CN201220392Y

CN201220392Y - Shaft lock apparatus of impact screwdriver

Info

Publication number: CN201220392Y
Application number: CNU2008200407624U
Authority: CN
Inventors: 宋伟; 周红陶
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2008-07-07
Filing date: 2008-07-07
Publication date: 2009-04-15
Anticipated expiration: 2018-07-07

Abstract

The utility model provides a shaft locking device of an impact screw driver. The impact screw driver comprises a housing, a motor arranged in the housing, a driving shaft of the motor, a hammer, a hammer anvil, and a shaft locking device. The shaft locking device comprises a matching part which is matched with the hammer anvil, an engagement ring which is fixed relative to the casing, and a middle part which is embedded between the matching part and the engagement ring. The outer peripheral face of the matching part comprises a yielding surface; the shaft locking device further comprises an engagement part; and the engagement part can be located in a first position and a second position, that is, when the engagement part is located in the first position, the engagement part is clamped between the end part of the yielding face and the engagement ring, the matching part is fixed on the circumferential direction relative to the engagement ring, and the shaft locking device is located in the locking position; when the engagement part is located in the second position, the engagement ring is withdrawn from the space between the end part of the yielding surface and the engagement ring, the matching part can rotate relative to the engagement ring, and the shaft locking device is located in the non-locking position.

Description

Impact the shaft lock device of screwdriver

Technical field

The utility model relates to a kind of shaft lock device, especially, is a kind of shaft lock device that impacts screwdriver.

Background technology

The shaft lock structure has been widely used on the product of electric drill class, such as screwdriver commonly used.After utilizing the motor-driven output shaft to finish first the fixing of screw, the shaft lock structure allows to come screw is further screwed reinforcing by the hand rotation casing with artificial mode again.In addition, when the power drain of the power supply of screwdriver, the shaft lock structure also allows and can tighten or unclamp screw by the casing of hand rotation screwdriver.In a word, this shaft lock structure makes output shaft not rotate with respect to casing in these cases.

The screwdriver that has is also additional circumferential impact function, and such as when tightening certain screw, output shaft applies circumferential hitting power according to predetermined rhythm to this screw under the driving of motor, thereby improves the operating efficiency of screwdriver.

U.S. Pat 2007267207A1 discloses a kind of shaft lock device that uses on the screwdriver that impacts.Adopted in this invention and made main shaft part 21 (main shaft) latch-up structure of main body cover rotation relatively.The structure that this institute decides mechanism is as follows: all sides within the snap rings 25 that is fixed on the main body cover, dispose the side face 21D of main shaft part 21 and smooth yielding face 21C; Between the inner peripheral surface of snap rings 25 and the face of yielding 21C, dispose engaging part 18; Engaging part 18 is nipped between the inner peripheral surface of snap rings 25 and the face of yielding 21C.

Summary of the invention

It is a kind of impacting the shaft lock device that uses on the screwdriver that the purpose of this utility model is to provide, and realizes the combination of impact function and shaft lock function.

To achieve these goals, impact screwdriver of the present utility model comprises casing, is positioned at the motor, motor driving shaft of casing inside, matching by the shaft-driven hammer that can move axially and can rotate around motor driving shaft of motor-driven, with hammer merges hammer anvil and the shaft lock device that is subjected to its strike.

This shaft lock device comprise the counterpart that matches with hammer anvil, and the relatively-stationary engagement ring of casing and be nested in counterpart and engagement ring between middleware.Comprise yielding face on the outer peripheral face of this counterpart, described counterpart is enclosed within on the described hammer anvil and can rotates with described hammer anvil, and this shaft lock device also comprises joggle piece.This joggle piece can be in the primary importance and the second place: when this joggle piece was in primary importance, joggle piece snapped between the end and engagement ring of yielding face, and this counterpart is upwards fixing in week with respect to engagement ring, and this shaft lock device is in latched position; When this joggle piece was in the second place, this joggle piece withdrawed between the end and engagement ring of yielding face, and counterpart can rotate with respect to engagement ring, and this shaft lock device is in non-locked position.

The week of this hammer upwards is provided with the strike jut, and an end of close this hammer of hammer anvil is provided with and hits strike portion that jut matches and that be subjected to its strike.This strike portion with respect to hammer anvil week upwards and the fixed-site axially.

The yielding face of this counterpart lays respectively at the second-class office that makes progress in week of this counterpart, makes a concession the radius of curvature of the radius of curvature of face greater than the excircle of counterpart.This counterpart comprises the cooperation bayonet socket of a pair of circumferential symmetrical distribution, when counterpart was enclosed within the end of close described strike portion of hammer anvil, the bottom that this cooperation bayonet socket blocks strike portion made described counterpart upwards 5 degree only can take place with interior rotation with respect to described hammer anvil in week.

