GB2137122A - Exchange chuck for exchangeably mounting a change shaft for mounting a tool such as drill - Google Patents
Exchange chuck for exchangeably mounting a change shaft for mounting a tool such as drill Download PDFInfo
- Publication number
- GB2137122A GB2137122A GB08307039A GB8307039A GB2137122A GB 2137122 A GB2137122 A GB 2137122A GB 08307039 A GB08307039 A GB 08307039A GB 8307039 A GB8307039 A GB 8307039A GB 2137122 A GB2137122 A GB 2137122A
- Authority
- GB
- United Kingdom
- Prior art keywords
- balls
- bore
- tubular portion
- change shaft
- mounting
- 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
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
- B23B31/1071—Retention by balls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gripping On Spindles (AREA)
Abstract
The shank portion (24) of a shaft (23) is inserted to and fastened in a mounting bore (3) in a tubular portion (2) of the spindle (1) of the chuck. A longitudinally movable sleeve (11) is received on the tubular portion (2), and balls (10) provided in the tubular portion (2) intrude into or recede from the bore (3) depending on the position of the sleeve (1), the balls (10) engaging with and preventing extraction of the change shaft shank portion (24) when intruded into the bore (3). A member (17) in the bottom region of the bore (3) is biased forwardly at all times by a coil spring (19) to eject the change shaft (23) forwardly at the time of an exchange operation. The forward outer periphery of the member (17) is formed with an annular groove (21) defining to an engagement stop (22) operating to engage with the radially inner surface of the balls (10) to prevent accidental extraction of the member (17). <IMAGE>
Description
SPECIFICATION
Exchange chuck for exchangeably mounting a change shaft for mounting a tool such as drill
This invention relates to an exchange chuck for exchangeably mounting a change shaft adapted to mount a tool such as drill used for mounting or dismounting a tool such as drill or tap relative to a spindle.
The invention provides an exchange chuck comprising:
a spindle having a forwardly extending tubular portion with a mounting bore in which a rearwardly extending shank portion of a change shaft adapted for mounting a tool such as drill may be exchangeably introduced, the tubular portion having connecting means operable upon insertion of the shank portion into the mounting bore to cause rotation of the change shaft in unison with the spindle; a longitudinally movable sleeve received on the tubular portion;
a plurality of balls mounted in the tubular portion and being movable to intrude into or recede out of the mounting bore, the balls being operative when intruded into the mounting bore to engage with an extraction inhibiting groove in the rearward end part of the change shaft to inhibit extraction of the change shaft::
an annular groove formed in the inner periphery of the movable sleeve and adapted through longitudinal movement of the sleeve to cause the balls to intrude into the bore or to allow them to recede out of the bore;
an extruder member received in the bottom end part of the mounting bore and having a head for extruding the change shaft at the time of an exchange operation;
a compression spring interposed between the head of the extruder member and the bottom of the bore for perpetually biasing the.extruder member in the forward direction; and
an annular groove formed in the forward outer periphery of the extruder member, an engaging step being formed at the rear end of the annular groove for engaging with radially inner surface portions of the balls for inhibiting extraction of the extruder member in the forward direction.
A drill or tap may be mounted and dismounted relative to the spindle by a one-touch manual operation along with the change shaft.
The extruder member may be halted in its forward movement without the necessity of providing special regulating devices. The extruder member may be moved smoothly within the tubular portion of the spindle.
The invention will be described further, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a sectional view showing an exchange chuck with an exchange shaft annexed thereto;
Figure 2 is a fragmentary perspective view showing the state of engagement between the change shaft and the tubular portion of the exchange chuck;
Figure 3 is a transverse sectional view of the exchange chuck through the balls;
Figure 4 is a sectional view showing the exchange chuck with the exchange shaft being removed; and
Figures 5 and 6 are sectional views showing modified embodiments of the exchange chuck.
Referring to a preferred embodiment shown in
Figures 1 to 4, there is shown a spindle 1 having a tubular portion 2 with a mounting bore 3. A shank portion 24 of a change shaft 23 is introduced into and secured in this mounting bore 3. The inner end periphery of the bore 3 is formed with a relief groove 4 communicating with an air port 5 opening in the outer periphery of the tubular portion 2. The inner bottom surface of the bore 3 is formed with a spring retaining slot 6 having a lesser diameter than the bore diameter.
The foremost part of the tubular portion 2 (the right-hand part in Figure 1) is formed with an enlarged diameter portion 7 and the foremost end face of the portion 2 has a pair of rotation inhibit projections 8. through-holes 9 are formed through the wall of the tubular portion 2 at the longitudinal middle of the portion 2 and balls 10 are accommodated in respective ones of the throughholes 9 so as to be movable towards the inside or outside of the tubular portion 2.
