WO1989011368A1 - Mandrin sans clavettes - Google Patents

Mandrin sans clavettes Download PDF

Info

Publication number
WO1989011368A1
WO1989011368A1 PCT/US1989/001945 US8901945W WO8911368A1 WO 1989011368 A1 WO1989011368 A1 WO 1989011368A1 US 8901945 W US8901945 W US 8901945W WO 8911368 A1 WO8911368 A1 WO 8911368A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
jaws
split nut
chuck
rotation
Prior art date
Application number
PCT/US1989/001945
Other languages
English (en)
Inventor
Bernhard Palm
Original Assignee
Milwaukee Electric Tool Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/199,842 external-priority patent/US4958840A/en
Application filed by Milwaukee Electric Tool Corporation filed Critical Milwaukee Electric Tool Corporation
Publication of WO1989011368A1 publication Critical patent/WO1989011368A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/1207—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
    • B23B31/1238—Jaws movement actuated by a nut with conical screw-thread
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/06—Chucks for handtools having means for opening and closing the jaws using the driving motor of the handtool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2231/00—Details of chucks, toolholder shanks or tool shanks
    • B23B2231/38—Keyless chucks for hand tools

Definitions

  • An object of this invention is to avoid stressing the press fit with impact energy and thereby improve the reliability of keyless impacting chucks.
  • the impacting faces on the impacting lugs are inclined to the axis of the chuck at a different angle depending upon whether it is opening or closing the jaws.
  • the impact angle is greater in the opening direction than in the closing direction, thus ensuring the force which can be delivered to open the jaws will always be greater than that which will be delivered to close the jaws. In theory this means it will always be possible to open the jaws to remove the tool.
  • the drawback with this arrangement is possibility to drive the jaws open into wedging contact with the chuck body with such force that the force available in the closing direction cannot free the jaws.
  • This invention provides impact lugs directly on the split nut so that when these lugs are in engagement with the lugs which are restrained against rotation, the impact is delivered directly to the split nut and the retainer (collar) does not transmit the impact energy.
  • the retainer simply performs its functions of retaining the split nut in assembled position.
  • This invention provides an actuating member operative to axially move interference members or lugs into or out of engagement with interference members of lugs associated with the split nut in a chuck. Assuming the chuck is driven by the spindle, when the axially movable interference members engage the split nut interference members and are restrained from rotation, the nut is also restrained and the chuck jaws open or close depending upon the direction of rotation of the chuck body. The actuating member is positioned to be engaged by the jaws as they approach full open position. The jaws then move the actuating member rearward to disengage the interference members and stop further opening of the jaws before they reach a position to weage or jam in the open position.
  • the actuating member is a sleeve on the chuck body.
  • the sleeve has an inside groove engageable by the jaws.
  • the groove is shaped to present a surface generally normal (perpendicular) to the jaw travel.
  • a further feature is that the axially movable interference members are a part of the sleeve.
  • Fig. 1 is a side elevation of a power drill fitted with a chuck incorporating this invention.
  • Fig. 2 is a vertical section through the chuck mounted on a novel drive spindle.
  • Fig. 3 is a section taken on line 3-3 in Fig. 2.
  • Fig. 4 is a section taken on line 4-4 in Fig. 2.
  • Fig. 5 is a fragmentary schematic view of the lugs.
  • Fig. 6 is a vertical section through a slightly modified chuck (not modified relevant to the mount) threaded on a standard threaded spindle.
  • Fig. 7 is a vertical section through still another chuck.
