# US 2019/0376548 A1 · External thread member > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0376548 A1 - Document ID: US20190376548A1 - Status: Published application - Kind: A1 - Application number: 16/470,972 - Filed: 2017-11-20 - Published: 2019-12-12 - Earliest claimed: 2016-12-19 - Assignees: Topura Co., Ltd. - Applicants: Topura Co., Ltd. - Inventors: Kuninori MATSUMOTO; Mayumi MATSUNO - Web page: https://patentgrep.com/patent/US20190376548A1 ## CPC - F16B 19/02: Bolts or sleeves for positioning of machine parts, e.g. notched taper pins, fitting pins, sleeves, eccentric positioning rings - F16B 39/26: with spring washers fastened to the nut or bolt-head - F16B 5/0241: {with the possibility for the connection to absorb deformation, e.g. thermal or vibrational} - F16B 5/0258: {using resiliently deformable sleeves, grommets or inserts (F16B43/001 takes precedence)} - F16B 25/00: Screws that cut thread in the body into which they are screwed, e.g. wood screws {(F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283)} - F16B 41/002: {Measures against loss of bolts, nuts or pins (devices for fastening nuts to surfaces F16B37/04)} - F16B 2200/83: Use of a magnetic material - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) ## Abstract An external thread member capable of performing a fastening operation efficiently without increasing the number of parts by assembling a collar into the external thread member. The external thread member 1 includes a shaft portion 5 inserted into a mounting hole 105 of a mounting member 101 through a collar 7, and the mounting member 101 is fastened to a fastening member 102. The shaft portion 5 includes a threaded portion 51 and a neck portion 52. The collar 7 is mounted on the neck portion 52 so as to be rotatable relative to each other and is engaged with the threaded portion 51 whereby retention is achieved. A counterbore hole 106 is formed in an opening close to the mounting hole 105 of an internal thread hole 104 with a tubular portion 71 inserted into the mounting hole 105 of the collar 7. ## Claims ### Claim 1 An external thread member including a shaft portion having a threaded portion and a head portion, in which the shaft portion is inserted into a mounting hole of a mounting member through a collar and the mounting member is fastened to a fastening member, wherein the collar is integrally assembled into the shaft portion, the collar includes a tubular portion and a flange portion formed at one end of the tubular portion, and the flange portion is in direct contact with an opening edge of a mounting hole of the mounting member, and when an internal thread hole corresponding to the mounting hole is formed in the fastening member to which the mounting member is attached, and a counterbore hole is formed at an opening close to the mounting hole of the internal thread hole, an axial length of the tubular portion inserted into the mounting hole of the collar is larger than a sum of an axial length of the mounting hole and a depth of the counterbore hole by an amount corresponding to a difference between an amount of elongation of the collar and an amount of elongation due to thermal expansion of the mounting member and the fastening member at a highest temperature of an expected service environment. ### Claim 2 An external thread member including a shaft portion having a threaded portion and a head portion, in which the shaft portion is inserted into a mounting hole of a mounting member through a collar and the mounting member is fastened to a fastening member, wherein the collar is integrally assembled into the shaft portion, the collar includes a tubular portion and a flange portion formed at one end of the tubular portion, and the flange portion is in direct contact with an opening edge of a mounting hole of the mounting member, and when an insertion hole corresponding to the mounting hole also passes through the fastening member, and an internal thread member to which the threaded portion of the external thread member is screwed is disposed at an opening of the insertion hole, an axial length of the tubular portion of the collar is larger than a sum of an axial length of the mounting hole and an axial length of the insertion hole by an amount corresponding to a difference between an amount of elongation of the collar and an amount of elongation due to thermal expansion of the mounting member and the fastening member at a highest temperature of an expected service environment. ### Claim 3 (depends on 1) The external thread member according to claim 1, wherein the shaft portion includes a non-threaded neck portion between the threaded portion and the head portion, and the collar is mounted on the neck portion so as to be rotatable relative to each other. ### Claim 4 (depends on 3) The external thread member according to claim 3, wherein an inner diameter of the collar is larger than an outer diameter of the neck portion and is smaller than an outer diameter of the threaded portion, and retention of the collar is achieved by the threaded portion. ### Claim 5 (depends on 1) The external thread member according to claim 1, wherein a locking means that restricts rotation relative to the mounting member is provided in the collar. ### Claim 6 (depends on 5) The external thread member according to claim 5, wherein the locking means is a tapered surface, which bites into an inner circumference of the mounting hole, on an outer circumferential surface of the collar. ### Claim 7 (depends on 5) The external thread member according to claim 5, wherein the locking means is an uneven portion formed on an outer circumferential surface of the collar. ### Claim 8 (depends on 5) The external thread member according to claim 5, wherein the locking means is configured as a flexibly deformable flange portion having a spring property formed at the collar, and the flange portion is pressure-welded to a periphery of the mounting hole of the mounting member in a flexibly deformed state. ### Claim 9 (depends on 1) The external thread member according to claim 1, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 10 (depends on 2) The external thread member according to claim 2, wherein the shaft portion includes a non-threaded neck portion between the threaded portion and the head portion, and the collar is mounted on the neck portion so as to be rotatable relative to each other. ### Claim 11 (depends on 2) The external thread member according to claim 2, wherein a locking means that restricts rotation relative to the mounting member is provided in the collar. ### Claim 12 (depends on 3) The external thread member according to claim 3, wherein a locking means that restricts rotation relative to the mounting member is provided in the collar. ### Claim 13 (depends on 4) The external thread member according to claim 4, wherein a locking means that restricts rotation relative to the mounting member is provided in the collar. ### Claim 14 (depends on 2) The external thread member according to claim 2, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 15 (depends on 3) The external thread member according to claim 3, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 16 (depends on 4) The external thread member according to claim 4, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 17 (depends on 5) The external thread member according to claim 5, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 18 (depends on 6) The external thread member according to claim 6, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 19 (depends on 7) The external thread member according to claim 7, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion. ### Claim 20 (depends on 8) The external thread member according to claim 8, wherein the external thread member is a tapping screw including a tapping screw portion in which an internal thread is formed in a prepared hole at an end of the shaft portion.