MXPA97009654A - Keyless mandrel actuated through pala - Google Patents

Abstract

The present invention relates to a mandrel for use with a manual or electric controller, having a rotating drive shaft, the mandrel is characterized in that it comprises: a) a generally cylindrical body element having a nose or front section and a tail or tail section, the tail section is adapted to engage with the drive shaft of the actuator and the nose section has an axial hole formed therein and a plurality of angularly disposed passages or passages formed therethrough and that intersect with the axial hole, b) a plurality of jaws slidably positioned in each of the steps or passages arranged angularly, each of the jaws has a jaw face formed on one side thereof, to be placed in contact with a tool to be retained by it and threads formed on the opposite side of the same for coupling with a nut; c) a nut mounted rotatably with respect to the body member and in engagement with the threads on the jaws; d) a sleeve element in drive engagement with the nut, such that when the sleeve element is rotated with respect to the element of body, the jaws will be moved by the same, e) a complementary tightening mechanism configured and arranged to drive the nut towards the nose section and thereby cause the jaws to produce an improved tightening force on the tool; for the release of the drive through the tightening mechanism completely

Description

BACKGROUND OF THE INVENTION The present invention relates in general to the mandrels for use with manual or mechanical drills or with electric or pneumatic manual actuators. More particularly, it disengages a mandpl of the keyless type, which can be tightened or loosened manually or by driving the motor of the actuator The actuators for electric or pneumatic, manual tools are well known Although the common drill bits are the most common tools used with such harrowers, the tools can also comprise screwdrivers, female screwdrivers, bunles, mounted abrasive wheels and other cutting or abrasive tools Since the tools can have vanable diameter rods or the cross section of the tool shank can be polygonal, the device is usually provided with a mandrel which is adjustable over a range relatively wide The mandpl can be attached to the harrow or controller by means of a threaded or widened hole or bore. A wide vapedad of jaws have been developed in the art. In the simplest form of mandrel, three jaws spaced arcunferenally by approximately 120 ° each other are restpngidas by passages or passages arranged arcularly in a body attached on the axis of the controller of a harrow The jaws are configured in such a way that the rotation of an internally threaded ring or nut of appete, which engages with the external threads on the jaws, drives to the jaws to a relationship of REF: 26320 clamping with respect to the cylindrical rod of a tool, when it is rotated in one direction, while rotation in the opposite direction, releases the clamping relation. Such a mandrel can be without a key, if it is manually rotated. An example of such a mandrel is described in U.S. Patent No. 5,125,673 entitled "Non-I Key Keyless Chuc" assigned in common to the assignee herein and the entire disclosure of which is incorporated herein by reference. It is desirable in a keyless mandrel to obtain a sufficient holding force within the tightening capacity of a normal user. With many of the jaw chucks as described above, one means of improving the holding force on a tool has been to use relatively thin threads on the jaws, which engage with the nut to improve the amount of force that can be generated. . This solution has the disadvantage that a relatively large number of turns of the nut are necessary to travel in the diameter range of the tools that can be accepted by the mandrels. In addition, friction reducing means such as bearings or bearings have been used to further improve the amount of clamping force that can be generated. In addition, it may be desirable to improve the clamping force obtainable by a normal user, above and beyond what is normally obtainable with the three jaw chucks available at present. An example of such a mandrel is described in the North American patent application Serial No. 08/206, 115 entitled "Level Bar Keyless Chuck", assigned in common to the assignee herein, the entire description of which is incorporated by reference herein.

