Improvements in Portable Raminers for Foundry Moulds.
Year: 1898

page_text: Date of Application, 13th Dec., 1898-Accepted, 28th Jan., 1899
COMPLETE SPECIFICATION.
Improvements in Portable Raminers for Foundry Moulds.
I, JOSEPH C. CRAMP, of 1,344, Eyre Street, in the City and County of Philadelphia,
State of Pennsylvania, one of the United States of America, Mechanical Engineer,
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 :-
In preparing foundry moulds for castings, the sand or earth is rammed usually
by hand.
To prevent the molten metal from spreading beyond the limits of the mould, it
is essential that the sand or earth should be both closely and uniformly rammed.
In ramming by hand however, there is great variation in the force of the blows
delivered and consequently some portions of the mould are closely, and some
loosely, rammed.
When the molten metal is poured into the mould the loosely
rammed portions yield allowing the casting to alter its proper shape or strain. This
necessitates the subsequent removal of the superfluous metal at a loss of time,
labour and material.
The object of my invention is to ram moulds for casting, by means of a portable
rammer, operated by steam or compressed air, and suitably suspended over the
moulding pit and directed by hand, as I shall describe referring to the
accompanying drawings.
Fig. 1 is a vertical section of a portable rammer according to my invention.
Fig. 2 is a side elevation of the trip which governs the valve.
Fig. 3 is a side elevation of the rammer.
In Fig. 1 A, A¹ are inverted cylinders arranged the one above the other; the
piston rod B is attached to both pistons C, C¹. D D' are exhaust ports in the sides
of the cylinders A, A¹. T, T¹ are slots in the sides of the pistons C, C¹. F is a
pipe communicating with both cylinders A, A¹. G is an ordinary three-way Corliss
valve interposed between the pipe F and a pipe J to which is coupled at Ua
flexible pipe V for supplying steam or compressed air.
The trip I, Fig. 2, attached to the piston rod B engages the
valve G and thereby operates automatically the three-way valve G.
is attached to the lower end of the piston rod B.
lever H of the
The rammer E
S, S are
As shewn in Fig. 3, rods K, K₁, K" connect the cylinders A, A¹.
handles attached to sides of the cylinder A¹. I, is a hanger attached to the upper
end of the cylinder A.
The operation of the portable rammer is as follows:-
Steam or compressed air being supplied through the pipe V, is alternately
admitted by the valve G to the cylinders A and A¹.
When the piston C rises till its slot T coincides with D the steam or air exhausts
through port D, the valve G simultaneously cuts off supply from the cylinder A and
opens it to the cylinder A¹. The piston C¹then descends and the fluid similarly
escapes through the port D¹. The trip I rising and descending with the piston
rod B works the lever H and valve G, admitting steam or air alternately to the
evlinders A and A¹.

page_text: The piston rod B with its rammer E is thus made to ascend and descend with a
stroke uniform in rapidity and force. The rapidity of the blows can be increased
by increasing the pressure of the steam or air.
A workman stands in the moulding pit and directs the blows of the rammer by
means of the handles S S.
The apparatus is flexibly suspended by the hanger I.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. A portable rammer for foundry moulds constructed and operating
substantially as described with reference to the drawings.
2. The combination of an upper cylinder, a lower cylinder attached to it, a piston
rod passing through the bottom of the upper cylinder and through the top and
bottoin of the lower cylinder, and attached to pistons working in the cylinder, a
rammer attached to the lower end of the piston rod, a supply pipe communicating
with the upper and lower cylinders, and provided with a valve worked by a trip
attached to the piston rod so as to supply working fluid from a flexible pipe
alternately to two cylinders, substantially as described.
Dated this 13th day of December 1898.
ABEL & IMRAY,
Agents for the Applicant.