JPH0580681U - Work tools - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent excessive tightening torque when tightening the chip clamp screw with a work tool. [Structure] A rod-shaped grip portion 13 is provided at a base end portion of an axial tool body 11 in a direction orthogonal to an axis O thereof. The central portion of the grip portion 13 is formed such that a portion within a range separated from the axis O by a distance L set according to an appropriate tightening torque has a smaller outer diameter than the other portions. In addition, the fastening finger hook portion 14 is formed. Further, the holding portion 13 displays the appropriate magnitude of the tightening torque. [Effect] At the time of tightening, the operator naturally grips the finger-holding portion for tightening 14 to take an appropriate gripping method, thereby preventing generation of excessive tightening torque, and thereby the chip clamp screw. It is possible to prevent damage or deformation such as.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a working tool such as a wrench used for tightening or loosening a tip clamp screw when a tip of a throw-away type cutting tool is attached and detached.

[0002]

[Prior Art]

 As an example of such a working tool, for example, a wrench as shown in FIG. 3 is known. This is composed of a shaft-shaped tool body 1 made of steel or the like, and a rod-shaped grip portion 2 made of hard resin or the like and integrally provided on the base end of the tool body 1 and having a smooth outer surface. The center of the grip portion 2 in the longitudinal direction is located on the axis O of the tool body 1 and is arranged in a direction orthogonal to the axis O. As a whole, the grip portion 2 has a T-shape in a side view. Presents. Further, at the tip of the tool body 1, there is formed an engaging portion 3 capable of engaging with a Torx hole or the like formed in the head of the tip clamp screw.

By the way, when tightening the above-mentioned tip clamp screw with such a wrench, in order to prevent damage to the tip clamp screw, the wedge member, or the chip itself due to over-tightening, a cutting tool is usually used. According to the specified tightening torque. On the other hand, when loosening the tip clamp screw, a large rotation torque is required especially at the beginning of the loosening, so that the grip portion 2 of such a wrench has a length corresponding to the required rotation torque when loosening the chip clamp screw. Since it is set, therefore, an excessive torque more than the tightening torque will be generated by simply grasping the whole of the grip portion 2 in a casual manner. Therefore, when using such a wrench, an appropriate torque should be generated by changing the gripping method or the force application method when the tip clamp screw is tightened or loosened. It was

FIG. 4 and FIG. 5 show an example of how to grip at the time of such tightening and how to tighten the tip clamp screw of the throw-away cutting tool by this grip. In this example, the thumb and forefinger sandwich the vicinity of the central part of the grip portion 2, and the middle finger is applied to this to hold the wrench. Of these, the thumb and the forefinger are mainly used to generate a rotation torque. It has become. In such a gripping method, since a force is applied to the central portion of the gripping portion 2 which is located at a small distance from the axis O of the tool body 1, the torque generated is smaller than that in the case of gripping the gripping portion 2 as a whole, and an average value is obtained. When an operator having a large arm strength grips in such a manner, a torque substantially equal to the above-mentioned specified tightening torque is generated.

FIG. 6 shows another example of how to grip when tightening. In this example, the index finger and the middle finger are attached to the central portion of the grip portion 2, and the grip portion is held by this and the thumb. It is a gripping method in which the wrench is held by sandwiching 2 and further applying the ring finger. Even with this gripping method, a force is applied only to the central portion of the beam gripping portion 2, so that it is possible to prevent the generation of torque above the specified tightening torque. FIG. 7 shows the gripping method when the tip clamp screw is loosened, which is the gripping method of gripping the entire grip 2 with all five fingers. A force is also applied to both ends that are far from the axis, so that a large torque can be generated, and the tightened tip clamp screw can be easily loosened and removed.

