JP3234111U - Screw holder and driver bit with it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw holder capable of preventing a screw from falling off and efficiently performing a screw attachment / detachment operation, and a driver bit provided with the screw holder. A screw holder (10) slides on a spring fixing member (12) fixed to a driver shaft body (2) and a sliding ring member (13) which is connected to the spring fixing member via a spring (11) and is movable in the axial direction. A fixed ring member 14 fixed to the driver shaft so as to face the ring member, and an arm support member 15 externally fitted between the sliding ring member and the fixed ring member and provided so as to be movable and rotatable in the axial direction. A plurality of arm members 16 which are fixed to the arm support member and whose tip vicinity abuts on the screw to hold the screw, and the arm member extends from the arm support member toward the radial outer side of the driver shaft body. It curves diagonally inward in the direction of the combined blade and further in the opposite direction, and the screw comes into contact with the object to be tightened and the vicinity of the tip expands outward. [Selection diagram] Fig. 2

Description

The present invention relates to a screw holder for a driver and a driver bit provided with the screw holder.

Conventionally, in order to prevent a screw from falling off from the tip of a screwdriver during a screw tightening operation, it is known that the screwdriver is provided with a screw holder for holding the screw.

For example, Patent Document 1 includes a driver insertion portion having a hole for inserting a driver shaft, a pair of arms extending from the driver insertion portion, and a tightening member externally fitted to the pair of arms. Screw holders for drivers are disclosed. A holding portion is formed at the ends of the pair of arms so that both end faces face each other, and the holding portion opens and closes by sliding the tightening member in the longitudinal direction. With this pinching portion, a screw that engages with the tip of the driver can be pinched.

Further, Patent Document 2 discloses a screwdriver bit attached to a rotating shaft of an electric rotary tool, which is provided with a guide cylinder so that the screw does not fall off from the bit during tightening. ing. The guide cylinder is formed of a metal cylinder, is rotatably fitted to the tip of the bit body, and has an inner diameter to which the head of the screw to be tightened is loosely fitted.

JP-A-2019-188478 Jikkenhei 04-9277 Gazette

However, in the screw holder of the above-mentioned conventional technique, there is a point to be improved in order to prevent the screw from falling off and to enable safe work to be performed efficiently.

Specifically, as in the prior art disclosed in Patent Document 1, in the configuration in which the tightening member is slid in the longitudinal direction to open and close the sandwiching portion and the screw engaged with the tip of the driver is sandwiched, the tightening member slides. The work was not easy.

For example, when holding a screw at the tip of a screwdriver, it is necessary to hold the screw and the screwdriver by hand to slide the tightening member, so that the screw may fall off during this work.

Also, in the work of tightening screws, it is necessary to slide the tightening member to open the holding part that holds the screw, and if this work is delayed, the holding part will be inserted between the screw washer and the tightening surface and tightened. It will be.

Further, in the configuration in which the metal guide cylinder is provided at the tip of the bit body as in the prior art disclosed in Patent Document 2, the screw holder is compared with the screw holder that holds the head of the screw so as to sandwich it. The force for holding the head is weak, and in particular, when the screw is held from above and screwed into the object to be fastened below, there is a problem that the screw easily falls off.

Further, when the tip opening surface of the guide tube reaches the tightening surface, the head of the screw is separated from the engaging blade at the tip of the bit and a tightening force is applied to the screw in a state where the engagement is incomplete. When the tightening is completed, the screw tool engaging groove is crushed. Therefore, in that state, the fastened screw could not be removed.

The present invention has been made in view of the above circumstances, and the purpose of the present invention is to provide a screw holder that prevents screws from falling off and enables efficient screw attachment / detachment work. The purpose is to provide a provided driver bit.

