CN2467277Y - Mainshaft locking apparatus for electric tool - Google Patents

Abstract

The utility model relates to a main-shaft locking device for an electric tool. A casing seat is provided with a circular containing hole and the inner part of the circular containing hole is provided with a plurality of arc brake blocks; both ends of each brake block are respectively provided with a bulging block which can axially bulge; the inside of each brake block is provided with the bulge part; the inner part of the containing hole is provided with an output shaft; the output shaft is provided with a cam and the cam can carry out the synchronous rotation following the output shaft; in addition, the utility model is provided with a driving disk which is combined with a speed changing gear set; the surface of the driving disk is provided with a plurality of dragging blocks; each dragging block is positioned between two bulging blocks of the brake block.

Description

The electric tool spindle lock

The utility model relates to a kind of electric tool spindle lock, referring in particular to it can drive output shaft and be rotated when power is provided, and when stopping power, then can't make the device of this output shaft rotation with external force, use and reach handling instrument first watch, and can provide as hand-operated tools and use for convenient.

The known electric tool of going up such as electric drill is with driven by power, and include plug-in, rechargeable or fill, design such as plug-in dual-purpose type; Electric drill not only can be in order to 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 can not be timely 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.Yet, traditional 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, this 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, that is it in fact also can't do the hand drill use.

Moreover, but traditionally such as the electric tool of clamping device heads such as electric drill, its clamping device of being located at front end is to be incorporated into output shaft, and this clamping device include several jaws and with a knob of the concentric setting of output shaft, be control by this knob of rotation these jaws synchronously towards center position by moving the clamping device head, or synchronously past radiation direction is removed to loosen tool heads; But because this clamping device is to be located at output shaft,, rotate this knob with the another hand again, that is it must both hands use together can operate smoothly, its inconvenience is arranged in the use so when rotating its knob, must hold the fixedly head that is combined in this output shaft with one.

The purpose of this utility model is to propose a kind of electric tool spindle lock of being made up of shell block, cam, brake shoes, output shaft and driving-disc, and it has stable braking effect, thereby has solved the existing in prior technology problem.

The technical scheme that the utility model adopted is, it comprises the brake shoes and a driving-disc of a shell block, an output shaft, a cam, several arcs, this shell block has containing hole, and wears this output shaft in shell block, makes output shaft to rotate with respect to shell block; This cam is the rear end that is matched with this output shaft, and cam can be rotated synchronously along with output shaft; Aforesaid several brake shoes are arranged in the containing hole of this shell block, and the medial surface of brake shoes is provided with radially outstanding jut; The central authorities of this driving-disc are provided with a centre bore that can pass for the rear end of aforementioned output shaft, and form the necking section between central relative two sides of this centre bore, during this driving-disc rotation, can affect brake shoes to remove braking state and can drive output shaft, cam and brake shoes and rotate simultaneously, stop power and work as driving-disc, but during by the output shaft reverse rotation, then cam will promote the jut of brake shoes, and then make and produce frictional force between the inwall of containing hole of brake shoes and above-mentioned shell block and maintain static, it is characterized in that:

The internal diameter wall of this containing hole is provided with embossing;

The external diameter of this cam is provided with several protuberances that equal angles distributes, and constitutes a recess between two protuberances;

The opposite end of this brake shoes has the outstanding projection of past central axis direction respectively, and the outer surface of brake shoes is provided with embossing, and inner surface is provided with jut;

This driving-disc, its card is provided with several brake blocks, and the length of this brake block is less than the distance between two projections of an aforementioned brake shoes;

By aforesaid structure, when driving-disc rotates, can be by this brake block restriction brake shoes swing, thereby can drive output shaft, cam and brake shoes and rotate simultaneously, stop power and work as driving-disc, but during by the output shaft reverse rotation, then cam will promote the jut of brake shoes inboard and cause brake shoes swing, generation frictional force between the outer surface that makes brake shoes and the inwall of above-mentioned containing hole and maintaining static.

Characteristics of the present utility model are:

Because it is provided with three and can arranges conglobate arc brake piece, these three brake shoes can be limited not deflection when being activated the dish driving and can drive cam and output shaft rotation, and when the output shaft active rotation, the cam that then is subjected to the output shaft drive and rotates can affect three brake shoes deflections simultaneously, and then make three brake shoes be contacted with the containing hole internal face of shell block simultaneously, to obtain more stable braking effect.

Next is that it is equipped with embossing at the outer surface of brake shoes and the internal face of shell block containing hole, makes when brake shoes is contacted with the internal face of containing hole, produces bigger frictional force by embossing contacts with each other, and makes braking effect more firm.

Fig. 1 is the three-dimensional exploded view of each element syntagmatic of locking device of the present utility model.

Fig. 2 is the section plan of each element combination back structure of Fig. 1.

Fig. 3 is along the section plan of A-A direction among Fig. 2.

Fig. 4 is output shaft when rotation of Fig. 3, and each brake shoes is pushed open and the planar gesture figure that brakes toward lateral direction.

Further specify preferred embodiment of the present utility model in conjunction with above-mentioned each accompanying drawing now.

