USRE12441E - Excavating-wiachine - Google Patents

Description

REISSUED JAN. 30, 1906.

0. c. JACOBS. EXUAVATING MACHINE.

APPLICATION FILED 13150.26, 1905.

Invenion Gina/1124 C. f x/1 (14.41415.

6 SHEETS-SHEET 1.

s e s 49L (gil REISSUED JAN. 30, 1906.

G. C. JACOBS EXGAVATING MACHINE.

APPLICATION FILED DEC. 26. 1905.

6 SHEBTSSHBET 2.

Inventor:

REISSU ED JAN. 30, 1906.

C. G. JACOBS. EXGAVATING MACHINE. APPLIPATION FILED DEC.26, 1905.

2w T E E H A S T E E H S 6 Tlfiircesa eL' 8 SHEETS-SHEET 4.

REISSUED JAN. 30, 1906. C. C. JACOBS.

' EXGAVATING MACHINE.

APPLICATION Hum DEO.26. 1905.

5 Ga /1.5.? g

an z REISSUED JAN; 30, 1906.

0. G. JACOBS. EXGAVATING MACHINE. APPLIOA TION mum D130. 26, 1905.

'6 SHEETS-SHEET 6.

Jrt-nrercfor:

REISSUED JAN. 30, 1906. c. 0. JACOBS.

EXCAVATING MACHINE. APPLIGATION'FILED maze. 1905.

8 SHBETSSHIZET 6..

6671666 ea: I I a/6106 07".- fi 7 (Am 0. -M 49424; *7 4mg.

rnvrrnn STATES. PATENT oFFIon.

CHARLES C. JACOBS, OF AMBOY, ILLINOIS. ASSIGNOBTO THE JACOBS STEEL EXCAVATOR COMPANY, OF AMBOY, ILLINOIS, CORPORATION OF ILLINOIS.

EXCAVATI NGv-MACHINE.

Reissued Jan. 30, I906.

Original No. 794,410, dated July 11, 1905. Application for reissue filed December 26, 1905. $erial No. 293,428.

To (all whom, it nee/y concern:

Be it known that I, Cinemas 0. J ACOBS, a citizen of the United States, residing atAmboy, in the county of Lee and State of Illinois, have invented. certain new and useful Improvements in Excavating Machines, of which the following-is a specification. I

My invention relates to excavating niachines of the classor type known as ditching-machines, wherein the dirt is raised and discharged by one or more buckets having a.

. said buckets in such manner as to accurately conform with the alinement, grade, and side slopes of canals and other excavations. I attain these objects by the mechanism illustrated in the accompanying drawings, wherein i Figure 1 is an end elevational view, partly broken away, of the complete machine. Fig.

2 is a top plan view. Fig. 3 is a side eleva tion, partly in vertical section, on the line 3 3 of Fig. 2. Fig. 4 is an enlarged side eleva' tional view of the upper portion of the main supporting frame, more particularly illustrating the means for raising and. lowering the transverse bucket-carrier frame. Fig. 5 is a cross-sectional detail view on the line 5 5 of Fig. 4. Figs. 6 and 7 are respectively side elevation and top planfviews of one of the buckets audits truck. Fig. 8 is a vertical sectional view of the same on the line 8 8 of Fig. 6. Fig. 9 is a detail elevational view, enlarged and partly in longitudinal section, of the outer end of the bucket-carrier with the dumping devices carried thereby. Fig. 10 is a top plan view of the parts shown in Fig. 9, and Fig. II is a cross-sectional detail view on line 11 11 of Fig. 9.

My invention comprises as its leading distinguishing characteristics a skeleton. or openwork frame supported at its opposite sides on wheels traveling on tracks disposed along side of and' parallel Withthe ditch or trench to be excavated, a transversely-disposed bucket-carrier having a horizontal intermediate portion and upwardly and outwardly inclined end portions overlying the sides or banks of the trench, this carrier conforming in shape to the contour ofthe trench to be dug and being vertically adjustable on the main supporting-frame, with a pair of bucketsmounted to travel back and forth on a-track on said carrier, said buckets alternately scraping or shaving the surface of the excavation in a crosswise direction as they travel to and fro, automatically dumping and depositing the gathered earth at the outer ends of their travel. The machine is also provided with means whereby it is selfpropelling along the track from one cutting position to the next.

