Truncated Thread Patents (Class 411/423)
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Patent number: 11937992Abstract: A temporary alignment system and method for holding a dental coping to an implant abutment using the same threads in the abutment that are used for definitive attachment are disclosed. The disclosed temporary fasteners initially orient and hold a coping against an abutment with a force along the same axis as the semi-definitive screw. The aligned coping can be picked-up in a closed-tray impression process without unscrewing the temporary fastener. Embodiments include threaded posts that release copings from the abutment through axial forces. Some embodiments include a threaded post with separable cap that is picked-up with the coping. Methods for converting an existing prosthesis for screw attachment to implants in a single visit and digital capture of the converted prosthesis are described.Type: GrantFiled: June 3, 2023Date of Patent: March 26, 2024Assignee: Smart Denture Conversions, LLCInventors: Brandon Dale Kofford, Charles Albert Rudisill
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Patent number: 11261900Abstract: A bolt and a method for manufacturing the bolt are provided. The bolt includes a screw cap and a bolt bar, the bolt bar includes a positioning bar, a flexible bar and a threaded portion, the positioning bar is connected to one end of the screw cap, and the flexible bar is connected to the positioning bar and the threaded portion respectively. Wherein, an anti-shearing stand is formed on the flexible bar. The threaded portion includes standard threads and transition threads, the transition threads are formed between the flexible bar and the standard threads, and a thread height of the transition threads is smaller than a thread height of the standard threads, wherein the thread height of the standard threads keeps constant. The force distribution of the threads can be optimized, and the threads can effectively cooperate with the threads of the nut.Type: GrantFiled: May 27, 2017Date of Patent: March 1, 2022Assignee: BEIJING GOLDWIND SCIENCE & CREATION WINDPOWER EQUIPMENT CO., LTD.Inventors: Guolong Zheng, Yongjun Guo, Junhao Ge, Yiping Shi
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Patent number: 10927877Abstract: A male anti-cross threading fastener comprising: a substantially round shank having a lead end, a torque end, and a plurality of male threads around a circumference of the shank, the plurality of male threads comprising: a standard thread around at least a portion of the circumference of the shank and having a standard thread contour, wherein a width and a thread angle of the standard thread enables engagement with corresponding female threads, wherein the major diameter of the standard thread is between a lower major diameter limit and a higher major diameter limit; a transitional thread around at least a portion of the circumference of the shank and having a transitional thread contour with a width and a thread angle similar to the width and thread angle of the standard thread that enables engagement with corresponding female threads; an anti-cross thread around at least a portion of the circumference of the shank and having an anti-cross thread contour and an outside diameter configured to promote alignmenType: GrantFiled: January 11, 2019Date of Patent: February 23, 2021Assignee: MATHREAD, INC.Inventor: Michael Garver
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Patent number: 10767683Abstract: A thread profile for rotary shouldered threaded connections uses different thread root radii for the pin thread and the box thread in order to optimize stress distribution and maximize thread contact area. The thread profile may be adapted for use in double-shouldered, two-start, taper-threaded connections to replace currently-used threaded connections such as the rotor-to-adapter connection in a downhole motor. The thread profile may incorporate an undercut buttress design.Type: GrantFiled: February 26, 2016Date of Patent: September 8, 2020Assignee: Dreco Energy Services ULCInventors: Masoud Kalantari, Nicholas Ryan Marchand
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Patent number: 10544891Abstract: A system and method of assembling flanged duct sections, using large sheet metal screws through opposing inserted corner plates. The large screws are threadedly inserted fully through the corner plates of a first duct section and hold perpendicular thereto for guiding alignment with the mating duct section. The screws hold the duct sections apart to allow aligning them without fluid sealant or tape gasket material on one of the duct sections contacting the other. The screws are then threadedly engaged with the corner plates of the mating duct section, bringing the duct sections together with a leak resistant seal therebetween. Optional hanger brackets can be placed between the corner plates before assembly, and additional screws used to deform the flanges and corner plates about the brackets to compress the sealant or gasket thereabout.Type: GrantFiled: January 23, 2014Date of Patent: January 28, 2020Assignee: H J FISCHER LLCInventor: Herbert J. Fischer
