The engravings herewith illustrate a new form of mixing or pugging
machine for making mortar or any other similar material. It has been
designed by Mr. R.R. Gubbins, more especially for mixing emery with
agglutinating material for making emery wheels; and a machine is at
work on this material in the manufactory of the Standard Emery Wheel
Company, Greek Street, Soho. The machine is shown in perspective in
Fig. 1 with the side door of the mixing box let down as it is when the
box is being emptied; and in Fig. 2 it is shown in transverse section.
The principle of the machine is the employment of disks fixed at an
angle of about 45 deg. on shafts revolving in a mixing box, to which a
slow reciprocating movement of short range is given.
[Illustration: FIGS. 1 and 2--IMPROVED MORTAR MIXING
MACHINE.]
In our illustrations, C is a knife-edge rail, upon which run grooved
wheels supporting the pugging box. To the axle of one grooved wheel a
connecting rod from crank arm, F is attached to effect the to-and-fro
motion of the mixing box, B. G is the door of the box, B, hinged at H,
and secured by hinged pins carrying fly nuts. A cover and hopper and
also a trap may be supplied to the box, B, for continuously feeding
and discharging the material operated upon. L, L, are the pugging
blades or discs on shafts, M. The shafts, M, pass through a slot in
the box, B, and the packing of these shafts is effected by the face
plate sliding and bearing against the face on the standard of the
machine. P is a guide piece on the standard, against which bears and
slides the piece, Q, bolted on to box, B, to support and guide the
box, B, in its movement. The forked ends of a yoke engage with the
collars, S, on the shafts, M, this yoke being set by a screw so that
the shafts may be easily removed. The machine is driven from the
pulleys and shaft, T, through gearing, T2 and T3, and by the Ewart's
chain on the wheel and pinion, V and U.--_The Engineer._
* * * * *
[Continued from SUPPLEMENT, No. 311, page 4960.]