GB2521279A

GB2521279A - Tool Driver

Info

Publication number: GB2521279A
Application number: GB1422285.5A
Authority: GB
Inventors: Ching-Shu Huang
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-13
Filing date: 2014-12-15
Publication date: 2015-06-17
Also published as: GB201322073D0; GB2521205A

Abstract

The tool includes a main body 1 provided with an upper cover 11 having its lower side secured with a sleeve chamber 10 for mounting and positioning a sleeve 2 therein. An upper large opening 100 of the sleeve chamber has an annular wall disposed with lengthwise recesses 102 and engaging members 103. A non-circular reinforcing circumference 104 is disposed below the recesses and engaging members. The opening of a combination groove 110 has a notch 112 for matching with the reinforcing circumference of the sleeve chamber to increase anti-torsion strength between the chamber and the cover. The sleeve has its inner wall disposed with recesses (23, Figure 3) for receiving an upper ratchet wheel (4), which is engaged with a lower ratchet wheel (5) and a compression spring (6). The sleeve may include positioning serrations 25 of trapezium form. An adjusting member (7), which may be integrally formed, is used to accurately adjust the sleeve for deciding the pressure of the spring on both the ratchet wheels. The tool is able to adjust and restrict the locking torque of a locking stem 3.

Description

TOOL DRIVER

This invention relates to a tool driver, particularly to one provided with a sleeve having its upper edge formed with a plurality of positioning serrations to be correspondingly operated with the S positioning projections of an adjusting member. Thus, the adjustment member can be turned to change the pressure with which a compression spring presses both an upper ratchet wheel and a lower ratchet wheel to decide engagement conditions between the upper and the lower ratchet wheels for deciding the locking torque of a locking stern.

A first conventional torque-limiting driver, as disclosed in a US patent No. 7,487,700B2, titled "LOCKABLE TORQUE-LIMITING DRIVER AND METHOD", is to have an adjustment plug combined with a locking plate, and an adjuster can IS turn around the locking plate together with the adjustment plug with fingers to change and adjust combination between the adjustment plug and a sleeve for carrying out adjustment of torque. After finishing adjustment, the torque can be fixed by having the serrations of the body engaging-portion of the locking plate meshed with a pair of prongs of the sleeve.

The defect of the conventional torque-limiting driver is that disassembling action has to be carried out if an assembler wants to adjust the torque of the driver, while its advantage is that improper adjustment of locking torque can be avoided and it is possible to attain consistency of locking torque.

A second conventional torque-limiting driver, as disclosed in a US patent No. 5,397,269, titled "TORQUE LIMITING CLUTCH AND ITS USES", is to have a closure block firmly locked at an inner side of the end of a housing. Thus, the locking torque of a driven member can be decided by adjusting the closure block to be secured in the main body of the housing. A third conventional torque-limiting driver, as disclosed in a US patent No. 4,238,978, titled "TORQUE WRENCH" has an adjusting screw set at a lower side of the main body of a housing. Thus, the locking torque of a socket tool can be changed by adjustment of the adjusting screw.

The second and the third conventional torque-limiting drivers are seen most frequently on the market and their locking torque can be freely adjusted by a user, without a need to disassemble the driver.

A fourth conventional torque-limiting driver, as disclosed in a US patent No. 2011/011220 Al, titled" LOCKABLE TORQUE-LIMITING DRIVER ", and a fifth conventional torque-limiting driver, as disclosed in a TW patent No. 201100208 Al, titled "LOCKABLE TORQUE-LIMITING DRIVER ", are both created by the inventor of this invention. The defect of the fourth and fifth conventional torque-limiting driver are described as following First, the body 1 is combined by the combination holes 130 of extension member 13 and the combination studs 140 of cover 14, but the combination holes 130 and the combination studs 140 can not be easily positioned for alignment. This affects the efficiency of the body 1 assembly.

Second, the sleeve 2 has its upper annular side formed thereon with a plurality of positioning serrations 25 respectively provided with an upright face 250 and an arcuate face 251. When the torque-limiting member 7 is screwed into the sleeve, the positioning projection 73 of extension curved portions 72 of torque-limiting member 7 will be uplifted overmuch by positioning serrations 25, then the extension curved portions 72 will be over-bent and easily be broken off Third, as shown in fig. 11 of the fourth and fifth conventional torque-limiting driver. The torque-limiting member 7 is formed by a first component ( male threads 70) and a second component ( include extension curved portions 72, positioning projection 73 and actuating members 74), said two components have to be manufactured separately and then be assembled into a torque-limiting member 7. This makes the manufacturing process more time-consuming causing additional work, which is not cost-effective.