[0006]

[Problems to be solved by the device]

 However, with the above wrench, the grip shown in FIG. 7 can hold the grip portion 2 more firmly than the grip shown in FIG. 4 and FIG. 6, so that the grip is easier to grip, and therefore the tightening should be done with caution. At that time, he wins because he grips as shown in FIG. This is especially true for cutting tools such as throw-away face milling cutters that have a large number of inserts, and therefore a large number of insert and remove clamp screws, among the above-mentioned inserts. It is often seen on occasions, and even when it is an urgent task, even a skilled worker may use such a gripping method. Therefore, with a conventional wrench, excessive tightening torque may be applied to the tip clamp screw, which causes excessive force on the tip clamp screw, the wedge member, or the tip itself, causing damage or deformation. There was a risk that it would end up.

[0007]

[Means for Solving the Problems]

 The present invention has been made to solve such a problem, and has a shaft-shaped tool body having an engaging portion formed at the tip, and an axis line of the tool body provided at the base end of the tool body. And a grip portion extending in a direction orthogonal to the direction, and the grip portion is provided at a central portion of the grip portion at a portion within a distance range from the axis depending on a tightening torque to be generated by the work tool. It is characterized in that a finger hook portion for tightening having a thickness different from that of other portions is formed.

[0008]

[Action]

 According to such a work tool, the gripping portion is grasped at a distance range from the tool body axis line according to the tightening torque at the center of the gripping portion, specifically, at a position where a finger is caught in a preferable gripping manner which should be gripped at the time of tightening. Since the finger-holding portion for tightening having a thickness different from that of the other parts of the portion is formed, the operator can confirm the proper finger-hanging position by the tactile sensation during tightening. Therefore, the operator naturally grips as shown in FIG. 4 and FIG. 6 without any particular care when tightening, which results in excessive tightening torque during tightening. It is possible to prevent the tip clamp screw from being caught.

The tightening finger hook portion may be formed over the entire distance range described above, or may be formed only at the finger hook position. Further, in the work tool having such a configuration, by displaying the magnitude of the tightening torque generated when the work finger is rotated by gripping the above-mentioned finger grip portion for gripping. , It becomes possible to easily confirm whether or not the work tool is suitable for tightening the tip clamp screw. In addition to this, it is possible to further draw the operator's attention by showing an appropriate way of gripping the finger-holding portion for tightening on the grip portion.

[0010]

【Example】

 FIG. 1 shows a wrench which is an embodiment of the present invention. Also in this embodiment, the tool body 11 is made of steel or the like and has a shaft shape, and an engaging portion 12 capable of engaging with a Torx hole or the like formed in the head portion of the Torx screw is formed at the tip thereof. ing. Further, at the base end of the tool body 1, there is provided a grip portion 13 made of a hard resin or the like and having a substantially round bar shape, with the center in the longitudinal direction thereof being located on the axis O, and with respect to the axis of the tool body 11. The gripping portions 13 are integrally provided in a direction orthogonal to each other, whereby the gripping portions 13 are formed so as to extend to both sides of the tool main body 1, and the entire lench has a T-shape in a side view. ing. In the present embodiment, the central portion of the grip portion 13 is formed such that the portion within a range separated from the axis O by a predetermined distance L 2 has a smaller outer diameter than the other portions. The finger hook portion 14 for tightening in this embodiment is formed.

Here, the distance L from the axis O where the finger-holding portion 14 for tightening is formed is generated when the tip clamp screw is tightened by the wrench with reference to an operator having general arm strength. The tightening torque is set according to the tightening torque to be set, and in this embodiment, the tightening torque is set to 70 to 80 kg · cm. Further, the tightening finger hook portion 14 is displayed with the tightening torque of "70 to 80 kg.cm" by markings, convex characters, or the like.

According to the wrench having such a configuration, the outer diameter of the tightening finger hook portion 14 is formed to be smaller than that of the other portion of the grip portion 13, so that the operator can confirm the position by touch. As a result, when the tip clamp screw is tightened, the finger is unintentionally and naturally brought into contact with the finger-holding portion 14 for tightening, and the grip is performed as shown in FIG. 4 or FIG. For this reason, it is possible to prevent excessive tightening torque from acting on the tip clamp screw during tightening, which may damage or deform the tip clamp screw, the wedge member, or the tip itself. Can be prevented, and the life of these members can be extended. On the other hand, when loosening the tip clamp screw, especially when a large torque is required at the beginning of loosening, it is possible to grip as shown in Fig. 7 above. It is possible to loosen the screws easily, which has the advantage of improving work efficiency when exchanging tips.

