Patents by Inventor Mitchell H. Hetrich

Mitchell H. Hetrich 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).

  • Publication number: 20230310910
    Abstract: Systems and methods are provided for a fall limiting device. An embodiment includes a housing and a rotatable drum comprising an axle and two side portions, said rotatable drum comprising a single contiguous material piece. A retractable member is held, at least in part, within the housing via winding around the rotatable drum within the two side portions.
    Type: Application
    Filed: March 31, 2022
    Publication date: October 5, 2023
    Inventors: Mitchell H. Hetrich, Michael D. Monahan, Bryan Kroh
  • Patent number: 11633634
    Abstract: A fall arrest system includes a line retraction device having a safety line, an energy absorber configured for connecting to a terminal end of the safety line, and a harness configured for connecting to the energy absorber such that the energy absorber is disposed between the terminal end of the safety line and the harness. The safety line is selected to have a predetermined mean breaking force with a first standard deviation, and the energy absorber is selected to have a predetermined mean deployment force with a second standard deviation. The mean breaking force of the safety line and the mean deployment force of the energy absorber overlap over an overlapping region of the first and second standard deviation. A ratio of an overlap mean force of the overlapping region to an overlap standard deviation of the overlapping region is less than or equal to 6.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: April 25, 2023
    Assignee: MSA Technology, LLC
    Inventors: Jeffrey F. Harding, Mitchell H. Hetrich, Gregory M. Grupp
  • Patent number: 11191325
    Abstract: A connection arrangement for use with a wearable body harness has a first connector having a body with a first portion of a locking mechanism and a second connector having a body with a second portion of the locking mechanism. The first portion of the locking mechanism has a tab connected to the body of the first connector and a slot having a first portion extending through the body of the first connector and a second portion extending through the tab. The second portion of the locking mechanism has a tongue configured for being received through the first portion of the slot, and an intermediate connecting element having a first end connected to the body of the second connector and a second end connected to the tongue. The second end of the intermediate connecting element is offset from the body of the second connector.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: December 7, 2021
    Assignee: MSA Technology, LLC
    Inventor: Mitchell H. Hetrich
  • Patent number: 10625105
    Abstract: A connector includes a frame having a first end, a second end, and a pass-through opening extending between the first end and the second end along a longitudinal axis of the frame. The connector further has a gate positioned between the first end and the second end of the frame and movable between a closed position to close the pass-through opening and an open position to open the pass-through opening. A locking mechanism selectively locks the gate in the closed position. The locking mechanism has a rotatable knob connected to at least one of the first end and the second end of the frame and rotatable in a direction about the longitudinal axis, and a locking indent on the gate configured for receiving at least a portion of the rotatable knob when the gate is in the closed position. The rotatable knob is rotationally biased by a biasing mechanism.
    Type: Grant
    Filed: November 20, 2017
    Date of Patent: April 21, 2020
    Assignee: MSA Technology, LLC
    Inventors: Mitchell H. Hetrich, Robert Pitt
  • Publication number: 20190313746
    Abstract: A connection arrangement for use with a wearable body harness has a first connector having a body with a first portion of a locking mechanism and a second connector having a body with a second portion of the locking mechanism. The first portion of the locking mechanism has a tab connected to the body of the first connector and a slot having a first portion extending through the body of the first connector and a second portion extending through the tab. The second portion of the locking mechanism has a tongue configured for being received through the first portion of the slot, and an intermediate connecting element having a first end connected to the body of the second connector and a second end connected to the tongue. The second end of the intermediate connecting element is offset from the body of the second connector.
    Type: Application
    Filed: April 13, 2018
    Publication date: October 17, 2019
    Inventor: Mitchell H. Hetrich
  • Publication number: 20190308041
    Abstract: A fall arrest system includes a line retraction device having a safety line, an energy absorber configured for connecting to a terminal end of the safety line, and a harness configured for connecting to the energy absorber such that the energy absorber is disposed between the terminal end of the safety line and the harness. The safety line is selected to have a predetermined mean breaking force with a first standard deviation, and the energy absorber is selected to have a predetermined mean deployment force with a second standard deviation. The mean breaking force of the safety line and the mean deployment force of the energy absorber overlap over an overlapping region of the first and second standard deviation. A ratio of an overlap mean force of the overlapping region to an overlap standard deviation of the overlapping region is less than or equal to 6.
