CN103538033B

CN103538033B - Clamping device

Info

Publication number: CN103538033B
Application number: CN201210236058.7A
Authority: CN
Inventors: 张士松; 钟红风
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2012-07-10
Filing date: 2012-07-10
Publication date: 2015-12-16
Anticipated expiration: 2032-07-10
Also published as: CN103538033A

Abstract

A kind of clamping device, for accommodating and clamping the outside tool heads inserted, comprising: axially extended main shaft, the first end of main shaft arranges six side's shanks; Be arranged at main shaft second end for accommodating the accepting hole of tool heads; Be arranged at the control piece of main shaft actively; Be arranged at the elastic component between control piece and main shaft; Along main shaft diameter to arranging and the accepting groove through with accepting hole; And be arranged at the locking member of accepting groove; Described accepting hole is set to circular port, described control piece operationally controls locking member and moves between primary importance and the second place along accepting groove radial direction, during primary importance, tool heads and principal shaft locking make tool heads transmission from the moment of torsion of main shaft by locking member, latch fitting part releasing tool head during the second place; This clamping device structure is simple, easy to operate.

Description

Clamping device

Technical field

The present invention relates to a kind of annex of hand held electric tool, especially a kind of tool heads clamping device.

Background technology

Many merits drilling tool common in the market has the functions such as brill, screwdriver, impact wrench, before selection difference in functionality carries out work, first will install corresponding function on instrument and the working head of applicable working condition requirement, as drill bit, screwdriver bit, sleeve.Usual multi-functional drill is provided with the chuck with hexagonal hole, for clamping drill bit, screwdriver bit and the sleeve with six side's shanks.But, the circular staight shank that on market, modal drill bit all adopts, if the drill bit of circular staight shank will be installed on this multi-functional drill to carry out boring work, must by means of an adapter, that is be arranged to connect six side's shanks with transmitting torque with the hexagonal hole of chuck with this adapter one end, the other end is arranged to clamp the drill chuck with circular straight shank drill, could be delivered to the drill bit with circular staight shank like this by being provided with the rotary motion that hexagonal hole chuck passes out by adapter.The drill chuck of this adaptor adopts three-jaw drill chuck usually, and the complex structure of three-jaw drill chuck, manufacturing cost is high, and user operates cumbersome when installing drill bit simultaneously, brings inconvenience to client.

Summary of the invention

For overcoming the deficiencies in the prior art, the invention provides the clamping device that a kind of structure is simple, easy to operate.

For achieving the above object, technical scheme of the present invention is: a kind of clamping device, and for accommodating and clamping the outside tool heads inserted, comprising: axially extended main shaft, the first end of main shaft arranges six side's shanks; Be arranged at main shaft second end for accommodating the accepting hole of tool heads; Be arranged at the control piece of main shaft actively; Be arranged at the elastic component between control piece and main shaft; Along main shaft diameter to arranging and the accepting groove through with accepting hole; And be arranged at the locking member of accepting groove; Described accepting hole is set to circular port, described control piece operationally controls locking member and moves between primary importance and the second place along accepting groove radial direction, during primary importance, tool heads and principal shaft locking make tool heads transmission from the moment of torsion of main shaft by locking member, latch fitting part releasing tool head during the second place.

Preferably, accepting hole has the openend for receiving tool head, and the blind hole end that opposing opened ends is arranged.

Preferably, the quantity of accepting groove be two and two accepting grooves along main shaft diameter to being symmetrical arranged, be respectively arranged with locking member in two accepting grooves, described locking member is steel ball.

Preferably, control piece is the annular lock tube being sheathed on main shaft periphery, and described annular lock tube relative main moves axially.

Tool heads arranges the tight lock part engaged with locking member.Preferably, tool heads is spiral bit, and described tight lock part is the chip area of spiral bit.

Another kind is real to be revolved in mode, and main shaft comprises the countersunk drilling being arranged at the second end and exceeding described control piece vertically further.Countersunk drilling comprises the leg arranged around described accepting hole circumference and the cutting edge be arranged on leg.The internal diameter of leg is consistent with accepting hole diameter, and the external diameter of described leg is greater than accepting hole diameter.

