Improvements in and Connected with the Fastening of Cylinder A Covers in Four-stroke Gas, Petroleum and like Motors.
Year: 1898

page_text: Date of Application, 9th Nov., 1898-Accepted, 4th Mar., 1899
Improvements in and Connected with the Fastening of Cylinder
A
Covers in Four-stroke Gas, Petroleum and like Motors.
communication by THE GESELLSCHAFT FÜR AUTOMOBILWAGENBAU,
GESELLSCHAFT MIT CESCHRÄNKTER HAFTUNG, of Nuremburg, in the Empire of
Germany, Manufacturers.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester,
both in the County of Lancaster, 118, New Street, Birmingham, in the County of
Warwick, and 322, High Holborn, in the County of Middlesex, Civil 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:-
-
Four-stroke motors operated by gas, petroleum, benzine and the like which
work without cooling develop as a rule within the cylinder during the period of
working such high temperatures under pressure that the walls of the cylinder are
thereby very strongly affected. In addition, the whole pressure acting upon the
cylinder cover is transferred to the screws which connect the cover with the work-
ing cylinder.
This invention has for its object to considerably relieve the working cylinder
by avoiding the attaching of the cylinder cover to the cylinder walls. For this
object screw bolts are pivotally attached to the cylinder cover and extended or
prolonged to the other side in such a way that they may be attached to the machine
casing by means of screw nuts. The pressure exerted on the cylinder cover is
consequently no longer conveyed to the working cylinder but to the machine.
Simultaneously this improved method of fastening the cylinder cover affords the
great advantage of being considerably easier and more quickly removed than was
before the case. As on the one hand the screws on the machine casing are more
easily accessible than on the cylinder walls and on the other hand the pivotal
suspension of the screw bolts affords the possibility, on only a portion of the screws
being unfastened, of already removing the cylinder cover. For instance, in the
case of four screws arranged opposite one another only two need be released or
unfastened and then the cover may be turned back or lifted upwards by the other
two screws opposite. By prolonging two such screw bolts over or beyond the
hinges the possibility is afforded of introducing a cross piece between them by
means of which the air valve mounted in the cylinder cover may be pressed on
its seat.
In the accompanying drawings,
Figure 1 is a front view, and
Figure 2 a side view of a stationary motor showing one form of construction of
this improved arrangement as follows:-
Four bolts 3 are pivotally mounted or hinged at 2 on the periphery of the cover

page_text: lower ends of the said bolts and above each ring, in each case, a screw nut 5 or the
like is mounted loosely revoluble on the bolt 3.
The lower part 6 of the nut 5 which is provided with a screw thread is screwed
on the upper end of a bolt 8, the lower end of which latter is firmly attached to
the machine casing 9. When the screw nuts 5 are strongly tightened, the cylinder
cover 1 is firmly pressed on the end of the working cylinder 10 and the pressure
exerted by the gases on the cylinder cover 1 is transferred to the machine casing 9
by means of the bolts 3.
All the nuts 5 are easily accessible as may be seen from the drawings so that the
screwing on or off of the cylinder cover affords no difficulty. Moreover particularly
in the form of construction shown in the drawings, in which the cylinder cover is
fastened with four screws, it is only necessary to loosen the two nuts 5, lying at
the left hand side of Figure 2, whereupon the cover 1 may be folded back in an
upward direction by being turned on the two hinges 2, lying at the right hand side
without necessarily releasing the nuts 5 lying on the right hand side.
The two bolts 3 lying on the right hand side, Figure 2, are, as may be seen
in Figure 1, prolonged above beyond the hinges 2, and carry at their upper ends
a cross piece 11. The latter affords convenient means for guiding the spindle 13
of the air valve which is arranged in a valve casing 12 on the cylinder cover,
and is pressed on to its seat, in the ordinary manner by a spring located in said
valve casing.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is:-
1. A method of attaching the cylinder cover in four-stroke motors, characterised
by fastening bolts (3) being pivotally mounted or hinged at equal distances apart
on the periphery of the cylinder cover (1) and screwed to the machine casing (9)
by their other ends by means of screw nuts (5 and 6) or the like, so that the pressure
exerted by the gases on the cylinder cover (1) is conveyed by the bolt (3) to the
machine casing (9), substantially as hereinbefore set forth.
2. A form of construction of the hereinbefore described method of fastening a
cylinder cover characterised by two of the fastening bolts (3) being prolonged
beyond the hinges (2, Figure 1) and receiving on their upper ends a cross piece (11)
which forms a guide for the spindle (13) of an air valve (12) mounted in the
cylinder cover, substantially as described.
Dated this 8th day of November 1898