Year: 1893

page_text: With
the same rod D, the two sets of lazy tongs are pinned together at C³, where the
rod is jointed to them. To give the lazy tongs stiffness to prevent springing or
buckling they are also preferably pinned together at each joint as shown.
the organization described the relative extent of motion of the valves and their
operating rod may be in the ratio of say 2 to 1. I can thus with a comparatively
short movement of the rod obtain a relatively great and quick movement of the
valves.
To ensure the firm closing of the valves against their seats, I provide the
following toggle organization. Each valve has pivoted to it one or more short
links G (two being shown) and the ends of each pair of opposite links on the two
valves are respectively jointed to a rod H working in a guide bracket H¹ on one
of the valve disks B', and adapted to abut when the valves are closing against an
adjustable stop I carried by a plug 11 secured in the bottom of the casing. It
may be secured by heing leaded in a suitable socket as shown, a representing the
lead. Each stop consists of a rod 1 squared near its upper end and having on its
lower end a screw thread that works in a socket in the plug 11. By applying a
key or wrench to the squared end of the rod it may be turned up or down. It
should be so related to the red H that when the valves are in position for closing
said rods abuts against the stop rod and the toggles force the valves firmly against
their seats.
Of course the effect and structure would be mechanically and practically the
same if as indicated in Figure 4 the ends of the lazy tongs levers that are con-
nected with the valve were pivoted by means of the short links C on fixed pivots
in the hood, and the pivot C² located on the valve, the rod D being connected with
the first central joint as at present. This joint would in the event of this inversion
of the parts be the one marked Y.
The valves B have lugs thereon that run in guides on the casing. These
guides are preferably made by casting the face of the casing sections plain and
then securing thereto strips 62 to form the guide ways.
This is the structure shown,
13 being screws that attach the guide strips to the casing.
Of course the connection of the upper end of the lazy-tongs with the casing may
'be made in the same manner that the lower end is connected with the valve in
Figure 1, the lower end being still connected with the valve in the same manner or
the connection with the valve and with casing may be made by bringing the end
levers together at each end and mounting them upon a common pivot. The primary
characteristic of the invention consists in the fact that the upper end of the lazy-
tongs is so connected as to be held substantially against endwise movement, and
that the valve-operating rod is connected with the lazy-tongs between its end, at a
point between the fixed end i.e. that end attached to the casing and its free end
attached to the movable valve.
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 :-
1. The combination, substantially as set forth, of the valve, the lazy-tongs cor-
nected at one end with the valve and to a fixed pivot at the other end, or vice versa,
and a valve-operating red or device connected with the lazy-tongs between the
fixed end and valve.
2. The combination, substantially as set forth, with the valve and its casing of
the lazy-tongs connected at one end to the valve and at the other with the casing,
or a fixed part of the apparatus, and a valve operating rod or device connected with
the lazy-tongs, between said two points of connection for the purpose described.
3. The combination, substantially as set forth, of the two valves, two lazy tongs
each connected at one end with one of the valves, and their opposite ends connected
to a fixed pivot, and a valve operating device connected with both sets of lazy.
tongs at a point between the valves and the fixed pivot.
4. The combination, substantially as set forth, of the two valves, the two lazy

page_text: tongs pinned together at their joints and each connected at one end to one of
the valves and at their opposite ends to a fixed pivot or vice versa, and a valve
operating device connected to both lazy tongs at a point between the fixed end
and the valves.
5. The combination, substantially as set forth, of the two valves, two lazy
tongs each connected at one end with one of the valves, and their opposite ends
connected to a fixed pivot, a valve operating device connected with both sets of
lazy tongs at a point between the valves and the fixed pivot, and the toggle-valve-
closing-devices located between the two valves.
6. The combination, substantially as set forth, of the two valves, means for
opening and closing them, toggle levers pivoted to the adjacent faces of the
valves, a rod connected with said levers, and a stop against which it works.
7. The combination, substantially as set forth, of the two valves, means for
opening and closing them, toggle-levers pivoted to the adjacent faces of the
valves, a rod connected with said levers, and an adjustable stop against which it
works.
8. The combination, substantially as set forth, of the valve, the lazy tongs.
connected at one end with the valve and at the other end with a fixed pivot, the
screw threaded valve operating rod connected with the lazy tongs between the
valve and the fixed pivot, the threaded nut engaging the rod, means for operating
the nut to move the rod endwise, and locking devices for holding the rod in the
desired position.
9. The combination, substantially as set forth, of the valves, means for opening
and closing them, the toggle-levers pivoted in the adjacent faces of the valves, the
rod pivotally connected with the ends of the toggle-levers, and the adjustable
screw-threaded stop rod against which the toggle rod abuts to firmly close the
valves.
10. The combination, substantially as set forth, of the casing having guide
strips 62 secured thereto, the valve having lugs that run in the guides, the lazy
tongs, and the valve operating rod or device.
Dated this 28th day of December 1892.
CHARLES LEONARD ROWLAND.