US2611219A - Work blasting equipment - Google Patents

Description

' W. l. GLADFELTER WORK BLASTING EQUIPMENT Sept. 23, 1952 8 Sheets-Sheet l Filed May 26, 1951 IN V EN TOR.

W G H w. 1, W

W, fw /4777-0/P/VEY-.5

Sept. 23, 1952 w. l. GLADFELTER 2,611,219

WORK BLASTING EQUIPMENT Filed May 26, 1951 8 Sheets-Sheet 2 INVENTOR.

W/L 77511 GMFELTEI?,

My fu/ SeptfZS, 1952 w. l. GLADFELTER y.2,611,219

WORK BLASTING EQUIPMENT Filed May 26, 1951 8 sheets-sheet s Sept. 23, 1952 w. l. GLADFELTER 2,611,219

WORK BLASTING EQUIPMENT Filed May 26, 1951 8 Sheets-Sheet 4 M4. 775.1: GLOFEL 7m Sept, 23, 1952 w. l. GLADFELTER 2,611,219

WORK BLASTING EQUIPMENT Filed May 26, 1951 8 Sheets-Sheet 5 /f i INVENTOR. l n//LT/EJIGMDFELTER,

Sept. 23, 1952 w. l. GLADFELTER 2,611,219

WORK BLASTING EQUIPMENT iled May 26, 1951 8 sheets-sheet e Sept. 23, 1952 w. l. GLADFELTER 2,611,219

woRx BLASTING EQUIPMENT v Filed May 26, 1951 8 Sheets-Sheet 7 S-ept. 23, 1952 w. l. GLADFELTER 2,611,219

WORK BLASTING EQUIPMENT Filed May 2e, 1951 s sheets-sheet 8 51 l l/v vE/vro/a WILT/E 1'. GLAUFELTER, Y

B l j HIS TTORN Patented Sept. 23, 1952 WORK BLAs'rING EQUIPMENT v 4 Wiltie I. Gladfelter, Hagerstown, Md., assignerl to Pangborn Corporation, Hagerstown, Md., a corporation of Maryland 'Application May 26, 1951, serial Nb. .228,501`

20 Claims. (Cl. 51-8) This invention relates to work blasting equipment and more especially to blasting rooms for cleaning of castings and the like, and aims generally to improve the same. The present application is in part a continuation of prior application, Serial No. 141,315, filed January 30, 1950, and now abandoned.

The invention is particularly, but not exclusively. applicable to core knockout rooms in which a jet of water, or preferably of water and abradant, is employed to break down and blast away molding cores used in the founding of large hollow castings, as well as to clean the dirt and scale from the surface of castings.

In particular it provides flexible means for transporting an orientable blast gun and the operator controlling the same in at least two dimensions to enable blasting of the work from many dierent positions or vantage points.

Particular objects of the invention, severallyl about or toward and from the work; in the provision in such a structure of means controllable by the operator in the car for electing the traverse and for eiecting the blasting operation from any selected position in said traverse; in the provision of stabilizing means particularly in the suspended structures; in the provision of novel and effective access means for use of the operator; and in the provision of various new and useful features, arrangements, and sub-combinations thereof contributing to the attainment of the aforesaid main objects.

The invention resides in the new features, combinations, and arrangements of parts hereinafter described with reference to illustrative examples, and is particularly pointed out in the appended claims. y ,Y

In the accompanying drawings of illustrative embodiments of the invention Figs. 1 to 3 are somewhat diagrammatic plan,

' front elevation and side elevation views of one f embodiment;

Figs. 4 to 6 are similar views 0f a second embodiment;

Fig. y9 is a fragmentary viewof Ithe interior. vof the room in the embodiment of Figs. 7 and ;v "n

Fig. 10 is an enlarged detail view'of a portion of the nozzle mechanism in theconstruction ,of Figs. '7, s ande; 1 Fig. 11 is a sectional viewA of the carorfxFigs 8 and 9 taken along `the line Il-"I l', and` Fig. 12 is a plan view similar to Figfgof afluither embodiment of the present invention.

