GB2378144A

GB2378144A - Keyless Chuck

Info

Publication number: GB2378144A
Application number: GB0221161A
Authority: GB
Inventors: Stephen W Steadings; William C Buck; Christopher B Barton
Original assignee: Power Tool Holders Inc
Current assignee: Power Tool Holders Inc
Priority date: 1998-06-05
Filing date: 1999-06-04
Publication date: 2003-02-05
Anticipated expiration: 2019-06-04
Also published as: GB0221161D0; GB2377193B; GB0221164D0; GB2377193A; GB2378144B

Abstract

A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom is provided. The chuck includes a generally cylindrical body member having a nose section and a tail section. Each of a plurality of jaws is slidably positioned in one of a plurality of angularly disposed passageways in the body. Each jaw has a jaw face formed on one side thereof and threads formed on the opposite side thereof. A nut is rotatably mounted on the body in engagement with the jaw threads so that rotation of the nut moves the jaws axially within the passageways. A locking member, in a first axial position, is rotatable with respect to the driver housing. In a second axial position, it operatively engages the housing and the nut so that the locking member is rotationally held to the housing and the nut so that the nut is rotationally held to the housing. The locking member is axially reciprocal between the first axial position and the second axial position. The chuck may also include a clutch mechanism.

Description

1; 2378 1 44

ATTORNEY DOCKET NO.: JCM- 2 1 S

LOCKING CHUCK

Background of the Invention

The present invention relates generally to chucks for use with drills or with electric or pneumatic 5 power drivers. More particularly, the present invention relates to a chuck of the Joyless type which may be tightened or loosened by hand.

Both hand and electrical or pneumatic tool drivers are well known. Although twist drills are the 10 most common tools on such drivers, the tools may also comprise screw drivers, nut drivers, burrs, mounted grinding stones, and other cutting ox abrading tools.

Since the tool shank may be of varying diameter or of polygonal cross section, the device is usually 15 provided with a chuck that is adjustable over a relatively wide range. The chuck may be attached to the driver by a threaded or tapered bore or any other suitable means.

A variety of chuck types have been developed that 20 are actuated by relative rotation between a chuck body and an annular nut. In a typical oblique jawed chuck, for example, a body member includes three passageways disposed approximately 120 apart from each other.

The passageways are configured so that their center 25 lines meet at a point along the chuck axis forward of the chuck body. Three jaws are constrained by and movable in the passageways to grip a cylindrical tool shank disposed approximately along the chuck center axis. The nut rotates about the chuc. 's center and 30 engages threads on the jaws so that rotation of the nut moves the jaws in either direction in the passageways. The body and rut are cc figured so that rotation of the nut in one irection (the closing direction) with respect to -he body forces the jaws

i into gripping relationship with the tool shank, while rotation in the opposite direction (the opening direction) releases the gripping relationship. Such a chuck may be keyless if it is rotated by hand.

5 Examples of such chucks are disclosed in U.S. Patents 5,125,673 and 5, 193,824, commonly assigned to the present assignee and the entire disclosure of each of

which is incorporated by reference herein. Various configurations of keyless chucks are known in the art 10 and are desirable for a variety of applications.

Keyless chucks actuated by relative rotation between a nut and a chuck body include means to control the rotational position of the nut and the body For example, a first sleeve may be provided in 15 communication with the nut while a second sleeve, which is independent of the first sleeve, may be attached to the body. Thus, a user may rotate the first sleeve with one hand while gripping the second sleeve with the other hand, thereby holding the body 20 still. Alternatively, in some devices in which only a single sleeve is provided, G user may grip the single sleeve and actuate the tool driver to rotate the spindle, thereby rotating the chuck body with respect to the sleeve. In addition, a mechanism may be 25 located in a driver to lock -he spindle of the driver when the driver is not actuated, thus enabling use of a single sleeve chuck.

Summary of the Invention

The present invention recognizes and addresses 30 the foregoing considerations, and others, of prior art

constructions and methods.

Accordingly, it is an -eject of the present invention to provide an improved chuck.

It is a further object or the present invention 35 to provide an improved drill

( It is a still further object of the present invention to provide a chuck having an improved mechanism for loosening and tightening the chuck.

These and other objects are achieved by a chuck 5 for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom. The chuck includes a generally cylindrical body member having a nose section and a tail section.

The tail section is configured to mate with the drive 10 shaft so that the body rotates with the drive shaft.

The nose section has an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting the axial bore. Each or a plurality of jaws is slidably positioned in one of 15 the annularly disposed passageways. Each of the jaws has a jaw face formed on one side thereof and threads formed on the opposite side thereof. A nut is rotatably mounted on the Lody in engagement with the threads on the jaws so that rotation of the nut moves 20 the jaws axially within the passageways. A locking member is, in a first axial position, rotatable with respect to the driver housing. In a second axial position, it operatively engages the housing and the nut so that the locking member is rotationally held to 25 the housing and to the nut so that the nut is rotationally held to the housing. The locking member is axially reciprocal between the first axial position and the second axial position.

In another preferred embodiment, a chuck includes 30 a generally cylindrical body member having a nose section and a tail section. The tail section is configured to mate with the drive shaft so that the body rotates with the drive shaft. The nose section has an axial bore formed therein and a plurality of 35 angularly disposed passageways formed therethrough and

intersecting the axial bore, Each of a plurality of jaws is slidably positioned in one or the angularly disposed passageways Each jaw has a jaw face formed on one side thereof and threads formed on the 5 opposite side thereof. A nut is rotatably mounted on the body in engagement with the threads on the jaws so that rotation of the nut moves the jaws axially within the passageways. The chuck also includes an axially reciprocal sleeve and a clutch mechanism disposed lo ' operatively between the body and the nut. The sleeve' is rotationally held to, and axially movable with respect to, the clutch mechanism in at least one axial position of the sleeve. The clutch mechanism and the nut include, respective engaging surfaces disposed so 15 that the clutch mechanism and the nut are rotationally held to each other when engaged by a rotational force applied at the engaging surfaces by at least one of the clutch mechanism and the nut and so that the clutch mechanism is urged axially away from the nut 20 upon application of the rotational force A biasing mechanism is in operative communication with the clutch mechanism and opposes axial movement of the clutch mechanism away from the nut The biasing mechanism is configured with the clutch mechanism to 25 resist disengagement of the engaging surfaces until the rotational force exceeds a predetermined level.

