Adapter for flag-shaped wrench

Abstract

To provide an adapter for flag-shaped wrench that can give torque limiter function to a small flag-shaped wrench.SOLUTION: An adapter 1 for flag-shaped wrench, which is attached to a flag-shaped wrench 90 having a flag part 93 on a base end side of a shank 91, comprises, on one side in a longer direction of a handle 20 which is gripped and rotationally operated by an operator, a holding part 22 through which the shank 91 of the flag-shaped wrench 90 is inserted and which holds the same, and an action member 60 which contacts the flag part 93 of the flag-shaped wrench 90 held by the holding part 22, and applies an operation force of rotational movement to the flag part 93. The handle 20 and the action member 60 are connected via a torque limiter mechanism.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a flag wrench adapter that is attached to a flag wrench. [Background technology]

[0002] BACKGROUND ART Conventionally, small flag-shaped wrenches equipped with a resin flag portion, as described in Patent Document 1, have been widely used for attaching and detaching throw-away tips of cutting tools.

[0003] However, when attaching a throw-away insert to a holder, if the tightening torque used to tighten the screw is too great, the insert may become distorted or the screw may break. Conversely, if the tightening torque is too small, the screw may come loose and the insert may not be securely fastened. Therefore, in order to accurately attach the insert to the holder, it is important to tighten the screw with the appropriate tightening torque.

[0004] To address this problem, the applicant has proposed a torque wrench equipped with a torque limiter mechanism inside a flag-shaped handle, as described in Patent Document 2. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-285275 [Patent Document 2] Japanese Patent Application Publication No. 2023-19287 Summary of the Invention [Problem to be solved by the invention]

[0006] However, since the torque wrench of Patent Document 2 integrates the handle and the wrench, it is impossible to add a torque limiter function to a general flag wrench as described in Patent Document 1 by retrofitting. Therefore, for users who use a flag wrench, torque management in chip replacement work and the like has still been difficult.

[0007] An object of the present invention is to provide an adapter for a flag wrench that can solve the above-described conventional problems and can impart a torque limiter function to a small flag wrench.

Means for Solving the Problems

[0008] In order to solve the above problems, an adapter for a flag wrench that is attached to a flag wrench having a flag portion on the proximal end side of a shaft portion, and on one side in the longitudinal direction of a handle that is gripped and rotated by an operator, a holding portion that inserts and holds the shaft portion of the flag wrench, and an acting member that abuts against the flag portion of the flag wrench held by the holding portion and applies the operating force of the rotation operation to the flag portion, and the adapter for a flag wrench is characterized in that the handle and the acting member are connected via a torque limiter mechanism.

[0009] Further, the torque limiter mechanism preferably includes a spherical member urged by a spring on the handle side and a ball receiving member on the acting member side having an engagement recess into which the spherical member fits, and when the tightening torque due to the rotation operation of the handle reaches a predetermined value, the engagement between the spherical member and the engagement recess is disengaged and a non-transmission state is achieved in which the operating force is not transmitted to the acting member.

[0010] Further, it is preferable that the adapter for a flag wrench includes a torque adjustment mechanism for adjusting the spring pressure of the spring that urges the spherical member.

Effects of the Invention

[0011] In the present invention, it is possible to provide an adapter for a flag wrench that can impart a torque limiter function to a small flag wrench.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0013] Embodiments for carrying out the invention are shown below. As shown in FIG. 1, the adapter 1 for a flag wrench according to the embodiment is attached to and used with a flag wrench 90. In this specification, in the attached state to the flag wrench 90 shown in FIG. 1, the side where the shaft portion 91 of the flag wrench 90 is located is defined as the lower side of the adapter 1 for a flag wrench, and the opposite side is defined as the upper side.

[0014] (Flag wrench) As shown in FIGS. 1 to 3, a flag wrench 90 to which the flag wrench adapter 1 according to the embodiment is attached includes a shaft portion 91 having an engaging portion 92 formed at the tip thereof that can engage with a fastening member, and a flag portion 93 provided on the base end side of the shaft portion 91. The flag portion 93 of the embodiment is made of synthetic resin, has a size that can be grasped and operated by an operator's finger, and is formed in a plate shape that is substantially rectangular when viewed from the front. The material and shape of the flag portion 93 are not limited to this.