BRIEF DESCRIPTION OF THE INVENTION The present invention acknowledges and addresses the foregoing considerations and other constructs and methods of the prior art. It is therefore an object of the present invention to provide an improved mandrel. It is another object of the present invention to provide a mandipl wrench that is capable of improving the clamping forces It is another object of the present invention to provide a keyless mandrel that allows the faecal and rapid change of the size of the tool over a wide range of tool rod diameters It is another object of the present invention provide a keyless mandrel that proporaona a double stage or complementary to the jaws It is an adiaonal object of the present invention to provide a mandrel that allows easy and quick release of the tool Objects and additional advantages of the invention They will summarize in part in the following description and in part will be obvious from the description or can be learned by practicing the invention. The objects and advantages in the invention can be realized and obtained by means of the instrumentations and combinations indicated particularly in the reivmdicaaones. Attachments To obtain the objects and in accordance with the purpose of the invention, as widely implemented and deciphered herein, a mandpl for use with a manual or electric handler or harpooner, has a giratopo shaft, includes a body element in general, which has a napz or front dryer and a dryer The rear or tail dryer is adapted to be coupled to the drive shaft of the controller and the front or napz dryer has an axial bore formed therein and a plurality of steps or angularly disposed passages formed through the same and that are intercepted with axial piercing. The mandrel includes a plurality of jaws slidably positioned in each of the angularly disposed passages or passages. Each of the jaws has a jaw face formed on one side thereof to engage with a tool to be retained therethrough and threads formed on the opposite side thereof for engagement with a nut. The mandrel further includes a nut rotatably mounted with respect to the body member and in engagement with the threads on the jaws. The mandrel also includes a sleeve element in drive engagement with the nut such that when the sleeve member is rotated with respect to the body member, the jaws will be moved therewith. The mandrel includes a complementary clamping mechanism, which has a cam portion rotatable with respect to the body member. The complementary clamping mechanism further includes a plurality of lever bars, a portion of each of the lever bars forms a cam follower and another portion of each of the lever bars is operatively associated with the nut, such that when the complementary clamping mechanism is actuated by rotation of the cam portion, the lever bars will propel the nut toward the nose section and thereby cause the jaws to produce an improved clamping force on the tool. According to the present invention, the mandrel includes means for the release of the drive through the complementary clamping mechanism. In a preferred embodiment, the through-drive release means of the complementary clamping mechanism includes a plurality of profiles formed in the cam portion. Each of the profiles extends radially from the axial center line of the body member to a different radial distance. to each of the other cam profiles The cam profile includes an initial or release cam profile disposed at a minimum radial distance from the axial center line of the body member than the other profiles The cam profile including a cam profile tight cam, disposed at a greater radial distance from the axial centerline of the body member than the release cam profile The cam profile includes an outward inclined transition cam profile disposed at a radial distance from the axial center line of the cam. body element, which varies gradually from the minimum radial distance of the initial cam profile to the distance r Greater dial of the tight cam profile The cam portion includes a cam profile of a through drive arranged at a greater radial distance from the axial center line of the body member than the cam profile of the cam The cam portion includes a cam profile of retention, disposed at a radial distance from the axial center line of the body member which varies gradually from the radial distance of the clamping cam profile to the greater radial distance of the through-driving cam profile In accordance further with the present invention, The mandrel includes a spring element that is configured and arranged to resiliently drive the front sleeve element to the tail dryer or post-body element. Also according to the present invention., the mandrel includes a thrust ring disposed on the body member and extending radially from the body member. The thrust ring defines at least one coupling surface configured with an escutcheon shape to rotatably reopen one of the lever bars. The received lever bar has a seating surface configured with a spherical shape for rotary movement against the spherically formed coupling surface of the thrust ring. The seating surface of the lever bar is rotatably received on the engagement surface of the thrust ring. Objects, features and additional aspects of the present invention are discussed in more detail below.

BRIEF DESCRIPTION OF THE DRAWINGS A full and complete description of the invention, which includes the best mode thereof, for those skilled in the art, is summarized more particularly in the remainder of this specification, which includes reference to the accompanying figures, in which Figure 1 is a cross-sectional view of a mandrel according to an embodiment of the present invention; Figure 2 is another cross-sectional view of one embodiment of the present invention; Figure 3 is an exploded view of the mandrel illustrated in Figures 1 and 2; Figure 4 is a partial cross-sectional view of a mandrel according to the present invention; Figure 5 is a cross-sectional view taken along lines 5-5 of Figure 1; Figure 6 is a partial cross-sectional view of the lever mechanism of Figure 5, showing the lever mechanism activated; Fig. 7 is a partial cross-sectional view of the lever mechanism of Fig. 6, showing the lever mechanism operative of a through-drive release position; Fig. 8 is an exploded view of a mandrel in accordance with Figs. one embodiment of the present invention, Figure 9 is a cross-sectional view of the paraffin sleeve and the resilient means, taken along line 9-9 of Figure 1, and Figure 10 is a cross-sectional view part of a portion of a mandp according to the present invention, illustrating vapaaons in the resilient means shown in figure 9. The repeated use of reference characters in the present invention and in drawings, is intended to represent the same or analogous characteristics or elements of the invention DETAILED DISCLOSURE OF PREFERRED EMBODIMENTS It will be understood by those skilled in the art that the present discussion is a description of the exemplary embodiments only and is not proposed as limiting the broader aspects of the present invention, which broader aspects are implemented in the exemplary construction With reference to FIG. 1, a mandrel according to an embodiment of the present invention is illustrated and designated in general by the numeral 15. While the description herein refers to an electric drill, it should be appreciated that any suitable type of device requiring a mandrel could be used with the mandrel of the present invention or With reference to figures 1 to 3, the mandrel 15 includes a generally cylindrical body element 20, having a nose section 25 or front and a tail section 30 or later. The tail section 30 may include a threaded hole 35 for receiving the drive spindle or shaft of an actuator such as a bore. While a threaded hole is illustrated, it should be appreciated that such could be a tapered hole for attachment to a tapered spindle or any other type of attachment mechanism that would be appropriate in the desired environment. The body member 20 includes a thrust ring 45 that is integral therewith. However, it should be appreciated that the thrust ring 45 could be a separate component fixed on the body member 20. The nose or front section 25 of the body member 20 defines an axial bore 55 and a plurality of passages or passages 60 angularly disposed flush and intersecting with the axial bore 55. The axial bore 55 is of sufficient size to receive the larger diameter tool, such as the heel of a drill bit, that a particular size mandrel is configured to accommodate. A plurality of jaws 65 are slidably positioned in each of the steps or passages 60 arranged angularly. Each of the jaws has a face 70 formed on one side thereof to engage with a tool, such as a drill bit heel 71 (Figure 2), to be retained therein. Each of the jaws 65 also includes threads 75 formed on the opposite side of the faces 70 of the jaw. In accordance with the present invention, the threads 75 on the jaws 65 may be relatively coarse if desired.