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Patent number: 9798102Abstract: A barrel comprises a cylinder wall, two parting lines, and an external thread. The external thread is intersected by the two parting lines respectively, and the external thread includes a plurality of threads. The plurality of threads are connected spirally and each of the threads includes a pair of normal thread portion and a pair of shrinking thread portion. Each of the normal thread portions includes a normal thread crest and a normal thread root. The plurality of shrinking thread portions are intersected by the parting lines respectively, and each of the shrinking thread portions includes a middle location intersected by one of the parting lines, a shrinking thread crest, and a shrinking thread root. The outer diameter of each of the shrinking thread crests reaches a minimum at the middle location, and the minimal width of the shrinking thread crest is smaller than the normal crest outer diameter. The width of each of the shrinking thread crests is larger than the normal crest width.Type: GrantFiled: October 8, 2015Date of Patent: October 24, 2017Assignee: GENIUS ELECTRONIC OPTICAL (XIAMEN) CO., LTD.Inventors: Andy Huo, Xiaohua Chen, Weian Luo
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Patent number: 9788477Abstract: An agricultural implement including a tool bar and a row unit coupled to the tool bar. The row unit includes a frame member and at least one clamping device coupled to the frame member. Each clamping device has a first member having first interior features and a second member having second interior features, with the first interior features being substantially a mirror image of the second interior features.Type: GrantFiled: June 30, 2015Date of Patent: October 17, 2017Assignee: CNH Industrial America LLCInventors: Travis L. Harnetiaux, Johnathon R. Dienst
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Patent number: 9719546Abstract: A wire thread insert comprises besides a cylindrical helix consisting of a plurality of coils a moving tang projecting into the interior of the helix for installing the wire thread insert into a receiving thread. The wire thread insert is connected to the cylindrical helix via a bending portion such that the moving tang can be redressed into the receiving thread after installation of the wire thread insert. The wire thread insert is installed by means of an installation tool with a mounting spindle, which installs the wire thread insert in the receiving thread via a moving shoulder and the moving tang. A compression blade provided at the mounting spindle bends the moving tang back into the receiving thread while the mounting spindle is removed from the installed wire thread insert.Type: GrantFiled: October 28, 2011Date of Patent: August 1, 2017Assignee: BÖLLHOFF VERBINDUNGSTECHNIK GMBHInventors: Holger Thommes, Andreas Marxkors
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Patent number: 9387092Abstract: An intervertebral implant for being implanted between adjacent vertebrae is provided. The implant includes a generally elongate implant body having a length extending between opposite longitudinal ends thereof, a superior face and an inferior face. The superior face and inferior face include cortical teeth adjacent to the implant body longitudinal ends. Additionally, the superior and inferior faces include longitudinally central teeth intermediate the cortical teeth and have bone engaging ends. The central teeth have a sharper configuration than that of the cortical teeth bone engaging ends for biting into the softer central bone material of the vertebrae. The cortical teeth are arranged in a first density per unit area and the central teeth are arranged in a second density per unit area that is less than the first density.Type: GrantFiled: June 9, 2015Date of Patent: July 12, 2016Assignee: PIONEER SURGICAL TECHNOLOGY, INC.Inventors: Daniel Ryan Mermuys, Scott J. Perrow, Steven A. Schopler
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Patent number: 9107711Abstract: A bone fastener for use in orthopedic surgery for fixing an implant to bone has a threaded or unthreaded shaft configured to engage bone and a head having a thread on an outer surface to engage the implant. The thread on the head of the fastener has a profile in cross section that includes arcuate peaks with a flat on the outer surface of the peak.Type: GrantFiled: February 20, 2013Date of Patent: August 18, 2015Assignee: Stryker Trauma SAInventor: Nicolas Hainard