Turning to the drawings for a more specific description of the arts comprising the apparatus, 15, Fig. 3, esignates each of $138.11 of longitudinal sills in the under sides of which are journaledcarrying wheels 16 and 17,

adapted to travel on the rails 18 of a track disposed alongside the ditch, said sills being connected by end sills 19 and an intermediate transverse sill 20. Suspended from the under sides of one of the end sills 19 and the intermediate sill 20 are a pair of longitudinally extending joists 21, Fig. 1, which support a series of transverse joists 22, on which is laid a platform 23, supporting a boiler 24 and engine 25. From the corners of the platform 23 and the rear end sill 19 rise a series of posts 26, which are connected together at their upper ends by longitudinal and transverse joists 27 and 28, respectively.

29 represents obli ue braces extending from the upper ends 0 the uprights 26 laterally to the outer ends of the horizontal transverse sills 19 and 20. Other tension bracerods 30 connect thediagonally opposite corners of the rear and intermediate uprights 26 in a direction transversely oi the frame, while other tension brace-rods 31, Fig. 3, similarly connect the diagonally opposite corners of the front and intermediate uprights 26.

In and between the rear and intermediate pairs "of uprights 26 isdisposed a transversely-extending bucket-carrier, consisting generally of a track-supporting frame having a horizontal section 32 and upwardly and and confining members for said true s.

' termediate their ends.

outwardly inclined sections overhanging own, is made up of a pair of bent sidebars 5,,or'plates 34,Fig. 11,'to-the'inner'sides of which are riveted upper and lower angleirons 35 and 36, said bars 34 bein connected and rigidly spaced by lattice-wor 37..- The angle-irons 36 constitute tracks for the trucks of the buckets, hereinafter described, the angle-iroris 35 constituting cooperatin guidrirfig e inclined sectlons 33 are preferably hinged" to the "intermediate horizontal section '32 at points indicated at 38, and the inclined'sections '33 may also have a "hinge-j'oint 39 in- The joints 38 determine the inclination of the inclined sections '33 as'a who'lefwhich in turn determines the angular inclination of the side slopes of the ditch or trench, and the joints 39 determine the inclination of the outer portion of the arms 33," which in turn determines the height from which the buckets are discharged and the distance to which the excavated material is deposited laterally of the trench. The uphin ed 'at the rea: wal s by pivot-bolts Eer ends of the arms 33 are connected by a tiear 40, made in two sections and adjustabliy united" at 4:0 to provide for the angular a -justment of said arms, as alreadydescrib'ed.

On the track of the bucket 'carricr are adapted to travel a pair of cutting and excavatlng-buckets working in opposite directions and designated as entireties by the'l'et- 35R tors A and B, respectively. As these buckets and their supportingtrucks" are duplicates, relative positions upon trate' the buckets in detail, 41 designates the sidewalls, and 42 the c )ncave integral bottom and rear wall, of the irucket, the latter terminating at "its lower end ina forw .:lly-pro jectingtransver 'ie cutting edge 42. It will thus be seen that tw'ibucketis open on top and at its advari :e end.

Jpei; portion of its side between the parallel side bars of a rectan'gi lari tr uck frame 44, the

'overhan 'ng enils olg' said side bars having mounte therein liIC I ll and rear axles 45 and 46, respectively, earn-firing on their outer ends wheels 47 and 48. it ,will be'noticed that the forward-wheels 17 cm {of narrower tread than the rear wheels dB for a purpose which will hereinafter appear. Transverse front" and rear braces49 and 50 of the truck-frame are connected by diagonal braces 51, and a clevis 52 is secured to the cross-brace 50 directly beneath the meeting ends of the'diag'onal braces 51. To the upper forward ends of the side w: s 41 of the bucket are semired flan ea {13, adar ted to overlie the upper dges of t e ride bans 44, and thus sustain the forwerd ciidof the bucket with provision for This bucket is.

in F-ig. 1, are located on the track of the car-' rier, so as to face in opposite directions, and

the rearaxles 46 of the two buckets are com nected by one or more links 54, as plainly shown in Fig. 9. The lower track-bars 36 on the inclined sections 33 of the carrier are provided near their outer ends with holes 36,

Fig. 10, wide enough to permit the forward wheels 47 of the bucket-carrying trucks to fall therethrough, but narrow enough. to allow the wider rear wheels 48 to travel thereover. To

the under side ofthe inclined carrier-sections 33 and beneath and be end the openings 36 are secured V- shaped frames 55, provided with supporting-tracks, on which the forward wheels. 47 may run after falling throu h the apertures 36 to guide the buckets to dumping position.