Fourth, the shape of male thread 70 of torque-limiting member 7 is triangular, said triangular male thread has a weaker structure and supporting force. Thus, the male thread 70 will easily become out of shape resulting in the torque-limiting member 7 becoming detached from the sleeve 2. Moreover, the torque-limiting member 7 has a big outside diameter and without any guiding structure, Thus, the torque-limiting member 7 and sleeve 2 are difficult to be precisely screwed and there are some dislocation or sticking problems in the assembly process.

Fifth, the actuating member 74 of torque-limiting member 7 is not a necessary member, even if there is no actuating member 74, the torque-limiting member 7 is still able to be rotated by user's S finger or other auxiliary tools. Besides, the actuating member 74 will increase the outer diameter of extension curved portions 72 and make the body 1 have a wider extension member 13. Thus, the actuating member 74 only increases the volume of the body 1, not practicality.

An objective of at least preferred embodiments of the present invention is to offer a tool driver which is capable of having the torque of the tool driver adjusted quickly. In preferred embodiments a user is able to quickly know the torque adjusted conditions by the sounds given out during adjustment so that the user can timely stop IS adjusting work, without a need to test the torque adjusting extent repeatedly.

Viewed from one aspect the present invention provides a tool driver comprising: a main body, a sleeve locking stern, an upper ratchet wheel, a lower ratchet wheel, a compression spring and an adjusting member, wherein the main body is provided with a sleeve chamber and an upper cover, an uppcr large opening of thc sleeve chamber has an annular wall disposed with a plurality of lengthwise recesses and engaging members, and a non-circular reinforcing circumference is disposed below said lengthwise recesses and engaging members, said upper cover is formed with a combination groove for setting the sleeve chamber, the inner wall of the combination groove is disposed with a plurality of opposite engaging grooves for matching said engaging members of the sleeve chamber to be respectively engaged therein to cause the upper cover and the sleeve chamber to be combined together, and the opening of said combination groove has a notch for matching said non-circular reinforcing circumference of the sleeve chamber to increase the anti-torsion strength between the sleeve chamber and the upper cover.

In accordance with at least preferred embodiments, the sleeve of this invention has an outer wall provided with a plurality of lengthwise projecting edges to be respectively fixed in the lengthwise recesses of the sleeve chamber, said sleeve has an inner wall formed with a plurality of lengthwise recesses and has its inner wall provided with female threads, said sleeve has its topside disposed with a plurality of positioning serrations respectively formed with an upright face, a slanting face and a top plane section to form a trapezium structure and said top plane section is formed between the upright face and the slanting face, so that using the top plane section of said trapezium positioning serrations can reduce the amount of bending deformation of curved extension portions at the time of a positioning projection being actuated to move on the positioning serrations of the sleeve and to prevent curved extension portions of a positioning projection fracturing due to over-bending.

In accordance with at least preferred embodiments, the adjusting member of this invention is intcgrally formed, said adjusting member being formed with male threads to he threadably combined with the female threads of the sleeve, said male threads bored with a central through insert hole for the locking stem to be inserted therethrough and having its topside provided with a plurality of curved extension portions respectively having an outer side bent downward to form a positioning projection to move on and engage with the positioning serrations of the sleeve, the bottom of said central through insert hole of the integral structure of the adjusting member being provided with a guiding circumference for the locking stein to be inserted therethrough in advance to allow the adjusting member to be screwed on the sleeve in an accurate place.

In accordance with at least preferred embodiments, the male threads of the adjusting member and the female threads of sleeve are trapezium threads to increase the thickness and supporting force of threads and to prevent the male threads and female threads from deforming or dislocating by inaccurate screwing.