A nut or clamping ring 80 with internal threads 85 is recessed on the body 20 in front of the thrust ring 45. The threads 85 on the nuts engage with the threads 75 on the jaws, such that when the nut is put into operation in a tightening direction, the jaws will be moved forward or towards the nose of the mandrel and when the nut is rotates in a loosening direction, the jaws will be retracted or moved towards the tail section of the mandrel. The use of relatively coarse threads on the jaws and nuts minimizes the number of rotations of the nut required to move the jaws through their full range of motion. The nut 80 is preferably a one piece or a unitary nut. The body 20 is of a reduced diameter in the nose section 25, such that the nut 80 can be received thereon. While a nut piece is preferred, it should be appreciated that a two-piece or split nut could be used, which could be held together by a band, the sleeve, spot welding or the like. As shown in Figure 3, the nut 80 includes portions 85 that receive the drive catch to receive the drive detents located in a sleeve as will be summarized in more detail below. Referring to Figures 1 to 3, a sleeve member 90 is illustrated. Since the sleeve member 90 is superimposed on the nose section 25 of the body member 20, it is also known as a front sleeve. The front sleeve 90 is in mating engagement with the nut 80, such that when the front sleeve 90 is rotated with respect to the body member 20, the jaws 65 will be opened or closed, depending on the rotational direction of the body. front sleeve 90. The drive coupling n between the front sleeve 90 and the nut 80 can be by any known arrangement. In a preferred embodiment, the front sleeve 90 may include drive pawls or detents 91 that contact the portions 81 that mesh the pawl in the nut 80 to rotationally secure the front sleeve 90 to the nut. 80. In another embodiment, the front sleeve 90 could be snapped onto the nut as is well known in the art. It should be appreciated that the front sleeve 90 could be of any known material, such as plastic, metal or combinations thereof, as well as any suitable composite material. In the preferred embodiment, as illustrated in Figures 1 to 3, the front sleeve 90 is received over the nose section 25 of the body 20 and includes a flange 92. A spring element 93 is recessed over the portion 25 of nose of the body 20 and a retaining element 94 is pressed on the end of the nose section 25 of the body, with a projecting portion rearwardly of the retention element 94 which is superimposed on the flange 92. The spring element 93 It is placed between the flange 92 and the retaining element 94 and serves to preload the nut 80 in the backward direction (towards the tail section 30) through the sleeve 90. The spring element 93 is preferably a spring type like it is best illustrated in figure 3, but could be any appropriate type of spring, such as a belville washer, coil spring or the like. The front sleeve 90 is held in place by the retaining element 94, which can also serve as a decorative nose piece. However, it should be appreciated that the retention element 94 could be any suitable retention element, such as a spring clip or the like.

