JP2003266323A - Screw driver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screwdriver which does not interfere with proper engagement/disengagement of a screwdriver bit with a hole for screwdriver at the head of a screw, can prevent the screwdriver bit from removing or trying to remove from the screw-head hole during tightening/loosening operation of the screw and thus, enables smooth tightening or loosening operation of the screw while preventing crushing of the hole on the screw head. <P>SOLUTION: In this screwdriver A in which the screwdriver bit 12 which is capable of engagement/disengagement with/from the hole for screwdriver provided at the screw head is formed at a tip end 11 of a rotation shaft 1, a plurality of recesses 3 for stopping slip are provided at least at a part of the outer face in contact with the inner face of the hole for screwdriver of the screwdriver bit 12. <P>COPYRIGHT: (C)2003,JPO

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 engaging a tip bit of a screwdriver with a screwhole provided in a head of the screw to tighten or loosen the screw from a tightened state. .

[0002]

2. Description of the Related Art A general screw is + (plus) on the screw head.
Shape,-(minus) shape, a shape that also serves as both, or a cross-sectional polygonal shape.

On the other hand, a screwdriver for rotating such a screw has a screwdriver bit at a tip end thereof, the screwdriver bit having a shape and a size matching the screwdriver hole, and the bit is engaged with the screw head hole. The screw can be tightened or loosened by rotating the screw in a predetermined direction while pressing the screw.

The size and shape of the screw head hole can be changed according to the type of screw and the purpose of use. In accordance with this, a plurality of screwdrivers are prepared in which the bit at the tip of the screwdriver is matched with the size and shape of the screw head hole.

[0005]

However, in any case, when tightening or loosening the screw, it may be difficult to press the screwdriver against the screw depending on the installation location, angle, etc. of the screw, and the tip bit of the screwdriver may be difficult to press. It may come off from the screwdriver hole on the screw head. When trying to transfer a large torque from the screwdriver to the screw, the screwdriver is likely to come off the screw head, especially when loosely tightening the screw and tightening the screw tightly. For example, in the case of a Phillips screw or a minus screw, when the tip bit of the screwdriver comes out of the screw head hole, the screwdriver bit breaks the edge of the screw head hole little by little, and the tip bit of the screwdriver It cannot fit tightly into the head hole, it becomes slippery, and torque cannot be transmitted from the screwdriver to the screw. That is, the screw head hole is crushed (so-called,
The screw is licked). If the head of the screw is licked, the screw cannot be tightened or loosened.

When a screw having a polygonal cross-section screw-driving hole (typically a hexagon socket head cap screw) is tightened or loosened with a screwdriver having the same hole cross-sectional shape, the screw-driving bit is screwed. If the screwdriver is operated with the head hole in the correct posture and not inserted to the correct depth, the apex of the polygonal cross section of the screw head hole will be crushed and the hole will be circular when a large tightening torque is applied. The shape may be close to, and then tightening torque cannot be applied.

Therefore, according to the present invention, there is no problem in correctly engaging and disengaging the screwdriver bit with the screwdriver hole of the screw head, and moreover, the screwdriver bit moves from the screw head hole during the operation of tightening or loosening the screw. An object of the present invention is to provide a screwdriver that can be prevented from coming off or trying to come off, and thus can prevent the screw head hole from being crushed to that extent, and can smoothly perform the tightening or loosening operation of the screw.

[0008]

In order to solve the above problems, the present invention provides a screwdriver having a screwdriver bit formed at the tip of a rotary shaft, the screwdriver bit being engageable with and disengageable from a screwdriver hole provided in a screw head. A screwdriver, wherein a plurality of recesses for slip prevention are engraved on at least a part of an outer surface of the screwdriver bit facing the inner surface of the screwdriver hole. To do.

According to the screwdriver of the present invention, there is no problem in correctly engaging and disengaging the screwdriver bit with the screwdriver hole of the screw head. Moreover, it is possible to prevent the screwdriver bit from coming off from the screw head hole or attempting to come off from the screw head hole during the operation of tightening or loosening the screw. Therefore, the screw head hole can be prevented from being crushed to that extent, and the screw can be tightened or loosened smoothly.

[0010] To further explain, according to this screwdriver, the screwdriver bit can be formed into a shape and a size that exactly match the screwdriver hole in the screw head of the screw to be rotated. In this state, the structure can further have a plurality of recesses for preventing the slip. Therefore,
There is no problem in properly engaging and disengaging the screwdriver bit with the screw head hole. Moreover, since the bit has a non-slip recess, particularly the outer edge of the projecting edge, concentrates on the inner surface of the screw head hole to generate a frictional force or a catching force. hard.

