TW201836780A - Tool with safety lockmechanism enabling a stable locking effect between the first and second extension members, and avoiding the unplanned switching from the locked state to the released state - Google Patents

Abstract

The tool with the safety lockmechanism of the present invention includes a first and a second extension member and a safety lockmechanism. The first extension member includes a position-limiting portion, wherein the position-limiting portion has a flat bottom surface. The second extension member includes a hosting hole and a stopping portion. The safety lockmechanism comprises a positioning member and a control member. The positioning member is disposed on the hosting hole and has a flat bottom surface. The flat bottom surface of the positioning member selectively presses against the flat bottom surface of the position-limiting portion corresponding to the control member, so that the safety lockmechanism can move between the locking position and the release position, thereby enabling a stable locking effect between the first and second extension members, and avoiding the unplanned switching from the locked state to the released state.

Description

Tool with locking safety mechanism

The present invention primarily discloses a tool, and more particularly a tool having a locking safety mechanism.

The Republic of China Patent Publication No. 554799 is a telescopic post of a hand tool comprising a handle, a collar and an extension rod, the collar being adapted to extend into the handle and the collar being fixed to the extension rod. Parts such as an elastic ring sleeve, a forced column and a rack are provided in the sleeve ring. In use, the extension rod is rotated relative to the handle, so that the sleeve ring rotates together with the extension rod to elastically engage the rack to the handle, and the lock between the handle and the extension rod is formed, and the handle is rotated in the opposite direction. Or the extension rod can form a release state to adjust the extension length again.

As shown in Figure 1 of the above patent, the head end of the handle has a socket wrench head for operation, but during use of the toggle handle, the handle and the extension rod are easily biased by the user instead of The plan is switched from the locked state to the released state.

In view of the above problems of the prior art, which cannot be effectively solved and overcome, the present applicant has filed this patent application to solve the aforementioned problems.

The technical problem to be solved by the tool having the locking safety mechanism of the present invention is that the grip between the grip of the telescopic post and the extension rod is easily switched from the locked state to the released state due to the force rather than the plan.

Accordingly, the present invention provides a tool having a locking safety mechanism that includes a first extension member, a second extension member, and a locking safety mechanism disposed between the first extension member and the second extension member. The first extension member has a first end and a second end opposite to each other, the first end of the first extension member forming a first working portion, the first extension member having an outer surface, the first extension member The outer surface defines a limiting portion extending from a first end of the first extension member toward a second end of the first extension member on one side, the limiting portion having a first flat bottom surface. The second extension member includes a first end and a second end opposite to each other, and the first end of the second extension member is slidably disposed at the second end of the first extension member, and the second extension member is The second end portion has a second working portion, the second extending member has an inner side surface and an outer side surface, the inner side surface of the second extending member is provided for the first extending member to be disposed therein, and the second extending member is provided with a a through hole penetrating the outer side surface and the inner side surface and a stopper portion disposed on the outer side surface. The locking safety mechanism includes a positioning member and a control member, the positioning member is disposed on the hole of the second extension member, the positioning member has a positioning portion, and the positioning portion has a second flat bottom surface, the second flat bottom The surface selectively presses against the first flat bottom surface of the limiting portion, the control member is rotatably disposed on the second extending member along an operating shaft and selectively contacts the positioning member, so that the locking safety mechanism can Move between the locked position and the released position.

When the locking safety mechanism is in the locking position, the control member contacts the positioning member, and the second flat bottom surface of the positioning member presses against the first flat bottom surface of the limiting portion, the second extension member and the first extension member There is no relative axial slip relationship between them.

When the locking safety mechanism is in the release position, the control member does not contact the positioning member, and the second flat bottom surface of the positioning member does not press against the first flat bottom surface of the limiting portion, the second extension member and the first A relative axial slip relationship can be created between the extensions.

The locking member selectively contacts the positioning member by rotating the control member, and the second flat bottom surface of the positioning portion selectively presses against the first flat bottom surface of the limiting portion, so that the locking safety mechanism The first extension member and the second extension member can be prevented from being switched from the locked state to the released state due to the force rather than the plan.

