Patent Description:
There are various tools such as box-ended wrenches, open-ended wrenches, adjustable wrenches, Allen keys, socket wrenches and related components. Pressing or printing is often used to provide a tool with an inscription to show a trademark, an aesthetic pattern or the size of the tool.

The use of the above-mentioned processes to make the inscription is not without any problem particularly where the inscription is used to show the size of the tool. For example, a user may have to wipe grease from the tool to read the inscription to know the size of the tool for the inscription is often covered entirely or partially by grease. Moreover, the user may have to flip the tool over to read the inscription since the inscription is often supported on a lower face of the tool in an operative position.

With respect to the basic technological background of the present disclosure, reference is made to document <CIT> showing a micrometer or tension wrench being basically a torque tool, which itself comprises multiple bits; or document <CIT> teaching a conventional torque wrench having a function change arrangement; or document <CIT> showing a hand tool for adjusting torsion; or document <CIT> related to an item for tightening to the correct torque. Furthermore, <CIT> discloses a tool-identifying system in which a color chart shows a range of ten colors and each color indicates a particular numeral. A sequence of indicated numerals represents the value of the size of a tool, in fractional inch or metric size. However, a user has to memorize the correspondence of the colors to the numerals. The user will experience troubles in picking bits of the right sizes might if he or she forgets the correspondence. Accordingly, the user may bring bits of wrong sizes to a working site and fail a task. Alternatively, the user may be forced to bring bits of all sizes to the working site, and this is quite a burden. In operation, the user may pick bits of wrong sizes before getting the bit of the right size, and this is a waste of time.

<CIT> discloses an adjustable wrench including a handle, a jaw formed on the handle, another jaw movably connected to the handle, a scale in fractional inch, and another scale in metric size. Each scale provides the correspondence of the value of each size to an actual with of a gap between the jaws. However, the scales could be covered with grease or steins.

Moreover, no wrench has been provided with anything to let a user know an adequate value of torque to be imposed on a workpiece such as a nut and a threaded bolt without causing damages to the workpiece. Hence, the user might not exert an inadequate value of torque to engage a nut with a threaded bolt so that the nut could easily be disengaged from the threaded bolt because of vibration.

The present invention is therefore intended to obviate or at least alleviate the problems encountered in the prior art.

It is the primary objective of the present invention to provide a torque tool using colors for identification.

To achieve the foregoing objective, there is provided a torque tool set according to claims <NUM> and <NUM>. Moreover, there is also provided a torque tool according to claim <NUM>.

Other objectives, advantages and features of the present invention will be apparent from the following description referring to the attached drawings.

The present invention will be described via detailed illustration of ten embodiments referring to the drawings wherein:.

Referring to <FIG>, a wrench <NUM> includes a bit <NUM> connected to a handle <NUM> according to a first embodiment of the present invention. The handle <NUM> includes a rod <NUM> inserted in a pipe <NUM>. The rod <NUM> is pivotally connected to the pipe <NUM> by a pivot <NUM>. A wheel <NUM> is connected to a rear end of the rod <NUM>, which is inserted in the pipe <NUM>. A joint <NUM> is formed in one piece with a front end of the rod <NUM>, which is located out of the pipe <NUM>. Thus, the joint <NUM> is located out of the pipe <NUM>. The joint <NUM> includes a bore <NUM> in a front end. Two apertures <NUM> are respectively made in two opposite sides of the joint <NUM> so that the apertures <NUM> are in communication with the bore <NUM>. A button <NUM> is inserted in each of the apertures <NUM>. The buttons <NUM> are kept on the joint <NUM> and away from the bore <NUM>.

The handle <NUM> further includes a torque-adjusting mechanism <NUM> including a grip <NUM>, a threaded rod <NUM>, a threaded sleeve <NUM>, a spring <NUM>, a wedge <NUM>, a bearing <NUM>, a connector <NUM> and a controller <NUM>. The spring <NUM> is inserted in the pipe <NUM>. The wedge <NUM> is connected to a front end of the spring <NUM>. Thus, the spring <NUM> abuts the wedge <NUM> against the wheel <NUM>, which is connected to the rod <NUM>.

