DE2106868A1 - Arrangement for changing the speed of a motor fan - Google Patents

Description

Licentia
Patent-Verwaltungs-GmbH Frankfurt / Main

EBHZ - 70/62 February 12, 1971

Bt / dr

Arrangement for changing the speed of a motor fan

The invention relates to an arrangement for changing the speed of a motor fan in a vacuum cleaner electrical switching in the motor circuit by means of a manually operated switch which has at least one permanent switch position o

In vacuum cleaners, it is generally known, based on a by the maximum load capacity of the drive motor for the blower specified maximum speed to make a suction power reduction in that in the motor circuit a resistor is switched on »It is also known to change the speed of a motor by switching it on to change field winding taps. In any case it will

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EBHZ - 70/62 12 _O February 1971

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compared to the nominal power of the motor, a reduction in the power consumed and thus in the speed is carried out with each changeover · All switching stages can remain switched on permanently with the switch provided suction power is still too low to dissolve into the carpet into it entered lint or fibers _o

The object of the invention is to provide an arrangement of the type mentioned at the beginning Kind to create with the only a short-term increase or decrease of the speed over one for continuous operation selected speed is possible.

The solution to this problem is, according to the invention, that the switch has a key position in addition to the permanent switch position from which it automatically returns to the permanent position after actuation.

This makes it possible _{to vacuum ζ · Β ο for} a while with increased suction power in order to pick up lint or fibers that cannot be removed from the carpet with normal suction power. The motor fan can therefore be operated for a selectable time at a speed that is otherwise not desired for continuous operation for temperature, noise or mechanical reasons or makes it very difficult to push the suction nozzle on a carpet with high suction power the switch can also be set to a reduced speed in order to briefly reduce the suction power on sensitive objects. For this purpose, the switch is expediently equipped with a handle which can be adjusted against the force of a spring and which is arranged on or in the immediate vicinity of the device control handle outside the usual surrounding area. To switch the speed, the handle must therefore be operated with one finger

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However, since the force in the finger diminishes after a certain period of time, it is automatically reset to the permanent switch position intended for continuous operation _o Since the handle is also located outside of the usual area around the device control handle, the switch cannot be held in the key position for a longer period of time because by changing the operating position of the hand on the implement control handle a continuous operation of the switch is virtually impossible _o in addition, the key switches can also be configured as a timer which is after a predetermined time in the long switching Stel * · lung switches back · with a vacuum cleaner with a management style that The handle for the switch is expediently arranged on the guide shaft, a switching linkage being guided to the switch arranged in the device housing for reasons of space. So that the guide handle can be removed from the device housing, a coupling is provided in the shift linkage at the screw-in or plug-in end of the guide handle. In addition, the pushbutton switch can also be connected to the handle directly in the guide handle, in which case electrical lines are routed through the guide handle to an electrical coupling provided at the screw-in end of the guide handle, _{or the like}

The invention is described in more detail below with reference to the drawings of an exemplary embodiment.

Show it:

1 shows a vacuum cleaner with a screw-in guide handle in a partially sectioned illustration with one of the guide handle to a switch arranged in the device housing. leading shift linkage

2 shows a cross section through the guide shaft in the area of the handle,

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EBHZ - 70/62 12 February 1971

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3 shows an enlarged illustration of the shift linkage arrangement in the area of the insertion end of the guide shaft and

Figure 4 is an _o Pririzipdarstellung on the design of the guide rod as a coupling at the insertion end of the guide stem ·

A hollow guide handle 2 is detachably attached to the device housing 1 of a vacuum cleaner. At the free end of the guide handle there is a handle 3, in front of which a handle 4 that can be moved in the circumferential direction of the guide handle 2 is arranged 2 arranged rod 5, which emerges at the end of the guide handle reaching into the interior of the device housing 1. This end of the rod 5 is provided with a cam disk 6 which can be brought into engagement with a slide that is adjustable perpendicular to the rod axis. In the adjustment range of this slide 7, which can be moved by means of the cam 6 against the force of a return spring 8, the actuating button 9 of a switch 10 is located.This switch is designed as a pushbutton switch, which only has a stable switch position and in the second switch position only during the actuation time In the stable switch position of switch 10, a circuit provided for normal operation of the fan motor, not shown, is switched on.If, on the other hand, its control button 9 is adjusted, a switchover takes place in the motor circuit, which preferably turns on a higher turning steel. Except for the switch a main switch 11 is also provided, with which the motor can be switched off or a speed selected for continuous operation can be switched on