Other obj ecus, features and aspects of the present invention are discussed in greater detail below. 30 Brief Description of the Drawings

A full an enabling disclosure of the present

invention, including the best mode thereof to one of ordinary skill in the art, is set lorry more particularly in the remainder or the specie Cation,

which makes reference to the accompanying figures, in which; Figure 1 is a longitudinal view, partly in section, of a chuck in accordance with an embodiment 5 of the present invention; Figure 2 is a longitudinal view, partly in section, of the chuck as in Figure 1; Figure 3 is a longitudinal view, partly in section, of the chuck as in Figure 1; 10 Figure 4 is an exploded view of the chuck as in Figure 1;..

Figure 5 is a partial exploded view of a chuck in accordance with an embodiment of the present invention; 15 Figure 6A is a longitudinal view, in cross section, of a chuck in accordance with an embodiment of the present invention; Figure 6B is a longitudinal view, in cross section, of the chuck as in Figure 6A; 20 Figure 7A is a longitudinal view, in cross section, of a chuck in accordance with an embodiment of the present invention; Figure 7B is a longitudinal view, in cross section of the chuck as in Figure 7A; 25 Figure 8A is a longitudinal view, in cross section, of a chuck in accordance with an embodiment of the present invention; Figure 8B is a longitudinal view, in cross section, of the chuck as in Figure 8A; and 30 Figure 9 is an exploded view of he chuck as in Figures 6A and 6B.

Repeat use of reference characters in the present specification and drawings is intended to represent

the same or analogous features or ele..ents of the 35 invention.

Detailed Description of Preferred Embodiments

Reference will now be made in detail to presently preferred embodiments of the invention, one or more examples of which are illustrated in the accompanying 5 drawings. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing 10 from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment may be used on another embodiment to yield a still further embodiment. Thus, it is intended that the present invention covers such modifications and 15 variations as come within the scope of the appended claims and their equivalents.

In the embodiments illustrated in the figures, a drill chuck has a body configured for attachment to a drill spindle and having passages in which jaws are 20 held. The jaws reciprocally move (in either an opening or closing direction) by a threadedly engaged nut In these embodiments, a locking member in the form of a generally cylindrical sleeve is axially moveable to either of two positions. In the first 25 position, the sleeve rotates with respect to the drill housing. In the second position, it is rotationally held to the housing and to the nut. That is, the locking sleeve does not rotate with respect to the housing or to the nut. In the embodiment shown in 30 Figures 1 - 4, the locking sleeve remains in the second position throughout opening and closing of the chuck once the operator moves the locking sleeve into the appropriate position. In the embodiments shown in Figures 6A - 9, however, the locking sleeve is held to 35 the nut through a clutch mechanism that rotationally

locks the sleeve and housing to the nut as long the clutch mechanism or nut does not substantially resist the rotational torque applied by the other component, as is described in more detail below. When the 5 resistance does overcome this torque, the nut teeth and clutch teeth slip over each other, allowing the nut to rotate with the body with respect to the locking sleeve, thereby preventing over tightening.

It should be understood, however, that the present 10 invention is not limited to such embodiments.

Referring to Figures 1 - 4, a chuck 10 includes a front sleeve 12, a body 14, jaws 16 and a nut 18.

Body 14 is generally cylindrical in shape and comprises a nose or forward section 20 and a tail or 15 rearward section 22. An axial bore 24 is formed in nose section 20. Axial bore 24 is dimensioned somewhat larger than the largest tool shank that the chuck is designed to accommodate. A threaded bore 26 is formed in tail section 22 and is of a standard size 20 to mate with a drive shaft 28 of a powered or hand driver indicated in part at 30. The bores 24 and 26 may communicate at a central region of body 14. While a threaded bore 26 is illustrated, such bore could be replaced with a tapered bore of a standard size to 25 mate with a tapered drive shaft or with any other suitable connection mechanism.

Passageways 32 are formed in body 14 to accommodate each jaw 16. Three jaws 16 are employed, and each jaw is separated from the adjacent jaw by an 30 arc of approximately 120 . The axes of the passageways 32 and the jaws 16 are angled with respect to the chuck axis and intersect the chuck axis at a common point ahead of chuck body 14. Each jaw 16 has a tool engaging portion 34, which is generally 35 parallel to the axis of chuck body 14, and threads 36

on its opposite or outer surface. Threads 36 may be constructed in any suitable type and pitch.

Body 14 includes a thrust ring member 38 which, in a preferred embodiment, may be integral with the S body. In an alternate embodiment, thrust ring 38 may be a separate component from the body member. Thrust ring 38 may also include a ledge portion to receive a bearing assembly 40. Thrust ring 38 includes a plurality of jaw guideways 42 formed around its 10 circumference to permit retraction of the jaws 16 therethrough Nut 18 is a one piece nut which includes threads 44 for mating with threads 36 on jaws 16. Nut 18 is positioned about the body in engagement with the jaw IS threads so that when the nut is rotated with respect to body 14, the jaws will be advanced or retracted. A nut retainer 46 is pressed to nose section 20 of body 14 and engages nut 18 at a forward ledge 48 thereof.

Thus, retainer 46 secures nut 18 in the axial 20 direction with respect to the body.

Nut 18 also includes a plurality of notches 50 receiving drive dogs 52 of front sleeve 12 by which front sleeve 12 and nut 18 are rotationally held to each other. A nose piece 54 is pressed to forward 25 section 20 of body 14 and retains front sleeve 12 in the axially forward direction by an annular lip 56 of sleeve 12.

The outer circumferential surface or sleeve 12 may be knurled or may be provided with longitudinal 30 ribs or any other configuration to enable a user to grip it securely. The sleeve may be fabricated from a structural plastic such as polyca-bonate, a filled polypropylene, for example glass filled plypropylene, or a blend of structural plastic materials. Other 35 composite materials such as, for example, graphite

filled polymerics may also be suitable in a given environment. In one embodiment, the sleeve is constructed from a 30% glass filled nylon 66 material.

As would be appreciated by one skilled in the art, the 5 materials for which the chuck of the present invention is fabricated will depend on the end use of the chuck, and the above are provided by way of example only.

A pair of rear body flanges 58 and 60 are pressed to rear portion 22 of body 14 at knurled portion 62.

