Patents by Inventor John Hammargren
John Hammargren has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 12000213Abstract: A drill bit for percussion drilling includes a drill bit body including a front surface. The front surface includes a first circular area arranged transverse and coaxially to the axis of the drill body, a second area surface surrounding the first area surface, and a third area surface surrounding the second area surface. A number of buttons are arranged in the second and third area surfaces. The button body of each button has a forward end surface. The buttons are arranged in circular recesses extending substantially transverse from the second surface and third area surface into the drill bit body. The recesses have a radius corresponding to the button body radius and a depth corresponding to the length of the button body, such that the button bodies are fitted within the drill bit body with the forward end surface exposed in the second and third area surfaces.Type: GrantFiled: July 3, 2020Date of Patent: June 4, 2024Assignee: Sandvik Mining and Construction Tools ABInventor: John Hammargren
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Publication number: 20240117687Abstract: A drilling assembly for percussive drilling includes at least two of a drill bit, a drill rod and a guide adapter. A peripheral surface of the shoulder on the drill rod is at least partially encased in both radial and axial directions inside the mounting sleeve of the drill bit or the mounting sleeve of the guide adapter, and/or the peripheral surface of the shoulder on the guide adapter is at least partially encased in both radial and axial directions inside the mounting sleeve of the drill bit.Type: ApplicationFiled: October 9, 2020Publication date: April 11, 2024Inventor: John HAMMARGREN
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Publication number: 20240011355Abstract: A drill bit includes a shank and drill bit head, which are both centered on a longitudinal axis, a gauge, and a front face with a peripheral edge adjacent to the gauge. An area within the peripheral edge defines a total area of the front face. The front face includes a central island at its radially innermost section, a plurality of peripheral platforms at its radially outermost section adjacent to the peripheral edge, and a recessed section positioned radially between the central island and the peripheral platforms. The central island and the peripheral platforms are axially raised compared to the recessed section. A plurality of inner front inserts are positioned on the central island and at least one outer front insert is positioned on each of the peripheral platforms. The area of the recessed section is >62% of the area of the total area of the front face.Type: ApplicationFiled: August 23, 2021Publication date: January 11, 2024Inventor: John HAMMARGREN
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Publication number: 20230272678Abstract: A female portion is arranged to form part of a thread joint for a percussive drilling tool including a mounting sleeve having an axial end, wherein the mounting sleeve surrounds an internal cavity having an axial inner wall at the opposing end of the mounting sleeve compared to the axial end. The mounting sleeve has at least one substantially cylindrical internally threaded section having a length L1, a thread entrance positioned towards the axial end and a thread exit positioned towards the axial inner wall. A thread clearance section is positioned between the axial inner wall and the thread exit and has a length L2 and a diameter D1. A guiding section is positioned between the thread entrance and the axial end of the sleeve and has a length, L3, wherein 0 mm<L3-L2<12 mm.Type: ApplicationFiled: June 29, 2021Publication date: August 31, 2023Inventor: John HAMMARGREN
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Publication number: 20220268104Abstract: A drill bit for percussion drilling includes a drill bit body including a front surface. The front surface includes a first circular area arranged transverse and coaxially to the axis of the drill body, a second area surface surrounding the first area surface, and a third area surface surrounding the second area surface. A number of buttons are arranged in the second and third area surfaces. The button body of each button has a forward end surface. The buttons are arranged in circular recesses extending substantially transverse from the second surface and third area surface into the drill bit body. The recesses have a radius corresponding to the button body radius and a depth corresponding to the length of the button body, such that the button bodies are fitted within the drill bit body with the forward end surface exposed in the second and third area surfaces.Type: ApplicationFiled: July 3, 2020Publication date: August 25, 2022Inventor: John HAMMARGREN
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Publication number: 20210238927Abstract: A percussive drill bit includes a head and an axially rearward skirt. A plurality of ribs project radially outward at the skirt and define lengthwise extending channels. The ribs and channels, in the lengthwise direction are curved or angled to deviate from a longitudinal axis of the drill bit to facilitate rearward transport of fines and flushing fluid.Type: ApplicationFiled: August 15, 2019Publication date: August 5, 2021Inventors: John HAMMARGREN, David WICKSTROM
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Publication number: 20200408048Abstract: A connection for use in percussion drilling includes a male coupling and a female coupling. Each coupling includes a body and a respective screw thread formed on a respective inner or outer surface of the respective body. Each thread has a thread-form including a crest, a root, a contact flank and a non-contact flank. Each thread-form has a contact flank angle and a non-contact flank angle inclined relative to a respective baseline located at a respective minor or major diameter thereof. Each non-contact flank angle is greater than the respective contact flank angle. The crest of each thread-form is inclined from the respective contact flank to the respective non-contact flank such that an apex of the respective thread-form defining a respective minor or major diameter thereof is located adjacent to the respective non-contact flank.Type: ApplicationFiled: February 22, 2019Publication date: December 31, 2020Inventors: John HAMMARGREN, Andreas NORMAN
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Patent number: 10626680Abstract: A percussive rock drill bit has a head and a shank in which a plurality of flushing grooves extend radially outward and axially rearward from a front face. The flushing grooves are configured to optimize the axially rearward flow of rock particles and fines entrained in the flushing fluid. In particular, each groove is generally convex relative to a longitudinal axis of the drill bit and is declined continuously relative to the axis from a first groove end to a second groove end.Type: GrantFiled: December 15, 2014Date of Patent: April 21, 2020Assignee: SANDVIK INTELLECTUAL PROPERTY ABInventors: Andreas Rindeskar, John Hammargren