Considering now the means for actuating the buckets, 56 designates a cable, the course of which may be traced as follows: At one end it is secured to the clevis 52 of the bucket B, passing thence upwardly and outwardly over a guide-sheave 57 on the'upper end of the right-hand wing 33 'of the bucket-carrier, thence inwardly between a pair of grooved guide-sheaves 58 and 59, suitably mounted on the upper portion of the central supporting-frame of the machine, thence around a horizontal sheave 60, thence forwardly and ov'era vertical sheave 61, and thence downwardly to and around a winding-drum 62. 56de'signates the companion cable, which is similarly connected to the clevis 52 of the other bucket A, passing thence downwardly beneath a pair of vertical guide-sheaves 63 and 64, mounted above the ends of the horizontal' carrier-section 32, thenceupwardly along the left-hand'inclined section 33, engaging pulleys 57 58 59, 60, and 61, and thence passing downwardly and secured to a companion winding-drum 62*,disposcd alongside of the drum 62, and so geared as to rotate simultaneously in an opposite direction to the latter. geared to the main driving-shaft of the engine (indicated at 63) by clutoll-controlled geari-n well known and understood in this art, w creby by shifting the hand-lever the The drums 62 and '62" are relative directions of rotation of said drums may be reversed or stopped altogether to effect the proper reciprocations and rests of the buckets A and B.

In the o eration of the machine the transverse bu'c et-carrier has a bodily vertical movement on its supports, the carrier occupying its highest position at the beginning of the digging movement of the buckets and being gradually lowered a step-at a time between sucussivc merits of the buckets un til the full prcdctertransverse cutting movcmined depth of the ditch or trench is attained. Thereafter the carrier is raised bodily to its full'height, the machine moved another step in advance, and the same operaparallel main carrier side bars 34 is an upright channel-guide consisting of a flat bar 65, to the outer face of which is secured a pair of angle-irons 66, constituting the side walls of the channel, said side walls slidingly engaging the heads of the I-bcam guides64,

travel of the bucketcarrier.

as plainly shown in Fig. 5. Secured to the inner or base wall o the channel near the upper end thereof is a stationary nut 67, containing an internally-threaded vertical a ierture, which is engaged by a threaded r0 68,

the upper end of which is journaled in the upper cross-bar 37, while its lower end'68 is reduced in diaineter and rotatably mounted in an intermediate bearing-block 69, bolted to the upright 26, an intermediate fillingbloek 69 being interposed behind the web of the I-beam. Thelowcr end or spindle 68 of the rod 68 is threaded at its tip to receive nuts 7 O, which confine the rod against bodily upward movement. The inner rod' 68 of each pair has fast on its upper end a pair of upper and lower sprockets 71 and 72, respectively, while the outer rod of each air carries a sin e sprocket 73. The sproc ets 72 and 73 on each side are connected by an endless sprocket-chain 7 4, whereby the rods 68 on each side .are simultaneously and equally driven. 75 designates a vertically extending shaft, Fig. 3, on the upper end of which. are mounted a pair of upper and lower sprockets 76 and 77, respectively. The upper sprocket 76 is connected by an endless sprocket-chain 78 with the to sprocket 71 on one side of the machine, w rile the lower sprocket 77 is similarly connected by an endless sprocket-chain 7 9 with the top sprocket 71 on the other side of the machine-frame. in this way the rotation of the vertical shaft 75 imparts a simultaneous and equal rota tion to all four of the threaded shafts 68. In view of thefaet-that the bucket-carrier rejquircs to be moved both up and down provision. must be made for driving the shaft 75 in either direction, according to the required This may be done by any known and approved motionreversing mechanism, such a mechanism being indicated in Fig. 3, wherein the shaft 75 is provided with a pair of oppositely-faced bevel-p'inions 80 and 81, splined thereon and shiftablc by a lever 82 to throw either pinion into engagement with a bevel-pinion 83 on a horizonta counter-shaft 83, suitably geared to the driving-shaft 63 of the engine.