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Patent number: 9080590Abstract: A threaded fastener and threaded fastener system. The threaded fastener includes a body having at least one outer surface and at least one thread forming a spiral about the outer surface of the body. The thread forms a plurality of crests and a plurality of roots and the tangential distance between adjacent crests is substantially constant. The threaded fastener system includes the threaded fastener and a workpiece with an opening having at least one inner surface dimensioned to mate with outer surface of the threaded fastener.Type: GrantFiled: April 16, 2008Date of Patent: July 14, 2015Inventor: Dale E. Van Cor
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Patent number: 9031533Abstract: In a mobile terminal having a security function, both convenience and security protection are realized so as to prevent a user from feeling bothersome. A mobile phone has an operation control unit which sets the operation of various functions of the mobile terminal to be unusable at any timing. When a used state determination unit determines that the mobile phone is not in an abnormal state and not left, the operation control unit controls operation of the various functions to maintain usable states.Type: GrantFiled: June 2, 2008Date of Patent: May 12, 2015Assignee: NEC CorporationInventors: Akira Yajima, Naotake Fujita
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Patent number: 9016996Abstract: A threaded metal sleeve includes a core and a thread provided on the outside of the core, with the thread profile having a flank angle within the range from 25° to 35°. The pitch (h) of the thread is 0.1-fold to 0.4-fold of the outer diameter of the threaded sleeve, and the thread depth of the thread is 0.02-fold to 0.2-fold of the outer diameter of the threaded sleeve.Type: GrantFiled: March 8, 2012Date of Patent: April 28, 2015Assignee: RAMPA Verbindungstechnik GmbH & Co. KGInventor: Wolfgang Faerber
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Patent number: 8696284Abstract: A threaded rod comprises a single coarse thread having flattenings on opposite sides forming thread sections on opposite sides. At least one of the thread sections on one side of the threaded rod is omitted.Type: GrantFiled: April 21, 2011Date of Patent: April 15, 2014Assignee: Stahlwerk Annahutte Max Aicher GmbH & Co. KGInventor: Maximilian Aicher
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Patent number: 8554303Abstract: A radio-frequency (RF) coil for obtaining magnetic resonance data for imaging the cervical region of a patient has a loop coil contained in a housing of an applicator assembly that is adapted for placement against the cervix of the patient, and a loopless antenna contained in a tandem applicator of the assembly, that is adapted for intracorporeal placement in the cervix of the patient.Type: GrantFiled: April 14, 2011Date of Patent: October 8, 2013Inventors: Ergin Atalar, Nikolay V. Visksenko
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Publication number: 20110188966Abstract: A fastening screw bolt includes a head connected to a screw rod. The screw rod includes a helical thread having a plurality of helical turns each of which turns one revolution around the screw rod. Each helical turn has a helical cutting edge formed with at least two angularly spaced apart notches. With the notches, the screw bolt can achieve an improved engagement with a hole into which the screw bolt is inserted.Type: ApplicationFiled: July 15, 2010Publication date: August 4, 2011Inventor: Ching-Cheng TSAI
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Patent number: 7565078Abstract: A thread structure for an optical lens comprises a plastic lens barrel, and the thread structure is formed on an outer surface of the lens barrel. In each single circle of the thread structure there is a normal thread and a partial withdraw thread. The partial withdraw thread is located on a longitudinal parting line of the thread structure, a top diameter and a pitch circle diameter of the partial withdraw thread are smaller than those of the normal thread, the thread structure is provided with ribs that are located at the root of a first normal thread close to the front end of the lens barrel. The withdraw thread produces an interval between the thread structure and the base, thus preventing the burrs on the parting surface from contacting the inner threads of the base and causing powder.Type: GrantFiled: September 20, 2006Date of Patent: July 21, 2009Assignee: Largan Precision Co., Ltd.Inventors: Andy Liu, Michael Tsai
