US1209028A - Steam-cylinder. - Google Patents

Description

A. N. QUlCKST-AD. STEAM CYLINDER.

APPLICATION FILED MAR. 31. 1916.

1,209,028. Patented Dec. 19,1916.

' 2 $HEETS SHEET arvue-vfl 01; W, M Quick sfaa/ l I v v lmm A. N. QUICKSTAD. STEAM CYLINDER.

APPLICATION 111120 MAR. 31, 1916.

1,209,028. v Patented Dec. 19,1916.

2 SHEETS-SHEET 2- v I 31401211101, WI #7856 as fl/M QJl/C/(" m0 W mibw I V W 61110: new

carton.

AUGUST N. QUICKSTAD, OF TORONTO, SOUTH DAKOTA.

STEAM-CYLINDER.

To all whom it may concern: Be it known that I, Anc'nsr N. QUICK- sran, a. citizen of the United States, residing I the invention, such as will enable others skilled in the art to which it appertains to make and use the same. n

This invention relates generally to steam cylinders, and particularly to that type of 'cylinder wherein a sliding sleeve incloses the piston to control the flow of steam pressure to'and from the interior thereof.

My invention has for its object to construct a steam cylinder of the sliding valve type in which the valve or sleeve is properly balanced by the steam pressure, and is, likewise, thrown into its steam admitting positions at opposite ends of the cylinder by the compression of the steam. In furtherance of the above object, it is also intended to eliminate to the greatest possible extent the friction between the cylinder and the=valve sleeve. In those sliding sleeve valve cylinders which are known to me, the frictional element enters as one of the greatest disadvantages to the successful operation of this type of engine, and by my present construction I have sought to eliminate the objectionable feature.

Another object of the invention rests in the disposition of the inlet and exhaust passages, and their relation to the sleeve valve, in that the live steam is introduced to the cylinder from steam chambers which surround the ends of the cylinder and consequently the ends of the sleeve valve and the exhaust steam is kept away from those parts of the assembled structure which should be maintained at a high temperature and are passed out of the cylinder where the temperature can normally be relatively low.

With these objects in view, together with others which will appear as the description proceeds, the invention resides in the novel combination and arrangement of parts, all

as will be described more fully hereinafter, illustrated in the drawings and particularly pointed out in the claims. I

The invention will be best understood by reference to the accompanying "drawings, wherein: f

Figure 1, is a longitudinal sectional vlew Speciflcation'of Letters Patent. Patented Dec, 19, 19116, Application filed March 31, 1916. Serial No. eaoes.

taken through a cylinder embodying my invention, Fig. 2, 1s a similar view taken on line 2 2 of Fig. 3 showing the parts in slightly changed position, Fig. 3, is a sectional view taken on line 3-3 of Fig. 1, Fig. 4, is a similar view taken on line 44 of Fig. 1, Fig. 5, is a sectional view taken on line 5'5 of Fig. 1, and Fig. 6, is a sectional view taken through one end of the cylinder with the sliding sleeve removed.

Referring now more particularly to the drawings, 5 indicates a cylinder casing, the

same being provided as at 6 and 7' with in take and exhaust openings, respectively, the

mediate the ends of the said cylinder, and being disposed inthe surface'of the cylinder at right angles to each other." Ducts 8 communicate at their opposite ends respectively withthe intake opening 6 and-annular channels 9 formed to extend entirely around the cylinder casing at the end thereof'and to communicate with the interior of the said cylinder. These channels 9areof compara "tively small area at the top of the cylinder,

to relieve the I gagement with the cylinder. The ends of the cylinder are closed by suitable head'sflO, the latter being'held securely in proper posi- '7( said openings being located preferably 'interthat the steam rovides a cushion therebelow iding valve of frictional-"en tion by means of screw bolts 11, and each head is provided upon its interior surface with a cut away channel portion 12 forming an annular pocket. One or the heads may be provided with a suitable packing gland 13 through whicha piston rod-14 mayextend.

' A sliding sleeve 15 is arranged within 'the' cylinder casing-5, the said sleeve being ar-.

ranged to reciprocate within the casing and to have its-en s alternately project into the pockets 12 at the cylinder ends, it being 1 11i: derstood that the sleeve is of such length that when one end is projected into j the pocket at one end of said cylinder, the'opposite end of the sleeve will be-withdrawn from its adjacent'pocket to permitof steam flowing from the adjacent annular channel 9 through the pocket 12 and to the mterior of the sleeve 15. The sleeve 15 1s provided intermediate its endsiwitha circular series of spaced exhaust'openings 16, the said openings communicating with the exhaust channel 17 in the interior of the casing 5, the said channel communicating with the exhaust opening 7. The sleeve is further provided throughout a portion of its periphery inwardly from each end with spaced exhaust ports 18, the said ports being substantially narrow, and being adapted when said sleeve is in certain positions to register with exhaust ports 19 formed in the cylinder casing adjacent the ends thereof and communicating with the port 7.