The screw holder of the present invention has a spring fixing member fixed to a driver shaft body having an engaging blade formed at its tip, and the engaging blade of the spring fixing member connected to the spring fixing member via a spring. A sliding ring member that is externally fitted to the driver shaft body in the direction of An arm support member externally fitted to the driver shaft body between the sliding ring member and the fixing ring member and provided so as to be movable and rotatable in the axial direction of the driver shaft body, and fixed to the arm support member. It is provided with a plurality of arm members in which the vicinity of the tip is in contact with the head of the screw to hold the screw, and the arm member extends from the arm support member toward the radial outer side of the driver shaft body. It is characterized in that it is curved diagonally inward in the direction of the engaging blade and further curved in the opposite direction, and the vicinity of the tip thereof expands outward in contact with the object to be fastened to which the screw is tightened.

Further, in the driver bit provided with the screw holder of the present invention, the driver shaft body having a columnar shape on one end side and the engaging blade at the tip is formed, the screw holder is mounted, and the other end side is a hexagonal columnar shape. It is characterized in that it is formed in the above and is fitted to the bit support portion of the electric screwdriver.

According to the screw holder of the present invention, the spring fixing member fixed to the driver shaft body and the spring fixing member are connected to the spring fixing member via a spring and fitted to the driver shaft body in the direction of the engaging blade of the spring fixing member. A sliding ring member that can move in the axial direction of the driver shaft body, a fixing ring member that is fixed to the driver shaft body so as to face the sliding ring member, and a driver between the sliding ring member and the fixing ring member. An arm support member that is externally fitted to the shaft body and is provided so as to be movable and rotatable in the axial direction of the driver shaft body, and a plurality of arms that are fixed to the arm support member and the vicinity of the tip abuts on the head of the screw to hold the screw. A member and. As a result, the screw that engages with the tip of the driver shaft can be sandwiched between the arm members to prevent the screw from falling off.

The arm member extends outward in the radial direction of the driver shaft from the arm support member, curves diagonally inward in the direction of the engaging blade, and further curves in the opposite direction. With such a configuration, the work of setting the screw on the tip of the driver shaft can be easily performed, and the safe fastening work in which the screw does not fall off becomes possible.

Then, the arm member comes into contact with the object to be fastened to which the screw is tightened, and the vicinity of the tip is elastically deformed and opens outward. As a result, the operator can easily release the holding of the screw by the arm member. Further, since the arm support member is rotatably provided with respect to the driver shaft body for tightening the screw, the arm member in contact with the object to be fastened is separated from the head of the screw and rotates together with the screw and the driver shaft body. There is nothing to do. Therefore, the operator can surely tighten the screw until the fastening is completed. In this way, safe and efficient fastening work without screws falling off is realized.

Further, when removing the screw from the object to be fastened, the engaging blade at the tip of the driver shaft is engaged with the engaging groove of the head of the screw with the vicinity of the tip of the arm member pressed against the surface of the object to be fastened. It can be fitted and the screw can be rotated in the removal direction. When the screw moves in the removal direction, the vicinity of the tip of the arm member moves inward, that is, in the direction of the central axis of the driver shaft body, and the head of the screw can be pinched to prevent the screw from falling off. Therefore, the screws can be removed safely and efficiently.

Further, according to the screw holder of the present invention, a cover member whose end in the direction of the engaging blade is open and which is detachably fitted to the arm member from the direction of the spring fixing member, and the driver. A cover support member that is fixed to the shaft body and holds the cover member detachably may be provided. With such a configuration, when the driver is not used, the cover member can be externally fitted to the arm member, and the arm member can be covered with the cover member to protect the arm member. Therefore, it is possible to prevent the arm member from being entangled with other tools and the like, and the tools can be easily handled during storage and preparatory work.

Further, according to the driver bit of the present invention, a driver shaft body having a columnar shape on one end side and having the engaging blade at the tip is formed and the screw holder is mounted, and the other end side is formed on a hexagonal columnar shape and is an electric driver. It is fitted to the bit support part of. As a result, even in the screw fastening work using an electric screwdriver, it is possible to prevent the screw from falling off and perform a safe and highly efficient work.

