US2210532A

US2210532A - Rock drill

Info

Publication number: US2210532A
Application number: US299233A
Authority: US
Inventors: Feucht Albert
Original assignee: Cleveland Rock Drill Co
Current assignee: Cleveland Rock Drill Co
Priority date: 1939-10-13
Filing date: 1939-10-13
Publication date: 1940-08-06
Anticipated expiration: 1957-08-06

Description

Aug. 6, 1940.

A. FEUCHT 2.210532 ROCK DRILL Filed 001;. 13, 1959 2 Sheets-Sheet l M w M 27 78 I LA I II lNVENTOR ALBERT PEI/CH7 BY n ATTORNEY Aug. 6, 1940.

A. FEUCHT 2.210.532

ROCK DRILL 2 Sheets-Sheet 2 Filed Oct. 15, 1-939 lNVENTOR ALBERT FEUCHT W v ATTORNEY Patented Aug. 6, 1940 UNITED STATES PATENT OFFICE ROCK DRILL Application October 13,

8 Claims.

This invention relates broadly to percussive machines, but more particularly to fluid actuated drilling apparatus of the stoper type.

One object of this invention is to improve the present mechanism for feeding and holding the drill to the work.

Another object of this invention. is to provide the fluid actuated feeding mechanism of a stoper with 'an improved recoil checking mechanism preventing recoil movement of the drilling motor relative to the work during normal drilling operations.

Another object of this invention is to provide the fluid actuated feeding mechanism of a rock drill with a device calculated to maintain the drilling tool to the work irrespective of variations in the pressure of the motive fluid actuating the feeding mechanism.

Another object of this invention is the provision in a fluid actuated feeding mechanism for a rock drilling motor of a recoil checking mechanism which may be released by the simple manipulation of the main throttle normally controlling the admission of motive fluid to the drill motor.

Other objects and advantages more or less ancillary to the foregoing reside in the specific construction and aggroupment' of the elements peculiar to this structure, as'will become apparent from a more complete examination of this specification.

' In the drawings:

Fig. 1 is a side elevational view of a stoper embodying the invention.

35 Fig. 2 is a longitudinal view of the improved feeding mechanism incorporated in the stoper shown in Fig. 1.

Fig. 3 is a cross sectional view taken indicated by line 3-3 in Fig. 2.

4 Figs. 4, 5, 6 and '7 are cross sectional views taken in a plane indicated by line 4-4 in Fig. 2,

illustrating the throttle valve in different positions.

Figs. 8,9, 10 and 11 are cross sectional views of the throttle valve taken in a plane indicated ,by line 88 in Fig. 2, illustrating the throttle valve in the same positions as shown in Figs. 4, 5, 6 and '7 respectively.

Figs. 12, 13, 14 and 15 are alsocross sectional 0 views of the throttle valve taken in a plane indicated by line |2|2 in Fig. 2 illustrating the throttle valve in the same positions as shown in Figs. 4, 5, 6 and 7 respectively.

, Fig. 16 is an enlarged portion in section of the recoil checking mechanism shown in Fig. 2.

in a plane 1939, Serial No. 299,233

Fig. 17 is a view similar to Fig. 16 illustrating the recoil checking mechanism in inoperative position.

Fig. 18 is a cross sectional view taken in a plane indicated by line l8--l8 in Fig. 2. 6

Fig. 19 is a longitudinal sectional view taken in a plane indicated by line Ill-l9 in Fig. 2.

Fig. 20 is a longitudinal sectional view of the central portion of the drilling motor taken in a plane indicated by line 20-20 in Fig. 1.

Fig. 21 is a longitudinal sectional view of the handle also shown in Fig. 1.

Fig. 22 is a view similar to Fig. 20 illustrating a. modification of the invention.

Referring to the drawings, 25 represents the 15 cylinder of the drilling motor within which is reciprocably mounted a piston (not shown) capable of delivering impacts on a drill steel 26 slidably mounted within a chuck 21, which is rotatably mounted within a front housing 28. Mounted coaxially with the cylinder 25, there is a head 29 against which rests the flange 30 of a feed cylinder or housing 3! depending from the cylinder 25 in coaxial relation therewith. The front housing 28, head 29 and flange 30 are 5 rigidly secured to the cylinder 25 by two side bolts 32.

