Patents by Inventor Ellsworth W. Lapp

Ellsworth W. Lapp 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).

  • Three-position, four-way rotary valve with pistol grip actuator
    Patent number: 5465755
    Abstract: A valve member of a three-position, four-way valve is supported to rotate in opposite directions about a predetermined axis from a neutral position to first and second active positions. The valve member is moved between such positions by a manually operable actuator mounted on a pistol grip handle and adapted to be pivoted between a neutral position and first and second actuated positions about an axis offset from and extending perpendicular to the rotational axis of the valve member.
    Type: Grant
    Filed: June 13, 1994
    Date of Patent: November 14, 1995
    Assignee: Hydraulic Tool Engineering, Inc.
    Inventor: Ellsworth W. Lapp
  • Hydraulic amplifier
    Patent number: 4366673
    Abstract: A hydraulic amplifier having a hydraulic motor adapted to drive a high pressure pump for boosting the pressure of low pressure fluid and for supplying high pressure fluid to a hydraulic actuator. The motor also drives a scavenging pump for overcoming high back pressure in the return side of the system. The amplifier is controlled by two valves which may be actuated by manually operating a single lever.
    Type: Grant
    Filed: December 23, 1980
    Date of Patent: January 4, 1983
    Inventor: Ellsworth W. Lapp
  • Three-position, four-way rotary valve
    Patent number: 4342332
    Abstract: Openings and passages are formed in the valve disc to enable the disc to rotate to active positions on either side of a neutral position upon being moved through a relatively small angle of 30 degrees. The valve disc is adapted to be rotated by a pivoted actuator whose motion is amplified to enable the actuator to rotate the valve disc through its 30 degree angle when the actuator is pivoted through an angle of 15 degrees.
    Type: Grant
    Filed: August 21, 1980
    Date of Patent: August 3, 1982
    Inventor: Ellsworth W. Lapp
  • Crimping tool
    Patent number: 4292833
    Abstract: A tool for radially crimping a piece of electrical conduit or the like with opposed crimping dies having concavely curved die cavities. Dies of one type are held releasably within die holders, one of which is movable toward the other. The tool also may be used with a different type of dies which are adapted to seat within the die cavities of the first dies. The first dies thus may be used selectively either as dies or as die adaptors.
    Type: Grant
    Filed: June 22, 1979
    Date of Patent: October 6, 1981
    Inventor: Ellsworth W. Lapp
  • Device for absorbing shock in a cable
    Patent number: 4106164
    Abstract: The two overlapped end portions of a tensioned cable are secured together by a clamp having a resiliently yieldable strap which is bowed so as to permit elongation of the cable when the latter is subjected to shock loads.
    Type: Grant
    Filed: October 26, 1976
    Date of Patent: August 15, 1978
    Inventor: Ellsworth W. Lapp
  • Cable tensioning device
    Patent number: 4014518
    Abstract: One end portion of a cable is gripped by one head and the opposite end portion of the cable is gripped by another head prior to the heads being spread apart to pull the cable end portions in opposite directions and impart tension to the cable. Without losing the initially imparted tension, one head may be released from and returned reversely along the cable and then may be shifted through another active stroke to place additional tension in the cable.
    Type: Grant
    Filed: February 23, 1976
    Date of Patent: March 29, 1977
    Inventor: Ellsworth W. Lapp
  • Cable tensioning device with improved loading and removal capability
    Patent number: 4013266
    Abstract: Two spaced heads carry gripping and pulling elements which clamp and tension the two lapped end sections of a cable when the heads are spread apart by linear actuators. The heads are formed with downwardly opening cable-receiving throats which enable the cable to be loaded into the tensioning device simply by placing the device over the cable.
    Type: Grant
    Filed: March 4, 1976
    Date of Patent: March 22, 1977
    Inventor: Ellsworth W. Lapp
  • Hydraulic pressure amplifier
    Patent number: 3952516
    Abstract: A hydraulic pressure amplifier with a scavenging pump operable to establish a negative return line pressure to effect a positive and rapid return of the rod of a one-way hydraulic actuator and thereby eliminate the necessity of third line-type systems that depend on gravity and/or spring-loaded actuators to return the hydraulic fluid to the tank.
    Type: Grant
    Filed: May 7, 1975
    Date of Patent: April 27, 1976
    Inventor: Ellsworth W. Lapp