Preferably, leg extends the circumference of 3/4ths around accepting hole central axis.Leg is in being circumferentially formed with breach, and the both sides of breach have breach face respectively, and cutting edge lies along on the breach face in main shaft direction of rotation vertically.

Compared with prior art, clamping device of the present invention carries out locking and for the tight lock part of transmitting torque due to the engaging piece arranging the circular staight shank of circular accepting hole and cooperation, therefore clamping device can clamp the tool heads with circular staight shank, clamping device structure is simple, cost is low, and easy to operate.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described:

Fig. 1 is the front view of first embodiment of the invention clamping device.

Fig. 2 be in Fig. 1 clamping device shed tool heads after amplification view.

Fig. 3 is the three-dimensional exploded view of clamping device in Fig. 1.

Fig. 4 is the sectional view by A-A direction in Fig. 1.

Fig. 5 is the sectional view by B-B direction in Fig. 4.

Fig. 6 is the cross-sectional schematic when lock tube of clamping device is in release conditions in Fig. 1.

Fig. 7 is that in Fig. 6, in clamping device, tool heads is in cross-sectional schematic when removing state.

Fig. 8 is the schematic perspective view of second embodiment of the invention clamping device.

Fig. 9 is the three-dimensional exploded view of clamping device in Fig. 8.

Figure 10 is clamping device front view in Fig. 8.

Figure 11 is the sectional view of the main apparent direction of clamping device in Fig. 8.

Wherein:

10,10 '-clamping device 126-first locating part 150-breach

Convex wall 150a-breach face inside 11-main shaft 127-

111-six side shank 128-second locating part 151-cutting edge

112-groove 13-stage clip 16-leg

12-lock tube 130-chip area 16a-Part I

120-opening 131-step 16b-Part II

122-accepting hole 132-arc surface 20-tool heads

122a-blind hole end 134-arc surface 20a-bit head

124-accepting groove 15-countersunk drilling 20b-rounded handle

125-steel ball

Detailed description of the invention

See shown in Fig. 1 to Fig. 3, clamping device 10 comprises axially extended main shaft 11, the control piece 12 that relative main 11 activity is arranged, and is arranged at the elastic component between control piece 12 and main shaft 11.Control piece in the present embodiment is that to be sheathed on main shaft 11 peripheral and can the annular lock tube 12 that slides of relative main 11, and elastic component adopts stage clip 13, and certain elastic component can adopt other elastic device to replace.

With reference to Fig. 2, Fig. 3, main shaft 11 has two ends, and wherein first end is arranged to six side's shanks 111, and namely the cross section of this six sides shank 111 is regular hexagon, six side's shanks 111 are extended with a segment distance vertically, and arrange the radial groove 112 arranged at the suitable position of its bearing of trend.The effect that six side's shanks 111 arrange groove 112 is when clamping device 10 connects with the chuck (not shown) of electric tool, the groove 112 of six side's shanks 111 can engage with the locking piece in chuck thus main shaft 11 is positioned in this chuck, and six side's shanks 111 are then for coordinating with the hexagonal hole (not shown) of the chuck of accommodating this main shaft 11 with transmitting torque.The peripheral surface of the second end of main shaft 11 is arranged to circle and is had the opening 120 received from outside insertion tool head 20, the accepting hole 122 that a segment distance forms collecting tool heads 20 is extended vertically by opening 120, accepting hole 122 is arranged to blind hole end 122a in one end of opposed open 120, accepting hole 122 is circular port, for accommodating the tool heads 20 with rounded handle.On main shaft 11, the position of corresponding lock tube 12 is radially just to being provided with a pair accepting groove 124 (only illustrating in Fig. 3).Accepting groove 124 is through with accepting hole 122 respectively and contain latch fitting part, and the locking member in this example adopts steel ball 125.Lock tube 12 is positioned at the position corresponding with steel ball 125 position.Main shaft 11 is fixedly installed the first locating part 126 and the second locating part 128, first locating part 126 is arranged near opening 120, for carrying out spacing to the slip of lock tube 12 relative main 11, stage clip 13 one end is against the second locating part 128, and the other end is against the inwall of lock tube 12.