Slidably mounted within the feed cylinder 3|, there is a piston cylinder 33 closed at its lower end We plug 34 carrying a removable ground engaging pointed end 35. On the inner end, the piston cylinder 33 carries a piston 36 equipped with packing rings 31 in fluid tight slidable engagement with the inner wall of the feed housing 3|. This piston rests on an annular shoulder .35 33 formed on the cylinder 3| and is held in position by a retaining nut 39. The cylinder 33 is formed with a buttless internal screw thread 40 having a straight face 4i and an outwardly inclined face 42, the thread being of an angle of about two to three degrees, thereby actually producing the equivalent of annular ratchet teeth formed .on the inner wall of the piston cylin-' der 33. i

Depending from the head 29 into the piston cylinder 33, there is, an inner tube 43 slidably mounted within the piston cylinder 33. This inner tube is closed at its lower end by a plug 44 formed with an arcuated seat 45 extending laterally therethrough and within which is swingably mounted the trunnion 46 of a pawl 41 depending therefrom and having a semicircular wedgeshaped operating edge 48 engageable with the flat face 4! of the teeth or threads 4, as clearly shown in Fig. 16. At a place diametrically opposed to the operating edge of the pawl 41, the plug M is provided with adepending lug 49 against which rests a spring pressed plunger 5!] radially carried by the pawl 41 for constantly urging the pawl in engagement with the thread Intermediate its ends, the trunnion 46 of the pawl all is provided with a slot 5| formed with an inclined bottom wall 52 leading toward the operating edge 68 of the pawl.

Within the flange 30, there is provided chamber closed at its upper end by the head '5 of a gland 55 screwed within the adjacent portion of the head 29, which gland holds in position a water tube 56 through which cleansing fluid is admitted to the free end of the drill steel Slidably mounted within the chamber 53, there is the cylindrical head 51 of a rod 58, which extends into the inner tube 43 for end engagement with the bottom wall 52 of the slot El provided in the pawl 41. Interposed between the head of the rod 58 and the gland 55, there is a compression spring 59 constantly urgingthe rod 53 downwardly, while the chamber 53 above the head is constantly vented to the atmosphere no AQU- through a port 75.

Formed on the head 29, there is a laterally projecting boss [it within which is rotatably mounted a throttle valve 6i having a shank 62 extending through one end of the boss to receive an operating handle 53. Swivelly mounted within the other end of the boss 62, there is a motive fluid connection fi l through which motive fluid may be admitted into a central bore 65 provided in the throttle valve 6 I. Toward its shanked end, the peripheral wall of the throttle valve 6| is provided with a semicircular groove 66 capable of communication with a vent 61 leading from the. valve to the atmosphere and with a port 58 leading in the bottom of the chamber 53 within which is slidably mounted the head 57 of the rod 58. Within the same vertical plane of the, annular groove 36, the throttle valve is also pro-, vided with a radial port 69.

Longitudinally spaced from the groove 66, the valve BI is also provided with an enlarged radial, port ll) of V-shaped cross section capable of communication with a passage leading into the, cylinder 25, and in the same vertical plane with a semicircular groove "H From this groove leads a longitudinally extending groove l2 ending within a vertical plane adjacent the inner end of, the throttle valve and capable of communication with a port '52 leading in the upper end of the feed housing 3|. Within the last named vertical plane, the throttle valve is also provided with a semicircular groove 73 in constant communication with the valve bore 6! through a port it.

In Fig. there is shown the usual feed release port 76 leading from the upper end of the feed cylinder 3! to the shank T! of a handle l8 extending laterally from the cylinder in the usual manner. This port 56 is normally controlled by. a spring seated valve 19 movable into open posi-. tion by a slidable rod 80 operable through a hand operated cam 81. When the valve l9 opens, as shown in Fig. 21, motive fluid from the feed cylinder may exhaust to the atmosphere through an exhaust port 82.