A sleeve 11 is mounted on the tubular portion 2 for sliding longitudinally thereof and an annular recess 12 is defined on the inner periphery of the foremost portion of the sleeve 1 1. The enlarged diameter portion 7 at the foremost part of the tubular portion 2 is received into this recess 12. A coil spring 13 is mounted between the rearmost end of the recess 12 and the enlarged diameter portion 7 of the tubular portion 2 for perpetually biasing the sleeve 1 1 towards rear (left-hand side when viewed in Figure 1).
An undercut annular groove 14 is formed on the rear inner periphery of the movable sleeve 11 at a position corresponding to the balls 10 on the tubular portion 2. The groove 14 consists of a straight portion 15 into which the balls 10 may be intruded out of the mounting bore 3 in the tubular portion 2, and an inclined portion 16 forwardly contiguous to the straight portion 15 and by which the balls 10 may be protruded into the mounting bore 3. The inclined portion 16 has a diameter reduced progressively towards the front (towards the right in Figure 1).
Thus, in the state shown in Figure 1, the balls 3 are biased into the bore 3 by operation of the inclined portion 16 of the annular groove 14.
When the sleeve 11 is slid forwardly against resiliency of the coil spring 13 as shown in Figure 4, the straight portion 1 5 of the groove 14 registers with balls 10, so that the balls 10 can recede out of the bore 3. The balls 10 are of a size such that they may recede completely out of the mounting bore 3. However, unless pushed from the inside of the bore 3, the balls 10 will remain partially projected into the bore 3.
A stop ring 1 a is fitted on the spindle 1 behind the sleeve 1 1 and used as stopper for the limiting rearward stroke of the sleeve 11.
An extruder member 17 in the form of a roofed cylinder is disposed for longitudinal movement in the rearmost or bottom portion of the mounting bore 3 of the tubular portion 2. During movement of the extruder member 1 7, air may flow into and out of the bore 3 through the air port 5 at the rear of the tubular portion 2. A coil spring 19 is mounted between the head 1 8 of the extruder member 17 and the bottom of the slot 6 for biasing the member 17 forwardly. The head 18 of the extruder member 17 has a threaded aperture or hole 20. An annular slot 21 defining a rear engaging step 22 is formed at the forward outer periphery of the extruder member 17.
In Figure 1, when the balls 10 recede outwardly and the extruder member 17 has been shifted forwardly within the mounting bore 3, such movement of the extruder member 1 7 is stopped when the step 22 is engaged with the radially inner surfaces of the balls 10. In the thus halted position of the extruder member 1 7, since the coil spring 19 has been extended to its limit length, the extruder member 17 is not capable of forcibly pushing aside the balls 10 and advancing further forwardly.
The change shaft 23 may be mounted interchangeably in the mounting bore 3 of the tubular portion 2 of the spindle 1. The change shaft 23 is formed by a shank portion 24 inserted into the bore 3, and a tubular mounting portion 25 integrally formed with the forward end of the shank portion 24.
The base end of the shank portion 24 is formed with a pair of rotation inhibit recesses 26 for engaging with the rotation inhibit projections 8 at the foremost part of the tubular portion 2. When the projections 8 are engaged in the recesses 26, the change shaft 23 is locked in rotation relative to the spindle 1. The leading end of the shank portion 24 of the change shaft 23 is formed with an extraction inhibiting peripheral groove 27 formed by an inclined surface 28 to be engaged with the balls 10.
With the balls 10 engaged with inclined surface 28 of the groove 27, it is no longer possible to extract the change shaft 23 out of the spindle 1.
A collet chuck 29 for holding a drill or tap is mounted on the foremost part of the change shaft 23.
When using the aforementioned change chuck, the movable sleeve 11 is slid forwardly as shown in Figure 4. The balls 10 may now recede into the straight portion 15 of the annular groove 14 of the moveable sleeve 11. Thus the shank portion 24 of the change shaft 23 is pushed or extended forwardly by the extruder member 17 as shown by double-dotted chain line in Figure 4. When extruded in this manner, the shaft 23 can be removed from the spindle 1 easily by manual operation. After such removal, the sleeve 11 is returned to its original position by the biasing force of the coil spring 1 3.
When mounting another change shaft to the spindle 1, with the sleeve 11 slid forwardly, the shank portion of the change shaft is introduced from the front side into the tubular portion 2 of the spindle 1.
The extruder member 17 in the tubular portion 2 is now engaged by the change shaft and pushed towards rear against the resiliency of the coil spring 19. The projections 8 at the foremost part of the tubular portion 2 are engaged with the recesses on the change shaft, at the same time that the extraction inhibiting peripheral groove 27 at the leading end of the shaft registers with the balls 10 on the tubular portion 2. In this state, the movable sleeve 11 is freed of forward pressure.
