the elastic body 42 (see particularly FIG. 1).

  When a load is applied to the gripping surface 41a in the process of cutting the rod-shaped member B, the gripping member 41 is displaced so as to sink into the holding groove 43 while compressing the elastic body 42, and the amount of displacement is increased. Accordingly, a gripping force corresponding to the repulsive force generated by the elastic body 42 is applied to the rod-shaped member B. 1 and 3 show a state in which no load is applied to the gripping surface 41a.

  When the pressurized hydraulic oil is supplied to the pressure chamber 18 and the rotating arm 30 is brought close to the fixed arm 26, first, as shown in FIG. To touch. That is, in the non-operating state, the gripping surface 41c of the gripping member 41 is at a position slightly ahead of the cutting edge 35 of the cutting blade 34 (in other words, the height of the gripping surface 41c of the gripping member 41 is the height of the cutting edge 35). Higher than). When the rotating arm 30 is further rotated, the cutting blade 34 comes into contact with the rod-shaped member B, and then bites into the rod-shaped member B. Along with this, the gripping member 41 is also displaced so as to retreat with respect to the cutting blade 34 while compressing the elastic body 42, whereby the gripping force of the bar-shaped member B by the gripping member 41 increases. Finally, the rod-shaped member B is broken. The state immediately after that is shown in FIG. At this time, each gripping member 41 is displaced by an amount corresponding to the radius of the rod-shaped member B, and the gripping force is sufficiently large, so that the broken pieces of the rod-shaped member B are prevented from scattering. Therefore, a safe cutting operation can be performed.

  2 and 3, particularly, both side surfaces 41a and 41b of the holding member 41 are substantially restrained by the inner wall surface of the holding groove 43, while the front and rear ends of the holding groove 43 are opened. Therefore, the front surface 41e and the rear surface 41f of the grip member 41 are not restrained. Therefore, the gripping member 41 can swing to some extent in the holding groove 43 with the guide pin 44 as a fulcrum. In other words, the gripping member 41 can swing on a plane parallel to the plane on which the cutting edge 35 of the cutting blade 34 moves during the cutting operation. This swingable gripping member 41 provides the following advantages. That is, since the cutting is performed by the relative turning motion of the fixed arm 26 and the rotating arm 30 around the fixed pin 28, a force for rotating the gripping member 41 is surely applied during the cutting. At this time, when the holding member 41 is not swingable as described above (for example, the front and rear ends of the holding groove 43 are not opened, and the front surface 41e and the rear surface 41f of the holding member 41 are restrained by the inner wall surface of the holding groove 43. If the angle of the gripping member 41 is engaged with the holding groove 43, the gripping member 41 may not smoothly sink into the holding groove 43. May cause damage to the gripping mechanism 40. Such a problem is prevented by making the gripping member 41 swingable as described above.

  In the illustrated embodiment, the guide pin 45 serving as the substantial swing center of the gripping member 41 is located between the front elastic body 42 (42a) and the rear elastic body 42 (42b). Yes. For example, when the rod-shaped member B is set in the situation as shown in FIG. 1, the gripping member 41 of the fixed arm 26 and the rotating arm 30 receives a force from the rod-shaped member B that can be rotated counterclockwise in the drawing. However, the elastic member 42 on the rear side in the fixed arm 26 and the elastic member 42 on the front side in the movable arm 30 generate a repulsive force that prevents the counterclockwise rotation, thereby holding the holding member 41. The collapse (rotation) of the surface 41c is minimized. For this reason, the rod-shaped member B can be reliably gripped by the gripping member 41 while securing the advantages of the swingable gripping member 41 described above. In addition, the holding member 41 can reliably hold the rod-like member B having various cross-sectional shapes (round, square, irregular).

  In the above embodiment, a very simple link mechanism in which the members corresponding to the “link pin” are only two of the fixed pin 28 and the slider 32 is used in the above embodiment. Thereby, sufficient reliability and durability as the head unit 10 for cutting a high-strength rod-shaped member to which a large load is applied to the mechanism can be ensured. Further, since a simple link mechanism is used, the entire head unit 10 is relatively light, which is preferable as a handy rescue tool that requires light weight. Further, in the above embodiment, the pivot arm 30 that can rotate about the fixed pin 28 is used. Therefore, when the pivot arm 30 is in the “open” position (position shown in FIG. 1), this rod-shaped member is used. By advancing the entire cutting device toward the rod-shaped member B, the rod-shaped member B can be easily set between the fixed arm 26 and the cutting blade 34 of the rotating arm 30. This is very advantageous for rescue operations requiring extremely quick operations. In other words, the above embodiment is the best embodiment that can be considered at present.