10 An O-ring 64 sits in an annular shoulder 66 of rear body flange 60 to limit axial movement of a rear sleeve 68 in both the forward and rearward directions as is discussed below. Although rear body flanges 58 and 60 are illustrated in this embodiment as separate 15 members from body 14, it should be understood that they may be constructed integrally therewith Rear sleeve 68 is axially reciprocal with respect to body 14. In the position of rear sleeve 68 shown in Figure 1, axially aligned teeth 70 extending 20 radially inward from an inner circumferential surface 72 of rear sleeve 68 engage axially aligned teeth 74 (referring also to Figure 4) extending radially outward from outer circumferential surface 76 of rear body flange 58. Thus, rear sleeve 68 is rotationally 25 held to body 14 through rear body flange 58. O-ring 64 and rear body flange 50 prevent further rearward axial movement of rear sleeve 68. Using this axial rear sleeve position, an operator may operate chuck 10 as a two-sleeve keyless chuck By gripping rear 30 sleeve 68 and front sleeve 12, the operator holds body 14 and nut 18, respectively. Rotating the sleeves with respect to each other rotates the body and nut with respect to each other, thereby opening or closing the chuck depending upon the direction of relative 35 rotation.

As shown in Figure 2, however,. forward axial movement of rear sleeve 68 disengages teeth 70 from teeth 74, and teeth 70 move toward axially aligned teeth 78 extending radially outward from an outer 5 circumferential surface 80 of front sleeve 12. Teeth 78 are disposed far enough forward of teeth 74 so that teeth 70 clear teeth 74 before engaging teeth 78.

This allows for any slight rotation of sleeve 68 necessary to align' teeth 70 with the gaps between 10 teeth 78. It should be understood, however, that teeth 78 may be disposed more closely to teeth 74 so that teeth 70 engage teeth 18 before entirely disengaging teeth 74.

As teeth 70 engage teeth 78, axially aligned 15 teeth 82, which extend radially 'inward from inner circumferential surface 84 of rear sleeve 68, engage axially aligned teeth 86, which extend radially outward from an outer circumferential surface 88 of drill housing 90. referring to Figures 3 and 4, in 20 the rear sleeve's axially forward position, rear sleeve teeth 82 and 70 engage teeth 86 and teeth 78 of drill housing 90 and front sleeve 12, respectively.

Further forward axial movement of rear sleeve 68 is prevented by O-ring 64, upon which bears shoulder 92 25 of rear sleeve 68 In this position, teeth 70 have completely disengaged teeth 74 of rear body flange 58.

Accordingly, in the rear sleeve axial position shown in Figure 3, nut 18 is rotationally held to housing 90 by front sleeve 12 and rear sleeve 68. At 30 the same time, nut 18, front sleeve 12 and rear sleeve o8 are rotatable with respect to body 14, which rotates with spindle 28. According y, activation of drill 30 to rotate spindle 28 rotates body 14 with respect to nut 18, thereby opening or closing chuck 10 35 depending upon the spindle's rotational direction.

Because opening and closing of the chuck with sleeve 68 in this position requires only one of the operator's hands (to operate the drill), the operator may use his other hand to hold a drill bit or other 5 tool being locked into or released from the chuck.

Rear sleeve 68 may have the same or similar construction as front sleeve 12.

It should be understood that various suitable locking mechanisms may be used to rotationally hold 10 the rear sleeve to the body, the front sleeve, the housing and/or any other chuck component as appropriate in a given embodiment of the present invention. For example, the teeth 86 as illustrated in Figure 5- are wider and more spaced apart than the IS teeth 86 illustrated in Figure 4. Correspondingly, teeth 82 at the rear of rear sleeve 68 are wider to fill the gaps between teeth 86. In further embodiments, discussed in more detail below, radially - extending teeth may be replaced by axially extending 20 teeth. Moreover, it should be understood that any suitable locking mechanism construction and configuration is within the scope and spirit of the present invention.

In the embodiment illustrated in Figures 6A, 6B 25 and 9, front sleeve 12 is pressed onto a nose piece 100 at 102. Nose piece 100 is, in turn, pressed onto forward section 20 of body 14. Accordingly, unlike the embodiment illustrated in Figures 1 - 4, front sleeve 12 is rotationally held to body 14 rather than 30 nut 18.

Rear sleeve 68 is rotationally held to nut 18 during normal operation through a clutch mechanism including an annular clutch plate 104. Axially aligned teeth 106 extend radially outward from an 35 outer circumferential surface 108 or clutch plate 104

1 r ( and are received by grooves 110 between axially aligned teeth 112 extending radially inward from an inner circumferential surface of a forward section 114 of rear sleeve 68. Rear sleeve 68 is axially 5 reciprocal with respect to clutch plate 104 by the interaction between teeth 106 and grooves 110.

Clutch plate 104 is held in position between body 14 and nut 18 by a wave spring 116 Wave spring 116 bears on one side on body 14 through nose piece 100 10 and on the other side directly on clutch plate 104.

Wave spring 116, which may include one or more individual springs, biases clutch plate 104 axially toward nut 18 A lubricant may be provided on one or both sides of wave spring 116 andjor one or both 15 surfaces of clutch ring 104 and nose piece 100 to facilitate relative rotation between the clutch plate and the nose piece.

An engaging surface of clutch plate 104 includes a pair of lugs 117 extending axially forward from 20 annular surface 118 of the engaging surface. Sides 120 of each lug 117 are disposed at an oblique angle with respect to a plane 122 including the chuck axis 124. One side 120 of each lug 117 abuts an opposing 25 side 126 of a lug 128 extending axially from an annular surface 130 of an engaging surface of nut 18 as nut 18 is rotated with respect to body 14. As with sides 120, sides 126 are disposed at an oblique angle with respect to plane 122.

30 Rear sleeve 68 is biased forwardly by a wave spring 132, here formed by a plurality of wave springs' bearing on one side on body 14 through a rear body plate 134 pressed onto body 14 at 136 and on the other side on rear sleeve 68 through a rear sleeve 35 flange 138. Although not illustrated in Figure 9, it

should be understood that surface 136 may be knurled to facilitate the press fit between it and rear body plate 134. Furthermore, while rear sleeve flange 138 is illustrated as being attached to rear sleeve 68 by 5 dowels 140, it should be understood that any suitable attachment mechanism may be employed. For example, the rear sleeve flange may be integral with the rear sleeve or may be a separate piece integrally molded with the rear sleeve. One or both sides of spring 132 10 and/or one or_both of the sides of rear body plate 134 and rear sleeve flange 138 on which it directly bears may include a suitable lubricant to facilitate relative rotation Letween sleeve 68 and body 14.