In Fig. 22, there is shown a modification of the invention including a port 83 connecting the bottom of the chamber 53 with the upper end of the feed cylinder 3|, the purpose of which will be explained later.

In the operation of the device, with the throttle valve as shown in Figs. 4, 8 and 12, the motive fluid admitted into the bore 65 of the throttle valve through the connection 64 is prevented from flowing into the machine and the feeding mechanism, thereby preventing operation of the drilling apparatus. As the throttle is rotated from, the position shown in Fig. 12 to that in Fig. 13, motive fluid from the throttle valve bore 65 ad-. mitted into the valve groove 13 through the port, It, will flow into the upper end of the feed cylinder 3i through the port 72, thereby acting on. the piston 36 causing feeding motion of the drilling motor toward the Work. In this instance, it will be noticed that the inlet port 10 is stilt spaced from the port it, thereby enabling feed ing of the drill without admitting motive fluid into the drilling motor 25. In this last position of the valve, its inlet port 69 in Fig. 5, is still spaced from the supply port 63 to the bottom ot the chamber 53, thereby causing the rod 58 to assume a downward extreme position relative to, the inner tube 43 and consequently exerting pres-. sure on the inclined bottom wall 52 of the pawls slot as for maintaining the pawl 47 out of engagement with the threads 40. I

As the throttle valve is rotated from the posi tion shown in Fig. 13 to that in Fig. 14, motive fluid is still supplied to the feed cylinder 3| through the valve groove 13 and supply port 12, In this new position of the throttle valve, the

narrow portion of the V-shaped inlet passage 10,

is in communication with the port if! for admit-. ting a limited amount of motive fluid to the cyla inder 25 for eifecting reciprocation of the hammer in a manner calculated to deliver light im-,

pacts to the drill steel 23, a condition which has been found desirable when starting the drill hole, In this position of the throttle valve, it will be seen that the valve port 69 is still in spaced rela-. tion with the supply port 68, thereby enabling the rod 58 to remain in operative engagement with the pawl 4 for holding it in inoperative position.

After the throttle valve has been rotated into full operative position as shown in Figs. 7, 11.

and 15, the supply of the motive fluid to the feed cylinder still takes place through the valvegroove l3 and port 12. In this instance, the valve supply passage IB is in full communication with the passage '10, while the valve port 69 is now in, communication with the supply port :68, thereby admitting motive fluid to the bottom of the chamber 53 to act under the head 5'! of the rod 58 for, moving the rod and head into the position shown in Fig. 2 against the effect of the compression, spring 59, consequently enabling the spring, pressed plunger to move the pawl 4'! into opera ative engagement with the ratchet teeth 4B. As the drilling operation proceeds, the drilling motor 25 together with the inner tube 43 and conse-r quently with the pawl 4i will move upwardly rela tive to the piston tube 33. In this instance, the,

pawl 38 pressed by the spring pressed plunger will simply ride the ratchet teeth ll] andsuccessively engage the flat faces 4! thereof to pre-' vent recoil movement of the drilling motor relative to the feed piston 33, thereby maintaining the drill steel 26 in engagement with the Work and preventing up and down motion of the drilling motor.

When it is desired to release or disengage the recoil checking mechanism, the operator may move the throttle valve 6! into any of the positions shown in Figs. 4 to 6, in which instance the supply port 68 leading from the bottom of the chamber 53 is put in communication with the atmosphere through the vent or exhaust port'tl,

thereby relieving the pressure under the head 51 of the rod 58 and enabling the compression spring 59 to drive the rod downwardly for causing the disengagement of the pawl 41 with the ratchet teeth in as clearly shown in Fig. 17.

