Abstract: A female thread member capable of preventing seizing caused by inclined insertion, and being smoothly fastened from any directions in which a bolt is inserted, and a fastening member using the female thread member. A non-thread portion is formed on an inner peripheral surface of a female thread member body having a female thread for a length corresponding to at least one pitch from an end surface on a bolt-inserting side, and a projection which comes into contact with a flank surface of a male thread of an inserted bolt is formed on a line extending from a helical line of the female thread. The female thread member is used in combination with the bolt having no incomplete thread portion, and there is no adverse possibility of seizing regardless of any directions in which the bolt is inserted.

Abstract: To provide an anti cross-thread bolt which prevents itself from being cross-threaded without the need for correcting its posture by a pilot portion. The bolt is screwed into a female screw having a nominal diameter D and an inner diameter D1. At the tip of a regular thread part 11 formed on a bolt shank, a small-diameter thread part 12 is formed by one pitch or more, the small-diameter thread part having an outer diameter d which is larger than an inner diameter D of the female screw and smaller than (D+D1)/2. When the bolt is obliquely screwed into the female screw, the small-diameter thread part 12 is brought into contact with the female screw at one point, but the bolt is allowed to rotate around the point. Thus, the occurrence of cross-threading is prevented.

Abstract: In a bolt of the present invention, a guide portion having a small diameter is formed at the distal end of a shaft portion and ridge having an inverted direction screw configuration relative to the ridge formed on a constant diameter portion is formed. When the bolt is inserted obliquely into a nut and the ridge gets into engagement with a female screw portion of the nut, an effect of floating the bolt is generated, and the bolt cannot be driven into the nut unless it is set in an appropriate tightening posture. Consequently, biting and seizing of the bolt to the nut can be prevented securely. If the ridge is formed into a double threaded screw having an inverted direction screw configuration, the effect can be further intensified.

Abstract: A hook attaching unit in accordance with the invention is constituted by a hook member which is rotatably attached to an end portion of a base plate, a bolt with a flange inserted to a bolt insertion hole of the base plate, and a resin cover member in which a cover body is connected to an annular basement portion. Since the hook member, the cover member and the bolt are integrally assembled, it is not necessary to install the bolt separately in the work field and then install the cover member after attaching the hook, and as such, the workability at the time of fastening is improved. Further, since the cover member invisibly covers the bolt head portion, improved safety and outer appearance is obtained. The hook attaching unit can be also utilized for attaching a seat belt anchor plate.

Abstract: A fastening device, including: a sleeve 20 fixed to a first member 40; a bolt 1; and a movable spacer 10 that is engaged with a male screw portion 4 of the bolt 1 to be detachable upon receiving a transmission torque exceeding a predetermined value, and moves to a position coming into contact with a second member 50 distanced from the first member as a result of rotating while mating with the reversal screw portion 22 of the sleeve 20 upon receiving the rotational torque from the bolt 1. On the inner peripheral surface of the movable spacer 10, an elastic body layer 15 which elastically deforms when engaged with the male screw portion 4 of the bolt 1 to exhibit a torque transmitting function and a pitch deviation absorbing function is formed.

Abstract: In a bolt of the present invention, a guide portion (116) having a small diameter is formed at the distal end of a shaft portion (15) and ridge (31) having an inverted direction screw configuration relative to the ridge (30) formed on a constant diameter portion (115) is formed. When the bolt (1) is inserted obliquely into a nut (100) and the ridge (31) gets into engagement with a female screw portion (105) of the nut (100), an effect of floating the bolt (1) is generated, and the bolt 1 cannot be driven into the nut 100 unless it is set in an appropriate tightening posture. Consequently, biting and seizing of the bolt 1 to the nut can be prevented securely. If the ridge (31) is formed into a double threaded screw having an inverted direction screw configuration, the effect can be further intensified.