In its axial position illustrated in Figure 6A, 15 rear sleeve 68 is rotatable with respect to body 14, and chuck 10 may be operated as a twosleeve keyless chuck. For example, an operator may grip front sleeve 12 to rotationally secure body 14 and may grip rear sleeve 68 to rotationally secure nut-18, which is 20 rotationally held to sleeve 68 through clutch ring 104 and the interface between lugs 117 and 128. Thus, relative rotation between front sleeve 12 and rear sleeve 68 opens or closes chuck 10 depending upon the direction of relative rotation.

25 When chuck 10 reaches a fully opened or a fully closed position, further movement of jaws 16 is prevented by the abutment of face 1 2 of jaws 16 against nut 18 or by the abutment of jaw faces 34 against each other or a tool. Nut 18 then tightens 30 onto threads 36 of jaws 16 and resists further rotas ion.

Because of the angled interface between sides 126 and 120 of lugs 128 and 117, respectively, part of the rotational force applied by sleeve 68 to nut 18 35 through clutch ring 104 is translated to an axial

it: ':: ( force tending to separate the clutch ring and the nut.

During normal operation, this force is resisted by the bias of spring 116. Because nut 18 is tightened onto the jaw threads as chuck 10 reaches a fully opened or 5 closed position, however, nut 18 resists the rotational force applied by the clutch plate, and additional rotational force is required to further rotate the nut. When the force applied between sides 126 and 120 creates a separation force exceeding the 10 counter force provided by biasing spring 116, clutch plate 104 is moved axially forward, compressing spring 116. Lugs 117 and 128 thus ride over one another, thereby allowing sleeve 68 to rotate with respect to nut 18 and preventing over tightening of the nut.

15 The force necessary to cause clutch plate 104 to ride over nut 18 is primarily determined by the strength of spring 116 and the angle of the sides 126 and 120. In one preferred embodiment, spring 116 includes two 22 lb. wave springs, and sides 120 and 20 126 are disposed at an angle of approximately 60 from surfaces 118 and 130, respectively. It should be understood, however, that the construction and dimensions of these components may be varied as suitable for a given chuck construction.

25 The chuck illustrated in Figures 6A, 6B and 9 may also be opened and closed through operation of the drill spindle. Accordingly, referring to Figures 6B and 9, rear sleeve 68 may be pushed axially rearward against the bias of spring 132 so that axially aligned 30 teeth 144 extending radially inward from inner circumferential surface 146 of rear sleeve 68 engage axially aligned teeth 148 extending radially outward from an outer circumferential surface or drill housing 90. Rear sleeve 68 slides axially rearward with 35 respect to clutch plate 104 but remains rotationally

held thereto through.the cooperation of grooves 110 and teeth 106. Thus, nut 18 is rotationally held to housing 90 through clutch plate 104 and rear sleeve 68. While holding sleeve 68 in the axially rearward 5 position illustrated in Figure 6B, an operator may activate the drill to rotate spindle 28, thereby rotating body 14 with respect to nut 18 to open or close chuck 10 depending on the spindle's rotational direction. The clutch mechanism operates as discussed 10 - above with respect to Figure 6A to prevent over tightening, except that rotational force is applied through nut 18 rather than through clutch plate 104.

The embodiment illustrated in Figures 7A and 7B operate similarly to the embodiment illustrated in 15 Figures 6A and Figure 6B, primarily except for the rotational engagement between rear sleeve 68 and housing 90. For purposes of clarity, wave spring 132 (Figures 6A and 6B) is not illustrated in Figures 7A and 7B. It should be understood, however, that this 20 spring is present in the embodiment illustrated in Figures 7A and 7B to perform a function similar to that discussed above. For example, the spring biases rear sleeve 68 forward to the axial position shown in Figure 7A..

25 Rather than employing radially extending teeth, rear sleeve flange 138 includes radially aligned teeth 150 extending axially rearward from rear sleeve flange 138. A housing plate 152 includes radially aligned teeth 154 extending axially forward therefrom and 30 opposing teeth 150. In the axial position illustrated in Figure 7A, rear sleeve 68 is rotatable with respect to body 14 and housing 90, and chuck 10 may be operated as a twosleeve keyless chuck as described above with respect to Figure 6A.

l Nt: As shown in Figure 7B, rear sleeve 68 may be pulled rearwardly against the biasing spring to engage teeth 150 and 154, thereby rotationally holding sleeve 68 to housing 90. Sleeve 68 slides rearwardly with 5 respect to, but remains rationally held to, clutch plate 104. Thus, nut 18 is rotationally held to housing 90 through clutch plate 104 and rear sleeve 68. Activation of the drill to rotate spindle 28 thus rotates body 14 with respect to nut 18, thereby 10 opening or closing chuck lO depending upon the spindle's rotational direction.

The embodiment of chuck 10 illustrated in Figures 8A and 8B is constructed and operates similarly to the embodiment illustrated in Figures 7A arid 7B, p- -'ma- -il-y 15 except that the rear biasing spring 132 (Figures 6A and GB) and rear body plate are replaced by a detent mechanism including a coil spring 156 and a ball 158.

In one preferred embodiment, the detent mechanism is a self-contained mechanism that threads into body 14. A 20 collar or other suitable stop is provided to prevent ball 158 from being pushed entirely out of the mechanism by spring 156.

Referring to Figure 8A, rear sleeve 68 is held in the forward axial position by ball 158 bearing against 25 rear sleeve flange 138. With rear sleeve 68 in this position, chuck 10 may be operated as a two-sleeve keyless chuck as described above with respect to Figures 6A and 7A.

When rear sleeve 68 is pulled rearwardly, rear 30 sleeve flange 138 presses ball 158 downward, compressing spring 156. If sufficient rearward axial force is applied, rear sleeve 68 passes over ball 158 so that teeth 154 engage teeth 150 to rotationally hold rear sleeve 68 to housing 90, thereby 35 rotationally holding nut 18 to housing 90 through

l ( clutch plate 104 and rear sleeve 68. Chuck 10 may then be opened or closed through activation of the drill as discussed above with respect to Figures 6B and 7B, except that it is not necessary for the 5 operator Lo grip rear sleeve 68 during this operation.