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Patent number: 7252150Abstract: A downhole tool including a selectively releasable joint, a downhole drilling assembly including the downhole tool, and a corresponding method. In one embodiment of the invention, a downhole drilling assembly includes a downhole tool having a first body and a second body mounted for relative rotation; a joint part for use in forming a selectively releasable joint between the second body and a part of the assembly coupled to the second body; and one or more locking member(s) for locking the first and second bodies relative to one another against relative rotation so as to allow a release force to be applied through the first body to release the releasable joint and allow the tool to be separated from the part of the assembly.Type: GrantFiled: March 10, 2004Date of Patent: August 7, 2007Assignee: Smith International, Inc.Inventors: Andrew McPherson Downie, Edward Docherty Scott, Roy Powell
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Patent number: 6863483Abstract: Screw provided with self-locking rolled thread, wherein, in a plurality of places along its extent, the thread is deformed in relation to the normal thread cross section in that the thread outside diameter is reduced by radial compression of limited thread portions, the area of the thread cross section being substantially identical to that of the undeformed thread. While maintaining the slant of the thread flanks, the thread cross section is symmetrically widened in the outer region and reduced in the adjoining inner region, the transition from the widened to the reduced thread cross section lying approximately in the centre of the respective thread flank, and the limited thread portion extends over two parts of a thread turn such that there result two symmetrically opposite thread portions each of approximately ? of the thread turn.Type: GrantFiled: August 19, 2003Date of Patent: March 8, 2005Assignee: EJOT GmbH & Co. KBInventors: Gottfried Koenig, Werner Menz
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Patent number: 6796761Abstract: 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.Type: GrantFiled: September 24, 2002Date of Patent: September 28, 2004Assignee: Aoyama Seisakusho Co., Ltd.Inventors: Hiromichi Mizuno, Masahiko Hamada, Tetsuya Osawa, Kazuhiro Aoyama, Mitsuru Kozawa
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Publication number: 20040037668Abstract: Screw provided with self-locking rolled thread, wherein, in a plurality of places along its extent, said thread is deformed in relation to the normal thread cross section in that the thread outside diameter is reduced by radial compression of limited thread portions, the area of the thread cross section being substantially identical to that of the undeformed thread. While maintaining the slant of the thread flanks, the thread cross section is symmetrically widened in the outer region and reduced in the adjoining inner region, the transition from the widened to the reduced thread cross section lying approximately in the centre of the respective thread flank, and the limited thread portion extends over two parts of a thread turn such that there result two symmetrically opposite thread portions each of approximately ⅙ of the thread turn.Type: ApplicationFiled: August 19, 2003Publication date: February 26, 2004Applicant: EJOT GmbH & Co. KGInventors: Gottfried Koenig, Werner Menz
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Patent number: 6685411Abstract: The object of the present invention is to dissolve effectively the problems of the encroaching, the seizure, and the racing. To attain said object, a bolt having a threaded shank portion wherein a notch slanting toward the end of said threaded shank portion at an angle in the range between 15° to 80° for the axis of said threaded shank portion is formed at the beginning of the complete thread part to expand the width of the entrance of the thread part of said thread shank portion is provided in the invention.Type: GrantFiled: August 16, 2001Date of Patent: February 3, 2004Assignee: Meidoh Co., Ltd.Inventor: Takashi Kato
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Patent number: 6565302Abstract: A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section (8) extending parallel to a central axis of the screw and a second, inclination region section (7) inclined toward the root region (5) in a direction opposite a setting direction (S) at an angle of from about 10° to about 45°.Type: GrantFiled: December 21, 2001Date of Patent: May 20, 2003Assignee: Hilti AktiengesellschaftInventors: Michael Werner, Herbert Kaufmann, Romed Staggl, Johannes Dobler
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Patent number: 6454506Abstract: An anchor bolt having a substantially cylindrical stem (2), and at least one thread provided on the stem (2) and extending from a free front end of the stem at least over a portion of a longitudinal extent of the stem (2), the thread (6) having a plurality of thread turns (6) having, at least over one/third of the stem (2), a width (b1, b2) which decreases, with an increase of a distance of a respective thread turn (6) from the free front end of the stem (2), so that a distance (x1, x2, x3) between trailing and leading flanks (8, 7) of two following one another thread turns (6) of the thread increases backwards.Type: GrantFiled: August 9, 2000Date of Patent: September 24, 2002Assignee: Hilti AktiengesellschaftInventors: Kai-Uwe Keller, Marcel John, Jürgen Wieser