Other objects, advantages and novel features of the invention will become apparent from the description and appended claims.

The present invention is described with respect to the preferred embodiments and the accompanying drawings.

Referring to Figures 1 to 5, a first embodiment of a tool 10 having a locking safety mechanism of the present invention includes a first extension member 20, a second extension member 30 slidably disposed on the first extension member 20, and a A locking safety mechanism 40 between the first extension 20 and the second extension 30.

The first extension member 20 has a cylindrical shape, and the first extension member 20 has a first end 201 and a second end 202 opposite to each other, and the first end 201 of the first extension member 20 forms a first working portion 21. In this embodiment, the first working portion 21 can be an adjustable angled plucking head.

The first extension member 20 has an outer surface 22, and the outer surface 22 of the first extension member 20 defines a stop portion 23 extending from the first end 201 of the first extension member 20 toward the second end 202 on one side. In the embodiment, the limiting portion 23 can have a concave arc shape.

The first extension member 20 includes a stop portion 24 that is raised by the outer surface 22, and the stop portion 24 can stop the second extension member 30.

The second extension member 30 is axially slidably sleeved on the first extension member 20, and the second extension member 30 and the first extension member 20 are not in a relative rotational relationship. The second extension member 30 has a hollow circular tubular shape and has an inner side surface 31 and an outer side surface 32. The inner side surface 31 of the second extension member 30 is provided for the first extension member 20 to be disposed therein. In this embodiment, the inner side surface 31 of the second extension member 30 can have a circular hole shape.

The second extension 30 includes a first end 301 and a second end 302 that are opposite one another. The first end 301 of the second extension member 30 is slidably disposed on the second end 202 of the first extension member 20, and the first end 301 of the second extension member 30 defines a hole through the outer side surface 32 and the inner side surface 31. 33 and a stop portion 34 disposed on the outer side 32. In the embodiment, the hole 33 and the stopping portion 34 are located in the same direction, and the stopping portion 34 can be a slot.

The second end 302 of the second extension member 30 forms a second working portion 35. In this embodiment, the second working portion 35 can be a handle for the user to hold.

The second extension member 30 includes a latching groove 36 formed in the circumferential direction of the second extension member 30 on the outer side surface 32 of the second extension member 30.

The locking safety mechanism 40 is operable by a user and moves between a locked position and a released position. When the locking safety mechanism 40 is in the locked position, the second extension member 30 and the first extension member 20 cannot be in a relative axial sliding relationship, and the second extension member 30 and the first extension member 20 cannot be opposite each other. Rotation relationship. When the locking safety mechanism 40 is in the release position, a relative axial sliding relationship can be generated between the second extension member 30 and the first extension member 20 to achieve the effect of the length of the telescopic adjustment.

The locking safety mechanism 40 includes a positioning member 41 and a control member 42. The positioning member 41 is disposed on the hole 33 of the second extension member 30, and the positioning member 41 can generate a relative radial movement relationship in the cavity 33. The positioning member 41 selectively presses the limiting portion 23 of the first extension member 20.

In the present embodiment, the positioning member 41 can be cylindrical, and the axial line of the positioning member 41 and the axial line of the first extension member 20 are parallel to each other. The positioning member 41 has a diameter larger than the depth of the hole 33, so that the positioning member 41 has an urging portion 411 protruding toward the outside of the hole 33 toward the outer side surface 32 of the second extending member 30 and a portion facing the second extending member 30. The side surface 31 protrudes from the positioning portion 412 outside the hole 33, and the pushing portion 411 can be selectively pushed and pushed by the control member 42 to press the positioning portion 412 against the limiting portion 23 of the first extending member 20.

The control member 42 is rotatably disposed on the second extension member 30 along an operating shaft OA such that the locking safety mechanism 40 is movable between the locked position and the released position. The control member 42 includes a pivot hole 421 extending along the operating shaft OA. The pivot hole 421 is pivotally connected to the outer side surface 32 of the second extension member 30 to enable the control member 42 to pivot relative to the second extension member 30.

