JP2000084865A - Quick screw driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a quick screw driver which can screw the screw and nut by the same operation as a general hand driver easily and efficiently. SOLUTION: The screwing in a low torque rotation area before the screw tightening up is carried out by turning a finger grip 1 with a finger and outputting this rotation to the bit 7 by increasing the speed by the speed increase device using the planet gear mechanism 3 in a driver main body 2 and efficiently. The screwing requiring a big tightening torque at the screw tightening up time is carried out by turning the hand grip 12 with a hand and transmitting the added force itself to the bit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hand driver for tightening and loosening screws such as screws and nuts (hereinafter, these may be simply referred to as "screw tightening"). More specifically, the present invention relates to a quick screwdriver that can perform extremely efficient screw tightening work only by performing the same operation as a normal hand screwdriver.

[0002]

2. Description of the Related Art Most of industrial products produced today are assembled using screw parts such as screws and nuts. Various drivers have been developed in order to more efficiently perform a screw tightening operation in an assembly process of these products.

[0003] Air drivers, electric drivers, and the like have been developed for the purpose of assembling mass-produced products.
Since the power source must be supplied from the outside and a complicated mechanism is built in, the device is inevitably increased in size. Further, the air driver and the electric driver have a drawback that the use conditions are restricted due to the power source supply.

On the other hand, relying only on the power of the worker's hand,
The most basic tool that does not require a power source such as air or electricity is a hand driver. Several types of hand drivers have been developed with the aim of improving the work efficiency. As an example,
In order to improve the efficiency of screw tightening by the force applied by the operator, there is a hand driver that converts a pressing force applied in the axial direction into a rotational force by using a grooved cam mechanism having a large lead. Since the hand driver requires a large dimension in the axial direction to incorporate the conversion mechanism,
The range of use was limited.

[0005] Further, as an improved type of the hand driver, a structure in which a ratchet mechanism is built-in and a rotation direction of an applied force can be switched or a structure in which a clutch mechanism is built-in and a tightening torque can be adjusted are provided. Things are also known. However, these methods have a problem in that they cannot effectively act on each stage of a tightening preparation operation and a final tightening operation described later.

That is, analyzing the work contents when tightening screws such as screws and nuts using a screwdriver, firstly, as a first step, lightly insert the screw into the tap hole, and immediately before the state where resistance is applied to the rotation of the screw. Until the screw is quickly rotated to advance the screwing state (in this case, little torque is required and rapid rotation is required). (In this case, a tightening torque larger than the rotation speed to be given is emphasized). Also, when the tightened screws, nuts and the like are loosened, although the order is changed, the consideration of the work content is basically the same as above.

[0007]

SUMMARY OF THE INVENTION The present invention has developed a hand driver designed to select a rotation transmission system of the driver main body for each of the above-mentioned two types of work so that efficient work can be performed. To solve the above problems.

Therefore, the present invention enables the bit to be rotated at a transmission ratio several times higher than the rotation applied to the finger grip of the driver during the preparatory work for tightening, while maintaining the basic form of the hand driver. In the lifting operation, the bit was rotated at the same number of rotations as that applied to the handgrip, so that the necessary tightening torque was sufficiently obtained.

[0009]

According to a first aspect of the present invention, there is provided a sun gear fixed to an upper extending position of a socket shaft on which a bit is mounted. A plurality of planetary gears that circumscribe and mesh with the planetary gear are disposed on the carrier, an internal gear that meshes with the planetary gear is disposed at a predetermined position, and is disposed at an upper end portion of the driver with the internal gear and the driver body via a connector. A hand provided with a finger grip provided on the outer peripheral portion of the driver body on the bit side, which is fixed to the carrier, and provided on the outer peripheral portion of the driver body on the grip end body side. A quick screwdriver wherein a grip is attached via a fixing plate so as to be integrated with the socket shaft.

According to the present invention having the above-described structure, in the tightening preparation work stage, when the finger grip is slightly rotated with the fingertip, the carrier is also integrally rotated, and at this time, the grip end body comes in contact with the palm of the worker and supports it. As a result, the internal gear keeps the stopped state because the brake is fixed and the planetary gear revolves around the sun gear while revolving around the sun gear. Is output from the sun gear to the bit via the socket shaft, and the speed-up rotation is enabled.

[0011] Next, when the final tightening work stage is entered due to resistance to the rotation of the screw, the finger is transferred from the finger grip to the hand grip, and the finger is gripped and rotated, so that a normal driver and the driver are engaged. Similarly, the rotational force from the hand grip is transmitted to the socket shaft, and a tightening torque of the force applied by hand itself, which is larger than that in the above-described tightening preparation work, is secured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto. As shown in FIG. 1, the finger grip 1 is fixed to a carrier 4 which is a part of a planetary gear device 3 built in a driver main body 2. The planetary gears 5 arranged and mounted on the carrier 4 mesh with a sun gear 6 located on the central axis of the driver main body 2.

The sun gear 6 is integral with a socket shaft 8 on which a bit 7 is mounted, and the planetary gear 5 meshes with a circumscribed internal gear 9. One end of the internal gear 9 is connected to the connecting body 1.
0 and is fixed to the grip end body 11. Further, the hand grip 12 is fixed to the socket shaft 8 via a fixing plate 13.

In the drawing, reference numeral 31 denotes a planetary gear shaft, 32 denotes a fixing screw for stopping the finger grip 1 and the carrier 4, 3.
3 is a fixing pin for stopping the connecting body 10 and the internal gear 9; 34 is a fixing pin for stopping the hand grip 12 and the fixing plate 13; 35 is a bearing for rotating the socket shaft 8; 36 is a grip end body 11 And a fixing screw for stopping the connection body 10. Further, reference numeral 37 denotes an operator's hand, 3
8 denotes a screw immediately before final tightening, and 39 denotes a screw at the time of final tightening.