The sleeve 11 may thus be moved towards rear and the balls 10 are forced into the mounting bore 3 of the tubular portion 2 by the biasing force exerted by the inclined portion 1 6 of the annular groove 14. Thus the balls 10 are engaged with the inclined surface 28 of the extraction inhibiting groove 27, thus locking the change shaft to the spindle 1.
In this state, the inner end of the shank portion 24 abuts on the forward end face of the extruder member 17, while the rear end face of the latter abuts on the bottom end of the mounting bore 3.
If the air port 5 of the tubular member 2 becomes stopped up or dust and dirt have intruded into the space between the inner peripheral surface of the mounting bore 3 and the outer peripheral surface of the extruder member 1 7 to obstruct smooth movement of the extruder member 1 7, the latter is taken out of the tubular portion 2 for cleaning its peripheral surface, the air port 5, and the mounting bore 3. When removing the extruder member 17, with the change shaft 23 extracted out of the spindle 1, a bar with a threaded end is introduced into the tubular portion 2 so that the threaded end portion is engaged with the threaded hole 20 of the extruder member 17.
The latter is then removed out of the tubular portion 2 along with the threaded bar. When removing the extruder member 17, since the step 22 is engaged lightly with the balls 10, the member 1 7 is pulled forcibly for retreating the balls 10 radially or sideways out of the mounting bore 3.
When the member 17 has been extracted from the mounting bore 3, the balls 10 are no longer retained by the member 1 7, while the sleeve 11 is also no longer retained by the balls 10. Thus the sleeve 11 is slid towards rear under the force of the coil spring 13. This sliding motion is limited by the stop ring 1 a mounted back of the movable sleeve 11.
From the foregoing it is seen that the annular groove 21 is provided to the foremost outer periphery of the extruder member 17 and the engaging step 22 is provided to the rear end of the groove 21, so that the forward movement of the extruder member 17 during exchange operation of the change shaft 23 may be braked positively by the balls 10 engaging with the step 22 on the extruder member 17. Hence, any separate regulating device for the extruder member 17 may be dispensed with.
Figure 5 shows a modified embodiment of the exchange chuck. In this modification, an annular spring seat 30 is mounted on the foremost part of the tubular member 2 in place of the enlarged diameter portion 7 of the preceding embodiment.
The spring seat 30 is held on the tubular portion 2 by a snap ring 31. In the present modification, an enlarged diameter portion 32 is formed in place of the stop ring 1 a provided on the rear end of the tubular portion 2.
In a further modification of the exchange chuck shown in Figure 6, a snap ring 31 to be used simultaneously as a spring seat is provided on the forward peripheral surface of the tubular portion 2.
The annular groove 14 of the sleeve 11 is extended rearwards to the rear extremity of the sleeve 11. The enlarged diameter portion 32 formed on the spindle 1 is extended forwardly and received in the rear portion of the annular groove 1 4 of the movable sleeve 11.
In addition, in the present modification, a rotation inhibiting hexagonal opening 33 is provided to the forward end of the tubular portion 2 in place of the projections 8 of the tubular portion 2. And in place of the recesses 26 at the base end of the shank portion 24, a rotation inhibiting projection 34 in the form of a hexagonal nut is also provided to the base end of the shank portion 24 so as to be received unrotatably with the rotation inhibiting hexagonal opening 33. The forward end face of the tubular portion 2 abuts on the rear end face of the mounting portion 25 and the thurst force acting on the shaft 23 towards left in Figure 6 during punching may be sustained by such abutment. Hence, in the present embodiment, the rear end of the extruder member 1 7 is not abutted on the bottom end face of the mountinq bore 3.
It may be seen that the extruder member operating during exchange operatiqn of the change shaft to extrude the change shaft forwardly may be regulated positively in its forward extruding movement simply by the peripheral groove provided on the extruder member and thus without resorting to any specialized devices.
Claims (11)
1. An exchange chuck comprising:
a spindle having a forwardly extending tubular portion with a mounting bore in which a rearwardly extending shank portion of a change shaft adapted for mounting a tool such as drill may be exchangeably introduced, the tubular portion having connecting means operable upon insertion of the shank portion into the mounting bore to cause rotation of the change shaft in unison with the spindle; a longitudinal movable sleeve received on the tubular portion;
a plurality of balls mounted in the tubular portion and being movable to intrude into or recede out of the mounting bore, the balls being operative when intruded into the mounting bore to engage with an extraction inhibiting groove in the rearward end part of the change shaft to inhibit extraction of the change shaft;
an annular groove formed in the inner periphery of the movable sleeve and adapted through longitudinal movement of the sleeve to cause the balls to intrude into the bore or to allow them to recede out of the bore;
an extruder member received in the bottom end part of the mounting bore and having a head for extruding the change shaft at the time of an exchange operation;;
a compression spring interposed between the head of the extruder member and the bottom of the bore for perpetually biasing the extruder member in the forward direction; and
an annular groove formed in the forward outer periphery of the extruder member, an engaging step being formed at the rear end of the annular groove for engaging with radially inner surface portions of the balls for inhibiting extraction of the extruder member in the forward direction.