It is obvious that as soon as the machine has effected. a transverse cutof the required depth it is necessary to raise the bucket-carrier and advance the machine bodily over the track 18 for the excavation of the next succeeding cross -section. To effect this, the axles 16, Fig. 1, of the forward and intermediate wheels 16 are suitabl geared to the engine, so as to be positive y driven thereby when required. In the drawin s I have indicated. a conventional form 0 gearing for this urpose, wherein 84 designates a counter-siiaft which may be operatively connected with the engine through a clutch, (indicated at 85.) The shaft 84 carries a sprocket 86, which is geared to a larger sprocket 87 on the forward axle 16 by a sprocket-chain 88, and a companion sprocket 89 transmits, through a sprocket-chain 90 and sprocket 91, an equal rotation in the same direction to the intermediate axle 16. The propulsion of the machine rcarwardly as well as for'wardfy might be effected, if found necessary or desirable, either by reversing the engine or providing the driving connections with a suitable motion-reversing mechanism, such as that already indicated in connection with the vertical shaft 75.

The operation of the apparatus has been to a considerable extent indicated in connection. with the descriptionof its parts and mechanism. Assuming the parts to be in the position indicated in Fig. 1 and the bucket-carrier to be lowered through the rotationof the shafts 68 inthe proper direction, the drums will be rotated in a direction to wind up the cable 56 and pay out the cable 56. This will draw the advancing bucket A into the trench, while the rear bucket B will follow idly, rear end'foremost. The bucket -A in crossin the trench will shave off a layer of earth 0 a thickness sufficient to constitute a load for the bucket, which wil then be drawn up by the left-hand wing or arm of the carrier until the disehar 'er 55 is reached, whereupon 55, while the rear wheels of the;truck, eing of wider tread, will pass over the apertures, and the bucket will thus be inverted and will dump its load in the manner indicated at the right in Fig. 1. The driving connections for lowering the bucket-carrier will then be given a limited operation sufficient to lower the carrier to a proper position to remove the next the forward whee ls will drop through the apertures 36 of the track running onto the uide "ries of operations will be repeated.

' "From the foregoing it will be seen that the machine effects a clean, sharp, and positive cut, making a trench with a flat bottom and uniformly sloped or inclined sides, the degree of inclination. of the latter being adjustable within certain limits by varying the inclina tion of the wings 33, but always presenting smooth and uniform side slopes or banks.

, 'l he excavated material is discharged to a considerable distance landward,which may be varied within limits by changing the in- 'clination of the outermost sections of the wings 33. The machine may also readily be constructed. to provide for the excavation of ditches or trenches of varying width by rendering the intermediate horizontal section 32 of the bucket-carrier adjustable as to length, as indicated in Fig. 1, with suitable provisions for adjusting inwardly and outwardly to the same extent the side wings 33 to fit any predetermined lengths of intermediate section 32.

The machine as herein described and shown is mounted on rails, adapting it to the excavation of a surface ditch or trench; but it is. obvious that the apparatus might be mounted on one end of a barge and the bucket-carrier lowered so as to effect the excavation of material from the bottom-0f the stream or other body of water to increase the depth of the latter for navigation or other purposes.

It is evident that the machine as described and shown may be very considerably varied in respect to details of construction and relative arrangement of parts without departingfrom the principle of the invention or sacrificing any of the advantages thereof. Hence I do not limit the invention to the precise constructions and arrangements as shown and described except to the extent indicated in specific claims.

' With further reference to the arrangement and operation of the two connected excavating scoops or buckets the drawings show them relatively spaced or held apart by links 54; also, that each of said excavating scoops or buckets can tilt independently of t e other and that the link connections form articu- "lated or flexible connections whereby a bend or fiexure may occur in the line of buckets, so as to permit them to conformto the guide and also conform to the transverse curvature of the ditchwhen the guide is arranged transversely to the trench-line. For example,

while one scoop or bucket is moving down a straight inclined side wall portion of the ditch the other scoop can be traveling across either atransversely-curved ora transverselyplane bottom portion ofthe ditch, it being obvious that in such case there is a relative tilt between the two scoops orbuckets and that this is permitted by suitable flexible connection in contradistinction to a ri id connection between the two scoops or buckets. Also when the scoops or buckets descend from the position shown in Fig. 1 the bucket which is ahead will upon reaching the first bend in the guide-track tilt in conformity with such bend, while at the same-time the other scoop is traveling down the straight inclined portion of the guide-track.

