US2407679A - Drilling apparatus - Google Patents

Description

Sept. 17, 1946.

w. w. PAGET DRILLING APPARATUS 3Sheets-Sheet 1 Filed Dec. 21, 1942 Patented Sept. 17, 1946 YnniLLnvG APPARATUS Win w. Paget, Michigan City, Ind., team to Joy Manufacturing Company, a corporation .of

" Pennsylvania Application December 21, 1942, serial No. 469,646

This invention relates to drilling apparatus, and more particularly to feeding means for a drilling apparatus of the rotary type. l 6

It, is an object of thi invention to provide an improved drilling apparatus. It is another object to provide improvedmeans for feeding a drillingapparatus; Still another object is to provide an improved fluid actuated feeding de- ,vice for a drilling apparatusof the rotary type, said feeding device having means associated therewith for controlling the rate of feed of said .drilling apparatus in accordance with the resistance-to rotation, of the drill bit. Another object is to provideimproved feeding means for a drilling apparatus, said feeding means including ,aefluidactuatedimotor of the rotary type having its rotor in threaded engagement with a feed screw. ,Still another object is to provide a fluid actuated motor of the. rotary type supported for bodily movement with a drilling, apparatus and having its rotor in threaded engagementwith a feed screw, whereby a feeding of the drilling apparatus is obtained on relative movement between said: rotor and; saidqfeed screw. Other objects and advantages will appear in the course of the following description.

In the accompanying drawings, in which, for purposes of illustration, a drilling apparatus in which the illustrative. embodiment of my invention is embodied is disclosed, together with a modification thereof: Fig. 1 is aside elevational view of a drilling apparatus having myinvention incorporated therem Fig. 2 is a plan View of the drillingapparatus shown in Fig. 1. 1

Fig. 3 is a perspective view of a portion of the drilling apparatus with parts broken away to show the improved feeding means. l 3 ":Fig. 4 is an enlarged vertical sectional view "t'akenfon the plane of the line 4-4 of Fig; 2.-

' 'Fig. 5 is an enlarged fragmentary sectional view taken in the plane of Fig. 4 and showing the feed control valve in its forward feeding position... I l :Fig. 6 is a view similar to Fig. 5 but showing the feed control valve in its reverse feeding position. A

Fig. 7 i an enlarged cross sectional view taken substantially on the planes of the line 1-! of ,Fi 4. I l

Fig. 8 is a fragmentary sectional view taken on' the line 8 j-8 of Fig. 10.

Fig. 3 is a vertical sectional viewtaken on line 6 Claims. (Cl. 25545) 2 e 9 of Fig. 5, illustrating the torque-controlled valve means. t v

Fig. 10is an enlarged horizontal sectional View taken on the line Ill-l0 of Fig. 1; l l 1 Fig. 11 is a fragmentary cross sectional view illustrating a modification of the feeding means.

In the accompanying drawings there i shown a drilling apparatus, generally designated I, comprisingbitrotatin means, generally designated 2, feeding means, generally designated 3, and supportingand guiding means, generally designated 4.

The supporting and guiding means comprises an elonated troughlike guide member 6 open at its lower side and having a swivel plate I at its upper side adapted to be secured in the saddle mounting of a conventional rock drill support. Formed along the sides of the guide member, as shown in Fig. '7, are guideways 8 slidably receiving flanges in formed on a rear head member I l of the bitrotating means 2 for supporting and guiding the latter for movement relative to the work.