Referring to <FIG> and <FIG>, the grip <NUM> extends around a rear section of the pipe <NUM> so that the former is allowed to rotate around the latter. The rear section of the pipe <NUM> receives the threaded rod <NUM> and the threaded sleeve <NUM>. The threaded rod <NUM> includes a shank <NUM> supported by the bearing <NUM>, which is fitted in the rear section of the pipe <NUM>. The threaded sleeve <NUM> includes a thread <NUM> formed on an internal face and a groove <NUM> longitudinally made in an external face. The thread <NUM> of the threaded sleeve <NUM> is engaged with a thread (not numbered) of the threaded rod <NUM>. A front end of the threaded sleeve <NUM> is abutted against a spring <NUM> that is inserted in rear section of the pipe <NUM>. A pin <NUM> is inserted in the groove <NUM> via the pipe <NUM> to prevent the threaded sleeve <NUM> from rotation in the pipe <NUM> but allow the threaded sleeve <NUM> to translate in the pipe <NUM>. The pin <NUM> is used to abut against a closed end of the groove <NUM> to set an end for the translation of the threaded sleeve <NUM> in the pipe <NUM>. A positioning collar <NUM> is inserted in the grip <NUM>. Moreover, the positioning collar <NUM> is fitted on the rear section of the pipe <NUM> so that they are not movable relative to each other. Furthermore, the positioning collar <NUM> keeps the pin <NUM> in the pipe <NUM>.

The connector <NUM> is an annular element that is fitted between the grip <NUM> and on the shank <NUM> so that the grip <NUM> is rotatable with the threaded rod <NUM>. The shank <NUM> is inserted in the controller <NUM>, which is an annular element. The controller <NUM> is allowed to translate in the grip <NUM> in a longitudinal direction of the handle <NUM> between a locking position and an unlocking position. In the locking position, the controller <NUM> prevents the grip <NUM> from rotation around the pipe <NUM>. In the unlocking position, the controller <NUM> allows the grip <NUM> to rotate around the pipe <NUM>. Details of the structure of the controller <NUM> and its relation to the other elements are not the spirit of the present invention and hence will not be given here. However, details of the structure of the controller <NUM> and its relation to the other elements can be found in <CIT>.

The handle <NUM> further includes an indicating unit <NUM> including a ring <NUM>, a transparent panel <NUM>, a label <NUM>, a lens <NUM> and a scale ring <NUM>. The ring <NUM> includes a frame <NUM> and a pointer <NUM> on an external face. The pointer <NUM> is a pointed portion of the frame <NUM>. In addition, the ring <NUM> further includes a cavity <NUM> in the frame <NUM> and two apertures <NUM> in communication with the cavity <NUM>. A middle section of the pipe <NUM> is inserted in the ring <NUM>. Two screws <NUM> are inserted in the pipe <NUM> via the apertures <NUM> of the ring <NUM> so that the ring <NUM> is kept in position, next to the positioning collar <NUM>. A unit of torque <NUM> such as Nm is inscribed in or printed on the frame <NUM>, between the pointer <NUM> and the cavity <NUM>.

Preferably, the label <NUM> is a sheet of a proper material inserted in the cavity <NUM>. A transparent panel <NUM> is fitted in the frame <NUM> so that the transparent panel <NUM> keeps the label <NUM> in the cavity <NUM>. The label <NUM> is printed with four colored areas <NUM>, <NUM>, <NUM> and <NUM> for example. Preferably, the label <NUM> is further printed with four numbers 61a, 62a, 63a and 64a respectively located in the colored areas <NUM>, <NUM>, <NUM> and <NUM> to represent four values of torque. The numbers 61a, 62a, 63a and 64a are respectively "<NUM>", "<NUM>", "<NUM>" and "<NUM>" for example. The colored areas <NUM>, <NUM>, <NUM> and <NUM> and the numbers 61a, 62a, 63a and 64a are observable via the transparent panel <NUM>, but not the screws <NUM>.

In another embodiment, the label <NUM> can be a layer of paint, ink or the like coated on a lower face of the transparent panel <NUM>. Thus, the label <NUM> is observable via the transparent panel <NUM>, too. Similarly, the colored areas <NUM>, <NUM>, <NUM> and <NUM> and the numbers 61a, 62a, 63a and 64a are observable via the transparent panel <NUM>, but not the screws <NUM>.

A section of the ring <NUM> is inserted in the scale ring <NUM> so that the scale ring <NUM> is located between the pointer <NUM> and the positioning collar <NUM> in the longitudinal direction of the handle <NUM>. The scale ring <NUM> is allowed to rotate on the ring <NUM>, but not translate on the ring <NUM>. The scale ring <NUM> is formed with teeth <NUM> on an external face. The teeth <NUM> are engaged with teeth <NUM> formed on an internal face of the grip <NUM> so that the scale <NUM> is rotatable with the grip <NUM>.