Embodiments of the invention will now he described, by way of example only, with reference to the accompanying drawings, wherein: Fig. 1 is a partial exploded perspective view of a tool driver in accordance with a first embodiment of the present invention; Fig. 2 is another partial exploded perspective view of the tool driver shown in Fig. 1; Fig. 3 is an exploded perspective view of the tool driver of the first embodiment of the present invention; Fig. 4 is an upper view of the tool driver of the first embodiments of the present invention; Fig. S is a cross-section view of the first embodiment of the present invention; Fig. 6 is an upper view of an adjusting member in the first embodiment of the present invention; Fig. 7 is a cross-section view of the line A-A in Fig. 6; Fig. 8 is an exploded perspective view of the tool driver of a second embodiment of the present invention; Fig. 9 is a cross-section view of the second embodiment of the present invention; Fig. 10 is an upper view of a sleeve in the second embodiment of the present invention; Fig. 11 is a cross-section view of the line B-B in Fig. 10; Fig. 12 is an upper view of an adjusting member in the second embodiment of the present invention; Fig. 13 is a cross-section view of the line C-C in Fig. 12; Fig. 13 is a cross-section view of the sleeve and the adjusting member in the second embodiment of the present invention; and Fig. 1 5 is a perspective view of the tool driver of second embodiment of the present invention, A first preferred embodiment of a tool driver in accordance with the present invention, as shown in Figs. 1-7, includes a main body 1, a sleeve 2, a locking stem 3, an upper ratchet wheel 4, a lower ratchet wheel 5, a compression spring 6 and an adjusting member 7 as main components combined together.

The main body I is provided with a sleeve chamber 10 formed with an upper large opening 100 and a lower small opening 101 for matching with the shape of the sleeve 2, The upper large opening 100 of the sleeve chamber 10 has its annular wall disposed with a plurality of lengthwise recesses 102 and engaging members 103, and a non-circular reinforcing circumference 104 (a portion having a non-circular circumference) is disposed below said lengthwise recesses 102 and engagc members 103. Said main body 1 is provided with a upper cover I I formed with a combination groove for setting the sleeve chamber 10 (a groove for locating the sleeve chamber relative to the cover so as to combine them), and the inner wall of the combination groove 110 is disposed with a plurality of opposite engaging grooves 111 for matching said engaging members 103 of the sleeve chamber 1 0 to be respectively engaged therein to have the upper cover 11 and the sleeve chamber completely combined together. The opening of said combination groove 110 has a notch 112 for matching said non-circular reinforcing circumference 104 of the sleeve chamber 10 to increase the anti-torsion strength between the sleeve chamber 10 and the upper cover 11.

The sleeve 2 has an outer wall provided with a plurality of lengthwise projecting edges 20 to be respectively fixed in the lengthwise recesses 102 of the sleeve chamber 10 for combining the sleeve 2 together with the sleeve chamber 10 and to prevent the sleeve 2 from being rotated inside the sleeve chamber 10. The sleeve 2 is formed with a comparatively large upper opening 21 and a comparatively small lower opening 22 for other members to be mounted or inserted therein. The sleeve 2 has its inner wall formed with a plurality of lengthwise recesses 23 for lengthwise combination projections 41 of the upper ratchet wheel 4 to be respectively engaged with to enable the upper ratchet wheel 4 and the sleeve 2 to be operated together. The sleeve 2 further has its inncr wall provided with female threads 24 to be screwed and locked with the adjusting member 7 for restricting the locking torque of the tool driver. Furthermore, the sleeve 2 has its topside disposed with a plurality of positioning serrations 25 respectively formed with an upright face 250, a slanting face 251 and a top plane section 252 to form a trapezium structure, said top plane section 252 formed between the upright face 250 and the slanting face 251, so that the positioning serrations 25 of the sleeve 2 can be correspondingly opcrated with positioning projections 73 of the adj Listing member 7 conveniently. The sleeve 2 is also provided with a member chamber 26 for receiving the locking stein 3, the upper ratchet wheel 4, the lower ratchet wheel 5, the compression spring 6 and the adjusting member 7 therein.

The locking stem 3 is formed with a non-circular stem portion (for example hexagon or polygon) having a C-shaped retaining recess 31 for a C-shaped retainer 32 to be clasped therein for restrictedly positioning the locking stem 3 and to prevent the locking stem 3 displacing out of the tool driver. The locking stem 3 is formed with a lower locking end 33, which can be blade-shaped, cross-shaped, hexagonal-shaped or star-shaped.

The upper ratchet wheel 4 is bored with a through insert hole in the center for the setting the lower ratchet wheel 5 to be inserted therethrough and has its outer wail disposed with a plurality of lengthwise combination projections 41 to be respectively fitted in the recesses 23 at the inner wall of the sleeve 2, letting the upper ratchet wheel 4 be restricted or restrained by the sleeve 2 and to be impossible to rotate. The upper ratchet wheel 4 has its lower end provided with one-way serrations 42 for matching with the operation of the lower ratchet wheel 5.

The lower ratchet wheel 5 is bored with a through insert hole for the non-circular stem portion 30 of the locking stem 3 to be H inserted therethrough for firmly combining the lower ratchet wheel together with the stem portion 30 of the locking stem 3, letting the lower ratchet wheel 5 be operated together with the locking stem 3.

