JPH03221379A - Power driver - Google Patents

Abstract

PURPOSE:To fasten a screw at the depth in a narrow hole or a groove by providing an angle changing/transferring mechanism freely changing the fitting angle of a bit holder against a casing main body section while transferring the rotating force from a motor to a bit. CONSTITUTION:An angle changing/transferring mechanism 4 freely changing the fitting angle of a bit holder 3 against a casing main body section 2 while transferring the rotating force from a motor to a bit 6 is provided between the bit holder 3 holding the bit 6 and the casing main body section 2 fitted with the bit holder 3. The rotary drive by the motor in the casing main body 2 is surely transferred to the bit 6 held by the bit holder 3 to fasten a screw while the bit holder 3 is rotatably held by the angle changing/transferring mechanism 4.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention rotates a bit by the driving force of a motor,
This invention relates to an electric screwdriver that tightens screws using the rotational force of this bit.

[Conventional technology]

Various electric screwdrivers have been developed that rotate a bit using the driving force of a motor and tighten screws using the rotational force of the bit.

Normally, this electric screwdriver has a bit holder protruding from the tip of the casing body, and is operated while gripping the casing body so that the bit holder is placed directly above the member to be tightened. It looks like this.

[Problem to be solved]

By the way, in such electric screwdrivers, the bit, which is usually attached to a bit holder at the tip of the casing body, is set approximately parallel to the central axis of the casing body, and the mounting angle can be changed freely. I can't. Therefore, the parts where the electric screwdriver can be used are limited to those where the part directly above the member to which the screw is to be tightened is open.For example, as shown in Figure 5, the part where the screw hole is opened It cannot be used for something like the assembly member 101 where the open space above 100 is narrow, causing inconvenience.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional drawbacks, it is an object of the present invention to provide an electric screwdriver that can be used freely anywhere that has enough space to accommodate the casing body.

[Means to solve the problem]

That is, the present invention is an electric screwdriver that rotates a bit by the driving force of a motor and screws a screw by the rotational force of the bit, which comprises: a bit holder for holding the bit; a casing main body to which the bit holder is attached; In between, it has an angle change transmission mechanism that freely changes the mounting angle of the bit holder relative to the casing body while transmitting the rotational force from the motor to the bit.

[Effect]

In the electric screwdriver of the present invention, the angle change transmission mechanism interposed between the front end side of the casing body and the bit holder attached thereto rotatably holds the bit holder with respect to the casing body, and The rotational driving force of the motor can be reliably transmitted to the bit held by the bit holder.

〔Example〕

An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the main parts of an electric screwdriver according to the present invention, and this electric screwdriver 1 is configured to include an angle change transmission mechanism 4 between a casing main body 2 and a bit holder 3. .

The casing main body 2 is internally equipped with a motor, a reduction mechanism, and a clutch mechanism (all not shown), and the driving force of the motor transmitted through these reduction mechanism and clutch mechanism causes the speed reduction in FIGS. As shown in FIG. 2, a drive shaft 5 on the distal end side, which constitutes a part of an angle change transmission mechanism 4 to be described later, is configured to rotate.

The bit holder 3 rotates while holding the bit 6, and as shown in FIGS. 2 and 3, a transmission gear forming part of the angle change transmission mechanism 4 is used. A body 11 is fitted to the proximal end.

The angle change transmission mechanism 4 includes a fixed frame 7 assembled to the casing main body 2, a drive shaft 5 pivotally supported by the fixed frame 7, and a rotatably provided on the tip side of the fixed frame 7. A connecting shaft 8, an intermediate gear body 9 having a bevel gear part 9a fixed to the connecting shaft 8 and meshing with a bevel gear part 5a provided at the tip of the drive shaft 5, and a connecting shaft 8 connected to the fixed frame body 7. A rotating body 10 rotatably supported through the rotating body 10, a transmission gear body 11 rotatably provided on the rotating body 10, and having a bevel gear portion 11a meshing with the bevel gear portion 9a of the intermediate gear body 9; Frame body 7 fixes rotating body 10 at an angle
It is composed of a fixing means 12 for fixing to. The fixing means 12 of this embodiment includes a guide groove 13 formed in an arc shape on the side surface of the fixed frame 7, a guide pin 14 that passes through the guide groove 13 and is attached to the rotating body 10, and this guide. The rotating body 10 is screwed onto the head of the pin 14 at a desired angle.
It is comprised of a fixing screw I5 which is tightened to fix the frame body 7 to the fixing frame 7.

Therefore, according to this embodiment, the rotating body 10 can be rotated at a predetermined angle even when the assembly part 17 has a narrow deep screw hole 16 as shown in FIG. 4, for example. By fixing it, the screw 18 can be reliably tightened.

〔effect〕

As explained above, according to the electric screwdriver according to the present invention, the bit holder side can be rotated and fixed at a desired angle with respect to the casing main body by the rotation angle change transmission mechanism, so that It is now possible to tighten screws even in narrow holes or deep inside grooves, which was previously impossible, dramatically expanding the range of applications.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a schematic perspective view showing the main parts of the electric screwdriver according to the present invention, FIG. 2 is a side sectional view showing the main parts of the electric screwdriver shown in FIG. FIG. 4 is an explanatory diagram showing how the electric screwdriver according to the present invention is used, and FIG. 5 is an explanatory diagram showing the drawbacks of the conventional electric screwdriver. 6... Bit, 18... Screw, 3... Bit holder, 2... Casing body, 4... Angle change transmission mechanism.

Claims (1)

[Claims] 1. An electric screwdriver that rotates a bit using the driving force of a motor and tightens a screw using the rotational force of the bit, which comprises: a bit holder that holds the bit; a casing body to which the bit holder is attached; An electric screwdriver characterized by having an angle change transmission mechanism that freely changes the mounting angle of the bit holder relative to the casing body while transmitting the rotational force from the motor to the bit.