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Publication number: 20020081171Abstract: A thread forming screws including opposite flanks connecting the screw crest region with the screw root region and tapering outwardly toward the root region, with each flank being formed of outer and inner flank sections tapering toward the root sections at different angles, and with the crest region being formed of a first region section (8) extending parallel to a central axis of the screw and a second, inclination region section (7) inclined toward the root region (5) in a direction opposite a setting direction (S) at an angle of from about 10° to about 45°.Type: ApplicationFiled: December 21, 2001Publication date: June 27, 2002Inventors: Michael Werner, Herbert Kaufmann, Romed Staggl, Johannes Dobler
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Patent number: 6322307Abstract: A threaded fastener (1) is disclosed for anchoring into a substrate comprising a core portion (2) having at least one helical continuous thread provided along a substantial portion of the length of the core, in which the helical thread has a substantially V-shaped cross section defining two flanks (4a, 4b) which subtend an angle of between substantially 60° and 90°, and the thread has a helix angle of between approximately 20° and 45°. The crest of the thread may be flattened, and the fastener (1) is especially suited to anchoring to a masonry substrate.Type: GrantFiled: April 3, 2000Date of Patent: November 27, 2001Assignee: Unifix LimitedInventor: Frank Glover
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Patent number: 6296432Abstract: A bolt is provided in the present invention. When said bolt is screwed in a nut, said bolt is guided by engaging the spiral guide groove of said guide boss with the thread of the nut to prevent the encroaching, the seizure, or the racing between the bolt and the nut.Type: GrantFiled: June 2, 2000Date of Patent: October 2, 2001Assignee: Meidoh Co., Ltd.Inventor: Takashi Kato
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Patent number: 6290445Abstract: Apparatus and method for forming a pin and nut fastener assembly for temporarily or permanently securing two panels having conventional drilled generally aligned holes into which the assembly is inserted. Weight of the pin and nut is reduced while retaining predetermined industry established strength requirements. The thread section of the pin is reduced along with the mating thread of the nut. The pin may be cold-worked in critical areas.Type: GrantFiled: April 18, 2000Date of Patent: September 18, 2001Assignee: Avibank Mfg., Inc.Inventors: John A. Duran, Edward Avetisian, Todd Diamond
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Patent number: 6162001Abstract: A self-aligning, anti-cross threading fastener having first and/or second members with lead threads having a curved surface feature from the minor diameter to the major diameter which allows the surface of the lead threads to cam over the mating threads of the other member and thereby aligning collinearly the longitudinal axis of the two members. The initial presentation angle of the two threaded members may be restricted and therefore enhanced by providing a protruding diameter feature.Type: GrantFiled: October 27, 1999Date of Patent: December 19, 2000Inventors: Jerry J. Goodwin, Michael A. Garver, Anthony L. Snoddy
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Patent number: 6155761Abstract: The present invention provides a novel fastener member, stud, or other threaded member, for engagement with a female member, and the method of assembly thereof. The fastener member has a novel point which facilitates engagement of the fastener member in the threaded bore, greatly reduces the possibility of cross-threading and is especially suited for use in applications involving blind holes or the use of very thin threaded holes. The fastener member has a threaded shank portion. A point is provided at the end of the shank portion and includes an unthreaded radiused portion and a threaded transition portion between the shank portion and the radiused portion. The major diameters of the threads of the transition portion gradually lessen between the opposite ends thereof. The minor diameters of the threads of the transition portion gradually lessen between the opposite ends thereof. The radiused portion can be provided with a truncated end surface.Type: GrantFiled: November 24, 1998Date of Patent: December 5, 2000Assignee: Textron Inc.Inventor: Steven P. Donovan
