JPH0752055A - Driver - Google Patents

Abstract

PURPOSE:To prevent a mounting face from being injured when a special screw having a screw groove on the end face of a polygonal screw head by putting a cylindrical body in the condition of being pressed against the mounting face so as not to contactedly rotate at contacting the extreme end of the cylindrical body with the mounting face. CONSTITUTION:When the screw head part 3 of a screw 1 is fitted in the nut bit part 22 of the cylindrical body 13 of a driver bit 11, the extreme end of a male screw part 2 is brought in contact with the fitting hole 7 of a mounting face 6, and the driver main body is rotated, a shaft body 12 and the cylindrical body 13 fitted to this are rotated, and the male screw part 2 is screwed in. By this screw-in, the extreme end of the cylindrical body 13 is brought into contact with the mounting face 6, in addition when torque is applied on the shaft body 12 while pressing the driver main body against a spring 27, the screw head part 2 is detached from the nut bit part 22, the shaft body 12 is moved on the face 6 side, the fitted part of the shaft body 12 is detached, then a screw bit part 16 is engaged with the screw groove of the screw head part 3, and the cylindrical body 13 is not rotated and the shaft body 12 is only rotated so as to thread-mount the screw 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screwdriver capable of screwing a nut and a screw having a thread groove.

[0002]

2. Description of the Related Art Conventionally, as this type of driver, for example, the structure described in Japanese Utility Model Laid-Open No. 60-31974 is known.

The driver described in Japanese Utility Model Laid-Open No. 60-31974 is composed of a shaft body and a cylinder body.
For example, a positive screw bit portion that can be fitted in, for example, a cross-shaped screw groove formed in the screw head portion is provided at the tip, and an attachment portion that is connected to the driver body is provided at the rear end. Further, the tubular body is a tubular shape having a nut bit portion into which the bolt head portion of the bolt can be fitted, and the mounting portion of the shaft body is exposed to allow the screw bit portion to move back and forth to fit the shaft body. ing. Further, a fixing projection is provided on the shaft body, one end of the coil spring is brought into contact with the fixing projection, and the other end is brought into contact with the rear end surface of the tubular body, so that the screw bit portion is always housed in the tubular body. There is.

Further, the cylindrical body has a through groove extending along the axial direction, and the U-shaped groove is formed at both ends in the longitudinal direction of the through groove. Further, the shaft body is provided with a protrusion that slidably inserts into the through groove of the cylindrical body so that the shaft body does not separate from the cylindrical body.

When the bolt is screwed into a female screw formed in the mounting surface, the mounting portion of the shaft body is connected to the driver body, and the cylindrical body is screwed by the urging force of the coil spring. Slide it to the bit part side, position the shaft protrusion in the groove on the rear end side of the through hole of the cylinder, fit the nut bit part to the bolt head, and screw the screwdriver body by rotating. .

In addition, when the positive screw is screwed in,
Slide the cylinder against the mounting part at the rear end of the shaft against the biasing force of the coil spring, position the protrusion of the shaft in the groove on the tip side of the through groove of the cylinder, and screw the bit part to the nut. Project from the bit part, fit the screw bit part into the thread groove of the screw head, and screw in by rotating the driver body.

[0007]

However, when the bolt and the screw are screwed, the projection of the shaft body is re-engaged with the groove of the cylindrical body to select the nut bit portion and the screw bit portion. It must be done and the work is complicated.

When the bolt is screwed, the tip of the cylinder may come into contact with the mounting surface for mounting the nut before the bolt is screwed. In this case, if the driver body is further rotated for screwing the nut, the mounting surface may be damaged at the tip of the tubular body. Further, when the nut is screwed deeper than the mounting surface, there is a problem that the bolt head part comes off from the nut bit portion before the nut is screwed, and the nut cannot be screwed.

In view of the above problems, it is an object of the present invention to provide a driver that can be screwed easily and securely.

[0010]

The driver of the present invention is
A screw bit portion that is engageable with a screw groove formed on the end face of the polygonal screw head and that is formed at the tip, a fitting portion that is formed on the base end side of this screw bit portion, and this A shaft body having a columnar portion formed on the base end side of the fitting portion, a nut bit portion coaxial with the screw bit portion and capable of fitting the screw head portion, and fitted to the fitting portion A tubular body having a fitting recessed portion that is attached so as to be movable back and forth along the axial direction of the shaft body; and the screw bit portion provided between the shaft body and the tubular body in the cylinder body. A spring for urging in a housing direction, and when the spring is urged, the screw bit portion is housed in the cylindrical body, and the fitting recess is fitted in the fitting portion, so The cylinder is rotated so that the cylinder does not move against the bias of the spring. And said fitting recess is positioned in the cylindrical portion when being pushed to the end direction, is intended to idle the cylindrical body relative to the shaft body.