The rear sleeve is retained in the rearward axial position as shown in Figure 8B by ball 158 bearing upon rear sleeve flange 138. Spring 156 is strong enough to hold rear sleeve 68 in the rearward axial lo position as shown in Figure 8B during opening and closing of chuck 10 but yetcompressible enough so that an operator may move rear sleeve 68 between the forward and rearward axial positions.

While one or more preferred embodiments of the 15 present invention are described above, it should be appreciated that various suitable embodiments are encompassed by the present invention. For instance, in another preferred embodiment, the reciprocal locking sleeve is mounted about the chuck body and is 20 axially movable to either of two operative positions.

In the first, the locking sleeve is rotationally held to the body by opposing teeth on the sleeve and the body as at 70 and 74 in Figures 1 and above. With the locking sleeve in this axial position, the chuck 25 may be operated as a two-sleeve keyless chuck by relative rotation between the locking sleeve and a second sleeve rotationally held to the nut. The second sleeve may be forward of the locking sleeve. A suitable biasing mechanism may be provided to bias the 30 locking sleeve to the first axial position.

In this axial position, the locking sleeve does not rotatably engage the nut and is therefore rotatable with respect to the nut Opposing lugs, such as lugs 117 and 128 on clutch plate 104 and nut 35 18 in Figure 9, are provided on the nut and the

locking sleeve so that when the locking sleeve is moved axially into engagement with the nut, the locking sleeve is rotationally held to the nut. While an operator grips the locking sleeve, activation of 5 the drill to rotate the drill spindle opens or closes the chuck depending upon the rotational direction of the spindle. The lugs on the locking sleeve and nut have angled sides as described above with respect to the lugs on the clutch plate and nut in Figures 6A and 10 6B, creating a clutch to prevent over tightening of the nut.

The clutching action causes the locking sleeve to move axially away from the nut. Thus, enough space is provided so that the locking mechanism between the 15 locking sleeve and the body in the first axial position does not reengage during the clutching action. A clutch spring may be provided between the nut and the body so that the nut moves away from the locking sleeve, with respect to the body, when the nut 20 and locking sleeve are pushed apart.

In a still further embodiment, the locking sleeve as described with respect to the previous embodiment is always rotationally held to the drill housing - during the chuck's operation. The sleeve may be held 25 in any suitable manner, for example by an axially toothed interface, so that the locking sleeve may move axially, but not rotationally, with respect to the drill housing. A spring bears on one end on the chuck body and on its other end against the locking sleeve 30 to bias the locking sleeve away from the nut. Thus, during normal operation, the locking sleeve does not engage the nut. To open or close the chuck, an operator axially moves the locking sleeve against the spring bias to engage the nut. As above, opposing 35 angled teeth are provided on the nut and the locking

i: -: ( 19 sleeve to rotationally hold them to each other. When the drill is thereafter activated to rotate the spindle, the body rotates with respect to the nut, thereby opening or closing the chuck depending on the 5 spindle's rotational direction. When the chuck is fully opened or closed, the nut and locking sleeve are pushed apart with respect to each other, allowing the nut to again rotate with the body and thereby preventing over tightening. A clutch spring is 10 provided between the nut and the body so that the nut moves away from the locking sleeve, with respect to the chuck body, when the nut and locking sleeve are pushed apart, thereby reducing the axial force applied to the locking sleeve opposing the operator's grip 15 Furthermore, it should be understood that the identification of a rear" sleeve in the embodiments in the figures is for illustrative purposes only.

Moreover, it should be understood by those skilled in this art that the chuck components described above may 20 be arranged and configured in various suitable manners within the present invention For example, the locking and biasing mechanisms may be arranged so that the locking sleeve is pushed forward, rather than rearward to hold the nut to the drill housing Thus, 2s various modifications and variations to the present invention may be practiced by those of ordinary skill in the art without departing from the spirit and scope of the present invention, which is more particularly set forth in the appended claims. In addition, it 30 should be understood that aspects of the various embodiments may be interchanged both in whole or in part. Furthermore, those of ordinary skill in the art will appreciate that the foregoing description is

provided by way of example only, and is not intended

to be limitative of the invention so further described in such appended claims.

Claims

- 21 Claims

1. A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom, said chuck comprising: 5 a generally cylindrical body having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore; a plurality of jaws slidably positioned in each of said angularly disposed 10 passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways; an axially reciprocal sleeve; and 1 S a clutch mechanism disposed operatively between said body and said nut, wherein said sleeve is rotationally held to, and axially movable with respect to, said clutch mechanism in at least one axial position of said sleeve, and wherein said clutch mechanism and said nut include respective engaging surfaces disposed so that said clutch mechanism and said nut are rotationally held to 20 each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism and said nut and so that said clutch mechanism is urged away from said nut upon application of said rotational force, and including a biasing mechanism in operative communication with said clutch mechanism and opposing axial movement of said clutch mechanism away from said 25 nut, said biasing mechanism being configured with said clutch mechanism to resist disengagement of said engaging surfaces until said rotational force exceeds a predetermined level.

2. A manual or powered driver, said driver comprising: 30 a housing; a chuck, said chuck including

- ' a generally cylindrical body having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore; 5 a plurality of jaws slidably positioned in each of said angularly disposed passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways; 10 an axially reciprocal sleeve; and a clutch mechanism disposed operatively between said body and said nut, wherein said sleeve is rotationally held to, and axially movable with respect to, said clutch mechanism in al least one axial position of said sleeve, and wherein said clutch mechanism and said nut include respective engaging 15 surfaces disposed so that said clutch mechanism and said nut are rotationally held to each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism and said nut and so that said clutch mechanism is urged away from said nut upon application of said rotational force, and including a biasing mechanism in operative communication with said clutch 20 mechanism and opposing axial movement of said clutch mechanism away from said nut, said biasing mechanism being configured with said clutch mechanism to resist disengagement of said engaging surfaces until said rotational force exceeds a predetermined level.

-A (' id. A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom, said chuck comprising: a generally cylindrical body member having a nose 5 section and a tall section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed 10 therethrough and intersecting said axial bore; a plurality of jaws slidably positioned in each of.said angularly disposed passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; 15 a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways; and a locking member which 20 in a first axial position is rotatable with respect to said driver housing, and in a second axial Position operatively engages said housing and said nut so that said locking member is rotationally held to said housing and said 25 nut so that said nut is rotationally held to said housing, wherein said locking member is axially reciprocal between said first axial pos Lion and said second axial position.