This middleware comprises the reception opening of a pair of circumferential symmetrical distribution, and the yielding face of this reception opening, counterpart and engagement ring are construed as limiting the spacing space of the scope of activities of this joggle piece jointly.Also be provided with the pair of meshing projection on the outer circumference surface of this middleware symmetrically, when described impact screwdriver was in running order, described engagement projections was subjected to the strike of the strike jut of described hammer.

Be provided with a pair of installing hole that is used to be fixed on the screwdriver on the outer circumference surface of this engagement ring symmetrically.

This joggle piece is the pin member of column.

The shaft lock device of this impact screwdriver has been realized the combination of impact and shaft lock function, has improved operating efficiency.

Description of drawings

Fig. 1 is the schematic diagram of impact screwdriver of the present utility model;

Fig. 2 impacts the shaft lock schematic representation of apparatus of screwdriver for this;

Fig. 3 is in schematic diagram on the latched position for the shaft lock device of this impact screwdriver;

Fig. 4 is in schematic diagram on the non-locked position for the shaft lock device of this impact screwdriver;

Fig. 5 is the structural representation of the counterpart of this shaft lock device.

The specific embodiment

As shown in Figure 1, impact screwdriver S of the present utility model comprises casing S200 and gauge tap S100, and the front end of casing S200 is provided with the screwdriver bit S300 of this impact screwdriver S.

As described in Figure 2, the percussion mechanism of impact screwdriver S comprises hammer 1 and hammer anvil 2.This hammer 1 front and back in the axial direction moves reciprocatingly to realize impact function.

On the binary position of circumference of hammer 1, be distributed with a pair of strike jut 100.On hammer anvil 2 a end, be provided with a pair of strike portion 200 symmetrically near hammer 1.This is mutually the angle of 180 degree to strike portion 200.This is formed on the hammer anvil 2 and with hammer anvil 2 strike portion 200 and becomes one, and this upwards and axially just any displacement can not take place with respect to hammer anvil 2 to strike portion 200 in week like this.When hammer 1 rotated, strike portion 200 can be subjected to hammering into shape the strike of 1 strike jut 100.End away from hammer 1 of hammer anvil 2 is a tool heads installation end 210.

The shaft lock device that impacts screwdriver S comprises counterpart 3, middleware 4 and engagement ring 5.

Counterpart 3 is included in a pair of cooperation bayonet socket 310 (only can see that in Fig. 2 one of them cooperates bayonet socket 310) of the second-class office setting that makes progress in week.Also be respectively equipped with a pair of symmetrically arranged yielding face 300 (in Fig. 2, also only can see one of them yielding face 300) on the outer circumference surface of counterpart 3.The architectural feature of this yielding face also can be introduced below in detail.

Middleware 4 comprises and upwards is symmetricly set on the circumference locational a pair of reception opening 420 of halving week, is respectively applied for and receives pair of meshing part 400.The joggle piece 400 here is the pin member of pair of columnar.Also be provided with pair of meshing projection 410 on the outer circumference surface of middleware 4 symmetrically, when impacting screwdriver S when in running order, this engagement projections 410 is subjected to hammering into shape the strike of 1 strike jut 100.

Upwards be arranged with a pair of installing hole 500 that is used to be fixed on the casing S200 week of engagement ring 5.In the installing hole 500 screw thread is arranged, installing hole 500 is fixed on the casing head, make engagement ring 5 not rotate with respect to casing S200 by screw.

The spacing space of the scope of activities that 3 yielding faces 300 of the reception opening 420 of middleware 4, counterpart and engagement ring 5 are construed as limiting joggle piece 400 jointly.The following describes the assembling process of this shaft lock device: counterpart 3 is enclosed within an end of the close strike portion 200 of hammer anvil 2, and will cooperates bayonet socket 310 to snap in the bottom of strike portion 200 respectively.The A/F of cooperation bayonet socket 310 only can rotate in a small angle range behind the feasible bottom that cooperates bayonet socket 310 to snap in strike portion 200, and in the present embodiment, this low-angle is 5 degree.This angle also can further be described below.Next again middleware 4 is enclosed within on the counterpart 3, and the pair of meshing pin 400 of middleware 4 is put into respectively in two reception openings 420.At last engagement ring 5 is enclosed within on the middleware 4.

As Fig. 5 and shown in Figure 3, face 300 is just made a concession in two sides on counterpart 3 excircles, and is smooth than other positions.In other words, the radius of curvature of these two yielding faces 300 is greater than the radius of curvature of the excircle of counterpart 3.Yielding face 300 is divided into three zones, and when engaging pin 400 was in the C zone, the prefabricated diameter of this engaging pin 400 can be mobilizable so that it is in this zone.When engaging pin 400 roll enter L zone or Zone R territory after because the radius of curvature in L zone and Zone R territory is less than the radius of curvature in C zone, this engaging pin 400 is stuck between the inner periphery 510 of yielding face 300 and engagement ring 5 and stiff, is in the state of killing.