As shown in Figure 2, the retention element 94 may also include a seal 96 against dust, to prevent dust and debris from entering the mandrel, such seal being composed of rubber, bristles or any other suitable material or configuration A mandpl according to a preferred embodiment of the present invention also includes a complementary appete mechanism With reference to figures 1 to 3, the complementary appete mechanism is generally indicated by the number 95 and measures a cam portion 100. As shown in FIG. 3, the cam portion 100 produces an appete cam profile indicated generally by the number 105. The poraon 100 cam is rotatable with respect to the tail section 30 of the body member 20 In a preferred embodiment the cam portion 100 is received within a post sleeve 115 that is rotatably received on the tail section 30 on the element Body 20 The cam pointer 100 may be integral with the pole sleeve 115, pressed therein or otherwise attached to the rear sleeve 115 (such as by adhesives) For a preferred embodiment as best illustrated in Figures 3 and 5 -7, the cam portion 100 is rotationally fixed to the post-tension sleeve 115 by locating bolts 104 that protrude axially inward from the pole sleeve 115 and are reamed in the cut-outs 114 of the Cam 100 As better illustrated in Figures 1-3, the pole sleeve 115 can be retained in a rotatable fashion on the tail dryer 30 of the body member 20, by means of a rear retention element 155, which it can be snapped onto the tail dryer 30 of the body 20 It should be noted that any suitable type of retention element could be used, such as for example a spring clip. With reference to Figures 1-4 and 8, the complementary clamping mechanism further includes a plurality of lever bars 120. As shown in Figures 5-8 for example, each lever bar 120 includes a portion 125 of a follower 125 cam, located preferentially on one end of it. Additionally, each lever bar has a portion operatively associated with the nut 80, such that when the complementary tightening mechanism is actuated by the rotation of the cam portion 100, each lever bar 120 will urge the nut 80. forward towards the nose section 25, to produce an improved tightening force on the tool retained by the jaws 65. As shown in Figure 4, for example, the portion 125 of the cam follower is received between the surface of the cam portion 100 defined by clamping cam profile 105 and inner circumferential surface 110 of rear sleeve 115. In a preferred embodiment shown in Figure 4, for example, each lever bar 120 includes three sections. The cam follower portion 125 is substantially drcular in preference and is of a smaller diameter than the diameter of a medium pore 116, which joins the cam follower portion 125 to the nut contact portion 117, designated in general. by the number 117. As shown in Fig. 8, for example, the contact portion 117 of the nut induces a flat face 118 to be brought into contact with the nut 80 and a seating surface 119 configured in a spherical shape for the seating in a coupling portion 130 in the thrust ring 45 of the body member 20. Thus, the coupling lug 130 is also or configured in a spherical shape corresponding to the shape of the seating surface 119, such that the coupling portion 130 can rotatably receive the seating surface 119 therein. As shown in Figures 3 and 8 for example, the thrust ring 45 also defines a radially disposed slotted portion 135, to allow each lever bar 120 to rotate radially with respect to the axial center line of the body member 20 of the mandrel. , but to prevent movement of the lever bar in a circumferential or tangential direction with respect to the axial center line of the body member. The slotted portions 135 help to prevent misalignment of the lever bars 120 during the operation of the complementary clamping mechanism. As shown in figures 1, 2 and 8, a shoulder 220 of the jaw serves to limit the travel or travel of the jaws 65 in the backward or opening direction. The jaw retaining flange 220 is arranged in such a way that the jaws 65 will abut the shoulder at its most rearward position to prevent attachment between the jaws and the nut 80. As shown in Figure 2, for example , the retaining flange 220 includes passages or passages 221 to allow the lever bars 120 to extend therethrough. The passages or passages 221 also help to prevent undesirable drcunferencial movement of the lever bars 120. As long as it is illustrated unitary with the body 20, it should be appreciated that the retaining flange 220 could be a separate component that is secured to the body. Figures 5 to 7 illustrate a preferred embodiment of the cam portion 100, which includes a clamping cam profile composed of a repeated (or cyclic) plurality of the particular cam profiles. Each cycle of cam profiles corresponds to one of the three lever bars 120 in the mode shown. Each particular cam profile in one spoke is configured to extend radially from the axial center line of the body member 20 to a different radial distance to each of the other cam profiles in that profile die in the cam profile 105 of the cam. tightening of the cam element 100. The preferred clamping cam profile 105 of the cam member 100 includes a splined cam or release profile, indicated at 165. As shown in Figures 3, 6 and 7 for example, the cam profile 165 is at least the minimum radial distance from the axial centerline of the body member 20 is provided to the other cam profiles in each profile section. As shown in Figures 5-7, a clamping cam profile 107 is disposed at a greater radial distance from the axial center line of the body member 20 than the initial cam profile 165. The clamping cam profile 107 is of a portion of substantially uniform diameter. A transition cam profile 106 is disposed at a radial distance from the axial center line of the body member 20 which varies gradually from the minimum radial distance of the initial cam profile 165 to the largest radial distance of the cam cam profile 107. The transition cam profile 106 is an outwardly inclined portion which causes the cam follower portions 125 of the lever bars 120 to move radially outwardly relative to the axial center line of the body member 20, to the position shown in solid lines in Fig. 4. As shown in Figs. 5-7, the clamping cam profile 105 further includes a blocked cam profile 108, disposed at a radial distance from the axial center line of the cam member. body 20, which varies gradually from the radial distance of the clamping cam profile 107 to a radially increased distance from a drive profile cam 109 (continuously decoupled) Thus, the locked cam cam profile 108 forms another radially outwardly inclined portion serving as retained locked position for the portion 125 of the cam follower of the lever bar 120 According to the present invention, to prevent adhesion, that is, a condom where it is difficult to release the complementary appete mechanism, means are provided for the release of the drive through the complementary clamping mechanism As implemented herein and shown in figure 3 , for example, the means for the release of the drive through mechanism 95 of the complementary device are implemented by means of the cam profile 105, which is configured to include a cam profile 109 of a through drive arranged at a greater radial distance from the centerline. axial of the body element 20, that the cam profile 107 of appete As shown in figures 5 to 7 for example, the cam profile 105 has been configured to allow a user to propel the sleeve 115 through the blocked position (with the portions 125 of the cam follower in the retaining cam profile 108 locked) to the metal position, this is released (with the polars 125 of the cam follower in the cam profile 175) without the need to reverse the rotatational direction of the pole sleeve 115 The user can do this by providing a rotational force adiaonal to the rear sleeve 115 in the appete address after the cam follower has engaged with the blocked cam lock profile 108 This will cause the cam follower 125 to move to the slope of the lock cam profile 108 locked to the drive cam profile 109 and after the prolonged rotation, move to the initial cam profile 175. This arrangement allows a user to deploy the "clamping mechanism" complementary to through the posidon blocked to the released position if difficulty is experienced in the normal release of the complementary tightening mechanism. It should be appreciated that it is the functionality of the various cam profiles, not the exact shapes, which is important for certain embodiments of the present invention. Accordingly, any profile configuration appropriate for carrying out the general movements of the cam followers would be within the scope of the present invention. An explanation of the operation of the mandrel 15 proceeds as follows. In Figure 4, dashed lines are used to illustrate the lever bar 120 in a released position, prior to actuation of the complementary clamping mechanism, while the solid lines