It is a side view of the driver provided with the screw holder which concerns on embodiment of this invention. It is a side view which shows the vicinity of the arm member of the driver provided with the screw holder which concerns on embodiment of this invention. It is a front view of the screw holder which concerns on embodiment of this invention. It is sectional drawing which shows the structure in the vicinity of the arm support member of the screw holder which concerns on embodiment of this invention. It is a side view which shows the state which held the screw of the driver which provided the screw holder which concerns on embodiment of this invention. It is a side view which shows the state which fastened the screw of the driver provided with the screw holder which concerns on embodiment of this invention. It is a side view which shows the state when the driver provided with the screw holder which concerns on embodiment of this invention is not used. It is a side view of the driver bit provided with the screw holder which concerns on another embodiment of this invention. It is a perspective view of the cover member of the screw holder which concerns on other embodiment of this invention. It is a side view which shows the state when the driver bit provided with the screw holder which concerns on another embodiment of this invention is not used.

Hereinafter, the driver 1 and the driver bit 101 including the screw holder 10 according to the embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a side view showing a schematic configuration of a driver 1 including a screw holder 10 according to an embodiment of the present invention.

As shown in FIG. 1, the screw holder 10 is attached to a driver 1 which is generally used as a tool for fastening a screw 30, and prevents the screw 30 from falling off. The driver 1 is a so-called Phillips screwdriver in which a substantially cross-shaped engaging blade 3 is formed at the tip of the driver shaft body 2, but a flat-blade screwdriver (not shown) in which a substantially linear engaging blade 3 is formed may also be used. The screw holder 10 includes an arm 16 as an arm member provided near the engaging blade 3 at the tip of the driver shaft body 2 to hold the screw 30, and a cover 20 as a cover member fitted to the arm 16 when not in use. , Have.

FIG. 2 is a side view showing the vicinity of the arm 16 of the driver 1 including the screw holder 10.
As shown in FIG. 2, the screw holder 10 slides connected to the spring fixing member 12 fixed to the driver shaft body 2, the spring 11 as the spring member, and the spring fixing member 12 via the spring 11. A sliding ring 13 as a ring member, a fixing ring 14 as a fixing ring member fixed to the driver shaft body 2, and an arm support member 15 rotatably provided between the sliding ring 13 and the fixing ring 14. , A plurality of arms 16 provided on the arm support member 15.

The spring fixing member 12 is a member that holds the spring 11. For example, the spring fixing member 12 is formed in an annular shape, is fitted onto the driver shaft body 2, and is fixed to the driver shaft body 2 by a hexagon socket set screw or the like (not shown). One end of the spring 11 fitted to the driver shaft body 2 is fixed to the spring fixing member 12.

The spring 11 is a spring that presses the arm support member 15 in the direction of the tip of the driver shaft body 2, that is, in the direction of the engaging blade 3. One end of the spring 11 is fixed to the spring fixing member 12, and the other end in the direction of the engaging blade 3 is fixed to the sliding ring 13 outerly fitted to the driver shaft body 2.

The sliding ring 13 is fitted onto the driver shaft body 2 in the direction of the engaging blade 3 of the spring fixing member 12, and is connected to the spring fixing member 12 via the spring 11. The sliding ring 13 has, for example, an annular shape and is slidable in the axial direction of the driver shaft body 2.

A fixing ring 14 fixed to the driver shaft 2 so as to face the sliding ring 13 is provided in the direction of the engaging blade 3 of the sliding ring 13. The fixing ring 14 has, for example, an annular shape, is fitted onto the driver shaft body 2, and is fixed to the driver shaft body 2 by a hexagon socket set screw or the like (not shown).

The fixing ring 14 is fixed so that the position in the axial direction can be changed with respect to the driver shaft body 2. In this way, the sliding ring 13 that is pressed by the spring 11 and can move in the axial direction of the driver shaft body 2, and the fixing ring 14 that is fixed so that the position in the axial direction can be changed with respect to the driver shaft body 2. By providing the arm support member 15 between the two, the position of the arm 16 can be adjusted to a suitable position corresponding to the size and shape of the screw 30 (see FIG. 1). Therefore, it is possible to safely fasten various screws 30 of different sizes and types without falling off.