[0015] (Flag Wrench Adapter) As shown in FIGS. 1 and 2, the flag wrench adapter 1 includes a handle 20 that is held and rotated by an operator, and on one side in the longitudinal direction of the handle 20, there is a holding portion 22 that inserts and holds the shaft portion 91 of the flag wrench 90, and an acting member 60 that abuts against the flag portion 93 of the flag wrench 90 held by the holding portion 22 and applies the operating force of the rotational operation of the handle 20 to the flag portion 93.

[0016] The handle 20 and the acting member 60 are connected via a torque limiter mechanism described later. Thus, in the present invention, it is possible to provide a flag wrench adapter 1 that can impart a torque limiter function to a small flag wrench 90.

[0017] (Handle) As shown in FIGS. 1 and 3, the handle 20 of the embodiment is formed in a substantially rectangular parallelepiped shape that is horizontally long when viewed from the front as a whole. In the embodiment, the flag wrench 90 is held on one side in the longitudinal direction of the handle 20. In this specification, one side in the longitudinal direction of the handle 20 of the embodiment on which the flag wrench 90 is held is defined as the attachment side of the handle 20, and the opposite side of the attachment side is defined as the operation side of the handle 20.

[0018] (Holding Portion) As shown in FIGS. 1 to 3, on the attachment side surface 21 of the handle 20, there is provided a holding portion 22 through which the shaft portion 91 is inserted and the flag wrench 90 is held. The holding portion 22 of the embodiment includes a first support portion 23 provided at the lower end side of the attachment side surface 21, and a second support portion 25 provided at an interval above the first support portion 23.

[0019] As shown in FIG. 3, the first support portion 23 of the embodiment is in the shape of a rectangular plate in plan view and is formed to extend in the longitudinal direction of the handle 20. A through hole 24 is formed in a substantially central portion of the first support portion 23. A stepped portion (not shown) is provided on the lower end side of the inner peripheral surface of the through hole 24. One of the two bearing members 27 shown in FIG. 3 is inserted into the through hole 24 and placed on the stepped portion.

[0020] The second support portion 25 of the embodiment is in the shape of a substantially semicircular plate in plan view and is formed at substantially the center of the mounting side surface 21 so as to extend in the longitudinal direction of the handle 20. A through hole 26 is formed in a substantially central portion of the second support portion 25. In the embodiment, one of the two bearing members 27 shown in FIG. 3 is housed inside the through hole 26 after being mounted on the shaft portion 91.

[0021] As shown in FIG. 3, the through hole 24 of the first support portion 23 and the through hole 26 of the second support portion 25 are coaxial with each other. The shaft portion 91 is inserted through the bearing member 27 with respect to these through holes 24 and 26, whereby the flag wrench 90 is held by the handle 20. The rotational axis direction of the shaft portion 91 held by the holding portion 22 and the longitudinal direction of the handle 20 are substantially orthogonal.

[0022] Note that between the first support portion 23 and the second support portion 25 in the embodiment, a mounting piece 62 of the acting member 60 and a ball receiving member 50 constituting a torque limiter mechanism are arranged (the acting member 60 and the ball receiving member 50 will be described in detail later). The mounting piece 62 and the ball receiving member 50 of the embodiment are each provided with an insertion hole through which the shaft portion 91 is inserted, and these insertion holes and the through holes 24 and 26 are arranged to be coaxial with each other.

[0023] In the mounted state shown in FIG. 4, the shaft portion 91 of the flag-shaped wrench 90 passes through the holding portion 22 constituted by the first support portion 23 and the second support portion 25, the mounting piece 62 disposed on the holding portion 22, and the ball receiving member 50 (see FIGS. 3 and 4). Thus, in the embodiment, the ball receiving member 50 and the acting member 60 are held by inserting the shaft portion 91 through the holding portion 22.

[0024] (Acting member) As shown in FIGS. 2 to 4, the acting member 60 of the embodiment is a block-shaped member that is substantially L-shaped in side view, and is disposed at a position facing the handle 20 with the flag-shaped wrench 90 interposed therebetween.

[0025] In the acting member 60 of the embodiment, the upper L-shaped portion serves as an acting portion 61 that abuts against the flag portion 93. The acting portion 61 abuts against the gripping surface of the flag portion 93 of the flag-shaped wrench 90 held on one side of the handle 20, and causes the operating force received by the handle 20 to act on the flag portion 93. In the embodiment, the acting portion 61 and the gripping surface of the flag portion 93 are in planar contact. With such a configuration, stress concentration can be avoided and damage to the flag portion 93 can be suppressed.