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Patent number: 5997231Abstract: A self-aligning, anti-cross threading fastener having first and/or second members with lead threads having a curved surface feature from the minor diameter to the major diameter which allows the surface of the lead threads to cam over the mating threads of the other member and thereby aligning collinearly the longitudinal axis of the two members. The initial presentation angle of the two threaded members may be restricted and therefore enhanced by providing a protruding diameter feature.Type: GrantFiled: November 16, 1998Date of Patent: December 7, 1999Inventors: Jerry J. Goodwin, Michael A. Garver, Anthony L. Snoddy
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Patent number: 5964768Abstract: A bone screw having a continuously varying pitch includes a tapered root portion having a relatively small diameter on a leading end of the screw and a larger trailing diameter. The pitch of the screw decreases between the leading and trailing ends thus causing the bone fragments in a fracture to be drawn together when the screw is installed across the fragments. The radially outer diameter of the threads increases between the leading and trailing ends thus causing each successive thread portion to cut into bone radially outwardly from the preceding thread portion thereby providing uncut bone in which the succeeding threads can gain purchase.Type: GrantFiled: March 3, 1998Date of Patent: October 12, 1999Assignee: Acumed, Inc.Inventor: Randall J. Huebner
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Patent number: 5865584Abstract: A fastener and method for securing plywood to sheet metal comprises a head, and a shank with three distinct segments. The first segment is a threaded tip segment with a pierce point tip; the second segment is unthreaded; the third segment is threaded and extends from the unthreaded second segment to the fastener head. The method provides for use of a power tool to secure together a plywood sheet with a sheet metal stud using the fastener.Type: GrantFiled: May 8, 1997Date of Patent: February 2, 1999Inventor: Daniel Onofrio
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Patent number: 5836731Abstract: A self-aligning, anti-cross threading fastener having first and/or second members with lead threads having a curved surface feature from the minor diameter to the major diameter which allows the surface of the lead threads to cam over the mating threads of the other member and thereby aligning collinearly the longitudinal axis of the two members. The initial presentation angle of the two threaded members may be restricted and therefore enhanced by providing a protruding diameter feature.Type: GrantFiled: January 12, 1998Date of Patent: November 17, 1998Assignee: MAThread, Inc.Inventors: Jerry J. Goodwin, Michael A. Garver, Anthony L. Snoddy
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Patent number: 5730566Abstract: A self-aligning, anti-cross threading fastener having a first member with lead threads having a curved surface feature from the minor diameter to the major diameter which allows the surface of the lead threads to cam over the mating threads of a second member and thereby aligning collinearly the longitudinal axis of the two members. The initial presentation angle of the two threaded members may be restricted and therefore enhanced by providing a protruding diameter feature.Type: GrantFiled: May 20, 1997Date of Patent: March 24, 1998Inventors: Jerry J. Goodwin, Michael A. Garver, Anthony L. Snoddy
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Patent number: 5722808Abstract: A fastener system capable of clamping a workpiece that provides for enhanced distribution of the internal forces that are generated in the components as a result of the assembly of the system. The fastener system includes an externally threaded member having a thread formed thereon with a substantially non-triangular profile, and an internally threaded member having a thread formed therein which also includes a substantially non-triangular profile. In assembled form, the substantially non-triangular thread faces of the internally and externally threaded members mate along a contact face and, by virtue of their unique thread forms, are able to withstand axial loads of greater magnitude than comparable systems employing threads having substantially triangular profiles.Type: GrantFiled: September 11, 1996Date of Patent: March 3, 1998Assignee: Conti Fasteners AGInventor: Alan Pritchard
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Patent number: 5580199Abstract: A fastening screw is provided with a locking function to prevent loosening thereof after being tightened.Type: GrantFiled: April 17, 1995Date of Patent: December 3, 1996Assignee: Kabushiki Kaisha Suzuki Rashi SeisakushoInventor: Yasuo Suzuki
