CN201211675Y

CN201211675Y - Lever type chief axis locking mechanism

Info

Publication number: CN201211675Y
Application number: CNU2008201248841U
Authority: CN
Inventors: 邱蓉静
Original assignee: TOP GEARBOX INDUSTRY Co Ltd
Current assignee: Trinity Precision Tech Co Ltd
Priority date: 2008-07-03
Filing date: 2008-07-03
Publication date: 2009-03-25
Anticipated expiration: 2018-07-03

Abstract

The utility model provides a lever type main shaft locking mechanism which comprises a fixing ring, a main shaft and at least two stators, wherein the main shaft penetrates in the round inside diameter of the fixing ring, the stators are arranged between the main shaft and the inside diameter of the fixing ring, each stator is provided with a first projecting part at the center of the first side and a second projecting part and a third projecting part which are arranged at the corresponding ends of the second side, the first projecting part is contacted with the main shaft, the second and the third projecting parts face to the inside diameter wall face of the fixing ring, when the main shaft bears the external force to rotate clockwise, the stators can be pushed outwards to enable the second projecting part to butt against the fixing ring to generate counterforce, further to enable the other ends of the stators to butt against the fixing ring when the main shaft is rotated by utilizing the seesaw principle, and the main shaft is locked and cannot rotate in the state of stressing evenly.

Description

The lever spindle locking mechanism

Technical field

The utility model relates to a kind of spindle locking mechanism that is used in electric tool, particularly can drive shaft rotate when power is provided, and when stopping power, then can't make the lever spindle locking mechanism of this main axis rotation with external force.

Background technology

The electric tool of existing electric drill is by driven by power, and include plug-in, rechargeable or fill, design such as plug-in dual-purpose type; Electric drill not only can be used for clamping drilling bit with boring, more can the clamping screwdriver heads with the loading and unloading screw.In the workplace of conveniently finding socket, plug-in electric drill can provide stronger driving force certainly, but for not being provided with socket, or socket is far away and make the electric wire of curtailment can not plug-in the time from the work subject matter, and then rechargeable electric drill just can provide preferably and select.Rechargeable electric drill can't drive drill bit or screwdriver rotation because of power shortage sometimes, but the use of can't charging immediately; And plug-in electric drill also can run into unexpected power failure and the puzzlement that can't use, thereby electric drill need be served as hand drill and use.

Early stage existing electric drill structure is owing to be that the driving gear that will be incorporated into motor drive shaft directly is engaged in gear train, be engaged in the driven gear that is combined in central shaft by gear train again and drive, so electric drill served as that hand drill uses during application of force rotation, driven gear will be turned from a guest into a host and be become driving gear, drive to the driving gear rotation that is incorporated into motor drive shaft via gear train again, thereby the phenomenon that causes drill bit or screwdriver heads to dally in the original place, also be that it in fact also can't do the hand drill use.

And, but traditionally as the electric tool of clamping device heads such as electric drill, its clamping device of being located at front end is incorporated into main shaft, and this clamping device include a plurality of jaws and with a knob of the concentric setting of main shaft, can control when rotating this knob this jaw synchronously towards center position by moving the clamping device head, or remove to loosen tool heads toward radiation direction synchronously; But because this clamping device is located at main shaft,, rotate this knob with the another hand again, just must both hands use together can operate smoothly, cause the inconvenience in the use so when rotating knob, must hold the fixedly head that is combined in this main shaft with one.

Taiwan is announced No. 410714 and bulletin all is to solve the existing problem of aforementioned electric tool No. 334869, but tradition has the structure of spindle lock function, mainly be that main shaft and a plurality of roller or steel ball are set in the internal diameter of a retainer ring, when main shaft is rotated, main shaft is driven roller or steel ball conflict retainer ring and is locked, but owing to can not guarantee the absolutely problem of concentricity between main shaft and the retainer ring, can't allow all rollers or steel ball average force really, thereby cause locking effect to be had a greatly reduced quality.

The utility model content

The purpose of this utility model provides a kind of lever spindle locking mechanism, be that the spindle locking mechanism that solves existing electric tool utilizes roller or steel ball as the lock port assembly, being subjected to concentricity can not influence fully accurately, can't allow all rollers or steel ball average force really, the problem that causes locking effect to be not so good as to expect.

Feature of the present utility model, be that main shaft and a plurality of stopper are set in a retainer ring, this stopper is a kind of assembly with seesaw function, in order to replace the roller or the steel ball of existing lock spindle device, when rotating as driving component, main shaft can drive the sub-deflection of this stopper, make an end of stopper be subjected to the reaction force of retainer ring and the sub-other end of stopper is resisted in retainer ring generation locking action, allow the sub-average force of each stopper ground lock, can not be subjected to the influence of retainer ring and main shaft concentricity deficiency.

Based on this, technological means of the present utility model, be in the mechanism of electric tool, to be provided with to comprise a retainer ring, one main shaft and at least two stopper, described main shaft is arranged in the circular inner diameter of this retainer ring, this stopper then is located between the internal diameter and main shaft of this retainer ring, described stopper has first teat that is positioned at the first side central authorities, and second teat and the 3rd teat that are positioned at the second side opposite end, described first teat is contacted with main shaft, and second teat and the 3rd teat are all towards the internal diameter wall of retainer ring, can be when main shaft is subjected to external force effect (as turning clockwise) with stopper toward extrapolation, make described second teat elder generation's conflict retainer ring and produce a reaction force, and then when utilizing the seesaw principle to cause main shaft to rotate again, with the other end conflict retainer ring of moving, thereby can under the state of average force, allow main shaft formation locking rotate.