With reference to shown in Fig. 4, Fig. 5, tool heads 20 is contained in accepting hole 122, the tool heads 20 of the present embodiment is spiral bit, the end of spiral bit is arranged to rounded handle 20b and extension one segment distance and accepting hole 122 connect, and the bit head 20a of fluted drill has the two symmetrically arranged spirality chip areas 130 in road.When spiral bit is accommodated and is held on this clamping device 10, steel ball 125 is engaged in chip area 130 respectively, now lock tube 12 is held in its locked position under the active force of stage clip 13, abut with steel ball 125 at the inwall 127 of this locked position lock tube 13, that is steel ball 125 does not have movable space in radial direction, thus spiral bit and main shaft 11 are locked be integrated, thus make to rotate with main shaft 11 by spiral bit, clamping device 10 communicates the moment of torsion that exported by electric tool and rotary motion is passed to spiral bit and carries out boring work.Certainly the locking member of this example is not limited to steel ball 125, also can replace with the locking member that other has similar functions and function.

With further reference to Fig. 4, Fig. 6, lock tube 12 is slided along arrow direction indication P in Fig. 6, now stage clip 13 one end is subject to lock tube 12 active force and is compressed, when lock tube 12 slides into off-position, convex wall 127 disengagement in inner side of lock tube 12 and abutting of steel ball 125, that is, steel ball 125 radially has certain activity space in accepting groove 124, now impose on first export-oriented active force transferred to of fluted drill, then steel ball 125 radially outward moves along accepting groove 124 under the effect of rounded handle 20b, when steel ball 125 shifts out accepting hole 120, spiral bit just can be transferred to like a cork from accepting hole 120.

With reference to Fig. 7, when spiral bit is installed on clamping device 10 by needs, first press arrow direction indication P sliding lock set 12 to off-position in Fig. 6, the convex wall 127 in the inner side of lock tube 12 is thrown off and the abutting of steel ball 125, now the rounded handle 20b of spiral bit is inserted accepting hole 122 from opening 120, when steel ball 125 touches rounded handle 20b and is subject to the active force that rounded handle 20b promotes to accepting hole 122, it is outside that steel ball 125 radially outward can move to accepting hole 120 in accepting groove 124, like this, spiral bit just can easily insert in accepting hole 120 until spiral bit rounded handle 20b abuts with blind hole end 122a, then unclamping lock tube 12 makes it reply, and such spiral bit 20 just completes installation.Certainly, spiral bit 20 after installation might not lock onto in clamping device 10, because steel ball 125 likely also not exclusively engages with chip area 130, as long as but startup electric tool switch contacts workpiece with spiral bit 10 while making clamping device 10 drive spiral bit 10 to rotate, spiral bit automatically can turn over an angle thus make steel ball 125 be engaged in chip area 130, and the position of engagement of steel ball 125 with chip area 130 automatically locks by lock tube 12 under the effect of stage clip 13.

With reference to Fig. 8, Fig. 9, the clamping device 10 ' of the second embodiment of the present invention and the clamping device 10 of the first embodiment have similar structures, and therefore identical structure represents with same numbering and do not repeat.The first end of main shaft 11 ' is that six side's shank 111, second ends are provided with countersunk drilling 15, and the object arranging countersunk drilling 15 is that the afterbody further in hole after spiral bit pierces certain depth on workpiece forms counter sink (not shown).Countersunk drilling 15 axially extends beyond lock tube 12 along main shaft 11, countersunk drilling 15 has the leg 16 arranged around accepting hole 120 circumference, internal diameter and accepting hole 120 diameter of leg 16 are basically identical, the external diameter of leg 16 is greater than accepting hole 120 diameter, the external diameter of leg 16 sets according to the size of required counter sink, and the axial extension of leg 16 determines the degree of depth of counter sink simultaneously.