In the hydraulic blasting of castings and the like, it is customary to place the casting inan enclosure andv project upon it a -highpressure stream of water and abradant lfrom nozzles or blast guns carried by operators within theroom. or positioned adjacent to a wall of the enclosure. In the latter case, the direction of projection of each jet gun relative to its mounting has been variable and it has been customary to provide two 'jet guns, one to project a stream generally hori- 20 zontally toward the work, and another located rat a high elevation to project a stream generally downward toward the work. The' provisionof two'guns at different levels has required the inclusion of two operating stations at different angles and with their respective platforms, stairways, piping, valves, etc. with accompanying disadvantages.

A later improvement over the lower and'upp'er stationary operator positions is exemplified in the patent to Keefer No. 2,440,222, in which a section of the blast room wall or enclosure is replaced by a vertically slideable wall section which carries a blast gun. The slideable wall section comprises the inner face of an operators vestibule or car with one high pressure blast gun and controls so that the operator can simultaneously move up and down the sliding wall section and the blast gun and operators car carried thereby, with obvious advantages over the former two level arrangements.

By the present invention still greater flexibility and Vease of operation, and still greater effectiveness of blasting is accomplished, since with the present invention, the gun and operators car are traversable, not simply in one dimensional .E Vdirection, but in two or three dimensions, all under control'of the operator in the car, andthe gun or blasting means `being mounted for at least limited vuniversal movement under direct control ofthe operator, and .without his having to resist the reactive Vthrust thereof,` the combination greatly improves the ability of the operator to quickly and easilyv orient the gun to obtain maximum effectivenessfor core removal or surface blasting .of the work.

. housing 33 (Fig. 2)

kpipe 31.

Ative forces.

`is wound the elevator cable 3|, after the latter 'passes over a conventional supporting and guiding sheave 32, also carried by the wheeled elevator supporting means |6-|8.

The motors and primary drives are protected from water and abradant, herein by mounting' the elements 22, 22a, 23 outside the blasting room and venclosing the elements 28-30 in a suitable As is shown in Figs. 1 and 3, the blast-gun or nozzle can be located somewhat to one side of the center of the door and this door is provided with a vision window of substantial extent. The off-center arrangement of the nozzle facilitates manipulation thereof bythe operator as it places the operating handle I0 more conveniently for an operator viewing the work from a position at the center of the window than would a centered arrangement. i

Still referring to the operators car, as shown in Fig. 3, this car may be equipped with an operators seat 36 and with a window wash off spray The controls available to the operator within the car 6 in general should include manual and/or automatic controls for the supply of liquid to the wash-pipe 31, as well as manual controls for the supply of fluid or abradant or both to the gun 5, for driving turntables or other manipulating supports for the worky to be blasted from the car, and for traversing the car vertically and horizontally as aforesaid. As above mentioned some or all of these controls may be centralized in the electrical control panel v9, the leads from which may be carried in any suitable way, as through one or more commutaf tor ring type cable reels 38 and junction boxes 39 (Fig. 2) to the instrumentalities or appurtenances to be controlled.

Especially in hydraulic blasting for core knockout and the like, heavy reactive forces occur at the nozzle. To resist 'these forces',` the nozzle canbe firmly mounted turretwise on the car 6,-

door is preferably outwardly opening land closes L against a sturdy jamb strip to sustain the reacheld against opening when the nozzleis in operation; In addition suitable stabilizing'meansis provided to prevent swinging of the suspended elevator and gun relative to the trackway, herein shown as a horizontal downwardly opening guide .channel 40 (Figs. l and 3) in which runs guiding means, comprising one or more guide rollers 4I,

suitably braced to the suspended runway frame In the secondA illustrative embodiment of the invention, Figs. 4 to 6. the structure is modified to enable the car 6 and gun v5 to be moved toward and away from the work as well as laterally and horizontally relative thereto.V Forbrevity, some Aof the parts correspondingV generally to those shown in Figs. 1 to 3 are similarly numbered,'and will not be again described in detail.Y In this form of the invention, the elevator runway I8 and parts carried thereby are suspended for sideways movement on the first trackway I5, by wheeled means I6 comprising the rollers 1. In this instance, in lieu of the traversing chain drive 22-23 of Figs. 1-3, one of thesupporting With this construction the door isl 6 wheels meansp|1 is itself motor driven by geared reversing motor 44 power for which is 'controlled inl any suitable way, preferably from control panel 9 in the blasting car 6. g

.The wheeled means'IIi-H in this instance supports a second trackway or rollerway- 45 exy tending vtransversely-of the rst trackway l5.

toreach withvthe blast stream.

and fromwhich issuspended a second Wheeled means V46 having traversing rollers -41- engaging the trackwayl 45. The second wheeled means A4|i- ,is suitably ,traversable on the second,v vtrack-- .,way 45, asby ai geared `head reversible -motor 48, similar to the motor 44 andsimilarly controlled.- ',Theelevator runway I0 is in turn suspended from the second wheeledrrleans 46;.y

The stabilizing-means, to'prevent` swinging of n `vented from tilting relative to the rst trackway.