    Type: Application
    Filed: April 4, 2019
    Publication date: October 10, 2019
    Inventors: Jeffrey F. Harding, Mitchell H. Hetrich, Gregory M. Grupp
  • Patent number: 10413761
    Abstract: A line retraction device includes a rotatable drum having a line associated therewith, with the line including a first end directly or indirectly attached to the drum and a second end opposite the first end, and at least one retraction member biasing the drum in a first rotational direction of the drum opposite a second rotational direction of the drum, where the drum is configured to: (i) retract the line when the drum moves in the first rotational direction; and (ii) payout the line when the drum moves in the second rotational direction. The device further including a damper assembly configured to provide rotational resistance to the drum in: (i) the first rotational direction of the drum as the line is being retracted; and (ii) the second rotational direction as the line is being paid out.
    Type: Grant
    Filed: March 2, 2016
    Date of Patent: September 17, 2019
    Assignee: MSA Technology, LLC
    Inventor: Mitchell H. Hetrich
  • Patent number: 10328294
    Abstract: A load indicator for use with a fall protection apparatus having a line and a connector for connecting to a user includes a housing having a pass-through opening and a covered indicator region. At least a portion of the housing is configured for connecting to the line. The load indicator also includes a shear pin supported by the housing and extending across the pass-through opening, and a saddle extending across at least a portion of the pass-through opening and supported by at least a portion of the shear pin. The saddle is configured for connecting to at least a portion of the connector. The saddle is movable relative to the housing between a first position and a second position when a force exceeding a predetermined threshold value is applied on the saddle causing the shear pin to shear or break. At least a portion of the indicator region is uncovered in the second position of the saddle when the shear pin shears or breaks.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: June 25, 2019
    Assignee: MSA Technology, LLC
    Inventors: Mitchell H. Hetrich, Mark Hall, Jeffrey Wu, David Bao, James Zhan, Jim Zhan
  • Publication number: 20190069644
    Abstract: A connector includes a frame having a first end, a second end, and a pass-through opening extending between the first end and the second end along a longitudinal axis of the frame. The connector further has a gate positioned between the first end and the second end of the frame and movable between a closed position to close the pass-through opening and an open position to open the pass-through opening. A locking mechanism selectively locks the gate in the closed position. The locking mechanism has a rotatable knob connected to at least one of the first end and the second end of the frame and rotatable in a direction about the longitudinal axis, and a locking indent on the gate configured for receiving at least a portion of the rotatable knob when the gate is in the closed position. The rotatable knob is rotationally biased by a biasing mechanism.
    Type: Application
    Filed: September 7, 2017
    Publication date: March 7, 2019
    Inventors: Mitchell H. Hetrich, Robert Pitt
  • Publication number: 20190070443
    Abstract: A connector includes a frame having a first end, a second end, and a pass-through opening extending between the first end and the second end along a longitudinal axis of the frame. The connector further has a gate positioned between the first end and the second end of the frame and movable between a closed position to close the pass-through opening and an open position to open the pass-through opening. A locking mechanism selectively locks the gate in the closed position. The locking mechanism has a rotatable knob connected to at least one of the first end and the second end of the frame and rotatable in a direction about the longitudinal axis, and a locking indent on the gate configured for receiving at least a portion of the rotatable knob when the gate is in the closed position. The rotatable knob is rotationally biased by a biasing mechanism.