[0011]

In the screwdriver of the present invention, when a special screw having a thread groove is attached to the end face of the polygonal screw head, the nut bit portion of the cylinder is fitted around the polygon of the screw head. Together, the spring is biased to fit the fitting recess of the cylinder into the fitting portion of the shaft, and the cylinder is rotated based on the rotation of the shaft,
Tighten the screws. Further, when the screw is screwed and the tip of the cylinder comes into contact with the mounting surface, the cylinder is pressed against the base end side of the shaft body against the biasing force of the spring, and the fitting recess of the cylinder body The fitting is released from the fitting portion so that the fitting concave portion is located around the cylindrical portion, the screw bit portion is engaged with the screw groove, and the shaft rotates to embed the screw in the mounting surface. At this time, since the cylinder rotates idly with respect to the rotation of the shaft, the cylinder does not come into contact with the mounting surface in a pressed state, and the mounting surface is not damaged. Further, since the tubular body can move back and forth with respect to the shaft body, it can be applied to screws, bolts and nuts having only general thread grooves.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A driver bit showing an embodiment of a driver of the present invention will be described below with reference to the drawings.

In FIG. 4, reference numeral 1 denotes a screw, and this screw 1
Is composed of a male screw portion 2 formed in a wood screw shape and a screw head 3 formed in a hexagonal shape, for example, and a cross-shaped screw groove 4 is formed on an end surface of the screw head 3.

Further, in FIGS. 1 and 2, reference numeral 6 designates a mounting surface, on which a substantially circular mounting hole 7 having a diameter slightly larger than the maximum diameter of the screw head 3 of the screw 1 is provided. The tenon is formed deeper than the axial thickness of the screw head 3.

On the other hand, in FIG. 1, 11 is a driver bit, and this driver bit 11 is composed of a shaft body 12 and a cylinder body 13.

The shaft body 12 is formed in the shape of a metal rod, and one end of a body portion 15 which is a cylindrical columnar portion is engageable with the thread groove 4 of the screw head 3 and has, for example, a cross-shaped screw. A bit portion 16 is formed, and a mounting portion 17 having a diameter larger than that of a body portion 15 connected to a driver body (not shown) is formed at the other end. Furthermore, at the base end of the screw bit part 16,
A hexagonal columnar fitting portion 18 having a larger diameter than the body portion 15 is formed in the same shape as the mounting portion 17. In addition, an annular fixing portion 19 is fixed to the body portion 15 side of the mounting portion 17 with a potato screw 20.

On the other hand, the tubular body 13 is formed into a metallic tubular shape, and has a nut bit portion 22 having six faces coaxially facing each other at one end.
Is formed so that the screw head 3 of the screw 1 can be fitted therein.
An annular portion 23, which is a fitting recess protruding inward in the shape of a wall, is formed substantially at the center of the inner circumference of the cylindrical body 13 so that the inner diameter is small. Further, the inner peripheral surface of the annular portion 23, like the nut bit portion 22, has six surfaces concentrically facing each other, and
Twelve fitting portions 18 are formed so that they can be fitted. The annular portion 23 defines a bit storage chamber 24 on the side of the nut bit portion 22 at one end and a spring chamber 25 on the other end side.

In the shaft body 12, the fitting portion 18 is fitted in the annular portion 23 of the cylindrical body 13, the screw bit portion 16 is located in the bit accommodating chamber 24, and the cylindrical body 13 is fitted. There is. Further, the coil spring 27, the end surface of the annular portion 23 on the spring chamber 25 side,
Between the end faces of the fixed portion 19 fixed to the shaft body 12, it is positioned inside the spring chamber 25 of the cylindrical body 13 and wound around the shaft body 12. The tubular body 13 is always held by the shaft body 12 while the screw bit portion 16 is positioned in the bit storage chamber 24 by the bias of the coil spring 27. Also, this coil spring 27
When the tubular body 13 is moved toward the mounting portion 17 side of the shaft body 12 against the urging force of the shaft body 12, the nut bit portion 22 of the tubular body 13 to the screw bit portion 16
Is advanced, the fitting portion 18 of the shaft body 12 fits into the annular portion 23 of the cylinder body 13 and the fitting portion 18 of the shaft body 12 is disengaged, so that the shaft body 12 and the cylinder body
13 and 13 are designed to rotate.

Next, the mounting operation of the screw of the above embodiment will be described.

First, a shaft body 12 is attached to a driver body (not shown).
Connect the mounting part 17 of and install the driver bit 11.
Next, the screw head 3 of the screw 1 is fitted into the nut bit portion 22 of the cylindrical body 13 of the driver bit 11. And screw 1
Attached surface 6 in which the tip of the male screw portion 2 of
The driver body is slightly pressed against the mounting surface 6 side, and the shaft body 12 and the cylindrical body 13 fitted to the shaft body 12 are rotated by the rotational force of the driver body. Then, the male screw part 2 is screwed in.