Abstract: A fastening device permitting two separate members to be fixed together with a relative interval between them including a bolt with a male screw portion formed at a front end side of a cylindrical shaft portion thereof and a spacer having a female screw portion engaging a male screw portion and screw-fastens with a screw of a first member side and rotates while receiving a rotation torque from the bolt and moves up to a position in which it comes into a contact with a second member. The root diameter of a male screw portion is smaller than the diameter of a cylindrical shaft portion while the inside diameter of the female screw portion is larger than the diameter of the cylindrical shaft portion. Consequently, the cylindrical shaft portion can be passed through the female screw portion even if the diameter of the cylindrical shaft portion is not reduced in diameter by cutting processing.

Abstract: The invention provides a fastening method and a fastening tool which can stably fasten a nut to a bolt securely and with a small dispersion at a desired axial force. A fastened member (20) is fastened by inserting a bolt (21) to the fastened member (20), thereafter temporarily fastening a nut (22) and the bolt (21), pulling a leading end (21b) of a shaft portion (21c) of the bolt (21) in an axial direction of the bolt (21), rotating the nut (22) so as to screw into the bolt (21) while elastically deforming the bolt (21) so as to generate an axial force, and thereafter canceling the pulling of the bolt (21).

Abstract: A fixing tool for fixing an object to be fixed against an opponent member upon pinioning includes a male screw member screwed into a female screw portion formed on the opponent member side and a pinion member for pinioning the object to be fixed in the opponent direction. The male screw member includes a first axis portion formed with a male screw and a head portion having a non-circular contour formed at an upper end of the first axis portion. The pinion member includes a through hole into which the first axis portion of the male screw portion is inserted, seat portions that are formed inside of the through hole at which the head portion of the male screw member is seated, and engaging portions that pinch the head portion between the seat portions for engaging the head portion in a detachable manner.

Abstract: A hook attaching unit in accordance with the invention is constituted by a hook member in which a hook is rotatably attached to an end portion of a base plate, a bolt with flange inserted to a bolt insertion hole of the base plate, and a resin cover member in which a cover body is connected to an annular basement portion. Since the hook member, the cover member and the bolt are integrally assembled, it is not necessary to install the bolt point by point in a work field and install the cover member after attaching the hook, and a workability at a time of fastening is good. Further, since the cover member invisibly covers a bolt head portion, there can be obtained an effect that a safety and an improved outer appearance can be obtained. The hook attaching unit can be also utilized for attaching a seat belt anchor plate.

Abstract: A tapping screw fastened to a subject member in which a thread portion formed in a shaft portion of the tapping screw is used to form a female screw thread in a prepared hole of the subject member. An angle of a thread ridge is approximately 30 degrees, a plurality of notches are formed in a top portion of the thread portion over a predetermined range of an entire length of the shaft portion, and a joint portion for connecting the top portion and a bottom portion of the thread portion is formed to have a circular arc shape in an area having a smaller diameter than a diameter of the prepared hole of the subject matter, as viewed in a cross section including a shaft center of the tapping screw.

Abstract: A fixing tool for fixing an object to be fixed against an opponent member upon pinioning includes a male screw member screwed into a female screw portion formed on the opponent member side and a pinion member for pinioning the object to be fixed in the opponent direction. The male screw member includes a first axis portion formed with a male screw and a head portion having a non-circular contour formed at an upper end of the first axis portion. The pinion member includes a through hole into which the first axis portion of the male screw portion is inserted, seat portions that are formed inside of the through hole at which the head portion of the male screw member is seated, and engaging portions that pinch the head portion between the seat portions for engaging the head portion in a detachable manner.

Abstract: A tapping screw fastened to a subject member in which a thread portion formed in a shaft portion of the tapping screw is used to form a female screw thread in a prepared hole of the subject member. An angle of a thread ridge is approximately 30 degrees, a plurality of notches are formed in a top portion of the thread portion over a predetermined range of an entire length of the shaft portion, and a joint portion for connecting the top portion and a bottom portion of the thread portion is formed to have a circular arc shape in an area having a smaller diameter than a diameter of the prepared hole of the subject matter, as viewed in a cross section including a shaft center of the tapping screw.

