US1684888A

US1684888A - Drilling mechanism

Info

Publication number: US1684888A
Application number: US699111A
Authority: US
Inventors: Thore R E Rundqvist
Original assignee: Sullivan Machinery Co
Current assignee: Sullivan Machinery Co
Priority date: 1924-03-13
Filing date: 1924-03-13
Publication date: 1928-09-18
Anticipated expiration: 1945-09-18

Description

Sept. 18, 1928.

T. R. E. RUNDQVIST DRILLING MECHANISM Filed March 13, 1924 4 R. @CMM sv .su

Cil

Patented Sept. 18, 1928i.

vUNITED STATES PATENT OFFICE.

THORE R. E. RUNDQVIST, 0F CLAREMONT, NEW HAMPSHIRE, ASSIGNOBl TO SULLIVAN MACHINERY COMPANY, A CORPORATION 0F MASSACHUSETTS.

DRILLING MECHANISM.

Application led March 13, 1924. Serial No. 699,111. A'

I'lhis invention relates tov drilling mechanisms.

It has for its object to provide an improved drilling mechanism. A further object is to provide a drilling mechanism having an improved feeding means with improved means [or controlling the flow of fluid to the feeding mechanism. A further object is to provide improved feed control means particularly adapted for a spotting operation. It is a further object to provide an improved feed control mechanism that will automatically hold the drilling mechanism'in substantially a stationary or balanced condition. It is a further object of my invention to provide such a controlling means for the feeding mechanism which employs a piston having differential areas so that the forward feeding force will be just sufficient tozhold the steel in a spotting positionl against the recoil of the drilling motor.

Y In the accompanying drawings I have shown for purposes of illustration one form which my invention may assume in practice.

In these drawings,-

Fig. 1 is a side elevation partially broken away to show details of construction.

Fig. 2 is a diagrammatic view of my improved control means for substantially balancing the feed.

Fig. 3 is a transverse vertical sectional view taken substantially on line 3-3 of Fig. 1.

Fig. 4 is a detail sectional view of the valve 30 shown in Fig. 2 with the valve in a different position.

Fig. 5 is a detail sectional view of the control valve 10 illustrating the connection of the forward and reverse feeding passages.

In the illustrative form of my invention it is shown as embodied in a drifter type of drill comprising a combined feed cylinder and support 1 having a depending member 2 adapted to be engaged by any suitable support and having longitudinal guideways 3 disposed on the upper side thereof Within which is slidably mounted a drilling mechanism 4. This mechanism comprises a usual percussive motor cylinder 6 having a. chuck housing 7 mounted thereon and adapted to carry a Steel 8 while a4 rear cylinder head 9 carries a usual pressure fluid control valve 10 having communication with a main fluid passage 11 leading to a fluid distribution valve 12 for the motor 6v.'v

The feeding mechanism of my improved device comprises an arm 13 projecting rearwardly from the lower side ofthe head 9 and terminating in'depending members 1'4 and 15 which carry at their lower. -end a. boss 16 having a conical bore 17 within which a plug 18 `is disposed and held therein 'by a nut 19. 'lfhreadedly connected to reduced portion 20of the plugf18` is'ahollow'piston lrod 21 projecting fc rwardly t'hou' h a combined rearv cylinderfhead and packing member 22. Mounted upon the forward end of the rod 21 is a .piston 23 held thereto as by a hollow nut 24. Also. carried by the member 18 is a fluid conducting tube 26 whichprojects forwardly fromja chamber 27 and terminates. in 4a head 28 adjacent. thenut 24."

