JP2017113832A - Screw holding type driver bit and combination with screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw holding type driver bit capable of being attached by easily and smoothly engaging with a screw bit engagement groove, and securely exhibiting screw holding function at the tip of the driver bit upon screw fastening work, and a combination with a screw.SOLUTION: A combination of a screw 30, where the top face of a screw head 30a is provided with a bit engagement part 32 with a plurality of torque transmission grooves 34 formed to extend, respectively, by separating with equal angle intervals to a circular outer peripheral part, with a driver bit 10 matching with this screw consists of a configuration that, when an engagement salient 12 at the shaft tip 16 of a driver bit is brought in contact with the screw bit engagement part, the tip of an elastic pin 22 provided in a part of the engagement salient comes in contact with a guide opening part 36 formed in the bit engagement part to generate screw holding function by engagement while pressure-welding sequentially into the torque transmission grooves of the bit engagement part.SELECTED DRAWING: Figure 1

Description

  According to the present invention, by improving the structure of the tip of the driver bit, the bit can be easily and quickly fitted into the bit fitting groove provided on the screw head of the screw applied to the driver bit. In screw tightening work, it relates to the combination of a screw holding type screwdriver bit and a screw that can surely exert the screw holding function at the tip of the driver bit, effectively prevent the cam-out phenomenon, and remarkably improve the work efficiency. is there.

  The applicant first comprises a plurality of flat blade portions formed with edge portions that are substantially perpendicular at the tip portion, and the tip center portion of these flat blade portions is configured as a conical protrusion, Cutting out the flat blade portion in the bit axis direction with respect to the flat blade portion, and engraving a long groove as a guide passage of a required length in the continuous shaft portion on substantially the extension of the cut portion of the flat blade portion, From a configuration in which an elastic piece having a screw holding function is inserted and arranged by elastic interaction with the bit fitting groove of the screw head in the long groove and interaction with the flat blade part fitted into the bit fitting groove. Developed and obtained a patent (see Patent Document 1).

  That is, in the screw holding type driver bit described in Patent Document 1, the flat blade portion of the driver bit is cut in the bit axis direction to cut a long groove having a required length, and the screw is inserted into the long groove. Since the elastic piece having a holding function is inserted and arranged relatively easily, manufacturing and maintenance are easy, and when holding on the screw, the flat blade part at the tip of the driver bit is fitted. Therefore, since only the pressure contact elastic force of the elastic piece is used, a reliable and stable screw holding function can be exhibited without the need of using a combination of a suction force by a conventional magnet or air. It is.

  Moreover, in the said patent document 1, as an example of the screw holding type driver bit which consists of the structure mentioned above, and the screw adapted to this, a deformation | transformation hexagon hole (hexarobuler etc.) was provided as a bit fitting groove of a screw head. There has also been proposed a structure comprising a screw and a deformed hexagonal corner so as to match the bit fitting groove of the screw. Therefore, in this type of screw retaining type driver bit, the corner portion of the deformed hexagonal corner portion is cut off in the bit axis direction, and the cut portion of the corner portion is cut off. A deformed hexagonal shape in which a long groove having a required length is formed in a continuous shaft portion on the extension, and elastically abuts against the bit fitting groove of the screw head in the long groove and is fitted into the bit fitting groove. There has also been proposed a structure in which an elastic piece having a screw holding function is inserted and arranged by interaction with the corner portion.

  Conventionally, like a screw provided with a deformed hexagonal hole (such as a hexalobular member) described in Patent Document 1, three or more recessed recesses protruding at an equal angular interval at the screw head are provided. And a screw tightening structure that makes it difficult for the screw tightening tool to come out of the recess, and a screw tightening tool having a torque transmission portion comprising a fitting convex portion that fits into the recess of the screw. (See Patent Document 2).

  However, in the screw tightening structure described in Patent Document 2, the outer peripheral side end portion of the torque transmitting portion of the fitting convex portion of the screw tightening tool is brought into contact with the side wall surface of the torque transmitting portion of the screw recess. Then, the tightening force is transmitted to the screw through the force application point Q that is the contact portion, and in the recess sectional shape or end surface shape perpendicular to the center line O1 of the recess including the force application point Q, When the angle of the surface normal force F perpendicular to the side wall of the recess is inclined from the tangential direction of the force point Q centered on the center line O1, the drive angle θ is directed outward from the tangential direction. Positive is θ ≦ 0 °, and particularly when θ <0 °, the fitting convex portion bites into the recess, and the above effect is remarkable because the cam-out is more appropriately suppressed. It is supposed to be.

