JPH10156739A - Screw driver of type convertible between power-assisted rotation and high-speed rotation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the controllability of a screw driver for fastening screws, etc. SOLUTION: This screw driver includes an input gear 10, an output gear 20, an interlocking gear train 30 interlocking the input with output gears, a gear box 40 enclosing each gear, a grip 50, a bit 60, an attaching part 70 capable of attaching the grip or the bit to the ends of the input and output gears, and a constant speed fixing device 80 located in the gear box or the grip. The interlocking gear train can move in the direction of the axis of the gears, and the screw driver has a mechanism for changing functions among a power- assisted rotating function, a high-speed rotating function, and a constant-speed rotating function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver device for fastening a screw or the like.

[0002]

2. Description of the Related Art A driver device for tightening a direct rotation screw or the like, a ratchet gear type driver device with a forward / reverse rotation switching device, or an electric driver device is known.

[0003]

In a conventional driver device, a screw or the like is tightened by direct rotation. However, the driver device cannot be rotated with a force greater than the grip force, and since the rotation ratio is 1: 1 the screw or the like is not used. Can be tightened only at a constant speed when it is desired to fasten.

[0004]

The present invention utilizes a combination of gears having different numbers of teeth. The input and output gears generate different rotational speeds depending on the gear ratio between an interlocking gear group, an input gear, and an output gear. Replacement of the grip mounted on the gear portion and the bit mounted on the output gear portion, or the movement of the interlocking gear group in the axial direction of the gear uses different rotation speeds. (Each of the input gear, output gear, and interlock gear group
If necessary, the rotational speed can be arbitrarily increased or decreased by changing the configuration of the number of gear teeth and the number of gear combinations. In addition, the input gear and the output gear (the input and output are switched by the replacement) are provided with detachable parts to which a grip or a bit can be attached and detached, and the rotation number is output by replacing the attached grip or the bit. Available as a department.
Further, a grip may be fixed to a shaft portion having an attachment / detachment portion for an input gear and an output gear, and the rotation speed may be used by replacing a bit. (When attaching or detaching a grip or bit, a detent is provided on the attachment / detachment part, and a fitting part is provided on the grip or bit to engage with the detent on the attachment / detachment part. The grip or bit is prevented from falling off by magnetic force, or the grip or bit is prevented from falling off by friction, or the grip or bit is prevented from falling off by tightening screws etc. , Or a grip or bit tightened with a band brake to prevent falling off.) The bit can also be used for a Phillips screw, a flat screw, a hexagon stick bit, a socket wrench, etc. The diameter of each bit can be selected depending on the application. In addition, the constant-speed fixing device fixes the rotation of the interlocking gear group in a releasable manner, or provides a detent for preventing rotation of the gear box and the grip, and directly or detachably connects the input and output gears to each other. : 1 constant speed rotation. Further, the grip may be T-shaped, and an electric device may be incorporated into the grip, or a torque gauge may be incorporated to measure the weight of rotation.

[0005]

As described above, by interlocking the input gear and the output gear with the interlocking gear group, the number of revolutions of the input gear and the number of revolutions of the output gear are different from each other. As an example, when the rotation ratio is 4: 1, (1) When the input gear (grip portion) makes four rotations at a rotation ratio of 4: 1, the output gear (bit portion) makes one rotation, and the output gear changes with respect to the input torque of the input gear. Provides a boosted output torque of four times. For example, when the input gear is rotated with a force of 10 kg, a boosted output rotation of 40 kg, which is four times, is obtained. (2) The rotation ratio is 1: 4 due to replacement of the grip and bit, replacement of the bit, or movement of the interlocking gear group in the axial direction.
When the input gear (grip portion) makes one rotation, the output gear (bit portion) can obtain a high-speed output rotation with a rotation speed of four times. For example, when tightening an ISO screw M6 × 50 mm screw, a conventional constant-speed screwdriver rotates the grip 50 times and tightens the screw, but a booster-speed high-speed rotation replaceable screwdriver can complete the screw tightening in 12 and 5 turns. .