Referring to <FIG>, four colored areas <NUM>, <NUM>, <NUM> and <NUM> are inserted in a recess <NUM> made in an external face of the scale ring <NUM>, and so is a scale <NUM>. The scale <NUM> is located between the colored areas <NUM> and <NUM>.

The lens <NUM> is an annular element formed with two open ends <NUM> and <NUM>. The lens <NUM> extends around the ring <NUM>. The lens <NUM> includes an internal flange <NUM> inserted in a groove <NUM> made in the external face of the ring <NUM>, thereby keeping the lens <NUM> in position on the ring <NUM> in the longitudinal direction of the handle <NUM>. At the open end <NUM>, the lens <NUM> is formed with a notch <NUM> to receive the pointer <NUM> to prevent the lens <NUM> from rotation on the ring <NUM>. The lens <NUM> extends around and hence protectively covers the scale ring <NUM>. The open end <NUM> of the lens <NUM> is pointed at the grip <NUM>.

Referring to <FIG>, the grip <NUM> is rotated relative to the pipe <NUM> in a sense of direction so that the threaded rod <NUM> translates the threaded sleeve <NUM> toward the bearing <NUM>, thereby reducing the load in the spring <NUM>. For the engagement of the teeth <NUM> with the teeth <NUM>, the scale ring <NUM> is rotated around the ring <NUM> to show the maximum value of torque that can be transferred by the handle <NUM>.

The pointer <NUM> is pointed at the colored area <NUM> of the scale ring <NUM> for example. The color of the colored area <NUM> is identical or similar to the color of the colored area <NUM>. Hence, the maximum value of torque that can be transferred by the handle <NUM> is <NUM> as shown by the number 64a, which is located in the colored area <NUM> of the label <NUM>. In practice, there are inevitably errors in the making of the torque-adjusting mechanism <NUM> so that the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM> when <NUM> is shown.

The maximum value of torque that can be transferred by the handle <NUM> is determined by the load in the spring <NUM>. The wheel <NUM> moves beyond the wedge <NUM>, which is connected to the spring <NUM> to provide a sound when the value of torque transferred by the handle <NUM> reaches the maximum, e.g., <NUM>. Hence, a user knows that the value of torque transferred by the handle <NUM> reaches the maximum.

Referring to <FIG>, <FIG> and <FIG>, the grip <NUM> rotates the threaded rod <NUM> to translate the threaded sleeve <NUM> backward to reduce the load in the spring <NUM>. Due to the engagement of the teeth <NUM> with teeth <NUM>, the scale ring <NUM> is rotated with the ring <NUM> to immediately represent the maximum value of torque that can be transferred by the handle <NUM>.

When the pointer <NUM> is pointed at the colored area <NUM>, it is easily observed that the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM> as shown by the number 63a, which is located in the colored area <NUM> since the color of the colored area <NUM> is identical or similar to the color of the colored area <NUM>. There is no need to memorizing or calculation to know the relation of the colored area <NUM> to the colored area <NUM>.

Referring to <FIG>, <FIG> and <FIG>, the above-described process is repeated to change the maximum value of torque that can be transferred by the handle <NUM>. The pointer <NUM> is pointed at the colored area <NUM> corresponding to the number 62a located in the colored area <NUM>. It is easily observed that the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM> as shown by the number 62a without any need for memorizing or calculation.

Referring to <FIG>, <FIG> and <FIG>, the above-described process is repeated to change the maximum value of torque that can be transferred by the handle <NUM>. The pointer <NUM> is pointed at the colored area <NUM> corresponding to the number 61a located in the colored area <NUM>. It is easily observed that the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM> as shown by the number 61a without any need for memorizing or calculation.

