Abstract: An apparatus for digging a trench including (a) a substantial vertical guide means (2); (b) mounting means (4) connected to the guide means (2) and movable substantially parallel to the guide means (2); (c) first drive means to move the mounting means (4) relative to the guide means (2); (d) a chain digger attachment (1) including an elongated frame (5) and a continuous digging chain (6) substantially surrounding the periphery of the frame (5), the attachment (1) being pivotally connected at or adjacent one of its ends to the mounting means (4); (e) second drive means (15) to rotate the continuous digging chain (6) about the frame (5); and (f) third drive means (24) to pivot the attachment (1) about the mounting means (4).

Abstract: A cutting tooth is fitted in a cutting-tooth holder of an earthworking appliance which has at least one cutter. The cutter is mounted ahead of a cutter-support region, as seen in the cutting direction, and has at least one cutting edge. The size of the cross-sectional areas of the cutter-support region which lie perpendicular to the cutting advance direction and intersect the cutting edge remains approximately constant in the area which is delimited by in each case two such cross-sectional areas.

Abstract: Apparatus for locally disturbing an underwater bed to enable the burial of an elongate member (39) comprises a mounting (30,31), resilient means (88-93) such as brush filaments coupled to the mounting, and means (9) for moving the resilient means with respect to the mounting. The resilient means is constructed such that on moving the mounting along the line of the elongate member while moving the resilient means with respect to the mounting, the underwater bed is disturbed by the resilient means to enable the elongate member to be buried.

Abstract: The present disclosure relates to a cutting tooth for a trencher chain. The tooth includes a base portion aligned along a first plane. The base portion includes structure for allowing the cutting tooth to be connected to the trencher chain. The tooth also includes a distal portion that is generally obliquely aligned with respect to the first plane. A curved transition is located between the distal portion and the base portion. The curved transition curves away from the first plane and at least partially forms a cupped portion that extends from a leading end to a trailing end of the cutting tooth. The tooth also includes a hardened tip positioned at a region of the leading end that is located farthest from the first plane.

Abstract: Bucket dredger, comprising: a swivelling ladder connected to a vessel, a driven upper wheel at the top end and a polygonal lower wheel (7) at the lower end of the ladder, one or more endless chains (6) which are guided along both wheels, and buckets (9) connected to the shackles (8) of these chains (6). For receiving the lateral force exerted on a bucket the bottom wall (12) of each bucket (9) is provided with two ribs (15) extending downwardly, which extend substantially parallel to the side walls (14) of the bucket and which, in the assembled state of the bucket, extend adjacent the chains (6) and between the chains and upright edges (16) placed on the lower wheel (7). The ribs (15) can extend along the length of two shackles (8).

Abstract: A trencher includes a frame. Ground engaging wheels and a chain are mounted on the frame. Sleeves are attached to and extend outwardly from the chain. Rotatable and fixed-orientation teeth can be mounted in the sleeves.

Abstract: An excavating machine includes a main frame, an endless digging chain, and a boom. The boom is mounted to the main frame and is adapted to carry the digging chain. The boom includes an upper surface, a lower surface, an inner end and outer end. The surfaces are adapted to slidably engage the chain. A drive sprocket is mounted to the main frame and is disposed at the inner end of the boom for engaging the chain. A wear plate is mounted to the boom and is disposed between the drive sprocket and the inner end of the boom for slidably engaging the chain between the drive sprocket and the upper surface of the boom inner end.

Abstract: A tooth attachment for earth working equipment which is configured to receive a conventional cutter bit. The tooth attachment includes a body which defines an upper end and a lower end. The upper end defines a bit holder configured to receive a conventional cutter bit and the lower end is configured to be releasably securable to the post of an implement of earth working equipment such as dragline equipment, a backhoe, a bulldozer, a grader or the like.