  • the hand drill 10 has a conventional pistol grip 12, a trigger 14 actuating the power switch and a forward/reverse control 16.
  • Gear case 20 is mounted on the front portion of the drill housing by screws 86 and encloses the customary reduction gearing. Grooves 84 in case 20 give screwdriver access to screws 86.
  • Drive spindle 18 projects out of the front of the gear case 20 and is journaled in bearing 68 retained by tru-arc retainer 69.
  • the spindle has a smooth cylindrical mount 15 beyond shoulder 17 and a reduced diameter end 19 beyond the mount 15.
  • the spindle is reduced at 21 between mount 15 and shoulder 17 to ensure that face 23 can be squarely engaged by shoulder 25 on chuck body 24 when the smooth bore 27 in the body is mounted on the mount 15.
  • the diametrically opposed lugs 29 on spindle 18 engage the slots 31 in the body flange.
  • the threaded bore 35 in the body fits over the reduced end 19 of the spindle 18.
  • the threads 35 serve no purpose at this time; they are used to mount the chuck on a mandrel during production of the chuck to enable final grinding of the jaws concentric with the chuck body so that jaws will be concentric with the spindle 18 when the chuck is mounted on a spindle.
  • the chuck is retained on the spindle 18 by screw 26 threaded into the end of the spindle. No torque is transmitted through the threaded connection of the chuck to the spindle through screw 26. All torque is transmitted through the drive lugs 29. Therefore, the chuck is easily removed by pulling it off and when driven in reverse screws (like 26) can no longer break.
  • This mount is applicable to keyed and to keyless chucks.
  • the body is provided with three inclined bores 28 in each of which there is mounted a jaw 30 which moves in the inclined bore 28 in response to relative rotation between the split nut 32 and the jaws.
  • Split nut 32 is retained in assembled position by split nut retainer 34 which is in the form of a ring-like collar having a force fit on the split nut.
  • the retainer 34 and the split nut normally rotate with the body 24, but if the split nut and retainer are restrained from rotation the rotation of the body relative to the split nut will cause the jaws 30 to open or close by moving up or down the inclined bore as determined by the direction of the rotation of the body.
  • Clutch sleeve 36 is provided with lugs 38 facing lugs 40 on the split nut 32. If the clutch sleeve 36 is moved to the left in Fig. 2, lugs 38 engage lugs 40.
  • the right end of sleeve 36 has inwardly projecting flange segments 48 and a spline ring 80 has inturned flange segments 58 which fit between segments 48 with spring 56 compressed between the spring seats thus provided.
  • Spline ring 80 can be restrained against rotation by tightening screw 79 into nut 81 until it firmly engages gear case 20. This restrains the sleeve 36 against rotation.
  • the split nut 32 will also be restrained against rotation causing relative rotation between the body 24 and the split nut 32. This will cause the jaws 30 to move up or down the inclined bores 28 to open or close the jaws depending upon the direction of rotation of the clutch body 24.
  • Fig . 5 deta ils of lugs 38 and 40 are shown.
  • the jaws 30 will open or close depending upon whether spindle 18 and chuck body 24 are being driven in the forward (F) or reverse (R) direction. Assume the chuck is being driven in the forward (F) direction.
  • Interengaging faces 42, 44 on lugs 38, 40, respectively, are inclined at 27° with respect to the axis of the chuck, as seen in Fig. 5. This is a rather steep angle and will deliver a very sharp impact to the lugs 40 tending to forceably close the jaws.
  • the face angles will act to cam the clutch sleeve 36 towards the gear case to disengage the lugs.
  • Opening the chuck is another matter.
  • the forward/reverse switch 16 is actuated to now drive the chuck in reverse direction (R).
  • R reverse direction
  • the inclined faces 64, 66 are inclined at 23° to the axis of the chuck, as may be seen in Fig. 5. This is 4° less than the angle in the jaw closing configuration. This will develop more tangential force on the split nut 32 in the direction opening the jaws than obtained with the 27° face angle in the closing direction. Therefore, opening is assured and there is no need to provide for operation of the chuck with a key or a chuck wrench.