The bit rotating means 2 includes a rotating motor [2 carried by a control head 13 attached, as by screws, to the rear head member II. The motor is herein of the high speed electric type and includes a casing l4 provided with front and rear heads l5 and It held in assembled relation with respect to the casing by usual tie bolts IT. The motor is provided with field windings l8 and an armature rotor I9, the latter having a shaft 20 which is journaled in bearings 2|, 2| suitably supported in the motor heads. Attached to the forward end of the shaft 20 is a chuck 22 for receiving the shank of a hollow drill rod 23 carrying a drill bit 24. The rear motor head has a cylindric projection 25 mounted for limited rotation in ball bearings 26 supported within a bore 21 formed in the control head l3. The bearings are retained in the bore 21 by a retaining ring 29 secured, as by screws 30, to the control head; and the cylindric projection is held against axial displacement with respect to its bearings by an end plate 32 secured, as by screws, to the projection 25. Extending through a bore in the shaft 20 is a liquid conducting tube 33 which is threaded at its rear end within a member 35 secured to the control head I3, and cleansing liquid issupplied through a passage 35 in the member 35 to the tube 33 where it is conducted to the hollow drill rod and through the latter to the drill hole. Electric energy may be conducted to the motor i2 from any convenient source through a conventional connector plug 43 under the control of a manually actuatedvalve 45. Liquid is also supplied from thecham ber 43, Fig. 8, to a passage 46 commuhieating,

under the control of a manually operated valve 48, with a passage 49 opening into a groove'fi'il in the head member H. The groove50' corn: municates with the passage 36 leading to the liquid conducting tube the motor power.

It will be seen that in the absence ofliquid in the chamber @3 at theproper pressure;

shaft.

the motor switch 46 will be opened so that drilling will not take place without an adequate supply of cleansing liquid to the drill hole. The drill motor and its control means are similar to that disclosed in my copendiiig application, Serial No. Z 68;'792, now Patent No. 2,288,541; granted June 30, 1945, and further description-' 1" the same herein is accordingly unnecessary.

Referring to the drill feeding means, it will be noted that there is provided "a feed screw Mextending longitudinally through thetroughlike guide member fiinparallelism "with the. guide;- ways 8, and the feed screw is journaled at its front and rear ends in plates 55 and 56 attached, as by screws, to the ends of the guide member.

Fixed to the rear end of the feed screw is an opdescribed. There is a'ohamber 60 formed within o.

the head member I l and opening through one Wallthereof. A cover plate 6| attached to the head member H, as by'screws 62-, closes the open end of the'chamber Bil, and. has a bore 63 providing a bearing for a reduced end of the rotor 59. A bore 65 in the head' member ll provides a bearing for the other end of the rotor, this end also being reduced. Surroundingthe reduced ends of the rotor are packings 66 held in fluid tight engagement with the ends by sleeve shaped members 58 attached to the head member II and the cover plate 6 i, to prevent the escape of liquid from the chamber 60.

Arranged Within the chamber 66 is a ring shaped member surrounding the rotor 59 and having an inner peripheral surface 12 which is engaged by the outer radial ends of vanes M slidably mounted in slots 75 formed in the rotor and extending longitudinally of the latter. The

surface 72 is shaped so as to provide two di-* ametrically positioned arcsll (Fig; 7) close to the outer periphery of the rotor ands'ubstantially concentric with the latter. The arcs ll extend in a circumferential direction for adistance equal at least to the angular distance between a pair of adjacent vanes so as to provide a continuous seal preventing the flow of operating fluid between the rotor and the ring 10 along the arcs.

The surface E2 on the ring also has two diamet- I rically positioned arcs l8 spaced from the outer 4 periphery of the rotor and-joined by surfaces 19 to the ends of the arcs H to provide working chambers 80. Formed in the head member II and the cover plate (ii at the end of the'chamber are arcuate grooves '82, 82 and 83, 83 3 opening into the ends of the working chambers 80, as shown in Fig. 7. Whenoperating pressure" fluid is supplied to the working chambers through the grooves 82; 82 and' is vented from the working chambers through the rooves 83, .83, the fluid acts on the vanes 14 to turn the rotor in a counter-clockwise direction,as viewed in Fig. 7, and effect a forward feed of the drilling-apparatus; When the groove 82, 82 are connected toilexhaust -and fluid is supplied under pressure to the working chambers through the grooves 83', 83, the rotor is caused toturn in a clockwise direction and effect a rearward feed of the drilling apparatus. The adjacent ends of the grooves 82, 83 within each of the working chambers are spaced apart a distance equal at least to the angular distance between a'p'air of adjacent vanes so as to'prevent afree passage between the inlet-[and 'exhaust through-jwhich operating fiuidmight pass through'the-motor without performing its working function, Any suitable means, such as appropriately. arranged and controlled'passagemeans in ther-otor may be' provided for'supplying' operating fluid from the working chambers to the g'rooves 15 at the inner 'ends of the vanes 'M'so that the fluid may act on the vanes for l'iolding the latter'a'gain'st the surface E2 on the ring F0; or any other suit vided with a stem 89 projecting rearwardly through a sleeve shapedxmember 90 threaded into an openingin the control head. I At the front and rear ends of the valve bushing are chambers 92 and 93 connected together-by a; groove94' and communicating with exhaust through a Sealing rings 98 are. supported I passage 96. within the sleeve member 90 and sealingly engage-the valve stem 89 for preventing the escape of operatingfluid from the chamber 93 rearwardly along the valve stem. The rear end of the valve stem is secured to an operating handle 99 having an enlarged portion I l'09 slidably 'fitting within the sleeve member 90 whereby the valve 45 may be adjusted to any of its positions within the valve bushing. 7

