US717990A - Valve-seat for explosive-engines. - Google Patents

Description

No. 717,990. PATENTED JAN. 6, 1903. W. M. HARVEY. VALVE SEAT FOR EXPLOSIVE ENGINES.I APPLICATION FILED AUG. 1s. 1902.

No MODEL.

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VVINFRED Mi. HARVEY, OF lDENVERCOLORADO.

'VALyE-SEAT FoR ExPLoslvE-i-:NGIN Es.

SPECIFICATION forming partnof Letters Patent No. 717,990, datedl'anuary 6, 1903.

Y Application filedAugust 18, 1902. Serial No. 120,005. v(Ilorniodel.)

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Be it known that. I, WINERED M. HARVEY, a citizen of the United States of America, residing at Denver, in'the county of 'Arapahoe and State of Colorado,ha`ve invented .certain self-adjusting, in which the wear of its packing is automatically takenup, is simple in its construction, and mayreadily be repacked.`

To this end it consists'of an annular groove for'the reception of a composite packing, the side walls of said groove ,being formed by two adjustable rings fitted-over the mouth of the valve.

The invention will now be described in de` tail, reference being made to the accompanying drawings, in which- J Figure l is a vertical central section of `a valve arranged according to my invention and provided with a spring-pressed valveplate. Fig. 2 is a similar view of a valve with the valve-plate arranged to be operated by a.

plunger. (Not shown.) Fig. 3 is a detail view, partially broken away, showing the construction of valve-seat. Fig. 4 is a top plan View of the wearing-surface of valve-seat.

Referring to the drawings, like reference characters refer to like parts throughout the several views, in which- 5 is the body of the valve, having the central passage 5fL and side passage 5c leading into it at right angles to the passage 5a. The mouth of the passage 5a is provided with the annular projection 5, and upon this annular projection is mounted my improved valveseat, which consists of the two hard-metal rings or collars 6 and 7, which are closely fitted over the outer and inner walls, respectively, of the annular projection dand extend above said projection, so as to form an annular groove 8 for the reception of a composite packi ing 8, withwhich said groove 8- is filled.

"lhese rings or collars 6 and 7 present a thin 'made thick, so as to resist the action of the eX- treme heat common to valves of this class. To insure and retain a close fit of the collars 6 and 7, their lower or thickened portions are provided with open slots or cuts 6c and 7c. Fitted over the valve-seat is the valve-plate Q which consists of a steel disk loosely pivoted to a stem l0. The stem l0 passes through the valve and has a spiral spring 1l surrounding its protruding end. A This spring l1 serves to hold the valve normally-in its closed position, as shown in Fig. 2. In Fig. l the valve is shown applied to a supply-port in which the valve is opened and the gas is drawn up through the passage 5L and.5c by the suction created in the cylinder, while in Fig. 2 it is shown as applied to the exhaust-port, in

which a"plunger (not shown) intermittently engages the stem 10, raising the disk 9 and permitting the exhaust-gas to escape down Ythroughlthe passages 5a and 5c..

In operation it will be seen that the looselypivoted valve-plate 9, resting over the annular exposed surfaces of the packing in the Vgroove chamber or channel 8, will automaticalI'yadj-ust itself to a closely-sealed fit when `the valve is closed, and as the packing wears away the impulse of the plate 9 on the edges over the annular projection 5d in proportion to the wear of the packing, in this manner preserving a smooth packed face to the seat of the valve until all of the packing in the groove 8 has been consumed or worn away, when the valve-seat may be repacked by raising the collars G and 7 and refilling the groove thus formed with a new supply of packing.

It has been found in practice that the composite packing arranged in the face of the valve seat, as above described, will sufficiently absorb the moist burned gases common to motors of this class, leaving a free and dry surface to the valve-plate 9.

Having thus described my invention, what seat comprising a projection surrounding the of the collars 6 and 7 will force said collars IOO passage to be controlled, two rings applied to the opposite surfaces of the projection andv Valve, to compensate for the Wear of the packj ing, substantially as described.

2. A valve-seat comprising a projection surrounding the passage to be controlled, two rings adjustably applied to the opposite surfaces of the said projection and normally extending beyond the projection to form a groove or channel for the purpose set forth.

3. A valve-seat comprising a projection surrounding the passage to be controlled, two rings applied to the opposite surfaces of the said projection and normally extending beyond the same to form a groove or channel, and a packing placed therein, the said rings being constructed to lit the projection tightly but adapted to move in response to valvepressure as the packing wears away, substantially as described.

4. The combination with a valve and stem, the valve being pivotally connected With the stem, and a projection surrounding the passage to be controlled by the Valve, of two rings applied to the opposite surfaces of the said projection and slotted to permit adjustment while fitting the projection tightly, the said rings normally extending beyond the projection to form a packing-chamber, and a suitable packing placed in said chamber, the arrangement being such that the rings are automatically adjustable in response to the Valve-pressure as the packing Wears away, substantially as described.

5. The combination withavalve and a part surrounding the passage to be controlled, of two rings applied to the opposite surfaces of the said part, the said rings being reduced in thickness to form a valve-seat, their thicker portions being slotted to cause them to t the said part tightly, and at the same time permit adjustment, the reduced portion of the rings projecting beyond the said part and forming a packing groove or chamber, sub4 stantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

WINFRED M. HARVEY.

Witnesses:

DENA NELsoN, A. J. OBRIEN.

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