The control member 42 includes an eccentric groove 422. The eccentric groove 422 is disposed on the inner circumferential surface of the control member 42 and corresponds to the positioning member 41. The positioning member 41 is located at the limiting portion 23 of the first extension member 20 and the eccentric groove 422 of the control member 42. The eccentric groove 422 has a deep portion 423 and a shallow portion 424 connected to one side of the deep portion 423. The distance from the shallow portion 424 to the outer side surface 32 of the second extension member 30 is smaller than the depth portion 423 to the outer side surface 32 of the second extension member 30. distance. The deep portion 423 or the shallow portion 424 of the eccentric groove 422 selectively contacts the pushing portion 411 of the positioning member 41 corresponding to the rotation of the control member 42 with respect to the second extending member 30, so that the positioning portion 412 of the positioning member 41 can selectively resist the first portion A limiting portion 23 of the extension member 20.

The control member 42 includes a first stopping hole 425 and a second stopping hole 426. The first stopping hole 425 and the second stopping hole 426 respectively penetrate the outer circumferential surface of the control member 42 in the radial direction of the operating shaft OA. Weekly. The first stop hole 425 includes a first center line L425 passing through the operating shaft OA, and the second stop hole 426 includes a second center line L426 passing through the operating shaft OA, the first center line L425 and the second center line L426. Form an angle Θ less than 90 degrees.

The control member 42 includes a restricting groove 427 which is formed on the outer peripheral surface of the control member 42 in the circumferential direction of the control member 42.

The locking safety mechanism 40 includes a restraining member 43, a first stop member 44, a second stop member 45, and a fastener member 46. The restricting member 43 is disposed on the restricting groove 427 of the control member 42. The restricting member 43 includes a first restricting portion 431 and a second restricting portion 432. In the present embodiment, the restricting member 43 can be made of stainless steel, and the first restricting portion 431 and the second restricting portion 432 can respectively be holes and have an aperture D431 of the same size. The restricting member 43 can also include an opening 433 such that the restricting member 43 has a C-shaped cross-sectional shape perpendicular to the operating shaft OA and has the ability to elastically expand.

The first stopper 44 is disposed at the first stop hole 425 of the control member 42 and between the outer side surface 32 of the second extension member 30 and the first restriction portion 431 of the restriction member 43. The second stopper 45 is disposed between the second stopper hole 426 of the control member 42 and between the outer side surface 32 of the second extension member 30 and the second restriction portion 432 of the restriction member 43. In this embodiment,

The first stopper 44 and the second stopper 45 are respectively steel balls and have an outer diameter D44 of the same size, and the apertures D431 of the first restricting portion 431 and the second restricting portion 432 are smaller than the first stopper 44 and the first The outer diameter D44 of the second stopper 45 prevents the first stopper 44 and the second stopper 45 from being separated from the first stopper hole 425 and the second stopper hole 426. The first stopper 44 and the second stopper 45 are correspondingly rotated relative to the second extension 30 to be selectively latched to the stopper 34 of the second extension 30, so that the locking safety mechanism 40 can Move between the locked position and the released position.

The locking safety mechanism 40 includes a fastener 46 disposed on the latching slot 36. The latching member 46 stops at one end of the control member 42 so that no relative axial sliding between the second extending member 30 and the control member 42 occurs. The relationship is shifted and the control member 42 is prevented from disengaging from the second extension member 30.