Further, the anti-slip recess is formed on the outer surface of the screwdriver bit, so that the recess can be easily formed.

The non-slip recess includes (1) a recess groove extending in a direction transverse to the rotation center axis of the rotary shaft,
(2) A groove extending parallel to the rotation center axis of the rotation shaft,
(3) It is possible to widely employ a plurality of concave grooves that intersect in a lattice pattern and that generate frictional force or hooking force with the inner side surface of the screw driving hole of the screw head.

The lattice-shaped concave groove is exemplified by a lattice-shaped concave portion in which a concave groove extending in a direction crossing the rotation center axis of the rotating shaft intersects with a groove extending parallel to the rotation center axis of the rotating shaft. it can. In addition, frictional force is likely to occur, such as a groove in which the intersecting grooves are inclined at a predetermined angle with respect to the central axis, or an angle that changes depending on the distance from the central axis of the outer surface of the screwdriver. The thing can be widely adopted.

The screwdriver bit is, for example, a polygonal cross-section bit that fits in a cross-sectional polygonal hole formed in the screw head, and the anti-slip recess is provided on at least one outer surface of the bit. What is formed can be mentioned.

An example of the polygonal cross-section bit is a hexagonal cross-section bit that can be applied to a hexagon socket head cap screw.

As the screwdriver bit,
(1) A cross-shaped cross-shaped bit that fits in a cross-shaped hole (so-called plus hole) formed in the screw head, and the non-slip portion is formed on the outer surface of at least one of the vertical projections of the cross-shaped cross-shaped bit. (2) A plate-shaped bit that fits in a linearly extending groove-shaped hole (so-called minus hole) formed in the screw head, and has a wide outer side surface of the plate-shaped bit. It is possible to exemplify the one in which the anti-slip recess is formed in at least one of them.

In the screwdriver according to the present invention, which is provided with the anti-slip groove as described above, the anti-slip groove is provided on the outer surface of the bit, so that the groove can be easily formed.

By using the screwdriver according to the present invention, there is no problem in correctly engaging and disengaging the screwdriver bit with the screwdriver hole of the screw head, and while the screw tightening or loosening operation is being performed. It is possible to prevent the screwdriver bit from coming off or trying to come off the screw head hole, and therefore,
Thus, the screw head hole is prevented from being crushed, and the screw can be tightened or loosened smoothly.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1A and 1B are a schematic front view of an example of a screwdriver and a schematic plan view of a screwdriver bit, respectively.

The screwdriver A shown in FIGS. 1A and 1B is
It has a first screwdriver rotating shaft 1 and a second screwdriver rotating shaft 2, and the first screwdriver rotating shaft 1 and the second screwdriver rotating shaft 2 are formed to have a hexagonal cross section (see FIG. )), Both rotary shafts are formed integrally in an L-shape with an angle of 90 degrees.

The first screwdriver rotating shaft 1 is formed shorter than the second screwdriver rotating shaft 2. The first screwdriver rotating shaft 1 and the second screwdriver rotating shaft 2 each have a tip portion 11, 21 which can be engaged with a screwdriver hole provided in a screw head of a screw such as a hexagon socket head bolt. Bit 12,
It is formed in the second bit 22.

The rotation center axis 1 of the first rotation shaft 1 is formed on each of the outer surfaces of the bits 12 and 22 having a hexagonal cross section.
3 and the concave groove 3 extending parallel to the rotation center axis line 23 of the second rotation shaft 2. Each groove 3 has a rectangular cross section, but is not limited thereto. For example, a groove having a chevron cross section may be used.

When the first bit 12 is engaged with the screwdriver hole of the screw head, the second screwdriver rotating shaft 2 is perpendicular to the first screwdriver rotating shaft 1, so that the screw is tightened or loosened. It can be used as a handle to apply torque to. On the contrary, when the second bit 22 is engaged with the screw hole of the screw head, the first screwdriver rotation shaft 1 can be used as a handle.

The screwdriver A is shown here as having bits 12 and 22 having a hexagonal cross-section, but the present invention is not limited to this, and a bit having a cross-section that conforms to the shape of the screwdriver hole of the screw head. May be included. In addition, the first bit and the second bit have different shapes and / or
A screwdriver that is a bit of a size can also be exemplified.

The angle formed by the rotary shaft 1 and the rotary shaft 2 is 90 degrees here, but is not particularly limited as long as it is an angle at which the screw can be easily turned. It may be 180 degrees. That is, axes 1, 2
May be continuous in the shape of a single rod.