  Furthermore, in the related art, a screw tightening system using a screw having a hexalobular insertion port and a tool for use in the screw head at the screw head, particularly a sufficient fit between the tool and the hexalobular screw, A system that realizes a fit has been proposed (see Patent Document 3).

  That is, the screw tightening system described in Patent Document 3 includes: (1) an insertion port of a hexalobular on the upper surface of the head, and an upper portion of the plane of the hexalobular extending below the screw head parallel to or substantially parallel to the screw axis. A screw having a peripheral wall and a corresponding tool; and (2) a transition surface extending downward and inwardly with respect to the lower edge of the upper peripheral wall, and a taper extending downward from the lower edge of the inclined transition surface. (3) the head of the screw has a dimension to be engaged with a tool having a central portion that serves as an upper engaging surface and a lower engaging surface. (4) The upper engagement surface is an angle at which the tool is engaged with the screw shaft, and is slightly sharper than the upper peripheral wall of the screw, and is tapered downward. ) The central part that becomes the lower engaging surface is the surface of the tapered central recess. As "interference fit" is achieved, and so there is no engagement between the transition surface which is inclined at the same angle as the central recess of the screw, it is made of a structure in which a downwardly tapered.

  Therefore, according to the screw fastening system described in Patent Document 3, the screw does not fall off by forming a contact by compression between the central portion of the tool and the central concave portion that is the tip of the screw head. Describes that it is possible to stay in a tool.

Japanese Patent No. 4280457 Japanese Patent No. 5238076 Japanese Patent No. 5133799

  According to the combination of the screw holding type driver bit and the screw described in Patent Document 1 according to the above-mentioned prior application of the present applicant, it has a polygonal shape other than the bit fitting portion formed of a cross groove, which has been difficult in the past. The configuration of the elastic piece having a screw holding function provided at the tip end portion of the shaft of the driver bit when the screw having the bit fitting portion having the polygonal shape is used, although it can be applied to the screw having the bit fitting portion. In the arrangement, when the tip portion abuts on the bit fitting portion provided on the screw head, the tip is pressed against the periphery of the opening edge portion of the bit fitting groove based on the displacement of the elastic piece, There is a difficulty in causing unexpected damage to the screw head surface, and in order to prevent this, if the amount of displacement of the elastic piece is reduced, the elasticity of generating the screw holding function of the elastic piece is reduced. There is a drawback of such to be.

  Further, in the screw tightening structure described in Patent Document 2, the screw tightening tool and the basic structure of the screw have a conventional rail structure, and the outer peripheral side end of the torque transmitting portion of the fitting convex portion in the screw tightening tool. When the tightening torque is transmitted to the screw via the applied force point Q that is the contact portion when the portion contacts the side wall surface of the torque transmission portion of the recess with respect to the screw, the recess at the applied force point Q In the cross-sectional shape or end face shape of the recess perpendicular to the line O1, the driving angle θ of the surface normal force F perpendicular to the side wall of the recess at the applied force is set to a predetermined angle. Producing the screw tightening tool and the screw so as to conform to each other requires precise and cumbersome design and production. It is difficult to growth, there is a drawback of such can not be the tightening of the appropriate screws.

  Furthermore, in the screw tightening system described in Patent Document 3, the screw includes a screw having a hexalobular upper engagement surface on a screw head and a tool corresponding to the screw, and the screw is formed from the upper engagement surface. A tapered central recess is formed via a transition surface that extends downwardly and the tool provides a corresponding central portion, and a “close fit” is realized between the central recess surface of the screw. When manufacturing the tapered central portion of the tool with the tapered central concave portion of the screw, as in the case described above, precise and cumbersome design and manufacture are required, as well as when using the same. If foreign matter or the like enters the fitting portion, it is difficult to achieve a desired purpose, and proper screw tightening work cannot be performed.

