US1202915A - Engine. - Google Patents

Description

T. E. STURTEVANT.

ENGINE.

APPLICATION FILED SEPT. 5, 1912.

PiLtGIltCd OCT). 31, 1916.

2 swans-swan 1 ATTORNEY T. E. STURTEVANT.

ENGINE.

APPLICATION FILED SEPT. 5, 1912.

Patented Oct. 31, 1916.

2 SHEETS-SHEET 2- INVE/VMR fi w ATTORNEY WITNESSES a M THOMAS E. STURTEVANT, OF DOVER, NEW JERSEY.

ENGINE.

Specification of Letters Patent.

Patented Uct. 31, 121 6.

Application filed September 5, 1912. Serial No. 718,619.

To all whom it may concern:

Be it known that I, THOMAS E. STURTE- VANT, a citizen of the United States of America, and a resident ofDover, county of Morris, and State of New Jersey, have invented certain new and useful Improvements in Engines, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

ll ly invention relates to direct acting engines which are operated by compressed air, steam, or other motive fluids and are particularly adapted for operating rock drills and other similar apparatus.

The object of my invention is to provide a relatively simple and compact engine of. the character above specified that shall be relatively easy to assemble and inexpensive to manufacture and that shall embody a positively acting valve for controlling the action of the main piston.

Figure 1 of the accompanying drawings is a sectional elevation, in a central longitudinal. plane, of an engine constructed in accordance with my invention. Figs. 2, 3 and at are transverse sectional elevations on the lines 22, 33 and 4c4.- of Fig. 1. Fig. '5 is a sectional plan view on the line 55 of Fig. 1. Fig. 6 is a fragmentary view corresponding to the central section of Fig. 5 with the valve removed. Fig. 7 is an end elevation of the cylinder casting with the cylinder heads removed and Figs. 8 and 9 are detail perspective views of the valve.

Like characters of reference designate corresponding parts in all of the figures.

The device here shown comprises a casting 10 having substantially parallel cylindrical openings 1,1 and 12 extending longitudinally through it, a main piston 13, a cylindrical valve member 1%, a tappet block 15 supporting tappets 16 and 17 and cylinder heads 18 and 19.

The casting 10 is provided with a central slot 20 which is open at the top and is adapted to receive the tappet block 15. It is also provided with ports 21 and 22 which provide communications between the corresponding ends of the cylindrical openings 1.1 and 12, and longitudinal passages 23, and 2st located one on each side of the cylindrical opening 12.

Each of the cylinder heads is provided with a transverse passage 25 and a boss projection 26 which has a tapped hole 27 to receive a pipe connection. The heads are secured to the casting 10 by bolts 30, or by some other suitable means, and when they are in position the transverse passages 25 communicate respectively with the longitudinal passages 23 and 2 The cylindrical valve member 1-1 is composed of an intermediate section 35 which is shown in perspective in Fig. 9 and a pair of interchangeable end sections 36 and 37 one of which is shown in perspective in Fig. 8. The intermediate section fits into a concave cylindri'cally curved surface 37 of the tappet block 20 and is grooved to produce a tipped over Qshaped section as shown in Fig. 2 of the drawings. Each of the end sections 36and 37 is provided with a pair of slots -10 and 41, which serve to establish communication between the main cylinder and the one or the other of the longitudinal passages 23 and 21 as hereinafter more fully pointed out. The slots 10 and .1-1 communicate with each other through transverse openings 43 in the valve section and are so located that the two sections may be interchangeable, both of the grooves being active at one end of the cylinder and only one being active at the opposite end.

The tappet block 15 is provided with inclined slots 45 and 4-6 in which the tappets 16 and 17 are respectively located.

The main piston 13 has the usual rod 50,

and is divided into a pair of similar piston heads 51 and 52, which are connected by a rod or bar 53 of reduced section. The adjacent edges of the piston heads 51 and 52 are beveled and constitute cam surfaces which respectively actuate the tappets 16 and 17 as the piston approaches one or the other of its extreme positions. The ends of the tappets are beveled at their corners to correspond and cooperate with the beveled edges of the piston heads, both ends being correspondingly out in order to make them reversible and interchangeable. 3

As clearly shown in Fig. 2, the ends of the tappets, which are remote from the piston, engage the intermediate section of the cylindrical valve member, the arrangement of parts being such that when one tappet is forced outwardly by engaging one of the piston heads, the valve member is oscillated in one direction, and is oscillated in the opposite direction when the other tappet is actuated by the opposite piston head.

The slot or opening 20 in the casting 10 is closed, when the tappet block 15 and the valve members are in position, by a cap 42 which has a cylindrically curved bottom surface to engage the valve section 35.

The three sections of the cylinder valve member operate together as a unit and may be operatively connected in any suitable manner. As shown in the drawings the intermediate section is provided with key slots 60 and 61 at its respective ends which are engaged by key projections 62 and 63 of the end sections 36 and 87. The valve members may thus be readily disassembled. When the cylindrical valve member is assembled in the cylindrical opening or cylinder 12, the adjacent ends of the passages 21 and are opposite the slots 40 and 41 of the respective end sections of the cylindrical valve member.

Apair of gates or passages 65 and 66 are provided near one end of the casting 10 between the passages 23 and 24 and the cylindrical opening 12 in which the valve member is located. These gates are opposite the slots 40 and 41 of the valve sections 36. Another pair of gates or passages 67 and 68 are provided near the other end of the casting 10 and form communications between the passages 23 and 24 and the cylindrical opening 12 adjacent to the slots 40 and 41 of the valve section 37.