The screwdriver A has concave grooves formed on all six surfaces, but if sufficient frictional force and hooking force can be generated between the screwdriver A and the inner side surface of the screw head hole, it can be concaved on all surfaces. It is not necessary to provide a groove.

Although the groove 3 is shown as extending in parallel to the central axes 13 and 23, it is not limited to this.
For example, the central axes 13 and 23 may be inclined at a slight angle in the circumferential direction.

In the screwdriver A, the first screwdriver rotating shaft 1 is formed shorter than the second screwdriver rotating shaft 2,
Both rotating shafts may be formed to have the same length.

FIGS. 2A and 2B are an enlarged schematic front view of another example of the screwdriver according to the present invention and a schematic plan view of the screwdriver bit portion.

The screwdriver B shown in FIG. 2 is a so-called + (plus) screwdriver screwdriver having a cross-shaped cross-shaped bit 5 at the tip 41 of the rotary shaft 4.

As shown in FIG. 2, bit 5 of screwdriver B
To the outer surface 511 of the vertical convex strip 51 having a cross-shaped cross section,
A plurality of recessed grooves 512 extending in a direction crossing the screwdriver rotation center axis 6 are formed.

In the bit 5 of the screwdriver B shown in this example, the concave groove 512 is provided on each of the outer side surfaces 511 of the ridges 51 having a cross-shaped cross section, but the present invention is not limited to this, and the screw head is not limited thereto. If it is possible to generate sufficient frictional force and hooking force with the inner surface of the hole, it is not necessary to provide all the ridges.

In this embodiment, the groove 512 extends in the direction perpendicular to the central axis 6 in the side view, but it may be installed at a slight angle with respect to the axis 6.

FIG. 3 is an enlarged schematic front view of still another example of the screwdriver according to the present invention.

The screwdriver C shown in FIG. 3 has a plate-shaped bit 8 at the tip portion 71 of the rotary shaft 7 for engaging in a linearly extending groove-shaped hole as a screwdriver hole for the screw head. , A so-called (minus) driver-like screwdriver.

As shown in FIG. 3, in the plate-shaped bit 8 of the screwdriver C, a concave groove 811 extending parallel to the rotation center axis 9 and a concave groove extending in a direction orthogonal to the rotation center axis 9 are formed on each of the wide side surfaces 81 of the bit 8. The grid-shaped non-slip grooves 82 are formed by 812. In addition, as a result, a plurality of protrusions are preferably formed.

In the plate-shaped bit 8 of the screwdriver C shown in this example, the grid-shaped concave grooves 82 are provided on each of the wide side surfaces 81, but the invention is not limited to this, and a sufficient frictional force or a frictional force can be obtained. The lattice-shaped concave grooves 82 may be provided only on one of the wide side surfaces as long as a hanging force can be generated.

As the lattice-shaped concave groove 82, in this example, the concave groove 811 parallel to the rotation center axis 9 and the concave groove 812 in the direction orthogonal to the concave groove 811 are shown, but the present invention is not limited to this. , The crossing angle of the grid-like grooves is inclined at a slight angle while maintaining the crossing angle of 90 degrees, the crossing angle of the grid-like grooves is configured at an angle other than 90 degrees, and the grid is wide depending on the location on the side surface. It is also possible to exemplify a case in which the crossing angle of the concave groove changes.

According to the screwdrivers A, B and C described above, the screwdriver bits (12, 22), 5 and 8 are shaped so as to fit exactly into the screwdriver holes to be screwed with the screwdriver bits. Since it is formed in a size, the bit can be engaged with and disengaged from the screw head hole without any trouble. Also,
The bits (12, 22), 5 and 8 have anti-slip concave grooves 3, 512 and 82 on their outer surfaces, and these concave grooves, in particular, the outer peripheral edge portions 3a, 512a and (811a). ,
Since 812a) intensively contacts the inner surface of the screw head hole to generate frictional force or hooking force, it is difficult for the bit to come off from the screw head hole during the screwdriver operation, which ensures smooth and reliable screwdriver operation. It is possible.

The above-mentioned screwdrivers A, B and C are respectively
The groove 3 extending parallel to the rotation axis 13 and 23, the groove 512 extending in the direction crossing the rotation axis 6, the groove 811 extending parallel to the rotation axis 9 and the groove 8 extending vertically.
Although the lattice-shaped concave grooves 82 formed by 12 are shown as different types of concave grooves, the present invention is not limited to this. Even if the screwdrivers A, B, C are formed with different types of concave grooves as described above. Good.

