| 摘要 |
Secured to a drive shaft within a housing is a main bevelled gear. Several bevelled drive gears engage the main gear, each being secured to a gear shaft which extends through the exterior of the housing. - Secured to the end of each gear shaft is a gear wheel, which meshes with a similar, free-wheeling gear. A pair of eccentric arms are secured to each pair of meshing gear wheels, their ends being secured to a block. A piston rod is also secured to the block, so that the reciprocal motion of the piston rod may be transferred through the eccentric arms and the gear wheels to the drive gear and the main gear.
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