The lower ratchet wheel 5 is formed with a comparatively large circumference 51 having its upper surface disposed with one-way serrations 52 to be meshed with the one-way serrations 42 of the upper ratchet wheel 4, to let the one-way serrations 52 of the lower ratchet wheel 5 and the one-way serrations 42 of the upper ratchet wheel 4 be completely meshed or be unidirectionally rotated.

The compression spring 6 is installed between the upper side of the upper ratchet wheel 4 and the adjusting member 7 for the locking stem 3 to be inserted therethrough.

The adjusting member 7 is formed with male threads 70 to be threadably combined with the female threads 24 of the sleeve 2 so that the size of torque can be changed by regulating the combination position of the adjusting member 7 with the sleeve 2. Said male threads 70 and said female threads 24 can he the trapezium threads to increase the thickness and supporting force of threads and to prevent the male threads 70 and female threads 24 from deforming or dislocating by inaccurate screwing. The adjusting member 7 is bored with a central through insert hole 71 for the locking stem 3 to be inserted therethrough and has its topside provided with a plurality of curved extension portions 72 respectively having an outer side bent downward to form a positioning projection 73 with an arcuate end 730, so that the positioning projection 73 of the adjusting member 7 can be operated together with the positioning serrations 25 of the sleeve 2. Thus, a user can easily turn around the adjusting member 7 with fingers or other tool to change the force with which the adjusting member 7 presses the compression spring 6 for deciding the pressure that the compression spring 6 presses on both the upper ratchet wheel 4 and the lower ratchet whee' 5 and further deciding the strength of the torque. And using the top plane section 252 of said trapezium positioning serrations 25 can reduce the amount of bending deformation of curved extension portions 72 at the time said positioning projection 73 is actuated to move on the positioning serrations 25 of sleeve 2 and to prevent the curved extension portions 72 fracturing due to over-bending. Ii

A second preferred embodiment of a tool driver in accordance with the present invention, as shown in Figs. 8-15, includes a main body 1, a sleeve 2, a locking stem 3, an upper ratchet wheel 4, a lower ratchet wheel 5, a compression spring 6 and an adjusting member 7 as main components combined together.

The main body 1 is providcd with a sleeve chamber 10 formed with an upper large opening 100 and a lower small opening 101 for matching with the shape of the sleeve 2. The upper large opening of the sleeve chamber 10 has its annular wall disposed with a plurality of lengthwise recesses 102 and engaging members 103, and a non-circular reinforcing circumference 104 is disposed below said lengthwise recesses 102 and engaging members 103, Said main body 1 is provided with an upper cover 11 formed with a combination groove 110 for setting the sleeve chamber 10, and the inner wall of the combination groove 110 is disposed with a plurality of opposite engaging grooves 111 for matching said engaging members 103 of the sleeve chamber 10 to be respectively engaged therein to have the upper cover 11 and the sleeve chamber completely combined together. The opening of said combination groove 110 has a notch 112 for matching said non-circular reinforcing circumference 104 of the sleeve chamber 10 to increase the anti-torsion strength between the sleeve chamber 10 and the upper cover 11.

The sleeve 2, as shown in Figs. 10 and 1 l which is integrally formed and has an outer wall provided with a plurality of lengthwise projecting edges 20 to be respectively fixed in the lengthwise recesses 102 of the sleeve chamber 10 for combining the sleeve 2 together with the sleeve chamber 10 and to prevent the sleeve 2 from being rotated inside the sleeve chamber 10. The sleeve 2 is formed with a comparatively large upper opening 21 and a comparatively small lower opening 22 for other members to be mounted or inscrted therein. The sleeve 2 has its inner wall formed with a plurality of lengthwise recesses 23 for lengthwise combination projections 41 of the upper ratchet wheel 4 to be respectively engaged with to enable the upper ratchet wheel 4 and the sleeve 2 to be operated together. The sleeve 2 further has its inner wall provided with female threads 24 to be screwed and locked with the adjusting member 7 for restricting the locking torque of the tool driver. Furthermore, the sleeve 2 has its topside disposed with a plurality of positioning serrations 25 respectively formed with an upright face 250, a slanting face 251 and a top plane section 252 to form a trapezium structure, said top plane section plane 252 formed between the upright face 250 and the slanting face 251, so that thc positioning serrations 25 of the sleeve 2 can be correspondingly operated with positioning projections 73 of the adjusting member 7 conveniently. The sleeve 2 is also provided with a member chamber 26 for receiving the locking stem 3, the upper ratchet wheel 4, the lower ratchet wheel 5, the compression spring 6 and the adjusting member 7 therein.