are used to show the lever bar 120 in an ac position. onada of the mechanism 95 of complementary tightening. Reference is made to the position where the lever bars 120 are in the dotted line position shown in FIG. 4 and the rear sleeve 115 is in the position as shown in FIGS. 1 and 5, where the portions of FIG. 125 of the cam follower are located at the top of the clamping cam profile 105 illustrated at 175 and the jaws 65 are retracted within the mandrel an amount sufficient to reopen the bead of a drill bit or the like. After rotating the front sleeve 90 in a tightening direction, which is normally in the clockwise direction, if viewed from the front or nose section of the mandrel, the jaws 65 will be caused to move. move forward until they contact the heel of the drill bit, after such contact, the heel will be retained within the jaws of the mandrel. At that point and as best illustrated in FIGS. 2 and 6, the post-tensioner sleeve 115 is actuated in the direction of the appete, which is generally in the direction opposite to the clockwise rotation, as illustrated in the embodiment of Figures 2 and 6 As the post-tensioning sleeve 115 is actuated, the cam mechanism 100 is caused to rotate and the portions 125 of the cam follower move along the transition profile 106 of the profile 105 of the appete cam and the poles 125 of the cam follower are urged outward, with respect to the axial center line of the body member 20 As the portions 125 of the cam follower move about the slope on the profile 106 of the transition cam, the portions 125 fl) of the cam follower move outwardly relative to the axial centerline. The portion 117 of contact with the nut of each lever bar 120 is rotated with the surface 119 which acts as the fulcrum, in such a way that the contact portion 117 acts to move the nut 80 forward towards the dryer 25 Napz of the body element 20 and to thereby provide an additional tightening force by means of the jaws 75, by virtue of the axial force placed on the nut 80. In this respect some axial movement is permitted. e the nut 80 by means of the spring 93, to allow the nut to move forward when the mechanism 95 of complementary mechanism is actuated in operation, as the tightening mechanism ppmapo is 0 driven (ie, rotation of the nut 80). with respect to the jaws 65), the jaw and nut arrangement is preloaded in the backward direction. After this, the hardening of the complementary mechanism 95 is effective to improve the total hold forces of the mandl, this movement continues, until that the pounders 125 of the cam follower reach the blocked retentional profile 5 indicated as 108 in Figures 5-7 n When it is desired to release the drill bit from the drill or the tool that is retained by the jaws, the pole sleeve 115 is rotated in a release direction, which is opposite the appete address and the portions 125 of the cam follower move along the intepor of the rear sleeve until it is made returning to its miaal position at 165 If difficulty is experienced in rotating the rear sleeve 115 in the release direction due to adhesion or the like, the pole sleeve 115 can be released by means of the through drive mechanism, by rotation Further in the direction of appete as it is abruptly disengaged in the present After this, the front sleeve 90 can be rotated with respect to the body member 20 in a release direction to retract the jaws 65 back to the mandrel to release the tool which is retained by the same It should be noted that the lever bars 120 rotate with respect to the body element 20, but that the particular porad or configuration of the contact portion 117 of the lever bar 120 which comes into contact with the nut or that can be put in contact with another component which applies force to the nut, is not critical for all the modalities of the pre present invention In a preferred embodiment, resilient means are provided to prevent the appete mechanism 95 from acting before closing the jaws 95 on a tool. As implemented herein and with reference to FIGS. 3, 4 and 9, the resilient means , they can include a washer 180 secured to the tail dryer 30 of the body member 20 As shown in Figure 3, the washer 180 removes resilient portions 185 adjacent the openings 190 With referencing more particularly to Figure 9, the means Resilients further include a ramp element 195 which is operatively secured to the rear sleeve 115 for rotating therewith. In the embodiment shown, such operative securing is effected because the ramp elements 195 are formed in the cam portion 100, which is brought into contact with locating or locating pins 104, which are fixed to the rear sleeve 115 . The ramp element 195 includes ramps 200, which rest against the ramp portions 205 on the washer 180. In operation, the washer 180 is fixedly attached to the tail section 30 of the body member 20 and the ramp element 195 is fixedly attached to the rear sleeve 115 for rotation therewith in relation to the body element 20. As implemented in FIG. the present and shown in Figure 3 for example, the internal configuration of the washer 180 includes a flat portion 181 and the diameter of the tail section 30 of the body member 20 is provided with a correspondingly shaped flat portion 182, such that when the washer 180 is placed on the tail section 30, the washer 180 and the body 20 will move in a rotating direction as one. As shown in Figure 9 for example, the ramps 200 of the ramp element 195 engage the ramp portions 205 on the washer 180 and prevent rotation of the rear sleeve 115 with respect to the body member 20, provided that the ramp portions remain undefined in their trapezoidal cross-sectional shape, as shown in Figure 3 for example. When sufficient force is applied to the rear sleeve 115, which force is transmitted by means of the ramp element 195 to the resilient portions 185 on the washer 180, the resilient portions 185 will flex and allow the ramps 200 to move over the portions. 205 and by this they allow the rotation of the rear sleeve 115 with respect to the body element 20. This structural arrangement prevents the rear sleeve 115 from being clamped before the application of a desired force, which can be controlled by the resilient of the resilient portion 185 of the washer 180. This ensures that the front sleeve 90 will be able to abut the jaws 65 on contact with the bead or shank of the bit or the like, before the rear sleeve 115 acdone the clamping mechanism complementary. It should be appreciated by those skilled in the art, as illustrated in Figure 10, that prominent ramps 201 could be operatively associated with rear sleeve 115 and hollowed trap portions 205 could be located formed in washer 180. The operation it would be substantially as described above. It should also be appreciated that the ramp elements 195 or 201 could be unitary with the rear sleeve 115 or a separate component or could be constructed thereof or of a different material such as the rear sleeve 115 and / or the cam porridge 100. Also it should be noted that other configurations, in addition to the ramps, could be used to provide the same function or an equivalent function as described. With reference to Figure 3, various mechanisms for fixing the washer 180 on the tail section 30 of the body element 20 could be used. In a preferred embodiment, the internal diameter of the washer 180 is irregularly formed and a poron of the tail section 30 of the body member 20 is also irregularly formed in a coupling configuration. It may also be desirable to have friction reducing support means located between the rear sleeve 115 and the tail end 30 of the body member 20, to reduce friction as the rear sleeve 115 rotates with respect to the body member 20. support means could be of any known construction, such as ball bearings, with an internal bearing surface and a corresponding outer bearing surface. It should be appreciated that any suitable bearing or bearing means could be used in which bearings of the bearing are included. single or double roller or the like, the selecaon of which would be within the reach of those experienced in the art These and other modifications and vapaaons to the present invention can be carried out by those of ordinary skill in the art, without deviating from the scope of the present invention, which is summarized more particularly in the reivi In addition, it should be understood that the aspects of the various modalities may be exchanged in whole or in part. In addition, if the personnel are exposed to the technique, they shall understand that the prior disclosure is by way of example only and is not intended to be limiting of the Inventor as it is adiaonally deciphered in such appended claims It is noted that in relation to this date, the best method known by the applicant to carry out the tied invention, is the conventional one for the manufacture of the objects that are thereto. The invention having been described as above, property is claimed as contained in the following

