CN201376107Y

CN201376107Y - Function switch device for electric hammer

Info

Publication number: CN201376107Y
Application number: CN200920115357U
Authority: CN
Inventors: 何晓兵; 潜建芳; 徐忠鑫
Original assignee: ZHEJIANG HENGYOU ELECTROMECHANICAL CO Ltd
Current assignee: ZHEJIANG HENGYOU ELECTROMECHANICAL CO Ltd
Priority date: 2009-03-16
Filing date: 2009-03-16
Publication date: 2010-01-06
Anticipated expiration: 2019-03-16

Abstract

The utility model relates to a function switch device for an electric hammer. The electric hammer comprises a case body, a crank shaft, a first gear matched with the crank shaft, a gear shaft and a second gear matched with the gear shaft. The function switch device comprises a knob, a first clutch, a first spring, a first shift fork, a second clutch, a second spring, a second shift fork and a stop plate, wherein the knob is axially fixed in a knob hole of the case body, the back of the knob is provided with two action points at interval, the two action points of the knob are arranged on the middle position under the first shift fork and the second shift fork, and the stop plate is fixed on the case body above the second clutch. The utility model realizes the switch of I, II, III and IV functions by one switch knob, and the knob has four functions through the transfer of all the clutches, so the utility model has simple structure, reliable use and low cost.

Description

A kind of function change-over device of electric hammer

(1) technical field

The utility model relates to a kind of function change-over device of electric hammer.

(2) background technology

Electric hammer is a kind of in the electric tool, is mainly used in to build industrial and commercial bank's industry, can increase work efficiency greatly.Switch basic based on the function of at present general electric hammer and be to switch, reach brill/hammer drill/three kinds of different functions of hammer, perhaps switch by three different transfer strips with an independent knob by two different knobs, but complex structure, reliability is low.

(3) utility model content

The utility model mainly is to solve above-mentioned existing technical problem, provides a kind of simple in structure, reliable operation, the function change-over device of electric hammer with low cost.

Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals:

The function change-over device of described electric hammer, described electric hammer comprise casing, bent axle, first gear that cooperates with bent axle, gear shaft and second gear that cooperates with gear shaft,

Described function change-over device is made up of knob, first clutch, first spring, first shift fork, second clutch, second spring, second shift fork and check plate;

Described knob is axially fixed in the knob hole of casing, and the knob back is interval with two application points, and two application points of knob place first shift fork and centre position, second shift fork below;

Described first clutch is connected with spline with bent axle, and second clutch is connected with spline with gear shaft;

The interior nose end of described first shift fork is fixed on the centre of first clutch and first gears engaged part, and the guide plate end of first shift fork is located in the guide groove of casing;

The interior nose end of described second shift fork is fixed on the centre of second clutch and second gears engaged part, and the guide plate end of second shift fork is located in the guide groove of casing;

The guide plate of described first shift fork and second shift fork all is splayed and arranges;

The middle footpath of described first spring increases from top to bottom and is fixed on the first clutch boss platform excircle, and the middle footpath of second spring increases from top to bottom and is fixed on the second clutch boss platform excircle;

Described check plate is fixed on the casing of second clutch top.

Further, be provided with annular groove in the described knob hole, on annular groove, knob carried out axial restraint with circlip for shaft.

Further, described knob back is provided with the curved month type cam, and the cam both ends constitute two application points.

Further, described knob back is provided with the eccentric pivot pin of two different eccentric throws, and two pivot pins constitute two application points.

Function change-over device of the present utility model is to realize conversion between I, II, four kinds of functions of III, IV by same switch knob, transmits by each clutch, plays the switching effect of a button four functions, and simple in structure, and reliable operation is with low cost.

(4) description of drawings

Fig. 1 is the structural representation of the electric hammer function change-over device of embodiment 1;

Fig. 2 is the shift fork location drawing of the utility model when being in function I;

Fig. 3 is the shift fork location drawing of the utility model when being in function II;

Fig. 4 is the shift fork location drawing of the utility model when being in function III;

Fig. 5 is the shift fork location drawing of the utility model when being in function IV;

Fig. 6 is the structural representation of the knob of embodiment 1;

Fig. 7 is the structural representation of the knob of embodiment 2.

(5) specific embodiment

Below by embodiment, and in conjunction with the accompanying drawings, the technical solution of the utility model is described in further detail.

