JPH0720263U - Hook spanner - Google Patents

Abstract

(57) [Summary] [Purpose] To be able to tighten with an appropriate tightening torque so that the tightening torque for the object to be tightened does not become excessive. A hook 11 including a hook portion 11a and a hook handle portion 11b and a spanner main body 12 into which the hook handle portion 11b of the hook 11 is inserted are provided, and the hook handle portion 11b is pivotally supported by the spanner main body 12. , The hook 11 is the wrench body 1
2 is swingable downward about a coaxial line A with the pivot shaft 20. An arcuate cam surface 13a is provided at the rear end of the hook handle 11b, and the spanner body 12 is correspondingly provided. The inside of the hook is urged by the spring 15 to engage with the arcuate cam surface 13a, and normally the hook 11 and the wrench body 12 are substantially coaxial with each other.
An engagement roller 23 is provided to maintain the upper position.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hook spanner that can be tightened with an appropriate tightening torque so that the tightening torque for an object to be tightened does not become excessive.

[0002]

[Prior art]

 For example, in the case of a small diameter small collet chuck as shown in FIG. 5, after inserting the shank portion of the tool 5 into the through hole 4 of the collet 3 fitted in the taper hole 2 of the chuck body 1, the tip male screw of the chuck body 1 is inserted. By engaging the hook portion 8a of the spanner 8 with the hooking groove 7a of the tightening nut 7 that is screwed into the portion 6, and rotating the spanner 8 to tighten the tightening nut 7, the rolling roller 9 and the tightening ring The inclined end surface 3a of the collet 3 is pressed via 10 so that the collet 3 is pressed against the tapered hole 2 to reduce its diameter, and the tool is chucked.

When the tightening nut 7 is tightened by the conventional spanner 8, the tightening torque depends on the intuition of the worker.

[0004]

[Problems to be solved by the device]

 In the above-mentioned conventional spanner 8, since the adjustment of the tightening torque depends on the intuition of the worker, the tightening torque is too small, and the chucking of the tool 5 is insufficient. On the contrary, the tightening torque is large. After passing, the collet 3 is firmly adhered to the tapered hole 2, and when the tightening of the tightening nut 7 is loosened and the collet 3 is pulled out from the tapered hole 2, excessive pulling force is concentrated on the thin portion of the collet 3 or the tightening nut 7. As a result, in a small-diameter small-sized collet chuck generally called a mini chuck, as shown in FIG. 5, cracks A and B may occur in the thin portions of the collet 3 and the tightening nut 7.

In view of the above conventional problems, the present invention provides a hook spanner that can be tightened with an appropriate tightening torque so that the tightening torque does not become excessive with respect to an object to be tightened such as a collet chuck. It is an object.

[0006]

[Means for Solving the Problems]

 The structure of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. The present invention has a hook 11 including a hook portion 11a and a hook handle portion 11b extending straight from a rear end thereof. And a wrench body 12 into which a hook handle portion 11b of the hook 11 is inserted. The hook handle portion 11b is pivotally supported by the wrench body 12, and the hook 11 is pivoted from a substantially coaxial line A with the wrench body 12. The hook handle 11b is provided with an engaged portion 13 at the rear end thereof, and a spring 15 is urged inside the wrench body 12 correspondingly. A structure is employed in which an engaging member 14 that engages with the engaged portion 13 and normally keeps the hook 11 and the spanner body 12 on the substantially coaxial line A is provided. The above-mentioned approximately coaxial line A means an imaginary line in which the hook 11 and the spanner main body 12 are normally engaged with each other, and the hook 11 faces upward or downward with respect to the spanner main body 12 in production. However, in the normal engagement state, both are maintained on the coaxial line A.

