Quick-change drill chuck

• US 6,648,563 B2
• Filed: 12/14/2001
• Issued: 11/18/2003
• Est. Priority Date: 10/23/2001
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Röhm, Günter Horst
• Primary Examiner(s): Bishop, Steven C.
• Application Number:
  US10/016,888
• Publication Number:
  US 20030077136A1
• Time in Patent Office: 704 Days
• Field of Search: 408/239.R, 408/239.A, 408/240, 279/22, 279/29, 279/30, 279/74, 279/75, 279/60-65, 279/904, 279/905, 279/143-145, 279/155
• US Class Current: 408/239.00R
• CPC Class Codes: B23B 31/1071 Retention by balls balls acting as jaws B23B31/22
• CPC Class Codes: B23B 31/1238 Jaws movement actuated by a nut with conical screw-thread
• CPC Class Codes: B23Q 3/12 for securing to a spindle in general B23Q3/152 takes precedence; chucks B23B31/02
• CPC Class Codes: Y10T 279/17632 Conical sleeve
• CPC Class Codes: Y10T 279/17752 Ball or roller jaws
• CPC Class Codes: Y10T 279/3418 for particular tool or workpiece
• CPC Class Codes: Y10T 408/95 with tool-retaining means

Abstract

A drive spindle is formed with an axially forwardly open socket of noncircular section and with at least one radially throughgoing passage open radially inward into the socket. A chuck body has a stem of noncircular section complementary to that of the socket and formed with a radially outwardly open recess. A locking element is radially displaceable in the passage between an inner position projecting radially inward into the socket and an outer position clear of the socket and projecting radially outward from the spindle. The stem is fittable to the socket with its recess aligned with the passage. A collar is formed with an inner surface closely juxtaposed with an outside surface of the spindle and with a radially inwardly open recess.

Claims

1. A drill comprising:

a drive spindle centered on and rotatable about a spindle axis and formed centered on the spindle axis with

an axially forwardly open socket of noncircular section,

at least one radially throughgoing passage open radially inward into the socket,

a radially directed rotation-symmetrical surface portion, and

an axially directed planar face perpendicular to the spindle axis;

a chuck body formed with a radially directed rotation-symmetrical surface portion complementary to the radially directed surface portion of the spindle and with an axially directed planar face perpendicular to a stem axis;

a stem of noncircular section complementary to that of the socket, fixed to the chuck body, extending along the stem axis from the chuck body, and formed with a radially outwardly open recess, the stem being fittable in the socket with the radially directed surface portions snugly radially engaging each other and the faces bearing axially flatly on each other;

a locking element radially displaceable in the passage between an inner position projecting radially inward into the socket and an outer position clear of the socket and projecting radially outward from the spindle, the recess being aligned with the passage when the stem is fitted to the socket with the faces bearing axially on each other; and

a collar formed with an inner surface closely juxtaposed with an outside surface of the spindle and with a radially inwardly open recess, the collar being axially displaceable on the spindle between a locked position with its inner surface pressing the element into the inner position and an unlocked position with its recess level with the element and the element movable into the outer position engaged in the collar recess.

2. The drill defined in claim 1 wherein the chuck-body surface portion is a cylindrical inner surface centered on the stem axis and the spindle surface portion is a cylindrical outer surface centered on the spindle axis.

3. The drill defined in claim 1 wherein the socket surface portion is a cylindrical inner surface centered on the spindle axis and the stem surface portion is a cylindrical outer surface centered on the stem axis.

4. The drill defined in claim 1 wherein the spindle has an outer end formed with the respective planar face.

5. The drill defined in claim 1 wherein the stem has an outer end formed with the respective planar face and the socket has a floor formed with the planar face of the spindle.

6. The drill defined in claim 1 wherein the stem and socket are of polygonal section.

7. The drill defined in claim 1 wherein the spindle is formed with a plurality of the passages each receiving a respective one of the locking elements, the recess of the stem being a radially outwardly open groove.

8. The drill defined in claim 7 wherein the locking elements are balls.

9. The drill defined in claim 1, further comprising

a spring braced between the spindle and the collar urging the collar into the locked position.

10. The drill defined in claim 1 wherein the body is formed with a plurality of angled axially forwardly open guides, the drill further comprising:

respective jaws displaceable in the jaws; and

a tightening ring rotatable on the body and having a screwthread meshing with the jaws.

11. The drill defined in claim 1, further comprising:

a knockout rod axially displaceable in the spindle and axially engageable with the stem; and

a spring urging the knockout rod outward against the stem.

12. The drill defined in claim 11, further comprising:

a second locking element radially engageable with the knockout rod and with the collar, the second locking element being movable out of engagement with the knockout rod on displacement of the collar into the unlocked position.

13. The drill defined in claim 12 wherein the spindle is formed with a second radially extending passage level with the knockout rod and holding the second locking element, the knockout rod being formed with a radially outwardly open recess in which the second element is radially engageable in the locked position of the collar.

14. The drill defined in claim 1 wherein the spindle has an outer part forming the socket and an inner part, the outer and inner parts being threaded together.

15. A drill comprising:

a drive spindle centered on and rotatable about a spindle axis and formed centered on the spindle axis with an axially forwardly open socket of noncircular section and with at least one radially throughgoing passage open radially inward into the socket;

a chuck body;

a stem of noncircular section complementary to that of the socket, fixed to the chuck body, and extending along a stem axis from the chuck body, the stem being formed with a radially outwardly open recess;

a locking element radially displaceable in the passage between an inner position projecting radially inward into the socket and an outer position clear of the socket and projecting radially outward from the spindle, the stem being fittable to the socket with its recess aligned with the passage;

a collar formed with an inner surface closely juxtaposed with an outside surface of the spindle and with a radially inwardly open recess, the collar being axially displaceable on the spindle between a locked position with its inner surface pressing the element into the inner position and an unlocked position with its recess level with the element and the element movable into the outer position engaged in the collar recess;

a sleeve axially displaceable on the chuck body and axially engageable with the collar; and

a spring braced between the sleeve and the chuck body and urging the sleeve axially away from the collar.