Year: 1889

page_text: I, BRUNO VICTOR NORDBERG, residing at Number 121, South Bay Street, in the
city of Milwaukee, in the county of Milwaukee, and State of Wisconsin, in the
United States of America, 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 :—
The invention relates to automatic cut-off gear for steam-engines, and it consists in
certain peculiarities of construction and combination of parts, which are, in part
improvements on the devices set forth in the patent Number 12,030 granted (as a
communication from abroad) to Herbert John Allison. under date of September 6,
1887, all as hereinafter fully set forth, and illustrated in the accompanying drawings.
Description of the drawings.
Fig. 1 is a vertical section of a cut-off gear embodying my invention. Figure 2.
is a side elevation of the same. Figure 3 is an enlarged section of the upper
portion of my gear. Figure 4 is a rear elevation. Figure 5 is a section on line
5-5 of Figure 4, and Figure 6 is a detail of a modification.

page_text: A is the stand that contains the valve and cut-off.
B is the rock-shaft, that, through crank C, is connected to the eccentric-rod of the
engine. This rock-shaft has one bearing in the stand at a, and the other in a sleeve, b,
that is fitted in a housing b'. Just opposite shaft B another shaft, c, is journaled
in the stand, and on shaft B is fixed a carrier, d, while shaft c loosely carries a like
carrier, d¹, and these two carriers are connected at their upper ends by links e e and
bolts ff, which latter form the pivots for triggers g, one of which is interposed between
the upper arms of each carrier.
D are lifting levers, one of which turns loosely on shaft B and the other on.
shaft c, and each lifting lever is interposed between the lower arms of a carrier, d,
and has a notch, d³, in its upper corner to receive the lower end of a trigger, g, while
its lower end projects under the hanger-bar E of the valve stem F. Each of the
triggers g is weighted, as at g', to insure its engagement at the proper time with
its subjacent lifting lever D, as shown in Figure 1. The drop of the lower ends of
the lifting-levers D is limited by scrow-stops J, that project up through flanges ; in the
stand, and the valve-stem is depressed by a spring K, as in patent Number 12,030
dated September 6, 1887, hereinbefore referred to.
L is the governor stem, the lower end of which rests on the upper end of a
sliding rod, M, which in turn terminates in a concaved head, m, having ears n, and a
double tripping-dog, o, is pivoted in head m so that its ends project under ears n
in position to receive adjusting-screws p, by which it is set.
g
The upper end of the stem L has a cap, P, screwed on to it, and this cap has a
bolt, 7, projecting up from its center into a cup R. The bolt is shouldered to form
a seat for the cup R, and is also reduced and screw-threaded to receive a nut, r, that
secures the cup R on the seat formed by so reducing it; but before the cup is
placed on the bolt q a clutch, s, is slipped on said bolt, and this clutch rests on cap P
and has side openings in which the short arms Q, that form part of the governor-
armis Q¹, fit.
T is a cap that is screwed onto the upper end of the sleeve U, that carries the
governor-arms, and this cap is formed with a hollow plug, u, that fits in the cup R.
The screw-threaded boss of a needle, V, is passed down through the hollow in
plunger u, which has side openings, w, that communicate with cup R through the
plunger.
The rod M is slotted at m³ to receive one end of a lever, m³, that is pivoted to the
stand at m³, and the outer end of this lever, which is weighted, is suspended by a
cord, h, from the arm h¹ of a sleeve, h², of the sleeve h³, that forms the bearing of the
driving-shaft of the governor, which shaft is connected by bevel-gearing h³ h¹º
with a sleeve, H, that carries the governor-sleeve U. The sleeve ³ has an arm hº,
in which the stud of a pinion, 77, revolves, and this pinion carries the pulley of the
belt ✗, that connects the governor with the engine, and also meshes with a
pinion,, on shaft h. The operation of this portion of my device does not differ
materially in operation from that in the hereinbefore named patent of September 6,
1887.
While the belt is on and intact it counterbalances the weight h° on sleeve h³, and
the connection between lever m² and arm h³ is slack; but should the belt break
or slip off the pulloy weight he will drop and arm h¹ will lift lever m³ and cause
its inner end to depress the rod M and throw the dog o upon the triggers g and dis-
engage them from the lifting-levers.
It will be seen that the trip-lever carries and the lifting-levers have the same axis,
and there is no lost motion whatever in triggers 9 and lifting-levers when they
are in engagement, and that their action is certain and noiseless.
The cup Ris to be filled with oil and serves as a dash-pot to prevent jar from the
sudden action of the governor.
In the modification shown in figure 6 a hook, 93, is substituted for the weight, the
effect of which is obtained by a spring, g³, one end of which is caught on the hook and
the other on balt I

page_text: 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. The combination, with the valve and its hanger or stem, of two lifting-levers
independent of each other and of the valve-hanger, two triggers or trip-levers, and
carriers therefor oscillating on the same center as the lifting-levers.
2. The combination with the trip-levers and lifting mechanism, of the governor
and its stem and a sliding rod, and a tripping-dog pivoted to the lower portion of the
said rod, and adjusting screws therefor.