Referring to <FIG> again, the bit <NUM> includes a head <NUM> formed with two stationary jaws <NUM> separated from each other by a distance <NUM>. Each of the stationary jaws <NUM> is formed with a contact face <NUM> so that the contact faces <NUM> of the stationary jaws <NUM> extend parallel to each other. The head <NUM> includes a raised portion <NUM> formed on an upper face and an insert <NUM> extending backward from the raised portion <NUM>. The insert <NUM> includes a recess (<FIG>) in a lower face to receive a spring <NUM> and a ball <NUM>. The spring <NUM> is compressed between a closed end of the recess of the insert <NUM> and a first portion of the ball <NUM> so that a second portion of the ball <NUM> extends from the insert <NUM> via an open end of the recess of the insert <NUM>. The first portion of the ball <NUM> is kept in the recess of the insert <NUM>. A colored layer <NUM> covers an upper face of the raised portion <NUM> of the bit <NUM> and an upper face of the insert <NUM>. An identification symbol <NUM> is supported on the upper face of the raised portion <NUM> of the bit <NUM>. The symbol <NUM> shows "<NUM>.

Referring to <FIG> and <FIG>, the insert <NUM> is inserted in the bore <NUM>. The second portion of the ball <NUM> pushes a first portion of a selected one of the buttons <NUM> into a selected one of the apertures <NUM> so that the second portion of the ball <NUM> enters the selected aperture <NUM> to keep the insert <NUM> in the bore <NUM>. Now, a second portion of the selected button <NUM> sticks out of the selected aperture <NUM>.

When the second portion of the selected button <NUM> is pushed in the selected aperture <NUM>, the first portion of the button <NUM> pushes the second portion of the ball <NUM> out of the selected aperture <NUM> to allow movement of the insert <NUM> from the bore <NUM>. Then, the bit <NUM> can be replaced with another bit.

The bit <NUM> including the stationary jaws <NUM> is in the form of a head of an open-ended wrench. Thus, the combination of the bit <NUM> with handle <NUM> becomes an open-ended wrench <NUM>.

In operation, the contact faces <NUM> of the stationary jaws <NUM> are expected to contact two opposite facets of a workpiece such as a nut or a head or a threaded bolt. The workpiece cannot be located between the stationary jaws <NUM> if the distance between the opposite facets of the workpiece is larger than the distance between the contact faces <NUM> of the stationary jaws <NUM>. The opposite facets of the workpiece cannot be in proper contact with the contact faces <NUM> of the stationary jaws <NUM> if the distance between the opposite facets of the workpiece is excessively smaller than the distance between the contact faces <NUM> of the stationary jaws <NUM>. That is, the bit <NUM> is only useful for rotating a workpiece in a size.

Referring to <FIG> and <FIG>, the identification symbol <NUM> is located in the colored layer <NUM>. The color of the colored layer <NUM> is identical or similar to the color of the colored area <NUM>, and the color of the colored area <NUM> is identical or similar to the color of the fourth colored area <NUM>. Hence, it is obvious that the scale ring <NUM> should be rotated to align the colored area <NUM> of the scale ring <NUM> with the pointer <NUM> so that the maximum value of torque that can be transferred by the handle <NUM> is set to be <NUM>±<NUM> when the bit <NUM> of <NUM> is used. There is no need for memorizing or calculation.

Referring to <FIG> and <FIG>, there is a wrench according to a second embodiment of the present invention. The second embodiment is like the first embodiment except for two things. Firstly, a colored layer <NUM> is supported on the head <NUM> instead of the colored layer <NUM> supported on the raised portion <NUM> of the bit <NUM>. Secondly, an identification symbol <NUM> is supported on the raised portion <NUM> of the bit <NUM> instead of the identification symbol <NUM>. The symbol <NUM> shows "<NUM>. " The color of the colored layer <NUM> is identical or similar to the color of the colored area <NUM>, and the color of the colored area <NUM> is identical or similar to the color of the fourth colored area <NUM>. Hence, it is obvious that the scale ring <NUM> should be rotated to align the colored area <NUM> of the scale ring <NUM> with the pointer <NUM> so that the maximum value of torque that can be transferred by the handle <NUM> is set to be <NUM>±<NUM> when the bit <NUM> of <NUM> is used. There is no need for memorizing or calculation.

Referring to <FIG> and <FIG>, there is a wrench according to a third embodiment of the present invention. The third embodiment is like the first embodiment except for two things. Firstly, a colored layer <NUM> is supported on the raised portion <NUM> of the bit <NUM>. Secondly, an identification symbol <NUM> is supported on the raised portion <NUM> of the bit <NUM> instead of the identification symbol <NUM>. The symbol <NUM> shows "<NUM>. " The color of the colored layer <NUM> is identical or similar to the color of the colored area <NUM>, and the color of the colored area <NUM> is identical or similar to the color of the fourth colored area <NUM>. Hence, it is obvious that the scale ring <NUM> should be rotated to align the colored area <NUM> of the scale ring <NUM> with the pointer <NUM> so that the maximum value of torque that can be transferred by the handle <NUM> is set to be <NUM>±<NUM> when the bit <NUM> of <NUM> is used. There is no need for memorizing or calculation.