Claims (20)

1. Claims 1. A mandrel for use with a manual or electric controller or sprayer, having a rotating drive shaft, the spindle is characterized in that it comprises: (a) a generally cylindrical body member having a nose or forehead section and a tail or tail section, the tail section is adapted to be coupled with the drive shaft of the actuator and the nose section has an axial orifice formed therein and a plurality of angularly disposed passages or passages formed therethrough and that are intercepted with the axial hole; (b) a plurality of jaws slidably positioned in each of the angularly disposed passages or passages, each of the jaws has a jaw face formed on one side thereof, to be brought into contact with a tool to be retained by the same and threads formed on the opposite side thereof for coupling with a nut; (c) a nut mounted rotatably with respect to the body member and in engagement with the threads on the jaws; (d) a sleeve element in drive engagement with the nut, such that when the sleeve member is rotated with respect to the body member, the jaws will be moved therewith; (e) a complementary tightening mechanism, configured and arranged to drive the nut toward the nose section and thereby cause the jaws to produce an improved tightening force on the tool; and (f) means for the release of the pass-through of the complementary clamping mechanism.
2. 2 A mandpl for use with a manual or electric handler or handler in accordance with claim 1, characterized in that the release means of the through drive of the complementary clamping mechanism includes a plurality of cam profiles, formed in the complementary mechanism of the appendage.
3. 3 A mandpl for use with a manual or electric handler or regulator according to claim 2, characterized in that the complementary appete mechanism includes a cam portion rotatable with respect to the body member, and each cam profile extends radially from the axial center line of the body element at a radial distance different from that of the other profile, the cam poraon includes an initial cam profile disposed at a minimum radial distance from the axial center line of the body member than the other of the profiles of In this case, the cam portion forms an appete cam profile disposed at a greater radial distance from the axial centerline of the body member than the cam profile, the campet induces a transition cam profile disposed at a distance. radial from the axial center line of the body element gradually varying from the minimum radial distance from the initial cam profile to the distana radial profile of the appete cam
4. 4 A mandpl for use with a manual or electric handler or handler according to claim 3, characterized in that the cam pointer includes a running cam profile disposed at a greater radial distance from the axial center line of the body member. the appete cam profile, the cam portion includes a retaining cam profile disposed at a radial distance from the axial center line of the body member that varies gradually from the radial distance of the profile of the clamping cam to the radial distance higher profile of the driving cam through.
5. 5. A mandrel for use with a manual or electric actuator or controller according to claim 3, characterized in that: the complementary clamping mechanism includes a plurality of lever bars, a portion of each of the lever bars forming a cam follower and another portion of each of the lever bars is operatively fastened with the nut, such that when the complementary clamping mechanism is actuated by rotation of the cam portion, the lever bars will propel the nut to the Nose section and this will cause the jaws to produce an improved tightening force on the tool; the transition cam profile is configured to cause the cam followers to move outwardly relative to the axial center line of the body member when the rear sleeve is driven in a tightening direction and where the inital cam profile is It is configured to cause the cam followers to move inside, with respect to the axial centerline of the body member, when the rear sleeve is supported in a releasing grip.

