# US 2018/0023615 A1 · Female threaded body, and threaded body fastening structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0023615 A1 - Document ID: US20180023615A1 - Status: Published application - Kind: A1 - Application number: 15/534,947 - Filed: 2015-12-10 - Published: 2018-01-25 - Earliest claimed: 2014-12-10 - Assignees: NejiLaw Inc. - Applicants: NejiLaw inc. - Inventors: Hiroshi Michiwaki - Web page: https://patentgrep.com/patent/US20180023615A1 ## CPC - F16B 39/286: caused by saw cuts - F16B 37/00: Nuts or like thread-engaging members {(specially shaped for rotations by a tool F16B23/00)} - 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 A female threaded body (100) is provided with: a female threaded helical structure (114) formed on the inner circumferential surface of a hole (106a) in a cylindrical member (106); a contact surface (110a) formed on an axial direction end face of said cylindrical member (106); and a reverse rotation-preventing member (160), which has a protruding section (168) that is disposed and fixed on said contact surface (110a) and protrudes radially inward toward the rotation axis and in which the tip of said protruding section (168) configures an engaging edge (168a) that forms a continuous or discontinuous helix of a different lead angle and/or lead direction from the lead angle and/or lead direction of the female threaded helical structure (114). The engaging edge (168a) may allow a relative rotation of a male thread body (10) and the female threaded helical structure (114) in one direction. ## Claims ### Claim 1 A female threaded body comprising: a female threaded helical structure formed on an inner circumferential surface of a hole of a cylindrical member and set at a lead angle and/or in a lead direction; a receiving portion including a contact surface formed on an end surface of the cylindrical member in an axial direction of the hole; and a reverse rotation-preventing member disposed on the contact surface and including a protruding portion extended in a radially inward direction towards an axis, wherein a protruding end of the protruding portion includes a disconnected or connected helical engaging edge that is set at a lead angle and/or in a lead direction different from the lead angle and/or the lead direction of the female threaded helical structure, wherein the engaging edge is elastically deformed to rotate on a base end of the protruding portion as a supporting point in a direction in which the protruding end is separated from the contact surface, and is elastically deformed repetitively to helically proceed when being screwed with a male thread to allow a relative rotation of the female threaded helical structure in one direction and prevent a relative rotation of the female threaded helical structure in another direction. ### Claim 2 (depends on 1) The female threaded body of claim 1, wherein, when observing the contact surface from a cross-sectional viewpoint in a direction perpendicular to the axis, a cross-sectional shape of the contact surface is observed at a plurality of positions in a circumferential direction of the axis and/or the cross-sectional shape is observed as being formed in an annular shape. ### Claim 3 (depends on 1) The female threaded body of claim 1, wherein the receiving portion includes a first circumferential engaging portion, and the reverse rotation-preventing member includes a second circumferential engaging portion that is engaged with the first circumferential engaging portion in a circumferential direction, wherein, by the first circumferential engaging portion and the second circumferential engaging portion, the cylindrical member and the reverse rotation-preventing member are fixed in the circumferential direction. ### Claim 4 (depends on 1) The female threaded body of claim 1, wherein the receiving portion includes a first axial engaging portion, and the reverse rotation-preventing member includes a second axial engaging portion that is engaged with the first axial engaging portion in an axial direction, wherein, by the first axial engaging portion and the second axial engaging portion, the cylindrical member and the reverse rotation-preventing member are fixed in the axial direction. ### Claim 5 (depends on 4) The female threaded body of claim 4, wherein the first axial engaging portion is engaged with the reverse rotation-preventing member in the axial direction by being bent when being assembled. ### Claim 6 (depends on 4) The female threaded body of claim 4, wherein the first axial engaging portion is formed along an outer circumference of the reverse rotation-preventing member. ### Claim 7 (depends on 1) The female threaded body of claim 1, wherein the reverse rotation-preventing member includes the engaging edge in a range of less than 360° in a circumferential direction, which is provided as a plurality of engaging edges in the circumferential direction. ### Claim 8 (depends on 1) The female threaded body of claim 1, wherein the reverse rotation-preventing member comprises: a seating surface portion being in contact with the contact surface of the receiving portion; and a standing portion extended from the seating surface portion in an axial direction, an extension distance in the axial direction gradually increasing in a circumferential direction, wherein the protruding portion is extended in a radially inward direction from the standing portion. ### Claim 9 A female threaded body comprising: a first female threaded helical structure formed on an inner circumferential surface of a hole of a cylindrical member, and set at a lead angle and/or in a lead direction; a reverse rotation-preventing member disposed in the cylindrical member, including a protruding portion extended in a radially inward direction towards an axis of the hole, and configured to prevent a rotation by the first female threaded helical structure at a predetermined circumferential angle by a protruding end of the protruding portion; and a deformable tapered surface formed on an end surface on another side of the cylindrical member, wherein, when being in contact with a male thread and elastically deformed, the protruding potion allows a relative rotation of the first female helical structure and the male thread in one direction and