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Patent number: 5340254Abstract: A thread forming screw for cold forming, using primarily compressive forces, internal threads in a workpiece comprised of a low ductility material, such as magnesium and the like, comprises a shank having an entering end and a head end. External threads are disposed on the shank between the entering end and the head end. The external threads define an angular configuration with the angular configuration defining an angle measuring substantially within the range of ninety degrees to one hundred and twenty degrees.Type: GrantFiled: December 8, 1992Date of Patent: August 23, 1994Assignee: Textron Inc.Inventors: Paul E. Hertel, James R. Schneider
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Patent number: 5060740Abstract: A thread coupling comprises two interconnected screw threads. Each of the screw threads has a root portion shaped as a portion of an ellipse. With respect to one of the threads having such a shape, the major axis of the ellipse is longer than that of the other thread.Type: GrantFiled: May 29, 1990Date of Patent: October 29, 1991Assignee: Sandvik Rock Tools, Inc.Inventors: Faisal J. Yousef, Robert F. Kane, Joel Ham, David Mildren
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Patent number: 5052871Abstract: A modified "Acme" type of male and female thread combination has a single-start male thread (10) of machined steel and a single-start female thread (12) of cast nodular graphite iron. The crown (20) of the female thread (12) is machined but the flanks (22, 22) and root (24) are left un-machined. There is plenty of clearance left between the crown (14) of the male thread (10) and the root (24) of the female thread (12). This reduces cost and yet the screw threads are adequate for use in a trench-box strut. The feed per revolution is 20 mm.Type: GrantFiled: June 14, 1990Date of Patent: October 1, 1991Assignee: Mabey Hire Company LimitedInventor: John Collins
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Patent number: 4958973Abstract: An internal-pressure-bearing female screw adapted to be applied with a varying composite load due to variation of an internal pressure, in which the thread contact heights of the female screw are formed so as to be successively lowered along the direction of an applied tensile load, whereby the bending moments per unit length at the bottom of valleys of the respective female screw threads are equalized to reduce the maximum bending moment and the bending moment amplitude.Type: GrantFiled: June 9, 1988Date of Patent: September 25, 1990Inventor: Nobuyuki Sugimura
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Patent number: 4861210Abstract: The present invention relates to an improved threaded element forming for example a screw, which comprises a thread (F) whose bottom (3) comprises two arcs of a circle (4) with equal radii (r.sub.1) which are connected tangentially with the sides (2) of thread (F) and one central arc of a circle (5) with a larger radius (r.sub.2), and which is connected tangentially with the two arcs of a circle (4).Type: GrantFiled: December 16, 1988Date of Patent: August 29, 1989Assignee: Simmonds S.A.Inventor: Jean-Claude Frerejacques
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Patent number: 4815360Abstract: A rod-piston connection uses a split ring, having two or more segments, provided with a plurality of shallow internal grooves which are adapted to mate with a corresponding plurality of shallow grooves on the piston rod, the outer periphery of the split ring having a tapered surface extending over the entire width of th split ring and adapted to mate with a corresponding wide tapered surface defined in a bore of a compression bushing which has a peripheral surface provided with threads which engage with an internal threaded surface in a cavity in the pistion. By applying a threading torque to the compression sleeve, a force is generated by the two tapered surfaces to force the compression sleeve into better contact with the pistion and to force the split ring into a better contact with the piston rod.Type: GrantFiled: July 13, 1987Date of Patent: March 28, 1989Inventor: Albert Winterle
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Patent number: 4799844Abstract: A screw structure (10) is provided for male and female threads (14) having at least one thread (14) extending helically along a cylindrical support member (12) in spaced thread turns. A root portion (22) extends between adjacent thread (14) turns and has a curvature defined by a portion of an ellipse (24) for providing improved stress reduction during periods of severe loading.Type: GrantFiled: January 11, 1988Date of Patent: January 24, 1989Assignee: TRW IncInventor: Jo-Yu Chuang
