GB2031764A - Chuck adaptor - Google Patents

Chuck adaptor Download PDF

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Publication number
GB2031764A
GB2031764A GB7932540A GB7932540A GB2031764A GB 2031764 A GB2031764 A GB 2031764A GB 7932540 A GB7932540 A GB 7932540A GB 7932540 A GB7932540 A GB 7932540A GB 2031764 A GB2031764 A GB 2031764A
Authority
GB
United Kingdom
Prior art keywords
hole
shank
drill
chuck
adaptor
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
GB7932540A
Other versions
GB2031764B (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wild E J
Original Assignee
Wild E J
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
Application filed by Wild E J filed Critical Wild E J
Publication of GB2031764A publication Critical patent/GB2031764A/en
Application granted granted Critical
Publication of GB2031764B publication Critical patent/GB2031764B/en
Expired legal-status Critical Current

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
    • B23B31/107—Retention by laterally-acting detents, e.g. pins, screws, wedges; Retention by loose elements, e.g. balls
    • B23B31/1075—Retention by screws

Abstract

A drill chuck adaptor comprises a shank portion 12 for engagement in a drill chuck and a body portion 10 having a longitudinal blind hole 14 extending into the body portion from the end thereof remote from the shank portion. The hole 14 is coaxial with the shank portion 12 and has a cylindrical outer portion 16 of diameter greater than that of the shank portion 12 and a frusto-conical inner portion 18. Three equiangularly spaced screws 20 extend radially through the wall of the body portion 10 into the outer hole portion 16 to clamp the shank 28 of a drill bit 26 which may be inserted into the hole 14. <IMAGE>