A piston 20 is mounted for reciprocation within the sleeve 15, and is preferably of a length equal to the distance between the lateral edges of the exhaust openings 16 and apoint slightly inward from the adjacent end of the sleeve, so that when the said piston is moved to its extreme limit at one and of the cylinder the said ports 16 will be uncovered thereby, and the innermost end of the piston will be alined with the adjacent edge of the restricted portion of the channel 9. It will be understood, that the same relative positions will be maintained when -the piston 20 is moved to the opposite extreme limit of its movement. Packing rings 21 may be employed to prevent the escape of steam therefrom behind the sliding piston. The piston will be connected as will be readily understood to the rod 14, whereby movements of the same will be imparted-to the said rod. A bracket 22 'is secured in any preferred manner to thesliding sleeve and preferably at such point thereon as to move within the relatively large exhaust opening 7. A

timing rod 23 is secured to the bracket 22- 0 and extends beyond the cylinder casing through a packing gland 24 to any suitable position where it may be connected to the Valve gear for timing the valve.

The constructiomand arrangement is such that when the piston is at the extreme limit of movement in one direction the ports 16 will be uncovered 'to exhaust the steam behind the piston member, while the opposite end of the piston is spaced slightly in- Ward from the adjacent head 10. The sleeve 15 is in such position as to permit of the entrance of pressure from the opening 6 to the annular channel 9 at the rear end of the piston, while the opposite end of the sleeve 15 i5 closes the channel 9 at the opposite end of the cylinder casing. It will thus be seenthat steam will flow from the duct 8 through the channel 9,through the pocket 12 to the inte-' nor of the sleeve 15 and behind the rear end of the iston. The increased pressure at this point orces the piston 20 through the sleeve 15, closing the ports 16 and compressing the dead steam in advance of the piston. This (lead steam is exhausted through the ports 18, 19, until the said piston travels so far as uniform of temperature at all times.

to cover the ports 18, whereupon further outward movement of the piston compresses the dead steam behind the same and forces the same into the adjacent annular pocket 12. This increased pressure engages behind the abutment formed at the extreme end of the sleeve 15 and forces the latter outwardly of the pocket 12. This movement of the sleeve acts to cut off the inflow of live steam at the opposite end of the cylinder and also 7-5 opens communication between the annular channel 9 at the outer end of the cylinder and the interior of the sleeve 15. It will also be observed that the sliding movement of the sleeve 15 severs the communication at the outer end of the sleeve between the ports 18 and 19. The piston 20 is then driven in reverse direction within the sleeve to repeat the above described action or operation.

Ducts 25 may be arranged in the cylinder casing to communicate with the outer annular surface of the sleeve 15 to permit of the introduction of lubricant to the said sleeve to reduce friction. By enlarging the channels 9 at the lowermost portions of the cylinder it will be apparent that the steam. pressure which is atall times present in the said channels will support the sleeve 15 to reduce friction between the latter and the cylinder casing, the larger cross sectional area of the ports at the lower portion of the cylinder permitting the steam at those points toform a cushion for the sleeve valve, the steam pressure also tending to lift the sleeve. It is also obvious that the presence of live steam in the said annular channels maintains the temperature of the sleeve and cylinder walls at the said points at a relatively high degree of heat. The exhaust or dead steam is discharged from the sleeve 15 .inwardly from the ends thereof, and the arrangement of exhaust ports andchannels forms a jacket around the sleeve valve intermediate the ends of the cylinder which is While I have herein shown and described a particular or preferred embodiment of my invenggn, I wish it to be understood that I nee mot necessarily confine myself to all the precise details of construction herein set forth by way of illustration as modification and variation may be madewithout departing from the spirit of the invention or exceeding the scope of the claims.

I claim:

1. The combination with a steam engine cylinder, of heads closing the ends'of the cylinders and having annular pockets, a sleeve mounted for sllding movement within said cylinder and adapted to have its ends .1 project alternately into said pockets, a steam chamber, ports connecting said steam chamber to the interior of the cylinder and to said annular pockets, said ports being adapted to be cut oil by said'sleeve, a piston 13W operated in said sleeve, and exhaust ports through said sleeve to permit the escape of exhaust steam into the cylinder, said piston being adapted to compress steam in said pocketsbehind the ends of said sleeve to alternately open the ports between the steam hamber and the cylinder by throwing the sleeve in the direction opposite to the movement of the piston.

2. The combination with a steam engine cylinder, of heads closing the ends of the cylinders and having annular pockets, a sleeve mounted for sliding movement within said cylinder and adapted to have its ends project alternately into said pockets, a steam chamber, ports connecting said steam chamber to the ends of the cylinder, and to said annular pockets, said ports being adapted to be cut oil by said sleeve, a piston operated in said sleeve, main exhaust ports connecting said sleeve and the cylinder, and auxiliary ports adjacent opposite ends of the sleeve to permit a secondary exhaust of the steam when, the main ports are closed, said piston being adapted to compress steam in said pockets behind the ends of said sleeve when the auxiliary ports are closed to slide the sleeve in the opposite direction, whereby to open the inlet ports.

3. In a device of the class described, a cylinder, heads inclosing the ends of said cylinder and having annular pocket's, a sleeve mounted for sliding movement within said cylinder and adapted to have its ends project alternately into said pockets with the opposite end out of its adjacent pocket, the said cylinder being provided with channels at its opposite ends adapted to beopened and closed alternately by said sleeve to admit or check the flow of steam to said pockets, the said channel being enlarged at the lowermost part of said cylinder, the said cylinder and sleeve being provided inwardly from their ends with exhaust ports adapted to open and close upon movements of said sleeve, a bracket secured to said sleeve, a rod secured to said bracket, and a piston in said sleeve, substantially as described.

.In testimony whereof, I aflix my signature, in the presence of two witnesses.

AUGUST N. QUICKSTAD. Witnesses:

L. A. Finns,

Jun. F. FRIES.

Images