JP3055664U - Driver with adjustable torque - Google Patents

Abstract

(57) [Summary] [Problem] The optimum torque can be freely selected by a scale according to a used part, and the torque adjustment is locked.
Thus, all of the strong rotational force of the rotary gripping shaft can be applied as the forward and reverse rotational force of the bit. SOLUTION: One end of a bit gripping shaft 1 and a transmission shaft 15 forming a collet chuck for attaching and detaching the bit 2 by being mounted on a substantially straight line is closely fitted to the bit gripping shaft 1, and a meshing tooth 16 is provided at the other end. The gear 14 with a transmission shaft is provided. A hollow hexagonal cross section in which a hexagonal slider-equipped gear 19 engraved with a meshing tooth 21 meshing with the meshing tooth 16 slides, and the restraining surface 1
The rotary gripping shaft 10 has a built-in meshing chamber 12 formed with a gear 3 and a pressing spring 23 for pressing a back surface 24 of a gear 19 with a hexagonal slider.
To form An adjusting screw engraved on the outer peripheral surface with a torque adjusting male screw 9 screwed with a torque adjusting female screw 11 engraved on the inner surface of the rotary gripping shaft 10 and a torque adjusting scale 29 for reading the advance / retreat dimension of the rotary gripping shaft 10. 8 is provided.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a torque-adjustable driver, and more particularly, to a torque-adjustable driver mainly used for tightening or loosening precision machine screws such as precision equipment, electronic equipment, eyeglass screws, and the like. Things.

[0002]

[Prior art]

 Conventionally, with a screwdriver used for tightening or loosening screws, the torque transmission force has been adjusted by adjusting the meshing force of the connecting meshing teeth of the gripping shaft that rotates the driver and the chuck shaft for mounting the bit with spring pressure, etc. Torque drivers have been known in the art to prevent device damage by making the torque of the gripping shaft idle by weakly adjusting the torque.

[0003]

[Problems to be solved by the invention]

 The conventional torque driver has a configuration that can prevent the equipment from being damaged by idling when a strong rotational force is applied to the gripping shaft, but precision equipment, electronic equipment, computers, cameras, audio, watches, mechanical models , Radio control, plastic hobby, glasses, etc., the tightening torque varies greatly depending on the material used, the thickness of the board, the frequency of impact, etc. It is not possible to select the optimal torque, and there is a danger of damage to the equipment. There was a problem that a strong torque could not be obtained when tightening a screw or when a strong tightening force was required.

[0004] In view of the above problems, the present invention can freely select and determine the optimal torque according to the parts to be used on a scale, and can also rotate and hold the shaft and the chuck shaft of the bit as necessary. The purpose of the present invention is to provide a driver capable of adjusting the torque that can securely transmit the strong torque to the bit side while securely locking the connection portion with the motor.

[0005]

[Means for Solving the Problems]

 A bit gripping shaft forming a collet chuck for attaching and detaching the bit mounted substantially on a straight line, a transmission shaft gear having one end of the transmission shaft closely fitted to the bit gripping shaft, and having a meshing tooth provided at the other end; A meshing chamber having a hollow hexagonal cross section in which a gear with a hexagonal slider engraved with a meshing tooth engaged with the meshing tooth and having a restraining surface, and a pressing spring for pressing the back of the gear with a hexagonal slider. , A torque adjusting male screw screwed into a torque adjusting female screw engraved on the inner surface of the rotating gripping shaft, and a torque adjustment for reading an advance / retreat dimension of the rotating gripping shaft. It consists of a substantially cylindrical adjustment screw with a scale engraved on the outer peripheral surface.