The locking stern 3 is formed with a non-circular stem portion 30 (for example hexagon or polygon) having a C-shaped retaining recess 31 for a C-shaped retainer 32 to be clasped therein for restrictedly positioning the locking stcm 3 and to prevent the [3 locking stem 3 displacing out of the tool driver. The locking stem 3 H is formed with a lower locking end 33, which can be blade-shaped, cross-shaped, hexagonal-shaped or star-shaped.

The upper ratchet wheel 4 is bored with a through insert hole 40 in the center for the setting the lower ratchet wheel S to be inserted therethrough and has its outer wall disposed with a plurality of lengthwise combination projections 41 to be respectively fitted in the recesses 23 at the inner wall of the sleeve 2, letting the upper ratchet wheel 4 be restricted by the sleeve 2 and be impossible to rotate, The upper ratchet wheel 4 has its lower end provided with one-way serrations 42 for matching with the operation of the lower ratchet wheel 5.

The lower ratchet wheel 5 is bored with a through insert hole for the non-circular stern portion 30 of the locking stem 3 to be inserted therethrough for firmly combining the lower ratchet wheel together with the stem portion 30 of the locking stem 3, letting the lower ratchet wheel 5 be operated together with the locking stem 3.

The lower ratchet wheel 5 is formed with a comparatively large circumference 51 having its upper surface disposed with one-way H serrations 52 to be meshed with the one-way serrations 42 of the upper ratchet wheel 4, to let the one-way serrations 52 of the lower ratchet wheel 5 and the one-way serrations 42 of the upper ratchet wheel 4 be cornp!etely meshed or be unidirectionally rotated.

The adjusting member 7, as shown in Figs. 12 and 13, which is integrally formed, and sleeve 2 can be made from plastic to reduce both weight, manufacturing cost and the friction between them. Said adjusting member 7 is formed with male threads 70 to be threadably combined with the female threads 24 of the sleeve 2 so that the size of torque can be changed by regulating the combination position of the adjusting member 7 with the sleeve 2. Said male threads 70 and said female threads 24 can be trapezium threads to increase the thickness and supporting force of threads and to prevent the male threads 70 and female threads 24 from dcforming or dis'ocating by inaccurate screwing (as shown in Fig. 13 and 14), The adjusting member 7 is bored with a central through insert hole 71 for the locking stein 3 to be insertcd therethrough and has its topside provided with a plurality of curved extension portions 72 respectively having an outer side bent downward to form a positioning projection 73 with an arcuate end 730, 50 that the positioning projection 73 of the adjusting member 7 can be operated together with the positioning serrations 25 of the sleeve 2. Thus, a user can easily turn around the adjusting member 7 with fingers or other tool to change the forcc with which the adjusting member 7 presses the compression spring 6 for deciding the pressure that the compression spring 6 presses on both the upper ratchet wheel 4 and the lower ratchet wheel 5 and further deciding the strength of the torque. And using the top plane section 252 of said trapezium positioning serrations 25 can reduce the amount of bending deformation of curved extension portions 72 at the time said positioning projection 73 is actuated to move on the positioning serrations 25 of sleeve 2 and to prevent the curved extension

IS

portions 72 fracturing due to over-bending. Furthermore, the bottom of the central through insert hole 71 of the integrative structure of the adjusting member 7 is provided with a guiding circumference 74 for the locking stem 3 to be inserted therethrough in advance to let the adjusting member 7 be screwed on the sleeve 2 in an accurate place, so that the dislocation or sticking problems of the adjusting member 7 and sleeve 2 in the assembly process can be solved by the guiding circumference 74 of adjusting member 7.

To assemble aforesaid members of the first embodiment and second embodiment together, referring to Figs. 3, 5, 8 and 9, firstly, the C-shaped retainer 32 is clasped in the C-shaped retaining recess 31 of the locking stem 3 and the lower ratchet wheel 5, the upper H ratchet wheel 4 and the compression spring 6 are orderly fitted on the upper portion of the locking stem 3 and then set all the aforesaid members are set in the member chamber 26 of the sleeve 2. Next, the combination projections 41 of the upper ratchet wheel 4 are respectively engaged with the inner recesses 23 of the sleeve 2, H letting the upper ratchet wheel 4 be restricted by the sleeve 2 and actuated to operate together with the sleeve 2 and then, the adjusting member 7 is threadably combined together with the sleeve 2. Thus, a user is able to rotate the adjusting member 7 by turning the extension portions 72 of the adjusting member 7 and at this time, the positioning projections 73 of the adjusting member 7 will be actuated to move on the positioning serrations 25 of the sleeve 2 and give out sounds by which the user is able to know a torque limiting extent preset, without a need to employ any external tool and is able to carry out torque adjustment quickly and accurately. Lastly, the foresaid members are combined together with the main body 1 and the upper cover 11 is covered on the topside of the main body 1 to finish assembly of the tool driver and meanwhile adjust the torque properly.