Opening through the valve bushing near the rear end of the latter is a port llll communicating with afpassage I02 in the control head 1 The passage I62 opens into a passage I03 extending through the head member H to forked passages. I04 and H35 (Fig. '7) opening into the grooves 83.

Near the forward end of the valve bushingpisa port l0! for supplyin operating fluid-from the interior of the Valve bushing to a groove 108 which opens, as shown in Fig. 8, into a forward feed passage I99. Fluid supplied to the passage W9 is conducted under the control of a torque controlled valve, general1y designated Hi, to a passage H2 opening; assh'own'fingFig. ['7 into branch passages I I3 lld'leading to'thelar 'cuate grooves 82 ofthe feed motor. Formed in shown in Fig. 5.

the'valve bushing between the ports ml and I0! is a port II6 connecting the supply chamber 43 to the interior of the bushing. The valve 45 is provided with a reduced portion II'I between its ends so as to form an annular space II8 between the inner surface of the valve bushin and the reduced portion of the valve through which fluid may pass from the port II6 to the port IOI when the valve is in its most rearward position, as shown in Fig. 6. Formed in the valve 45 are radial ports I and I2I opening into a chamber within the valve for connecting the ports I I6 and I0! in the valve bushing in communication with each other when the valve is in the position Opening through the valve bushing in advance of the port I0! is a port I23 communicating with a groove I24 for supplying pressure fluid, as shownin Fig. 10, to a passage I25 communicating past a manually controlled valve I26 with a passage leading to the diaphragm 42 for the motor switch 40. When the valve 45 is in its most forward position pressure fluid is supplied from the chamber 43 through the annular space II8 surrounding the valve 45 to the port I01, and is also supplied through the space H8, the ports I20, the chamber within the valve and the ports I2I to the port I23 in the valve bushing. i The torque-controlled valve III comprises, as shown in Fig. 9; a valve sleeve I30 arranged within a transverse bore I3I in the control head. Extending through the valve sleeve is a valve member I32 having a valve portion I33 cooperating with a valve seat I34 at the junction of stepped bores I35 and I36- formed within the valve sleeve for controlling the flow of operating fluid from the forward feed passage I09 to the passage H2. The valve member I32 is threaded into a sleeve shaped member I40, and a spring I4I acts against the member I40 for urgin the valve portion I33 away from the valve seat I34. Formed in the sleeve shaped member I40 is an annular groove I43 for receiving a pin I45, Fig. 4, fixed to the plate 32 at the rear end of the drill motor. During the operation of the drill motor, the motor casing tends to rotate in a direction opposite to the direction of rotation of the rotor. Since the rear motor head I 6 is connected rigidly to the motor casing and the plate 32 is connected to the rear motor head, there is a tendency to move the pin I45 in a direction to force the valve member I32 toward its closed position against the action of spring I4I during operation of the drill motor.

Spring MI is designed to hold the motor casing against rotation when the resistance to rotation of the drill bit is below a predetermined value.

'If the resistance to rotation of the drill bit exceeds the predetermined value, the valve member I32 is moved toward its closed position for reducing or cutting off the flow of operating fluid through the forward feed passages to the feed motor 58.