[0006]

[Embodiment of the invention]

 The present invention will be described below with reference to the drawings. In FIGS. 1 to 3, a bit gripping shaft (commonly called a box) 1 is formed by partially drilling an insertion hole 3 for a bit 2 in a part of a shaft core portion. The thickness of the periphery is reduced, and a cut groove is formed, for example, at two places in the longitudinal direction from the end face, and the hole diameter of the insertion hole 3 is formed so as to be expandable. Form. The box cover 5 is formed into a cylindrical shape by bending the front end side inward so as to press the gripping portion 4 from the outside and providing an opening / closing pressing port 6, and forming the rear end side inner surface on the bit gripping shaft 1 in the longitudinal direction. When the box cover 5 is rotated by a fingertip, the box cover 5 moves in the longitudinal direction of the bit gripping shaft 1 (up and down direction in FIG. 1), and the opening / closing pressing port 6 is gripped. The collet chuck is configured such that the bit 2 can be inserted and removed by pressing or opening the holding portion 4 from the outside.

The adjusting screw 8 is formed of a large-diameter portion and a small-diameter portion, and is formed in a cylindrical shape having a hollow inside with a hollow inside, and the large-diameter side drills the insertion hole 3 of the bit gripping shaft 1. A torque adjusting male screw 9 is formed on the outer peripheral surface of the other end. The rotary gripping shaft 10 is formed in a substantially cylindrical shape, and a torque adjusting female screw 11 screwed with the torque adjusting male screw 9 is engraved on the inner peripheral surface at one end, and the torque adjusting male screw 9 is screwed. When the rotary gripping shaft 10 is rotated with the adjustment screw 8 fixed, the rotary gripping shaft 10 is mounted so as to advance and retreat in the longitudinal direction (vertical direction in FIG. 1).

The meshing chamber 12 is formed in a hollow chamber having a hexagonal cross section by increasing the hollow diameter of the rotary gripping shaft 10 inward (upward in FIG. 1) from the torque adjusting female screw 11. On the end face opposite to 11, an inhibiting surface 13 for inhibiting the rear surface of a gear with a hexagonal slider described later is formed. The gear 14 with a transmission shaft includes a transmission shaft 15 and a substantially triangular meshing tooth 16 formed at one end of the transmission shaft 15 with the tooth tip directed in the longitudinal direction of the transmission shaft 15 in a circular shape. The transmission shaft 15 is loosely fitted in the hollow inner surface 18 in the adjusting screw 8, and the bite groove 17 is tightly fitted and fixed to the bit gripping shaft 1, and the meshing tooth is formed. 16 is mounted so as to rotate in the meshing chamber 12.

The gear 19 with a hexagonal slider has a slider 20 formed in a hexagonal shape large enough to be slidable in the longitudinal direction on the inner surface of the hexagonal cross section of the meshing chamber 12, and the meshing teeth on one side of the slider 20. The gear 19 is formed by a substantially triangular meshing tooth 21 that meshes with the gear 16, and the gear 19 with a hexagonal slider is mounted so that the meshing tooth 21 meshes with the meshing tooth 16 by being constantly pressed by a pressing spring described later. The press spring loose fitting room 22 is formed by a hollow cylindrical portion of the rotary gripping shaft 10, and is bored in a hollow shape in a longitudinal direction inward from an end face opposite to the torque adjusting female screw 11. The pressing spring 23 is loosely fitted in the pressing spring loose fitting chamber 22 in the longitudinal direction, one end of the pressing spring 23 constantly presses the back surface 24 of the slider 20, and the other end thereof is located outside the pressing spring loose fitting chamber 22. Abuts on the end surface 25.

The speeder 26 is formed in a substantially columnar shape, a rotation center shaft 27 is protruded at a center position, a tip end of the rotation center shaft 27 is inserted into the end face 25, and a snap ring 28 is attached to the tip end. It is fitted so that the rotary gripping shaft 10 can rotate around the rotation central shaft 27. The torque adjustment scale 29 is engraved on the outer peripheral surface of the small-diameter portion of the adjustment screw 8. More specifically, the closer to the large-diameter end surface 30 of the adjustment screw 8, the higher the torque value. When the scale of LOCK is engraved at a close position, the rotary gripping shaft 10 is rotated to the LOCK scale, and when the scale reading end face 31 on the engraving side of the torque adjusting female screw 11 of the rotary gripping shaft 10 reaches, The position where the restraining surface 13 contacts the back surface 24 of the slider 20 and the meshing teeth 16 and the meshing teeth 21 are securely meshed and do not slide and rotate is defined as a LOCK scale position.