Description

SPECIFICATION Chuck adaptor This invention relates to chuck adaptors and more particularly to adaptors for enabling a drill chuck to drive a rotary tool such as a drill bit of larger diameter than can be accomodated by the chuck.
According to the invention, a drill chuck adaptor comprises a shank portion for engagement in a drill chuck and a body portion having a longitudinal blind hole extending into the body portion from the end thereof remote from the shank portion, the hole being coaxial with the shank portion and having an inner portion which tapers as it extends inwardly and an outer portion of larger crosssection than the shank portion and provided with clamping means for clamping a rotary tool coaxial with the hole.
In use, the shank portion of the adaptor is fitted into the chuck of a drill and a tool is received in the hole in the body portion. It will usually be preferable for the shank portion and the outer portion of the hole to be cylindrical, in which case the inner portion of the hole is frustoconical. However, with some designs of chuck, it is preferable for the shank portion to have a different cross-section, such as a square or triangular cross-section. Similarly, with some types of tool a different crosssection for the hole may be desirable. However, in all cases it is important for the shank portion and hole to be so aligned that the tool is held centrally with respect to the chuck.
An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is an end view of a drill chuck adaptor with a drill bit therein, and Figure 2 is a cross-sectional view taken on the line Il-Il in Figure 1.
The drill chuck adaptor shown in the drawings comprises a cylindrical body portion 10 coaxial with a cylindrical shank portion 12 which has a knurled cylindrical surface to give a good grip in the chuck of a drill. The cylindrical body portion 10 contains a blind hole 14 extending coaxially inwardly from the end face opposite to the shank 12 and having an outer portion 16 with a cylindrical wall and a frustoconical inner portion 18 with a wall which tapers inwardly at an angle of 10' to the cylindrical wall. Three socket-headed grub screws 20, 22 and 24 extend radially inwardly into the outer portion 16 of the hole 14 through respective tapped holes provided in the walls of the body portion 10, disposed at 1 20' to one another around the circumference of the body portion 10.Thus, when a drill bit such as the drill bit 26 is inserted into the adaptor, the inner end of the shank 28 of the drill bit 26 abuts against the tapering surfaces of the frustoconical portion 18 of the hole 14 while the shank 28 is gripped further along by the grub screws 20, 22 and 24. The inner end of the shank 28 is thus automatically centred by the frustoconical portion 18 of the hole 14 while the outer end is centred by suitably adjusting the three grub screws 20, 22 and 24, which can be firmly tightened using a hexagonal bar wrench. The adaptor can thus grip a drill having a shank of any diameter between the diameter of the cylindrical portion 16 of the hole 14 and the diameter of the inner end of the frustoconical portion 18 thereof, only one adaptor being needed for this whole range of sizes.
If desired a greater number of grub screws may be used to clamp the shank 28 in the outer portion 16 of the hole 14. Moreover, alternative fixing means may be used if desired.
The invention can be used with reamers, polishing pads, polishing brushes and like rotary tools as well as with drill bits.
1. A drill chuck adaptor comprising a shank portion for engagemnt in a drill chuck and a body portion having a longitudinal blind hole extending into the body portion from the end thereof remote from the shank portion, the hole being coaxial with the shank portion and having an inner portion which tapers as it extends inwardly and an outer portion of larger cross-section than the shank portion and provided with clamping means for clamping a rotary tool coaxial with the hole.
2. A drill chuck adaptor according to claim 1, wherein the blind hole is of circular crosssection.
3. A drill chuck adaptor according to claim 1 or claim 2, wherein the clamping means comprises a plurality of screws extending radially inwardly into the outer portion of the hole through respective tapped holes provided in the walls of the body portion.
4. A drill chuck adaptor according to claim 3, wherein there are provided three screws equiangularly spaced about the circumference of the body portion.
5. A drill chuck adaptor according to any preceding claim, wherein the shank portion is knurled or otherwise formed to provide good grip in the chuck of a drill.
6. A drill chuck adaptor substantially as described with reference to and as shown in the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (6)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Chuck adaptor This invention relates to chuck adaptors and more particularly to adaptors for enabling a drill chuck to drive a rotary tool such as a drill bit of larger diameter than can be accomodated by the chuck. According to the invention, a drill chuck adaptor comprises a shank portion for engagement in a drill chuck and a body portion having a longitudinal blind hole extending into the body portion from the end thereof remote from the shank portion, the hole being coaxial with the shank portion and having an inner portion which tapers as it extends inwardly and an outer portion of larger crosssection than the shank portion and provided with clamping means for clamping a rotary tool coaxial with the hole. In use, the shank portion of the adaptor is fitted into the chuck of a drill and a tool is received in the hole in the body portion. It will usually be preferable for the shank portion and the outer portion of the hole to be cylindrical, in which case the inner portion of the hole is frustoconical. However, with some designs of chuck, it is preferable for the shank portion to have a different cross-section, such as a square or triangular cross-section. Similarly, with some types of tool a different crosssection for the hole may be desirable. However, in all cases it is important for the shank portion and hole to be so aligned that the tool is held centrally with respect to the chuck. An embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 is an end view of a drill chuck adaptor with a drill bit therein, and Figure 2 is a cross-sectional view taken on the line Il-Il in Figure 1. The drill chuck adaptor shown in the drawings comprises a cylindrical body portion 10 coaxial with a cylindrical shank portion 12 which has a knurled cylindrical surface to give a good grip in the chuck of a drill. The cylindrical body portion 10 contains a blind hole 14 extending coaxially inwardly from the end face opposite to the shank 12 and having an outer portion 16 with a cylindrical wall and a frustoconical inner portion 18 with a wall which tapers inwardly at an angle of 10' to the cylindrical wall. Three socket-headed grub screws 20, 22 and 24 extend radially inwardly into the outer portion 16 of the hole 14 through respective tapped holes provided in the walls of the body portion 10, disposed at 1 20' to one another around the circumference of the body portion 10.Thus, when a drill bit such as the drill bit 26 is inserted into the adaptor, the inner end of the shank 28 of the drill bit 26 abuts against the tapering surfaces of the frustoconical portion 18 of the hole 14 while the shank 28 is gripped further along by the grub screws 20, 22 and 24. The inner end of the shank 28 is thus automatically centred by the frustoconical portion 18 of the hole 14 while the outer end is centred by suitably adjusting the three grub screws 20, 22 and 24, which can be firmly tightened using a hexagonal bar wrench. The adaptor can thus grip a drill having a shank of any diameter between the diameter of the cylindrical portion 16 of the hole 14 and the diameter of the inner end of the frustoconical portion 18 thereof, only one adaptor being needed for this whole range of sizes. If desired a greater number of grub screws may be used to clamp the shank 28 in the outer portion 16 of the hole 14. Moreover, alternative fixing means may be used if desired. The invention can be used with reamers, polishing pads, polishing brushes and like rotary tools as well as with drill bits. CLAIMS
1. A drill chuck adaptor comprising a shank portion for engagemnt in a drill chuck and a body portion having a longitudinal blind hole extending into the body portion from the end thereof remote from the shank portion, the hole being coaxial with the shank portion and having an inner portion which tapers as it extends inwardly and an outer portion of larger cross-section than the shank portion and provided with clamping means for clamping a rotary tool coaxial with the hole.
2. A drill chuck adaptor according to claim 1, wherein the blind hole is of circular crosssection.
3. A drill chuck adaptor according to claim
1 or claim 2, wherein the clamping means comprises a plurality of screws extending radially inwardly into the outer portion of the hole through respective tapped holes provided in the walls of the body portion.
4. A drill chuck adaptor according to claim 3, wherein there are provided three screws equiangularly spaced about the circumference of the body portion.
5. A drill chuck adaptor according to any preceding claim, wherein the shank portion is knurled or otherwise formed to provide good grip in the chuck of a drill.
6. A drill chuck adaptor substantially as described with reference to and as shown in the accompanying drawings.
GB7932540A 1978-09-19 1979-09-19 Chuck adaptor Expired GB2031764B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7837281 1978-09-19