Further, in this embodiment, the tightening torque generated when the tightening finger hook 14 is gripped and the wrench is rotated is displayed on the tightening finger hook 14. Therefore, it is possible to easily confirm whether or not the wrench is a work tool suitable for tightening the tip clamp screw, and it is possible to call the operator's attention. In this embodiment, only the tightening torque is displayed on the tightening finger hook portion 14. However, in addition to this, or alone, the tightening torque as shown in FIGS. By displaying the gripping method of the wrench, it is possible to call the operator's attention further, and it is possible to more surely prevent overtightening. Further, the tightening finger hook portion 14 may be colored with a color different from that of the grip portion 13.

In this embodiment, the entire range of the distance L from the axis O of the tool body 11 of the gripping portion 13 is reduced by one step to be the tightening finger hook portion 14. As shown in 2, only the position where the thumb, the index finger, the middle finger, or the like is hooked may be recessed by one step from the other portions and used as the tightening finger hook portion 15. Even with such a configuration, the operator can naturally check the position of the finger-holding portions 15 for tightening by touch, and naturally adopt the gripping method as shown in FIG. 4 or 6. It is possible to obtain the same effect as that of the above embodiment. Also in this embodiment, the tightening torque and the gripping method are displayed on the gripping portion 13 and the tightening finger-holding portions 15 ... Are colored to call the operator's further attention.

[0015]

[Effect of the device]

 As described above, according to the present invention, in the central part of the gripping part, the thickness range is different from the other part in the range of the distance from the tool body axis line according to the tightening torque to be generated by the work tool. Since different tightening finger hooks are formed, the worker naturally puts his fingers on the tightening finger hooks when tightening. This makes it possible to prevent excessive torque from being applied to the tip clamp screw and the like, and prevent the tip clamp screw, the wedge member, or the tip itself from being damaged.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention, (b)
It is a front view from the front end side of the tool body 11.

FIG. 2 is a side view showing another embodiment of the present invention,
(B) It is a front view of the tool body 11 from the front end side.

3A is a side view showing an example of a wrench that is a conventional work tool, and FIG. 3B is a front view from the tip side of the tool body 1.

FIG. 4 is a diagram showing an example of a proper gripping method when tightening a tip clamp screw or the like with the wrench shown in FIG.

FIG. 5 is a diagram for tightening the tip clamp screw of the throw-away cutting tool by the gripping method shown in FIG.

6A and 6B are (A) a palm side view and (B) a back side view showing another example of a proper gripping method when tightening a tip clamp screw or the like with the wrench shown in FIG.

7 is a diagram showing an example of an appropriate gripping method when loosening a tip clamp screw or the like with the wrench shown in FIG.

[Explanation of symbols]

1, 11 Tool body 2, 13 Grip portion 3, 12 Engagement portion 14, 15 Tightening finger hook O O Tool body 1, 11 axis L Tool body 1 according to the tightening torque to be generated by the wrench , 11 distance from axis O

Claims (3)

[Scope of utility model registration request] 1. A shaft-shaped tool body having an engaging portion formed at a tip thereof, and a grip portion provided at a base end portion of the tool body and extending in a direction orthogonal to an axial direction of the tool body, At the center of the gripping portion, a tightening finger having a thickness different from that of the other portion of the gripping portion is provided in a portion in a range of the distance from the axis according to the tightening torque to be generated by the work tool. A work tool characterized in that a hook is formed. 2. The magnitude of the tightening torque generated when the work tool is rotated by gripping the tightening finger hook is displayed on the grip. The working tool according to claim 1. 3. The work tool according to claim 1, wherein the gripping portion illustrates how to grip the finger grip portion for tightening when the tightening torque is generated. .