In the modification shown in Fig. 22, the ports and passages shown in Figs. 4 to 7 inclusive may be omitted. this instance, the bottom of the chamber a. is in direct communication with the upper end of the feed cylinder 3i through the port 83, thereby causing the rod 58 to assume the'position shown in Fig. 16 as soon as motive fluid is admitted into the air feed cylinder, that is, in any position of the throttle valve shown in Figs. 13 to 15, and consequently enabling the operative engagement .of the pawl ll with the ratchet teeth 46. In this instance, the disengagement of the pawl will take place when the motive fluid pressure is released from the feed cylinder 3! by the operator actuating the cam 85 for opening the valve it, thereby enabling free exhaust of the motive fluid via the port it, the now opened valve is and the exhaust port 82, and resulting in a drop of pressure in the chamber 53 permitting the spring ES to drive the rod 58 downwardly to cause the-disengagement of the pawl M.

Although the foregoing description is necessarily of a detailed character, in order to completeiy set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modifications of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. In a drilling apparatus, the combination with a drilling motor, of a feeding mechanism for said motor including feed housing fixed to the motor, a fluid actuated piston cylinder tele-v scopically mounted in said housing, of an inner tube in said cylinder fixed to said motor, longitudinally spaced teeth on the inner wall of said cylinder, a pawl pivotally carried by the inner end of said tube for operative engagement with said teeth to prevent recoil movement of the motor relative to said cylinder, and a rod slidable in said tube engageable with said pawl for effecting its disengagement from said teeth to permit the collapse of said feeding mechanism.

2. In a drilling apparatus, the combination with a drilling motor, of a feeding mechanism for said motor including a feed housing fixed to the motor, a fluid actuated piston cylinder telescopically mounted in said housing, of an inner tube in said cylinder fixed to said motor, longitudinally spaced teeth on the inner wall of said cylinder, a pawl pivotally carried by the inner end of said tube for operative engagement with said teeth to prevent recoil movement of the motor relative to said cylinder, and means in said tube operatively engageable with said pawl for eflecting its disengagement from said teeth to permt the collapse of said feeding mechanism.

3.111 a drilling apparatus, the combination with a drilling motor, of a feeding mechanism for said motor including a feed housing fixed to the motor, a fluid actuated piston cylinder telescopically mounted in said housing, a throttle valve for controlling admission .of the motive fluid to said piston cylinder, of an inner tube in said cylinder fixed to said motor, longitudinally spaced teeth on the inner wall of said cylinder, a pawl pivotally carried by the inner end of said tube for operative engagement with said teeth to prevent recoil movement of the motor relative to said cylinder, a rod slidable in. said tube engageable with said pawl for effecting its disengagement from said teeth to permit the collapse of said feeding mechanism, and means including said throttle valve for controlling the slidable movement of said rod.

4. In a drilling apparatus, the combination with'a drilling motor, of a feeding mechanism for said motor including a, feed housing fixed to the motor, a fluid actuated piston-cylinder telescopically mounted in said housing, of a recoil checking mechanism comprising a tube in said cylinder fixed to said motor, longitudinally spaced teeth on the inner wall of said cylinder, a pawl carried by said tube operatively engag ing said teeth, and means effecting disengagement of said pawl from said teeth.

5. In a drilling apparatus, the combination with a drilling motor, of a fluid actuated feeding and supporting mechanism for said motor including a feed housing fixed to the motor having a piston-cylinder telescopically mounted therein, a throttle valve for controlling admission of motive fluid to said mechanism, of a recoil checking device between said motor and cylinder, a slidable rod in said housing operatively associated with said device for rendering it inoperative, and means including said throttle valve for controlling slidable movement of said rod.

6. In a support for a drilling motor, a pair of telescopically mounted elements, means including a throttle valve for admitting motive fluid in the outer element for effecting the extension stroke of said elements, a releasable lock between said elements normally preventing the compression stroke thereof, and means controlled by said throttle valve for effecting the release of said lock.

'7. In a support for a drilling motor, a pair of telescopically mounted elements, means including a throttle valve for admitting motive fluid to said elements for effecting the extension stroke thereof, a releasable lock between said elements normally preventing the compression stroke thereof, a slidable rod operatively engageable with said lock for efiecting its release, and means including said throttle valve for controlling the slidable movement of said rod.

8. In a support for a drilling motor, a pair of ALBERT FEUCHT.