The sectional view of Fig. 3 clearly indicates the position of the passages 65 and 66 and their relation to the slots 40 and 41 in the valve section 86, and the sectional view of Fig. 4 indicates the position of the gates 62 and 63 relative to the slots 40 and 41 in the valve section 37.

The casting is provided with a hollow boss or bracket 7 O by which the engine may be adj ustably supported.

Special attention is directed to the fact that the cylinder heads 18 and 19 are interchangeable end for end, that the tappet block 7 15 is reversible and the tappets are both reversible and interchangeable so as to preclude the possibility of their being improperly assembled in the engine, and that the end sections of the cylindrical valve member are interchangeable. By thus reducing the number of different parts, and so forming them as to make it practically impossible to improperly assemble them, the engine may be manufactured in large quantities at a relatively low cost, and may be taken apart and reassembled by the unskilled mechanics who usually make use of this kind of-a machine.

The operation of the engine is as follows I Assuming that the parts occupy the positions in which they are illustrated and that the passages 23 and 24 are respectively connected to an exhaust chamber or to the atmosphere, and to a source of compressed air,

(not shown) through a pipe 80, the transverse passage 25 of the head 18, the passage 24, the gate 61, the grooves 40 and 41, which are joined by the transverse passage 43, and the passage 22 to one end of the main cylinder 11. Communication is also established from the opposite end of the cylinder 11 through the passage 21, the groove 41, the gate 62, the passage 23, the transverse passage 25, of the head 19, and a pipe 82 to the atmosphere. The motive fluid is thus admitted under pressure at one end of the cylinder while the opposite end is connected to exhaust. Consequently the piston 13 and the drill or whatever is connected to the rod 50 will be moved until the piston occupies its opposite extreme position. In moving from the position in which it is shown in Fig. 1 to its opposite extreme position, the tappet 17 is moved outwardly and produces a rotative adjustment of the cylindrical valve member, by reason of the engagement of the lower endof the tappet with the cam surface of the piston head 52 as hereinbefore pointed out.

The arrangement of parts is evidently such that the tappet 16 is permitted to move in wardly into a position corresponding to that of the tappet 17 as shown in Fig. 1 when the tappet 17 is actuated.

The grooves 40, 41 and 42 and the gates 60, 61 and 62 and 63 are so placed relative to the adjustment of the cylindrical valve member, that the end of the main cylinder, which was connected to the exhaust passage 23, is connected to the supply passage 24, while the opposite end of the cylinder is connected to the exhaust passage 23. The opposite ends of the cylinders are thus alternately connected to the source of motive fluid and to exhaust, and a reciprocatory movement is imparted to the piston and to whatever is connected to it. Attention is directed to the fact that this reciprocatory motion of the piston produces an oscillatory motion of the cylindrical valve member. This mechanical mechanism is believed to be broadly new and I desire not to be limited to any particular embodiment of my invention.

What I claim is;

1. The combination with a reciprocatory member, an oscillatory member substantially parallel to the direction of motion of the reciprocatory member and interposed interchangeable and reversible tappets actuated by the reciprocatory member and adapted to oscillate the oscillatory member.

2. The combination with a main cylinder, provided with ports, a piston therein, a valve cylinder provided with ports arranged to be connected with the main cylinder ports, a controlling valve in the valve cylinder comprising an intermediate member and a pair of interchangeable end members, of mechanism actuated by a longitudinal movement of the main piston to produce a rotative adjustment of the valve.

3. The combination with a main cylinder provided with ports, a valve cylinder associated therewith, a main piston and a cylindrical valve member, of a plurality of detached reversible tappets acting directly on the valve member and actuated by the piston to produce an oscillation of the valve me1nber.

l. The combination with a main cylinder provided with ports, a valve cylinder substantially parallel and associated therewith,

a main piston and a cylindrical valve member, of a t-appet block located between the main piston and the valve member, a pair of detached reversible tappets associated with said block and actuated directly and alternately by the main piston as it is reciprocated, to produce an oscillation of the valve member.

5. The combination with a body having a pair of substantially parallel cylindrical openings respectively constituting a main cylinder and a valve cylinder, and longitudinal passages located one on each side of the valve cylinder, and interchangeable heads secured to the body to close the cylindrical openings, of a main piston adapted to reciprocate in the main cylinder, a valve member adapted to oscillate in the valve cylinder and comprising an intermediate member and a pair of interchangeable end members, and means dependent upon a reciprocatory movement of the piston to produce an oscillatory movement of the valve member.

6. The combination with a body having a (topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

pair of substantially parallel cylindrical openings respectively constituting a main cylinder and a valve cylinder and longitudinal passages located one on each side of the valve cylinder, and interchangeable heads secured to the body to close the cylindrical openings, of a main piston adapted to reciprocate in the main cylinder, a valve mem ber adapted to oscillate in the valve cylinder and comprising an intermediate member and a pair of interchangeable end members, and a plurality of tappets acting directly upon the valve member and actuated directly by the piston at opposite ends of its travel.

7. The combination with a body having a pair or" substantially parallel cylindrical openings respectively constituting a main cylinder and a valve cylinder and longitudinal passages located one on each side of the valve cylinder and interchangeable heads secured to the body to close'the cylindrical openings, of a main piston adapted to reciprocate in the main cylinder, a valve member adapted to oscillate in the valve cylinder and comprising an intermediate member and a pair of interchangeable end members, a tappet block set in the body between the two cylinders, and tappets sliding in grooves in the tappet block and alternately actuated by the piston to reciprocate the valve member.

In witness whereof, I have hereunto set my hand this l day of September, in the year THOMAS E. STURTEVANT. Witnesses F. GRAVES, R. J. DEARBORN.

Washington, D. G.

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