JPH0719719Y2 - Driver bit - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hexagon socket head bolt, a driver bit used for turning a screw part such as a set screw, and more specifically, when the bit is fitted to a tool such as a wrench socket. Regarding the driver bit that is supposed to be held securely.

[0002]

2. Description of the Related Art Conventionally, as a rotary tool for a screw part such as a hexagon socket head cap, a hexagonal bar spanner in which a rod rod having a hexagonal cross section is bent into an L shape so that a part thereof serves as a grip is widely used. However, this hex wrench usually requires several spanners of different sizes to be used as a set, as the size of the hexagonal hole in the threaded screw part must be changed to another spanner each time. It is being done.

Therefore, in order to deal with such inconvenience and uneconomical, a driver bit 1 as shown in FIG. 3 corresponding to the tip end portion of the hexagonal spanner is used. That is, the bit 1 is obtained by processing the front half of the bit body 2 made of hexagonal material of an appropriate length into the engaging portion 3 that can be fitted into the hexagonal recess of the screw component. It is necessary to use a rotating tool such as a spectacle wrench, other spanner, monkey wrench, but when replacing it according to the size of the screw part, it is convenient to replace only the bit held at the tip of the tool .

By the way, the bit 1 made of the above hexagonal material
Can be used by directly holding the main body 2 with a wrench or the like, but usually, the bit main body 2 is used as a rotating tool as shown in FIG. 4, for example, a core body 4 of a dedicated wrench 4 for hand rotation. It is adapted to be used by fitting (fitting) it into the polygonal engaging hole 6 of the socket 5 connected to the '. When the socket 5 for the bit is used, the bit 1 fitted to the socket is used. So as not to come out naturally, one of the engaging holes 6 of the polygonal socket 5 and the facing surface of one of the bits 1 is biased outward by a bullet 7 as shown in FIG. The retaining means by the ball 8 is adopted.

[0005]

The retaining ball 8 may be provided on either the socket 5 or the bit 1, but when the socket 5 is provided on the crocodile, the bit 1 is not provided. Although it is not necessary to provide it, on the other hand, if the bit itself is not provided with the above-mentioned retaining ball, the bit may be grasped by a monkey wrench or the like so that the hexagonal portion of the main body 2 is directly sandwiched and used. When the bit 1 is used while being fitted and held in the hexagonal hole of a double-ended wrench or an eyeglass wrench, the bit does not have a retaining ball and the bit comes out of the wrench during use. Therefore, in the past, in most cases, the above-mentioned retaining ball 8 is provided in the bit 1 on the crocodile.

However, the above-mentioned ball 8 is bit 1
If this is done, the hardening hardness of the bit will be somewhat inferior to that of the bit not provided with the retaining ball 8. The reason is that the bit 1 is hardened so that the bit 1 has an appropriate hardness after the forming process. However, when the bit 1 is provided with the retaining ball 8, the ball 8 is provided as shown in FIG. After being inserted into the required hole 9 following the bullet 7, the deformation (constriction) processing is performed to reduce the diameter of the inlet 9'of the hole 9 so that the ball does not fly out. However, the deformation of the inlet 9'is performed after the quenching step of the bit. Therefore, if the inlet 9'is hardened, cracks and chips will occur in the mouth during the deformation of the inlet 9 '. Of. For this reason, the bit 1 provided with this type of ball 8 has a slightly weakened quenching hardness as compared with a bit not provided with a ball. For this reason, the bit provided with the ball has a low overall hardness and is used for a long period of time. At this time, the engaging portion 3 is easily deformed.

According to the present invention, in providing the retaining means for the socket 5 on the bit, it is possible to reduce the hardness of the bit without using a ball which requires a deformation process after quenching as in the conventional example. The purpose is to provide it by means that does not exist.

[0008]

The driver bit of the present invention has a regular polygonal cross section in which one end of the shaft portion is an engaging portion for a screw part and has a regular shape of a bit body. A peripheral groove having an appropriate depth is formed on the outer periphery of the polygon, and an outer diameter of the O is projected into the peripheral groove from the opposite side portion of the polygon to the outside, and the diameter of the O is smaller than the diagonal portion. The feature is that the ring is fitted.

[0009]

The driver bit of the present invention is held by fitting the polygonal bit body in the socket attached to the ratchet type other bit dedicated wrench in the axial direction, and the hexagonal hole by the engaging part at one end of the body. It is used by inserting it into the hole of screw parts such as stud bolts and setscrews. The driver bit is external from each opposite side surface of the main body where the O-ring fitted to the outer periphery of the bit main body has a polygonal shape. Since the outer peripheral portion of the protruding O-ring is in close contact with the inner surface of the socket facing the socket, friction acts to prevent the socket from coming off from the socket.