  • the system will deliver sufficient, repeated impacts to open the chuck. It may not open on the first impact, but with the operator holding the sleeve forward, a rapid, series of impacts will be delivered until the chuck opens.
  • An impact can be considered a force spike of much greater magnitude than the friction between the parts.
  • a problem arises, however, if the operator holds the sleeve 36 to drive the jaws 30 to the full open position. Without the present invention, this can result in the jaws wedging in the open position. Since they have been driven open with an impact greater than can be delivered in the closing direction, they can be irrevocably wedged in the open position. This problem is obviated in the present design by locating the clutch sleeve in position to be engaged by the jaws and providing the undercut 46 inside the clutch sleeve 36 in position to receive the inner end of each jaw 30, as shown in dotted lines in Fig. 2.
  • the spring biases the sleeve 36 to the right with retainer ring 70 limiting travel to the right.
  • the clutch sleeve 36, spring 56, ring 70 and ring 80 are assembled on the chuck before the chuck is mounted on the spindle.
  • the spline ring 80 prevents rotation of the clutch sleeve and when the user pushes the sleeve forward to engage the lugs the sleeve is subject to reciprocating motion as the lugs engage, impact and push the sleeve back and then the user pushes it forward again. If desired the ring 80 can be allowed to rotate. This will result in the clutch sleeve being free to rotate slightly due to impact. The slight rotational force imparted to the sleeve is resisted by the user who can't detect or feel the difference. There is some loss of impact force or magnitude due to the slight rotation of the sleeve on impact.
  • An important feature of this invention is the automatic disengagement of the sleeve before the jaws have an opportunity to get wedged in the full open position.
  • Another important feature of this invention is the nature of the clutch sleeve 36.
  • the spline ring 80 prevents rotation of the clutch sleeve and when the user pushes the sleeve forward to engage the lugs the sleeve is subject to axial reciprocating motion as the lugs engage, impact and push the sleeve back and then the user pushes it forward again.
  • the cost of restraining rotation can be avoided by omitting the spline ring. This will result in the clutch sleeve being free to rotate.
  • the slight rotational force imparted to the sleeve is resisted by the user who can't detect or feel the difference. There is some loss of impact force or magnitude due to the slight rotation of the sleeve on impact. Also, some users are reluctant to grasp a rotating part and for them the non-rotational sleeve is preferred.
  • FIG. 7 Another variation, and a great simplification, is shown in Fig. 7 in which spring 156 biases the sleeve 136 to engage the lugs 138, 140 at all times with the jaws still operative to disengage the lugs before they can jam open.
  • Spring 156 is compressed between the corner 137 (inside the sleeve) and the shoulder 170 machined on the body 124. This is the lug drive version but it can be either.
  • the lugs 129 engage the recesses 131.
  • the sleeve 136 normally rotates with the chuck and the user then restrains the sleeve to open or close the chuck.
  • Fig. 7 represents the f inal ( cur rent ) des ign .
  • Th is more compact and "looks" more conventional. It still mounts on the threaded or unthreaded spindles, automatically disengages, and avoids torque transmission through the press fit.
  • This design also has an advantage in that the radial slots 131 permit screw driver blade access to the spring 156 when the chuck is off the drive spindle.
  • the spring can be removed for service in this manner.
  • the chuck can't be mishandled to damage the spring when the chuck is off the tool.
  • spr ing 156 " goes solid " and l imits sleeve travel and this in turn prevents overstressing the spring.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)
  • Adornments (AREA)

