Patents by Inventor Mark A. Hirsch

Mark A. Hirsch 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).

  • Patent number: 8726749
    Abstract: Disclosed is an exemplary transmission clutch fork position sensor including an elongated bar and a clutch fork slidably engaging the elongated bar. A yoke bar includes a first end coupled to the clutch fork for concurrent movement therewith. A position sensor operably engages the yoke bar, and is operable for detecting a position of the yoke bar.
    Type: Grant
    Filed: September 25, 2011
    Date of Patent: May 20, 2014
    Assignee: Eaton Corporation
    Inventors: Mark A. Hirsch, Paul J. Mason, Robert B. Craft
  • Publication number: 20130075224
    Abstract: Disclosed is an exemplary transmission clutch fork position sensor including an elongated bar and a clutch fork slidably engaging the elongated bar. A yoke bar includes a first end coupled to the clutch fork for concurrent movement therewith. A position sensor operably engages the yoke bar, and is operable for detecting a position of the yoke bar.
    Type: Application
    Filed: September 25, 2011
    Publication date: March 28, 2013
    Inventors: Mark A. Hirsch, Paul J. Mason, Robert B. Craft
  • Patent number: 7861612
    Abstract: A range selection control system for a transmission facilitates safe operation of a power take off. A fluid actuated range piston assembly within a range cylinder moves between low range and high range positions. Range cylinder and range piston assembly define sealed high range and low range chambers. A neutral cylinder intersects range cylinder. A fluid actuated neutral piston assembly within neutral cylinder defines a neutral chamber. Neutral piston assembly engages range control piston assembly responsive to pressurization of neutral chamber. Neutral piston assembly is received by an engagement feature of range piston assembly when range control piston assembly is in a neutral position, retaining range piston assembly there. An electrically responsive locking mechanism locks neutral piston assembly in place when range piston assembly is in the neutral position. The locking is controlled by a condition of an electrical switch indicating a transmission condition.
    Type: Grant
    Filed: April 2, 2007
    Date of Patent: January 4, 2011
    Assignee: Eaton Corporation
    Inventors: Kuan-Jen Jeng, Mark A. Hirsch, Thomas N. Riley, C. David Bradley
  • Publication number: 20080236322
    Abstract: A range selection control system for a transmission facilitates safe operation of a power take off. A fluid actuated range piston assembly within a range cylinder moves between low range and high range positions. Range cylinder and range piston assembly define sealed high range and low range chambers. A neutral cylinder intersects range cylinder. A fluid actuated neutral piston assembly within neutral cylinder defines a neutral chamber. Neutral piston assembly engages range control piston assembly responsive to pressurization of neutral chamber. Neutral piston assembly is received by an engagement feature of range piston assembly when range control piston assembly is in a neutral position, retaining range piston assembly there. An electrically responsive locking mechanism locks neutral piston assembly in place when range piston assembly is in the neutral position. The locking is controlled by a condition of an electrical switch indicating a transmission condition.
    Type: Application
    Filed: April 2, 2007
    Publication date: October 2, 2008
    Applicant: Eaton Corporation
    Inventors: Kuan-Jen Jeng, Mark A. Hirsch, Thomas N. Riley, C. David Bradley
  • Publication number: 20040016619
    Abstract: A method for forming a transmission synchronizer friction surface includes the steps of forming a woven substrate fabric, oxidizing the substrate fabric, carbonizing the substrate fabric, densifying the carbonized substrate fabric, burnishing the densified carbonized substrate fabric, applying a thermoset adhesive to the burnished substrate fabric, and heating and pressing the piece of fabric against a conical surface of a synchronizer element. To form the fabric, yarn is formed of chopped substrate fibers, and the yarn is woven to form the woven substrate fabric. Densification is increased by extending a period of time of chemical vapor deposition to achieve a weight in an unburnished condition of at least 16 ounces per square yard for a thickness range of approximately 40 to 50 mils. Both sides of the substrate fabric are burnished. The material is pressed against the conical surface under a high pressure of at least 2000 psi to achieve the desired bonding of the substrate fabric to the conical surface.