[0026] Note that FIG. 4 shows a state in which the operating force applied to the handle 20 can be transmitted to the flag portion 93. In the transmissible state, the contact surface of the acting portion 61 with the flag portion 93 extends substantially parallel to the longitudinal direction of the handle 20.

[0027] The acting member 60 of the embodiment includes a mounting piece 62 attached to the handle 20 on the lower end side of the surface facing the handle 20 (see FIGS. 3 and 4). The mounting piece 62 of the embodiment has an L shape, and an insertion hole 63 through which the shaft portion 91 can be inserted is formed in the lower arm of the L shape. A ball receiving member 50 described later is placed on the mounting piece 62, and the upper arm of the L shape of the mounting piece 62 serves as a connecting surface 64 that abuts against the side surface of the ball receiving member 50 (see FIG. 4). The mounting piece 62 and the ball receiving member 50 are placed on the first support portion 23 of the handle 20.

[0028] When the shaft portion 91 is inserted into the insertion hole 63 of the mounting piece 62 placed on the first support portion 23, the operating member 60 can rotate about the shaft portion 91 with respect to the handle 20.

[0029] Further, on the lower inner side of the operating member 60 of the embodiment, a screw hole 65 that opens to the side surface opposite to the mounting piece 62 is provided. The screw hole 65 communicates orthogonally with the insertion hole 63 of the mounting piece 62 (see FIG. 4).

[0030] In the embodiment, a screw member 66 that prevents the flag wrench 90 from falling off is engaged with the screw hole 65 (see FIGS. 3 and 4). By tightening the screw member 66 and abutting it against the shaft portion 91 in the insertion hole 63, the shaft portion 91 is fixed from the lateral direction, and the fastening operation of the flag wrench 90 can be performed stably.

[0031] (Torque limiter mechanism) In the present invention, the handle 20 and the operating member 60 are connected via a torque limiter mechanism. As shown in FIG. 5, the torque limiter mechanism of the embodiment includes a spring 30 built into the handle 20, a pin 31 engaged with an end portion of the spring 30, a ball 40 which is a spherical member biased by the spring 30 via the pin 31, and a ball receiving member 50 having an engaging recess 51 into which the ball 40 is detachably fitted.

[0032] Here, the internal structure of the handle 20 of the embodiment will be described. On the mounting side surface 21 of the handle 20 of the embodiment, a holding hole 28 for holding the ball 40 is opened at a position between the first support portion 23 and the second support portion 25 (see FIGS. 3 and 5).

[0033] As shown in FIGS. 4 and 5, a hollow accommodating portion 29 is provided inside the handle 20 of the embodiment. The accommodating portion 29 of the embodiment has a substantially cylindrical shape formed with three different diameters as shown in FIG. 5. The accommodating portion 29 communicates with the holding hole 28 on the mounting side and opens to the side surface on the operating side. Further, a female screw is formed in the operating side portion of the accommodating portion 29.

[0034] In the housing portion 29 of the embodiment, a spring 30 that biases the ball 40, a pin 31 provided at one end of the spring 30, and a part of a spring pressure adjusting member 70 that adjusts the spring pressure of the spring 30 are accommodated.

[0035] (Spring) The spring 30 of the embodiment is a compression spring accommodated in the housing portion 29 of the handle 20. In the embodiment, as shown in FIG. 5, a pin 31 is disposed at the mounting side end of the spring 30, and the ball 40 is pressed via the pin 31.

[0036] A spring pressure adjusting member 70 is provided at the operating side end of the spring 30 of the embodiment. The spring pressure adjusting member 70 of the embodiment is a headless bolt having a male thread formed on its outer periphery. The spring pressure adjusting member 70 of the embodiment engages with an internal thread formed in the housing portion 29 of the handle 20 and is prevented from coming off by a nut 80.

[0037] A part of the spring pressure adjusting member 70 is exposed to the outside from the operating side of the handle 20, and a hexagonal hole 71 is formed in the exposed end portion. By moving the spring pressure adjusting member 70 forward or backward from the outside of the handle 20, the spring pressure of the spring 30 can be adjusted.

[0038] (Ball) The ball 40 of the embodiment is a steel ball. The ball 40 is disposed inside a holding hole 28 formed in the mounting side surface 21 of the handle 20 as shown in FIG. 5. The ball 40 of the embodiment is held inside the holding hole 28 via a cylindrical ball guide 41.

