US33123A - Agtiokr-qbi springs-esp govebnoes - Google Patents

Description

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MFFERS. PKOTO-LITHOGRAFKER. WASHINGTON. D. C.

11W. EVANS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HIMSELE ANDO. O. .'IhlNgIQfN,S,`

OF SAME PLACE,`

EQUALIZNG THE AGTIONWGF SPRINGS-IN1 GOVERNGBIS.

Specification of Letters-Eatent No.` 33,123; dated August-20,1861.

To all whom it may concern:

Be it known that LTIAMPTON lV. EVANS, of Philadelphia, Pennsylvania, have invented a new and improved Mode of Equalizing the Action of Springs in Governors; and l do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings and to the letters of reference marked thereon.

My invention consists in combining a spring with a governor spindle and rods so arranged as to form a knee joint substantially in the manner described hereafter so that the force applied to overcome the rigidity of the spring may be transmitted through a leverage constantly increasing as the resistance of the spring increases thereby eqiralizing the action of the said spring, a desirable object to be obtained under certain circumstances described hereafter.

In order to enable others to make and use my invention I will now proceed to describe the manner in which it may be constructed and applied.

On reference to the accompanying draw- Figures l and 2 illustrate my invention as applied to a governor for steam engines; Fig. 3 a sectional view of parts of Figs. l and 2.

On reference to Figs. l, 2 and 3, A represents the spindle of the governor and B and B the weighted arms hung tothe top of the spindle in the usual manner. To the weights n ct of the arms B and B are jointed the upper ends of the rods C and C the lower ends of the latter being connected to the sleeve D which is fitted snugly to, but arranged to slide freely on the spindle A.

E is a spring connected at a point midway between its opposite ends to the spindle A by means of nuts t and c, which are adapted to the screwed portion of the said spindle.

To one end of the spring' is jointed a rod F and to the opposite end a similar rod F, each rod being connected to a coupling Gr by means of a nut Z one of these couplings being connected to a lug on one side and the other to a` lug on the opposite side of the upper end of the sleeve D. The lower end of the latter has a recess [L for receiving the end oi the usual governor lever through which the movement of the sleeve is communicated to the throttle valve of the steam mg which forms a part of this specification` On reference to F ig. l the sleeve D is l illustrated as depressed to the limit of its downward movement as regulated by this nut. As the governor revolves the weighted arms will iiy out and the sleeve will rise to an extent regulated by the speed of the governor and the rigidity of the spring E. Now supposing this spring acted directly on the sleeve without the intervention of the rods F and F', it will be evident that the higher the sleeve rises through the centrifugal 'orce of the weights the greater will be the opposing force presented by the increased rigidity of the spring as the opposite ends of the latter are raised, consequently the governor will be irregular in its movement the irregularity being in proportion to the dilierence in the rigidity of the spring as the ends of the latter are raised. By connecting the spring to the sleeve by means of the rods F and F however the case is diiierent, as they forni with the sleeve and spring the well known knee joint, so that as the sleeve is raised it acts on the spring through 'a constant leverage gradually increasing as the sleeve rises and as the rigidity of the spring increases. Thus in Fig. l where the sleeve is depressed to the limit of its downward movement, the force applied by the revolving balls tending to raise the ends of the spring will `be applied through a leverage equivalent to that represented by the blue lines y and y the former representing the long arm of the lever acted upon by the sleeve and the latter the short arm acting on the spring and the point g being the fulcrum of the lever. As the sleeve rises the long arm of the lever becomes gradually longer and the short arm shorter so that by the time the sleeve has arrived at the position shown 1n F ig. 2, the leverage on the spring will have` been increased to the proportion represented by the blue lines in that figure.

t will be evident without further description that by transmitting the force imparted to the sleeve by the action of the revolving Weights to the spring E through the medium of a knee joint the increasing rigidity of the spring as its opposite ends are raised is counteracted by an increased force applied to raise the said ends and consequently that the action of governor is uniform throughout.

I claim as my invention and desire to secure by Letters Patent- Combining a spring With the governor spindle A and rods F and F so arranged as to form a knee joint substantially as and for the purpose herein set forth. In testimony whereof, I have signed my name to this speciiication7 in the presence of 15,

tvvo subscribing Witnesses.

HAMPTON W. EvANs.l Y

Vitnesses AHENRY HovvsoN,l

CHARLES HoWsoN.

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