Patents by Inventor Axel Henry Jagerstrom

Axel Henry Jagerstrom 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).

  • Method of and arrangement for controlling the speed of the movements of hydraulic booms
    Patent number: 3973747
    Abstract: A method of and arrangement for controlling the speed of the movements of hydraulic booms and of members attached thereto, wherein the movements are performed by hydraulic motors and the return flow from the motors is throttled in one or more steps for adjusting the speed in a stepwise manner. The invention may to advantage be used for controlling the movements of a supporting member for a rock drilling machine, such as a boom or a feed bar, whereby the supporting member is moved by a pressure fluid actuated cylinder and the return flow from the cylinder is throttled in the above manner.
    Type: Grant
    Filed: October 18, 1974
    Date of Patent: August 10, 1976
    Assignee: Atlas Copco Aktiebolag
    Inventor: Axel Henry Jagerstrom