JP2021003734A - Driver bit and screw fastening device - Google Patents

Abstract

To provide a driver bit capable of stably screwing a screw, and a screw fastening device.SOLUTION: A driver bit 10 for screwing a screw 40 includes a columnar bit body part 11 that has a fitting part 15 for being fitted into a head 42 of the screw 40, and a support part 20 that assumes an annular shape surrounding the fitting part 15 and that supports the screw 40. The support part 20 comprises an opposed surface 20A that faces the head 42 of the screw 40. A recess 25, into which the head 42 of the screw 40 is to be fitted, is formed in the opposed surface 20A. The fitting part 15 assumes a shape protruding from a bottom surface 26 of the recess 25.SELECTED DRAWING: Figure 8

Description

The present invention relates to a driver bit and a screw tightening device.

Conventionally, a driver bit described in Patent Document 1 is known. The driver bit described in Patent Document 1 has an engaging portion formed by alternately arranging blade portions and groove portions around an axis so that a portion corresponding to the bottom shape of the groove portion fits into a screw drive hole. It is disclosed that it is configured in.

Japanese Unexamined Patent Publication No. 2000-280181

However, in the configuration disclosed in Patent Document 1, when the screw is screwed with the driver bit, the engaging portion of the driver bit does not fit well into the drive hole (head) of the screw, and the screw staggers or falls. As a result, it may not be possible to screw the screws.

The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a driver bit and a screw tightening device capable of stably screwing screws.

The present invention is a driver bit for screwing a screw, and forms a columnar bit main body portion having a fitting portion that fits on the head of the screw and an annular shape that surrounds the fitting portion. A support portion for supporting is provided, and the support portion is provided with a facing surface facing the head of the screw, and a recess into which the head of the screw is fitted is formed on the facing surface, and the fitting portion is provided. Is characterized in that it has a shape protruding from the bottom surface of the recess.

According to such a driver bit, when screwing a screw, the head of the screw can be fitted to the fitting portion while being supported by the recess of the support portion. Further, since the fitting portion has a shape protruding from the bottom surface of the recess, the driver bit is held while keeping the fitting portion fitted at the center of the screw head (the center of rotation where the screw rotates). It can be rotated to screw the screw. As a result, it is possible to prevent the screw from wobbling or falling when the screw is screwed.

In the above configuration, the recess has an edge portion whose bottom surface in the radial direction rises to the screw side, and when the fitting portion is fitted to the head portion of the screw, the edge portion is said. The support portion can support the screw by abutting on the radial outer side of the head.

According to such a driver bit, when the edge abuts on the radial outer side of the head, the support portion supports the screw, so that the accuracy of the radial inner shape of the screw head varies. Also, the screws can be stabilized and screwed.

In the above configuration, the support portion may be provided with a groove-shaped groove portion that is recessed inward in the radial direction and extends in a direction parallel to the axial direction of the bit body portion.

According to such a driver bit, for example, when the driver bit is housed in the tubular portion, a gap can be provided between the groove portion and the tubular portion. As a result, the screw can be screwed while sucking air through the gap.

In the above configuration, the bit main body portion includes a slope portion having a slope that is inclined inward in the radial direction toward the fitting portion side, and a gap is provided between the slope portion and the support portion. Can be.

According to such a driver bit, the screw can be screwed while sucking air through the gap provided between the slope portion and the support portion.

In the above configuration, the support portion forms an annular shape by providing a through hole penetrating in a direction parallel to the axial direction of the bit body portion on the inner side in the radial direction, and the fitting portion is inserted into the through hole. The bit main body is attached to the bit main body portion in such a manner that the bit main body portion has a rising portion having a wall surface that descends inward in the radial direction at a boundary with the fitting portion, and the rising portion has the penetrating portion. It can be assumed that it is in contact with the edge of the hole.

In general, the driver bit is replaced relatively frequently due to wear or breakage of the fitting portion fitted to the head of the screw. However, according to the driver bit as described above, when the support portion is attached to the bit main body portion, the hole edge of the through hole of the support portion comes into contact with the rising portion, so that only the bit main body portion is replaced. However, it is possible to reduce the error in the height at which the fitting portion of the bit body portion protrudes from the bottom surface of the support portion toward the screw side. As a result, the screws can be screwed in a stable manner.

Further, the present invention is characterized in that the driver bit described above, a tubular tubular portion accommodating the driver bit, and a suction portion for sucking gas from the tubular portion are provided. It is a device.