The arm support member 15 is a member that supports the arm 16 as described above, and is externally fitted to the driver shaft body 2 between the sliding ring 13 and the fixing ring 14. Specifically, the arm support member 15 has a substantially annular shape, is fitted onto the driver shaft body 2 via a bobbin 19, and is slidable in the axial direction and rotational direction of the driver shaft body 2. It is provided.

The screw holder 10 includes an arm support member 15 and a plurality of arms 16 that are fixed to the arm support member 15 and whose tip vicinity abuts on the head 31 (see FIG. 1) of the screw 30 to hold the screw 30. do. As a result, the screw 30 that engages with the tip of the driver shaft 2 can be sandwiched by the arm 16 to prevent the screw 30 from falling off.

A plurality of arms 16 are fixed to the arm support member 15 by, for example, welding or brazing. The arm 16 is formed so as to be elastically deformable from, for example, a substantially rod-shaped or substantially flat plate-shaped steel material.

Specifically, one end of the arm 16 is fixed in the vicinity of the outer peripheral portion of the arm support member 15, and extends outward in the radial direction from the vicinity of the outer peripheral portion of the arm support member 15. There is. An outer curved portion 17 that curves diagonally inward in the direction of the engaging blade 3 is formed at the tip of the driver shaft body 2 of the arm 16 that extends outward in the radial direction. That is, the arm 16 extends outward in the radial direction of the driver shaft body 2, and is curved toward the tip of the driver shaft body 2 at the outer curved portion 17 beyond the arm 16.

Further, at the tip of the outer curved portion 17, an inner curved portion 18 that curves in the direction opposite to the outer curved portion 17 is formed so as to go outward in the radial direction of the driver shaft body 2. The tip of the inner curved portion 18 is curved in the same bending direction as the inner curved portion 18 to form a substantially ring shape.

In other words, the outer curved portion 17 has a form in which the arm 16 bulges outward in the radial direction of the driver shaft body 2, and the inner curved portion 18 has a smaller diameter than the outer curved portion 17 so that the arm 16 is recessed inward. It is curved to. The arm 16 is formed in a substantially tulip shape, and the engaging blade 3 at the tip of the driver shaft body 2 is located inside the vicinity of the inner curved portion 18 of the tulip shape. By providing the arm 16 having such a shape, the screw 30 can be preferably held, and the screw 30 can be easily held and released.

FIG. 3 is a front view showing the vicinity of the arm 16 of the screw holder 10, and is a view of the screw holder 10 as viewed from the tip direction of the driver shaft body 2.
As shown in FIG. 3, the screw holder 10 has three arms 16. The number of arms 16 is not limited to this, but three are most preferable from the viewpoint of efficiency and safety of the work of holding the screw 30 (see FIG. 5).

With such a configuration, as shown in FIG. 1, the screw 30 can be suitably held at the tip of the driver shaft body 2. Further, the work of setting the screw 30 on the engaging blade 3 of the driver 1 and the work of removing the screw 30 from the engaging blade 3 can be easily and safely performed.

FIG. 4 is a cross-sectional view showing a configuration of the screw holder 10 in the vicinity of the arm support member 15.
As shown in FIG. 4, the arm support member 15 is a member that supports the arm 16, and is externally fitted to the driver shaft body 2 via a bobbin 19 between the sliding ring 13 and the fixing ring 14. ..

The bobbin 19 is formed of, for example, a synthetic resin material, and is a member that supports the arm support member 15 with respect to the driver shaft body 2 so as to be movable and rotatable in the axial direction. That is, the bobbin 19 is slidable in the axial direction and slidable in the rotational direction with respect to the driver shaft body 2. Further, the arm support member 15 is slidable and rotatable with respect to the bobbin 19. By providing such a bobbin 19, the sliding resistance of the arm support member 15 with respect to the driver shaft body 2 is reduced, and the arm portion can be easily moved.