Embodiment 1

With reference to Fig. 1, a kind of function change-over device of electric hammer, described electric hammer comprise casing, bent axle 1, first gear 2 that cooperates with bent axle 1, gear shaft 3 and second gear 4 that cooperates with gear shaft 3,

Described function change-over device is made up of knob 5, first clutch 6, first spring 7, first shift fork 8, second clutch 9, second spring 10, second shift fork 11 and check plate 12;

Described knob 5 is axially fixed in the knob hole of casing, and the knob back is interval with two application point a, and b, two application points of knob 5 place first shift fork 8 and centre position, second shift fork, 11 below;

Described first clutch 6 and bent axle 1 are connected with spline, and second clutch 9 and gear shaft 3 are connected with spline; The interior nose end of described first shift fork 8 is fixed on the centre of first clutch 6 and first gear, 2 mates, and the guide plate end of first shift fork 8 is located in the guide groove of casing;

The interior nose end of described second shift fork 11 is fixed on the centre of second clutch 9 and second gear, 4 mates, and the guide plate end of second shift fork 11 is located in the guide groove of casing;

The guide plate of described first shift fork 8 and second shift fork 11 all is splayed and arranges;

The middle footpath of described first spring 7 increases from top to bottom and is fixed on the first clutch 6 boss platform excircles, and the middle footpath of second spring 10 increases from top to bottom and is fixed on the second clutch 6 boss platform excircles;

Described check plate 12 is fixed on the casing of second clutch 9 tops.

Be provided with annular groove in the described knob hole, on annular groove, knob 5 carried out axial restraint with circlip for shaft.

With reference to Fig. 6, described knob 5 backs are provided with curved month type cam 13, and cam 13 both ends constitute two application point a, b.

The course of work of the present utility model is:

1. function I shelves: with reference to Fig. 2, when knob is threaded to the I shelves, switch knob application point a overcomes the effect of first spring force and up presses first shift fork 8, displacement by first shift fork 8, make the first clutch 6 and first gear 2 throw off, application point b then walks idle stroke, and is inoperative, second clutch 9 still meshes with second gear 4, thereby realizes the brill function of I shelves.

2. function II shelves: with reference to Fig. 3, when knob is threaded to the II shelves, application point a is toward bottom offset, first clutch 6 is under the effect of first spring 7, with the engagement of first gear 2, and the application point b idle stroke that remains unchanged away is inoperative, the second clutch 9 and second gear 4 still keep engagement, thereby realize the hammer drill function of II shelves.

3. function III shelves: with reference to Fig. 4, when knob is threaded to III shelves (regulating the operating angle shelves), application point a walks idle stroke, inoperative, the first clutch 6 and first gear 2 are in engagement, and application point b overcomes the effect of second spring, 10 power, up press second shift fork 11, by the displacement of second shift fork 11, make the second clutch 9 and second gear 4 throw off, second clutch 9 positions are between the check plate 12 and second gear 4, at this moment, can adjust operating angle by the sharp flat chisel of rotation head, finally be locked, thus the requirement of realization different operating angle.

4. function IV shelves: with reference to Fig. 5, when sharp flat chisel regulates operating angle, when knob was threaded to the IV shelves, switch knob application point b continued toward top offset, drive the and then up action of second shift fork 11, thereby make second clutch 9 also up motion throw off more with second gear 4, and snap in the check plate 12, the operating angle of sharp flat chisel is locked, the idle stroke and application point a remains unchanged away, inoperative, the first clutch 6 and first gear 2 are still in engagement, thus the hammer function of realization IV shelves.

Embodiment 2

As different from Example 1:

eccentric pivot pin

14,15, two pivot pins that knob 5 backs are provided with two different eccentric throws constitute two application point a, b, as shown in Figure 7.Other is identical with embodiment 1.

Claims

1, a kind of function change-over device of electric hammer, described electric hammer comprise casing, bent axle, first gear that cooperates with bent axle, gear shaft and second gear that cooperates with gear shaft, it is characterized in that:

Described first clutch is connected with spline with bent axle, and second clutch is connected with spline with gear shaft; The interior nose end of described first shift fork is fixed on the centre of first clutch and first gears engaged part, and the guide plate end of first shift fork is located in the guide groove of casing;

Described check plate is fixed on the casing of second clutch top.

2, the function changing-over mechanism of electric hammer according to claim 1 is characterized in that: be provided with annular groove in the described knob hole, with circlip for shaft knob carried out axial restraint on annular groove.

3, the function changing-over mechanism of electric hammer according to claim 1 and 2 is characterized in that: described knob back is provided with the curved month type cam, and the cam both ends constitute two application points.

4, the function changing-over mechanism of electric hammer according to claim 1 and 2 is characterized in that: described knob back is provided with the eccentric pivot pin of two different eccentric throws, and two pivot pins constitute two application points.