The operation of the mechanism described above is as follows. To effect a feeding of the drilling apparatus toward the work by means of the feed motor 58, the operator grasps the handle "99 for the valve 45 and moves the latter to the position shown in Fig. 5. Operating fluid then flows from the supply chamber 43 through the port H6 in the valve bushing and the ports I20, I2I in the valve 45 to the port I0! opening into the groove I08. Then fluid is conducted through the groove I08 to the forward feed passage I09 where it is conducted past the torque-controlled valve I I I to the passage I I2 leading to the branch 6 passages I I3, I I4 opening into the arcuate grooves 82. The operating fluid passes from the grooves 82 into the spaces between the vanes carried by the rotor and acts against the vanes to turn the rotor in a direction to effect feed of the drilling apparatus in a forward direction along the feed screw. As the vanes pass over the arcuate grooves 83, 83, the fluid is discharged from the spaces between the vanes through the grooves 83 to thebranch passages I04, I05 where it is conducted to the passages I03 and I02 leading to the space 93 at the rear end of the valve 45. The fluid is discharged from the space 93 through the groove 94 and the space 92 at the forward end passages I25 and is conducted under the con- I trol of the manually operated valve I26 to the diaphragm 42 closing the switch 40 and starting the drill motor. At the same time, fluid is delivered from the chamber 43 through the annular space IIB surrounding the valve 45 tothe groove I08 Where it is delivered to the forward feed passages for effecting the forward feed of the drilling apparatus during drilling. i As long as the resistance to the rotation of the drill bit does not exceed a predetermined value. the torque-controlled valve will remain open so that operating fluid may flow to the feedmotor for operating the latter to effect feeding of the drilling apparatusin a forward direction. When the resistance to rotation of the drill bit exceeds a predetermined value, the motorcasing turns and causes the pin I45 to force the torque-controlled valve toward its closed position against the action of the spring I4I thereby reducing or completely cutting off the flow of operating fluid to the feed motor 58. I If it is desired to feed the drilling apparatus in a rearward direction .the operator grasps the operating handle 99 and moves the valve 45 into the position shown in Fig. 6. At this time operating fluid is delivered from the supply chamber 43 through the annular space II8 surrounding the valve to the reverse feed passages I02 and I03 communicating with the arcuate grooves 83 of the feed motor through branch passages I04 and I05. The fluid entering the feed motor through the grooves 83 acts on the vanes 14 for rotating the rotor of the feed motor in a direction to effect a reverse feed of the drilling apparatus along the feed screw. As the vanes pass over the arcuate grooves 82, the fluid is discharged from the feed motor to the branch passages I I3, I I4 where it is conducted through the passage II2 past the torque-controlledvalve to the passage I09 and through the groove I08 and the port I01 in the valve bushing to the space 92 where it is discharged to the exhaust passage 96.

The feeding of the drilling apparatus either in aforward or rearward direction may be controlled by rotating the feed screw manually through the operating handle 5! connected to the rear end of the feed screw while operating fluid is being supplied to the feed motor. By rotating the feed screw in the direction in which the rotor of the feed motor is turning, the rate of feed of the drilling apparatus may be reduced, and an increased rate of feed is theoretically obtained by riphery f a rotor I53 supported on the head member I I for rotation on an axis parallel to the axis of the feed screw. Passages I55and I56 are provided in the head member II for supplying and discharging operating fluid relative to the rotors at opposite sides of their meshing portions, the passages being connected selectively to supply and exhaust under the control of the valve 45, as in the preferred form of the invention. When operating fluid is supplied to the rotors through the passage I55, the rotor I49 is caused to rotate in a counter-clockwise direction, as viewed in Fig. 11, and effect a forward feeding of the drilling apparatus. As the rotors turn on their axes, fluid supplied from the passage I55 is carried in the spaces between the teeth of the rotors to the passage I56 which will be connected to exhaust. By supplying operating fluid to the feed motor through the passage I56 and discharging the fluid from the motor through the passage I 55, the rotor I49 is caused to rotate in a direction to effect a rearward feeding of the drilling apparatus. The supply of liquid under pressure to the passage I55 is regulated by a torque-controlled valve as in the preferred form of the in-, vention. By adjusting the valve 45 to trap liquid in both the supply and discharge spaces of the motor, the rotor will be locked against rotation in either direction.