Abstract

Un manchon axialement mobile (36) comprend des éléments d'enclenchement ou des tétons (38) associés à la vis mère (34) d'un mandrin. Lorsque le mandrin est entraîné par l'arbre (18), les éléments d'enclenchement (38) axialement mobiles enclenchent les éléments d'enclenchement (40) de la vis mère, ce qui les empêche de tourner. La vis mère (34) est elle aussi retenue et les mâchoires (30) du mandrin s'ouvrent ou se referment selon le sens de rotation du corps (24) du mandrin. Le manchon (36) est positionné de façon à être enclenché par les mâchoires (30) lorsqu'elles s'approchent de leur position complètement ouverte. Les mâchoires (30) déplacent alors axialement le manchon (36), libérant les éléments d'enclenchement (40, 38) et arrêtant l'ouverture des mâchoires (30) avant qu'elles ne se coincent ou ne se bloquent dans la position ouverte.
PCT/US1989/001945 1988-05-27 1989-05-04 Mandrin sans clavettes WO1989011368A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US199,842 1980-10-23
US19984188A 1988-05-27 1988-05-27
US199,841 1988-05-27
US07/199,842 US4958840A (en) 1988-05-27 1988-05-27 Self disengaging keyless chuck

Publications (1)

Publication Number Publication Date
WO1989011368A1 true WO1989011368A1 (fr) 1989-11-30

Family

ID=26895208

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1989/001945 WO1989011368A1 (fr) 1988-05-27 1989-05-04 Mandrin sans clavettes

Country Status (3)

Country Link
EP (1) EP0415964A4 (fr)
JP (1) JPH03504943A (fr)
WO (1) WO1989011368A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0933156A2 (fr) * 1998-01-30 1999-08-04 Power Tool Holders Incorporated Mandrin avec arrêt pour les mors
US6007071A (en) * 1998-03-09 1999-12-28 Power Tool Holders Incorporated Chuck with locking body
EP2200772A1 (fr) * 2007-09-06 2010-06-30 Demain Technology PTY Ltd. Ensemble mécanique destiné à une machine-outil
WO2011056560A1 (fr) * 2009-10-26 2011-05-12 Black & Decker Inc. Mécanisme de raccordement d'un porte-outil à un outil électrique
EP1993763A4 (fr) * 2005-04-18 2011-06-15 Black & Decker Inc Mandrin d'outil avec bague de serrage coulissante et mécanisme de mandrin

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684856A (en) * 1950-03-18 1954-07-27 Jacobs Mfg Co Apparatus for tightening chucks of power drills
US4536113A (en) * 1982-03-15 1985-08-20 Hatfield Jim J Automatic jaw control for reversible power tool
US4682918A (en) * 1984-04-16 1987-07-28 Milwaukee Electric Tool Corporation Keyless impacting chuck

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684856A (en) * 1950-03-18 1954-07-27 Jacobs Mfg Co Apparatus for tightening chucks of power drills
US4536113A (en) * 1982-03-15 1985-08-20 Hatfield Jim J Automatic jaw control for reversible power tool
US4682918A (en) * 1984-04-16 1987-07-28 Milwaukee Electric Tool Corporation Keyless impacting chuck

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0415964A4 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0933156A2 (fr) * 1998-01-30 1999-08-04 Power Tool Holders Incorporated Mandrin avec arrêt pour les mors
EP0933156A3 (fr) * 1998-01-30 2002-11-06 Power Tool Holders Incorporated Mandrin avec arrêt pour les mors
US6007071A (en) * 1998-03-09 1999-12-28 Power Tool Holders Incorporated Chuck with locking body
EP1993763A4 (fr) * 2005-04-18 2011-06-15 Black & Decker Inc Mandrin d'outil avec bague de serrage coulissante et mécanisme de mandrin
EP2200772A1 (fr) * 2007-09-06 2010-06-30 Demain Technology PTY Ltd. Ensemble mécanique destiné à une machine-outil
CN101918163A (zh) * 2007-09-06 2010-12-15 迪美科技控股有限公司 电动工具的机械组件
EP2200772A4 (fr) * 2007-09-06 2011-04-27 Demain Technology Pty Ltd Ensemble mécanique destiné à une machine-outil
WO2011056560A1 (fr) * 2009-10-26 2011-05-12 Black & Decker Inc. Mécanisme de raccordement d'un porte-outil à un outil électrique

Also Published As

Publication number Publication date
JPH03504943A (ja) 1991-10-31
EP0415964A4 (en) 1991-04-17
EP0415964A1 (fr) 1991-03-13

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