US 992089 A
Description (OCR text may contain errors)
G. H. WATT.
APPLICATION FILED DBO. 27, 1900.
wi/bnmao UNITED STATES PATENT OFFICE.
GEORGE H. WATT, 013 DETROIT, MICHIGAN, ASSIGNOR, WESLEY A. PHILLIPS, 013 DETROIT,
BY MESNE ASSIGNMENTS, TO lflICI-IIGAN.
This invention relates to a valve mecha-,
.nism for engines of the internal combustion typev and more particularly to an arrange- -n1ent. thereof for allowing reversal of the engine. he; Invention consists in the ,matters hereinafter set forth, and more particularly pointed out in the appended claims.
In the drawings, Figure 1 is a view in side elevation of a portion of an engine together with the valve mechanism that embodies features of the invention; a portion of the valve mechanism being shown in section; and F ig.
2 is a view in detail of a cam.
Referring to the drawings, an engine cyl- I inder 1 has an inlet valve whose stem 2 extends through the cylinder head and is held;
projected with the valve in closed position by a suitable spring 3 in compression between the cylinder head and a stop 4 on the stem. An outwardly closing exhaust valve in the cylinder head has a stem 5 that is held with the valve seated or closed by a spring 6 that encircles the stem and is in c0mpression between the cylinder head and a suitable collar or stop 7 on the outer end of the stem. r v I The exhaust valve is operated by a lever 8 of the first class whichlhis fulcrumed on a standard' 9 on the head, and has a foot piece 27 pivotally connected at one end thereto and adapted to bear against the end of the exhaust valve stem 5. The other end of the lever is pivoted to the upper end of a push rod or tappet 10 whose lower portion 11 is squared, polygonal r otherwise arranged to have non-rotatable and longitudinally reciprocable movement in a hollow guide 12 secured to the motor. A friction roll 13 in the extremity of,the rod bears against a camvlet on a cam shaft 15 which is driven in proper timed relation to the engine by any suitable means. The tappet rod may be lengthened or shortened by means of a collar 16 on the lower end of the portion 10 that telescopes with the upper portion of Specification of Letters Patent. Application filed December 27, 1909.
Patented May 9, 1911.- Serial No. 534,929.
desired position andflits inner end bears against the upper face of the inlet valve stem 2.-
The cam 15 .has one lifting-point 22 followed by a depression 23 which'ji's-arranged to operate the parts for forward-motion of a the engine.- A neutral cylindrical face 24 separate's'the forward cam point "from a.
second shoulder 25 adapted to o crate the valves for turnin' the engine int e reverse direction. The I sponding depression is longitudinally shiftable in its bearing or the cam may be moved on the shaft;
In operation the raisingof the tappet rodv by either of the lifting -points depresses. and
valve positive] v The fiirce opens the exhaust spring 19 is of sufiieient tension to the cam roll on the tappet into he depression following the point against the action of the spring 3 so that the inlet valve is opened.
By this arrangement of parts a single oscillatory tappet rod and cam o crates both the inlet and exhaust valves an reversal is obtained by shifting the double compound cam beneath the tappet. This avoids multiplicity of tappet rods and is a simple and. easily adjusted mechanisnr for insuring proppr action of the valves.
O viously, changes in details of construction may be made without departing from the spirit of the invention and I do not care to limit myself to any particular form or arrangement of parts. I
What I claim as my invention is 1. In an explosive engine, an inlet valve for the cylinder thereof having an outwardly closing spring-seated closure, an exhaust valve for the cylinder having an outwardl closing, spring-seated closure, stems extend ing from each closure, a lever pivoted on the cylinder one end of which is adapted to engage the stem of the exhaust valve closure and unseat the latter when the lever end is depressed, a longitudinally. reciprocable tapatter, point has a con-e 26.. ,Thecam shaft 15-.
pet pivoted at one end to the other end of the lever, a cam and a spring coacting therewith to reciprocate the tappet, and an arm. adjustably secured on the tappet for de-' pressing the stem of the inlet closure and unseating the latter at each stroke of the pp 1 2. In an explosive engine, an inlet valve for the cylinder thereof having an outwardly closing, spring-seated valve closure, an-ex haust valve for the cylinderhaving an outwardly closing, spring-seated closure, stems extending from each closure, a lever pivoted on the cylinder one end of which is adapted to engage the stern of the exhaust valve closure and'unse'at the latter when the lever end isdepressed', a longitudinally reciprocable tappet connected at one end to the other end of the lever, a'cam and a spring coacting therewith to reciprocate the tapp'et, and an arm adjustably securedon the tappet for depressing the ste n'of the'inlet closure and unseating thelatter at each sti tike of'the tappet, the earn being 'longitiidinally shiftableto bring either forward or reverse points into operative relation with the t-appet for changing direction of motion of the motor.
n an explosive engine, an, inlet valve for the cylinder thereof having an outwardly valvenfor the cylinder having an outwardly closingspring-seated closure,- stems extendin from each closure, a lever pivoted on the 'cy inder, a foot piece pivoted to one end of the leverbf the ex aust valve'closure and unseat the letter when the lever end is depressed, a longitudinally' reciprocable tappet pivoted at one end to and ars'pring coacting therewith tor'eciprowitnesses.
in presence of two 1 i G BGEE e -T-M;
Witnesses Orro F. BARTHEL,
LEWIS E FIJANDERS.
Copies of this patent may beQo'bt ained for five cents each; by addressing the Commissioner of Patents, I I Washington, DQG. 5 I I closing spring-seated "closure, an exhaust that is adapted to abut. thestem the other-end of the lever, acam cate the tapp'et, and an arm adjustably se- In testimony whereof I athx'niy signature