초록 ▼

A hammer drill 1 includes a barrel 2 containing a striking mechanism. The drill further includes a motor 4 with a motor shaft 6 encased in a motor accommodating chamber 19 which has an upper opening at which a baffle plate 20 is disposed. The baffle plate 20 includes a bottom portion 21 and a partit

A hammer drill 1 includes a barrel 2 containing a striking mechanism. The drill further includes a motor 4 with a motor shaft 6 encased in a motor accommodating chamber 19 which has an upper opening at which a baffle plate 20 is disposed. The baffle plate 20 includes a bottom portion 21 and a partition 22. The baffle plate 20 further includes a flange 23 that extends radially around the upper edge of the partition 22 except toward the front of the partition 22 with the outer edge of the flange 23 reaching the inner surface of the motor housing 3. Additionally, a generally horizontal slot 24 is formed at the front peripheral surface of the bottom portion 21 of the baffle plate 20. Moreover, a plurality of air inlets 27 are provided at the rear end of a housing handle 5 of the drill 1, whereas a plurality of air outlets 29 are provided at the bottom of the motor housing 3. When air is drawn inside the hammer drill 1 by rotation of a cooling fan 28 fitted on the motor shaft 6, the air travels through the motor 4 upstream of the motor 4 after flowing through the barrel 2 along an extension air passage 30, thus cooling the striking mechanism.

대표청구항 ▼

[ What is claimed is:] [1.]1. A power-driven striking tool having front and rear portions, comprising:a main housing containing a striking mechanism for transmitting hammer blows to a tool bit attached to said front portion;a motor housing connected to the main housing, the motor housing containing

[ What is claimed is:] [1.]1. A power-driven striking tool having front and rear portions, comprising:a main housing containing a striking mechanism for transmitting hammer blows to a tool bit attached to said front portion;a motor housing connected to the main housing, the motor housing containing a motor having a motor shaft on which a fan is provided, wherein the fan, when rotated by the motor, creates an airflow through the motor housing;at least one air inlet provided in the rear of the main housing for admitting said airflow;a closing member extending in front and rear directions for isolating the motor from the main housing; andan air gate configured to allow the airflow to enter the motor housing after passing over a front end of the closing member and through at least a portion of the main housing, thus cooling the striking mechanism.