TWI720754B - Retractable tool handle - Google Patents

Abstract

A retractable tool handle is provided, including: an inner rod; an outer tube, being rotatably sleeved on the inner rod; a restricting member, disposed between the inner rod and the outer tube; wherein at least one of an outer circumferential surface of the inner rod and an inner circumferential surface of the outer tube has a groove circumferentially extending thereon, the depth of the groove is varied along a circumferential direction of the retractable tool handle, the restricting member is engaged within the groove and rotatable relative to the groove between a first position and a second position; when the restricting member is in the first position, the inner rod and the outer tube are axially movable relative to each other; when the restricting member is in the second position, the restricting member radially urges and is abutted against the inner rod and the outer tube so that the inner rod and the outer tube are axially unmovable relative to each other.

Description

Tool handle telescopic structure

The invention relates to a telescopic structure of a tool handle.

The grips of general tools are mostly fixed in size and cannot be adjusted in length according to the operating environment and requirements, and the operation convenience is insufficient. Therefore, tools with adjustable grip length have been developed on the market. Users can adjust the length of the grip according to the operating environment and needs. For example, increasing the length of the grip can extend the tool into a narrower or farther environment from the user. Use, can also increase the force arm to achieve the effect of labor-saving operation; shorten the length of the handle can achieve the effect of easy to carry and store.

However, the conventional handle adjustment structure can be adjusted through the engagement of the clamping member provided in the inner tube with the groove provided in the outer tube, and it has many parts, complicated structure and difficult assembly and processing. In addition, the card abutting piece abuts against the groove at a fixed position, which is likely to cause poor locking effect due to the wear of the parts under long-term use, and there are shortcomings that need to be improved urgently.

Therefore, it is necessary to provide a novel and progressive telescopic structure of the tool handle to solve the above-mentioned problems.

The main purpose of the present invention is to provide a tool handle telescopic structure, which is simple in structure and easy to operate.

In order to achieve the above object, the present invention provides a telescopic structure for a tool handle, which includes: an inner rod; an outer tube rotatably sleeved on the inner rod; and a locking member arranged between the inner rod and the outer tube Wherein, at least one of the outer circumferential surface of the inner rod and the inner circumferential surface of the outer tube is recessed with a circumferentially extending groove and defines a central axis, the groove having a phase relative to the central axis in the circumferential direction Different depths, the locking member is locked in the groove and can rotate relative to the groove between a first position and a second position; when the locking member is in the first position, the inner rod It is axially movable relative to the outer tube; when the locking member is located at the second position, the locking member radially urges the inner rod and the outer tube, and the inner rod and the outer tube are not axially movable relative to each other.

1: Tool handle telescopic structure

10: inner rod

11: groove

111: groove bottom

20: Outer tube

30: Cards

A: Central axis

D1: Maximum distance

D2: Maximum depth

D3: minimum depth

T1: Maximum thickness

Figure 1 is a perspective view of a preferred embodiment of the present invention.

Figure 2 is an exploded view of a preferred embodiment of the present invention.

3 is a cross-sectional view of a latch in a first position of a preferred embodiment of the present invention.

4 is a cross-sectional view of the latch in a second position according to a preferred embodiment of the present invention.

Fig. 5 is an operational cross-sectional view of the latch in the first position of a preferred embodiment of the present invention.

Fig. 6 is a partial cross-sectional view of the latch in the second position of a preferred embodiment of the present invention.

The following examples are only used to illustrate the possible implementation aspects of the present invention, but they are not intended to limit the scope of protection of the present invention, and are described first.

Please refer to FIGS. 1 to 6, which show a preferred embodiment of the present invention. The telescopic tool handle structure 1 of the present invention includes an inner rod 10, an outer tube 20 and a latch 30.