4. The chuck as in c: im ?, wherein said locking member includes a Generally cylindrical sleeve mounted about said body.

-. 5. The chuck as in claim 4 wherein said sleeve in said first axial position is rotationally held to said body.

A. The chuck as in claim 5, wherein said body includes axially aligned teeth extending radially outward from an outer circumferential surface of said body, wherein said sleeve includes axially aligned 5 teeth extending radially inward from a circumferential surface of said sleeve, and wherein in said first axial position said sleeve teeth engage said body teeth to rotationally hold said sleeve to said body.

7. The chuck as in claim 6, wherein said body includes a flange defining said outer circumferential surface of said body.

A. The chuck as in claim 7, wherein said flange is attached to a portion of said body separate from said flange.

A. The chuck as in claim 3, including a - generally cylindrical first sleeve mounted about said body and engaging said nut so that said first sleeve rotates with said nut.

kin The chuck as in claim 9, wherein said locking member includes a generally cylindrical second sleeve mounted about said body.

1l. The chuck-as in claimed, wherein said second sleeve includes a first locking mechanism and a second locking mechanism, each or said first locking mechanism and said second locking mechanism being 5 disposed on said second sleeve so that when said second sleeve is in said second axial position, said first locking mechanism engages said rinse sleeve so that said second sleeve is rotationally held to said first sleeve, and said second locking mechanism lo engages said drill housing so that said second sleeve is rotationally held to said drill housing

- - ( 12. The chuck as in claim 1, wherein said first locking mechanism includes axially aligned teeth extending radially inward from an inner circumferential surface of said second sleeve, wherein 5 said first sleeve includes axially aligned teeth extending radially outward from an outer circumferential surface of said first sleeve, and wherein said second sleeve teeth engage said first sleeve teeth when said second sleeve is in said second axial position.

lo. The chuck as in claim A, wherein said second locking mechanism includes axially aligned teeth extending radially inward from an inner circumferential surface of said second sleeve and 5 wherein said second sleeve teeth engage axially aligned teeth on said drill housing when said second sleeve is in said second axial position.

At. The chuck as in claim li, wherein said first locking mechanism is separate from said second locking mechanism. 1. The chuck as in claim it, wherein said sleeve in said first axial position is rotationally held to said nut.

i&. The chuck as in claim id, including a biasing mechanism, said biasing mechanism biasing said locking member to said first axial position.

Jo. The chuck as in claim I b wherein said biasing mechanism includes a spring bearing on one end against said body and on the other end on said locking member. 1; The chuck as in claim 3, including a latching mechanism configured to retain said locking mechanism in said first axial position when said locking member is in said first axial position, and to 5 retain said locking mechanism in said second axial

( 2t position when said locking mechanism is in said second axial position, until application of an axial force exceeding a predetermined level.

i9. The chuck as in claim lo, wherein said latching mechanism includes a detent mechanism.

2. The chuck as in claim (q, wherein said detent mechanism includes a ball disposed in said body and urged radially outward therefrom by a spring, said locking member having a flange disposed on said 5 locking member so that said flange is on one side of said ball when said locking member is in said first axial position and is on an opposite side of said ball when said locking member is in said second axial position, said ball preventing-said flange from 10 passing over said ball from said one side to said opposite side until application of said predetermined axial force.

ZI. The chuck as in claim 3, including a clutch mechanism disposed operatively between said body and said nut, wherein said locking member is rotationally held 5 to, and axially movable with respect to, said clutch mechanism in said second axial position, and wherein said clutch mechanism and said nut include respective engaging surfaces disposed so that said clutch mechanism and said nut are rotationally 10 held to each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism aid said nut and so that said clutch mechanism is urged axially away rom said nut upon application of said rotational fo- _, and 15 including a biasing mechanism in operative communication with said clutch mechanic.., and opposing axial movement of said clutch mechanism away from said nut, said biasing mechanism being configured with said

i, ( 27 clutch mechanism to resist disengagement of said 20 engaging surfaces until said rotational force exceeds a predetermined level.

zz. The chuck as in claim 21' wherein said locking member includes a generally cylindrical sleeve. Z3. The chuck as in claim ZI wherein said clutch mechanism includes an annular ring.

All. The chuck as in claim Z3, wherein said annular ring is disposed axially forward of said nut.

- 2. The chuck as in claim Z3, wherein said engagement surface of said annular ring includes at least one lug extending axially from said annular ring toward said nut, 5 wherein said engagement surface or said nut includes at least one lug extending axially from said nut toward said annular ring, and wherein said nut lug and said annular ring lug define respective opposing sides abutting each other 10 upon engagement of said annular ring and said nut, said lug sides being substantially parallel to each other, substantially planar, and oblique with respect to the axis of said body.

26. The chuck as in claim L3, wherein said annular ring has a radially outer circumferential surface defining an axially aligned rib, and wherein said locking member includes an axially 5 aligned groove receiving said rib to permit relative axial movement between said annular ring and said locking member.

27. The chuck as in claim, including a plurality of said ribs and said grooves.

2. The chuck as in claim - 1, wherein said locking member is rotationally held to said clutch mechanism in said first axial position.

( 257 . The chuck as in claim 28, wherein said locking member includes a generally cylindrical sleeve mounted about said body, and wherein said sleeve includes a locking mechanism 5 disposed on said sleeve so that when said sleeve is in said second axial position, said locking mechanism engages said drill housing so that said sleeve is rotationally held to said drill housing.

Ad. The chuck as in claim 1, wherein said locking mechanism includes axially aligned teeth extending radially inward from an inner circumferential surface of said sleeve and wherein 5 said teeth engage teeth on said drill housing when said sleeve is in said second axial position.

Al. The chuck as in claim 2;, including a second biasing mechanism biasing said sleeve co said first axial position.

72. The chuck as in claim 31, wherein said second biasing mechanism includes a Spring bearing on one end against said body and on the other end on said sleeve. . The chuck as in claim Zq, including a latching mechanism configured to retain said sleeve in said first axial position when said sleeve is in said first axial position, and to retain said sleeve in 5 said second axial position when said sleeve is in said second axial position, until application of an axial Force to said sleeve exceeding a predetermined level.