1. In an excavating-machine, the combination with a supportmg-frame, of a bucketsupporting trac mounted thereon tran.s versely of the ditch or trench to be du and conforming to the cross-sectional 'pro' le of v the latter, an excavating-bucket pivotally mounted to travel on said track, and means for drawing said bucket back and forth over said track, substantially as described.

2' In an excavating-machine, the combination with a su porting-frame, of a bucketsupporting trac mounted thereon transversely of the ditch ortrench to be du and conforming to the cross-sectionalpro e of the latter, an excavating-bucket mounted to travel on said track, means for drawing said bucket back and forth over said track, and automatic bucket-dischargin means on the end of said track, substantially as described.

3. In an excavating-machine, the combination with a su porting-frame, of a bucketsupporting trac mounted thereon transversely of the ditch or trenchto be du and conforming to the cross-sectional pro le of the latter, a pair of oppositely fa'ced excavating-buckets pivotally mounted to travel on said track, one of said buckets cutting and filling and the other returning idly on each travel across the ditch, and-means for drawing said.buckets back and forth over the track, substantially. as described.

4. In an excavating-machine, the combination with a su porting-frame, of a bucketsupporting trac I IIlQi. ed thereon tran;-'-.--

versely of the ditch or trench to be du and conforming to the cross-sectional pro le of the latter, a pair of oppositely-faced excavat ing-bucketspivotally mounted to travel on \said track, one of said buckets cutting and filling and the other returning idly on each travel across the ditch, .a link 'connectingsaid buckets, and means for drawing said buckets back and forth over the track substantially {as described.-

5. In an excavating-machine, the combination with a supporting-frame, of a bucket supporting and guiding track mounted thereon transversely of the ditch or trench to be dug and conforming to th: cross-sectional profile of thelatter, means for bodily raising and lowering said track in .a vertical plane by a sin le operation, an excavating-bucket mounted to travel on said track, and means on transversely of the for drawing said bucket back and forth over the latter, substantially as described.

6. In an excavating-machine, the combination with a supporting-frame, of a bucket supporting and guiding track mounted thereon transversely of the ditch or trench to be dug and conforming to the cross-sectional profileof the latter, means for bodily raising and lowering said track in a vertical plane, a pair of oppositely-faced connected excavatmg-buckets mounted to travel on said track, one of said buckets cutting and fillin and the other returning idly on each travel om end to end of the track, and means for drawing said buckets back and forth over the latter, substantially as described.

7. In an excavating-machine, the combination with a supporting frame, of a bucket supporting and guiding track mounted thereditch or trench to be dug and conforming to the cross-sectional profile of thelatter, automatic bucket-discharging means on each end of said track,- means for raising and lowering said track, a pair of oppositely-faced connected excavatmg buckets or scoops mounted to travel on said track, one of said buckets cutting and filling and the other returning idly on each. travel from -end to end of the track, and means for drawing said buckets back and forth over the track, substantially as described.

8. In an excavating-machine, the combination with a' suppprtingirame, of a bucket supporting and guiding track mounted thereon transversely of the ditch. or trench to be dug and conforming to the cross-sectional profile of the latter, means for bodily raising and lowering said track in a vertical plane by a single operation, an excavating bucket or scoop mounted to travel on said track, means for drawing said bucket back and forth over said track, and means for advancing the machine bodily from one cutting position to another, substantially as described.

9. In an excavating-machine, the combination with a supporting-frame, of a bucketcarrier mounted thereon and comprising a transversely-extending frame consisting of a horizontal intermediate section and upwardly and outwardly inclined end sections, a track comprising supporting and guiding rails extending from end to end of said carrier-frame, a truck mounted to travel on said track, a de ending excavating bucket or scoop pivota ly mounted on said truck, and means for drawing the truck back and forth over the track, substantially as dk 'cribed.

10. In an excavating-machine, the combination with a supporting-frame, of a bucketcarrier mounted thereon and comprising a transversely-extending frame consisting of-a horizontal intermediate section and upwardly and outwardly inclined end sections adjustable relatively to said intermediate section, a track comprising supporting and. guiding rails extending from end to end of said carrier-frame, a truck mounted to travel on said track, a de ending excavating bucket or scoop mounte on said truck, and means for drawing the truck back and forth over the track, substantially as described.

