US1760316A - Drilling mechanism - Google Patents

Description

May 27, 1930. c. F. osGooD DRILLING MECHANISM Filed March 13, 1924 Patented May 27, 1930 UNITED STATES PATENT FFICEv CHARLES '.E. OSGOOD, 0F CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY, A CORPORATIGN OF MASSACHUSETTS i DRILLING MEGHANISM Application filed lMarch 13, 1924. Serial No. 699,122.

This invention relates to drilling mechanism.

An object of my invention is toV provide an improved drilling mechanism. Another object is to provide an improved drilling mechanism in which is embodied feeding mechanism, a tool rotation mechanism, automatic means for controlling the feeding mechanism which is responsive to variations in the resistance to rotation of a tool, and a hammer piston. A further object of the in-v ventionis to provide an improved means for controlling. the same. Another ob] ect of my invention is to provide an improved manual i controlling means comprising a plurality of partly broken away to show details of construction.

Fig. 2 is an enlarged longitudinal transverse fragmentary section taken on line 2-2 of Fig. 1.

Fig. 3 is a horizontal transverse section on line 3-3 of Fig. 1.

Fig. 4 is a detail sectional view of the manual controlling valves.

In the illustrative form of my invention I have shown the same embodied in a stoper type of drill which comprises the usual motor cylinder 1 having at its upper end a steel receiving chuck 2 rotatably mounted in a chuck housing 3 carried on the forward end of the cylinder, the steel 4 and chuck 2 being rotated as by a gear 5 mounted upon a rotatable shaft 6, the lower end of which carries one of two intermeshing rotation motor rotors 7 adapted to be actuated by a suitable source of fluid supply controlled by a main control valve 8 rotatably mounted in the head 9 carried on the lower end of the motor cylinder 1. `Projecting downwardly from, the head 9 and positioned coarially with the axis of the motor 1 is a feed cylinderV 10 within which is slidably mounted a piston and piston rod 11 and 12 respectively, the latter having non-rotatable engagement with the cylinder 10 as by alie 13 and terminating in a two point swivele foot piece 14., rIhe key 13 is desirable in view of the fact that part of my mechanism to be describedl is controlled by resistance to rotation of the tool.

The particular means for `controlling the feed so that' the control thereof will be responsive to variations in the resistance to steel rotation comprises a valve 15 disposed, herein shown astransversely, but which could be in any direction desired, in a bore 16 formed lin the head 9, theouter ends of which terminate in enlarged bores 17 and 18 respectively closed by plugs 19 and 20. More specifically,A the valve 15 has anr annular groove 21 Vformed in` the periphery ofk the main cylindricalv portionA thereof and from.-

which a stem 22 projects to carry a conical shaped valve member 23 which has flat portions 24 thereon to allow a certain amount of fluid toflow as-will be hereafter described. The opposite end of the valve 15 carries an enlarged piston 25 reciprocably mounted' within the bore 18 and said valve isv held in substantially balanced condition as by a spring 26' surrounding a stem 27projecting outwardly from the piston 25. The valve structures@vv far described is capable of cooperation with vsuitable passage means to decrease or shut down the flow ofactuating fluid tothe feed cylinder and to increase the flow of fluid to the rotation motor as the resistance to' rotation of the tool lincreases. To accomplish this functionv a passage 28A communicates with the main control valve andv terminates in the supply chamber 17 A passage 29 communicates with said supply chamber and the feed' cylinder `as by the annular groove 21 in the valve 15?, the latter being in the position shown in Fig. 2, and the valve the tool. At the sam-e time iuid will iiow from the chamber 17 past the flattened portibns 24 and through passage 30 to the inlet chamber 31 of the rotation rotors 7. Communicating with the chamber 31 is a passage 32 leading to the chamber 18 on the outer side of the piston 25. rIhe fluid for actuating the hammer piston may be controlled oy any suitable port means in the main control valve 8, but in order to .control the feed and rotation independently thereof, I have provided a valve 33 longitudinally movably and centrally disposed in the main control valve 8 which is adapted to control flow of fluid through a port 3e and annular groove 35 which in turn controls the flow of fluid through passage 28 leading to the constant fluid supply chamber 17. rlhe central valve 33 is actuated by a trigger lever 36 pivotally mounted upon the main or throttle lever 37. Rotation of the main control valve 8 can permanently disconnect tl e annular groove 35 and the passage 28 for completely shutting down the drill.v If, however, it is desired to shut off only the feed and rotation mechanisms, the trigger controlled lever 36 may be instantlyA actuated.

In the operation, assuming the motor hammer piston to be running and with pressure fluid flowing throughk passages 29 and 30, respectively, tothe feed and rotation mecha isms causing the same to be actuated, as resistance to rotation of the tool 4 varies, such for instance that it should increase above normal, caused by being caught in a seam, or other reasons, the rate of rotation of rotors 7 will decrease which will reduce the amount of air consumed, thereby with a resultant increase of pressure in the chamber 31. Dur-- ing normal operation, fluid to the feed cylinder would flow through passage 29 and annular groove 21 thereto, but when pressure flowing from the passage 30 is built up in` chamber 31 as mentioned, the same is trans-y mitted through passage 32 to chambery 18 to u. cause movement of valve 15 in a left hand direction thereby partially restricting or shutting olf the passage29 and cutting down or preventing further flow of actuating fluid to the feeding mechanism. However, on

l said movement, the conical valve portion 23 will be moved away from its seat and with the aid of the flattened portions 24 more air will be allowed to flow through the passage 30 to :the rotation motor, thereby causing greater rotative force to be exerted upon the tool 4. U on a decrease of resistance to rotation, p essure for actuating the rotation rotors 7 will be decreased with a resultant decrease of pressure in the chamber 18 and moving of the `valve 15 to its right hand position until the pressure within the chamber 17, acting upon the outer end of the valve 15 is equal to the pressure in the chamber 18 plus the pressure of the spring 26. It will herein also be noted that when the supply of pressure fluid to the stantially no air is wasted in controlling the.

feed for I decrease or shut the supply off and the feed cylinder is vented to atmosphere only when desired as by a usual bleed port in the valve 8. Also by my improved construction I not only have automatic control of the feeding` but also an instantly operable manual control so inter-related with respect to the automatic means that instant control can be had of only the most vital elements such as the rotation and feeding.

l/Vhile I have in this application specifically' described one form which my invention may assume in practice, it will be un derstood lthat this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claim.

. VV hat I claim as new and desire to secure by Letters Patent is: f

The combination in a drilling mechanism comprising a tool, rotation means therefor actuated by fluid pressure, fluid actuated feeding means for said tool, and means responsive to the resistance to rotation of -said tool for automatically shutting down the flow of fluid to said feed andV increasing the flow CHARLES r. o'sGooD.

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