[0007]

[Action]

 In the above configuration, for example, when a tool is attached to the collet chuck, after inserting the shank portion of the tool 5 into the through hole 4 of the collet 3 fitted into the taper hole 2 of the chuck body 1 as shown in FIG. As shown in FIG. 1, the tip portion of the hook 11 of the hook spanner in which the engaged portion 13 and the engaging member 14 are engaged with each other and the hook 11 and the spanner main body 12 are maintained substantially on the coaxial line A. Is engaged with the hooking groove 7a of the tightening nut 7, the spanner main body 12 is gripped and rotated. As a result, when the tightening nut 7 is tightened and the tightening torque reaches the set value and becomes larger than the spring pressure of the spring 15, as shown in FIG. 4, the engaged portion 1 is resisted against the spring 15. The engagement state between the engagement member 3 and the engagement member 14 is released, the hook 11 swings downward at a center around the pivot point 20, and the tightening torque reaches the set value by the shock and the release sound at that time. Can be detected. Therefore, by stopping the tightening at this point, the tool 5 can be reliably chucked with an appropriate tightening torque.

[0008]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a hook spanner according to an embodiment of the present invention, which includes a hook 11 including a hook portion 11a and a hook handle portion 11b extending straight from a rear end thereof. , A spanner body 12 into which the hook handle 11b of the hook 11 is inserted, and the spanner body 12 has an engaging member 14 that engages with an engaged portion 13 provided at a rear end of the hook handle 11b. A spring 15 for urging the engaging member 14 toward the engaged portion 13 and a spring pressure adjusting member 16 for adjusting the spring pressure of the spring 15.

As shown in FIG. 2, the wrench body 12 has a flat rectangular tube-shaped hook support portion 12a formed at the front portion thereof and a cylindrical grip portion 12b formed at the rear portion thereof. As shown, in the rectangular space 18 of the hook support portion 12a, the hook handle portion 11b is inserted with a margin so that the hook handle portion 11b can be vertically swung, and the engaging member 14 is arranged correspondingly. A spring 15 and a spring pressure adjusting member 16 are arranged in the circular space 19 of the grip portion 12b.

As shown in FIGS. 1 and 2, the hook 11 swings in the vertical direction when its hook handle 11b is pivotally supported by the front end of the hook support 12a via a pivot shaft 20. It is formed to be movable.

As shown in FIG. 3, the engaged portion 13 has an arcuate cam surface 13a recessed in the center of the rear end surface of the hook handle 11b, and the rear end surface of the arcuate cam surface 13a continuous with the arcuate cam surface 13a. It is composed of an inclined cam surface 13b and a vertical cam surface 13c formed on the upper and lower portions.

As shown in FIG. 3, the engaging member 14 includes a sliding block 21 slidably arranged on the bottom surface of the rectangular space 18, and a concave portion formed on an inclined front surface 21 a of the sliding block 21. The shaft portions 23a, 23a, which are fitted into the portion 22 and project from both end surfaces thereof, are fitted into the arcuate concave bearing surface 24 formed on the inclined front surface 21a, and the arcuate cam surface of the engaged portion 13 13a and the engaging roller 23, which is fitted in the recess 25 formed in the upper surface 21b of the sliding block 21, and the shaft portions 26a, 26a projecting from both end surfaces of the engaging roller 23 arc formed in the upper surface 21b. It is composed of a floating prevention roller 26 that fits into the concave bearing surface 27 and contacts the ceiling surface of the rectangular space 18, and the engaging roller 23 engages with the arcuate cam surface 13a of the hook 11. , Hook 1 1 And the wrench body 12 are maintained substantially on the coaxial line A (state in FIG. 1). Of course, even when these two are engaged normally, even if the axis of the hook 11 and the axis of the spanner body 12 are formed so as to be broken at the engagement point, it will be referred to as a substantially coaxial axis in the present invention. It can be said that there is on line A.

As shown in FIG. 1, the spring 15 is projectingly provided on the rear end surface of the sliding block 21 and movably penetrates a partition wall 29 that partitions the rectangular space 18 and the circular space 19 of the spanner body 12. It is arranged between the spring seat 31 that fits into the small-diameter portion 30a of the support rod 30 and the spring pressure adjusting member 16. The engaging roller 23 is brought into pressure contact with the arcuate cam surface 13a, and the hook 11 is released. And the wrench body 12 are integrally engaged.