The outer tube 20 is sleeved on the inner rod 10 in a relatively rotatable manner; the latch 30 is provided between the inner rod 10 and the outer tube 20; wherein, the outer circumference of the inner rod 10 and the outer tube 20 At least one of the inner peripheral surfaces is recessed with a circumferentially extending groove 11 and defines a central axis A. The groove 11 has a different depth relative to the central axis A in the circumferential direction, and the locking member 30 is locked In the groove 11 and can rotate relative to the groove 11 between a first position and a second position; when the latch 30 is in the first position, the inner rod 10 and the outer tube 20 can be Relative axis movement, as shown in Figure 3; when the latch 30 is located at the second position, the latch 30 radially urges the inner rod 10 and the outer tube 20, the inner rod 10 and the outer tube 20 can not move relative to the axis, as shown in Figure 4. Thereby, the inner rod 10 and the outer tube 20 can be relatively rotated to release or tighten the locking member 30, so that the axial positions of the inner rod 10 and the outer tube 20 can be adjusted, the structure is simple, the assembly and manufacturing are easy, And easy to operate.

The locking member 30 can be radially deformed and supported between the inner rod 10 and the outer tube 20 to increase friction and be driven. Preferably, when the inner rod 10 and the outer tube 20 rotate relative to each other, the frictional contact force between the latch 30 and one of the inner rod 10 and the outer tube 20 provided with the groove 11 is less than that of the groove 11 The frictional contact force between the latch 30 and the other of the inner rod 10 and the outer tube 20. Thereby, one of the inner rod 10 and the outer tube 20 can drive the latch 30 to rotate relative to the groove 11, and the operation is smooth. Viewed along an axial direction of the inner rod 10, when the locking member 30 is located at the second position, the maximum thickness of the locking member 30 is greater than the inner peripheral surface of the outer tube 20 and the groove 11 The maximum distance D1 between the bottoms 111 can be stably abutted and not easy to loosen. In this embodiment, the outer diameter of the latch 30 is slightly larger than the inner diameter of the outer tube 20, and the inner diameter of the latch 30 is slightly larger than the outer diameter of the groove bottom 111, whereby the The latch 30 can be held in contact with the bottom of the groove 111 Abutting against the inner peripheral surface of the outer tube 20, when the latch 30 is located at the second position, the inner rod 10 and the outer tube 20 can reliably and stably abut against each other. A lubricating material is arranged between the inner rod 10 and the outer tube 20, and the inner rod 10 and the outer tube 20 can move relatively smoothly, which is convenient for telescopic adjustment and reduces wear.

The outer peripheral surface of the latching member 30 is preferably an arc surface, which can be stably abutted in the radial direction and avoid excessive frictional contact force that is difficult to axially move. In detail, in the axial direction, the width of the groove 11 is preferably greater than the thickness of the latch 30. When the latch 30 is located at the first position, the latch 30 can be slightly opposite to the groove 11 The side portion of the arc surface is yaw to connect with the outer tube 20, and the contact area is small. The inner rod 10 can smoothly slide axially relative to the outer tube 20; when the latch 30 is located at the second When in position, the locking member 30 abuts against the outer tube 20 with the middle part of the arc surface due to the radial force, and has a larger contact area and can be stably abutted.

