SPECIAL GEAR DRIVE FOR MIXERS
Page 26
If you've noticed an error in this article please click here to report it so we can fix it.
GEAR drive for the mixer drum is used in a range of truck-mounted concrete mixers now being made by Davies Brothers (Denton) Ltd., 42 Hyde Road, Denton. Manchester. The mixers are sold under the name Mancunian.
The design is unusual in that the gear drive for the drum is taken from a fabricated transfer gearbox interposed in the vehicle's transmission line, behind the gearbox. The added transfer box has a separate selector lever mounted at the side of the chassis so that the mixer drum can be driven while the vehicle is stationary. as well as driven slowly to agitate the load while the • vehicle is moving. To allow this gear selection from the side of the chassis there is also a lever connected to the vehicle's clutch.
There are three selector positions: one for charging, a reduced speed for agitating and a reverse speed for discharging. The concrete is discharged by the screw action of the vanes inside the drum, the vanes being a topped T-section to give clean discharge of stiff mixes, which tend to climb up the sides of the vanes.
A separate gear lever in the cab selects neutral or drive in the transfer box.
Either complete mixer plants (complete with water tank) or plain agitators (for wet concrete) can be supplied. A 4-cu.-yd. mixer plant weighs about 3+ tons. There are also 6and 8-cu.-yd. models for multi-wheeled chassis. The usual price for a 4-cu.-yd. model is £1,820.