    Type: Application
    Filed: April 30, 2003
    Publication date: January 29, 2004
    Applicant: Eaton Corporation
    Inventors: Daniel A. Monette, Mark A. Hirsch, Bohdan Lisowsky, Mark W. Marklin, Douglas B. Barton, Patrick L. Brown
  • Patent number: 6035738
    Abstract: A bias mechanism includes a plunger secured within a bore extending in a generally tangential direction through a shift fork hub and intersecting a transverse aperture for mounting the hub on a shift shaft, the plunger having a portion protruding through the bore to selectively contact either the shift shaft or a shifting key or pin during rotation of the shift shaft, and a spring to provide resistance to movement of the plunger within the bore thereby causing rotational resistance to the shift shaft while eliminating axial resistance or drag during translation of the shift shaft. In one embodiment, the plunger contacts a shifting element fixed to the shift shaft, such as a shifting key or pin. In another embodiment, the plunger contacts the shift shaft directly but only during selection of the biased shift yoke for translation to engage a particular gear.
    Type: Grant
    Filed: March 17, 1998
    Date of Patent: March 14, 2000
    Assignee: Eaton Corporation
    Inventors: Michael J. Huggins, Mark A. Hirsch
  • Patent number: 5941126
    Abstract: A shift fork assembly includes a pin sized for clearance and a retainer clip to secure a shift fork to a shift rail. The shift rail has a transverse bore extending at least partially into the shift rail. The shift fork has an axial bore receiving the shift rail therethrough, and a transverse mount hole intersecting the axial bore. The pin extends through the mount hole and at least partially into the transverse bore. The pin is sized for clearance relative to the mount hole and the transverse bore to facilitate assembly. The retainer clip is affixed to the shift fork and engages the pin to retain the pin within the transverse bore.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: August 24, 1999
    Assignee: Eaton Corporation
    Inventors: Mark A. Hirsch, Thomas G. Ore
  • Patent number: 5497867
    Abstract: A pin-type, double-acting synchronizer mechanism (18) with friction clutches (20,32 and 22,34), jaw clutches (24,14b and 26,16b) and self-energizing ramps. The ramps act between a shaft (12) and a shift flange (28) which is rotatable relative to the shaft and jaw clutch members (24,26). Flange (28) includes radially inwardly extending teeth (48) defining self-energizing ramps (48a,48b,48c,48d) which act against ramps (50a,50b,50c,50d) defined by a post-like portion (50) formed from shaft splines (12b). Three circumferentially spaced pins (36) include blocker shoulders for preventing asynchronous engagement of the jaw clutches and pre-energizer surfaces which each cooperate with a pre-energizer assembly (38). Friction members (20,22) of the friction clutches are slidably splined to gears to prevent relative rotation therebetween and abut surfaces (14d,16d) defined by gears (14,16) to limit axial movement away from mating friction rings (32,34), respectively.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: March 12, 1996
    Assignee: Eaton Corporation
    Inventors: Mark A. Hirsch, Donald M. Stout, Derek P. J. Corns, Patrick Randrianarison, George Skotnicki
  • Patent number: 5216931
    Abstract: A fluid pressure actuated auxiliary transmission section (14) shift control system (230)/method is provided which includes control members (246, 328) to prevent auxiliary section synchronized clutch (92, 128) damage if the main transmission section (12) is engaged during an auxiliary section shift. A range interlock assembly (258) is provided which will release the range slave valve (238) as the main transmission section is shifted toward the neutral position thereof.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: June 8, 1993
    Assignee: Eaton Corporation
    Inventors: Mark A. Hirsch, James R. Grundy
  • Patent number: 5193410
    Abstract: A shift valve (312) assembly for an auxiliary transmission section (14) shift control system (300)/method is provided which will prevent auxiliary section sychronized clutch (922, 128) damage, and will complete the auxiliary section shaft, if the main transmission section (12) is engaged during an auxiliary section shift into high speed ratio thereof.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: March 16, 1993
    Assignee: Eaton Corporation
    Inventors: Alan C. Stine, Terry F. Terwilliger, Joseph D. Reynolds, Michael J. Huggins, Mark A. Hirsch
  • Patent number: 5172604
    Abstract: A fluid pressure actuated auxiliary transmission section (14) shift control system (230)/method is provided which includes control members to minimize the possibility of auxiliary section synchronized clutch (92, 128) damage by the main transmission section (12) being engaged during an auxiliary section shift. A range interlock assembly (258) is provided which will release the range slave valve (238) as the main transmission section is shifted into the neutral position thereof and preexhaust valves (300, 302) are provided which will exhaust the appropriate actuator chamber (222A, 224A) upon preselection of an auxiliary section shift.
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: December 22, 1992
    Assignee: Eaton Corporation
    Inventors: Daniel A. Monette, Mark A. Hirsch, James R. Grundy, Terry E. Teeter