[0011]

[Action]

 To adjust the torque, as shown in FIG. 3, for example, by holding the adjustment screw 8 with two fingertips of the left hand and fixing it, and rotating the rotary gripping shaft 10 with the right hand, the torque of the rotary gripping shaft 10 is adjusted. The female screw 11 is screwed with the torque adjusting male screw 9 of the adjusting screw 8 so that the rotary grip shaft 10 advances and retreats in the longitudinal direction. For example, the rotary grip shaft rotates in a direction in which the scale reading end face 31 advances toward the end face 30 side. When the rotary shaft 10 is rotated, the pressing spring 23 is compressed, and the meshing teeth 21 are strongly meshed with the meshing teeth 16. At the same time, the scale reading end face 31 also advances on the torque adjustment scale 29 to advance to the larger torque value. Since the torque value is specified, a preset torque value can be set by stopping the rotation at the position of the optimum torque value.

When a stronger torque is required, the rotary gripping shaft 10 is further rotated to advance the scale reading end face 31 toward the end face 30 to match the LOCK of the torque adjustment scale 29. When the pressing spring 23 is compressed, the restraining surface 13 comes into contact with the rear surface 24 of the slider 20 and presses the meshing tooth 21 against the meshing tooth 16. When a strong rotating force is applied to the holding shaft 10, it can be transmitted to the bit gripping shaft 1 via the transmission shaft 15 without any trouble in the reverse rotation, and when the tightened screw is loosened. Is also convenient.

The bit 2 can be replaced by opening and closing the gripping portion 4 by rotating the box cover. When using the speeder 26, the indexer's finger presses the head of the speeder 26 to hold the bit and the thumb. Speedy work can be expected if the work is performed while the rotary gripping shaft 10 is turned upright in the vertical direction with the middle finger.

[0014]

[Effect of the invention]

 As described above, when the present invention is implemented, it is possible to easily select and use an appropriate torque value according to the use conditions, so that there is no fear that the tightening force is too strong and the parts are damaged. Also, a torque capable of strong forward and reverse rotation in the LOCK state can be obtained, and a remarkable improvement in work efficiency can be expected.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a torque adjustable driver.

FIG. 2 is a front view of a torque adjustable driver and a partially enlarged view thereof.

FIG. 3 is a diagram illustrating a usage mode during torque adjustment.

[Description of Signs] 1 bit gripping shaft 2 bit 4 gripping part 5 box cover 7 screw 8 adjusting screw 9 torque adjusting male screw 10 rotating gripping shaft 11 torque adjusting female screw 12 engagement chamber 13 restraining surface 14 gear with transmission shaft 15 Transmission shaft 16 Mesh teeth 19 Gear with hexagonal slider 20 Slider 21 Mesh teeth 22 Push spring loose fitting room 23 Push spring 29 Torque adjustment scale 31 Scale reading end face

Claims (1)

[Utility model registration claims] 1. A bit gripping shaft 1 formed with a collet chuck for attaching and detaching a bit 2 mounted on a substantially straight line, one end of a transmission shaft 15 is closely fitted to the bit gripping shaft 1, and a meshing tooth 16 is provided at the other end. Gear 14 with a transmission shaft provided with
6 is a hollow hexagonal cross section in which a gear 19 with a hexagonal slider engraved with a meshing tooth 21 meshing with the sliding surface 6 is provided.
, A substantially cylindrical rotary gripping shaft 10 having a built-in meshing chamber 12 and a pressing spring 23 for pressing a back surface 24 of a gear 19 with a hexagonal slider, and a torque adjustment carved on the inner surface of the rotary gripping shaft 10. Torque adjustment scale 2 for reading the torque adjustment male screw 9 screwed with the female screw 11 and the advance / retreat dimension of the rotary gripping shaft 10
A screwdriver 9 capable of adjusting the torque, comprising an adjustment screw 8 having a substantially different diameter and being formed on the outer peripheral surface thereof.