Publications (2)

Publication Number Publication Date
GB2031764A true GB2031764A (en) 1980-04-30
GB2031764B GB2031764B (en) 1982-08-25

Family

ID=10499757

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7932540A Expired GB2031764B (en) 1978-09-19 1979-09-19 Chuck adaptor

Country Status (1)

Country Link
GB (1) GB2031764B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156248A (en) * 1984-02-24 1985-10-09 Kaiser Ag Heinz Device for connecting a tool part to a connecting shaft
US4930947A (en) * 1989-05-30 1990-06-05 M.L.S. Detroit, Inc. Tool holder
US5405221A (en) * 1992-12-30 1995-04-11 Ducker, Iii; Andrew L. Gyro-stabilized tool bit with wide, removable mounting adaptor for use in a wide mouth chuck
US6264408B1 (en) * 2000-02-17 2001-07-24 Hui Ping Lung Pneumatic tool kit
FR2941161A1 (en) * 2009-01-22 2010-07-23 Univ Grenoble 1 Machining assembly for rotating machine such as drilling machine, has clamping unit supported against bottom of flat part of tool, and support zones stopped against each other when tool is displaced towards back with respect to tool holder

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156248A (en) * 1984-02-24 1985-10-09 Kaiser Ag Heinz Device for connecting a tool part to a connecting shaft
US4930947A (en) * 1989-05-30 1990-06-05 M.L.S. Detroit, Inc. Tool holder
US5405221A (en) * 1992-12-30 1995-04-11 Ducker, Iii; Andrew L. Gyro-stabilized tool bit with wide, removable mounting adaptor for use in a wide mouth chuck
US6264408B1 (en) * 2000-02-17 2001-07-24 Hui Ping Lung Pneumatic tool kit
FR2941161A1 (en) * 2009-01-22 2010-07-23 Univ Grenoble 1 Machining assembly for rotating machine such as drilling machine, has clamping unit supported against bottom of flat part of tool, and support zones stopped against each other when tool is displaced towards back with respect to tool holder

Also Published As

Publication number Publication date
GB2031764B (en) 1982-08-25

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PCNP Patent ceased through non-payment of renewal fee