FIG. 5 is a side view showing a state in which the screw 30 of the driver 1 including the screw holder 10 is held.
With reference to FIG. 5, in the step of tightening the screw 30, the engaging blade 3 of the driver 1 is engaged with the engaging groove 32 of the head 31 of the screw 30, and the head of the screw 30 is engaged by the three arms 16. The vicinity of 31 is sandwiched. As described above, the work of holding the screw 30 in the driver 1 is easy.

Then, the operator holds the grip portion 4 (see FIG. 1) of the driver 1 and tightens the screw 30 to the object to be fastened 35. At this time, the arm 16 rotates together with the screw 30 and the driver shaft body 2 engaged with the screw 30 while holding the screw 30. As a result, a safe fastening operation is performed in which the screw 30 does not fall off.

FIG. 6 is a side view showing a state in which the screw 30 of the driver 1 including the screw holder 10 is fastened.
As the tightening of the screw 30 is advanced, the vicinity of the tip of the arm 16 comes into contact with the object to be fastened 35 to which the screw 30 is tightened. Then, the arm 16 is elastically deformed and the vicinity of the tip is opened to the outside along the surface of the object to be fastened 35, that is, the radial outside of the driver shaft body 2. As a result, the holding of the screw 30 by the arm 16 is released. In this way, the holding of the screw 30 by the arm 16 can be easily released.

Further, since the arm support member 15 is rotatably provided with respect to the driver shaft body 2 for tightening the screw 30, the arm 16 in contact with the surface of the object to be fastened 35 is separated from the head 31 of the screw 30. , The screw 30 and the driver shaft 2 do not rotate together.

That is, in a state where the arm 16 is in contact with the surface of the object to be fastened 35 and is not rotating, the driver shaft 2 is rotated so as to slide with respect to the arm support member 15, and is engaged with the engaging blade 3 at the tip. The held screw 30 can be rotated. Therefore, the screw 30 can be securely tightened until the fastening is completed. In this way, safe and efficient fastening work without the screw 30 falling off is realized.

When removing the screw 30 from the object to be fastened 35, the engaging blade 3 at the tip of the driver shaft 2 is pressed against the surface of the object to be fastened 35 while the vicinity of the tip of the arm 16 is pressed against the surface of the object to be fastened 35. The screw 30 can be rotated in the removing direction by engaging with the engaging groove 32 of 31. Even in such a state, since the driver shaft body 2 and the screw 30 can be rotated without rotating the arm 16, the surface of the engaged object is not damaged by the rotation of the arm 16.

Then, when the driver 1 is further turned and the screw 30 moves in the removal direction, the vicinity of the tip of the arm 16 moves inward, that is, in the direction of the central axis of the driver shaft body 2, and as shown in FIG. The head 31 of the screw 30 can be sandwiched to prevent the screw 30 from falling off. Therefore, the operator can safely and efficiently remove the screw 30.

FIG. 7 is a side view showing a state in which the driver 1 including the screw holder 10 is not used.
With reference to FIGS. 1 and 7, the screw holder 10 has a cover 20 that accommodates and protects the arm 16 when not in use. The cover 20 is a substantially cylindrical member formed of, for example, a transparent synthetic resin material or the like.

When the driver 1 is not used for screw fastening work, the cover 20 is fitted to the arm 16 as shown in FIG. Specifically, the cover 20 has an opening at the end in the direction of the engaging blade 3, and is detachably fitted to the arm 16 from the direction of the spring fixing member 12. As a result, when the driver 1 is not used, the cover 20 can be fitted onto the arm 16 and protected by covering the arm 16 with the cover 20. Therefore, it is possible to prevent the arm 16 from being entangled with other tools and the like, and the tools can be easily handled during storage and preparatory work.