Compare with the mechanism design of existing like product, the utility model can not influence the average force locking effect of main shaft because of the problem of concentricity, so the utility model possesses the design of progressive, and not seeing has identical or approximate product openly formerly, therefore, the utlity model has novelty and meet the requirement of Patent Law.

Description of drawings

Fig. 1 is located at the embodiment section plan of electric tool inside for the utility model spindle locking mechanism;

Fig. 2 is the section plan along the A-A secant of Fig. 1;

Fig. 3 A is the section plan along the B-B secant of Fig. 1;

When Fig. 3 B turned clockwise for showing that main shaft is past, second teat of stopper produced the schematic diagram of an active force to the retainer ring internal diameter;

Fig. 3 C is the state along continuous Fig. 3 B, and after retainer ring produced a reaction force to second teat of stopper, stopper was fulcrum deflection with one second teat, makes the 3rd teat of stopper produce the schematic diagram of an active force to retainer ring;

Fig. 3 D is the state along continuous Fig. 3 C, when second teat all produces active force to retainer ring with the 3rd teat, can average force ground to the schematic diagram of retainer ring generation self-locking action.

The primary clustering symbol description

1 main shaft

2 retainer rings

3 stopper

31 first teats

32 second teats

33 the 3rd teats

34 pivots

4 planetary gearsets

41 tip axles

5 driving-discs

50 centre bores

51 recesses

52 fan-shaped bumps

6 housings

The specific embodiment

Following conjunction with figs. and element numbers are done more detailed description to embodiment of the present utility model, and the person of ordinary skill in the field can be implemented after studying this specification carefully according to this.

As depicted in figs. 1 and 2, the lever spindle locking mechanism that the utility model provides, include one and be combined in the main shaft 1 of electric tool housing 6 inside by bearing, this main shaft 1 can be rotated freely, and it is outer and can cooperate erecting tools head (for example drill bit, screwdriver first-class) that the front end of this main shaft 1 extends housing; And be provided with a retainer ring 2 and at least two stopper 3 in housing 6 inside; The rear end of housing 6 inside also is provided with the planetary gearsets 4 as reducing gear, these planetary gearsets 4 rear sides are connected to the motor (not shown) of being located at housing 6 rears, planetary gearsets 4 front sides then connect a driving-disc 5 by tip axle 41, this driving-disc 5 has a centre bore 50, the relative both sides of this centre bore 50 are respectively equipped with a recess 51, and the in addition relative both sides of 90 degree of being separated by then are provided with the fan-shaped bump 52 (as shown in Figure 2) that possesses two symmetrical inclined-planes.Rear end one segment length of described main shaft 1 forms section and is regular polygon, and in embodiment of the present utility model, this section is square, and the part main shaft that this section is square passes the internal diameter of retainer ring 2, and the centre bore 50 that passes driving-disc 5.

Consult Fig. 3 A again, described stopper 3 is the block of an arc, it has first teat 31 that is positioned at the first side central authorities, and second teat 32 and the 3rd teat 33 that are positioned at the second side opposite end, the position of centre of gravity of this stopper 3 pivot 34 that is pivoted, when stopper 3 is combined between retainer ring 2 internal diameters and the main shaft 1, pivot 34 is contained in the recess 51 of driving-disc 5, and the rectangle that first teat 31 of each stopper 3 is contacted with main shaft 1 respectively on one side, and second teat 32 and the 3rd teat 33 are then all towards the internal diameter wall of retainer ring 2.

By the structure of the present utility model after the combinations thereof, when making main shaft 1 rotation when for example driving tool heads such as drill bit or screwdriver, the set motor of electric tool drives planetary gearsets 4 runnings, planetary gearsets 4 drives driving-disc 5 rotations again, when no matter this driving-disc 5 rotates forward or backwards, the inclined-plane of described fan-shaped bump 52 sides can touch the square limit of main shaft 1 earlier, thereby drives main shaft 1 rotation by driving-disc 5; And 51 of the recesses of driving-disc 5 drive pivot 34 and make stopper 3 along with rotation in retainer ring 2.

Shown in Fig. 3 B, embodiment of the present utility model does not provide electric power and during as hand-operated tools, then stop under the situation of start at motor, when main shaft 1 is bestowed moment of torsion by clockwise direction, first teat 31 of stopper 3 can be subjected to thrust and make stopper 3 be promoted deflection by the internal diameter wall direction toward retainer ring 2, make second teat, 32 first conflict retainer ring 2 internal diameters and produce a reaction force, this moment is when utilizing the seesaw principle to cause main shaft 1 to rotate again, utilize first teat 31 to make the 3rd teat 33 deflections of moving son 3 other ends and conflict retainer ring 2 (shown in Fig. 3 C) as fulcrum, relief second teat 32 props up retainer ring 2 simultaneously with the 3rd teat 33 and average force ground allows main shaft 1 formation lock can't to rotate (shown in Fig. 3 D).

The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. a lever spindle locking mechanism is characterized in that, comprising:

One retainer ring has circular internal diameter;

One main shaft has the outside of regular polygon, and the outside of this regular polygon is arranged in the internal diameter of this retainer ring;

At least two stopper, has first teat that is positioned at the first side central authorities, and second teat and the 3rd teat that are positioned at the second side opposite end, this stopper is located in the inner diameter volume of described retainer ring, and make first teat be contacted with this main shaft, and this second teat and the 3rd teat are respectively towards the internal diameter wall of described retainer ring.

2. lever spindle locking mechanism as claimed in claim 1 is characterized in that, the section of described main shaft is a square, and described stopper includes two, and is located at respectively between the internal diameter wall of the relative both sides of this main shaft and this retainer ring.