According to such a screw tightening device, it is possible to provide a practical screw tightening device that stably screwes a screw while sucking air from a tubular portion by a suction portion that sucks air.

According to the present invention, it is possible to provide a driver bit and a screw tightening device capable of stably screwing a screw.

A front view of the screw tightening device according to the embodiment. Cross-sectional view showing the inside of the tubular part seen from the front Cross-sectional view showing the inside of the tubular part when viewed from the side Perspective view of the driver bit viewed from above and from the front left Perspective view of the bit body from below and from the front left Perspective view of the support part viewed from below and from the front left View of the support from below (from the facing side) Sectional view showing the state where the driver bit is fitted to the screw Sectional view showing mounting tools and driver bits

<Embodiment>
Embodiments of the present invention will be described with reference to FIGS. 1 to 9. In the present embodiment, a screw tightening device 100 for screwing a screw into a boss erected on the back surface side (outside the passenger compartment) of a door trim (interior material) attached to a door of an automobile as a vehicle (vehicle) will be described. Each figure will be described with the arrow direction U as upward, the arrow direction D as downward, the arrow direction L as left, the arrow direction R as right, the arrow direction F as forward, and the arrow direction B as backward. Further, as shown in FIG. 8, the screw (screw) 40 used in the present embodiment is screwed to the boss by rotating clockwise. The screw 40 includes a disk-shaped head 42 and a screw portion 41 extending downward from the center of the head 42, and the head 42 protrudes upward from the bulging portion 43 and the bulging portion 43. It is a washer head type including a peripheral portion 44 extending outward in the radial direction.

As shown in FIG. 1, the screw tightening device 100 includes a tubular tubular portion 1 extending in the vertical direction, a drive portion 2 attached to the upper side of the tubular portion 1, and a lower side of the tubular portion 1. A screw supply unit 3 for supplying screws to the holding unit 4 attached to the screw supply unit 4 is provided. Further, the screw tightening device 100 is provided behind the drive unit 2 and is provided above the suction unit 5 for sucking air (gas) from the tubular portion 1 and the control unit 6 which is provided above the drive unit 2 and controls each unit. And.

As shown in FIGS. 2 and 3, a driver bit 10 for screwing the screw 40 supplied to the holding portion 4 to the boss is housed inside the tubular portion 1. The driver bit 10 has a columnar shape elongated in the vertical direction, and a metal such as iron can be used as the material thereof. The driver bit 10 includes a columnar bit main body 11 that occupies most of the bit, and a connecting portion 12 that extends upward from the bit main body 11 and is connected to the driving unit 2.

As shown in FIGS. 1 to 3, the control unit 6 supplies the screws from the screw supply unit 3 to the holding unit 4, and then drives the drive unit 2 to lower the driver bit 10. At this time, the control unit 6 sucks air from the tubular portion 1 by the suction unit 5, and fits the fitting portion 15 of the driver bit 10 to the head 42 of the screw 40 as shown in FIG. Then, the control unit 6 continuously lowers and rotates the driver bit 10 to screw the screw 40 into the boss. After that, the control unit 6 drives the drive unit 2 to raise the driver bit 10. The control unit 6 is provided above the drive unit 2, but the present invention is not limited to this, and the control unit 6 may be provided at various positions.

As shown in FIGS. 4 and 5, in the lower portion 11A of the bit main body portion 11, the bit main body portion 11 has two slope portions 13 and 13 arranged on the left and right sides and 2 arranged on the front and rear sides. The two rising portions 14, 14 and the slope portions 13, 13 and the fitting portion 15 extending downward from the rising portions 14, 14 in a columnar shape are provided.

As shown in FIG. 5, the slope portion 13 arranged on the left side of the lower side portion 11A is in the radial direction (direction perpendicular to the axial direction X indicated by the one-point chain line) toward the lower side (fitting portion 15 side). It includes a slope 13A which is an inwardly inclined surface, and a parallel surface 13C which is connected to the lower end of the slope 13A and forms a plane in a direction (vertical direction) parallel to the axial direction X of the bit body portion 11. The slope 13A has a semi-elliptical shape with a curved upper end and a straight lower end. The parallel surface 13C is a rectangle having a short side in the vertical direction and a long side in the front-back direction. The center of the parallel surface 13C in the front-rear direction is connected to the surface 15A of the fitting portion 15. As described above, the slope portion 13 is reduced in diameter inward in the radial direction by the slope 13A and is connected to the fitting portion 15. The slope portion 13 arranged on the right side of the lower portion 11A has the same configuration.