As shown in FIG. 1, the screw holder 10 has a cover support member 25 that is fixed to the driver shaft body 2 and holds the cover 20 detachably. When the operator uses the driver 1 to fasten the screw 30, the cover 20 is removed from the arm 16 and supported by the cover support member 25. As a result, the circumference of the arm 16 is opened so that the arm 16 can be elastically deformed in the radial direction of the driver shaft body 2 to hold the screw 30.

The form of the cover support member 25 may be any as long as the cover 20 can be detachably supported. For example, the cover support member 25 is a member that is externally fitted and fixed to the driver shaft body 2, and the cover 20 is externally fitted and detachably fixed. It may be a substantially cylindrical member formed with an outer diameter as large as possible.

Further, at least one of the cover 20 and the cover support member 25 may be formed with an engaging support portion (not shown) for holding the cover 20. The engaging support portion may have, for example, a convex shape formed on the outer peripheral portion of the cover support member 25 and abutting on the inner peripheral portion of the cover 20, or a convex shape and a concave shape that engage in a key shape.

Next, with reference to FIGS. 8 to 10, the driver bit 101 will be described in detail as an example of modifying the embodiment. The components having the same or similar actions and effects as those of the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 8 is a side view of the driver bit 101 including the screw holder 110 according to another embodiment of the present invention.
As shown in FIG. 8, the driver bit 101 is provided with a screw holder 110 that sandwiches the screw 30 (see FIG. 5) to prevent it from falling off. The driver bit 101 has a substantially cylindrical driver shaft body 2 formed on one end side, and a substantially hexagonal columnar hexagonal shaft body 102 formed on the other end side.

At the tip of the driver shaft body 2, an engaging blade 3 that engages with the engaging groove 32 (see FIG. 5) of the head 31 (see FIG. 5) of the screw 30 is formed. An annular bit support groove 103 is formed in the hexagonal shaft body 102 on the other end side, and the hexagonal shaft body 102 is fitted into a bit support portion of an electric screwdriver (not shown).

A screw holder 110 having an arm 16 that holds the screw 30 and prevents the screw from falling off is attached to the driver shaft body 2. The basic configuration of the screw holder 110 is substantially the same as that of the screw holder 10 (see FIG. 2) described above.

The spring fixing member 112 is a member substantially similar to the spring fixing member 12 (see FIG. 2) described above, and has a substantially disk-like shape, and the outer diameter thereof is a cover 120 having a substantially cylindrical shape. It is almost the same as the inner diameter of. Therefore, the cover 120 is slidably fitted onto the spring fixing member 112, and the spring fixing member 112 can safely support the cover 120 when the driver bit 101 is used and when the driver bit 101 is not used.

The outer peripheral portion of the spring fixing member 112 and the inner peripheral portion of the cover 120 may be formed with positioning convex portions or concave portions that hold the cover 120 at a predetermined position suitable for work when the driver bit 101 is used. As a result, the operator can perform safe work without the cover 120 hindering the deformation of the arm 16 during work.

A cover support member 125 that detachably supports the cover 120 is fixed to the hexagonal shaft body 102. The cover support member 125 has, for example, a substantially disk-like shape, and is externally fitted and fixed to the hexagonal shaft body 102 so that its central axis is coaxial with the central axis of the hexagonal shaft body 102.

The cover support member 125 is formed with an engaging convex portion 26 that protrudes from the surface of the driver shaft body in two directions. The engaging convex portion 26 has, for example, a substantially T-shaped side view, and engages with the engaging hole portion 23 of the cover 120, which will be described later.

At the end of the cover 120 on the hexagonal shaft body 102 side, a support portion 21 that comes into contact with the cover support member 125 and is detachably fixed is provided. The support portion 21 has, for example, a substantially disk-shaped shape, and the vicinity of the outer peripheral portion thereof is fixed in the vicinity of the peripheral end portion of the cover 120 having a substantially cylindrical shape.