To prevent the elevator runway` from swinging relative to the wheeled means 46, the stabilizing means further includes stabilizing rollers 53frunning on stabilizing trackways or rollerways 54, and braced to the elevator runway I8, as bysuitable supports 55. Additional bracing 56 (shown in Fig. 6) may be employed if desired, to further rigidify the traversableA structure.

As in the form of` Figs. 1-3, the power leads for the control panel 9 may-be carried in any suitable way to the instrumentalities.. to Ybe controlled,` as exemplified in Fig. 4 by the main power cable 60,- pulleys 6I and cable .reelv 62; the cable 63, reel 64 and pulley 65- forthe horizontal bridge travel motor 44; the cable 66, reel 61 and pulley 68 kfor the horizontal fore-and-aft, or trolley travel motor 48; and thecable .69,.reel 10 and pulley 1| for theelevator drive motor 28.

vWith thisa'rrangement the advantages of the l.structure of Figs. 1 to 3 are realized, and in addition, the -gun car 6 may be moved not only sideways and verticallyrelative to the work, but also to-and-fro relative thereto, which is especially advantageouswhen blasting .veryirregular castings .or castings having deep cavities diflicult 'The construction of Figs. 7 to 11 shows a preferred type of blasting. apparatus exemplifying the present invention. In this kconstruction a track |I5, is generallyU-shaped in plan view and extends along threegenerallyrectangularly disposed walls |0| of a blasting room |02. The fourth `wall is shownas providedby retractable door panels |12 which can be doublehinged for example to fold in either direction as they .are opened to permit the introduction and removal of the work articlesto be blasted.

For convenience in handling the work the` floor |04 of the room is provided with a pairof tracks or rails |13 on which can be mounted a atcar |14 equipped vwith one or more sets of rail-ntting wheel trucks |15. If desired, `vthe -work articles can be directly supported on such trucks Without using an intervening car body.A A blasting car |06 is suspended in avertically extendingframework IIB, and the Vframeworkin turn has rollers I |1 by which it is secured tothe track ||5. Raising andflowerin'g',v mechanism v|28V is shown .as connected to move thecar! |06 verticallyin the framework IIB andsuitablyfad- A'thecar |06 to the desiredfvantage'lpointfor.'blastl"supplyf lines -ias'lwell' as anfairf supply *hose rithat "connectionl'at'the rcenter-'ofthe roomto prevent l *kinking and-#excessive 'ilexing lof these 4-hoses at this-location. second flared 'sheathlflil 'can' 1be lmountedpn car 06 as shown -in'Fig i9 for 'fthe "same "reason `-Additional protection t'for 'the Theses-can ce Aprovided--in'the'forrrrtifi1a'rotatable *boom (not fshown) 'swiveled" adj acent-L collar v 80 sheath- |'8| and having-'af free 'fend' securedto the hoses llftolkeep themfromfsagginglunduly. "nnianti-tilt rail |40,"A againstwhich thei car is journaledas -by rollers lcounteracts vthe blafsting thrust of? the nozzle.

,1A's show-n in -Fig. 9 substantially the 'entire "font'n'f fthel carjl 0 6 can" be in 'the 'form of -a door .''tti-hinged` as'indicatedat |82 and having fa? lock- "ing handle or knob |83. "One Aor'more-'lights|84 in ioimte'd' in a' portion ofthe 'door is'farran'ged4 to "illuminate the 'work 'tovr be "blastedV while' 'trans'- -parent'panelfl 35,"Wlfr'ichcan4 be protect-ed byfbars 'as indicated'iat; A| 85,' acts 'as a'f'vie'win'g 'window'ior "the operator'in the "car: n'Clearing' mechanism .such :fas "the'water spray linesV l|88" are arranged "to washthejsurfaces'of panel-"|-35iand lightsl |84 "toj'keepthem-clear. A