Abstract: A shaping apparatus for the working/maintenance of a snow-boarding half-pipe. The apparatus comprises a framework with a curved portion serving to support and guide a pair of drive chains actuated to run over an endless path. To the drive chains are attached scraper elements adapted to extend perpendicularly outward from the endless path of the chains, the scraper elements being designed to cut away snow from the half-pipe surface to be shaped. The scraper elements further incorporate elements serving to move the detached snow along the shaped surface and to smooth the surface. The apparatus is intended for attaching to a self-actuated vehicle, to be powered therefrom.

Abstract: A method of operation to effectively excavate an underdrain in the field ground having a long service life and ensuring that the underdrain will not be closed after a long period of time and a device for such operation. The method includes attaching a plurality of buckets to an endless chain, driving the endless chain to excavate a slit in the field ground, reforming inner side walls of the slit by a reformer, pressing soil from both sides of the slit later ally inwardly by a pressing member attached to the reformer to form a block to separate the slit into an upper space and a Iover space, and charging the upper space with discarded dirt.

Abstract: A snow blower is provided with cutting devices which are housed within, but project beyond, a housing provided for the blower's auger. As the cutting devices engage snow during the blower's advance, the cutting devices move in a direction which tends to urge the forward portion of the blower downwardly.

Abstract: An excavating and conveying chain assembly for transporting ballast of a track includes a plurality of chain links hingedly connected to each other for traveling along a transport path. Connected to each chain link is a scraper blade which has a link-distal end formed with a plurality of projecting scraper fingers. Each scraper finger is of two-part configuration, with a first part being formed by an engagement member secured to the scraper blade and jutting out therefrom in a finger-like manner, and with a second part being formed by a protective cap that is pushed onto the engagement member and detachably secured thereto by a fastener.

Abstract: A cutting chain is provided which includes facing inner side bars (12) and outside members (14) which have substantially the same height. Further, the leading inner ends of the inner side bars (12) and the trailing inner end of the outside members (14) have a reduced radius to increase wear life while giving the chain a preferred direction of travel.

Abstract: An endless driven sprocket chain (10) includes inner links (24) which couple to outer links (26) through a resilient bushing (50). A pin (42) having a shaft (44) with a hexagonal cross sectional shape mates with a corresponding hole in outer link plates (32, 34). The shaft (44) also mates with a hexagonal cross sectional shaped hole in the bushing (50) through an metallic insert (56). The bushing is pressed into a metallic sleeve (58) which in turn is press fit into inner link plates (28, 30) at holes (36) therein. The hexagonal alignment of the holes (40) in the outer link plates (32, 34) with the corresponding hole (54) in bushing 50 defines a resting position where the inner links (24) reside at an oblique angle to the outer links (26). When the inner links (24) form a substantially straight line with the outer links (26) the bushing is deformed and imposes a force of the links (24, 26) that urges the links (24, 26) toward the resting position.

Abstract: An excavator for forming an underground continuous wall includes a traveling trolley movable on a ground and an upper frame constructed on the trolley. The excavator further includes a guide post vertically extending and vertically movably provided at one side of the upper frame on the trolley and variable in length by supplementary extension guide post members detachably connectable thereto through flanges. Chain sprockets rotatably provided on the guide post at its upper and lower ends and at one end rearward of the chain sprocket at the upper end of the guide post, respectively. An endless chain extends around the chain sprockets to be driven by rotation of at least one of the chain sprockets. A number of excavator buckets are provided on the endless chain therealong spaced at suitable intervals to form an endless chain bucket type cutter.

Abstract: Apparatus for forming a trench in the ground includes a frame having ground engaging wheels, a boom attached to and extending outwardly from the frame, a chain which extends around the periphery of the boom, a plurality of cutting teeth mounted on the chain, and a motor mounted in the frame for driving the chain around the boom. The cutting teeth are mounted on the chain in a canted orientation which extends the useful life of the teeth.

Abstract: A sidebar is provided for an offset sidebar trenching chain. The sidebar has an inner edge which slides along a boom of a trenching machine, when the trenching chain is in use. The sidebar is induction hardened through a portion thereof extending from the inner edge, for increased resistance to wear due to friction.