Abstract: PCT No. PCT/US79/00133 Sec. 371 Date Mar. 5, 1979 Sec. 102(e) Date Mar. 5, 1979, PCT Filed Mar. 5, 1979 PCT Pub. No. WO 80/01927 PCT Pub. Date Sept. 18, 1980A router bit assembly (18,22) for the sides (20,24) of the bowl (10) of an earthmoving machine (12). The router bit assembly is of two-piece construction and includes a router bit (42) and a holder (26) which, when secured to the vertical side walls (20,24) of the bowl (10), captures the bit (42) between the holder (26) and the vertical side wall (24). The rear edge (56) of the bit (42) is held against the leading edge (58) of the corner (25) of the vertical side wall (24) by the holder (26). The two-piece router bit assembly advantageously reduces the amount of metal that is discarded when the life of the bit is expended.

Abstract: PCT No. PCT/US79/00090 Sec. 371 Date Feb. 15, 1979 Sec. 102(e) Date Feb. 15, 1979, PCT Filed Feb. 15, 1979, Ser. No. 30,244. A router bit assembly for an earth working apparatus (10, 12) including earth working means having a generally horizontally elongated blade (18) with a generally vertically extending side member (22) at at least one end of the blade, a relatively tall router bit (32) formed of plate metal extending along the side member and in proximity to the blade, a relatively short support (34) for the router bit interposed between the router bit and the side member and having a first lip (36) overlying and substantially abutting the upper extremity (38) of the router bit and a second lip (40) underlying the lower extremity (30) of the side member, and removable bolts (50) securing the router bit and the support to the side member.

Abstract: An earthworking device such as a power scraper has a cutting edge assembly which may be mounted to give either a straight or a crenellated edge. The assembly consists of several identical long, narrow, rectangular members which have chamfered longitudinal marginal portions and are mounted alternately with the chamfers facing up and facing down, and the latter chamfers overlying the former. Threaded bolts impale holes near one end of the members which have their chamfers down so as to secure those members to the top surface of the scraper blade and frictionally clamp the other members to the blade.