Further specify this shaft lock device below in conjunction with Fig. 3 and Fig. 4.

As shown in Figure 3, when user's hand rotation is impacted the casing S200 of screwdriver S,, the tool heads installation end 210 of hammer anvil 2 rotates thereby being subjected to the moment of reaction of the screw that need tighten or unscrew out.Hammer anvil 2 at first clockwise rotates, because the interior rotation of 5 degree only can take place with respect to hammer anvil 2 in counterpart 3, so, after hammer anvil 2 clockwise rotates a small angle, will drive counterpart 3 and clockwise rotate.The hammer anvil 2 of this moment is constant with counterpart 3 generations rotation synchronously and the relative circumferential position.Clockwise rotating of counterpart 3 makes that one of them engaging pin 400 takes place to roll and the Zone R territory of the yielding face of entering on yielding face 300,400 of another engaging pins enter into the L zone of another yielding face 300.So two engaging pins 400 enter into the state of killing simultaneously, this makes counterpart 3 can't rotate with respect to engagement ring 5, also just says that hammer anvil 2 can't rotate with respect to casing S200, so this shaft lock device is in the lock state.

As described in Figure 4, when user's counter-rotation is impacted the casing S200 of screwdriver S, engaging pin 400 with counterpart 3 rotate counterclockwise and the C zone of the yielding face of rolling into 300, this moment, engaging pin 400 was mobilizable, this shaft lock device is in unlock state.If this user continues counter-rotation casing S200, then joggle piece 400 enters engagement region again respectively, and this shaft lock device enters lock-out state again.

The concrete scheme that the utility model is not limited to above to reach accompanying drawing and is disclosed can also have other mode.Need to prove that above embodiment is nonrestrictive.Except this embodiment, the conversion that all those skilled in the art carry out according to general knowledge all drops in the protection domain of the present utility model.

Claims

1. impact the shaft lock device of screwdriver, described impact screwdriver comprises casing, be positioned at the motor of casing inside, motor driving shaft, by the shaft-driven hammer that can move axially and can rotate around described motor driving shaft of described motor-driven, match with described hammer and to merge hammer anvil and the shaft lock device be subjected to its strike, described shaft lock device comprises the counterpart that matches with described hammer anvil, and the relatively-stationary engagement ring of casing and be nested in described counterpart and described engagement ring between middleware, it is characterized in that, the week of described hammer upwards is provided with the strike jut, described hammer anvil is provided with and described strike jut strike portion that match and that be subjected to its strike near an end of described hammer, described strike portion with respect to described hammer anvil week upwards and the fixed-site axially, comprise yielding face on the outer peripheral face of described counterpart, described counterpart is enclosed within on the described hammer anvil and can rotates with described hammer anvil, described shaft lock device also comprises joggle piece, described joggle piece can be in the primary importance and the second place: when described joggle piece is in primary importance, described joggle piece snaps between the end and described engagement ring of described yielding face, described counterpart is upwards fixing in week with respect to described engagement ring, and described shaft lock device is in latched position; When described joggle piece was in the second place, described joggle piece withdrawed between the end and described engagement ring of described yielding face, and described counterpart can rotate with respect to described engagement ring, and described shaft lock device is in non-locked position.

2. the shaft lock device of impact screwdriver according to claim 1, it is characterized in that, the yielding face of described counterpart lays respectively at the second-class office that makes progress in week of described counterpart, the radius of curvature of described yielding face is greater than the radius of curvature of the excircle of described counterpart, described counterpart comprises the cooperation bayonet socket of a pair of circumferential symmetrical distribution, when described counterpart was enclosed within the end of close described strike portion of described hammer anvil, the bottom that described cooperation bayonet socket blocks described strike portion made described counterpart upwards 5 degree only can take place with interior rotation with respect to described hammer anvil in week.

3. the shaft lock device of impact screwdriver according to claim 1, it is characterized in that, described middleware comprises the reception opening of a pair of circumferential symmetrical distribution, the yielding face of described reception opening, described counterpart and described engagement ring are construed as limiting the spacing space of the scope of activities of described joggle piece jointly, also be provided with the pair of meshing projection on the outer circumference surface of described middleware symmetrically, when described impact screwdriver was in running order, described engagement projections was subjected to the strike of the strike jut of described hammer.

4. the shaft lock device of impact screwdriver according to claim 1 is characterized in that, is provided with a pair of installing hole that is used to be fixed on the described screwdriver on the outer circumference surface of described engagement ring symmetrically.

5. according to the shaft lock device of claim 1 or 2 or 3 or 4 any described impact screwdrivers, it is characterized in that described joggle piece is the pin member of column.