,"'Asindic'atedabova the iloor'fl'il-of the 'blast- "irrgroomA is'prefera'bly 'in the form-'of-agratin'g to permit .abradant'and detritus to4 fallthrough "into "a 'jconvenientlyprovided pit. The detritus can"be;delivered from the'pitfas by means of a hopper outlet, :to Abe discarded.- AInasrnu'ch as a 'considerable amount A-ofj suitable rblastant v'1:arti- '{clesf'such'as"molding'sand is usually contained' in 'orzonthe'work' articles and dropped through vwith ithejdetritusreclaiming structure-'suchsas a sand Vclasslierv can'be 'supplied for receiving "the ma- '.terialscollectingin the pit, removing 'sand partincles offselected'sizennd delivering these selected iparticiemo the "tank ns. Floor #o4 can also be sloped downwardly'toward'rails 13' as "for exjample"'at"about a 10'inclination sothat larger farticlescorerods' and the like,'blasted from the rwrk'articles on'to the iloorwill `collectwhere "theycan be4 easily removed 'either manuallyor with the 'ihelp' -of instruments such Aas v"lifting magnets; j Y

k",Asshcwniin Figs.""and 11,'the'nozzle'i5rcan :advantageously have an extensive'rangeA of unifversallniovement. `For this purpose this form of L thejnventionfhas the 'nozzle `supported bydts .f8 -f1vhereitis journaled on l`rlxed'bearings |89. Shaft |88y isf prevented 1from' appreciable movement'in its :longitudinal direction 'as by 'shouldersynot shown; `cooperating-'with the sides ofthe bearings |811at'1a point spaced vfrom theattachment of A'the 'nozzle 5 in .a manner 'corresponding 'to 'the vmovement of the handle. Y At-the'same time the 4handle |92 can .be deflected .'sideways'so that level" |9| `pivots"aboutsh'alt |88 Tand vcorrespond- '.ingly rotates fthe nozzle.

ForJsealing. the lopenings in the iloonof'carul 06 through which shaft |88- and'rod `|90 move, and

parti'eularlyithe arcuate 'slotV through which 'rod |90 -pivots around; shaft |08, Athe arrangement shown in Fig. 10 is quite effective. `Anouter'rin'g in'gs aand has.' inwardly directed 'flanges l 94. An "inner .ring '|95 fhas spaced r*outwardly :directed :iiian'ges IISG-positioned to :mesh with anges'l,

.position on'shaft' |88. "The cap|9`| is imperforate :except for the passagewaysflthrough which the nir-od |:9 0.1must tmo've. longitudinally. '.A-washeror gasket '1| 99 .snugly "tted around' .rod y|590 'reduces leakagef'a't this` point. 'lThe intermeshed ilanges 9l|'-'andv |396 act -as Aa-'series of baffles-Which-'permit frotationofshaft |88 and '-ro`d'| 90 and at' the-same `blasting room.

For the convenience of the operator. aballast '.2 00 can beiprovided for `controlilever |-9| to aslsure that the nozzley 5 is easilycontrolled notwith- .s'tandingits.powerful-thrust.recoil aswell as the shifting tendencies. of the loopedhoses 'The bal- .lastl200 canbeinthe vform of.anfopen-container in lwhich weights. canbe addedv Yandfrom which Weights` can be ,removed to effect'a fine-,adjustmen-t for .the balancing action. Suitable YWeights are .in the form-of--a small supply 'of sand which f can be-kept within the car 06.

vAieature of the=aboveconstruction isthatfalthough quite Ysimple the trackV v| |5i provides an exceptionally large latitude 'of blastingpositions.

. Furthermore, :this track arrangement :infcombi- -nation with .the'lverticalv adjustment travel'of Vthe car provides a range of blasting positions which -fcoverssubstantiallyzany vantage pointflikely to lbe desirable. Moreover, -the flexible portionsfo'f the? blasting lines, and 'their companion 4flair and electric lines 'Where used, need fonly la `small "amount 4of vadjustment "with respect to span.

