Rock milling cutter tongue and slot connected
AssigneeSandvik Aktiebolag
InventorErik A. Persson
Life of this patent
Estimating the term…
Abstract
A plurality of cutter tool holders are mounted to a milling cutter head by tongue and groove connections. Each connection comprises a groove formed in the cutter head and a tongue formed on the tool holder. The groove has an undercut portion and an enlargement at one end. The tongue includes a projection which can be inserted into the enlargement and then into the undercut to prevent, via wedging action, dislodgement of the tool holder. The groove and tongue each includes a side wall which is straight along its height.
Claims5
An assembly of a milling cutter head and cutter tool holders for a rock drilling machine, each holder mounted by a tongue and groove connection comprising:
- an outwardly open groove formed in said cutter head, said groove including opposite side walls each extending from a front end to a rear end of said groove, one of said side walls being substantially straight along its height, said other side wall including a first projection extending laterally toward said one side wall,
- said first projection including a first contact surface forming therebeneath an undercut portion of said groove extending in a front-to-rear direction,
- said first projection terminating short of said front end of said groove to define an enlarged opening,
- said cutter head including a second contact surface spaced outwardly of said first contact surface and extending at an angle relative thereto, and
- a tongue comprising an extension of said tool holder, said extension including opposite side walls spaced by a distance less than the distance between said first projection and said one side wall of said groove, one of said side walls of said extension extending substantially straight to the end of said extension, the other of said side walls of said extension including a second projection extending laterally in a direction away from said one side of said extension, said second projection including a third contact surface,
- said tool holder including a fourth contact surface spaced from said third contact surface and extending at an angle relative thereto, which spacing and angle corresponds substantially to that defined by said first and second contact surfaces,
- said enlarged opening to said groove being sized to receive said extension and said second projection such that upon movement of said tool holder toward said rear end of said groove, said extension travels between said first projection and said one wall of said groove and said second projection travels along said undercut portion of said groove, with said first and third contact surfaces and said second and fourth contact surfaces contacting one another to wedgingly secure said tool holder to said cutter head.
Dependencies are inferred from the claim text.