As a result of this invention it will be noted that improved feeding means for a drilling appar-atus have been provided. The connection of the rotor of the feed motor in threaded engagement with the feed screw makes a very compact arrangement that is particularly adapted for feeding the drilling apparatus relative to the work. Other advantages of the invention will be apparent to those skilled in the art.

While there are in this application specifically described one form and a modification thereof which the invention may assume in practice, it will be understood that this form and modification of the same are shown for purposes of illustration and that-the invention may be further modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a. drilling apparatus, a drilling motor of the rotary type, means for supporting and guiding said drilling motor for movement relative to its work, and means for feeding said drilling motor along said supporting and guiding means, said feeding means including a feed screw extending longitudinally of said supporting and guiding means, a fluid actuated feeding motor fixed with respect to said drilling motor as regards relative longitudinal movement and having a rotatable member directly subjected to the action of an operating fluid and threadedly engaging said 'feed screw, means for supplying operating fluid to said feeding motor, and meansresponsive to the torque load on said drilling motor for controlling .the supply of operating fluid to said feeding motor. 2. In a. drilling apparatus, a drilling motor of the rotary type, means for supporting andguiding said drilling motor for movement relative to its work, and means for feeding said drilling mo. tor along said supporting and guiding means said feeding means including a hydraulic feeding motor having a rotor to which an operating liquid is supplied under pressure, a feed element extending axiallythrough said rotor and operatively engaging the latter, means for supplying an operating liquidto said feeding motor, and means responsive to the torque load on said drillingmotor for controlling the supply of liquidto saidfeeding motor. V i

3. In a drilling apparatus, a drillingmotor, of the rotary type, means for supporting and guiding said drilling motor for movement relative-to its work, and means for feeding SaiddrillingmD tor along said supporting and guiding means,.said feeding means including a feeding motor more-- able bodily with said drilling motor and having a fluid actuated rotor, a feed screw extending axially through said rotor and in threadediengagement with the latter, means for rotating said feed screw to regulate the feeding of said drillingmotor during the operation of said feeding motor, means for supplying operating fluid to said feeding motor, and means responsive to the torque load on said drilling motor for controlling the supply of fluid to said feeding motor.

4. In a drilling apparatus, the combination comprising a drilling motor for rotating a, drill bit, means for supporting andguiding said drilling motor for movement relative'to its work, means for feeding said drilling motor along said supporting and guiding means, said feeding means including a fluid actuated motor having a rotor subjected directly to the action of an operating fluid, a rotatable feed element extending axially through said rotor and operatively en gaging the latter, said rotor and said feed element operating to effect feeding of said drilling motor on relative rotation therebetweemmeans for controlling the rotation of said feed element, and means responsive to the torque loads on said drilling motor for controlling the supply of operating fluid to said feeding motor. 7

5. In a drilling apparatus, the combination comprising a drilling motor'for rotating a drill bit, means for supporting and guiding said drilling motor for movement relative to its w ork, means for feeding said drilling motor along said supporting and guiding means, said feeding means including ahydraulic motor having a rotor subjected directly to the action of an operating liquid, a feed screw rotatably supported by said supporting and guiding means and extend.- ing axially through said rotor and in threaded engagement with the latter, manually operated means for rotating said feed screw, and means responsive to the torque loads On said drilling motor for controlling the supply of operating liquid to said feeding motor, said last mentioned means operative at a predetermined maximum load for cutting off the supply of operating liquid to said feeding motor.

6. In a drilling apparatus, the combination comprising a drilling motor for rotating a drill bit, said motor including an element which provides the reaction necessaryfor the rotation of said drill bit, a motor support on which said motor element is mounted for limited rotation relative to said support and is normally held against said relative rotation but is adapted when said motor is overloaded to move relative to-said support, feeding means for effecting feed of a drill bit rotated by said drilling motor, 'saidfeeding 10 the supply of operating fluid to said fluid actuated feeding motor, said last mentioned means being actuated by said motor element upon rotation thereof relative to said motor support.

' WIN W. PAGET.

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