In'fgeneral,- the highlydesirable 'blasting of the construction of Figsr to 11 can be provided with blasting rooms that need not be rectangular or square in plan-view. Circular, elliptical or polygonal Aroom outlines are also useable. For best results, the continuous car carryingjtrackway should extend at leastabout 270 around the periphery of the Vroom regardlessof its outline.

Fig. 12 shows an embodiment of the present invention in which a blasting room 202 has an endless oar-holding track 2!5 which extends in a more or less endless manner along' all theside Walls. In this form of the invention the work articles can Abe'held on a stationary'table'Zl forexample andintroduced` and removed as by means of a crane or similar lifting device `-op erating through the top of the chamber. Where it is desired to keep the blasting chamber closed,

the top may have a retractable roof asin'dicatedy by the sliding section -panels 212 which can'be" arranged to slide awa-y from ov'er'thev table 214 and also oi'to one side of the room as indicated at 213. The-blastant and other lines can be introduced as shown atl-280 through a xed portionu of the chambers roof.

As indicated above, vthe endless' track 215 canV be used with blasting chambers having any `convenient plan outline. If desired, auxiliaryV limit switches can be vprovided to keep the blasting car from running along the endless track to an extent that would kink or tangle the lines. For convenience, these *limit switches can be positioned along a portion of the` track to automatically'shut off power tothe track driving mechanism when the-car reaches a desired position from either direction. A small amount of overlap can be provided to reduce the requirement to travel the entire length of track in order'tof a movable roof or by omitting thev roofcom-v pletely. Correspondingly, the endless trackv construction of Fig. l2 can be used with the wall door lloading and unloading features of Fig. 7.

The blasting car guiding mechanism of the present invention need not be mounted overheadv at the top of the room, but can also be provided at lower levels as in the usual form of carcarrying rails. In addition, the blasting car can be directly held on the oor of the blasting room asby 'means of wheels that are no-t located in a track but can roll along the iioor after the manv ner of conventional rubber tired lvehicle constructions. 1

According to a further phase of the present invention, the adjustable blasting nozzle can have an additional range of adjustment extending vertically of the car on which it is carried. Thus,l

by arranging for the nozzle to project out from one side of the car and to be vertically moveable from the top to the bottom of the car, the nozzle need not be confined Vto the vertical travel of the car itself. Advantageously, such extra nozzle travel can be correlated to automatically follow the vertical movements Lof A"the car.Y In' other words', the nozzle can be' adjusted so" that it is at the top of the car when the car -isatits highest position and automatically moves" down with the car so that it reaches the bottom- 10` of the car when the cargoes to itslowestposition. M'

As ymany apparently widely diierent lembodiments of this invention maybe made without departing from the 4spirit and scope hereof, it is to be understood that the invention is not limited to the specific embodiments hereof except as dened in the appended claims. i y What is claimed is: 1. In a blast room, a walled enclosure,r a track- Wayextending `across-the upper-part of the 'en'- closure, anV jelevator car suspendedfrom said trackway, means for'traversing said suspended car along said trackway. means for raising and lowering said cari relative to said trackway, and

blasting meansr carried by said carand mountedV least limited universal movement relative thereto,

and means under control of. anoperator within the car for'controlling'said traversing,elevating.

and blasting means.

l3. In a blast room,a walled'enclosure', ati-ack-4v way extending across the upper part ,of the en"- closure, an elevator car v'suspended from said trackway, means for traversingV said vsuspended car along said trackway, means for'raisinga'nd lowering said car relative to said trackway, `a

blasting gun carried by said car and mounted for,

at least limitedA vuniversal -movement. relative thereto, vand means under control 'of 'anpera'tor within ,the r car for "controlling said Vtraversing and f elevating means 1 and the operation and orientation of said gun; l

4; In a blast room,"a walled enclosure.' a track-4' way'extending across the upper'part of, vthe enclosure, an elevator .car suspended,v from? said traekway, means for traversing said suspended carfalong said trackway, meansfor raising "and lowering said carv relative to said trackway,l a high pressure hydraulic blasting gunV carried -by saidI car and mounted 'for at least limited universal movement relative thereto, and means under controlof anoperator within the car` forcontrolling said traversing `and elevating means yand theoperation' and orientation of said gun. y I

5. In a blast room, a walled enclosure, a trackwayV extending across the upper part .of thek enclosure, an elevator car suspendedv fromV said trackway, means tor traversing said .suspended car along said trackway, means-for raising and lowering said car relative to said trackvvay,l a high pressure hydraulic blasting gun carried by fsaid 1.