prevents a relative rotation of the first female threaded helical structure and the male thread in another direction to control a reverse rotation. ### Claim 10 (depends on 9) The female threaded body of claim 9, wherein, when a lead of the first female threaded helical structure is referred to as L1 and the predetermined circumferential angle is referred to as θ, an axial displacement T by a deformation of the tapered surface satisfies T≧L1×(θ/360). ### Claim 11 (depends on 9) The female threaded body of claim 9, wherein the reverse rotation-preventing member includes a disconnected or connected second female threaded helical structure at the protruding end of the protruding portion, the second female threaded helical structure set in a lead direction different from the lead direction of the first female threaded helical structure, wherein, when a lead of the first female threaded helical structure is referred to as L1 and a lead of the second female threaded helical structure is referred to as L2, an axial displacement T by a deformation of the tapered surface satisfies T≧(1/2)×{L1×L2/(L1+L2)}. ### Claim 12 (depends on 11) The female threaded body of claim 11, wherein the axial displacement T on the tapered surface satisfies T≧{L1×L2/(L1+L2)}. ### Claim 13 (depends on 9) The female threaded body of claim 9, wherein the reverse rotation-preventing member includes a disconnected or connected second female threaded helical structure at the protruding end of the protruding portion, the second female threaded helical structure set in a lead direction different from the lead direction of the first female threaded helical structure, wherein, when a lead of the first female threaded helical structure is referred to as L1 and a lead of the second female threaded helical structure is referred to as L2, an axial displacement T by a deformation of the tapered surface satisfies T≧(1/2)×{L1×L2/(L1−L2)}. ### Claim 14 (depends on 13) The female threaded body of claim 13, wherein the axial displacement T by the deformation of the tapered surface satisfies T≧{L1×L2/(L1−L2)}. ### Claim 15 (depends on 9) The female threaded body of claim 9, wherein the reverse rotation-preventing member includes a disconnected or connected second female threaded helical structure at the protruding end of the protruding portion, the second female threaded helical structure set in a lead direction different from the lead direction of the first female threaded helical structure, wherein, when a lead of the first female threaded helical structure is referred to as L1 and a pitch of the second female threaded helical structure is referred to as P2, an axial displacement T by a deformation of the tapered surface satisfies T≧(1/2)×{L1×P2/(L1+P2)}. ### Claim 16 (depends on 9) The female threaded body of claim 9, wherein the reverse rotation-preventing member includes a disconnected or connected second female threaded helical structure at the protruding end of the protruding portion, the second female threaded helical structure set in a lead direction different from the lead direction of the first female threaded helical structure, wherein, when a lead of the first female threaded helical structure is referred to as L1 and a pitch of the second female threaded helical structure is referred to as P2, an axial displacement T by a deformation of the tapered surface satisfies T≧(1/2)×{L1×P2/(L1−P2)}. ### Claim 17 A threaded body fastening structure comprising: a male threaded body; and a female threaded body to be screwed with the male threaded body, wherein the male threaded body comprises: a head portion; and an axis portion including a first male threaded helical structure set at a lead angle and/or in a lead direction, and the female threaded body comprises: a first female threaded helical structure formed on an inner circumferential surface of a hole of a cylindrical member and set at a lead angle and/or in a lead direction to be screwed with the first male threaded helical structure; and a reverse rotation-preventing member disposed in the cylindrical member, including a protruding portion extended in a radially inward direction towards an axis, and configured to prevent a rotation by the first female threaded helical structure at a predetermined circumferential angle by a protruding end of the protruding portion, wherein a deformable tapered surface is formed on an end surface of the head portion of the male threaded body and/or an end surface of the cylindrical member of the female threaded body, and an engaging edge of the female threaded body comes into contact with the male threaded body and is elastically displaced to allow a relative rotation of the first male threaded helical structure and the first female threaded helical structure in one direction and prevent a relative rotation of the first male threaded helical structure and the first female threaded helical structure in another direction to control a reverse rotation. ### Claim 18 (canceled) ### Claim 19 (depends on 17) The threaded body fastening structure of claim 17, wherein the axis portion of the male threaded body includes a second male threaded helical structure set at a lead angle and/or in a lead direction different from the lead angle and/or the lead direction of the first male threaded helical structure, and the reverse rotation-preventing member of the female threaded body includes the engaging edge of a second female threaded helical structure at the protruding end of the protruding portion to be screwed with the second male threaded helical structure connectedly or disconnectedly. ### Claim 20 (depends on 9) The female threaded body of claim 9, wherein a lead direction of the engaging edge of a helical shape of the reverse rotation-preventing member is different from the lead direction of the female threaded helical structure. ### Claim 21 (depends on 9) The female threaded body of claim 9, wherein the reverse rotation-preventing member is provided in a contact surface formed on an end surface of the cylindrical member in an axial direction of the hole, and the protruding end of the protruding portion is elastically deformed to rotate on a base end of the protruding portion as a supporting point in a direction in which the protruding end is separated from the contact surface.