Referring to <FIG> and <FIG>, there is a wrench according to a fourth embodiment of the present invention. The fourth embodiment is like the first embodiment except for two things. Firstly, a colored layer <NUM> is supported on the head <NUM> and the raised portion <NUM> of the bit <NUM> instead of the colored layer <NUM> supported on the raised portion <NUM> of the bit <NUM>. Secondly, an identification symbol <NUM> is supported on the raised portion <NUM> of the bit <NUM> instead of the identification symbol <NUM>. The symbol <NUM> shows "<NUM>. " The color of the colored layer <NUM> is identical or similar to the color of the colored area <NUM>, and the color of the colored area <NUM> is identical or similar to the color of the fourth colored area <NUM>. Hence, it is obvious that the scale ring <NUM> should be rotated to align the colored area <NUM> of the scale ring <NUM> with the pointer <NUM> so that the maximum value of torque that can be transferred by the handle <NUM> is set to be <NUM>±<NUM> when the bit <NUM> of <NUM> is used. There is no need for memorizing or calculation.

A color coding is shown in a table as follows:.

The bits <NUM> according to the first to fourth embodiments are sorted in a group because they are all in the form of a head of an open-ended wrench and because each of them is formed with the insert <NUM> for engagement with the joint <NUM> of the handle <NUM>. However, they bear different colored layers and symbols corresponding to different values of the distance between the contact faces <NUM> of the stationary jaws <NUM>. Thus, they are operable to exert different maximum values of torque on workpieces in different sizes.

Referring to <FIG>, there is shown a bit 11a according to fifth embodiment of the present invention. The bit 11a is in the form of a head of an adjustable wrench. The bit 11a is formed with the insert <NUM> for engagement with the joint <NUM> of the handle <NUM>.

The bit 11a includes a head 12a, a stationary jaw 13a formed in one piece with the head 12a, and a movable jaw 14a movably connected to the head 12a. The head 12a includes a groove 29a in communication with an opening 19a. The movable jaw 14a is formed with a rack 16a. The rack 16a is movably inserted in the groove 29a. A worm 18a is rotationally inserted in the opening 19a. The worm 18a is engaged with the rack 16a so that the worm 18a is rotated to move the rack 16a in the groove 29a in operation. Accordingly, the movable jaw 14a is moved relative to the stationary jaw 13a.

The bit 11a includes colored layers 20a, 21a, 22a and 23a respectively connected to identification symbols 24a, 25a, 26a and 27a. The movable jaw 14a is provided with a pointer 28a in the form of a triangle or arrow head for alignment with one identification symbols 24a, 25a, 26a and 27a. The colored layer 20a and the identification symbol 24a are in a same color. The colored layer 21a and the identification symbol 25a are in a same color. The colored layer 22a and the identification symbol 26a are in a same color. The colored layer 23a and the identification symbol 27a are in a same color. The colored layers 20a, 21a, 22a and 23a are in different colors corresponding to the colored layers <NUM>, <NUM>, <NUM> and <NUM>.

Referring to <FIG>, there is a bit 11b according to a sixth embodiment of the present invention and a bit 11c according to a seventh embodiment of the present invention.

The bit 11b is like the bit <NUM> except for including a C-shaped head 12b instead of the head <NUM>. The head 12b includes two arched jaws (not numbered) each of which includes a free end so that the free ends of the jaws of the head 12b are separated from each other by a distance 15b. The head 12b includes contact facets 14b arranged like a star instead of the contact faces <NUM>. For example, a colored layer 20b is supported on an upper face of the head 12b. According to the color coding, the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM> when the handle <NUM> is used with the bit 11b.

The bit 11c is like the bit 11b except for including an annular head 12c instead of the C-shaped head 12b. The head 12b includes contact facets 14c arranged like a star. For example, a colored layer 21b is supported on an upper face of the head 12c. According to the color coding, the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM> when the handle <NUM> is used with the bit 11c.

