CN2626128Y

CN2626128Y - Stepped regulating electric tool switch

Info

Publication number: CN2626128Y
Application number: CN 03243560
Authority: CN
Inventors: 沈新权
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-03-28
Filing date: 2003-03-28
Publication date: 2004-07-14
Anticipated expiration: 2013-03-28

Abstract

The utility model relates to an electric tool switch with stepping adjustment, which comprises a shell body, an adjustive handle, a connecting rod, a circuitry board and a switch circuit, the utility model is characterized in that the electric tool switch also comprises a resistance group arranged on the circuitry board, a conductive strip, an electrode group and a brush arranged on the connecting rod and contacted with the conductive strip and the electrode group in a sliding way, the resistance group a plurality of stationary resistors in series, the electrode group is formed by the mutually distant arrangement of a plurality of electrodes which are electrically connected with the derivation nodes of two ends of each resistor, the conductive strip is electrically connected with one end of the resistance group, two ends of the resistance group are connected with the switch circuit. The utility model changes the resistance value of a connecting switch circuit by adjusting the gliding contacting position of the brush on the conductive strip and the electrode group, the purpose of the stepping adjustment is achieved, the utility model preferably solves the problems that the existing potentiometer timing switch has short service life and poor operating stability, etc, thus, the utility model is an ideal electric tool timing switch.

Description

The electric tool switch that stepping is regulated

One, technical field

The utility model relates to the electric tool switch that a kind of stepping is regulated.

Two, background technology

The general stepless time adjustment mode that adopts during existing electric tool switch speed governing, this mode of speed regulation is to realize by the potentiometer resistance in the by-pass cock, potentiometer then slides on a ribbon resistance film by its metal moving contact and changes resistance, because the metal moving contact slidably reciprocates on resistive film continually, make resistive film wearing and tearing even worn out easily, thereby cause the adjusting function of switch to descend, shorten useful life.In addition, in order to keep good contact the between metal moving contact and the resistive film, often can't apply overcoat on the resistive film, therefore, when ambient temperature, when humidity changes, the change in resistance of resistive film is bigger, and the resistance adjustable range of potentiometer is changed, thereby the speed adjustable range of switch is a greater impact, and the job stability of switch is relatively poor.

Three, summary of the invention

At the problems referred to above, it is longer that the purpose of this utility model provides a kind of useful life, the electric tool switch that the stepping of better working stability is regulated.

Order of the present utility model is realized as follows: the electric tool switch that a kind of stepping is regulated, it comprises housing (5), be located at the release handle (4) of housing top, be connected with release handle and extend to connecting rod (2) in the housing, be located at wiring board (1) and switching circuit in the housing, its main points are that it also comprises the resistor group (6) that is located on the wiring board (1), bus (7), electrode group (8), and be located at that connecting rod (2) is gone up and can with the brush (3) of bus (7) and electrode group (8) sliding contact, wherein resistor group (6) is made up of the fixed resistor of some series connection, electrode group (8) is by arranging and form with the some electrodes space that node is electrically connected of drawing at each fixed resistor two ends, bus (7) is electrically connected with an end of resistor group (6), and two terminations of resistor group (6) are gone into switching circuit.

Brush of the present utility model (3) adopts metal material to make.

In the utility model, go up slide realization by brush (3) at bus (7) and electrode group (8) owing to regulate resistance, sliding contact between brush (3) and bus (7) and the electrode group (8) is difficult for causing wearing and tearing, so prolonged the useful life of switch greatly.In addition, be fixed resistor owing to what adopt in the resistor group (6), thus can on each fixed resistor, apply overcoat, so the variation of environment is very little to its influence, can make the service behaviour of switch keep stable.

Four, drawing explanation

Fig. 1 is a structural representation of the present utility model.Among the figure: 1 expression wiring board; 2 expression connecting rods; 3 expression brushes; 4 expression release handles; 5 expression housings.

Fig. 2 is that the A of Fig. 1 is to structural representation.

Fig. 3 is the planar structure schematic diagram of wiring board of the present utility model (1).Among the figure: 6 expression resistor group; 7 expression buss; 8 expression electrode groups.

Fig. 4 is a switching circuit schematic diagram of the present utility model.

Five, embodiment

Below with reference to accompanying drawing the utility model is further described.

As Fig. 1, shown in Figure 2, the electric tool switch that stepping is regulated has housing (5), there is a release handle (4) the housing top, one connecting rod (2) that extends in the housing is arranged under the release handle, side in the housing has a printed substrate (1) that is provided with switching circuit, as Fig. 3, shown in Figure 4, also be provided with the resistor group of forming by the fixed resistor of some series connection (6) on the printed substrate (1), also be printed with bus (7) and electrode group (8) on the printed substrate (1), connecting rod (2) bottom have one can with the brush (3) of bus (7) and electrode group (8) sliding contact, each electrode in the electrode group (8) is electrically connected with the lead-out wire at each fixed resistor two ends in the resistor group (6), bus (7) is electrically connected with resistor group (6) one ends, and switching circuit is inserted at resistor group (6) two ends.When pressing release handle (4), bus (7) and the electrode group (8) of brush (3) on release handle (4) drivening rod (2) on wiring board (1) goes up slip, and when the electrode of diverse location contacts in brush (3) and the electrode group (8), the resistance that inserts the resistor group (6) in the switching circuit has nothing in common with each other, at this moment, the output voltage of switching circuit output also has nothing in common with each other, thereby realizes the purpose that stepping is regulated.

Claims

1, the electric tool switch that a kind of stepping is regulated, it comprises housing (5), be located at the release handle (4) of housing top, be connected with release handle and extend to connecting rod (2) in the housing, be located at wiring board (1) and switching circuit in the housing, it is characterized in that it also comprises the resistor group (6) that is located on the wiring board (1), bus (7), electrode group (8), and be located at that connecting rod (2) is gone up and can with the brush (3) of bus (7) and electrode group (8) sliding contact, wherein resistor group (6) is made up of the fixed resistor of some series connection, electrode group (8) is by arranging and form with the some electrodes space that node is electrically connected of drawing at each fixed resistor two ends, bus (7) is electrically connected with an end of resistor group (6), and two terminations of resistor group (6) are gone into switching circuit.

2, the electric tool switch of stepping adjusting according to claim 1 is characterized in that brush (3) adopts metal material to make.