In order that the drilling mechanism 4 may be held to its spotting position independently of the main control valve 10, I have provided the following mechanism comprising a balancing valve 29 controlled by'a manual valve 30. The objectv of the balancing valve is to substantially equalize the rearward and forward feeding forces so that the feeding mechanism may, according to the proportions given my balancing valve, either be held in a complete balanced condition or given a slight forward feeding force just sufficient to overcome the recoil of the hammer piston disposed within the cylinder 6 and thereby hold the steel in spotting position at the working face. My improved balancing valve, also must have embodied therein means for not only balancing the fluid pressure'forces acting on the pressure areas of the feed piston, but also balancing the weight of the drilling mechanism when the same is disposed in an inclined position. More specifically', this valve comprises an enlarged central portion 31 disposed in a bore 32 andhaving outwardly projeeting

piston members

33 and 34 reciprocably mounted withinbores 35 and 36 respectively. Said central portion has spaced

annular grooves

37 and 38 communicating respectively with the bores 35 and 36 as by

passages

39 and 40 in the valve 29, while passages 41 and 42 and small vent ports 41 and 42a allow communication between the bores 35 and its for wird2 p'ositn, live pressure fiiiid is admitted to the fr''iitff piston 23 as by: apas-A sage 43 leading from the main valve l0, an annular groove 44 formed on thep'eiiphe'ry of the valve 30, a passage 4 5, groove4 3T, passage 39 to the. `bore 35, outa 'passagean a'niiikilarYroovefalso formed on theperiphery of t4 eval e30, tli'rough'a' pziss'ige'etS and 'i groove formed the'valv'eBO intermediate the; s 44; and- 47, 'passage 5I leading t'oi the hollow bore o f pisto'ni'rd I2 1 port 52 foi thefrear -sidel of. the Apiston 23. 1t will liliribe'Ii'Qt'edithatA Wliiithe 'Valve 29 ,is in a position opposite from that slioivn' in'Figf2 the here fof the .cylinder attlie front side of the piston is ventedlto, atmosphere byfvaypf passages 48 and 4 6,- -groove 37 thevalve29, and exhz'rii'stl passaf ie `42 `In order 'to allow free n'iovelrient off the valve 29 botliiendsA f bore 32am vented' to atmosphere as bythe 41a l and 42" eoininu'riieatii'icr \\'i th l'the exhaust passzrges 4l and A2, resp'el ely This position of the valX-*e 30is maintained by the operator merely pressingv the button 54 against the'tension Vofa spring It )vill lie stated: heretliat inasiniieli'as-it is' the prirposeoffthe balancing valve 2S) to `maintain substantially'eqiial' forces on each side' of 'the piston 23, the effective pressure areas oi'itlie 'ends of the pils-tons 33, 3ft having the saine proportion to theiveight of this valve as the Correspondingpressure areason the Afeed pist0n 23 have to the 'Weight of the tool'actiiatimg motor and the parts ot the meehan'ism movable therewith.

*Inthe operation of the device thus fardeseribed. ifitis desired to spot the hole, tlie vaflveBO will be pushed to the position shown in 'Fig'..2in vvhich ease pressure fluid will flow from the controlvalve 10 through thepassige 4 5' to the end of bore and to the torivard side of pistori23 and When the pressure on that side of the piston builds up, say to a pressure less thanV line pressure. this pressure'acting upon the forward effective area of the piston 23 Will throiv valve 29 to itsolther position. Said hore 35 is then' immediately vented to the atmosphere th rough groove 37 in the valve 29 and exhaust passage 42, but the' passage 4G is of sutlieient length to take a considerable time to wholly relieve the pressure in front of the piston 23 and, as will bepresently seen, the valve 29 travelsfastenough so that a substantially constant pressure will be niain tained in the feed cylinder atall times. It vill' bel -un'derstood thatlt-'lie"ielativelyslig'lit iitietiiati'n ot thev`v valve r29," here-iii' between the liinits of 5th to ygth of an inch, has no ina- `"terz'il zrf'e'et" on the pressure in the feed cylpressure flu idl through" 45,;xt0 the annular groove 37 fthe val ve"29 and will also eut off Apass agg-*es 46faiid49 ledd'in'g' 'to the ends of pistons 33aiid thi-'is wholly et'ittiigo'iit the operation ot said balancing valve,-