    Type: Application
    Filed: November 20, 2017
    Publication date: March 7, 2019
    Inventors: Mitchell H. Hetrich, Robert Pitt
  • Patent number: 10207128
    Abstract: A fall protection device, including: a housing; a hub rotatable with respect to the housing; a line wrapped around the hub and configured to pay out from and retract into the housing, an engagement mechanism configured to prevent rotation of the hub and further payout of the line; and an adjustment mechanism configured to adjust a length of the line paid out from the housing, the adjustment mechanism comprising: (i) at least one gear attached to the housing; (ii) a pivot having a track configured to interact with the at least one gear and pivot as the at least one gear rotates; and (iii) an arm configured to urge at least a portion of the engagement mechanism causing it to move into an engagement position, to thereby prevent further rotation of the hub and payout of the line from the fall protection device.
    Type: Grant
    Filed: December 28, 2016
    Date of Patent: February 19, 2019
    Assignee: MSA Technology, LLC
    Inventor: Mitchell H. Hetrich
  • Publication number: 20180178044
    Abstract: A fall protection device, including: a housing; a hub rotatable with respect to the housing; a line wrapped around the hub and configured to pay out from and retract into the housing, an engagement mechanism configured to prevent rotation of the hub and further payout of the line; and an adjustment mechanism configured to adjust a length of the line paid out from the housing, the adjustment mechanism comprising: (i) at least one gear attached to the housing; (ii) a pivot having a track configured to interact with the at least one gear and pivot as the at least one gear rotates; and (iii) an arm configured to urge at least a portion of the engagement mechanism causing it to move into an engagement position, to thereby prevent further rotation of the hub and payout of the line from the fall protection device.
    Type: Application
    Filed: December 28, 2016
    Publication date: June 28, 2018
    Inventor: Mitchell H. Hetrich
  • Publication number: 20170291049
    Abstract: A load indicator for use with a fall protection apparatus having a line and a connector for connecting to a user includes a housing having a pass-through opening and a covered indicator region. At least a portion of the housing is configured for connecting to the line. The load indicator also includes a shear pin supported by the housing and extending across the pass-through opening, and a saddle extending across at least a portion of the pass-through opening and supported by at least a portion of the shear pin. The saddle is configured for connecting to at least a portion of the connector. The saddle is movable relative to the housing between a first position and a second position when a force exceeding a predetermined threshold value is applied on the saddle causing the shear pin to shear or break. At least a portion of the indicator region is uncovered in the second position of the saddle when the shear pin shears or breaks.
    Type: Application
    Filed: August 10, 2016
    Publication date: October 12, 2017
    Inventors: Mitchell H. Hetrich, Mark Hall, Jeffrey Wu, David Bao, James Zhan, Jim Zhan
  • Publication number: 20170252591
    Abstract: A line retraction device includes a rotatable drum having a line associated therewith, with the line including a first end directly or indirectly attached to the drum and a second end opposite the first end, and at least one retraction member biasing the drum in a first rotational direction of the drum opposite a second rotational direction of the drum, where the drum is configured to: (i) retract the line when the drum moves in the first rotational direction; and (ii) payout the line when the drum moves in the second rotational direction. The device further including a damper assembly configured to provide rotational resistance to the drum in: (i) the first rotational direction of the drum as the line is being retracted; and (ii) the second rotational direction as the line is being paid out.
    Type: Application
    Filed: March 2, 2016
    Publication date: September 7, 2017
    Inventor: Mitchell H. Hetrich
  • Patent number: 9199103
    Abstract: A fall protection arrangement including a rotatable hub and a lifeline having a first end attached to the hub and a second end for removable attachment to a user, an engagement mechanism to prevent rotation of the hub upon activation, and a braking arrangement to brake the payout of the lifeline during a fall event.
    Type: Grant
    Filed: May 9, 2011
    Date of Patent: December 1, 2015
    Assignee: MSA Technology, LLC
    Inventors: Mitchell H. Hetrich, David J. Losos
  • Publication number: 20110278095
    Abstract: A fall protection arrangement including a rotatable hub and a lifeline having a first end attached to the hub and a second end for removable attachment to a user, an engagement mechanism to prevent rotation of the hub upon activation, and a braking arrangement to brake the payout of the lifeline during a fall event.
