US941732A - Internal-combustion rock-drill. - Google Patents

Description

L. L. s00TT. INTERNAL COMBUSTION ROCK DRILL.

APPLICATION FILED NOV. 2, 1908.

- Patented NOV. 30, 19409.

UNITED sTATEs PATENT oEEioE.

LEWIS L. sooTT, oF `Jo1 LIN, Mrssouu.

To all whom it may concern:

Be it known that I, LEWIS L. SCOTT, a c1t1- z'en of the United States, residing at Joplin,-

in the county of Jasper and State of Missouri, have invented a new and Improved Internal-Combustion Rock-Drill, of which the following is a specification.

This invention relates to improvements in linternal combustion rock drilling machines or engines, intended for use in minesand quarries for the drilling of holes to receive explosive charges for displacing or breaking' away the rock or mineral.

The objects of this invention are: to produce a gas actuated rock drill which shall be of comparatively small dimensions, of compact, simple and inexpensive construction, having all moving parts entirely inclosed and thereby protected from damage consequent upon the rough handling such machines usually receive at the hands of their operators.

A further object is to provide an engine `in which the piston is practically free (moved upward and downward entirely by the action of the internal fired gases upon it), yet connected to a crank shaft, (through a connecting rod which is slidingly and yieldingly connected to same,) said: shaft being for the purpose of limiting the stroke of said piston, and being a means of manually starting said engine.

To these ends my invention consists in various features of construction and arrangement of paris, as hereinafter described, illustrated in, the accompanying drawings and particularly pointed out in the appended claims.

Referring to the accompanying drawings which form a part of this specification, Figurel 1. is a horizontalA plan view, (shown partly in section), of my improved internal combustion rock drill. Fig. 2. is a. vertical longitudinal section of same. Fig. 3 is a front end view'of F ig. 2, with head 2l removed. Fig. 4 is a section on the line X. X. of Fig. 2. Fig. 5 is a sectional View of a generator valve, (commonly used on two This valve forms no part of the invention, but is shown for a.

purpose that will be seen later. Fig. 6 is an enlarged sectionalfview of the piston l0, on the line Y. Y. of Fig. 2. Fig. 7 is a side View of the bumping piece 4T.v Fig. 8 is an end view of seme.

Specification o'f Letters Patent.

Application led November 2,' 1908.

INTERNAL-coiviBUsTIoN Rock-DRILL.

4 Patented Nov. 30, 1909.

Serial No. 460,732.

-Like partsare represented by similar numerals of reference in the several views.

The numeral l denotes, what I term as the lirst or up er cylinder. rfhe explosive chamber 4G of t ie cylinder l is closed by the head l2; the chamber 2, (which receives the explosive mixture, drawn in at Vthe connection 4, through a valve such as shownj in Fig. 5)

is closed by the crank case 3; the said crank case 3 carries the main journals 44 of the crank shaft; the balance wheels 1l join the main shafts 44 through the crank pin 45. The piston l0, (which is attached or connected to the piston 33 through the rod 36), is provided with the grooves 19; the` piston pin 8, (which is connected to the crank pin 45 through the rod 5), has ends, (made in square section), that project beyond the bearing surface ofl saidf pin in the rod 5, these ends are adapted to work or slide in the grooves .19 of the piston l0; the sliding movement of the pin 8 is limited,- and is stopped on one ,side b the piece 47, (which bears against the said projectionsof pin 8, said piece 47 carries "the spring 42 which bears against the inner front wall of the piston' 10), and on the other side by the tool steel pieces 18, which are placed in the slots 22 of the piston 10 (refer to Fig. 6). vrlhe long ways 39 form a part of the casting l and vserve as slides, (which can be mounted on the shell and tripod commonly used on rock drills), and also forms a guide for the cylinder' 13 which is secured to the ways 39 by the screws 4l; the second or lower cylinder 13 is also secured to cylinder l by the bolts 48. The head l2 serves the purpose of closing the explosion chambers 15,`and 46, and also forms a journal for the rod 3G and carries the packing rings 34, which fit around the rod 36, to prevent the escape or leakage of gas from o-ne explosive chamber to the other; thc head l2 is clamped and held firm between the cylinders l and 1?, by the bolts 47 which are secured to the said cylinders. The cylinders l and 13, and connected parts, are adjustable by the screw 37, or by some other equivalent or convenient device, in connection with which the usual shell and tripod support may be utilized.