When employing the tool driver of the illustrated embodiments of this invention to adjust the inner screw of a golf e]ub head, as shown in Fig. S and 9, a user can turn the tool driver within a desired range of torque and have the locking stem 3 locking the screw of the golf club head. But, when the torque of the tool driver is adjusted to an extent exceeding a torque value preset, the upper ratchet wheel 4 will produce a moving-up force to squeeze the compression spring 6, letting the upper ratchet wheel 4 disengage from the lower ratchet wheel 5 and thus, the lower ratchet wheel 5 and the locking stem 3 will be disconnected from the driving power of the upper ratchet wheel 4. In this case, even if the user turns around the tool driver to drive the main body 1 and the sleeve 2 to rotate continuously, the locking stem 3 and the lower ratchet wheel S will be kept in a non-rotation condition, able to protect the locked screw of the golf club head and avoid influencing ball striking equilibrium of the golf club head.

While preferred embodiments of the invention have been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the scope of the invention.

Claims

CLAIMS: 1, A tool driver comprising a main body, a sleeve, a locking stem, an upper ratchet wheel, a lower ratchet wheel, a compression spring and an adjusting member, wherein s said main body is formed with a sleeve chamber for receiving a sleeve thcrcin, an upper opening of said sleeve chamber has an annular wall disposed with a plurality of lengthwise reccsses and engaging members, said main body is provided with an upper cover formed with a combination groove, and an inner wall of the combination groove is disposed with a plurality of opposite engaging grooves for matching said engaging members of the sleeve chamber to be respectively engaged therein to have the upper cover and the sleeve chamber completely combined together; said sleeve has an outer wall provided with a plurality of lengthwise projecting edges to be respectively fixed in the lengthwise recesses of the sleeve chamber, said sleeve has its inner wall formed with a plurality of lengthwise recesses and has its inner wall providcd with female threads, said sleeve has its topside disposed with a plurality of positioning serrations respectively formed with an upright face, a slanting face and a top plane section to form a trapezium structure and said top plane section is formed between the upright face and the slanting face, said sleeve is provided with a member chamber for receiving the locking stem, the upper ratchet wheel, the lower ratchet wheel, the compression spring and the adjusting member therein; said locking stein is formed with a non-circular stem portion, said stem portion cut with a recess for clasping a C-shaped retainer therein, said locking stem provided with a locking end; said upper ratchet wheel is disposed with a central through insert hole for said locking stem to be inserted therethrough, said upper ratchet wheel is provided with a plurality of lengthwise combination projections to be respectively fitted in said recesses of said sleeve, said upper ratchet wheel having a lower end disposed with one-way serrations to be engaged with one-way serrations of said lower ratchet wheel; said lower ratchet wheel is disposed with a through insert hole in the center for said locking stem to be inserted therethrough, said lower ratchet wheel having a lower side formed with a comparatively large circumference provided thereon with one-way serrations, said one-way serrations of said lower ratchet wheel being configured to mesh with said one-way serrations of said upper ratchet wheel; said compression spring is positioned between an upper side of said upper ratchet wheel and said adjusting member for said locking stem to be inserted therethrough, said compression spring producing a force to press engagement of said upper ratchet wheel and said lower ratchet wheel for adjusting locking torque; and said adjusting mcmber is formed with male threads to he threadably combined with the female threads of the sleeve, said male threads bored with a central through insert hole for the locking stem to be inserted therethrough and having its topside provided with a plurality of curved extension portions respectively having an outer side bent downward to form a positioning projection, so that using the top plane section of said trapezium positioning serrations can reduce the amount of bending deformation of said curved extension portions at the time of said positioning projection being actuated to move on the positioning serrations of the sleeve and to prevent the curved extension portions fracturing due to over-bending.
2. The tool driver as claimed in Claim I, wherein a non-circular reinforcing circumference is disposed below said lengthwise recesses and engaging members, and the opening of said combination groove has a notch for matching said non-circular reinforcing circumference of the sleeve chamber to increase the anti-torsion strength between the sleeve chamber and the upper cover.
3. The tool driver as claimed in Claim 1 or 2, wherein said male threads of the adjusting member and said female threads of the sleeve are trapezium threads to increase the thickness and supporting force of the threads and to prevent the male threads and female threads from deforining or dislocating by inaccurate screwing.