-hi. The chuck as in claim 3, wherein said latching mechanism includes a detent mechanism 3. The chuck as in claim 34, wherein said detent mechanism includes a ball disposed in said body and urged radially outward ther_rvom By a spring, said sleeve having a flange disposed on sa d sleeve so that 5 said flange is on one side OE said bat when said l

f sleeve is in said first axial position and is on an opposite side of said ball when said sleeve is in said second axial position, said ball preventing said flange from passing over said ball from said one side 10 to said opposite side until application of said predetermined axial force.

3b The chuck as in claim 2Q, wherein said locking mechanism includes radially aligned teeth extending axially from said sleeve from a transverse surface thereof and wherein said teeth engage teeth on 5 said drill housing when said sleeve is in said second axial position.

37. A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft exceeding therefrom, said chuck compris ng: a generally cylindrical body member having a nose 5 section and a tail section, said tail section configured to mate with said dri-v-e shaf_ so that said body rotates with said die shaft and said nose section having an axial bore formed therein and a plurality of angularly disposed zassage-.vays formed 10.herethrough and intersecting said aria' bore; a plurality of jaws slidabl-,- positioned in each of said angularly disposed passe sways, each of said jaws having a jaw face formed or. One site thereof and threads formed on the op?cs =e s de thereof; 15 a rut rotatably mounted o- said 'Cody in engagemen with said threads on said jams so that

l ( 31 rotation of said nut moves said jaws axially within said passageways; a first generally cylindrical sleeve mounted 20 about said body and engaging said nut so that said first sleeve rotates.with said nut; and a second generally cylindrical sleeve mounted about said body and axially reciprocal with respect thereto, 25 wherein said second sleeve includes a first locking mechanism disposed on said sleeve so that said first locking mechanism, when said second sleeve is in a first axial position, engages said body so that said second sleeve is rotationally held to said body, 30 wherein in said first axial position said second sleeve is rotatable with respect to said housing, wherein said second sleeve includes a second locking mechanism disposed on said second sleeve so that said second locking mechanism, when said second 35 sleeve is in a second axial position, engages said first sleeve so that said second sleeve is rotationally held to said first sleeve, wherein when said second sleeve is in said second axial position said second sleeve is rotatable with 40 respect to said body, wherein said second sleeve includes a third locking mechanism disposed on said second sleeve so that said third locking mechanism, when said second sleeve is in said second axial position, engages said 45 housing so that said second sleeve is rotationally held to said housing, and wherein said second sleeve is axially reciprocal with respect to said body between said mist axial position and said second axial position.

3Z . The chuck as in claim 3 7 wherein said first locking mechanism includes said second locking mechanism. 3ci. The chuck as in claim &7, wherein said first and second locking mechanisms include first axially aligned teeth extending radially inward from an inner circumferential surface of said second sleeve, 5 wherein said body includes second axially aligned teeth extending radially outward from an outer circumferential surface of said body so that said first teeth engage said second teeth when said second sleeve is in said first position to rotationally hold 10 said second sleeve to said body, wherein said first sleeve includes third axially aligned teeth extending radially outward 'ram an outer circumferential surface of said first sleeve so that said first teeth engage said third teeth when said 15 second sleeve is in said second axial position to rotationally hold said second sleeve to said first sleeve, and wherein said second sleeve includes fourth -xially aligned teeth extending radially inward from 20 an inner circumferential surface of said second sleeve so that said fourth teeth engage axially aligned teeth on said housing when said second sleeve is in said second axial position to rotationally hold said second sleeve to said housing.

4. A chuck for use with a manual or powered -river having a housing and a rotatable drive shaft extending therefrom, said chuck comprising: a generally cyli arical Cody member having a 5 rose section and a tail section, said 42'1 section configured to mate with said drive sha_t so that said Cody rotates with said drive shaft and said nose section having an axial bore formed therein and a

plurality of angularly disposed passageways formed 10 therethrough and intersecting said axial bore; a plurality of jaws slidably positioned in each of said angularly disposed passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; 15 a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways) a clutch mechanism disposed operatively between 20 said body and said nut; and a generally cylindrical sleeve axially reciprocal with respect to and disposed about said body, said sleeve in a first axial position being rotatable 25 with respect to said. body, and in a second axial position operatively engaging said housing and said clutch mechanism so that said sleeve is rotationally held to said housing and so that said sleeve is rotationally held to, and 30 axially movable with respect to, said clutch mechanism; wherein said clutch mechanism and said nut include respective engaging surfaces disposed so that said clutch mechanism and said nut are rotationally 35 held to each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism and said nut and so that said clutch mechanism is urged axially away from said nut upon application of said rotational Force; and 40 a biasing mechanism in oPerat he communication with said clutch mechanism a-d ODES' ng axial movemen o: said clutch mechanism away from said nut, said biasing mechanism being configured with said clutch

= : mechanism to resist disengagement or said engaging 45 surfaces until said rotational force exceeds a predetermined level, and wherein said sleeve includes a locking mechanism disposed on said sleeve so that when said sleeve is in said second axial position, said locking mechanism 50 engages said drill housing so that said sleeve is rotationally held to said drill housing.

44. The chuck as in claim To, T vherein said clutch mechanism includes an annular ring.

47. The chuck as in claim Ill, wherein said annular ring has a radially outer circumferential surface defining an axially aligned rib, and wherein said sleeve includes an axially aligned 5 groove receiving said rib to permit relative axial movement between said annular ring and said sleeve.

43. The chuck as in claim &O, vnerein said sleeve is rotationally held to said lurch mechanism in said first axial positicn.

4. The chuck as in claim RIO, wherein said locking mechanism includes axially aligned teeth extending radially inward from an inner circumferential surface of said sleeve and wherein 5 said teeth engage teeth on said drill housing when said sleeve is in said second axial position.

Q5. The chuck as in claim 4a, including a second biasing mechanism biasing said sleeve to said first axial position.

46. The chuck as in claim As-, -.vnerein said second biasing mechanism includes a spring bearing on one end against said body and on the other end on said sleeve. g7. The chuck as in claim A, including a latching mechanism configured.o retain said sleeve -n said first axial position when said sleeve is in said

-all first axial position, and to retain said sleeve in 5 said second axial position when said sleeve is in said second axial position, until application of an axial force to said sleeve exceeding a predetermined level.

42. The chuck as in claim 47, wherein said latching mechanism includes a detent mechanism.

0,. The chuck as in claim I, wherein said locking mechanism includes radially aligned teeth extending axially from said sleeve from a transverse surface thereof and wherein said teeth engage teeth on 5 said drill housing when said sleeve is in said second axial position.