The rising portion 14 is connected to the front and rear ends of the slope 13A and the parallel surface 13C of the slope portion 13 at the boundary with the fitting portion 15, and has a curved surface 14A which is a surface curved outward in the radial direction and a diameter from the lower end of the curved surface 14A. It is provided with a rising wall surface 14C, which is a wall surface that falls inward in the direction. The rising wall surface 14C has an arc shape. The left and right ends of the rising wall surface 14C are connected to the lower end of the parallel surface 13C of the slope portion 13. The radial inner end of the rising wall surface 14C is connected to the surface 15A of the fitting portion 15. As described above, the rising portion 14 is reduced in diameter by the height of the rising wall surface 14C (length in the radial direction) and inward in the radial direction, and is connected to the fitting portion 15. It can be said that the curved surface 14A of the rising portion 14 and the surface 15A of the fitting portion 15 have a step corresponding to the height of the rising wall surface 14C.

The lower portion 11A of the bit main body portion 11 is connected to the fitting portion 15 by reducing the diameter inward in the radial direction by the slope portions 13, 13 and the rising portions 14, 14. As shown in FIGS. 2 to 5, the distance between the two parallel surfaces 13C and 13C arranged on the left and right sides of the lower portion 11A is equal to the diameter of the fitting portion 15, and the through hole of the support portion 20 described later The distance between the two curved surfaces 14A and 14A arranged on the front and rear sides of the lower portion 11A, which is smaller than the diameter of 21, is larger than the diameter of the through hole 21 of the support portion 20.

As shown in FIGS. 2 to 4 and 8, the driver bit 10 has a columnar shape and an annular shape (cylindrical shape) in the vertical direction so as to surround the periphery of the fitting portion 15, and the fitting portion 15 has a screw 40. A support portion 20 that supports the head 42 when fitted to the head 42 is provided. The support portion 20 forms an annular shape by providing a through hole 21 penetrating in the vertical direction on the inner side in the radial direction. The through hole 21 is composed of a columnar space whose height direction is the vertical direction. The support portion 20 is attached to the bit main body portion 11 by the enamel set 30 in a state where the fitting portion 15 is inserted through the through hole 21 and a gap S is provided radially outward with respect to the fitting portion 15. ing.

In the state where the support portion 20 is attached to the bit main body portion 11, the rising wall surface 14C (see FIG. 5) of the rising portion 14 comes into contact with the hole edge 21B of the through hole 21 in the upper end portion 20B of the supporting portion 20, and there is a gap. It is blocking S. On the other hand, the center of the parallel surface 13C of the slope portion 13 in the front-rear direction does not abut on the hole edge 21B, and there is an opening between the slope portion 13 and the upper end portion 20B of the support portion 20. The gap S communicates downward between the slope portion 13 and the support portion 20 up to the lower end portion (tip portion) 16 of the fitting portion 15.

As shown in FIGS. 4 to 8, the support portion 20 has four groove-shaped groove portions 22, a hole 23 through which the enamel set 30 is inserted, and a protrusion 51 (see FIG. 9) of the mounting tool 50 described later. It comprises two openings 24 for receiving. The four groove portions 22 are recessed at right angles inward in the radial direction from the outer peripheral side of the support portion 20, and extend in the vertical direction in the support portion 20. The groove portion 22 is provided in the support portion 20 one by one on the right front side, the right back side, the left front side, and the left back side, and is provided with a gap at a predetermined interval from the tubular portion 1.

As shown in FIG. 9, the connecting portion 12 of the driver bit 10 can be connected to the driving portion 2 by rotating the support portion 20 using the mounting tool 50 (see FIGS. 1 and 3). The mounting tool 50 is a columnar body having a thickness that can be inserted into the tubular portion 1. The mounting tool 50 includes a recessed portion 52 having a concave shape at the upper end portion, and two protruding portions 51 protruding upward on the radial outer side of the recessed portion 52. When the upper end portion of the mounting tool 50 is inserted into the tubular portion 1 and the protrusion 51 is fitted into the opening 24 of the support portion 20, the support portion 20 can be rotated. At this time, the tip portion 16 of the fitting portion 15 of the bit body portion 11 is accommodated in the recessed portion 52 of the mounting tool 50.