car and mountedufor at leastlimitedl universal movement relative thereto, means for stabilizing said elevator car against Aswinging under-the reactive force ofsaid hydraulic gun,v and Vmeansunder :control rof an :operator .withinthefcan for 6. In a4 blast room, awalledenclosure, a trackway extending' across the upper part 'vof -the enclosure, an lelevator lc'ar suspended from saidj trackway, means for traversing said suspended carv along said trackway, -means for ravisingjandv lowering-said ear relative Ato said `trackway; a

high pressure hydraulic blasting gun'carried by' 1 1i said car and mounted for at leastlimiteiv univerf sal movement'relative `threto',` means for stabilizlf'` ing saidelevator car againstswingingunderthe reactivorceof said hydraulic g`u'r`i at least one vrollervvay lyinut of the vplane of Lsiis-y s pensio'nof 4s'afiiciczi'rfrom s'ai. trackvvav.

'7."In`a blastroin, as Walled enclosure, etrackway extending lacross the` upper ,jat' of Yenclosure, an elevator car susfre'vnc'i-eci,lfronti.A said trackway, means yfor traversir'if';s'af'id,v suspended car falng' Said' traclvvlay;l means lfo'rl raisingl andV lo'wexingj's'aidbarf `'relative tf 'said trackvvay, a high pressure hydraulic ybl'asting gun `zcarriedwbv.. said,y carfndfnio'rted 'for' atjlleast l limited vvuni.- vif'salfinovemeht i -relative' thereto. rijieans l. torn stabizings'aid, elevatrfcalflagnst. swinginglynadr` tle'ctiv r'ce'f ,Sa'dliyd-lic un 'come pris'ing" a' downwardly' 'facing intimalr` and( a thrust roller running therein, and means under control of' anloljerator ,vvithinlthefcar forfco'ntr'le theretmmeans for traversingsid run'v'vayz, alongl v'ator aibncsajidrunwayglj 9. In 'a jbiast" room," 'a walled, enclosure, Y adinrst trackvjlay, T extendin'gwf thereacr 6s's` Wheeledfineans said 'Whooiofd .motto soiidittondin'g ttohsvoooiyl osf` jsai firstgtrackyvayg@ an', clei'z'aitr.ls'unporteil'` on f said i Qndtrackvvavandjtra ersable therealfng,A bist'ingfimeapscarreqgby ii`elevator 'me for tr'avjersinssaid whe-tied means along stemt trackwav,`"means for travefr'slingiYr said,..elevatory alongI said second ,trackvvam andl meansffo'r raising,and 'lo Veringsaidffelevator' and f guuifelfa 0fadfSttrackvvayh an. elvatoris'upnorted on; Saiii'totoiidltraokwav 'and trot' bloltiiorotilna.n a'hghpressure blast 'ricdbv's/idkvatr and moiiiitod for. at, ioostiliimtedmiiyer' ment relative theretonirieans vforftrove Wheeled means Aalong `said rst trackvva'l,l

means foi` traversing? salitil elevator 'Y alongv said ',sccond trackwjy,V and Imeans 'for rais' g fand lowering" eiiiig Soisi olovotor and. gunrelaiive to said ,trace Way.A y v l. j .i i

125 Iii Ti blast rooiii o ,Woliod tntlosunenav mst. ifackwiy-oiiiemiiiigiooroootho uooer ,port there. of, 'Wiiioiiiii iioiisiiuonios ;thorioom a ,second trookvovf Suspeiiiodf from ooifi;.'w1iooiosiimooos o'iid f ottidiri'sfltronlovorsolv oi saisi; tirst .tracks wt; mon'sfor-Stbiiiiiiis,.ooidooooiisitrookwov aginsttutihg;oiiivo to.-.Soi.d first trookwoyfoii; elevator suspendedhijdom said4 sectngi` ttkv'fivomi -tr'ovotso'iilo itiioiotioiignrrioaiis for; Siobiilitiiigtii iiiiiwoyosoinsttswirigiiisroiotive;

to' Soi@ Soooiidftiiiokwoy oiiolovotori` vertically movoloi io ,Stiii iiiiiwoy.' ooo' bloot YJ'ottinotomtom mouiotodoii Siiiitifolovotoi-i.