  Therefore, as a result of intensive studies and studies to solve the problems related to the combination of the above-described conventional screw and the tool applied thereto, that is, the driver bit, the present inventor has obtained a circular outer peripheral portion on the top surface of the screw head. A screw provided with a bit fitting portion in which a plurality of torque transmission grooves are formed so as to be spaced apart from each other at equal angular intervals, and a plurality of fitting convex portions adapted to the bit fitting portion of the screw. In a combination with a driver bit having a shaft tip formed on the outer peripheral surface of the torque transmission part, the screw bit fitting part has a required width outward along all the opening edges of the plurality of torque transmission grooves. And a guide opening that is inclined downward toward the center of the screw shaft and is formed at the tip of the shaft of the driver bit so as to fit the bit fitting portion of the screw. Partially ablate any one of the fitting convex portion of the formed torque transmitting portion from the tip along the bit axis to form a notch. Next, a protection sleeve is attached so as to surround an outer periphery of the shaft tip portion where the notch portion is formed in a state where the most distal end portion of the shaft tip portion of the driver bit is exposed, and the shaft tip surrounded by the protection sleeve An elastic pin that can be elastically displaced in the radial direction of the shaft portion is inserted into the notch portion of the portion, the tip of the elastic pin exposed from the protective sleeve is positioned slightly rearward from the tip of the notch portion, and the shaft It is set as the structure arrange | positioned so that it may slightly displace to radial direction outward from the outer peripheral surface. And when the fitting convex part in the tip part of the shaft of the driver bit is brought into contact with the bit fitting part of the screw, the tip of the elastic pin provided in a part of the fitting convex part is the bit fitting. To develop a combination of a screw holding type screwdriver bit and a screw that abuts on the guide opening formed in the joint and is inserted into the torque transmission groove of the bit fitting part while being pressed in order to generate a screw holding function. Successful.

  That is, according to the combination of the screw holding type driver bit and the screw having the above-described configuration, it can be manufactured easily and at a low cost with a relatively simple design and configuration, and this kind of special bit. When connecting a screwdriver bit to a screw with a fitting groove, it can be achieved smoothly and efficiently without causing damage to the screw head, and it is possible to ensure that it can fully exert its strong screw holding function. I found it.

  Further, in the combination of the screw holding type screwdriver bit and the screw having the above-described configuration, the elastic pin provided at the tip of the shaft of the screwdriver bit uses a piano wire with a circular section having a high tensile strength and the tip edge thereof. By appropriately chamfering, the tip of the elastic pin can be smoothly brought into contact with the guide opening formed in the bit fitting portion of the screw, and the screw holding type driver bit can be quickly combined. it can.

  Furthermore, as a combination of the screw holding type driver bit and the screw having the above-described configuration, for example, a screw having a hexagonal-buller shape as a torque transmission groove of a bit fitting portion that is currently commercially available in large quantities and a driver bit corresponding to this screw are included. If applied, all the operations and effects described above can be effectively exhibited.

  Accordingly, an object of the present invention is to provide a screw provided with a bit fitting portion in which a plurality of torque transmission grooves are formed so as to extend apart from each other at equal angular intervals on the top surface of the screw head. And a bit fitting provided on the screw head in a combination of a screwdriver bit having a shaft tip formed on the outer peripheral surface with a torque transmitting portion formed of a plurality of fitting convex portions adapted to the bit fitting portion of the screw. To provide a combination of a screw holding type screwdriver bit and a screw that can be easily and smoothly fitted and mounted in a groove, and that can reliably exert a screw holding function at the tip of the driver bit. .