  However, the blade support in the present invention is not limited to the fixed arm 26 and the rotating arm 30 shown in the above embodiment. For example, a pair of movable arms may be used as the blade support. For example, as schematically shown in FIG. 6, a pin 50 is provided at the tip of the push rod 22 extending in the axial direction from the piston 16, and a pair of link arms 51 are pivotally attached to the pin 50, and each link arm 51 is respectively attached. A movable arm 53 is pivotally attached via a pin 52. Then, the movable arm 53 is pivotally attached to the movable arm 53 via a fixed pin 54 which does not move so as to be relatively rotatable. A cutting blade 34 and a gripping mechanism 40 are attached to each movable arm 53. In this case, it will be easier to set the rod-shaped member between the cutting blades. However, since the weight increases due to the use of a complicated link mechanism, it is considered to be less preferable as a handy rescue tool that requires light weight.

  Alternatively, as schematically shown in FIG. 7, a cutting blade 34 and a gripping mechanism 40 are provided directly at the tip of the push rod 22, and a receiving member 55 is fixed to the head unit main body (base). The cutting blade 34 and the gripping mechanism 40 may be provided at 55, and the rod-shaped member may be cut by a linear motion by the piston 16. In this case, the tip of the push rod 22 and the receiving member 55 serve as a blade support. In this case, since the cutting is performed by the relative linear motion of the piston rod 22 as the blade support and the receiving member 55, the necessity of the swinging function of the gripping mechanism 40 is reduced. The rocking function can be abolished. This configuration is advantageous in that it can be made lightweight, but has the disadvantage that it is difficult to set a rod-shaped member between cutting blades, and is not very preferable for the use of a rescue tool that requires quick work. Conceivable.

14, 16 Hydraulic cylinder actuator 26 Tool support (fixed arm)
28 pins 30 Blade support (movable arm)
34 Cutting blade 40 Grip mechanism 41 Grip member 41c Grip surface 42 Elastic body 44 Guide groove 45 Guide pin

Claims (4)

It has a pair of blade supports that can be operated so as to be relatively close to each other, and is configured to cut the rod-shaped member by bringing the cutting blades provided on the respective blade supports into contact or close to each other. In the rod-shaped member cutting device,
A gripping mechanism for gripping the rod-shaped member is provided on both sides of the cutting blade of each blade support.
Each gripping mechanism is
A gripping surface that grips the rod-shaped member, and a grip attached to the blade support so that the gripping surface can be displaced so as to move backward with respect to the cutting blade by being pushed by the rod-shaped member. Members,
Elasticity that is interposed between the blade support and the gripping member, generates a repulsive force that resists displacement of the gripping member, and causes the gripping member to grip the rod-shaped member with a gripping force according to the repulsive force Body,
Have
The gripping mechanism is configured such that, in the process in which the pair of blade supports are relatively close to each other, the gripping member first contacts the rod-shaped member, and then the cutting blade contacts the rod-shaped member. A rod-shaped member cutting device. The pair of blade supports are connected via pins so that the pair of blade supports are relatively rotatable.
The gripping member of each gripping mechanism supports the blade so that it can swing in a plane parallel to a plane on which the cutting blade moves when the pair of blade supports are relatively close to each other. The rod-shaped member cutting device according to claim 1, wherein the rod-shaped member cutting device is attached to a body. Each of the gripping mechanisms has two elastic bodies between the blade support and the gripping member,
The gripping member is attached to the blade support in a region between the two elastic bodies via a guide mechanism comprising a combination of a guide groove and a guide pin configured to allow the swinging motion of the gripping member. The rod-shaped member cutting device according to claim 2, wherein the rod-shaped member cutting device is attached.   The pair of blade support members includes an immovable fixed arm and a rotating arm that is rotatably connected to the fixed arm via a pin and is driven by a hydraulic cylinder actuator. Item 4. The bar-shaped member cutting device according to any one of Items 1 to 3.

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