The explosive chamber 15 of the cylinder 13 is closed by the head l2; the chamber-20, (which Ireceives the explosive charge, through a valve such as shown in Fig. 5, at the opening 4), is closed by the head 21; the said head 21 carries the chuck 30, which is adapted to rotate in the head 21. The cylinder 13 is enlarged at its outer end to make room for the enlarged portion of the rotating piece 35. The said rotating piece 35 is rotatively mounted in the enlarged portion of the cylinder 13, and has a small elongated projection, on the perimeter' of which are cut the spiral grooves 29; the rotating piece 35 has a small central. bore el?) through the elongated projection of the rotating piece 3o; in this bore the shank of the -drill steel 17 projects for a short distance; the hammer piece 23 of the piston 33 tits snugly in the said bore 43 and is adapted to reciprocate in the said bore and strike the shank of the drill steell 1i' on each .downwarld'stroke of the pistons. The piston 33 carries the pins 32, (and .is rigidly attached thereto), which are adapted to work in the spiral grooves 29, of the rotating piece 35, and .in the straight grooves 27 of the cylinder 13,' The rotating piece 35 carries the 'pawls 2%, The chuck 30 has an enlarged diameter at its inner end, and on the circumference of this enlarged diameter are cut the common ratchet teeth d0. The pawls 24 are adapted to work in the said ratchet teeth, and are held in engagement with same by the springs 25. rlhe drill. steel 17 may be provided with. the lugs 26, which tit in the grooves 28 of the chuck o0, so that if the chuck .is rotated the drill steel will be compelled to rotate in unison with it.- As the piston 33, (and all rigidly connected parts), moves upward the pins 32 (which travel in a straight line with the said piston and also work in the straight grooves 27 of the cylinder 13), working in the spiral grooves 2) of the rotating' piece 35, will cause the latter to rotate a small amount; the rotation is transmitted troni the rotating piece 35, to the drill steel 17, through the pawls 2st, which engage the ratchet teeth 40 ot' the chuck 30; Athe said chuck 30- causing the drill steel-to rotate with it as before described; on the down stroke of the piston the pawls 2li run away from the ratchet teeth as will be fully understood.

Any suitable sparking mechanism, commonly used on gasolene engines), may be utilized to explode the charges after they have been introduced into the explosive chanibcrs. l do not wishto be restricted to any particularkind.

rlhe operation of my improved internal combustion rock drill is as follows: Assuming that an explosive charge has been drawn into the chamber 2, (on the downwmd movement ci the pistons, at opening it through a valve such as shown in Fig. 5), as the Ypistons move backward a similar charge will be drawn into chamber 20, (at Il through a valve such as shown in Fig. o), while at the allinea,

same time the charge in chamber 2 is being compressed; when the pistons approach the end of the backwardfstroke the charge in chamber 2 will rush' through the passage 9 into the explosive chamber 46 of thecylinder 1; as the pistons move forward the charges in chambers 4G andy 2O willi-,be compressed, while at the same time a new charge will be drawn-into the chamber 2; as the pistons apn preach the end of the downward stroke the charge in chamber 20 rushes into the explosive chamber 15 et the cylinder 13, (through the passage 9), at this time the charge in chamber 46 is err loded, (by means of a spark commonly used on gasolene engines), and the pistons will be driven backward under the pressure of the explosion in chamber' 1G; as the pistons move backward a new charge is drawn into chamber 20 and the charges in chambers 2 and 15 are compressed; as the pistons reach the terminus of the upward stroke the burned gases are exhausted from chamber 46 through the port 7', while at the same time `the charge in chamber 2 rushes in'to chamber a6, and the charge in chamber 15 is exploded, (by a spark commonly used on gasolcnc engines), and drives the pistons downward. As these voperations continue it will be plainly' seen that an explosion will occur in chamber 46 on every upstroke, and a similar explosion will occur in chamber-,15 on every ldown stroke; further, that as the pistons move downward, (by reason of the explosion in chamber 15), the piston pin S, (which is connected to the crank pin 45 through the rod 5), will slide backward until it bears against the pieces 18, and will then be pulled forward with the-piston. i llhen the pistons approach the end of the downward stroke, the projection Q8 of the piston 33 will strike the shank of the drill steel 17,- and said drill steel being in contact with the rock tace, will penetrate same. Should the projection 23 strike the said shank bctore the crank pin 4:5 reaches the dead center line, the pistons will come to a stop, but the crank will continue around moving the piston pin S'forward in the slides 19 ot' the piston 10. 1When, the crank pin 45 reaches the dead center lineian explosion occurs in chan'iber 4G (as before described) and drives the pistons backward; on the backward stroke the pin 8 will slide forward and bump against the spring 12, through the piece d?. lt will be plainly seen that the result ot this action is that of a free piston; the pistons heilig moved entirely by the pressure of the exploded charges, and not by energy stored in lly wheels. vThe crank shattscrves the purpose ot' limiting the stroke ot the pistons, (to insure the proper port opening, and to prevent an over stroke), without receiving any jar from the impacts of the pistons. aid crank is also a means of manually imparting motion to the said pistons, for the purpose of starting the said engine.