In order to achieve the above object, the combination of the screw holding type driver bit and the screw according to claim 1 of the present invention is separated from the circular outer peripheral portion at equal angular intervals on the top surface of the screw head. Formed on the outer peripheral surface is a torque transmission part consisting of a screw provided with a bit fitting part formed with a plurality of torque transmission grooves to extend and a plurality of fitting projections that fit the bit fitting part of the screw Consisting of a combination with a screwdriver bit with a shaft tip,
Formed on the bit fitting portion of the screw is a guide opening that extends outward along the entire opening edge of the plurality of torque transmission grooves with a required width and is inclined downward toward the center of the screw shaft. And
At one end of the shaft of the driver bit, a fitting convex portion of one of the torque transmission portions formed so as to be fitted to the bit fitting portion of the screw is partially cut out from the tip along the bit axis direction. To form a notch,
In a state where the most distal end portion of the shaft tip portion of the driver bit is exposed, a protective sleeve is attached so as to surround the outer periphery of the shaft tip portion where the notch portion is formed,
An elastic pin that can be elastically displaced in the radial direction of the shaft is inserted into the notch portion of the shaft tip portion surrounded by the protection sleeve, and the tip of the elastic pin exposed from the protection sleeve is slightly behind the tip of the notch portion. And is arranged to be slightly displaced radially outward from the outer peripheral surface of the shaft,
When the fitting convex portion at the tip end portion of the shaft of the driver bit comes into contact with the bit fitting portion of the screw, the tip end of the elastic pin provided at a part of the fitting convex portion is the bit fitting portion. It is configured to abut on the guide opening formed in the above and sequentially fit into the torque transmission groove of the bit fitting portion to generate a screw holding function.

  In the combination of the screw holding type driver bit and the screw according to claim 2 of the present invention, the elastic pin provided at the tip end of the shaft of the driver bit uses a piano wire having a circular section having a high tensile strength, and The tip edge is appropriately chamfered.

  In the combination of the screw holding type driver bit and the screw according to claim 3 of the present invention, the bit fitting portion in which a plurality of torque transmission grooves of the screw are formed has a hexalobular shape.

  The combination of the screw holding type driver bit and the screw according to claim 4 of the present invention is characterized by comprising a driver bit for use as a part thereof.

  The combination of the screw holding type driver bit and the screw according to claim 5 of the present invention is characterized by comprising a screw for use as a part thereof.

  According to the combination of the screw holding type driver bit and the screw according to the first aspect of the present invention, it can be manufactured easily and at a low cost with a relatively simple design and configuration. When connecting a screwdriver bit to a screw with a clear bit fitting groove, it can be achieved smoothly and efficiently without causing damage to the screw head, etc. This can significantly improve the working efficiency of the screw tightening operation.

  According to the combination of the screw holding type driver bit and the screw according to claim 2 of the present invention, when the driver bit is coupled to the screw, the tip of the elastic pin contacts the guide opening formed in the bit fitting portion. As a result, the screw holding type driver bit can be quickly coupled.

  According to the combination of the screw holding type driver bit and the screw according to claim 3 of the present invention, a screw having a hexalobular shape as a torque transmission groove of a bit fitting portion that is currently commercially available in large quantities, and a driver corresponding to this screw By applying it to the bit, all the operations and effects described above can be effectively exhibited.

  According to the screw holding type driver bit according to claim 4 of the present invention, while exhibiting the same excellent screw holding function as described above, the functions and effects obtained by the combination of the screw holding type driver bit and the screw described above are obtained. You can expect enough.

  According to the screw according to claim 5 of the present invention, the excellent screw holding function similar to the above is exhibited, and the operation and effect obtained by the combination of the screw holding type driver bit and the screw are sufficiently expected. be able to.

It is a schematic perspective view which shows the Example of the combination of the screw holding type driver bit and screw which concerns on this invention. It is a principal part top view of the front-end | tip part of the screw holding type driver bit which concerns on this invention shown in FIG. FIG. 3 is a cross-sectional view of the main part of the driver bit shown in FIG. It is a top view of the screw head of the screw corresponding to the screw holding type driver bit concerning the present invention shown in FIG. FIG. 5 is a cross-sectional view of the screw shown in FIG. 4 along the line BB. It is principal part sectional drawing which shows the state which starts the coupling | bonding of the screw holding type driver bit and screw which concern on this invention shown in FIG. It is principal part sectional drawing which shows the coupling | bonding state of the screw holding type driver bit and screw which concern on this invention shown in FIG.

  Next, embodiments of a combination of a screw holding type driver bit and a screw according to the present invention will be described in detail below with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing an exemplary embodiment of a combination of a screw retaining type driver bit and a screw according to the present invention. FIG. 1 is a schematic perspective view showing a main part of a screw holding driver bit 10 and a screw 30 applied to the driver bit 10 according to the present invention. FIGS. 2 and 3 are screw holdings shown in FIG. FIG. 4 and FIG. 5 are a plan view of a screw head showing a detailed configuration of the screw 30 shown in FIG. 1 and a cross-sectional view thereof. It is.