    Type: Application
    Filed: May 9, 2011
    Publication date: November 17, 2011
    Inventors: Mitchell H. Hetrich, David J. Losos
  • Patent number: 6142255
    Abstract: A member for connecting a rail to a horizontal element of a ladder. The member comprises a first portion that connects to the horizontal member. The member also comprises a second portion which connects to the rail and extends essentially in parallel with the rail. The second portion is integrally connected to the first portion such that the first portion and the second portion are one continuous piece. The second portion is in an angular relationship of less than 90.degree. with the first portion. A member for connecting a rail having a first rail flange and a second rail flange to a horizontal element of a ladder. The member comprises a first arm which connects to the first rail flange and the horizontal member. The member is also comprised of a second arm which connects to the second rail flange and the horizontal member. Additionally, the member comprises a central body which is integrally connected to the second arm and the first arm.
    Type: Grant
    Filed: June 5, 1997
    Date of Patent: November 7, 2000
    Assignee: Werner Co.
    Inventors: David E. Plotner, Edward E. Heald, Richard P. Sulecki, Frederick J. Bartnicki, Mitchell H. Hetrich
  • Patent number: 5791439
    Abstract: A member for connecting a rail to a horizontal element of a ladder. The member comprises a first portion that connects to the horizontal member. The member also comprises a second portion which connects to the rail and extends essentially in parallel with the rail. The second portion is integrally connected to the first portion such that the first portion and the second portion are one continuous piece. The second portion is in an angular relationship of less than 90.degree. with the first portion. A member for connecting a rail having a first rail flange and a second rail flange to a horizontal element of a ladder. The member comprises a first arm which connects to the first rail flange and the horizontal member. The member is also comprised of a second arm which connects to the second rail flange and the horizontal member. Additionally, the member comprises a central body which is integrally connected to the second arm and the first arm.
    Type: Grant
    Filed: April 21, 1995
    Date of Patent: August 11, 1998
    Assignee: Werner Co.
    Inventors: David E. Plotner, Edward E. Heald, Kevin L. McIntire, Richard P. Sulecki, Mitchell H. Hetrich, Frederick J. Bartnicki
  • Patent number: 5758745
    Abstract: An extension ladder comprises a base section comprising a first base rail, a second base rail in spaced relationship and in parallel with the first base rail, and at least a first base rung connected to the first base rail and the second base rail. The extension ladder also comprises a fly section slidably connected to the base section. The fly section comprises a first fly rail, a second fly rail in spaced relationship and in parallel with the first fly rail, at least a first fly rung connected to the first fly rail and the second fly rail, a first combination end cap/guide bracket connected to the bottom of the first fly rail, and a second combination end cap/guide bracket connected to the bottom of the second fly rail. Each end cap/guide bracket is one continuous piece. The first fly rail is adjacent to and in parallel with and in spaced relationship with said first base rail. The second fly rail is adjacent to and in parallel with and in spaced relationship with said second base rail.
    Type: Grant
    Filed: July 18, 1996
    Date of Patent: June 2, 1998
    Assignee: Werner Co.
    Inventors: Robert D. Beggs, Mitchell H. Hetrich, Christine A. Leipheimer, Marc A. Mabie
  • Patent number: 5636706
    Abstract: A member for connecting a rail to a horizontal element of a ladder. The member comprises a first portion that connects to the horizontal member. The member also comprises a second portion which connects to the rail and extends essentially in parallel with the rail. The second portion is integrally connected to the first portion such that the first portion and the second portion are one continuous piece. The second portion is in an angular relationship of less than 90.degree. with the first portion. A member for connecting a rail having a first rail flange and a second rail flange to a horizontal element of a ladder. The member comprises a first arm which connects to the first rail flange and the horizontal member. The member is also comprised of a second arm which connects to the second rail flange and the horizontal member. Additionally, the member comprises a central body which is integrally connected to the second arm and the first arm.
    Type: Grant
    Filed: July 8, 1994
    Date of Patent: June 10, 1997
    Assignee: Werner Co.
    Inventors: David E. Plotner, Edward E. Heald, Richard P. Sulecki, Frederick J. Bartnicki, Mitchell H. Hetrich