4. The tool driver as claimed in Claim 1, 2 or 3 wherein said positioning projection is provided with an arcuate end.
5. A tool driver comprising a main body, a sleeve, a locking stem, an upper ratchet wheel, a lower ratchet wheel, a compression spring and an adjusting member, wherein: said main body is formed with a sleeve chamber for receiving a sleeve therein, an upper opening of said sleeve chamber has an annular wall disposed with a plurality of lengthwise recesses and engaging members, said main body is provided with an upper cover formed with a combination groove, and an inner wall of the combination groove is disposed with a plurality of opposite engaging grooves for matching said engaging members of the sleeve chamber to be respectively engaged therein to have the upper cover and the sleeve chamber completely combined together said sleeve has an outer wall provided with a plurality of lengthwise projecting edges to be respectively fixed in the lengthwise recesses of the sleeve chamber, said sleeve has its inner wall formed with a plurality of lengthwise recesses and has its inner wall provided with female threads, said sleeve has its topside disposed with a plurality of positioning serrations, said sleeve is provided with a member chamber for receiving the locking stem, the upper ratchet wheel, the lower ratchet wheel, the compression spring and the adjusting member therein; said locking stem is formed with a non-circular stem portion, said stem portion cut with a recess for clasping a C-shaped retainer therein, said locking stem provided with a locking end; said upper ratchet wheel is disposed with a central through insert hole for said locking stem to be inserted therethrough, said upper ratchet wheel is provided with a plurality of lengthwise combination projections to be respectively fitted in said recesses of said sleeve, said upper ratchet wheel having a lower end disposed with one-way serrations to be engaged with one-way serrations of said lower ratchet wheel; said lower ratchet wheel is disposed with a through insert hole in the center for said locking stem to be inserted therethrough, said S lower ratchet wheel having a lower side formed with a comparatively large circumference provided thereon with one-way serrations, said one-way serrations of said lower ratchet wheel being configured to mesh with said one-way serrations of said upper ratchet wheel; H said compression spring is positioned between an upper side of said upper ratchet wheel and said adjusting member for said locking stern to be inserted therethrough, said compression spring producing a force to press engagement of said upper ratchet wheel and said lower ratchet wheel for adjusting locking torque; and said adjusting member which is integrally formed, being provided with male threads to be threadably combined with the female threads of the sleeve, said male threads bored with a central through insert hole for the locking stem to be inserted therethrough and having its topside provided with a plurality of curved extension portions respectively having an outer side bent downward to form a positioning projection, the bottom of said central through insert hole of the integral structure of the adjusting member being provided with a guiding circumference for the locking stem to be inserted therethrough in advance to let the adjusting member be screwed on the sleeve in an accurate place.
6. The tool driver as claimed in Claim 5, wherein a non-circular reinforcing circumference is disposed below said lengthwise recesses and engaging members, and the opening of said combination groove has a notch for matching said non-circular S reinforcing circumference of the sleeve chamber to increase the anti-torsion strength between the sleeve chamber and the upper cover.
7. The tool driver as claimed in Claim 5 or 6, wherein said positioning serrations are respectively formed with an upright face, a slanting face and a top plane section to form a trapezium structure and said top plane section is formed between the upright face and the slanting face, so that using the top plane section of said trapezium positioning serrations can reduce the amount of bending deformation of said curved extension portions at the time said IS positioning projection is actuated to move on the positioning serrations of the sleeve and to prevent the curved extension portions fracturing due to over-bending.
8. The tool driver as claimed in Claim 5, 6 or 7, wherein said sleeve and adjusting member are integrally formed of plastic to reduce both weight, manufacturing cost and the friction between them.
9. The tool driver as claimed in any of Claims 5 to 8, wherein said male threads of the adjusting member and said female threads of the sleeve are trapezium threads to increase the thickness and supporting force of the threads and to prevent the male threads and female threads from deforming or dislocating by inaccurate screwing.
10. The tool driver as claimed in any of Claims 5 to 9, wherein said positioning projection is provided with an arcuate end.