In this embodiment, the latch 30 is a C-shaped fastener and can be made of metal, plastic or rubber, which is easy to assemble and easy to deform radially. Of course, the latch can also be a closed ring. The inner peripheral surface of the latching member 30 corresponds to the outer peripheral surface of the inner rod 10, which can disperse the force to avoid part abrasion caused by local resistance; the groove 11 is a ring groove provided on the inner rod 10, the The locking member 30 has different radial thicknesses at different positions in the circumferential direction. When viewed along the axial direction, the maximum thickness T1 of the locking member 30 is greater than the maximum depth D2 of the annular groove, the locking member 30 It keeps protruding from the annular groove and can be driven by the outer tube 20. Of course, the groove can also be provided on the inner peripheral surface of the outer tube; the outer tube and the inner tube can also be provided with the groove, and the radial thickness of the locking member remains the same. Preferably, viewed along the axial direction, the maximum depth D2 of the ring groove is greater than the minimum depth D3 of the ring groove (the maximum depth D2 is preferably at least 1.2 times the minimum depth). With the above structure, the inner rod 10 and the outer tube 20 can be forced or released from each other by the radial thickness of the locking member 30 and the depth of the annular groove. The structure is simple and easy to assemble and operate. The contact position of the switch 30 with the inner rod 10 and the outer tube 20 is not a single fixed position, which can reduce the wear of various parts and increase the service life. When should When the locking member 30 is in the first position, the inner rod 10 and the outer tube 20 are coaxial and can move smoothly relative to each other; when the locking member 30 is in the second position, the inner rod 10 and the outer tube 20 different shafts and abutting each other, it is not easy to move relative to each other during operation.

1: Tool handle telescopic structure

10: inner rod

20: Outer tube

Claims (10)

A telescopic structure for a tool handle, comprising: an inner rod; an outer tube rotatably sleeved on the inner rod; a catch piece arranged between the inner rod and the outer tube; wherein the inner rod At least one of the outer circumferential surface and the inner circumferential surface of the outer tube is recessed with a circumferentially extending groove and defines a central axis. The groove has a different depth in the circumferential direction relative to the central axis. The latch It is clamped in the groove and can be rotated relative to the groove between a first position and a second position; when the latch is in the first position, the inner rod and the outer tube can move relative to the axis ; When the locking member is located in the second position, the locking member radially urges the inner rod and the outer tube, the inner rod and the outer tube can not move relative to the axis. The tool handle telescopic structure according to claim 1, wherein when viewed along an axial direction of the inner rod, when the locking member is in the second position, the maximum thickness of the locking member is greater than the inner circumference of the outer tube The maximum distance between the surface and the bottom of one of the grooves. The tool handle telescopic structure according to claim 1, wherein the inner peripheral surface of the catch member corresponds to the contour of the outer peripheral surface of the inner rod. The telescopic structure of the tool handle according to claim 1, wherein the catch member is radially deformable and supports between the inner rod and the outer tube. The tool handle telescopic structure according to claim 1, wherein when the catch is at the first position, the inner rod is coaxial with the outer tube; when the catch is at the second position, the inner rod and The outer tube has different axis. The tool handle telescopic structure according to claim 1, wherein the groove is an annular groove provided on the inner rod, and the locking member has a different radial thickness at a different position in the circumferential direction, along the inner rod Viewed from the axial direction of one of the rods, the maximum radial thickness of the latch is greater than the maximum depth of the annular groove. The tool handle telescopic structure according to claim 6, wherein the maximum depth of the ring groove is at least 1.2 times the minimum depth of the ring groove when viewed along the axial direction. According to claim 1, the telescopic structure of the tool handle, wherein the outer peripheral surface of the latch is a curved surface. The tool handle telescopic structure according to claim 7, wherein when viewed along an axial direction of the inner rod, when the locking member is in the second position, the maximum thickness of the locking member is greater than the inner circumference of the outer tube The maximum distance between the surface and the bottom of the groove; the inner peripheral surface of the latch corresponds to the contour of the outer peripheral surface of the inner rod; the latch can be radially deformed to support the inner rod and the inner rod Between the outer tube; the latch is a C-shaped fastener; when the latch is in the first position, the inner rod is coaxial with the outer tube; when the latch is in the second position, the The inner rod and the outer tube have different axes and abut each other; the outer peripheral surface of the latch is an arc surface; a lubricating material is arranged between the inner rod and the outer tube. The tool handle telescopic structure according to any one of claims 1 to 9, wherein when the inner rod and the outer tube rotate relative to each other, the latch and the inner rod and the outer tube are provided with one of the grooves The frictional contact force therebetween is less than the frictional contact force between the latch and the other of the inner rod and the outer tube.

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