[0039] The inner diameter of the ball guide 41 is slightly larger than the outer diameter of the ball 40, and the ball 40 is slidably accommodated in the ball guide 41 (see FIGS. 3 and 5). Further, the length of the ball guide 41 is smaller than the diameter of the ball 40. The ball 40 disposed in the holding hole 28 via the ball guide 41 is biased by a spring 30 built in the handle 20, and a part of the ball 40 protrudes outward from the mounting side surface 21 which is one end surface of the mounting side of the handle 20. The ball 40 biased outward by the spring 30 is pressed against the ball receiving member 50.

[0040] (Ball receiving member) As shown in FIG. 3, the ball receiving member 50 is generally cylindrical in shape and has an insertion hole 52 through which the shaft portion 91 can be inserted at the center. The ball receiving member 50 of the embodiment is made of steel. It is preferable to make the ball receiving member 50 of a hard metal such as steel because it is resistant to wear.

[0041] As shown in FIGS. 5 and 6, an engaging recess 51 into which the ball 40 can be fitted and a notch end face 53 serving as a contact surface with the actuating member 60 are formed on the outer peripheral surface of the ball receiving member 50 of the embodiment.

[0042] The engaging recess 51 of the embodiment is a concave groove (R groove) notched in an arc shape along the outer peripheral surface of the ball 40. When the torque limiter shown in FIG. 5 is not operating (in a transmissible state), the ball 40 is fitted in the engaging recess 51 of the ball receiving member 50.

[0043] Note that the shape of the engaging recess 51 is not limited to this, and any shape is acceptable as long as the ball 40 can be fitted and engaged, and the engaged state is released when a predetermined torque acts on the ball 40.

[0044] As shown in FIGS. 5 and 6, the notch end face 53 of the embodiment is an end face obtained by notching a part of the outer peripheral surface of the ball receiving member 50 in a direction parallel to the rotation axis of the shaft portion 91 inserted through the insertion hole 52, and is formed in a substantially rectangular shape in side view. The engaging recess 51 and the notch end face 53 of the embodiment are formed at positions facing each other with the insertion hole 52 interposed therebetween.

[0045] As described above, the ball receiving member 50 of the embodiment is placed on the mounting piece 62 of the actuating member 60 and is disposed between the first support portion 23 and the second support portion 25 together with the mounting piece 62 (see FIG. 4). In this state, the shaft portion 91 is inserted through the insertion hole 52.

[0046] Note that, as shown in Fig. 5, the ball receiving member 50 and the acting member 60 of the embodiment are fixed to each other in a state where the engaging recess 51 and the ball 40 are engaged and the notch end face 53 and the connection surface 64 are in planar contact. Thus, in the embodiment, the ball receiving member 50 and the acting member 60 can rotate integrally about the shaft portion 91.

[0047] Next, the operation of the torque limiter mechanism of the embodiment will be described. As shown in Fig. 4, the user attaches the flag wrench adapter 1 to the flag wrench 90, engages the engaging portion 92 at the tip of the shaft portion 91 with the fastening member, and holds the handle 20 with the fingertips and rotates it in the tightening direction.

[0048] When the handle 20 rotates about the shaft portion 91, as shown in Fig. 7(a), the ball receiving member 50 engaged with the ball 40 rotates integrally with the handle 20. As the ball receiving member 50 rotates, the acting member 60 also rotates integrally. When the acting member 60 rotates, the flag portion 93 is pushed by the acting portion 61 (see Fig. 4), the flag portion 93 rotates in the tightening direction, and the fastening member is fastened. In this way, the operating force applied to the handle 20 is transmitted to the flag portion 93 via the ball receiving member 50 and the acting member 60.

[0049] When the tightening torque of the fastening member reaches a predetermined value, the ball 40 retracts inward of the ball guide 41 against the biasing force of the spring 30. When the ball 40 retracts, the engagement between the ball 40 and the engaging recess 51 is disengaged, as shown in Fig. 7(b).

[0050] When the engagement state between the ball 40 and the engaging recess 51 is released, torque is no longer transmitted from the handle 20 to the acting member 60, and a non-transmission state occurs where the operating force applied to the handle

END

[0051] In this way, if the handle 20 and the acting member 60 are connected via the torque limiter mechanism, the transmission path of the operating force can be blocked when the tightening torque reaches a predetermined value, so that an excessive load is prevented from being applied to the fastening member, and the fastening operation can be performed with an appropriate torque.