As shown in FIGS. 6 to 8, the support portion 20 includes a facing surface 20A facing downward at the lower end portion. The facing surface 20A is a surface facing the head 42 of the screw 40. The facing surface 20A is formed with a recess 25 having a concave shape upward and into which the head 42 of the screw 40 is fitted. The recess 25 includes an annular bottom surface 26 surrounding the through hole 21 and an edge portion 27 in which the radial outer side of the bottom surface 26 rises vertically to the lower side (screw 40 side). A total of four edge portions 27 are provided on the left-right side and one on the front-rear side with respect to the bottom surface 26. A groove 22 is provided between the adjacent edges 27.

As shown in FIGS. 2, 3 and 8, the tip portion 16 of the fitting portion 15 projects downward from the bottom surface 26 of the recess 25 and has a diameter reduced inward in the radial direction. The tip portion 16 can be fitted into a groove provided in the bulging portion 43 of the head 42 of the screw 40. As shown in FIG. 8, when the tip portion 16 is fitted in the groove of the bulging portion 43 (the fitting portion 15 is fitted in the head 42 of the screw 40), the edge of the support portion 20 in the recess 25 is The portion 27 abuts on the peripheral portion 44 extending radially outward from the bulging portion 43 at the head portion 42 of the screw 40. At this time, the bottom surface 26 of the recess 25 does not contact the bulging portion 43 of the head 42, and a gap is provided.

Subsequently, the effect of this embodiment will be described. In the present embodiment, the driver bit 10 for screwing the screw 40 is a columnar bit main body 11 having a fitting portion 15 that fits on the head 42 of the screw 40, and an annular shape that surrounds the fitting portion 15. The support portion 20 is provided with a support portion 20 for supporting the screw 40, and the support portion 20 is provided with a facing surface 20A facing the head 42 of the screw 40, and the head 42 of the screw 40 is fitted in the facing surface 20A. It was shown that the recess 25 to be fitted was formed, and the fitting portion 15 had a shape protruding from the bottom surface 26 of the recess 25.

According to such a driver bit 10, when screwing the screw 40, the head 42 of the screw 40 can be fitted to the fitting portion 15 while being supported by the recess 25 of the supporting portion 20. Further, since the fitting portion 15 has a shape protruding from the bottom surface 26 of the recess 25, the fitting portion 15 is fitted to the center of the head 42 of the screw 40 (the center of rotation in which the screw 40 rotates). The screw 40 can be screwed by rotating the driver bit 10 while maintaining the above. As a result, it is possible to prevent the screw 40 from wobbling or falling when the screw 40 is screwed.

Further, in the present embodiment, the recess 25 is provided with an edge portion 27 whose bottom surface 26 is radially outwardly raised toward the screw 40 side, and the concave portion 25 has an edge when the fitting portion 15 is fitted to the head portion 42 of the screw 40. The support portion 20 supports the screw 40 when the portion 27 abuts on the radial outer side of the head portion 42.

According to such a driver bit 10, the support portion 20 supports the screw 40 by abutting the edge portion 27 on the radial outer side of the head portion 42, so that the shape of the head portion 42 of the screw 40 is formed in the radial direction. Even if the accuracy varies, the screw 40 can be stably screwed.

Further, in the present embodiment, the support portion 20 includes a groove-shaped groove portion 22 that is recessed inward in the radial direction and extends in a direction parallel to the axial direction X of the bit body portion 11.

According to such a driver bit 10, a gap can be provided between the groove portion 22 and the tubular portion 1 by accommodating the driver bit 10 in the tubular portion 1. As a result, the screw 40 can be screwed while sucking air through the gap.

Further, in the present embodiment, the bit body portion 11 includes a slope portion 13 having a slope 13A inclined inward in the radial direction toward the fitting portion 15, and between the slope portion 13 and the support portion 20. A gap S is provided.

According to such a driver bit 10, the screw 40 can be screwed while sucking air through the gap S provided between the slope portion 13 and the support portion 20.

Further, in the present embodiment, the support portion 20 is formed in an annular shape by providing a through hole 21 penetrating in a direction parallel to the axial direction X of the bit body portion 11 on the inner side in the radial direction, and the through hole 21 is formed. The bit main body 11 is attached to the bit main body 11 through which the fitting portion 15 is inserted, and the bit main body 11 has a rising wall surface 14C that falls inward in the radial direction at the boundary with the fitting portion 15. The rising wall surface 14C of the rising portion 14 is in contact with the hole edge 21B of the through hole 21.

