Patents by Inventor James A. Calderwood

James A. Calderwood 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).

  • Publication number: 20120317848
    Abstract: The present invention relates to an improved ripper boot. In particular, the invention relates to a ripper boot having a male carrier portion for engaging a replaceable female tooth or cap having a high tensile tip. The taper lock formed between the cap and carrier ensures that the replaceable ripping cap does not rotate and particulate matter is prevented from entering between walls of the cap and carrier. The ripper boot of the present invention is suitable for use in a range of applications involving the ripping or cleaving of extremely hard material.
    Type: Application
    Filed: December 10, 2010
    Publication date: December 20, 2012
    Inventor: James A. Calderwood
  • Patent number: 8104199
    Abstract: A ripper boot to cleave through hard ground. A carrier portion is connected to a shank of a vehicle. A tooth portion is integral or removably engaged with the carrier portion including a longitudinal axis and a socket at a working end. The socket extends partially into the working end including a base and one or more side walls extending forwardly of the base. The side walls extend parallel with or at a slight angle relative to the longitudinal axis. A high tensile tip includes a shaft and a conical head to extend out of the tooth portion to form a first point of contact between the tooth portion and the ground. The shaft includes a corresponding number of walls to that of the socket. The shaft of the high tensile tip is locked inside the tooth portion socket by press fitting.
    Type: Grant
    Filed: August 22, 2007
    Date of Patent: January 31, 2012
    Inventor: James A Calderwood
  • Publication number: 20100269379
    Abstract: The present invention relates to an improved ripper boot which includes a carrier section, and a ripper tooth section having a high tensile tip adapted to be press fit into a contact end thereof. In operation, the carrier section is placed over and conformed to fit over a ripper boot shank of a bulldozer, or one or more excavator loader bucket shanks. In using a press fit high tensile tip, less maintenance is required on the ripper boot during operation, which means that the machinery does not need to idle so often, saving considerable time and expense. The reason for this is that the tip is made of a high tensile metal such as tungsten which is less susceptible to wear and tear so it can be used for considerably longer periods before it becomes worn. Furthermore, hard and abrasive rock in front of the tungsten tip has been found to “explode” in its path resulting in the location of precious stones which would otherwise have been missed using conventional equipment.
    Type: Application
    Filed: August 22, 2007
    Publication date: October 28, 2010
    Inventor: James A. Calderwood
  • Patent number: 7757778
    Abstract: Ripper boots of the type adapted to be mounted to a bulldozer tyne for use in cleaving through hard ground. The ripper boot includes a replaceable ripping tooth which is secured within the boot by interference fit so that during use, it does not rotate. The replaceable ripping tooth may be angled upwardly with respect to the carrier so that the angle of attack of the ripping tooth is raised so that it is almost parallel with the ground.
    Type: Grant
    Filed: August 24, 2006
    Date of Patent: July 20, 2010
    Inventor: James A. Calderwood
  • Publication number: 20080229627
    Abstract: The present invention relates to improvements to ripper boots of the type adapted to be mounted to a bulldozer tyne for use in cleaving through hard ground. The ripper boot embodied in the present invention has particular application in opal mining where sometimes extremely hard ground is to be penetrated and ripped. The ripper boot includes a replaceable ripping tooth which is secured within the boot by way of an interference fit so that during use, it does not rotate. The interference fit prevents particular matter from entering between the walls of the tooth and the associated socket. In further forms of the invention, the replaceable ripping tooth is angled upwardly with respect to the carrier so that the angle of attack of the ripping tooth is raised so that it is almost parallel with the ground. The ripper boot provides a number of benefits including improved cleaving effect, reduced chatter and drag, reduced wear and tear, and reduced load on associated machinery.
    Type: Application
    Filed: August 24, 2006
    Publication date: September 25, 2008
    Inventor: James A. Calderwood