Next, the use of the present invention will be described. The bit 7 is aligned with the cross holes of the screws 38 and 39, inserted into the other tap hole, and screwed in while turning the finger grip 1 of the driver body 2 with a fingertip. . At this time, a large tightening torque is not required, and in order to perform the work efficiently, it is necessary to quickly rotate the finger grip 1 given by the fingertip.

By the way, the amount that the finger grip 1 can be turned by one fingertip operation is about 90 degrees (a quarter rotation), though there are some differences such as the size and familiarity of the operator's hand. Therefore, to advance the screw one thread, 4
It requires two fingertip operations. In the case of further tightening the screw with five threads until reaching the tightening, 4 × 5 =
It is necessary to repeat the fingertip operation 20 times.

When the same screw tightening is performed using the quick screwdriver of the present invention, the preparation and operation of the former stage are the same as those of the previous example, but the finger grip 1 is turned 90 degrees (4
When it is rotated by one-half rotation), the planetary gear unit 3 outputs a power of 360 degrees, ie, one rotation, which is quadrupled by the transmission ratio set in advance to the bit 7 of the driver.

[0018] Therefore, 5 before the final tightening work
The number of operations for advancing the mountain screw is completed in 1 × 5 = 5 times. As described above, the difference in the number of operations from the previous example is clear, and since this difference increases in proportion to the number of screws and nuts used for assembling, fatigue of the hand of the operator and a large difference in the working time occur. Results.

When the final tightening operation of the screw has been reached, the hand grip 12 is gripped and turned, and the applied force itself is transmitted to the bit 7.
The same operation and tightening result as a general hand driver can be obtained. Operations requiring adjustment of the screw tightening / removing operation can be similarly performed without causing a difference from the previous feeling.

For this reason, in the present invention, the rotation of the finger grip 1 with a finger is transmitted to the carrier 4 of the planetary gear device 3 in the operation in the low torque rotation region during the tightening preparation operation. The internal gear 9 operates as a planetary planetary gear mechanism in a state in which the planetary gear device 3 fixes the internal gear 9 because the palm of the hand that the operator grips and holds the driver body 2 is in contact with the grip end body 11. The increased rotation is transmitted to the bit 7 attached to the socket shaft 8 via the sun gear 6. In addition, the large tightening torque required at the time of the final tightening work of the screw,
The force of turning the handgrip 12 while holding it with the hand 37 is transmitted directly to the bit 7 via the socket shaft 8.

The transmission ratio of the planetary gear set 3 used in the quick screwdriver of the present invention is suitably 4. That is, the amount of rotation that can rotate the finger grip 1 by one fingertip operation is about 90 degrees, and when the finger grip 1 is rotated 90 degrees, the amount of rotation transmitted to the bit 7 due to the above transmission ratio is 3 degrees.
60 degrees (one rotation). If the transmission ratio is set to less than this, the effect of shortening the operation time is diminished, and if the transmission ratio is set to 4 or more, the force of turning the finger grip with the fingertip also increases, so that the finger is fatigued by continuous screw tightening work, When a load is applied to the screw of the screw or nut, a state where operation with a fingertip is impossible may occur.

Further, according to the present invention, when the outer peripheral surfaces of the finger grip 1 and the hand grip 12 are formed of a material having a large coefficient of friction such as rubber having irregularities, the effect of preventing slippage is further exhibited. By making the material and shape of the grip end body 11 the same as above, it becomes possible to prevent the internal gear 9 of the planetary gear device 3 from rotating together. Internal gear 9
It is preferable that the shape of the connecting body 10 that secures the grip end body 11 to the gripping body 11 is a structure having a narrow width and a plate shape along the outer periphery of the hand grip 12 so as not to hinder the hand gripping the hand grip 12.

[0023]

Thus, according to the present invention, in the tightening preparation work stage, the rotation speed of the screw can be increased by increasing the rotation speed with a small rotational force, and in the final tightening work stage, the applied force itself is a bit. In addition, it is possible to secure the tightening torque without wasting, and to achieve an excellent effect such as performing an extremely efficient screw tightening operation while adopting a usage mode that is the same as a general hand driver.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a quick screwdriver according to the present invention.

FIG. 2 is a sectional view taken along the line AA of the previous figure.

FIG. 3 is a perspective view showing an operation state when performing a screw tightening preparation operation with the quick screwdriver according to the present invention.

FIG. 4 is a perspective view showing an operation state when a screw is finally tightened by the quick screwdriver according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Finger grip 2 ... Driver main body 3 ... Planetary gear device 4 ... Carrier 5 ... Planetary gear 6 ... Sun gear 7 ... Bit 8 ... Socket shaft 9 ... Internal gear 10 ... Connection body 11 ... Grip end body 12 ... Hand grip 13 ... fixed plate 31 ... planetary gear shaft 32 ... fixed screw 33 ... fixed pin 34 ... fixed pin 35 ... bearing 36 ... fixed screw 37 ... operator's hand 38 ... screw immediately before final tightening work 39 ... Screw

Claims (1)

[Claims] 1. A sun gear is fixedly mounted at an upper extension position of a socket shaft on which a bit is mounted, and a plurality of planetary gears circumscribing and meshing with the sun gears are disposed on a carrier. A tooth gear is provided at a predetermined position, and the internal gear is connected to a grip end body provided at an upper end portion of the driver main body via a connecting body to be fixed, and a finger grip is provided on an outer peripheral portion on a bit side of the driver main body. Provided,
A quick driver wherein the finger grip is fixed to the carrier, and a hand grip provided on an outer peripheral portion of the driver body on the grip end body side is attached via a fixing plate so as to be integrated with the socket shaft.