Further, since the driver body has an O-ring for preventing the driver body from coming off, the driver body can be used as a double-ended wrench or an eyeglass wrench without using the socket dedicated to the driver bit. It can also be used while being inserted and held in the polygonal hole-shaped fitting hole, and in this case, since the bit is provided with the O-ring described above, it does not come out of the wrench naturally. Further, the driver bit of the present invention can be used by grasping the opposite side portion by directly sandwiching it with a spanner, a monkey wrench or the like.

Further, according to the present invention, since the peripheral groove for fitting the O-ring is formed and then quenching is performed (the cutting, deformation and the like are not performed after quenching), sufficient quenching hardness can be provided. Of. Since the outer circumference of the O-ring is housed within the diagonal part of the bit body, a large force applied to the diagonal part does not directly act on the O-ring when the screw part is rotated, so that the O-ring is not damaged early. It can be avoided.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings.

In FIGS. 1 and 2, 11 is a driver bit, which is formed by cutting a regular hexagonal bar to an appropriate length and has a small diameter in the front half of the axial direction of a bit body 12 for rotating a screw part. The engaging portion 13 is provided. Numeral 14 is an O-ring fitted in the peripheral groove 15 formed around the entire middle of the bit body near the outer end of the bit body 12 and the outer diameter of the O-ring 14 is the peripheral groove. The outer circumference 14 'of the O-ring protrudes in an arc shape from the opposite side (a) of the regular polygonal bit main body by appropriately determining the depth of the O-ring, and inside the diagonal (b). It is designed to fit. Although the cross section of the bit main body 12 shows a regular hexagon in the illustrated example, it may be a quadrangle, and the tip shape of the engaging portion 13 is not limited to the hexagon shown, and may be a dozen or one letter, or It may have a ball point shape, a positive drive shape, or any other shape.

In the driver bit 11 having the above-mentioned structure, the bit body 12 is fitted and held in the engaging hole 6 of the socket 5 fitted to the core body 4'of the rotary tool 4 as shown in FIG. It is used for the rotation of the screw component by the engaging portion 3 of. However, the driver bit 11 corresponds to the socket 4
When the O-ring 14 is fitted inside, the outer circumference of a part of the O-ring 14 fitted in the circumferential groove 15 of the bit main body 12 is brought into contact with the contact surface of the socket 5, so that the O-ring 14 is rubbed from the socket 5. It will be retained. The O-ring 14 has a bit body 1 having a circumferential groove 15 on the outer circumference.
Projected outward from the opposite side (b) of 2 and its diagonal (b)
Since it does not protrude from the above, a strong force that mainly acts on the diagonal portion (b) of the bit body 12 when the screw part is rotated is not directly applied to the O-ring portion in the diagonal portion.

Further, the driver bit 11 can be used by holding the body 12 of the bit in the fitting hole of a spanner or a spectacle wrench without using the socket 4 described above, and can also be used for a monkey or the like. It can be used by directly sandwiching the contact surface.

[0016]

[Effects of the Invention] According to the present invention, the driver bit can be fitted into the socket without rattling, and the conventional ball and ammunition can be used to prevent the driver bit from coming off and the ball can be inserted. Fewer parts compared to the one that deforms the mouth entrance later,
In addition, the structure is simple and can be supplied at low cost, and since there is no need to perform deformation processing after quenching, quenching hardness can be sufficiently increased. In addition, since a part of the O-ring to which a great force is applied when the driver bit is rotated is housed in the diagonal part of the bit body, the O-ring is less damaged, and the driver bit uses a dedicated socket. Besides, it can also be used with eyeglass wrenches and spanners.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a driver bit according to the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a front view of a conventional driver bit.

FIG. 4 is a sectional view of a socket for rotating a bit.

FIG. 5 is a cross-sectional view of a conventional example of a bit retaining portion.

[Explanation of symbols]

 11 Driver Bit 12 Bit Main Body 13 Engagement Part 14 O-ring 15 Circumferential Groove 5 Socket

Claims (1)

[Scope of utility model registration request] 1. A regular polygonal outer periphery of a bit main body in which one end of a shaft portion is used as an engaging portion for a screw part and which has a regular polygonal shape. It is characterized in that a groove is formed, and an O-ring having a diameter that fits inward of the diagonal portion is fitted into the circumferential groove while the outer diameter is projected outward from the opposite side portion of the polygon. Driver bit.