Due to this screwing, the tip of the cylindrical body 13 comes into contact with the mounting surface 6. Furthermore, while the driver body is slightly pressed against the bias of the coil spring 27, the rotational force is applied to the shaft body.
When it is hung on 12, the screw head 2 is disengaged from the nut bit part 22, and the screw bit part 16 of the shaft body 12 in the bit accommodating part 24 of the tubular body 13 is advanced so that the nut bit part 22 advances.
12 moves to the mounted surface 6 side, and the fitting portion 18 of the shaft body 12 fitted into the annular portion 23 of the tubular body 13 is disengaged. By the movement of the shaft body 12, the screw bit portion 16 engages with the screw groove 4 of the screw head 3, the cylinder body 13 does not rotate, only the shaft body 12 rotates, and the screw 1
The shaft body 12 is further screwed while being advanced by the rotating shaft body 12, and the screw head 3 is positioned in the mounting hole 7 and screwed.

Therefore, even when the screw head 3 is screwed into the mounting hole 7 located in the mounting hole 7 of the mounting surface 6, the nut bit portion 22 and the screw bit portion 16 are selected as in the conventional case. However, it is not necessary to perform a switching operation, and the screw can be screwed by simply rotating the shaft body 12 while slightly pressing the driver body, and the screw can be efficiently and easily screwed.

Further, the cylindrical body 13 abuts on the mounting surface 6 and the shaft body
Since the fitting between 12 and the cylindrical body 13 is released and only the shaft body 12 rotates, it is possible to reduce the damage to the mounted surface 6 by the tip end of the cylindrical body 13 that abuts the mounted surface 6.

In the above embodiment, the wood screw-shaped screw 1 having the hexagonal screw head 3 is used for description, but in the case of a screw having no thread groove 4, the nut bit portion 22 is used. The screw head 3 is fitted to the screw and is directly screwed to the female screw portion provided on the mounting surface 6, or when the screw head 3 is circular and has the screw groove 4 like a wood screw, the nut bit portion is used. It is also possible to insert the screw head 3 into 22 and engage the screw bit portion 16 with the screw groove 4 for screwing.

Further, the thread groove 4 is not limited to a cross shape, but may be a single letter shape or a hexagonal hole shape. In these cases, the screw bit part 16 of the shaft body 12 having a tip formed in a single plate shape or a hexagonal column shape is used.

As the driver body, one that is driven to rotate by electric power and screwed, such as an electric drill, or one that has a cylindrical grip shape and is manually screwed by applying a rotational force. But it's okay.

Further, the biasing force of the coil spring 27 can be varied by loosening the potato screw 20 and moving the fixed portion 19 back and forth.

[0028]

According to the driver of the present invention, when a special screw having a thread groove is screwed onto the end face of the polygonal screw head, when the tip of the cylinder comes into contact with the mounting surface, the cylinder body Since the shaft rotates idly with respect to the rotation of the shaft body, the cylindrical body does not rotate in contact with the surface to be attached while being pressed, so that the surface to be attached can be prevented from being damaged. Also, since the cylinder can move back and forth with respect to the shaft, it is not necessary to select and switch the nut bit part and the screw bit part. It rarely occurs and can be easily and securely screwed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a driver bit of the present invention.

FIG. 2 is a cross-sectional view showing a screwed state of the same screw.

FIG. 3 is a front view of the same driver body.

FIG. 4 is a partially cutaway perspective view showing the same screw.

[Explanation of symbols]

 3 Screw head 4 Screw groove 11 Driver bit 12 Shaft body 13 Cylindrical body 15 Body part as a cylinder part 16 Screw bit part 18 Fitting part 22 Nut bit part 23 Annular part as fitting recessed part 27 Coil spring

Claims (1)

[Claims] 1. A screw bit portion formed at a tip end capable of engaging with a screw groove formed on an end surface of a polygonal screw head, and a fitting formed at a position closer to a base end side than the screw bit portion. Department,
And a shaft body having a columnar portion formed on the base end side of the fitting portion, a nut bit portion coaxial with the screw bit portion and capable of fitting the screw head portion, the fitting portion A tubular body having a fitting recessed portion that is fitted in the axial body of the shaft body so as to be movable back and forth, and the screw provided in the tubular body between the shaft body and the tubular body. A spring for urging the bit part in a housing direction, the spring bit part is housed in the cylinder when the spring is urged, and the fitting recess is fitted to the fitting part. When the tubular body is rotated together with the shaft body and the tubular body is pressed in the base end direction of the shaft body against the bias of the spring, the fitting recess is positioned in the columnar portion, A driver, characterized in that the cylinder is made to idle.