As shown in FIG. 3 to FIG. 5, when the locking safety mechanism 40 is in the locking position, the shallow portion 424 of the eccentric groove 422 of the control member 42 contacts the pushing portion 411 of the positioning member 41, so that the positioning portion 412 of the positioning member 41 is pressed. The limiting portion 23 of the first extension member 20, and the eccentric groove 422 of the control member 42 and the inner side surface 31 of the second extension member 30 can simultaneously press the positioning member 41 and the first extension member 20, and the first stopper member 44 is stuck. The stop portion 34 of the second extension member 30 ensures that the control member 42 cannot be arbitrarily rotated relative to the second extension member 30, thereby preventing the lock safety mechanism 40 from being unplanned from the locked state to the released state. Therefore, there is no relative axial sliding relationship between the second extension member 30 and the first extension member 20 for the user to smoothly complete the work.

The user can rotate the control member 42 to move the locking safety mechanism 40 from the locked position to the release position. As shown in FIGS. 6 to 9, when the locking safety mechanism 40 is in the release position, the pushing portion 411 of the positioning member 41 is located. In the deep portion 423 of the eccentric groove 422, the control member 42 does not contact the positioning member 41, so that the positioning portion 412 of the positioning member 41 does not press against the limiting portion 23 of the first extending member 20, and the first stopping member 44 is disengaged from the second extending member. The stopper portion 34 of the 30 is abutted against the outer side surface 32 of the second extension member 30, so that a relative axial sliding relationship can be generated between the second extension member 30 and the first extension member 20, so as to have a locking safety mechanism. The tool 10 of 40 has the function of adjusting the length of the telescopic adjustment.

Referring to Figures 10 to 16, the structure and operation of the second embodiment of the tool 10a having the locking safety mechanism of the present invention are substantially the same as those of the first embodiment, with the following differences:

The limiting portion 23a of the first extension member 20a is a groove extending in a direction parallel to the operation axis OA, and the limiting portion 23a has a first flat bottom surface 231a and two first sides perpendicular to the first flat bottom surface 231a, respectively. 232a, the two first sides 232a face each other and are parallel to each other.

The hole 33a of the second extension member 30a has two second side faces 331a facing each other, and a first width W331a is formed between the two second side faces 331a. The stopper portion 34a of the second extension member 30a is a hole extending in the circumferential direction of the second extension member 30a, and the stopper portion 34a extends in the circumferential direction of the second extension member 30a to have a second width W34a, the second width. W34a is larger than the outer diameter D44 or the first width W331a of the first stopper 44, and the stopper portion 34a has a length L34a in the direction parallel to the operation axis OA, and the length L34a is equal to the outer diameter D44 of the first stopper 44 when the lock When the safety mechanism 40a is in the locked position, the first stopper 44 is locked to the stopper portion 34a and is slidable relative to the stopper portion 34a in the circumferential direction of the second extension member 30a, whereby the stroke of the control member 42 can be controlled. There is no relative axial sliding relationship between the second extension 30a and the first extension 20a.

The positioning member 41a has an urging portion 411a protruding outward from the outer side surface 32a of the second extending member 30a, a positioning portion 412a protruding outward from the inner side surface 31a of the second extending member 30a, and two positioning portions 412a. The abutting faces 413a of the urging portions 411a and the positioning portions 412a are respectively connected. The pushing portion 411a has a semi-circular cross-sectional shape perpendicular to the operating axis OA, and the positioning portion 412a has a rectangular cross-sectional shape perpendicular to the operating axis OA to form a second flat bottom surface 414a that selectively presses the first flat bottom surface 231a, The abutting faces 413a are parallel to each other and abut against the two first side faces 232a of the limiting portion 23a and the two second side faces 331a of the bore 33a, respectively. When the locking safety mechanism 40a is in the locking position, the second flat bottom surface 414a of the positioning member 41a presses against the first flat bottom surface 231a of the limiting portion 23a, and the second extending member 30a and the first extending member 20a cannot be opposite each other. Axial slip relationship. When the locking safety mechanism 40a is in the release position, the second flat bottom surface 414a of the positioning member 1a is not pressed against the first flat bottom surface 231a of the limiting portion 23a, and the second extending member 30a and the first extending member 20a can be oppositely Axial slip relationship. By increasing the contact area between the positioning member 41a and the limiting portion 23a and the hole 33a, the reliability of the locking safety mechanism 40a between the locking position and the releasing position is improved, and the first extension 20a and the first portion are avoided. The two extension members 30a are switched from the locked state to the released state due to the force rather than the plan.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, so that the numerical values are changed or the equivalent elements are replaced, or the equivalent changes are made according to the scope of the present invention. Modifications are still within the scope of the invention patent.

