USRE909E - Improvement in steam engines - Google Patents

Improvement in steam engines Download PDF

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Publication number
USRE909E
USRE909E US RE909 E USRE909 E US RE909E
Authority
US
United States
Prior art keywords
motion
valve
weight
improvement
arm
Prior art date
Application number
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English (en)
Inventor
E. Sickels
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  • my invention consists in liberatin g a weight, spring, or other forceto move a valve to cut ott', by the aid of an independent motion, in combination with a regulating-reservoir, so as to facilitate a rapid closing of the In cutting ott' when the lifter motion is in astate of rest, and using this motion alone to dis.
  • F is a valve rod or stem, having a piston or plunger attached to its upperv end, operating within a reservoir, A, shaped Asmaller at the bottom, which may coniine the iinid contained therein as the plunger descends, substantially in the same manner described in the patent granted to me May 20, 184?, so as to regulate the vele city ofafalling weight connected t0 the stem, that is suiiicient to overcome all friction in closing the valve.
  • the valve To this rod or stem the valve must be attached.
  • Either single, double, A spring, Z has a catclrpiece, Z, connected toit, that ts into a notch formed by the catch Gr, and extends beyond, which piece Z has a curved projection, S, at the extreme end, against. which the outer face of this arm or wiper Z strikes as it vibrates on its vertical axis.
  • this arm or wiper is parallel with its shaft -or axle, and is of greater length than the motion of the lifter, so that it can act upon the curved projection on the catch-pece Zl axle there is an arm W connected b a rod Y 7 7 y 7 Y, with a similar arm, W, on the upper end of a vertical shaft, Q, which has a spring-arm,
  • a connecting-rod, R extends to one arm of a bellcrank, L, the other arm of which is connected by a eonneeting-rod,'N, with the strap M of the eccentric I, and at right angles to the eccentricrod J, that operates the rockshaft U of the lifters A A, so that the sector P and the parts deriving motion from it are moving while the litters are in a state of rest, and thereforethe liberation of the weight to close the valve can be effected when the lifter-motion alone would be inefficient, and y thus obtain a rapid closing of the valve at this part of the stroke, if a regulating reservoir is used to control the momentum.
  • the shaft 0, which is below, has a spring-arm, S,A similar and corresponding to the one, T, betore described, and at its lower end an arm, B,and connectingrod C', corresponding with the arm W and rod Y above, and all lother corresponding parts to work the cut-off valve for this end of the cylinder are substantially the same as the parts above described for the other end of the cylinder.
  • the sector P has a plate, P', above and parallel with it for the purpose of strength and to act as a guard for the springarms S T.
  • the face of the sector P is provided with two sets of teeth, each eX- f tending from the' middle or arms U U to the ends, and the length of each part of the sector is such that the ⁇ motion of the springarms S T from one extremityto the other of the sector shall shift the position of the cam or wiper Z and the corresponding one below, so that when the spring-arms are at the outer end of the segment the cams or wipers shall vibrate without permitting the weight to move the valve to cut off, and by moving them toward the middle the extent of the cut-off shall be reduced from the maximum to the minimum-that is to say, to cut off from the greatest to the least portion of the stroke.
  • anymotion derived from any part of the engine may be substituted for the motion of the arms or Wipers, provided it has motion as y distinguished from the lifter motion-as, for instance, instead of the horizontal vibratory motion of the arms or Wipers, the time when the Weight may be permitted to act to close the cut-oi valve may be regulated by a vertical descending motion as the lifter rises, and
  • adjustable mechanism may be used for the independent motion; or all may be dispensed with in the use of this invention.
  • Sheet No. 4 shows the elevation of parts before described, (it being understood that the form and arrangementl of them Will depend in each case, as in this, upon the general arrangement of the valvegear,) and to Which attention is particularly required in order to understand this invention.
  • A is the regulatingreservoir.
  • Zll is the catch-piece.
  • F is the valve rod or stem to which ythe weight and valve are attached.

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