The rotation ofthe drill steel occurs as before described,

Various changes in details of construction of component parts of the machine may be made without departing from the principle and intended scope of the invention.

Having fully described my invention,what I claim as new and desire to secure by Letters Patent isze 1. In an internal combustion rock drilling engine, a pair of spaced cylinders, a guide head connecting said cylinders, a piston slidable Within the interior of each cylinder and dividing the same into mixing and explosion chambers' said explosion chambers being located proximal to said guide head; a piston rod slidable within said guide head and connected at opposite ends to said pistons; a crank shaft, a connecting rod connected to said crank shaft, and yieldingly connected to the adjacent piston, and a rock cutting drill bit arranged. in striking relation to the other piston.

2. In an internal combustion rock drilling engine, a pair of s aced cylinders, a guide head connecting sai cylinders, a piston slidable within the interior of each cylinder and dividing the same into mixing and explosion chambers, said explosion chambers being located proximal tosaid guide head; a piston rod slidable within said guide head and connected at opposite ends to said pistons; a crank shaft, a connecting rod connected to said crank shaft and yieldingly connected to the adjacent piston, for independent nievement with respect thereto, and a rock cutting drill bit arranged inl striking relation to the other piston.

3. ln an internal combustion rock drilling engine, a pair of s aced cylinders, a guide head connecting said) cylinders, a piston slidable within the interior of each cylinder and dividing the same into mixing and explosion chambers, the explosion chambers being located proximal to said guide l1ead; a piston rod Islidable within said guide head and connected at opposite ends to said pistons; a crank shaft, a connecting rod connecting said crank shaft and connected to said connecting rod, and upper piston; cushioning devices carried by the upper piston and a rock cutting drill bit arranged in striking relation to the other piston.

l. A motor drill comprising a pair of opposed explosive engines arranged in alinement with cach other and having their pistons nmtually connected, the upper piston heilig formed with a socket and with longii y i l tudinal slots communicating therewith; crank shaft, a connecting rod, connected 'te said shaft, formed with an eye at its lower end, a transversel disposed pin carried in ce the eye of said ro having its ends arranged for sliding movement in said longitudinal. slots, whereby an inde endent movement of said shaft is permitte means for limiting such movement in beth directions and a rock cutting drill bit arranged in striking rela" tion to the lower piston. A

5. A motor drill comprising a pair of opposed explosive engines arranged in aiine ment with each other and having their pis tons mutually connected, the interior of tlo cylinder of each engine being divided inte mixing and an explosion chamber, the enpio sion chambers of the engines confronting each other; the upper piston being form with a socket and with longitudinal f communicating therewith; a crank si connecting rod connected to said formed with an eye at its lower end, a Versely disposed pin carried in the eye saidrod having its ends arranged for s ing movement in said longitudinal slet whereby an independent movement of si shaft is permitted; yielding means for li ing such movement in one direction, a means for limiting such movement in t. posite direction, and a rock cutting drill arranged in striking relation to the lower piston. l

6. A motor drill comprising apair of op" posed explosive engines arranged in verticai alinement with each other and having their pistons mutually connected, the upper pis being formed with a socket and with longitudinal slots communicating therewith, if crank shaft, a connecting.; rod, connected te said shaft, and formed with an eye at its lower end, a transversely disposed pin carried in the eye of said rod having its ends arranged for sliding movement in said` sie* whereby independent inoven'ient of seid crank shaft with respect to said pistons is permitted; yieldin means interposed tween the inner wa l of said socket and sa?? pin for limiting the sliding movementJ of latter in one direction and means located jacent the outer end of said socket for ii' ing such movement in the opposite dirci and a rock cutting drill bit arranged in sti ing relation to the lower )iston.

ln testimony whereof i have hereunto my hand thisI 29th day of October d,

LEWIS L. SCtlT.

ilo

Witnesses ELLnN M. li/tnnriir, T. .l'. "Wenns

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