Patents by Inventor Alfred B. Castle

Alfred B. Castle 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: 4490088
    Abstract: Tool for vertically lifting and maneuvering objects such as utility access covers. A pair of spaced-apart ring assemblies including inner and outer concentric independently rotatable rings are connected to each other by a first connecting member which extends over the object. The object is engaged to the tool by hooks suspended from the first connecting member. The ring assemblies are also connected by a second connecting member which is spaced from the first connecting member by a distance sufficient to permit a lever to be engaged to both connecting members so that when a force is applied to the lever, both connecting members move causing simultaneous rotation of the inner rings while the outer rings remain stationary, to vertically lift the object into the space between the ring assemblies. The object while suspended between the ring assemblies is then transportable by rotation of the outer rings with respect to the inner rings.
    Type: Grant
    Filed: March 23, 1982
    Date of Patent: December 25, 1984
    Inventor: Alfred B. Castle
  • Patent number: 4321003
    Abstract: Tool for vertically lifting and maneuvering objects such as utility access covers. A pair of spaced-apart ring assemblies including inner and outer concentric independently rotatable rings are connected to each other by a connecting member which extends over the object. The object is engaged to the tool by hooks suspended from the connecting member. A lever is connected to the connecting member so that when a force is applied to the lever the connecting member rotates causing simultaneous rotation of the inner rings while the outer rings remain stationary to vertically lift the object into the space between the ring assemblies. The object while suspended between the ring assemblies is then transportable by rotation of the outer rings with respect to the inner rings.
    Type: Grant
    Filed: March 19, 1980
    Date of Patent: March 23, 1982
    Inventor: Alfred B. Castle
  • Patent number: 4227731
    Abstract: A lifting tool suitable for lifting and maneuvering utility access covers, especially manhole covers, including a handle and an arcuate receiving means connected to the handle for receiving and securely retaining the utility access cover during lifting and maneuvering thereof. The cover abuts against an abutment means when it is received in the receiving portion, and a hook is pivotally connected to the abutment means for engaging the tool with the cover. When the cover is engaged with the tool, it cannot accidentally become disengaged and injure the operator, and the provision of a support plate on the bottom of the tool facilitates complete control over the movement of the tool when the cover is engaged therewith.
    Type: Grant
    Filed: October 1, 1979
    Date of Patent: October 14, 1980
    Inventor: Alfred B. Castle
  • Patent number: 4154071
    Abstract: The auxiliary locking mechanism of my prior U.S. Pat. No. 3,894,416 is more securely detended and greatly simplified in construction by forming the locking part of the mechanism that is to engage the surrounding metal as a rectangular body and forming a rectangular recess in the part of the surrounding metal that is to be engaged by the aforesaid locking part. The locking part is movable axially of the remainder of the mechanism so that when the mechanism is inserted into a rectangular opening in the side of the body remote from the rectangular recess, the locking part may be depressed and rotated to be aligned with the recess and then released so that it becomes seated in the recess and is securely detented.
    Type: Grant
    Filed: February 22, 1977
    Date of Patent: May 15, 1979
    Inventor: Alfred B. Castle