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Patent number: 4610064Abstract: A device for spreading two flanges (1, 2) mounted in opposite position in a pipe system (3), which device mainly comprises a conical screw element (7) to be inserted into a continuous hole of a flange, said element having an axial opening, in which fits a pressure member (6) having a pressure head face for the axial displacement of the pressure member in said opening, wherein the screw element (7) has a screwthread with at least three leads in order to adapt said device for a greater variety of hole diameters in the flanges (1, 2) and to guarantee the necessary guiding of the conical screw element (7) during insertion thereof.Type: GrantFiled: March 20, 1985Date of Patent: September 9, 1986Assignee: 501 Peinemann Equipment B.V.Inventor: Paul F. M. Verstraeten
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Patent number: 4600224Abstract: A thread form for a tubular connection of the type having a pin member adapted to be made up with a box member to form a pipe joint is shown. The pin member has pin threads with thread crests and thread roots which are adapted to be made up with a mating box member having a complimentary thread structure. The pin thread crests are formed between a stab flank and a load flank of the pin thread. The pin thread has a chevron-shaped load flank for engaging a mating chevron-shaped load flank of the complimentary box member to provide a chevron type interfit between the load bearing load flanks of the pin and box threads. The pin and box threads are also helically structured as a wedge. The chevron type interfit serves to limit the radial movement of the pin threads into the mating box member complimentary thread structure to control the radial make up of the pipe joint.Type: GrantFiled: December 23, 1983Date of Patent: July 15, 1986Assignee: Interlock Technologies CorporationInventor: Thomas L. Blose
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Patent number: 4600225Abstract: A thread form is shown for a tubular connection of the type having a pin member adapted to be made up with a box member to form a pipe joint. The pin member has pin threads with thread crests and thread roots which are adapted to be made up with a mating box member having a complimentary thread structure. The pin thread crests are formed between a stab flank and a load flank of the pin thread. A pin thread has a chevron-shaped load flank for engaging a mating chevron-shaped load flank of the complimentary box member to provide a chevron type interfit between the load bearing flanks. The load flanks of the pin member includes an outer wall portion with a positive slope which provides additional clearance between the complimentary threads on the pin and box members during disassembly to prevent inadvertent hanging-up of the threads.Type: GrantFiled: December 23, 1983Date of Patent: July 15, 1986Assignee: Interlock Technologies CorporationInventor: Thomas L. Blose
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Patent number: 4549754Abstract: A tool joint in which different tapers on the threads result in an artificial change in pitch and a radial interference and an asymmetric root cut on a larger radius than conventional API threads together with the effect of the tapered thread engagement reduces maximum stress in the thread roots and prevents over-torquing.Type: GrantFiled: June 20, 1983Date of Patent: October 29, 1985Assignee: Reed Tubular Products CompanyInventors: Donna D. Saunders, Manmohan S. Kalsi, Gun-Shing Chen
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Patent number: 4527932Abstract: For the purpose of assuring, during insertion in plastic, a highly stressable connection between screw and plastic with relatively small driving torques, a self-tapping screw is provided with a symmetrical thread profile whose thread angle (8) changes steadily from the crest (5) of the flank to the root (3) of the thread.Type: GrantFiled: March 3, 1983Date of Patent: July 9, 1985Assignee: Richard Bergner GmbH & Co.Inventors: Jurgen Onasch, Gottfried Ehrenstein
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Patent number: 4408721Abstract: A hydro-air jet assembly wherein a ball-shaped element has a first passageway therethrough communicating with an air supply and a second passage therethrough communicating with a water supply which is rotatably mounted in a housing and has a venturi nozzle secured to the ball to corotate therewith but which is adjustable in an axial direction with respect to the ball member providing constant water and air flow rates through the ball and nozzle assembly regardless of the angular position of the ball. A venturi nozzle holder is used which provides a novel means of securing the adjustable venturi nozzle to the ball member.Type: GrantFiled: February 23, 1981Date of Patent: October 11, 1983Assignee: Jacuzzi Inc.Inventors: Carlos Cohen, Alfred Raab