Referring to <FIG> and <FIG>, there is shown a torque tool according to an eighth embodiment of the present invention. The eighth embodiment is like the first embodiment except that the scale ring <NUM> does not include any colored area. In operation, the scale ring <NUM> is rotated to align the pointer <NUM> with a value on the scale <NUM> according to the number 61a, 62a, 63a or 64a.

Referring to <FIG> and <FIG>, there is shown a torque tool according to a ninth embodiment of the present invention. The ninth embodiment is like the first embodiment except for including a block <NUM> instead of the indicating unit <NUM>. The block <NUM> is in the form of a triangle or arrow head. The pointer <NUM> is a pointed portion of the block <NUM>. In use, the scale ring <NUM> is rotated to align the colored area <NUM>, <NUM>, <NUM> or <NUM> with the pointer <NUM> according to the colored layer <NUM>, <NUM>, <NUM> or <NUM>. For example, the colored area <NUM> is aligned with the pointer <NUM> according to the colored layer <NUM> of the bit <NUM>. Hence, the maximum value of torque that can be transferred by the handle <NUM> is <NUM>±<NUM>.

Referring to <FIG> and <FIG>, there is shown a torque tool according to a tenth embodiment of the present invention. The tenth embodiment is like the first embodiment except for several things. Firstly, the tenth embodiment is a screw driver 10a, not a wrench <NUM>.

Secondly, the screw driver 10a includes a bit 11d instead of the bit <NUM>. The bit 11d is in the form of a screw driver without a grip. The bit 11d includes cruciform tip <NUM> at an end, a socket <NUM> at an opposite end, and a non-circular bore <NUM> in the socket <NUM>. The bit 11d includes a middle section provided with a colored layer <NUM> for example.

Thirdly, the screw driver 10a includes a handle 30a instead of the handle <NUM>. The handle <NUM> includes a grip 41a, a non-circular insert <NUM> extending from a front end of the grip 41a, and a spring-biased ball <NUM> supported on the non-circular insert <NUM>. The non-circular insert <NUM> is inserted in the non-circular bore <NUM> to connect the handle 30a to the bit 11d. The ball <NUM> abuts against a wall of the non-circular bore <NUM> to keep the bit 11d on the handle 30a.

Fourthly, the grip 41a includes a knob 49a provided at a rear end. The knob 49a is a component of the controller <NUM>. A non-movable lens 70a is provided between the knob 49a and the grip 41a. The lens 70a protectively covers a scale ring 80a.

Fifthly, the grip 41a is formed with a recess <NUM> instead of the frame <NUM>. The pointer <NUM> is a pointed portion of the recess <NUM>. The pointer <NUM> extends toward the scale ring 80a.

Sixthly, the label <NUM> includes an additional colored area <NUM> and a number 65a located in the colored area <NUM>. Similarly, the number 65a represents a maximum value of torque transferable via the handle 30a.

Seventhly, a scale ring 80a is used instead of the scale ring <NUM>. The scale ring 80a is like the scale ring <NUM> except for including an additional colored area <NUM>. Moreover, each of the colored areas <NUM>, <NUM>, <NUM>, <NUM> and <NUM> is provided with a number to represent a maximum value of torque that can be transferred by the handle 30a.

Claim 1:
A torque tool set, comprising:
multiple bits (<NUM>) each of which comprises a colored area;
a handle (<NUM>) for connection to a selected one of the bits (<NUM>), wherein the handle (<NUM>) is operable to set multiple maximum values of torque transferable to the bit (<NUM>) from the handle (<NUM>) corresponding to the colored areas of the bits (<NUM>);
a label (<NUM>) supported on the handle (<NUM>), wherein the label (<NUM>) comprises multiple colored areas (<NUM>, <NUM>, <NUM>, <NUM>) corresponding to the colored areas of the bits (<NUM>) and multiple numbers (61a, 62a, 63a, 64a) located in the colored areas (<NUM>, <NUM>, <NUM>, <NUM>) of the label (<NUM>) corresponding to the maximum values of torque;
a pointer (<NUM>) formed on the handle (<NUM>); and
a scale ring (<NUM>) rotated around the handle (<NUM>) as the handle (<NUM>) is operated to set the maximum values of torque, thereby aligning the pointer (<NUM>) with a value on the scale ring (<NUM>) according to one of the numbers (61a, 62a, 63a, 64a) in a corresponding one of the colored areas (<NUM>, <NUM>, <NUM>, <NUM>) of the label (<NUM>) corresponding to the colored area of a selected one of the bits (<NUM>).