Y134Ir1tt b1ttst room.. owollodoiioioooto elitist,

troofiiwoyoiitiiiiiisoi'ooo tho. .toorfoort thorof Off Whooitoi` moons; rimning.- tiiorooo.Y o sooorio trjockwyi oliooomiod; from Said; whoolod moons.

and, oxtolndingf tiorisvorooiyfoil Soif@ first trooiif iiflsi traditi/ov, fortrovoroins .said runt/ analoog said second trackwayv,` and for traversing, said eioiototioioiigisoid;ruowayv14.v Ilya blast f room, a walled `-,oriolosuro. an

elevator icarA mounted for Yhorizontal, andl -verticalv` tr'tivor'sje withintoidoiiolosuro and adaptedrtoJbe brought into o position witiiaoiio-of its cari-.walls juxtaposed 'to o oortiooioo atoofof, said enclosurev Wollt,- odoor iliisoiiiooowalif @door .in Stilton:- ticulararea o f,said enclosure rivali.' andl blasting tiofito @il area-0 .Sit.id;.ei1o1 osuioWallis. dootin tho .-rorriwali of'soidiooria doorv in sanar-ea of.

enclos 4vvalhoif` lessvmeigtentrthanrthc area of. the .rearJ f -lsaid car, a dooiin another walk of. ittici loo-iii, carl'. whereby Said; Car not only i supports said biiisiiiiiiieiisfblit iolsoetorvos as an: ontrttnoofv iotlijioii.oodoilolosiiro-LY 1G Ilia; .blst momia Wal-lodi-onolosuro. a mov:

abie operatoifs ,caiy' within; said enclosurev and` mOYtibloiQiPQSitiQIiiiS-,loargwail,in.3uxtaposition toanvarea l offsaid enclosure wall, I a.v doorI in the foal* '.WiiliJOf; ,Soiti vCain; o :door Said area ofi en,-

olooiirovoii of- 'lotsl oxtonttiion .the orooot tho! Teil-Woll of; Soidfat': and; blasting mootnstoarticd.I

bvfsaio totti?, y

17. -Wotiifbiotinsofioioiriorit.oomprisinsianzenf olosofmovooio;oooiotorroatryinsoar having sub; i fills;.ot1:10.01?,.hinsot1-r i011 Oriolof; Saisir/oils. Y. ,aritifoooninszoutwardlyf; a door stop dening the closed position of the door,l

Siaiiiioii't'limoorvioiis out thoi'oirotoiidiooolviooofbiosiroooil thotoutof moiiooilvvkooooftlio; doof closed-1f.

18'.L Blasting hamnarat fromtoxioosuro totho stroom,"saidapparotusminf. cludmg an; eno1oscd,;:,b.1ast1ng 4room, xtrackway Stiiiotiiiccxtcnding--in. ldifferent directions across. the lipitor portion offtlio room. oxroporator-hoiior.. insertar-,f Carried.. `bv. tho ,traoiiwoy .Striioturo. 11m: poiliriginooiiotoiiiiottoi,y for.,moviiisythoooitwith sroooooi totiioiirooitwaviotiuoturooniirtoiusiirig; coliiiifolioioiioiits:withiitftiio oor-.for 'itoriipulotiont.4

and blitsiis moans, .Carried bsnraidy i i A i019toubiootingiartiolo. to. ,titor ooiiolifofiit dirootooloistloom, ofolos.tout,A Wiiiio ohieidiiigf-o dirootionfoontrollins operator..

20. The combination as dened by claim 18 in Y which the blasting room has four generally rectangularly positioned side walls, the trackway structure includes a continuous U-shaped rail fixed in place adjacent the tops of three of the walls, and the control elements include vertically adjusting mechanism connected to the rail and supporting the car in vertically adjustable position with respect to the Walls.

WILTIE I. GLADFELTER.

REFERENCES CITED The following references are of record in the file of thispatent:

UNITED STATES PATENTS Number Name Date 1,628,317 Hoevel May 10, 1927 1,655,767 Hoevel Jan. 10, 1928 1,656,238 Ruemelin Jan. 17, 1928 1,977,386 Holes Oct. 16, 1934 2,440,222 Keefer Apr. 20, 1948

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