An Improved Automatic Tappet-valve Gear for Direct Acting Pumping Engines.
Year: 1895

page_text: Date of Application, 20th Sept., 1395
Complete Specification Left, 17th June, 1896-Accepted, 29th Aug.,
1896
PROVISIONAL SPECIFICATION.
An Improved Automatic Tappet-valve Gear for Direct Acting
Pumping Engines.
I, STANLEY CLARKE of 90 Lady Pit Lane Beeston Hill Leeds, Yorkshire,
Mechanic, do hereby declare the nature of this invention to be as follows:-
This invention has for its object, an expansion slide-valve in which the cut-off is
effected by means of a spring; leaving the expansion of steam to complete the
stroke, as will be more fully described hereinafter.
I have shewn the mode of construction of my new cut-off and expansion gear
in the accompanying drawing which is explained as follows.-
Steam is admitted at A and passes the slide-valve S, through the port B' into
the end of cylinder C, and acts on the piston F, pushing it, together with the
piston-rod D, and tappet H to the left.
During this movement, the valve S. and valve-spindle G remain stationary until
the tappet H, strikes the washer L' on subsidiary rod M. and carries both together
with the washer L³, and bosses N2 and N¹, to the left, causing the boss N2 to
depress the end U. of catch R which moves about fixed pin V, so that the end X.
is raised from the groove in the collar K and the valve S. and valve spindle G is
moved to the point of cut off by the spring Q.
After the tappet H strikes the washer L' as aforesaid it also strikes the
washer J and carries the valve S. and valve spindle G together with washers J'
& J to the extreme left of the stroke, so that the fixed washer J', comes in
contact with the loose collar K³, contracts the spring Q', and allows the catch Y.
to fall into the groove in the collar K', where it remains until the point of cut-off
in the next stroke is reached.
As the slide-valve S. and spindle G, as aforesaid nears the extreme left of its
stroke, the steam is allowed to exhaust by way of B³ into the exhaust port E, while
the steam from A is admitted, through port B¹ into the left end of cylinder C, and
the motion thereby reversed, the cut-off being worked by the spring Q', collar K',
washer J¹, catch Y, and boss N', similarly as before.
The adjusting of the nuts T¹ T regulates the travel of the springs QQ.
The washers L' and L' are adjusted to the travel of the tappet H, and can be
shifted along the rod M. so as to cut-off the steam at any point of the stroke.
Dated this 10th day of September 1895.
COMPLETE STUITIVATION.
An Improved Automatic Tappet-valve Gear for Direct Acting
Pumping Enginės.
1 STANLEY CLARKE of 18 Trentham Grove off Lady Pit Lane, Beeston Hill,
Leeds, in the County of York, Mechanic, 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:-
This invention has for its object, an expansion slide-valve, in which the cut-off

page_text: is effected by means of springs, leaving the expansion of steam within the cylinder
to complete the stroke, as will be more fully described hereinafter.
I have shewn the mode of construction of my new cut-off and expansion gear, in
the drawing filed with my Provisional Specification which is explained as follows.-
Steam is admitted at A. and passes the slide-valve S. through the port B2 into the
end of cylinder C, and acts on the piston F, pushing it together with the piston-
rod D. and tappett H. to the left.
During this movement the valve, S. and valve-spindle G remain stationary, until
the tappett H strikes the washer L¹ on subsidiary rod M. and carries both,
together with the washers L'N' N' to the left, causing, the washer N to depress
the end U of catch R which moves about fixed pin V. so that the end X is raised
from the groove in the loose collar K, the valve S, and valve-spindle G, are
moved to the point of cut-off by the spring Q, and the expansion of the steam
locked within the cylinder completes the stroke.
After the tappett H strikes the washer L', as aforesaid, it also strikes the
washer J, and carries the valve S. and valve-spindle G, together with the
washers JJ, to the extreme left of the stroke, so that the fixed washer J' comes
in contact with the loose collar K', contracts the spring Q¹ and allows the catch Y
to fall into the groove in the collar K', where it remains until the point of cut-off
in the next stroke is reached.
As the valve S. and valve-spindle G as aforesaid nears the extreme left of the
stroke, the steam is allowed to exhaust by way of B2 into the exhaust port E. while'
steam from A is admitted through port B¹ into the left end of cylinder C. and the
motion thereby reversed, the cut-off being worked by the spring Q¹ collar K¹,
washer J, catch Y and washers N' L' similarly as before.
The adjusting of the nuts T¹ T2 regulates the travel of the springs Q' Q².
The washers L' L' are adjusted to the travel of the tappett H, and can be
shifted along the rod M. so as to cut-off the steam at any point of the stroke.
The catches Y. R. are provided with springs to keep them down in the grooves
of collars K' K'.
Fig. 1 on the drawing filed with the Complete Specification shews the half end
elevation, and half section through S. E. C. and
Fig. 2 shows elevation at G looking towards end shewn in Fig. 1.
In Figures 1 and 2 as aforesaid, steam enters at the pipe A. C is the cylinder.
E the exhaust port, G the valve spindle, and M the subsidiary rod. In Fig. 1 S is
the slide-valve, and H the tappett. In Fig. 2, L' is the washer on subsidiary rod,
D the piston rod, Y the catch, and J' is the fixed washer on valve-spindle G.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is.
(1.) In direct acting pumping engines, springs closing the slide-valve, at the
point of cut-off in each stroke, substantially as and for the purpose herein before
described.
(2.) An adjustable check for limiting the travel of the springs, substantially as
and for the purpose herein before, described.
(3.) This valve gear can be adjusted so as to cut off at any point of the stroke
as required, substantially as and for the purpose herein before described.
(4.) In vertical engines this valve-gear allows the up and down strokes to have
different points of cut-off, substantially as and for the purpose hereinbefore
described.
Dated this 16th day of June 1896.
STANLEY CLARKE,