iiular-rrooves' 47`ai'id'50 formed in the periph-` civsja'rieeof me piston 3i vice EWill be apparent-from' the foregoing de'- scription in conneetienwvitlhthe balancing improved balancing valve the operator needs only to pressi-the button 54 whereby" the feed Or'tl-iedrilfling 'mechanism ivil'l be suitable' for'sp'otting conditions and=does notrequire the operator' to Iirstftlu'ov: 'the' mai-n controlf valve rn one direction to obtain a fmfivard'v feedfandthen in the reversev direction to obtain a reverse'feedlin order to counteract-the full forward feeding,y force. 'Vhentlie}drill is in anj inclined position I'there will begaf tendency'-for-tlie drill dueto its'weight-'to sllde fbackor foi. ivai'd, depending uponf-the direction' ofinlination v'of' theV drillf. This* necessitates: a greater pressure on'- the-side of the piston, in which direction Athe 'mechanism tends'fto'lslide, t'o'hold the drill -in` a balanced conditi-oni: This is accomplishedby making the Weight'of the valve 29 in proportion to the' weigh'to'f the inovalilezpartofthe drilling 'mechanism'. If the drill' is inclined the 'presl sure; on the vsmall area 3ft-necessary to move" the-valve 29i'ivill antomatically `be--increased' for'gt'lie'valve will Tema-iii in its lower` posi'- tion-uriti'l the' pressure builds up in the feed' cylinder; i' O'f Acourse during this operation' the rangeo'f pressure at the 'ends of thevalve 29 -issiich1 thatiline pressure is ne'\-'er-attained thereby leaving an excess pressure to'be used when ltl`1e"".lr ill isf inclined- T'Vhill have in this-application'specifically' modied ndernhodied invarious other forms withoutdeparting l of the appended claims.

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

r from its spirit or the scope 1. A. drill mechanism comprising a tool actuating motor.v feeding means therefor includingl relatively movable elements, means including a valve to subject one of said ele ments to opposing fluid pressure created forces .for automatically maintaining said feeding means in a substantially balanced condition, said valve moving oppositcly automatically in accordance with variations in said forces to control the supplies of fluid which produce said forces, and means including a valve operable at the will of the operator for controlling said automatic means.

2. A drill mechanism comprising a tool actuating motor, feeding means therefor including relatively movable elements`r means including a valve to subject one of said ele- 'tions in' said cyli nder,i titel pressure lare-.asini -said Ivalve yhaving thj'eJ 'sameproportintd t I' pressure areas on' said'lpi'sto'have tli ments to opposing. fluidi-pressure created forces for automatically maintaining saldi feeding means in a substantialliy balanced condition to reduce- -th'ewonlrperforxnance'-` thereof', said v-a'lve fmoizing 'oppsi't'ely auto; 57o? matically in accordance 'i'vitll variations' in vSaid forces to @entrambe suppliesior fluid:

inga valveoperable -to Tender said'atoil'ialic' means inoperative to 'allow said feedingm'eans; 73" to normally operate.A i3: `A drilli 'mech`anism comprising. a tol actuating motor, pressure fluid actuated 'feed' ing .means therefon comprising' la feed cylinton= having. di erential'pr'essure areas, andiw means including a valveArespensive'toI presi-'j sure conditions' Wflthirr said feed'eylmderiandl havingpressure 2. areas proportionai to! said vdi lferentiial' piston i areas for.; controllingfi the; 'S355A flow lof fluid to said -Ifee'd cylinder'. i

A Idrinnuechani'smcomprising i jimi: actuating imotorg p res'sunel fluid actuated "fe'ed'l t Y ing vmeans therefor comprising a; feed cylinder-- and al feed pistonfthere saidi'f'ee'd pi'ston9W having differential pressu' l aleals'gfandmeansfor controlling-flnidflivtlszidcyllndei cludinga' valve responsive to pressure condi-"- weight yof saidfi valvefas the'. 'cor-iespend' Weight of said.'tool'factliztiii'ginotoriid the" p arts of the mechanism 2 movable-therewith.

