JP2009083054A - Electrically-driven tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrically-driven tool with a bit storing part, which prevents unstable holding of a bit and has higher durability against environmental changes of temperature, humidity and the like, and continuous use. <P>SOLUTION: The electrically-driven tool has a motor, a housing therefor, and a bit storing part which is provided in the housing and stores a bit. The bit storing part has a planar part to depress the bit, and a projecting part to depress a recessed part provided for the bit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bit storage and holding structure for a power tool.

  In a power tool that mounts a bit and performs a screw tightening operation or the like, the bit tip tends to be damaged by the screw tightening operation, and it is necessary to frequently replace the bit. The screw tightening operation using the electric tool is often performed at a work site at a high place. In such a case, it is cumbersome to replace the damaged bit with the bit placed on the ground, and the workability is lowered.

  For this reason, an operator sometimes carries a bit in a pocket or the like and works toward the work site. In such a case, the bit may be lost due to a screw or the like.

  Accordingly, in Patent Document 1, as shown in FIGS. 3 and 4, screws for joining the bit storage portion 3 and the housings 1 a and 1 b are provided at the corners of the battery receiving portion 2 of the housing 1, respectively.

  Further, the bit 4 can be slidably attached to the bit storage portion 3 from both the left and right directions, and the bit fitting portion 5 for preventing the bit 4 from swinging in the circumferential direction and the radial direction is elastically engaged with the bit shaft in the axial direction. A flat plate 7 provided with a stopper 6 for stopping is provided.

JP 2004-174671

  In the case of the structure described above, the stopper 6 provided on the neck 8 of the bit 4 and the flat plate 7 is not completely clamped and held, so it is necessary to provide an appropriate dimensional tolerance. However, due to dimensional tolerances due to mold manufacture and variations in bit maker dimensions, gaps are generated in the axial direction and circumferential direction, resulting in insufficient elastic locking.

  Further, the housing 1 is usually made of resin, and if the dimensional tolerance is reduced, it is difficult to manufacture the mold, and much cost and time are required.

  In addition, the resin parts are shrunk due to changes in temperature, humidity, etc., and the flat plate 7 and the stopper 6 of the housing 1 are different in size and shape and have different shrinkage rates. Therefore, it is extremely difficult to provide appropriate dimensions. It was.

  An object of the present invention is to provide an electric tool including a bit storage portion that prevents bit holding from becoming unstable and has improved durability against environmental changes such as temperature and humidity, continuous use, and the like.

  An electric power tool having a motor, a housing for accommodating the motor, and a bit accommodating portion provided in the housing for accommodating a bit, wherein the bit accommodating portion is a flat portion for pressing the bit and a recess provided in the bit. And a convex portion that presses.

  According to the first aspect of the present invention, there is provided an electric tool including a bit storage portion that prevents bit holding from becoming unstable and enhances durability against environmental changes such as temperature and humidity and continuous use. Can be provided.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall view according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a bit holding unit according to an embodiment of the present invention.

  At the lower part of the bit storage portion 3 provided in the housing 1, a convex portion 9 is provided on the flat plate 7 that presses the neck portion 8, which is a concave portion provided in the bit 4, while preventing the rattling in the axial direction. Is provided.

  In addition, a rib 11 having a flat surface portion 10 that presses a portion other than the neck portion 9 of the bit 4 downward by surface contact is provided on the upper portion of the bit storage portion 3.

  By the bit storage part 3 described above, the bit 4 is always held in a plane by the convex part 9 provided at the lower part of the housing 1 and the flat part 10 provided at the upper part of the housing 1.

  Further, since the bit 4 is clamped and fixed in the vertical direction, the dimensional tolerance can be increased. Therefore, the mold production of the housing 1 is facilitated, and the mold production time and cost can be reduced.

  Further, even if the dimensions change due to environmental changes such as temperature and humidity, or continuous use, the bit is held and fixed, so the durability of holding the bit can be improved.

1 is an overall view according to an embodiment of the present invention. Sectional drawing of the bit holding | maintenance part which concerns on embodiment of this invention. The perspective view which concerns on the conventional embodiment. Sectional drawing which concerns on conventional embodiment.

Explanation of symbols

1 is a housing, 2 is a battery receiving part, 3 is a bit storage part, 4 is a bit, 5 is a fitting part, 6 is a stopper, 7 is a flat plate, 8 is a neck part, 9 is a convex part, 10 is a flat part, 11 is It is a rib.

Claims (1)

A motor and a housing for housing the motor;
A bit storage part for storing a bit provided in the housing;
In an electric tool having
The electric power tool characterized in that the bit storage part has a flat part for pressing the bit and a convex part for pressing a concave part provided in the bit.

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