So. A manual or powered driver, said driver comprising: a housing; a rotatable drive shaft extending from said 5 housing; and a chuckj said chuck including a generally cylindrical body member having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said 10 body rotates with said drive shaft and said nose section having an ax al bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore; a plurality of jaws slidably positioned in 15 each of said angular y disposed passageways, each of said jaws having a jaw fac" foraged on one side thereof and threads formed a- the opposite side thereof; a nut rotatable mounted on said body in engagement with said threads on said jaws so that 20 rotas-on of said nut moves said jaws axially within said passageways; and a locking member which

3 -. in a first axial position is rotatable with respect to said driver housing, and 25 in a second axial position operatively engages said housing and said nut so tha. said locking member is rotationally held to said housing and said nut so that said nut is rotationally held to said housing, 30 wherein said locking member is axially reciprocal between said first axial position and said second axial position.

s

Amendments to the claims have been filed as follows 1: A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom, said chuck comprising: 5 a generally cylindrical body having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore; a plurality of jaws slidably positioned in each of said angularly disposed 10 passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways; an axially reciprocal sleeve; and 15 a clutch mechanism disposed operatively between said body and said nut, wherein said sleeve is rotationally held to, and axially movable with respect to, said clutch mechanism in at least one axial position of said sleeve, and wherein said clutch mechanism and said nut include respective engaging surfaces disposed so that said clutch mechanism and said nut are rotationally held to 20 each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism and said nut and so that said clutch mechanism is urged away from said nut upon application of said rotational force, and including a biasing mechanism in operative communication with said clutch mechanism and opposing axial movement of said clutch mechanism away from said 25 nut, said biasing mechanism being configured with said clutch mechanism to resist disengagement of said engaging surfaces until said rotational force exceeds a predetermined level.

2. A manual or powered driver, said driver comprising: 30 a housing; a rotatable drive shaft extending from said housing; and a chuck, said chuck including

a generally cylindrical body having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and said nose section having an axial bore formed therein and a plurality of angularly disposed passageways formed therethrough and intersecting said axial bore; a plurality of jaws slidably positioned in each of said angularly disposed passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; a nut rotatably mounted on said body in engagement with said threads on said jaws so that rotation of said nut moves said jaws axially within said passageways; 10 an axially reciprocal sleeve; and a clutch mechanism disposed operatively between said body and said nut, wherein said sleeve is rotationally held to, and axially movable with respect to, said cintch mechanism in at least one axial position of said sleeve, End wherein said clutch mechanism and said nut include respective engaging 1: surfaces disposed so that said clutch mechanism and said nut are rotationally held to each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism and said nut and so that said clutch mechanism is urged away from said nut upon application of said rotational force, and including a biasing mechanism in operative communication with said clutch 20 mechanism and opposing axial movement of said clutch mechanism away from said nut, said biasing mechanism being configured with said clutch mechanism to resist disengagement of said engaging surfaces until said rotational force exceeds a predetermined level.

: 3. A chuck for use with a manual or powered driver having a housing and a rotatable drive shaft extending therefrom, said chuck comprising: a generally cylindrical body having a nose section and a tail section, said tail section configured to mate with said drive shaft so that said body rotates with said drive shaft and said nose section having an axial bore formed therein and a plurality of O angularly disposed passageways formed therethrough and intersecting said axial bore;

a plurality of jaws slidably positioned in each of said angularly disposed passageways, each of said jaws having a jaw face formed on one side thereof and threads formed on the opposite side thereof; a nut rotatably mounted on said body in engagement with said threads on said 5 jaws so that rotation of said nut moves said jaws axially within said passageways; a clutch mechanism disposed operatively between said body and said nut; and a generally cylindrical sleeve axially reciprocal with respect to and disposed about said body, said sleeve in a first axial position being rotatable with respect to said body, and 10 in a second axial position operatively engaging said housing and said clutch mechanism so that said sleeve is rotationally held to said housing and so that said sleeve is rotationally held to, and axially movable with respect to, said clutch mechanism; wherein said clutch mechanism and said nut include respective engaging 15 surfaces disposed so that said clutch mechanism and said nut are rotationally held to each other when engaged by a rotational force applied at said engaging surfaces by at least one of said clutch mechanism and said nut and so that said clutch mechanism is urged axially away fromsaid nut upon application of said rotational force; and a biasing mechanism in operative communication with said clutch mechanism 20 and opposing axial movement of said clutch mechanism away from said nut, said biasing mechanism being configured with said clutch mechanism to resist disengagement of said engaging surfaces until said rotational force exceeds a predetermined level, and wherein said sleeve includes a locking mechanism disposed on said sleeve so 25 that when said sleeve is in said second axial position, said locking mechanism engages said drill housing so that said sleeve is rotationally held to said drill housing.

4. The chuck as in claim 3, wherein said clutch mechanism includes an annular nag.

5. The chuck as in claim 4, wherein said annular ring has a radially outer circumferential surface defining an axially aligned rib, and

wherein said sleeve includes an axially aligned groove receiving said rib to permit relative axial movement between said annular ring and said sleeve.

6. The chuck as in any of claims 3 to 5, wherein said sleeve is rotationally held to 5 said clutch mechanism in said first axial position.

7. The chuck as in any of claims 3 to 5, wherein said locking mechanism includes axially aligned teeth extending radially inward from an inner circumferential surface of said sleeve and wherein said teeth engage teeth on said drill housing when said sleeve 10 is in said second axial position.

8. The chuck as in any of claims 3 to 7, including a second biasing mechanism biasing said sleeve to said first axial position.

15

9. The chuck as in claim 8, wherein said second biasing mechanism includes a spring bearing on one end against said body and on the other end on said sleeve.

10. The chuck as in any of claims 3 to 9, including a latching mechanism configured to retain said sleeve in said first axial position when said sleeve is in said 20 first axial position, and to retain said sleeve in said second axial position when said sleeve is in said second axial position, until application of an axial force to said sleeve exceeding a predetermined level.

1 1. The chuck as in claim 10, wherein said latching mechanism includes a detent 25 mechanism.

12. The chuck as in claim 3, wherein said locking mechanism includes radially aligned teeth extending axially from said sleeve from a transverse surface thereof and wherein said teeth engage teeth on said drill housing when said sleeve is in said second 0 axial position.