  Accordingly, in FIGS. 1 to 3, the screw holding type driver bit 10 according to the present invention has a torque transmitting portion 14 formed of a plurality of fitting convex portions 12 adapted to a bit fitting portion 32 of a screw 30 described later as an outer peripheral surface. It has the structure which has the shaft front-end | tip part 16 formed. In the illustrated example, a screw holding type driver bit 10 having a torque transmitting portion 14 having a hexalobular shape having six fitting convex portions 12 is shown.

  In this shaft front end portion 16, any one of the fitting convex portions 12 of the torque transmitting portion 14 formed so as to fit the bit fitting portion 32 of the screw 30 is partially extended from the front end along the bit axis direction. The notch 18 is formed by cutting. The front end portion 16a of the shaft front end portion 16 is attached with a protective sleeve 20 so as to surround the outer periphery of the shaft front end portion 16 on which the cut portion 18 is formed, and is further exposed. An elastic pin 22 is inserted and arranged so as to be elastically displaced in the radial direction of the shaft with respect to the notch 18 of the shaft tip 16 surrounded by 20.

  In this case, the tip 22a of the elastic pin 22 exposed from the protective sleeve 20 is positioned slightly rearward from the tip of the notch 18 and positioned so as to be slightly displaced radially outward from the outer peripheral surface of the shaft. .

  1, 4, and 5, the screw 30 according to the present invention is equiangular with the circular outer peripheral portion on the top surface of the screw head 30 a. The bit fitting portion 32 having a plurality of torque transmission grooves 34 formed so as to extend outward in the radial direction and spaced apart from each other is provided. In the illustrated example, a screw 30 having a bit fitting portion 32 having a hexalobular shape having six torque transmission grooves 34 is shown.

  Then, the bit fitting portion 32 of the screw 30 is extended outward along the full opening edge 34a of the plurality of torque transmission grooves 34 with a required width and directed downward toward the center portion of the screw shaft. It consists of the structure which formed the guide opening part 36 which inclines.

  In addition, in the screw holding type driver bit 10 and the screw 30 having the above-described configuration, the center part of the tip of the shaft tip part 16 of the screw holding type driver bit 10 to be coupled to each other and the bit fitting part 32 of the screw 30 are provided. By configuring the central bottom surface portion as shown in FIGS. 1 to 5, the coupling operation in the screw tightening operation can be performed easily and appropriately and quickly.

  That is, in the screw holding type driver bit 10, the central portion of the shaft tip portion 16 from the peripheral edge of the cylindrical portion corresponding to the inscribed circle of each fitting convex portion 12 forming the torque transmission portion 14 of the shaft tip portion 16. It is configured as a tip protrusion 24 that protrudes in a concave curved shape toward the top and has a tip protruding in a conical shape.

  On the other hand, in the screw 30, a convex curved shape is directed toward the center of the bit fitting portion 32 from the peripheral edge of the cylindrical portion corresponding to the inscribed circle of each torque transmission groove 34 of the bit fitting portion 32. The central part is formed as a central bottom part 38 formed in a conical concave part.

  Accordingly, when the screw holding driver bit 10 having the above-described configuration is screwed using the screw 30 having the above-described configuration, as shown in FIG. The tip of the shaft tip 16 can be made to face the bit fitting portion 32 of the screw 30. In other words, in this case, each of the fitting convex portions 12 of the torque transmitting portion 14 formed on the shaft tip portion 16 of the screw holding type driver bit 10 is replaced with each torque transmitting groove 34 formed on the bit fitting portion 32 of the screw 30. Can be opposed to each other.

  In this case, the tip portion 22a of the elastic pin 22 provided at the shaft tip portion 16 does not initially contact the surface of the screw head 30a of the screw 30, and the shaft tip of the screw holding type driver bit 10 is not contacted. As shown in FIG. 6, the end portions of the elastic pins 22 are formed by fitting the fitting protrusions 12 in the portion 16 to the torque transmission grooves 34 in the bit fitting portion 32 of the screw 30. 22 a comes into contact with the guide opening 36 provided in the bit fitting portion 32 of the screw 30.