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EBHZ - 70/62 February 12, 1971

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The opposing engagement surfaces of the cam 6 and the slide 7 are parallel to the Axis of the rod 5 running plane, so that thereby for the attachment or removal of the guide rod 2 from the device— housing 1 a mechanical coupling is formed. The rod 5 with the handle 4 is only in the guide handle 2 adjustable against the force of a spring 12 to ensure that the cam 6 is always in the same position before the guide handle 2 is attached to the device housing 1 occupies and securely engages with the associated engagement surface of the slide 7.

When the vacuum cleaner is operated at a continuously switchable speed of the fan motor, the handle 3 is gripped in the usual manner. The main switch 11, which can have several permanent switching positions, can be used to set a speed provided for permanent operation by switching on, for example, different winding taps of the motor winding or by switching on different series resistors. If this speed is to be increased for a short time, for example, then the handle is rotated against the force of the spring 12 with the thumb of the hand that encompasses the handle and the slide 7 is thereby adjusted via the cam 6 against the force of the return spring 8 to the actuation button 9 via the actuation button 9, the pushbutton switch 10 is then switched over, with which a winding tap of the fan motor is switched on independently of the speed predetermined by the main switch 11, which causes a speed change beyond the maximum speed provided for continuous operation. Particularly heavily soiled areas of a carpet can be cleaned with increased suction power. However, since the actuation of the handle during operation of the vacuum cleaner becomes strenuous and also cumbersome over a long period of time, the pushbutton switch 10 is actually only switched on when necessary. The push button switch 10 can also be mechanically connected to the main switch 11.

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Claims (1)

Claims EBHZ - 70/62 February 12, 1971 Bt / dr Γ \ ■ · ψ \ 1 · JAnordnung altering the rotational speed of a motor fan in a vacuum cleaner by means of electrical switches in the motor circuit by means of a manually operable switch, having at least one Dauerschalts'tellung, characterized in that the switch other than the continuous switching position has a touch position from which it automatically returned to the permanent switching position after actuation 2 »Arrangement according to claim 1, characterized in that that the switch TlO) by a handle adjustable against the force of a spring (12) from the permanent switch position can be brought into the tactile position on or in the immediate vicinity of the device handle outside the usual surrounding area is arranged. 3. Arrangement according to claim 2, characterized in that that in a device (1) provided with a guide handle (2) through the guide handle (2) from the handle (4) Shift linkage (5,6,7) to that arranged in the device housing (1) Switch (10) is performed. "1 4. Arrangement according to claim 3, characterized in that that the handle (4) is adjustable in the circumferential direction of the guide handle (2), that the switching linkage e (5,6,7) with one 209835/0414 EBHZ - 70/62 * 12 February 1971 Bt / dr the handle (4) non-rotatably connected, through the guide handle (2) reaching rod, which on its device housing side End of a cam (6) carries, which with a on the actuating button (9) of the switch (10) acting slide (7) can be brought into engagement 5ο arrangement according to claim 4, characterized in that that the slide (7) can be adjusted perpendicular to the axis of rotation of the cam disk (6) and that the opposing ones Attack surfaces of the cam disk (6) and the slide (7) can also be removed from one another in the direction of the axis of rotation or can be brought into engagement 6o arrangement according to claim 1 or the following, characterized in that the duty cycle of the switch (10) is in the key position is determined by a timer " 7, arrangement according to claim 1 or 2, characterized in that that the switch is directly connected to the handle and that electrical lines from the switch via a electrical coupling between the guide handle and the device housing switched into the circuit of the motor fan are· 8o arrangement according to claim 1 or the following, characterized in that the switch (10) is electrically in series to a main switch (10) and that in the on position of the main switch (11) via the switch (10) a Tapping of the field winding of the fan motor can be switched on, via which an increased excitation of the field winding occurs 209835 / (HU L e r s e i t e