Further, a plurality of concave grooves of different types described above may be formed in one screwdriver.

FIG. 4A is an enlarged view of a screwdriver having a hexagonal cross-section bit, and FIG. 4B is an enlarged view of a screwdriver having a cross-shaped bit in plan view. FIG. 4C is an enlarged view of a screwdriver bit having a plate-shaped bit, and FIG. 4D is a sectional view of the screwdriver bit shown in FIG. 4 (E) is a cross-sectional view of the screwdriver bit shown in FIG. 4 (B) engaged with the screw head.
4F is a sectional view of the screwdriver bit shown in FIG. 4C in a state in which the screw head is engaged.

The screwdrivers shown in FIGS. (A), (B) and (C) are a screwdriver A'having a bit 12 'having a hexagonal cross section and a screwdriver B'having a bit 5'having a cross shape in plan view. , A screwdriver C'with a plate-shaped bit 8 ', the anti-slip grooves 3', 512 ', 82' of each bit 12 ', 5', 8'extending in a direction transverse to the respective central axis of rotation. .

As shown in FIG. 4 (D), the concave groove 3'has an upper surface portion 31 'and a lower surface portion 32', and the upper surface portion 31 'is located at the inner side of the screw driving hole 10 of the screw head. It is formed facing away from the inner side surface 101 of the hole 10, and the lower surface portion 32 'is formed perpendicular to the inner side surface 101, so that the bit 12' of the screwdriver A'is formed in the hole 10. While it is easy to insert, the projecting edge 3a 'of the groove 3'is formed on the inner surface 101
It is hard to come off because it comes into close contact with.

As shown in FIG. 4E, the groove 512 'of the screwdriver B'has an upper surface portion 513' and a lower surface portion 514 ', and both the upper surface portion 513' and the lower surface portion 514 'are
The inner surface 101 of the hole 10 toward the back of the hole 10 for screwdriver
It is formed so as to be separated from, and the protruding edge portion 512a 'of the concave groove 512' can intensively contact the hole inner surface 101.
It is more difficult for the bit to come off than when the concave groove 3'of the screwdriver A'is adopted.

The groove 8 of the screwdriver C'shown in FIG. 4 (F)
2'has an upper surface portion 821 'and a lower surface portion 822'. Further, a flat surface portion 823 ′ that contacts the inner side surface 101 of the screw driving hole 10 is provided between the adjacent concave grooves 82 ′, and the upper surface portion 821 ′ faces the back of the screw driving hole 10. The lower surface portion 822 'is formed to be separated from the inner side surface 101 of the hole 10, and the lower surface portion 822' is formed perpendicular to the inner side surface 101.
The projecting edge portion 82a 'of the recessed groove 82' can intensively contact the inner surface 101 of the hole. Therefore, the bit 8'of the screwdriver C'is easy to insert into the hole 10 and difficult to pull out. In addition, a flat surface portion 823 'that contacts the inner side surface 101 of the screwdriver hole 10
Therefore, the frictional force can be secured in the direction in which the concave groove 82 'extends, and the strength is sufficiently maintained.

The concave grooves 3 ', 512', 82 'have sloped portions 31', 513 ', 821', respectively, which are used for screwdrivers A ', B', C ', respectively.
It is not limited to these. In addition, screwdriver A,
It is also possible to use it in combination with a groove having no slope portion such as the concave groove formed in B and C.

In any case, as shown in FIG. 4G, the concave groove extending in the direction transverse to the screwdriver rotation axis provided in the bit has a surface and a concave surface which become the upper surface of the concave groove when it is directed downward. It has a surface that becomes an inner lower surface of the groove, and the lower surface makes an angle (obtuse angle) θ at a right angle or more with the inner surface of the screwdriver hole of the screw head, or the outer edge of the lower surface. A lower edge of the groove (for example, 3a ′, 512 described above).
a ', 82a') is formed so as to form a right angle or an obtuse angle θ with respect to the tangent surface of the outer surface of the bit. It is preferable for stopping. In this case, the concave grooves may be formed in a grid shape.

[0050]

According to the present invention, there is no problem in correctly engaging and disengaging the screwdriver bit with the screwdriver hole of the screwhead, and moreover, the screwdriver bit moves while the screwdriver bit is being tightened or loosened. It is possible to provide a screwdriver which can be prevented from coming off from the hole or attempting to come off, and thus can prevent the screw head hole from being crushed to that extent, and can smoothly perform the tightening or loosening operation of the screw.