   6. A mandrel for use with a manual or electric actuator or controller according to claim 1, characterized in that: the complementary clamping mechanism includes a rotary cam portion with respect to the body member, the complementary clamping mechanism further induces a plurality of lever bars, one poraon of each of the lever bars forms a cam follower and another portion of each 5 one of the lever bars is operatively associated with the nut, such that when the complementary clamping mechanism is supported by the rotation of the cam portion, the lever bars will drive the nuts to the nose section and by this they will cause the jaws to produce an improved tightening force on the tool. tt 7. A mandrel for use with a manual or electric shooter or controller according to claim 1, characterized in that it further comprises resilient means for preventing the complementary tightening mechanism from being actuated before closing the jaws on the tool. 8. A mandrel for use with a manual or electric actuator or controller according to claim 7, characterized in that: the complementary clamping mechanism includes a rotating cam portion with respect to a body member; and the resilient means includes a first element associated with the cam portion and a second element associated with the body member, at least one of the first and second elements has a resilient portion which engages with a portion of the other , to restrict the rotational movement between the two until the resilient portion is exceeded. 5. A mandrel for use with a manual or electric coil or controller according to claim 8, characterized in that the sleeve is superimposed on the nose section of the body member and the mandrel further includes a rear sleeve, one of the first and second elements, is fixedly attached to the rear sleeve and the other of the first and second elements are fixedly attached to the body member.

   10. A mandrel for use with a manual or electric actuator or controller according to claim 8, characterized in that the resilient portion is coupled with a ramp section on the other of the first and second elements.

   11. A mandrel for use with a manual or electric driver or actuator according to claim 7, characterized in that the resilient means include a first element associated with the rear sleeve and a second element associated with a body element, at least one of the first and second elements has a resilient pordon which engages with a portion of the other, to restrict rotational movement between the two until the resilient portion is exceeded.