Z. An exchange chuck as claimed in claim 1, in which a coil spring is mounted between the movable sleeve and the tubular portion for perpetually biasing the sleeve rearwards, and the annual groove in the sleeve comprises a straight portion designed to allow the balls to recede outwardly away from the mounting bore and an inclined portion forwardly contiguous to the straight portion and adapted to cause the balls to intrude into the bore, the inclined portion being progressively reduced in inner diameter in the forward direction.
3. An exchange chuck as claimed in claim 1 or 2, air passage means are provided at or near the rear end of the tubular portion to permit air passage therethrough at the time of forward or rearward movement of the extruder member.
4. An exchange chuck as claimed in any preceding claim, in which a threaded hole is provided in the head of the extruder member for engagement with a threaded bar.
5. An exchange chuck as claimed in any preceding claim, including a stop ring mounted on the spindle behind the movable sleeve, for limiting rearward movement of the movable sleeve.
6. An exchange chuck as claimed in any preceding claim, in which the connecting means comprises rotation inhibiting projections formed on the forward end of the tubular portion for engagement with rotation inhibiting recesses formed in the shank portion of the change shaft.
7. An exchange chuck as claimed in any of claims 1 to 6, in which the connecting means coniprises a hexagonal rotation inhibiting opening provided in the forward end of the tubular portion for receiving a rotation inhibiting hexagonal projection on the shank portion of the change shaft.
8. An exchange chuck as claimed in any preceding claim, in which the extruder member is in the form of a hollow cylinder.
9. An exchange chuck as claimed in any preceding claim, in combination with a change shaft adapted for mounting a tool, the shaft having a rearwardly extending shaft portion whose rearward end part has an extraction inhibition groove with which the balls engage.
10. An exchange chuck as claimed in claim 9, in which the extraction inhibiting groove has a rearward inclined surface.
11. An exchange chuck substantially as described with reference to, and as shown in,
Figures 1 to 4, or Figure 5, or Figure 6 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08307039A GB2137122B (en) | 1983-03-15 | 1983-03-15 | Exchange chuck for exchangeably mounting a change shaft for mounting a tool such as drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08307039A GB2137122B (en) | 1983-03-15 | 1983-03-15 | Exchange chuck for exchangeably mounting a change shaft for mounting a tool such as drill |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8307039D0 GB8307039D0 (en) | 1983-04-20 |
| GB2137122A true GB2137122A (en) | 1984-10-03 |
| GB2137122B GB2137122B (en) | 1986-05-29 |
Family
ID=10539569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08307039A Expired GB2137122B (en) | 1983-03-15 | 1983-03-15 | Exchange chuck for exchangeably mounting a change shaft for mounting a tool such as drill |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2137122B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3723736A1 (en) * | 1987-07-17 | 1989-01-26 | Vmei Varna | Cartridge chamber |
| US5199508A (en) * | 1991-08-01 | 1993-04-06 | Kabushiki Kaisha Miyanaga | Rotary hammer drill |
| US6082516A (en) * | 1998-01-22 | 2000-07-04 | Amada Engineering & Service Co., Inc. | Variable height adjustable punch assembly having quick release stripper plate |
| WO2003006194A1 (en) * | 2001-07-09 | 2003-01-23 | Walter Kieninger Gmbh | Device for receiving a tool and tool holding fixture |
-
1983
- 1983-03-15 GB GB08307039A patent/GB2137122B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3723736A1 (en) * | 1987-07-17 | 1989-01-26 | Vmei Varna | Cartridge chamber |
| US5199508A (en) * | 1991-08-01 | 1993-04-06 | Kabushiki Kaisha Miyanaga | Rotary hammer drill |
| US6082516A (en) * | 1998-01-22 | 2000-07-04 | Amada Engineering & Service Co., Inc. | Variable height adjustable punch assembly having quick release stripper plate |
| WO2003006194A1 (en) * | 2001-07-09 | 2003-01-23 | Walter Kieninger Gmbh | Device for receiving a tool and tool holding fixture |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8307039D0 (en) | 1983-04-20 |
| GB2137122B (en) | 1986-05-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940315 |