Improvements in Apparatus for Grinding the Crank Pins of Locomotives.
Year: 1898

page_text: Date of Application, 9th Sept., 1898—Accepted, 26th Nov., 1898
Communicated from abroad by HARRY PEARSE, of Campana, in the Argentine
Republic, South America, Locomotive Engineer.]
Improvements in Apparatus for Grinding the Crank Pins of
Locomotives.
I, LUDFORD CHARLES DOCKER, of the Birmingham Varnish Works, Rotton Park
Street, Birmingham, in the County of Warwick, Manufacturer, do hereby declare
the nature of this invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following
statement:
By constructing the crank pin grinding machines as hereinafter described the
following advantages are obtained over all other machines now in use for the same
purpose, namely. Firstly a pair of crank pins in position can be centred trued up
and the angle corrected to a. nicety, a hard smooth skin remaining thereon;
secondly the pins previously hardened to any extent desired may be ground by
this process. Thirdly a pair of pins can be centred and trued up in much less time
than is possible with the existing portable machines generally in use; and fourthly
no errors can exist in the angles of the cranks after being trued up. And the
pins are ground perfectly true, which cannot be guaranteed by the existing
machines.
.
I will now describe the machine with the aid of the accompanying sheets of
drawings on which
Fig. 1 illustrates a double head machine.
Fig. 2 a single head machine.
And Fig.
is a cross sectional view on the line a-a drawn to double the scale
of Figs. 1 and 2.
Similar letters of reference on the several sheets of drawings refer to similar
parts.
It will be seen that the machine can be made either with a single head Fig. 2,
or a double head Fig. 1.
In either case the locomotive wheels are supported by the standards V V fixed
to the bed plate X the distance between the centres of the standards being as
nearly as possible equal to the distance between the centres of the axle
journals.
By means of the adjusting screws Y Y the axle can be raised or lowered or
moved from side to side for the purpose of setting and it is held in position by
the clamps A¹ A¹.
Each head of the machine consists of the following parts
A cylinder A which is revolved in the casting B by means of the worm C and
tooth wheel D, the driving pulley being fixed to the spindle which carries the
worm and tooth wheel D formed solid with a slieve through which the cylinder A
can. be. moved backwards & forwards longitudinally there being fixed on the
interior face of the slieve a key which engages with a keyway cut on the
cylinder A. Within this cylinder with its axis parallel to but on a different centre
to the same, is another smaller cylinder E, through the open end' of which is

page_text: carried the spindle F the axis of which is parallel with those of the two
cylinders, and the distance between its centre, and the centre of the cylinder E
is equal to the distance between the centre of the latter, & the centre of the
cylinder A.
On the front end of the spindle F is fixed the emery stone G, and to the other end
a pulley H is driven independently from the counter shaft.
The feed for the emery wheel G is provided for as follows:
On the front end of the cylinder E projecting through the cylinder A is fixed a
tooth wheel K which by means of a screw L can be turned round so as to place the
centre of the spindle I nearer or further from the centre of the cylinder A.
The longitudinal motion of the cylinder A is obtained from the eliptical tooth
wheel O shewn in dotted lines Fig. 1 which has a slot way extending across its face
through its centre. The cylinder A is connected with this wheel by means of the
guide N in which it revolves the connecting rod M and a pin which fits loosely in
the slot way and in which it can be fixed at any desired distance from the centre of
O thus giving the length of the stroke required. The other end of the connecting
rod is arranged so that the guide N can be secured in any position on it. The
eliptical tooth wheel O is driven by another similar tooth wheel G the distance
between the centres of which being equal to half the sum of the transverse and
conjugate diameters. This wheel G¹ is revolved by means of the tooth wheel P
driven by the worm Q this being revolved by the tooth wheel R driven by the
worm C.
The cylinder A can also be moved backwards or forwards by hand independently
by means of the handle and screw F¹ which can be thrown out of gear when not
required.
In the front end of the cylinder A on the centre line of same is placed a movable
centre S passing through the cylinder E and on the casting B another centre T the
distance between the two being equal to the correct throw of the crank and the
line through their centres at an angle of 45 degrees with the horizontal plane.
The double headed machine has moveable centres as described above on each
head the centres T T being opposite each other and the centres S S on the other side
of the same.
In the single headed machine the place of the second head is taken by a poppet
head B¹ which carries two centres Ti and S₁ corresponding to the two centres T
and S in the second head of the double machine.
The lower part of the casting B forms a tank and in a convenient position on
this casting is fixed a centrifugal pump E' from which by means of a rubber tube
a continual stream of water can be supplied to the emery stone G.
These double or single headed machines should in all cases have the heads firmly
bolted to the foundation and not made adjustable in any way to take cranks of
different throws except to the extent of 1" or so, because if made adjustable the
exactitude of the angle and throw of the cranks might be destroyed through
careless adjustment of the machine by the workman in charge.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
Apparatus consisting of single or double headed machines constructed substan-
tially as described and illustrated for the purposes of grinding centreing and trueing
up crank pins and correcting the angle thereof.
DJ
11111
1000
HENRY F. TALBOT,
30, Temple Street, Birmingham, Agent for the Applicants.