FIG. 9 is a perspective view of the cover 120 of the screw holder 110 as viewed from the back side.
As shown in FIG. 9, the support portion 21 of the cover 120 is formed with a shaft hole 22 into which the hexagonal shaft body 102 (see FIG. 8) of the driver bit 101 is inserted. The shaft hole 22 is a hole formed in a circular shape at the center of the support portion 21 so that the cover 120 is rotatable around the hexagonal shaft body 102 and slidable in the axial direction.

An engaging hole portion 23 is formed in the support portion 21 of the cover 120. A substantially T-shaped engaging convex portion 26 (see FIG. 10) formed in the cover support member 125 (see FIG. 10) is inserted into the engaging hole portion 23. By rotating the cover 120 with the engaging convex portion 26 inserted, the engaging convex portion 26 engages with the engaging hole portion 23, and the cover 120 is held so as not to come off from the cover support member 125. Will be done.

With such a configuration, when using the driver bit 101, the cover 120 is removed from the arm 16 (see FIG. 8), the engaging convex portion 26 is inserted into the engaging hole portion 23, and the supporting portion 21 of the cover 120 is inserted. Can be brought into contact with the cover support member 125, and the engaging convex portion 26 and the engaging hole portion 23 can be engaged with each other to safely support the cover 120. Therefore, the cover 120 does not hinder the deformation of the arm 16, and the operator can efficiently perform safe work.
Then, when the driver bit 101 is not used, the operator can easily remove the cover 120 from the cover support member 125 by disengaging the engaging convex portion 26 and the engaging hole portion 23.

FIG. 10 is a side view showing a state when the driver bit 101 including the screw holder 110 is not used.
As shown in FIG. 10, when the driver bit 101 is not used, the cover 120 can be fitted on the arm 16 and the arm 16 can be covered by the cover 120. As a result, the arm 16 is not entangled with other tools or the like, and the driver bit 101 can be easily stored and the work for that purpose becomes easy.

As described above, according to the driver bit 101 according to the present embodiment, even in the screw fastening work using an electric screwdriver, it is possible to prevent the screw 30 from falling off and perform a safe and highly efficient work.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

1 Driver 2 Driver Shaft 3 Engagement blade 4 Grip 10, 110 Screw holder 11 Spring 12, 112 Spring fixing member 13 Sliding ring 14 Fixing ring 15 Arm support member 16 Arm 17 Outer curved part 18 Inner curved part 19 Bobbin 20, 120 Cover 21 Support 22 Shaft hole 23 Engagement hole 25, 125 Cover support member 26 Engagement convex part 30 Screw 31 Head 32 Engagement groove 35 Engagement 101 Driver bit 102 Hexagonal shaft 103 Bit support groove

Claims (3)

A spring fixing member fixed to the driver shaft with an engaging blade formed at the tip,
A sliding ring member that is connected to the spring fixing member via a spring, is fitted onto the driver shaft body in the direction of the engaging blade of the spring fixing member, and is movable in the axial direction of the driver shaft body.
A fixing ring member fixed to the driver shaft so as to face the sliding ring member,
An arm support member that is fitted onto the driver shaft body between the sliding ring member and the fixing ring member and is provided so as to be movable and rotatable in the axial direction of the driver shaft body.
A plurality of arm members fixed to the arm support member and having a vicinity of the tip abutting against the head of the screw to hold the screw are provided.
The arm member extends outward in the radial direction of the driver shaft from the arm support member, is curved diagonally inward in the direction of the engaging blade, and is further curved in the opposite direction, and the screw is tightened. A screw holder characterized in that the vicinity of the tip thereof expands outward in contact with the object to be fastened. A cover member that has an opening at the end in the direction of the engaging blade and is detachably fitted to the arm member from the direction of the spring fixing member.
The screw holder according to claim 1, further comprising a cover support member fixed to the driver shaft body and detachably holding the cover member. The driver shaft body having a columnar shape on one end side and having the engaging blade at the tip is formed, and the screw holder is attached.
The driver bit provided with the screw holder according to claim 1 or 2, wherein the other end side is formed in a hexagonal columnar shape and is fitted to a bit support portion of the electric driver.

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