  In this manner, the screw holding type driver bit 10 shaft tip portion 16 is inserted into the bit fitting portion of the screw 30 with the tip portion 22a of the elastic pin 22 in contact with the guide opening 36 of the screw 30. When inserted into the pin 32, the elastic pin 22 smoothly moves while its tip end portion 22a maintains elasticity in the radially outward direction along the inclined surface of the guide opening 36, as shown in FIG. In addition, the screw 30 can be securely fitted into any torque transmission groove 34 in the bit fitting portion 32 of the screw 30.

  Therefore, according to the combination of the screw holding type driver bit and the screw according to the present invention having the above-described configuration, it can be manufactured easily and at a low cost with a relatively simple design and configuration. When connecting a screwdriver bit to a screw with a special bit fitting groove, it can be achieved smoothly and efficiently without causing damage to the screw head, etc., and it can be sure to exert its strong screw holding function sufficiently. The working efficiency in this type of screw tightening operation can be significantly improved.

  The preferred embodiment of the present invention has been described above. However, the screw holding type driver bit according to the present invention is not limited to the above-described embodiment, and, for example, a torque including five or three fitting protrusions. It can also be configured as a screw holding type driver bit having the transmission portion 14. Further, the screw applied to the screw holding type driver bit is not limited to the above-described embodiment, and may be configured as a screw having a bit fitting portion including, for example, five or three torque transmission grooves. . In addition, it goes without saying that various design changes and the like can be made without departing from the spirit of the present invention in the shape, configuration, and the like of the screw holding type driver bit and various parts as the screw.

DESCRIPTION OF SYMBOLS 10 Driver bit 12 Fitting convex part 14 Torque transmission part 16 Shaft front-end | tip part 16a Cutting edge part 18 Notch part 20 Protection sleeve 22 Elastic pin 22a Tip part 24 Tip protrusion part 30 Screw 30a Screw head 32 Bit fitting part 34 Torque transmission Groove 34a Opening edge 36 Guide opening 38 Central bottom surface

Claims (5)

On the top surface of the screw head, a screw provided with a bit fitting portion formed with a plurality of torque transmission grooves so as to extend apart from each other at equal angular intervals with respect to the circular outer peripheral portion, and a bit fitting of the screw It consists of a combination with a driver bit having a shaft tip formed on the outer peripheral surface of a torque transmission part consisting of a plurality of fitting convex parts that fit the joint part,
Formed on the bit fitting portion of the screw is a guide opening that extends outward along the entire opening edge of the plurality of torque transmission grooves with a required width and is inclined downward toward the center of the screw shaft. And
At one end of the shaft of the driver bit, a fitting convex portion of one of the torque transmission portions formed so as to be fitted to the bit fitting portion of the screw is partially cut out from the tip along the bit axis direction. To form a notch,
In a state where the most distal end portion of the shaft tip portion of the driver bit is exposed, a protective sleeve is attached so as to surround the outer periphery of the shaft tip portion where the notch portion is formed,
An elastic pin that can be elastically displaced in the radial direction of the shaft is inserted into the notch portion of the shaft tip portion surrounded by the protection sleeve, and the tip of the elastic pin exposed from the protection sleeve is slightly behind the tip of the notch portion. And is arranged to be slightly displaced radially outward from the outer peripheral surface of the shaft,
When the fitting convex portion at the tip end portion of the shaft of the driver bit comes into contact with the bit fitting portion of the screw, the tip end of the elastic pin provided at a part of the fitting convex portion is the bit fitting portion. A screw holding type driver bit, wherein the screw holding function bit is configured to abut on the guide opening formed in the above and sequentially fit into the torque transmission groove of the bit fitting portion while being press-fitted. And combination with screws.   2. The screw holding type screwdriver according to claim 1, wherein the elastic pin provided at the tip of the shaft of the driver bit uses a piano wire having a circular section having a high tensile strength, and the tip edge thereof is appropriately chamfered. Combination with bit and screw.   The combination of a screw holding type screwdriver bit and a screw according to claim 1 or 2, wherein the bit fitting portion formed with a plurality of torque transmission grooves of the screw has a hexalobular shape.   A screwdriver bit for use as part of a combination of a screw retaining screwdriver bit and a screw according to any one of claims 1 to 3. A screw for use as part of a combination of a screw retaining screwdriver bit and a screw according to any one of claims 1 to 3.

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