11. A tool driver comprising a main body, a sleeve, a locking stem, an upper ratchet wheel, a lower ratchet wheel, a compression spring and an adjusting member, wherein: said main body is formed with a sleeve chamber for receiving a sleeve therein, an upper opening of said sleeve chamber has an annular wall disposed with a plurality of lengthwise recesses and engaging members, said main body is provided with an upper cover formed with a combination groove, and an inner wall of the combination groove is disposed with a plurality of opposite engaging grooves for matching said engaging members of the slccvc chamber to be respectively engaged therein to have thc upper cover is and the sleeve chamber completely combined together; said sleeve has an outer wall provided with a plurality of lengthwise projecting edges to be respectively fixcd in the lengthwise recesses of the sleeve chamber, said sleeve has its inner wall formed with a plurality of lengthwise recesses and has its inner wall provided with female threads, said sleeve has its topside disposed with a plurality of positioning serrations, said sleeve is provided with a member chamber for receiving the locking stem, the upper ratchet wheel, the lower ratchet wheel, the compression spring and the adjusting member therein; said locking stem is formed with a non-circular stem portion, said stem portion cut with a recess for clasping a C-shaped retainer therein, said locking stem provided with a locking end; said upper ratchet wheel is disposed with a central through insert hole for said locking stem to be inserted therethrough, said upper ratchet wheel is provided with a plurality of lengthwise combination projections to be respectively fitted in said recesses of said sleeve, said upper ratchet wheel having a lower end disposed with one-way serrations to be engaged with one-way serrations of said lower ratchet wheel; said lower ratchet wheel is disposed with a through insert hole in the center for said locking stem to he inserted therethrough, said lower ratchet wheel having a lower side formed with a comparatively large circumference provided thereon with one-way serrations, said one-way serrations of said lower ratchet wheel being configured to mesh with said one-way serrations of said upper ratchet wheel; said compression spring is positioned between an upper side of said upper ratchet wheel and said adjusting member for said locking stem to be inserted therethrough, said compression spring producing a force to press engagement of said upper ratchet wheel and said lower ratchet wheel for adjusting locking torque; and said adjusting member is formed with male threads to be threadably combined with the female threads of the sleeve, said male threads bored with a central through insert hole for the locking stem to be inserted therethrough and having its topside provided with a plurality of curved extension portions respectively having an outer side bent downward to form a positioning projection.
12. A tool driver comprising a main body, a sleeve, a locking stem, an upper ratchet wheel, a lower ratchet wheel, a S compression spring and an adjusting member, wherein the main body is provided with a sleeve chamber and an upper cover, an upper large opening of the sleeve chamber has an annular wall disposed with a plurality of lengthwise recesses and engaging members, and a non-circular reinforcing circumference is disposed below said lengthwise recesses and engaging members, said upper cover is formed with a combination groove for setting the sleeve chamber, the inner wall of the combination groove is disposed with a plurality of opposite engaging grooves for matching said engaging members of the sleeve chamber to be respectively engaged therein to cause the upper cover and the sleeve chamber to be combined together, and the opening of said combination groove has a notch for matching said non-circular reinforcing circumference of the sleeve chamber to increase the anti-torsion strength between the sleeve chamber and the upper cover.
13. A tool driver as claimed in claim 12, wherein the sleeve has an outer wall provided with a plurality of lengthwise projecting edges to be respectively fixed in the lengthwise recesses of the sleeve chamber, said sleeve has an inner wall formed with a plurality of lengthwise recesses and has its inner wall provided with female threads, said sleeve has its topside disposed with a plurality of positioning serrations respectively formed with an upright face, a slanting face and a top plane section to form a trapezium structure and said top plane section is formed between the upright face and the slanting face.
14. A tool driver as claimed in claim 12 or 13, wherein the adjusting member is integrally formed and is provided with male threads to be threadably combined with the female thrcads of the sleeve, said male threads bored with a central through insert hole for the locking stem to be inserted therethrough and having its topside provided with a plurality of curved extension portions respectively having an outer side bent downward to form a positioning projection to move on and engage with the positioning serrations of the sleeve, the bottom of said central through insert hole of the integral structure of the adjusting member being provided with a guiding circumference for the locking stern to be inserted therethrough in advance to allow the adjusting member to be screwed on the sleeve in an accurate place.
15. A tool driver as claimed in claim 14, wherein the male threads of the adjusting member and the female threads of sleeve are trapezium threads to increase the thickness and supporting force of threads and to prevent the male threads and fema]e threads from deforming or dislocating by inaccurate screwing.

16, A tool driver substantially as hereinbefore described with reference to the accompanying drawings.