With further reference to Figure 10, Figure 11, the leg 16 of the present embodiment countersunk drilling 15 comprises Part I 16a and Part II 16b, wherein Part I 16a is different with the external diameter of Part II 16b, leg Part I 16a is near accepting groove 124, leg Part II 16b is away from accepting groove 124, leg Part I 16a external diameter is greater than leg Part II 16b external diameter, and leg 16 is forming step 131 near one end of lock tube 13, and this step 131 slides to countersunk drilling 15 further for limiting lock tube 13.Leg Part I 16a and Part II 16b external diameter suddenly change and form joint face, and this joint face is arranged to arc surface 132 and in the circumferential to leg 16 Part I spiral extension.The top of leg Part II 16b is formed equally in the circumferential to the arc surface 134 of leg 16 Part I spiral extension.Arc surface 132 is different from arc surface 134 width, but is parallel to each other in the direction of extension.Leg 16 extends the circumference of 3/4 around accepting hole 120 center, leg 16 is formed with breach 150 on circumference bearing of trend, breach 150 both sides have breach face 150a respectively, on the breach face 150a that the cutting edge 151 of countersunk drilling 15 is disposed therein, this breach face 150a is the windward side in main shaft 11 direction of rotation, and cutting edge 151 axially extends along countersunk drilling 15.Leg 16 and cutting edge 151 are so arranged, and the resistance must holed in its direction of rotation at countersunk drilling 15 is minimum, and drilling efficiency is the highest.

The tool heads of gripping apparatus grips of the present invention is not limited to spiral bit, as long as tool heads one end has rounded handle, and have in rounded handle relevant position with lock compress the tight lock part engaged, just can be suitable for clamping device of the present invention.

Claims

1. a clamping device, for accommodating and clamping the outside tool heads inserted, comprising:

Axially extended main shaft, the first end of main shaft arranges six side's shanks;

Be arranged at main shaft second end for accommodating the accepting hole of tool heads;

Be arranged at the control piece of main shaft actively;

Be arranged at the elastic component between control piece and main shaft;

Along main shaft diameter to arranging and the accepting groove through with accepting hole;

And be arranged at the locking member of accepting groove;

It is characterized in that: described accepting hole is set to circular port, described control piece operationally controls locking member and moves between primary importance and the second place along accepting groove radial direction, during primary importance, tool heads and principal shaft locking make tool heads transmission from the moment of torsion of main shaft by locking member, and during the second place, locking member relieves the locking to tool heads; Described main shaft comprises the countersunk drilling being arranged at the second end and exceeding described control piece vertically further; Described countersunk drilling comprises the leg arranged around described accepting hole circumference and the cutting edge be arranged on leg; Described leg is formed with breach on bearing of trend, and the both sides of breach have breach face respectively, and cutting edge extends vertically and is positioned on the breach face in main shaft direction of rotation.

2. clamping device according to claim 1, is characterized in that: described accepting hole has the openend for receiving tool head, and the blind hole end that opposing opened ends is arranged.

3. clamping device according to claim 1, is characterized in that: the quantity of described accepting groove be two and two accepting grooves along main shaft diameter to being symmetrical arranged, be respectively arranged with locking member in two accepting grooves.

4. clamping device according to claim 3, is characterized in that: described locking member is steel ball.

5. clamping device according to claim 1, is characterized in that: described control piece is the annular lock tube being sheathed on main shaft periphery, and described annular lock tube relative main moves axially.

6. clamping device according to claim 1, is characterized in that: described tool heads has the tight lock part engaged with locking member.

7. clamping device according to claim 6, is characterized in that: described tool heads is spiral bit, and described tight lock part is the chip area of spiral bit.

8. clamping device according to claim 1, is characterized in that: the internal diameter of described leg is consistent with accepting hole diameter, and the external diameter of described leg is greater than accepting hole diameter.

9. clamping device according to claim 1, is characterized in that: described leg is around the circumference of the central axis extension 3/4ths of accepting hole.