Generally, the driver bit 10 is replaced relatively frequently because the fitting portion 15 fitted to the head 42 of the screw 40 is worn or damaged. However, according to the driver bit 10 as described above, when the support portion 20 is attached to the bit main body portion 11, the hole edge 21B of the through hole 21 of the support portion 20 comes into contact with the rising wall surface 14C of the rising portion 14. Even when only the bit body portion 11 is replaced, the error in the height at which the fitting portion 15 of the bit body portion 11 protrudes from the bottom surface 26 of the support portion 20 toward the screw 40 side can be reduced. As a result, the screw 40 can be screwed stably.

Further, the present embodiment is characterized by including the driver bit 10 described above, a tubular tubular portion 1 accommodating the driver bit 10, and a suction portion 5 for sucking gas from the tubular portion 1. The screw tightening device 100 is shown.

According to such a screw tightening device 100, it is possible to provide a practical screw tightening device 100 in which the screw 40 is stably screwed while sucking air from the tubular portion 1 by the suction portion 5 that sucks air. it can.

<Other embodiments>
The present invention is not limited to the embodiments described by the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not deviating from the gist other than the following. It can be implemented with various changes.

(1) In addition to the above embodiment, the shape of the screw can be changed as appropriate. In the above embodiment, the screw is a washer head type, but the screw is not limited to this. For example, the screw can adopt various shapes such as a head type, a truss type, a countersunk type, and a pan type.

(2) In the above embodiment, the screw tightening device is intended to screw a screw into a boss erected on the back surface side of a door trim attached to an automobile door, but the present invention is not limited to this. For example, an instrument panel, a cowl side trim, or the like may be used as the interior material. Further, the structure for screwing the screws is not limited to the boss, and may be screwed into the holes of other members such as the substrate and the speaker grill, and the screws may be screwed on the back surface side of the interior material. Just do it.

(3) In the above embodiment, the support portion has an annular shape (a shape having a circular cross section in the radial direction) surrounding the fitting portion, but the support portion is not limited to this. For example, the support portion may have an annular shape surrounding the fitting portion and a shape having a square radial cross section or a polygonal shape in the radial cross section.

(4) The driver bit and the screw tightening device illustrated in the above embodiment are not limited to those provided for vehicles, and may be provided in various vehicles. For example, the above driver bit and screw tightening device may be applied to trains and amusement vehicles as ground vehicles, airplanes and helicopters as flight vehicles, and ships and submersibles as marine and underwater vehicles. it can.

1 ... Cylindrical part, 5 ... Suction part, 10 ... Driver bit, 11 ... Bit body part, 13 ... Slope part, 14 ... Rising bottom, 15 ... Fitting part, 20 ... Support part, 20A ... Facing surface, 21 ... Through hole, 21B ... hole edge, 22 ... groove, 25 ... recess, 26 ... bottom surface, 27 ... edge, 40 ... screw, 42 ... head, 100 ... screw tightening device

Claims (6)

A driver bit for screwing screws
A columnar bit body having a fitting portion that fits into the head of the screw,
A support portion that forms an annular shape surrounding the fitting portion and supports the screw is provided.
The support portion is provided with a facing surface facing the head of the screw, and a recess into which the head of the screw is fitted is formed on the facing surface.
The fitting portion is a driver bit having a shape protruding from the bottom surface of the recess. The recess has an edge portion whose bottom surface radially outwards rises to the screw side.
A claim characterized in that, in a state where the fitting portion is fitted to the head of the screw, the support portion supports the screw by abutting the edge portion on the radial outer side of the head. Item 1. The driver bit according to item 1. The first or second aspect of the present invention, wherein the support portion is provided with a groove-shaped groove portion that is recessed inward in the radial direction and extends in a direction parallel to the axial direction of the bit body portion. Driver bit. The bit body portion includes a slope portion having a slope that is inclined inward in the radial direction toward the fitting portion side.
The driver bit according to any one of claims 1 to 3, wherein a gap is provided between the slope portion and the support portion. The support portion has an annular shape by providing a through hole penetrating in a direction parallel to the axial direction of the bit body portion on the inner side in the radial direction, and the fitting portion is inserted into the through hole. It is attached to the bit body and
The bit body portion includes a rising portion having a wall surface that descends inward in the radial direction at a boundary with the fitting portion.
The driver bit according to any one of claims 1 to 4, wherein the rising portion is in contact with the edge of the through hole. The driver bit according to any one of claims 1 to 5.
A tubular tubular portion that accommodates the driver bit and
A screw tightening device including a suction portion for sucking gas from the tubular portion.

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