[0052] In the embodiment, when the engagement between the ball 40 and the ball receiving member 50 is disengaged, the torque at that time is measured with a torque checker or the like, and the spring pressure of the spring 30 is adjusted using the spring pressure adjusting member 70. Thereby, the pressure with which the ball 40 is pressed against the engagement recess 51 can be adjusted, and the tightening torque can be appropriately controlled.

[0053] Note that, in the embodiment, as described above, the ball receiving member 50 and the operating member 60 can rotate integrally with respect to the handle 20. With such a configuration, as shown in FIGS. 7(b) and 8, when the torque limiter operates and the torque is in a non-transmission state, the handle 20 moves to a position obliquely displaced with respect to the ball receiving member 50 and the operating member 60, so that it can be immediately understood that the tightening torque has reached a predetermined value.

[0054] In a conventional torque wrench, there are some that make a clicking sound, a buzzer sound, or a lamp lights up when a specified torque is reached to notify that the predetermined value of the torque has been reached. However, if the work place is noisy or the visibility at hand is poor, it may be difficult to tell that the screwing has been completed. Also, in the case of a non-idling type torque wrench, if tightening continues without noticing that the torque has reached a predetermined value, over-tightening will occur. The flag-shaped wrench adapter 1 of the embodiment can surely suppress over-torque with a simple structure.

[0055] Further, in the torque limiter mechanism of the embodiment, there is one engagement recess 51 in the ball receiving member 50, and the ball 40 that has escaped from the engagement recess 51 relatively moves along the curved surface on the outer periphery of the ball receiving member 50. For this reason, the idling operation of the handle 20 becomes large, and the operator can easily sense the sense of disengagement in the non-transmission state. Therefore, with the flag-shaped wrench adapter 1 of the embodiment, even in a working environment with poor visibility at hand, over-torque can be more surely suppressed.

[0056] In addition, in the adapter 1 for the flag wrench of the embodiment, since the long handle 20 is operated to fasten the screw, the screw can be easily turned with a small force, and the working efficiency can be improved compared to the case where the flag wrench 90 is used alone.

[0057] As described above, the present invention has been described by taking the embodiment as an example. However, the present invention is not limited to the above embodiment and can be in various forms. For example, the shape of the spherical member is not limited to a sphere, and it may be a shape having a spherical surface at the tip of the cylindrical portion.

Explanation of Reference Numerals

[0058] 1 Adapter for flag wrench 20 Handle 21 Mounting side surface 22 Holding portion 23 First support portion 24 Through hole 25 Second support portion 26 Through hole 27 Bearing member 28 Holding hole 29 Accommodating portion 30 Spring 31 Pin 40 Ball 41 Ball guide 50 Ball receiving member 51 Engaging concave portion 52 Insertion hole 53 Notch end face 60 Actuating member 61 Actuating portion 62 Mounting piece 63 Insertion hole 64 Connection surface 65 Screw hole 66 Screw member 70 Spring pressure adjusting member 71 Hexagonal hole 80 Nut 90 Flag wrench 91 Shaft portion 92 Engaging portion 93 Flag portion

Claims

1. A wrench adapter for a flag wrench having a flag portion on the proximal end side of a shaft portion, comprising: On one side in the longitudinal direction of a handle that is gripped and rotated by an operator, A holding portion that inserts and holds the shaft portion of the flag wrench; An acting member that abuts against the flag portion of the flag wrench held by the holding portion and applies the operating force of the rotation operation to the flag portion; and A wrench adapter for a flag wrench, wherein the handle and the acting member are connected via a torque limiter mechanism.

2. The torque limiter mechanism includes: A spherical member biased by a spring on the handle side; and A ball receiving member on the acting member side having an engagement recess into which the spherical member fits, The wrench adapter for a flag wrench according to claim 1, wherein when the tightening torque due to the rotation operation of the handle reaches a predetermined value, the engagement between the spherical member and the engagement recess is disengaged, and the operating force is not transmitted to the acting member, resulting in a non-transmission state.

3. The wrench adapter for a flag wrench according to claim 1 or 2, further comprising a torque adjustment mechanism for adjusting the spring pressure of the spring that biases the spherical member.

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