5. A drill mechanism co'm'p'ri''sil'igi-al*tooli100:;4

actuatingr moto'r,pressurefflu-idtetatd ffe'ed ing means therefor' comprisinga fe'edcylinderand a feed: :piston -therein,-s aid piston having-f.' d itl' e rential pressure areas, and iniiris -in'el'u'di ing a valve responsivetopressur cond-itin i with-in saidv feed cylinder'an'd i'ifavin'gpress'i'ireAA areas proportionalto' sa-iddiflerentia-l pistonareas for-controlling flowof==flhid to said cylinder to Vau'tomaticallyl maitain-si-b'st'ar# tillj.j equal opposing"freesthereon.-

(i. A drill mechanism comprising-vv work performing means for actuating a drill steel, pressure fluid actuated forward and reverse feeding means therefor including a piston, and means comprising a directly fluid actuated valve operable independently of said piston and responsive to pressure changes in said feeding means for automatically maintaining said feeding means in a substantially balanced condition during spotting of a hole.

7. A drill mechanism comprising a motor for actuating a drill steel, pressure fluid actuated feeding means therefor including a feed piston having opposed differential pressure areas, and means comprising a valve responsive to pressure conditions in said feeding means and having opposed differential pressure areas proportional to the areas of said piston, said means being effective for automatically maintaining said feeding means in a substantially balanced condition.

8. In a drill mechanism comprising work performing means, pressure fiuid actuated feeding means therefor comprising a cylinder and a cooperatin,f Y piston, and means independent of said piston and responsive to pressure changes in the ends of said cylinder at opposite sides of said piston for automati-- for actuating a drill steel, pressure fluid actuated feeding means therefor including a piston, a main throttle valve for controlling said motor and feeding means, means comprising a directly fluid actuated valve independent of said piston -and responsive to' pressure changes in said feeding means for automatically maintaining said feeding means in a substantially balanced condition, and manually operable valve means for con trolling the fluid flow between said main valve and said automatic valve.

11. A drill mechanism comprising a inotor for actuating a drill-steel, pressure fluid actuated feeding means therefor including a piston, a main throttle valve for controlling said motor and feeding means, means comprising a directly-fluid actuated valve independent of said piston and responsive to pressure. changes in said feeding means for automatically maintaining said feeding means in a substantially balanced condition, and manually operable v alve means to cut out said automatic means during normal feeding of the motor.

12. A drill mechanism comprising a inotor, pressure fluid actuated feeding meansing means in a substantially balanced condition.

13. A drill mechanism comprising a tool actuating motor,.pressure fluid actuated feedif ing means therefor comprising a feed cylinder and a feed piston therein, said'feed piston having differential pressure areas, and means for maintaining said feeding means iii a substantially balanced condition including a valve responsive to pressureA conditions in;V

said cylinder, thepressure areas on said valve having the same proportion to the weight of said valve as the corresponding pressure areas on said piston have to the jweight of said tool vactuating motor and the parts of the ymechanism movable therewith.

14. A drill mechanism kcomprising Work performing means, pressure fluid actuated; feeding means thereforcomprising a cylinder and a cooperating piston, and means comprising a valve responsiveto pressure changes in said feeding means for automatically alternately connecting the ends of said cylin-I der atopposite sides of said piston to suply and exhaust for maintaining said fee ing means .in a substantially balanced' condition. l5. A drill mechanism comprising vwork performing means, pressure fluid actuatedI feeding means therefor including a piston,

and means comprising a valve independent of said piston and having opposed differential pressure areas subjected lto pressure changes in said feeding means for automatically maintaining said feeding means in a substantially balanced condition.

In testimony whereof I affix my signature.

TiioaE a. E. RUNDQvisT.