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Patent number: 9797202Abstract: A drill bit for rock drilling tools includes a drill bit head having a front surface including a face surface defining a forward-most end of the drill bit head. The face surface has an outer edge, a gauge surrounding the face surface, the gauge having an inner edge, and a transition region that extends in a direction of a longitudinal axis of the drill bit between the outer edge of the face surface and the inner edge of the gauge. An entirety of the face surface from which the cutting surfaces extend is non-flat so that a center of the face surface is axially forward of the outer edge of the face surface. The gauge includes a first gauge surface defining a first angle with the longitudinal axis over a first portion of a circumference of the gauge and a second gauge surface defining a second angle with the longitudinal axis over a second portion of the circumference of the gauge.Type: GrantFiled: October 29, 2012Date of Patent: October 24, 2017Assignee: SANDVIK INTELLECTUAL PROPERTY ABInventors: Andreas Rindeskar, John Hammargren
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Publication number: 20160348442Abstract: A percussive rock drill bit has a head and a shank in which a plurality of flushing grooves extend radially outward and axially rearward from a front face. The flushing grooves are configured to optimize the axially rearward flow of rock particles and fines entrained in the flushing fluid. In particular, each groove is generally convex relative to a longitudinal axis of the drill bit and is declined continuously relative to the axis from a first groove end to a second groove end.Type: ApplicationFiled: December 15, 2014Publication date: December 1, 2016Applicant: SANDVIK INTELLECTUAL PROPERTY ABInventors: Andreas RINDESKAR, John HAMMARGREN
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Publication number: 20140299388Abstract: A drill bit for rock drilling tools includes a drill bit head having a front surface including a face surface defining a forward-most end of the drill bit head. The face surface has an outer edge, a gauge surrounding the face surface, the gauge having an inner edge, and a transition region that extends in a direction of a longitudinal axis of the drill bit between the outer edge of the face surface and the inner edge of the gauge. An entirety of the face surface from which the cutting surfaces extend is non-flat so that a center of the face surface is axially forward of the outer edge of the face surface. The gauge includes a first gauge surface defining a first angle with the longitudinal axis over a first portion of a circumference of the gauge and a second gauge surface defining a second angle with the longitudinal axis over a second portion of the circumference of the gauge.Type: ApplicationFiled: October 29, 2012Publication date: October 9, 2014Applicant: Sandvik Intellectual Property ABInventors: Andreas Rindeskar, John Hammargren
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Patent number: 5944680Abstract: A method of predicting critical points in patient respiration includes monitoring at least one characteristic of a respiratory effort waveform of a patient to detect a respiratory event. A refractory period is defined that includes a hard refractory period during which time the respiratory event cannot be responded to and a soft refractory period following the hard refractory period. The respiratory event outside of the refractory period is detected as a function of a first set of predetermined parameters for the monitored at least one characteristic and the respiratory event within the soft refractory period is detected as a function of a second set of predetermined parameters for the monitored at least one characteristic. The respiratory event may be inspiration onset and the characteristic of the respiratory effort waveform monitored is at least one of slope and amplitude.Type: GrantFiled: June 26, 1996Date of Patent: August 31, 1999Assignee: Medtronic, Inc.Inventors: Mark A. Christopherson, Johann J. Neisz, John Hammargren
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Patent number: 5697952Abstract: A cardiac assist device having muscle augmentation after a confirmed arrhythmia. In particular the present invention operates, in a first embodiment, to sense a cardiac event, next it determines whether the cardiac event is a cardiac arrhythmia, if the event is not a cardiac arrhythmia the devices delivers stimulation to a skeletal muscle grafted about a heart, but if the event is a cardiac arrhythmia the device inhibits delivery of skeletal muscle stimulation and once the arrhythmia is confirmed, then delivers therapeutic stimulation to the heart. In a second embodiment the present invention operates to re-initiate skeletal muscle stimulation once the arrhythmia is confirmed but prior to the delivery of the therapeutic stimulation to the heart.Type: GrantFiled: August 17, 1995Date of Patent: December 16, 1997Assignee: Medtronic, Inc.Inventors: David Francischelli, John Hammargren, Johann J. Neisz, David K. Peterson, Koen J. Weijand
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Patent number: 5697884Abstract: A cardiac assist device having circadian muscle stimulation. In particular the present invention operates in one of two states, either day mode or night mode. During the day mode, muscle stimulation and conditioning are performed according to a first schedule. During the night mode, muscle stimulation and conditioning are performed according to a second schedule. In addition, the night mode is only reached if the night mode is permitted, a set number of sensed beats are less than the night mode rate, and the time of day is nighttime. The night mode is interrupted if the night mode is turned off, the time of day is daytime, or a set number of beats are greater than the night rate. In short, the present invention provides for skeletal muscle stimulation at a less fatiguing level during the night than during the day.Type: GrantFiled: August 17, 1995Date of Patent: December 16, 1997Assignee: Medtronic, Inc.Inventors: David Francischelli, Kendra K. Gealow, John Hammargren, Johann J. Neisz
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Patent number: 5607385Abstract: A device and algorithm for a combined cardiomyostimulator and a cardiac pacer-cardioverter-defibrillator.Type: GrantFiled: August 17, 1995Date of Patent: March 4, 1997Assignee: Medtronic, Inc.Inventors: David Francischelli, Kendra K. Gealow, Pierre A. Grandjean, John Hammargren, Johann J. Neisz, David K. Peterson
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Patent number: D705827Type: GrantFiled: September 7, 2012Date of Patent: May 27, 2014Assignee: Sandvik Intellectual Property ABInventors: John Hammargren, Andreas Rindeskar