Abstract: A marine propulsion device includes a propeller, a propeller shaft, a bushing, a damper, and a spacer. The propeller shaft supports the propeller. The bushing is between the propeller and the propeller shaft and is unitarily rotatable with the propeller shaft. The damper is fixed to the bushing to transmit rotation of the propeller shaft to the propeller. The spacer is spaced apart from the propeller in a back-and-forth direction in front of the bushing to position the bushing in place with respect to the propeller shaft.

Abstract: An outboard motor includes a drive shaft, a coupling to connect a first shaft and a second shaft of the drive shaft together, and a transmission including a dog clutch to transmit a rotation of the drive shaft to a propeller shaft. The coupling includes a first portion attached to the first shaft, a second portion attached to the second shaft, and a damper. The first portion includes first claws arranged along a rotation direction of the drive shaft. The second portion includes second claws between adjacent ones of the first claws in the rotation direction. The damper includes an elastic portion interposed between adjacent ones of the first claws and the second claws in the rotation direction.

Abstract: A jaw crusher for crushing stones or rocks of large mass in which a movable jaw is driven, on the fulcrum of a swingable supporting rod which supports the lower portion of said movable jaw, by means of swingable arms of a lever pivoted to the upper portion of the movable jaw through a lever mechanism which is moved by hydraulic cylinders. The stationary jaw is separated into two sections, so that the upper stationary jaw may be fixed at optional positions by virtue of means for freely advancing or withdrawing said jaw in horizontal directions.