As shown in Figures 1 and 2, electric tool spindle lock provided by the utility model, it includes a shell block 1 that is combined in electric tool housing (not shown), one end of shell block 1 is provided with a containing hole 11, and the internal face of containing hole 11 is provided with embossing 110, be provided with an output shaft 2 by the bearing cooperation in the shell block 1, output shaft 2 can be rotated freely with respect to shell block 1; The rear end 21 of output shaft 2 forms to be seen to look by the end and is non-circular form (the utility model embodiment is for being whittled into the design on plane in relative two sides of output shaft of circle).The rear end 21 of output shaft 2 is to be equipped with a cam 5, makes that cam 5 can be along with output shaft 2 rotates synchronously in the containing hole 11 of shell block 1.The utility model is several protuberances 52 that are provided with the equal angles distribution at the external diameter of cam 5 for the preferred embodiment of cam 5, and constitutes a recess 53 between two protuberances 52, thereby the cam external diameter that constitutes all undulates of ring alternately of protuberance 52 and recess 53; The center of cam 5 is provided with a through hole 51 corresponding to rear end 21 shapes of output shaft 2 in addition, can be output when making through hole 51 be sleeved on the rear end 21 of output shaft 2 that axle 2 drives and rotation synchronously.The utility model further includes three brake shoes 3 that are circular arc, make these three brake shoes 3 all insert in the containing hole 11 of shell block 1 after, become a shape around making its outer shroud just corresponding to containing hole 11 internal diameters.The two ends of aforementioned each brake shoes 3 are respectively equipped with toward axially outstanding projection 31, and the preferred embodiment of this projection 31 is to form prismatoid; The outer surface of brake shoes 3 is provided with embossing 33, and the central authorities of medial surface then are provided with jut 32, in the time of in brake shoes 3 is inserted containing hole 11, the two ends of brake shoes 3 is inserted in the recess 53 of cam 5 (as shown in Figure 3).

Driving-disc 4 provided by the utility model is used for driving output shaft 2 rotations.The structure of this driving-disc 4 is that the central authorities at a disk body are provided with a centre bore 42 that can pass for the rear end 21 of above-mentioned output shaft 2, and be formed with necking section 421 between central relative two sides of centre bore 42, the front end card of driving-disc 4 is provided with the flange 41 of a circle, be equipped with three brake blocks 411 at the periphery of flange 41, and each brake block 411 forms the crescent or half moon body, in addition, the length between each brake block 411 two ends is slightly less than the distance between the aforementioned projection 31 that is located at brake shoes 3 two ends; The rear end card of driving-disc 4 is provided with several projections 43, those projections 43 be in order to assembling pinion (not shown) constituting the planet fluted disc, and then the change-speed gearing group that those pinions is matched with establish in addition and can being driven to rotate.

When driving-disc 4 is combined in shell block 1, be that each brake block 411 is inserted between two projections 31 of each brake shoes 3; And, two the swing extreme angles that slightly are sector space 422 in of the rear end 21 of output shaft 2 in driving-disc 4 centre bores 42 are greater than the pendulum angle of brake block 411 between two projections 31, can allow brake block 411 touch the inclined-plane of projection 31 earlier when making driving-disc 4 rotations.

By the utility model device after above-mentioned each element combination, the set motor of electric tool is to drive the change-speed gearing group running that is provided with in addition, the change-speed gearing group drives driving-disc 4 rotations again, when no matter driving-disc 4 rotates forward or backwards, because the two ends and the distance between two projections 31 of brake block 411 are very near, so brake shoes 3 swings can be limited in the two ends of brake block 411, thereby make and keep discontiguous state (as shown in Figure 3) between the outer ring surface of brake shoes 3 and containing hole 11 inner faces, make driving-disc 4 can drive output shaft 2, brake shoes 3 and cam 5 rotate simultaneously.

When motor does not provide electric power and desires as hand-operated tools, when then bestowing output shaft 2 moments of torsion, the rear end 21 of output shaft 2 will drive cam 5 and rotate, when cam 5 rotates, its protuberance 52 will promote the jut 32 of three brake shoes 3 inner faces simultaneously, and then make brake shoes 3 expand outwardly and make the embossing 33 of its outer ring surface be contacted with the embossing 110 of containing hole 11 inner faces and clip brake (as shown in Figure 4), thereby make driving-disc 4 to be driven to rotate, at this moment, output shaft 2 promptly is in stationary state and can't rotates, and the user can directly do hand-operated tools and use.

Above-described only is in order to explain preferred embodiment of the present utility model; be not that attempt is done any pro forma restriction to the utility model according to this; so; all have in that identical creation spirit is following do relevant any modification of the present utility model or change, all must be included in the category of the utility model claims protection.

Claims (1)

1, a kind of electric tool spindle lock, it comprises the brake shoes and a driving-disc of a shell block, an output shaft, a cam, several arcs, this shell block has containing hole, and wears this output shaft in shell block, makes output shaft to rotate with respect to shell block; This cam is the rear end that is matched with this output shaft, and cam can be rotated synchronously along with output shaft; Described several brake shoes are arranged in the containing hole of this shell block, and the medial surface of brake shoes is provided with radially outstanding jut; The central authorities of this driving-disc are provided with a centre bore that can pass for the rear end of described output shaft, and form the necking section between central relative two sides of this centre bore, it is characterized in that:

The internal face of this containing hole is provided with embossing;

The external diameter of this cam is provided with several protuberances that equal angles distributes, and constitutes a recess between two protuberances;

The opposite end of this brake shoes has the outstanding projection of past central axis direction respectively, and the outer surface of brake shoes is provided with embossing, and inner surface is provided with jut;

This driving-disc, its card is provided with several brake blocks, and the length of this brake block is less than the distance between two projections of a described brake shoes.

Images