10‧‧‧Tools with locking safety mechanisms

20‧‧‧First extension

201‧‧‧ first end

202‧‧‧ second end

21‧‧‧First Work Department

22‧‧‧ outer surface

23‧‧‧Limited

24‧‧‧stop

30‧‧‧Second extension

301‧‧‧ first end

302‧‧‧ second end

31‧‧‧ inside

32‧‧‧Outside

33‧‧‧ Holes

34‧‧‧Departure

35‧‧‧Second Work Department

36‧‧‧ card slot

40‧‧‧Locking security agency

41‧‧‧ Positioning parts

411‧‧‧Pushing Department

412‧‧‧ Positioning Department

42‧‧‧Controls

421‧‧‧ pivot hole

422‧‧‧Eccentric slot

423‧‧‧Deep

424‧‧‧ shallow

425‧‧‧First stop hole

L425‧‧‧ first centerline

426‧‧‧second stop hole

L426‧‧‧ second centerline

427‧‧‧Restricted slot

43‧‧‧Restrictions

431‧‧‧First Restriction Department

D431‧‧‧ aperture

432‧‧‧Second Restriction

433‧‧‧ openings

44‧‧‧First stop

D44‧‧‧ outside diameter

45‧‧‧Second stop

46‧‧‧fasteners

OA‧‧‧Operating shaft

Θ‧‧‧角角

10a‧‧‧Tools with locking safety mechanisms

20a‧‧‧First extension

23a‧‧‧Limited

231a‧‧‧ first flat bottom

232a‧‧‧ first side

30a‧‧‧Second extension

31a‧‧‧ inside

32a‧‧‧Outside

33a‧‧‧ Holes

331a‧‧‧ second side

W331a‧‧‧first width

34a‧‧‧Departure

W34a‧‧‧second width

L34a‧‧‧ length

40a‧‧‧Locking security agency

41a‧‧‧positioning parts

411a‧‧‧Pushing Department

412a‧‧‧ Positioning Department

413a‧‧‧Abutment

414a‧‧‧Second flat bottom

Figure 1 is a perspective view of a first embodiment of a tool having a locking safety mechanism of the present invention. 2 is an exploded perspective view of a first embodiment of a tool having a locking safety mechanism of the present invention. 3 is a cross-sectional view showing a first embodiment of the tool having a locking safety mechanism according to the present invention, showing that the locking safety mechanism is in a locked state, and the first stopper of the locking safety mechanism is locked to the stop of the second extension member; unit. 4 is a cross-sectional view showing a first embodiment of a tool having a locking safety mechanism according to the present invention, showing that the locking safety mechanism is in a locked state, the control member of the locking safety mechanism contacts the positioning member, and the positioning member abuts against the first extension member. Limiting department. Figure 5 is a cross-sectional view of the first embodiment of the tool with the locking safety mechanism of the present invention, showing the locking safety mechanism in a locked state, the stop of the first extension member stopping the first end of the second extension. Figure 6 is a cross-sectional view showing a first embodiment of the tool having a locking safety mechanism according to the present invention, showing that the locking safety mechanism is in a released state, and the first stopper of the locking safety mechanism is disengaged from the stopper of the second extension. Figure 7 is a cross-sectional view showing a first embodiment of the tool having a locking safety mechanism of the present invention, showing that the locking safety mechanism is in a released state, and the control member of the locking safety mechanism does not contact the positioning member. Figure 8 is a cross-sectional view showing a first embodiment of the tool having a locking safety mechanism of the present invention, showing that the locking safety mechanism is in a released state, and the first stopper of the locking safety mechanism is disengaged from the stopper of the second extension. Figure 9 is a continuation of Figure 8 showing the relative axial sliding relationship between the second extension member and the first extension member. Figure 10 is an exploded perspective view of a second embodiment of the tool having a locking safety mechanism of the present invention. Figure 11 is a cross-sectional view showing a second embodiment of the tool having a locking safety mechanism according to the present invention, showing that the locking safety mechanism is in a locked state, and the first stopper of the locking safety mechanism is locked to the stopper of the second extension member. unit. 12 is a cross-sectional view showing a second embodiment of the tool having a locking safety mechanism according to the present invention, showing that the locking safety mechanism is in a locked state, the control member of the locking safety mechanism contacts the positioning member, and the positioning member abuts against the first extension member. Limiting department. Figure 13 is a cross-sectional view showing a second embodiment of the tool having a locking safety mechanism of the present invention, showing the locking safety mechanism in a locked state, the stop of the first extension member stopping the first end of the second extension. Figure 14 is a cross-sectional view showing a second embodiment of the tool having a locking safety mechanism according to the present invention, showing that the locking safety mechanism is in a released state, and the first stopper of the locking safety mechanism is disengaged from the stopper of the second extension. Figure 15 is a cross-sectional view showing a second embodiment of the tool having the locking safety mechanism of the present invention, showing that the locking safety mechanism is in a released state, and the control member of the locking safety mechanism is not in contact with the positioning member. Figure 16 is a cross-sectional view showing a second embodiment of the tool having a locking safety mechanism of the present invention, showing that the locking safety mechanism is in a released state, and the first stopper of the locking safety mechanism is disengaged from the stopper of the second extension.

Claims (12)