11. In an excavating-machine, the combination with a supporting-frame, of abucketcarrier mounted thereon and comprising a transversely-extending frame consisting of a horizontal. intermediate sectionand up: wardly and outwardly inclined end sections, said end sections being hinged to said intermediate section so as to be angularly adjustable relatively thereto, a track comprising supporting and guiding rails extending from end to end of said carrier-frame, a pair of connectedtrucks mounted to travel on said track, oppositel or scoops yielda ly mounted on and depending from said trucks, and means for drawing said trucks back and forth over the track, substantially as described. 1

12. In an excavating-machine, the combination with a supporting-frame and a transversely-disposed bucket-carrier mounted thereon, of a continuous track on said carrier having openings formed in the supportingrails of the track near its ends, a bucket-supporting truck mounted to travel on said track and having wheels of different widths of tread at its opposite ends, one pair of wheels being adapted to drop through said openings of the track and the other pair to ride over the latter, and an auxiliary track adapted to support the narrow wheels of the truck and guide the bucket into discharging position, substantially as described.

13. In an excavating-machine of the class described, the combination with a bucket supporting and guiding track, of a truck mounted to travel thereon, an open-faced bucket or scoop pivotally mounted at its rear end between the side bars of said truck, and means affording a limited play ofthe forward end of said scoop transversely of the truckframe, substantially as described.

1.4. In an excavating-machine of the class described, the combination with a bucket supporting and guiding track, of a pair of trucks mounted to travel thereon, a link connecting the inner adjacent axles of said trucks, a pair of open-faced excavating buckets or scoops pivotally and oppositely mounted in said trucks, respectively, and cables connected to said trucks and serving to alternately actuate the latter from end to end of said track, substantially as described.

15. In an excavating-machine, the combination with a supporting-frame, of abuckct -faced excavating buckets supporting and guidingtrack mounted there- 1' on transversely of the ditch or trench to be dug and conforming to the cross-sectional tatably mounted in said frame and supporting said track, means for rotating said rods whereby to bodily raise. and lower said track,

'an excavating-bucket mounted to travel 011 means for drawing said bucket i said track, an back and forth over the latter, substantially as described.

lengthwise-adj ustable horizontal intermediate section, and upwardly and outwardly inclined end sections, a .bucl e't-supportin track extending from end to end of sai bucket carrying stantially as described.

In an excavating-machine, the :com'bi nation with a supporting-frame, of a b'udke't,

supporting and guiding track mounted theieon transversely of the 'ditch or trench to be dug and conforming to the cross-sectional profile of-the latter, means for bodily "raising and lowering said track in a vertical plane by nation with a supporting-frame, of a bucket 5 mounted thereon 'tra'nssupporting trac the latter, screw-threaded rods ro- I dinal contour of the frame, and a bucket or: scoop mounted to travel over said track, 'sub-" ported to travel along said versely of the ditch or trench to be duigl and conforming to the cross-sectional pro of the latter, a pair of excavating buckets mounted to travel on said track, and means 'for discharging said buckets one at each end i of the track, respectively.

19. ,In an excavating-machine for ditches, the combination with a sulpportmgframe, of a (guide-track -suppor thereby and arrange the trench; a pair of oppositely-facing'excavating-buckets supported to travel back and forth along connection between the buckets 'ermiti'iin them to individually conform in t eir trave to deviations from a right line in the longitu-- guide-track.

20. In an excavating-machine for digging ditches, the combination with a su portingframe, of a uide-track supporte thereby and arranged transversely to the "trench-dine and conforming to the transverse contour of the trench; a pair of oppositely-facing and relatively 's aeed excavatin -buckets' sup; rude-track; fiexi ble "connection between the buckets permitting them to individually conform in "their travel to deviations from a right line in the longitudinal contour means for drawi'n the air of excavatingbue'kets back and orth a ongthetrack.

"CHARLES o. JACOBS; Witnesses:

WILLIAM A. GREEN, K JENNIE AJOHMI'N.

digging transversely to the trench-line j and conformable to the transverse contour of In an excavating-machine, the cohibii nation with a supporting-frame, of a bucket 5 carrier mounted thereon and comprising a transversely-extending frame consisting of a of the guide-track; and

Images