E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
E21D 20/00 (2006.01) E21B 15/04 (2006.01)
Patent
CA 2248563
An improved feed shell positioning mechanism (100) for a rock drilling machine, having a boom (104), a feed shell support (106) pivotably mounted with respect to the boom (104) and supporting a feed shell (102) having a feed shell axis (108), a roll actuator (114) interposed between the boom (104) and the feed shell support (106), and a rock drill (118) having a rock drill axis (120). The rock drill axis (120) and the feed shell axis (108) are parallel and define a reference plane (122). The improvement resides in a swivel assembly (124) for attaching the feed shell support (106) to the roll actuator (114), allowing the feed shell support (106) to swivel between a forward drilling orientation and a sideways drilling orientation. The swivel assembly (124) has a roll actuator securing element (126), mounted to the roll actuator (114), and a feed shell support securing element (128), mounted to the feed shell support (106), which are pivotably mounted to each other about a swivel pivot axis (130) which is inclined with respect to the reference plane (122). With the swivel pivot axis (122) so inclined, the drill axis (120) is moved into closer proximity to a roll actuator axis (116) when pivoted to the sideways drilling orientation, providing a reduced moment arm for forces generated by the rock drill (118).
Cannon Industries Inc.
Oldenburg Cannon Inc.
Ridout & Maybee Llp
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