Further, according to the present invention, the anti-slip recess is formed on the outer surface of the screwdriver bit, and the recess can be easily formed. Therefore, it is possible to provide a screwdriver which is inexpensive and easy to manufacture. You can

[Brief description of drawings]

FIG. 1 is a schematic front view of an example of a screwdriver according to the present invention, and FIG. 1B is a schematic plan view of a bit portion of the screwdriver.

FIG. 2A is an enlarged schematic front view of a bit portion of another example of a screwdriver, and FIG. 2B is a schematic plan view of the bit portion of the screwdriver.

FIG. 3 is an enlarged schematic front view of still another example of the screwdriver.

FIG. 4A is an enlarged front view of a bit portion of an example of a screwdriver having a bit having a hexagonal cross section, and FIG. 4B is an enlarged front view of a bit portion of an example of a screwdriver having a cross-shaped bit of a cross section. FIG. 7C is an enlarged front view of a bit portion of an example of a screwdriver having a plate-shaped bit, and FIG.
FIG. 4A is a schematic cross-sectional view showing the engagement state of the anti-slip recess of the bit part shown in FIG. 7A and the screw hole of the screw head, and FIG. 6E is the anti-slip part of the bit part shown in FIG. It is a schematic cross-sectional view showing an engagement state of a recess and a screwdriver hole for a screw head,
FIG. (F) is a schematic cross-sectional view showing the engagement state of the anti-slip recess of the bit portion and the screwdriver hole of the screw head shown in FIG. (C), and FIG. It is a figure which shows the angle which the inner surface of a hole or the contact surface of a bit outer surface makes.

[Explanation of symbols]

A, B, C, A ', B', C'Screwdriver 1 1st screwdriver rotating shaft 11 Tip 12th bit 13 rotation center axis 2 2nd screwdriver rotating shaft 21 Tip 22 2nd bit 23 Center axis of rotation 3 concave groove 4 rotation axes 41 Tip 5 bits 51 Vertical ridge 511 Vertical ridge outer surface 512 groove 6 rotation center axis 7 rotation axis 71 Tip 8 plate bits 81 wide side 811, 812 concave groove 82 Lattice groove 9 central axis 10 Screw head screwdriver hole 101 Inside face of screwdriver hole

Claims (8)

[Claims] 1. A screwdriver having a screwdriver bit formed at a tip of a rotary shaft, the screwdriver bit being engageable with and disengageable from a screwdriver hole provided in a screw head, wherein the screwdriver hole of the screwdriver bit. A plurality of recesses for preventing slippage are engraved on at least a part of an outer surface facing the inner surface of the screwdriver. 2. A screwdriver capable of turning a screw having a hole having a polygonal sectional shape as a screwdriver hole of the screw head, wherein the screwdriver bit has a polygonal sectional shape suitable for the polygonal sectional hole. 2. The screwdriver according to claim 1, wherein the anti-slip recess is formed on at least one outer surface of the bit. 3. A screwdriver capable of turning a screw having a cross-shaped hole in a plan view as a screw-driving hole of the screw head, wherein the screwdriver bit has a cross-shaped cross-section that fits the cross-shaped hole. 2. A screwdriver according to claim 1, which is a bit, and wherein the anti-slip recess is formed on the outer surface of at least one of the vertical ridges of the cross-shaped cross-shaped bit. 4. A screwdriver capable of turning a screw having a linearly extending groove-shaped hole as a screw-driving hole of the screw head, wherein the screwdriver bit is a plate-shaped bit adapted to the groove-shaped hole. The screwdriver according to claim 1, wherein the anti-slip recess is formed on at least one of the wide outer surfaces of the plate-shaped bit. 5. The screwdriver according to claim 1, wherein the anti-slip recess is a recess groove extending in a direction transverse to a rotation center axis of the rotary shaft. 6. The screwdriver according to claim 1, wherein the anti-slip recess is a recess groove extending parallel to a rotation center axis of the rotary shaft. 7. The screwdriver according to claim 1, wherein the plurality of anti-slip recesses are a plurality of recessed grooves that intersect and extend in a grid pattern. 8. The non-slip concave groove extending in a direction transverse to the central axis of the rotary shaft is a surface that is an upper surface portion inside the concave groove and a surface that is a lower surface portion inside the concave groove when the screwdriver bit is directed downward. The lower surface portion has a contact surface of the bit side surface at the lower protruding edge portion of the concave groove which is the outer edge portion of the lower surface portion,
The screwdriver according to claim 5 or 7, wherein the screwdriver is formed to have a right angle or an obtuse angle.