Patents by Inventor Willem D. van Zelm

Willem D. van Zelm 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: 4613179
    Abstract: An improvement to a gripping device for handicapped persons provides a three-point lateral restraint. The structure for accomplishing this restraint includes a thumb support element, a wrist brace element and an arm support element. These respective elements may be quickly mounted on either side of the device, thereby enabling the device to be used by either right-handed or left-handed persons. A lanyard including a noose is also provided to faciliate convenient manipulation of the gripping device by the free hand of the user. A toggle mechanism includes an over-the-center spring for controlling a pair of gripping tongs.
    Type: Grant
    Filed: February 13, 1985
    Date of Patent: September 23, 1986
    Inventor: Willem D. van Zelm
  • Patent number: 4374600
    Abstract: The invention is an improved lock for a gripping device, for use by handicapped persons, with a lock-type member to improve safety. The gripping device consists of double acting jaws that grips the item to be picked up or lifted, a forward arm section, a rearward arm section, and a control mechanism to control the gripping action of the double acting jaws and the hinge action between the forward arm section and the rearward arm section. A lock-type safety member for the hinge action improves the safety factor when using the device. The device with the lock-type safety member can be operated with one hand. It can also be operated from a wheel chair.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: February 22, 1983
    Inventor: Willem D. van Zelm
  • Patent number: 4231603
    Abstract: The invention is an improved gripping device for use by handicapped persons. The gripping device consists of double acting jaws that grips the item to be picked up or lifted, a forward arm section, a rearward arm section, and a control mechanism to control the gripping action of the double acting jaws and the hinge action between the forward arm section and the rearward arm section. The device can be operated with one hand. It can also be operated from a wheel chair.
    Type: Grant
    Filed: February 15, 1979
    Date of Patent: November 4, 1980
    Inventor: Willem D. van Zelm