A tool having a locking safety mechanism, comprising: a first extension having a first end and a second end opposite to each other, the first end of the first extension forming a first working portion, The first extension member has an outer surface, and the outer surface of the first extension member forms a limiting portion extending from the first end of the first extension member toward the second end of the first extension member on one side, the limit The position has a first flat bottom surface; a second extension member including a first end and a second end opposite to each other, the first end of the second extension member being slidably disposed on the first extension member The second end of the second extension member forms a second working portion, the second extension member has an inner side surface and an outer side surface, and the inner side surface of the second extension member is provided for the first extension member The second extension member defines a hole extending through the outer side surface and the inner side surface and a stop portion disposed on the outer side surface; and a first extension member and the second extension member disposed on the second extension member Locking safety mechanism, its package a positioning member and a control member, the positioning member is disposed on the hole of the second extension member, the positioning member has a positioning portion, the positioning portion has a second flat bottom surface, and the second flat bottom surface is selectively pressed a first flat bottom surface of the limiting portion, the control member is rotatably disposed on the second extending member along an operating shaft and selectively contacts the positioning member, so that the locking safety mechanism can be in the locking position and the releasing position When the locking safety mechanism is in the locking position, the control member contacts the positioning member, and the second flat bottom surface of the positioning member presses against the first flat bottom surface of the limiting portion, the second extension member and the second extension member A relative axial slip relationship cannot be generated between the extension members; when the locking safety mechanism is in the release position, the control member does not contact the positioning member, and the second flat bottom surface of the positioning member does not press the limit portion The first flat bottom surface, the second extension member and the first extension member can generate a relative axial sliding relationship. A tool having a locking safety mechanism according to claim 1, wherein the control member comprises an eccentric groove disposed on an inner circumferential surface of the control member and corresponding to the positioning member, the positioning member being located at the first extension Between the limiting portion of the piece and the eccentric groove of the control member, the eccentric groove correspondingly rotates relative to the second extending member to selectively contact the positioning member, so that the locking safety mechanism can be in the locking position and Move between release positions. A tool having a locking safety mechanism according to claim 2, wherein the positioning member has an urging portion selectively urged by the control member, the ejector portion having a semicircular shape perpendicular to the operating shaft In the cross-sectional shape, the positioning portion has a rectangular cross-sectional shape perpendicular to the operating shaft to form the second flat bottom surface. A tool having a locking safety mechanism according to claim 3, wherein the limiting portion of the first extending member is a groove extending in a direction parallel to the operating axis, the limiting portion having two perpendicular to each other a first side surface of the first flat bottom surface, the through hole of the second extending member has two second side surfaces, and the positioning member has two abutting surfaces respectively connecting the pushing portion and the positioning portion, and the two receiving portions The abutments respectively abut against the two first sides of the limiting portion and the two second sides of the aperture. A tool having a locking safety mechanism according to claim 4, wherein the locking safety mechanism includes a restricting member and a first stopping member, the control member including a first stopping hole, the first stopping hole The outer circumferential surface and the inner circumferential surface of the control member penetrate the radial direction of the operating shaft, the limiting member includes a first limiting portion, and the first stopping member