   12. A mandrel for use with a manual or electric coil or controller according to claim 1, characterized in that: the complementary clamping mechanism includes a cam portion rotatable with respect to the body member; and the mandpl includes a rear sleeve and wherein the cam poran is operatively attached to the pole sleeve. 13 A mandpl for use with a hand-held or electric handler or controller according to claim 12, characterized in that the cam portion has a profile configured to cause the pointer of the follower of the lever bar to move outwardly relative to the axial center line of the body element, when the pole sleeve is rotated in a tightening direction 14 A mandpl for use with a manual or electric handler or controller according to claim 13, characterized in that the cam portion has a transition cam profile and an initial cam profile. 15 A mandpl for use with a manual or electric actuator or controller according to claim 14, characterized in that the miatal cam profile is configured in such a way that, when the rear sleeve is rotated in a loosening direction, the profile The cam will cause the lever bars to move inward toward the axial center line of the body member and thereby release the forward force on the nut, caused by the lever elements. 16 A mandpl for use with a manual or electric actuator or controller having a rotating drive shaft, the mandrel is characterized in that it comprises (a) a generally dylindrical body member, having a nose or front section or a secundary section. tail or rear, the tail section is adapted to be coupled to the spraying axis of the driver or actuator and the nose section has an axial orifice formed therein and a plurality of angularly-formed passageways or passages formed therethrough and that intersect with the axial hole; (b) a plurality of slidably disposed jaws in each of the angularly disposed passages or passages, each of the jaws has a jaw face formed on one side thereof to engage with a tool to be retained by the same and threads formed on the opposite side thereof for coupling with a nut; (c) a nut mounted rotatably with respect to the body member and in engagement with the threads on the jaws; (d) a front sleeve element in drive engagement with the nut and which is superimposed on the nose section of the body member, such that when the front sleeve member is rotated with respect to the body member, the jaws will be moved by it; (e) a complementary tightening mechanism configured and arranged to force the nut towards the nose section and thereby cause the jaws to produce an improved tightening force on the tool; and (f) a spring element configured and arranged to resiliently drive the front sleeve member to the tail section of the body member.

   17. A mandrel for use with a manual or electric actuator or controller, having a rotatable bend axis, the mandrel is characterized in that it comprises: (a) a generally cylindrical body member having a nose or front section and a cross section tail or rear, the tail section is adapted to be coupled with the spraying axis of the driver or actuator, the nose section has an axial hole formed therein and a plurality of angularly disposed passages or passages, formed therethrough and intersecting with the axial orifice, the axial orifice is arranged symmetrically about an axial center line; (b) a plurality of jaws slidably positioned in each of the angularly disposed passages or passages, each of the jaws has a jaw face formed on one side thereof to engage with a tool to be retained by the same and threads formed on the opposite side thereof for coupling with a nut; (c) a nut mounted rotatably with respect to the body member and in engagement with the threads on the jaws; (d) a front sleeve element in drive engagement with the nut and which is superimposed on the nose section of the body member, such that when the front sleeve member is rotated with respect to the body member, the jaws will be moved by means of the same, (e) a complementary tightening mechanism, the complementary appete mechanism includes a rotary cam portion with respect to the body element, the complementary tightening mechanism further induces a plurality of lever bars, a poraon of each of the lever bars forms a cam follower and another portion of each of the lever bars is operatively associated with the nut, such that when the complement mechanism is activated by rotating the lever of In this case, the lever bars will propel the nut towards the napz section and thereby cause the jaws to produce an improved appete force on the tool(f) a thrust ring disposed on the body member and extending radially from the body member, the thrust ring defines at least one coupling surface configured with an escutcheon shape to rotate one of the lever bars, and (g) wherein a lever bar has a seating surface configured with an esplanade shape for its pivotal movement against the coupling surface formed substantially from the thrust ring, the seating surface of the lever bar being receives in a rotational fashion on the coupling surface of the thrust ring 18 A mandpl for use with a manual or electric handler or controller according to claim 17, characterized in that the thrust ring defines a slotted portion communicating with the coupling portion and configured to allow the lever rod to rotate radially with respect to to the axial center line of the body element A mandpl for use with a manual or electric handler or driver according to claim 17, characterized in that the thrust ring defines a slotted portion communicating with the coupling portion and configured to allow the lever rod to rotate radially with respect to to the axial center line of the body element; and the slotted portion prevents movement of the lever bar in a circumferential direction with respect to the axial center line of the body member.

   20. A mandrel for use with a manual or electric actuator or controller according to claim 17, characterized in that: the thrust ring defines a slotted pordon communicating with the coupling portion and configured to allow the lever bar to rotate radially with respect to to the axial center line of the body element; and the slotted portion prevents movement of the lever bar in a tangential direction with respect to the axial centerline of the body member.