Patents Represented by Attorney Charles Silberberg
  • Patent number: 5090666
    Abstract: An improved cable hoist apparatus has a sheave movably connected relative to a frame to bias the cable in a circumferential groove in the sheave. A biasing means on the frame compresses the cable in the sheave groove with the amount of force depending upon the tension in the cable. In this regard, the sheave is positioned relative to the frame as a function of the cable tension such that the greater the cable tension, the greater the biasing force on the cable. However, the biasing means can include a plurality of rollers to regulate the biasing force. A reeving spring can be used in conjunction with the biasing means to allow reeving of the hoist when the cable is unloaded. The hoist apparatus optimally incorporates certain advantageous safety features. These include a cable brake activated and released depending upon the position of the sheave and a motor shutoff as a function of overload and/or underload.
    Type: Grant
    Filed: July 17, 1990
    Date of Patent: February 25, 1992
    Inventor: Marvin M. May
  • Patent number: D295428
    Type: Grant
    Filed: April 13, 1987
    Date of Patent: April 26, 1988
    Inventor: Darold B. Cummings
  • Patent number: D295989
    Type: Grant
    Filed: February 13, 1987
    Date of Patent: May 31, 1988
    Inventor: Darold B. Cummings
  • Patent number: D328266
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: July 28, 1992
    Inventor: Darold B. Cummings
  • Patent number: D338054
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: August 3, 1993
    Inventor: Darold B. Cummings
  • Patent number: D357215
    Type: Grant
    Filed: January 24, 1994
    Date of Patent: April 11, 1995
    Inventor: Darold B. Cummings