is disposed at the first stopping hole of the control member and located at the first Between the outer side surface of the second extension member and the first restriction portion of the restriction member, the first stopper corresponding to the rotation of the control member relative to the second extension member is selectively latched to the second extension member When the locking safety mechanism is in the locking position, the first stopping member is locked to the stopping portion of the second extending member, and the second extending member and the first extending member are not opposite to each other. An axial sliding relationship; when the locking safety mechanism is in the releasing position, the first stopping member abuts against the outer side surface of the second extension member, and the second extension member and the first extension member can be generated Relative axial slip relationship. A tool having a locking safety mechanism according to claim 5, wherein the first stopper is a steel ball and has an outer diameter, the first restricting portion is a hole and has an aperture smaller than the outer diameter, The restriction member includes an opening such that the restriction member has a C-shaped cross section perpendicular to the operation shaft, and the control member includes a restriction groove formed on an outer circumferential surface of the control member along a circumferential direction of the control member, A restriction member is disposed in the restriction groove. A tool having a locking safety mechanism according to claim 6, wherein a first width is formed between the two second sides of the bore, and a stop of the second extension is along the second extension. a circumferentially extending slot, the stop extending in a circumferential direction of the second extension member having a second width, the second width being greater than an outer diameter of the first stop or the first width The moving portion has a length in a direction parallel to the operating shaft, the length being equal to an outer diameter of the first stopping member, and the first stopping member is engaged with the second extension when the locking safety mechanism is in the locking position The stopping portion of the piece is slidable relative to the stopping portion in the circumferential direction of the second extending member, and the second extending member and the first extending member are unable to generate a relative axial sliding relationship. A tool having a locking safety mechanism according to claim 7, wherein the locking safety mechanism includes a second stopper, the control member including a second stopping hole along the operating shaft Radially extending through the outer peripheral surface and the inner peripheral surface of the control member, the restricting member includes a second restricting portion disposed at the second stopping hole of the control member and located at the second extending member Between the outer side surface and the second restricting portion of the restricting member, the second stopping member is selectively locked to the stopping portion of the second extending member corresponding to the rotation of the control member relative to the second extending member. A tool having a locking safety mechanism according to claim 8, wherein the first stop hole includes a first center line passing through the operating shaft, the second stop hole including a second center passing through the operating shaft a line, the first center line and the second center line form an angle of less than 90 degrees. The tool having a locking safety mechanism according to any one of claims 1 to 9, wherein the second extension member comprises a latching groove formed in the circumferential direction of the second extension member An outer side surface of the second extension member, the locking safety mechanism includes a fastener disposed on the latching slot, the fastener stopping at one end of the control member to prevent the second extension member from being in contact with the control member Produces a relative axial slip relationship. A tool having a locking safety mechanism according to any one of claims 1 to 9, wherein the first extension member includes a stop portion projecting from the outer surface, the stop portion being capable of stopping the second portion The first end of the extension. The tool having a locking safety mechanism according to any one of claims 1 to 9, wherein the control member includes a pivot hole extending along the operating shaft, the pivot hole being pivotally connected to the second extension The outer side surface enables the control member to pivot relative to the second extension member.