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a driver of the present invention. FIG. 1 shows an input gear 10 and an output gear 20 and an interlocking gear group 30 incorporated in a gear box 40 in an interlocking manner, and a detachable attachment / detachment of a grip 50 or a bit 60 at an end of the input gear 10 and the output gear 20. A part 70 is provided. By exchanging the attached grip 50 and the bit 60, a difference in the number of revolutions specific to each of the input and output gears generated by the interlocking of the interlocking gear group 30, the input gear 10, and the output gear 20 can be used. The 20 unique rotation speeds are used interchangeably. When the switch 90 of the constant velocity fixing device 80 provided on the gear box 40 is moved, the grip 50
, The bit 60 and the gear box 40 are directly connected and integrated, and the rotation ratio becomes 1: 1. The grip 50 and the bit 60 rotate directly. The ball bearing 100 is the input gear 1
Buffers the friction of the contact surface of the input / output gear due to the rotation difference between the 0 and the output gear 20 to prevent wear of the abutment portion between the input gear and the output gear, and also provides light operation and smooth movement. It is. In FIG. 2, the grip 50 'is fixed to both the shafts of the input gear and the output gear, and the rotation speed of the output unit can be changed by replacing the bit 60 of the attachment / detachment unit 70'. In FIG. 3, the combination of the number of rotations can be changed by moving the interlocking gear group 30 'in the axial direction of the gear to switch between the boost output rotation and the high speed output rotation. FIG. 4 shows a constant velocity fixing device 80.
When the switch 90 is slid and the rotation of the interlocking gear group 30 is fixed, direct rotation of the grip and the bit can be performed. Example of rotation combination High-speed output rotation = (A) boost output rotation =
(B) Constant speed rotation = (C) where (A) + (B) + (C) · (A) + (B) ·
(A) + (C) ・ (B) + (C)
It can also be used as a driver for the single function (A) or (B). The usage method is as follows. When the grip is controlled by controlling the rotation of the gear box, the bit rotates at the set rotation speed, and when the constant speed fixing device is set, the rotation ratio is 1: 1.
Next, the grip and bit are directly connected, and it becomes a direct rotation. Examples of mounting of screws, nuts for automobile tools, vehicle tools, marine tools, construction tools, electric appliance tools, general household tools, other appliance tools, etc.
It can be widely used for removal.

[0007]

According to the present invention, the rotation operation of the grip can be strongly tightened with a smaller operation force than the conventional screwdriver having a rotation ratio of 1: 1 at the position of the boost output rotation function, and on the contrary, it can be tightly tightened and loosened. A small screw can be removed with a small force. In the position of the high-speed rotation function, the screw can be fastened by using the high-speed rotation output. Further, a great effect can be obtained as a labor-saving tool in an aging society in which physical strength declines.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a position of a boost output rotation with a grip and a bit attached.

FIG. 2 is a partial cross-sectional view in which grips are fixed to both detachable member portions of an input / output gear.

FIG. 3 is a cross-sectional view showing a high-speed rotation of a switching mechanism between high-speed rotation and boosted rotation.

FIG. 4 is a sectional view taken along line A-A of FIG.
It is sectional drawing of A '.

[Explanation of symbols]

 10.10 '... input gear 20.20' ... output gear 30.30 '... interlocking gear group 40.40' ... gear box 50.50 '. 50 "... grip 60 ... bit 70.70 '... attachment / removal part 80.80' ... constant speed fixing device 90.90 '... switch 100 ... ball bearing

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[Procedure amendment]

[Submission date] December 18, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

The present invention is applied to a combination of gears having different numbers of teeth, and generates a different rotation speed for each of the input and output gears according to the gear ratio of the interlocking gear group and the input and output gears. And the bits mounted on the output gear section are replaced, or the interlocking gear group is moved in the axial direction of the gear to use different rotational speeds. (Each of the input gear, the output gear, and the interlocking gear group can arbitrarily increase or decrease the number of revolutions by changing the configuration of the number of gear teeth and the number of gear combinations if necessary.) Also, the input gear and the output gear (by replacement) An input / output is interchanged), and an end is provided with a detachable portion to which a grip or bit can be attached and detached. By replacing the attached grip or bit, the respective rotation speed can be used as an output portion.
Further, a grip may be fixed to a shaft portion having an attachment / detachment portion for an input gear and an output gear, and the rotation speed may be used by replacing a bit. (When attaching or detaching a grip or bit, a detent is provided on the attachment / detachment part, and a fitting part is provided on the grip or bit to engage with the detent of the attachment / detachment part. The grip or bit is prevented from falling off by magnetic force, or the grip or bit is prevented from falling off by friction, or the grip or bit is prevented from falling off by tightening screws etc. Or, there are methods such as grips or bits that are tightened with a band brake to prevent them from falling off.) Furthermore, bits can be used for Phillips screws, flathead screws, hexagon stick bits, socket wrench, etc. The diameter of each bit can be selected depending on the application. In addition, the constant-speed fixing device fixes the rotation of the interlocking gear group in a releasable manner, or provides a detent for preventing rotation of the gear box and the grip, and directly or detachably connects the input and output gears to each other. : 1 constant speed rotation. Furthermore it is also possible to grip the T-type, also bi embedded electric device on the grip
You can control the rotation of the gears or measure the weight of the rotation by incorporating a torque gauge.
By replacing it with a planetary gear set, simplifying the structure and reducing the size
The same effect as the effect that can be reduced and the rotation ratio can be increased
can get.

Claims (4)

[Claims] 1. An input gear and an output gear, an interlocking gear group interlocking with the input gear and the output gear, a gear box accommodating the respective gears, a grip and a bit, and ends of the input gear and the output gear. A booster-rotating high-speed rotation replaceable screwdriver further comprising a detachable portion for attaching and detaching the grip or the bit. 2. The driver according to claim 1, wherein a grip is fixed to a shaft provided with a detachable portion for the input gear and the output gear. 3. The driver according to claim 1, wherein the gear box or the grip is provided with a constant speed fixing device. 4. The driver according to claim 1, wherein the interlocking gear group can move in the axial direction of the gear.