As shown in FIG. 1, the spring pressure adjusting member 16 includes a male screw portion 33 that is screwed into a female screw portion 32 formed on the inner peripheral surface of the circular space 19, and between the male screw portion 33 and the spring 15. The spring seat 34, which is interposed, is integrally connected to the rear end portion of the male screw portion 33 by a bolt 35 and a rotation stop pin 36, and the outer peripheral portion 37a thereof is loosely fitted to the rear end portion of the wrench body 12 and is a torque adjust ring 37. By rotating the torque adjust ring 37 in the normal direction or in the reverse direction, the spring pressure of the spring 15 can be freely adjusted to set the tightening torque to a desired value.

In the above structure, for example, when attaching a tool to a collet chuck, as shown in FIG. 5, the shank portion of the tool 5 is inserted into the through hole 4 of the collet 3 fitted into the tapered hole 2 of the chuck body 1. After being inserted, as shown in FIG. 1, the arc cam surface 13a and the engaging roller 23 are engaged with each other, and the hook 11 and the wrench body 12 are maintained substantially on the coaxial line A. It suffices to engage the tip portion with the hooking groove 7a of the tightening nut 7, grasp the grasping portion 12b of the wrench body 12, and perform the pivoting operation. As a result, the tightening nut 7 is tightened, and when the tightening torque reaches the set value and becomes larger than the spring pressure of the spring 15, as shown in FIG. 4, the engaging roller 23 moves against the arc cam surface against the spring 15. 13a is disengaged, the engagement state between the two is released, the hook 11 swings downward about the pivot shaft 20 all at once, and the tightening torque reaches the set value due to the shock and the release sound at that time. Can be detected. Therefore, by stopping the tightening at this point, the tool 5 can be reliably chucked with an appropriate tightening torque.

Further, from the state shown in FIG. 4, simply by gripping the wrench main body 12 and pulling up the hook 11 against the spring 15, the engaging roller 23 becomes an arc cam surface 13a as shown in FIG. The hook 11 and the wrench body 12 can be re-engaged and returned to the original state in which the hook 11 and the spanner body 12 are maintained on the substantially coaxial line A. In this embodiment, both the engagement roller 23 and the floating prevention roller 26 are formed so as to be rollable during operation, so that the occurrence of wear during operation is reduced.

[0018]

[Effect of device]

 According to the present invention, by simply engaging the hook with an object to be tightened, such as a tightening nut of a collet chuck, grasping the wrench body and rotating the hook, the object to be tightened can be simply tightened. When the tightening torque reaches the set value, the hook swings downward at once, and it is possible to detect that the tightening torque has reached the set value from the shock and the release sound at that time. Therefore, by stopping the tightening at that point, the tool can be securely attached to the collet chuck with an appropriate tightening torque. In addition, the structure is simple, and the size and weight are very easy to operate.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hook spanner according to an embodiment of the present invention.

FIG. 2 is a cutaway plan view of the same portion.

FIG. 3 is an exploded perspective view of the main part.

FIG. 4 is a vertical cross-sectional view showing a completed tightening state of the hook spanner.

FIG. 5 shows the prior art of the present invention and its usage.

[Explanation of symbols]

 11 Hook 11a Hook Part 11b Hook Handle 12 Spanner Main Body 13 Engagement Part 13a Arc Cam Surface of Engagement Part 14 Engagement Member 15 Spring 20 Pivot (Pivot) 23 Engagement Roller of Engagement Member

Claims (1)

[Scope of utility model registration request] 1. A hook having a hook portion and a hook handle portion extending straight from a rear end of the hook, and a spanner body into which the hook handle portion of the hook is inserted. The hook handle portion is pivotally supported by the spanner body. , The hook can be swung downward about a pivot from a substantially coaxial line with the spanner main body, and an engaged portion is provided at the rear end of the hook handle, corresponding to the inside of the spanner main body. The hook spanner is provided with an engaging member that is biased by a spring and engages with the engaged portion, and normally keeps the hook and the spanner body on a substantially coaxial line.