Abstract: A resin bracket comprising a mount portion mounted to a member being mounted and an extending portion extended from the mount portion, wherein a ball joint with a substantially spherical-shaped portion is provided integrally on the extending portion. An opening/shutting mechanism having two resin brackets, wherein each of brackets is mounted members being mounted to be opened and closed.

Abstract: The present invention relates to a method of baking treatment of steel product parts using a high frequency or ultra-high frequency for preventing delayed fracture from occurring due to diffusive hydrogen occluded in steel parts, for example, screws, bolts and the like, or for heating surface layers of the steel parts to generate a difference in temperature between the surface layers and interiors of the steel parts, thereby causing distortion in lattices, wherein the surface layers of the steel parts are rapidly heated to 100 to 300° C. with a high frequency or ultra-high frequency at 10 KHz or higher to remove the diffusive hydrogen which is involved in hydrogen embrittlement, or to transfer an existing state to non-diffusive hydrogen which is not involved in the hydrogen embrittlement.

Abstract: This invention concerns a fastening device which enables two separate members to be fixed together with a relative interval between them and comprises a bolt 1 in which a male screw portion is formed at a front end side of a cylindrical shaft portion 3 thereof and a spacer 10 which has a female screw portion 15 engaging a male screw portion 4 of the bolt 1 and screw-fastens with a screw of the first member 40 side and rotates while receiving a rotation torque from the bolt 1 and moves up to a position in which it comes into a contact with a second member 50. The feature of this invention is that the root diameter of a male screw portion 4 of the bolt 1 is smaller than the diameter of a cylindrical shaft portion 3 while the inside diameter of the female screw portion 15 of the spacer 10 is larger than the diameter of the cylindrical shaft portion 3 of the bolt 1.

Abstract: A bolt is provided with a head part and a shank part. The shank part includes a first constant diameter cylindrical part, a transition part, a cylindrical connection part, and a second constant diameter cylindrical part concentrically extending from the first constant diameter cylindrical part to the second constant diameter cylindrical part. The first constant diameter cylindrical part has a screw thread with a predetermined pitch formed on the side surface thereof. The transition part has a tapered shape and has a screw thread with a predetermined pitch formed on the side surface thereof. The cylindrical connection part has a diameter smaller than that of the first constant diameter part. The second constant diameter cylindrical part has a diameter smaller than the first constant diameter part, and has a screw thread with a predetermined pitch formed on the side surface thereof. The crest part of the screw thread formed on the side surface of the transition part is truncated.

Abstract: A fastener for members (M1, M2) to be clamped with a certain spacing therebetween includes a nut (10); a bolt (40); and a moveable collar (20) having in an inner bore thereof a torque transmitting device capable of transmitting torque of the bolt, which is axially inserted into the inner bore, to the movable collar through thread—thread engagement, and wherein a portion of the thread of the bolt includes special thread ridges (422), by which a frictional force is imparted to the thread—thread engagement.

Abstract: The invention relates to a bolt for integrally fastening a first member and a second member, which are spaced away to each other, the bolt comprising a cylindrical-shaped collar bolt provided on a portion of an outer peripheral surface thereof with an external thread portion and on an inner peripheral surface thereof with an internal thread portion; and a bolt body having in an area of one end of a shank an external thread portion capable of threading into the internal thread portion of the collar bolt and a head on the other end thereof.

Abstract: A fastening position adjustable bolt is provided which includes a bolt body and a cylindrically shaped collar bolt. The bolt body has a head, a shank, and first male threads formed on a lower outer peripheral surface of the shank, and the collar bolt has second male threads formed on an upper outer peripheral surface thereof. An engaging portion engages the shank of the bolt body with the collar bolt. The engaging portion is disposed between the head of the bolt body and a position on the shank at which the first male threads are formed, and the engaging portion is adapted to release engagement between the collar bolt and the shank of the bolt body upon application of a torque having at least a predetermined value.