Pressure-vaccum machine

Abstract

The invention relates to a portable blowing and suction machine, comprising a main unit shell, a motor arranged in the shell, a fan which is driven to rotate by the motor, a switch for controlling the rotation of the motor, a blowing and suction accessory which is connected with the main unit shell in a detachable way and a safety mutual interlocking gear arranged between the blowing and suction accessory and the main unit shell; the safety mutual interlocking gear comprises a trigger gear which can motivate a switch only when the blowing and suction accessory is connected with the main unit shell and a lock device for locking the blowing and suction accessory on the main unit shell when the motor is started; the safety mutual interlocking gear further comprises a slide block, when the blowing and suction accessory is separated from the main unit shell, the slide block can restrict the movement of the trigger gear, thus facilitating the installation and connection of the blowing and suction accessory and the main mechanism.

Description

technical field [0001] The invention relates to a hand-held operating device, in particular to a portable blower provided with a safety interlock mechanism. Background technique [0002] The patent specification of U.S. Patent No. US5604954 discloses a blower with a safety interlock mechanism. The safety interlock mechanism is arranged between the volute housing the fan and the main casing. When the volute is blocked by dust such as branches and leaves, it is necessary to clean and maintain the volute and the fan in time; the safety interlock mechanism includes a trigger button, which can only be activated when the volute is connected to the main casing The switch starts the motor to work, and a locking device is used to lock the volute on the main casing when the motor is started, so that the volute cannot be removed from the main casing under the normal working condition of the blower motor. When the switch is turned off and the motor stops rotating, the volute and other ...

AI Technical Summary

Problems solved by technology

[0003] The trigger button of the above-mentioned safety interlock mechanism can slide freely between the first position and the second position when the volute is separated from the main casing. The first position is the position where the switch is closed, and the second position is where the switch triggers the motor to work. position, only when the trigger button is at the first position, the volute can be installed and connected to the main casing, when the trigger button is at the second position, the volute cannot be installed and mated with the main casing, which makes the volute and the main casing It is inconvenient to assemble; and, the safety interlock mechanism is set between the volute and the main casing, and the volute must be installed on the blowpipe or suction pipe of the blower to meet the different working modes of blowing and suction. This increases the production cost; of course, one volute can also be installed, but the volute is connected with the blowpipe and the suction pipe in a detachable manner. Conducive to the storage of the blower

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