US2138103A

US2138103A - Road paving machine

Info

Publication number: US2138103A
Application number: US158150A
Authority: US
Inventors: Jorgensen Enoch Berg
Original assignee: Viber Co
Current assignee: Viber Co
Priority date: 1937-08-09
Filing date: 1937-08-09
Publication date: 1938-11-29
Anticipated expiration: 1955-11-29

Description

I Nov. 29, 1938, E, B. JQRGENSE l 2,138,103

ROAD PAVING MACHINE Original Filed April 50, 1935 3 SheebS-She'ei l INVENTOR.

ATTORNEY.

Nov. 29, 193s. E; JORGENSEN 2,138,103

ROAD PAVING MACHINE Original Filed April 30, 1935 3 Sheets-Sheet 2 INVENTOR.

BY/wfm ATTORNEY.

Nov. 29, 193s. E, B, JORGENSEN 2,138,103

ROAD PAVING MACHINE original Filed Apri-1 so, 1935 s sheets-sheet 3 ATTORNEY.

Patented Nov. `29, 1938 Y. .l

` 2,i3s,1o3 f f ROADPAVING'MACHINE y Enoch Berg Jorgensen,LosAngelea'fCalf., as-l `signor, by mesne assignments, to Viber Company, Los Angeles,lCalif,.,a corporation of California YContinuation of application Serial No. 19,055, April 30,1935.y This application Augst 9, 1937,

Serial No. 158,150

` v claim. (crei-48x UNITED T-STATE This invention relates to paving machines, and which.k holds the strike-off ,bar 132 in rigid posiin particular tomachines for laying plastic mation relative to the carriage frame, is afnishing terials such as concrete upon a prepared roadway; plate 38 which is free to be moved over the top This application `is a continuation of -myg cof; ,surface4 ofthe paving material. Inthe following 5 pending application Serial No. 19,055, led April description and claims,concrete is specifically re- 5 v 30, 1935. The objects of my; invention are to pro- `ferred to, but the machine may be usedin WOIk-v vide a machine which levelsoffand compacts a ing anyother suitable plasticmaterials which mass of concrete or other plastic materials placed may be employed for paving, including black or upon the roadway; to; provide a machine ,whichV asphaltic'mixtures and the like. 1 l L vibrates the concrete andother plasticmaterials u My machine is preferably used along a roadway 10I in place on the roadbed; to providea machine which has been graded and prepared for paving which givesva compactand finished'pavementpto by providing headers l1 for the margins of the provide a machine with means for vvibratingrthe.v pavement. It is also usually the practice to in plastic material on a roadbed between crosswise sert at intervals, cross-members, indicated at 43, i l expansion joints, and with means for raising and which may be lumber, or may be pre-formed ex- 15 lowering the vibrating mechanism over ,these i pansion joint vmemberamade of compositionvma# joint members; toprovide. a .method for placing terials. The Wheels yI6 of the carriage of my maand finishing -a plastic massas. a paving. These chine are designed to roll` on the headers .|1, and other objects will be apparent from the0 folalthough lother traction means may be employed;

zo lowing description and the drawings in which The carriage may be propelled along thehighway Fig. 1 is a side section taken v4at l-I `of Fig. 4, by any suitable means, such as a motor mounted of one form of my paving-machine; von thecarriageto `drive thewheels I6 or'the ma- Fig. 2 is a partial side section taken-at 2-2 of chine may be attached to `otherequipment used i Fig. 3, of a portionof my machine showing the similiarly over the roadway; or by tractors at the g5 vibrators in a partly withdrawn position. I side of the roadway. Also there may be'assembled 25 Fig. 3 is a forward end elevationof the machine, onvthe carriage of my machine a gas" propelled with the vibrators in position indicated in Fig.: 2,.v engine to drive 'the vibratorsA directly through and with parts and gportionsibrokenaway to flexible 4drive shaftsorva gas propelled motor for facilitate illustration; ydriving air compressors tofurnish compressed air Fig. 4 is a pl view of the paving machine, with for air motors attached

tothe vibrators

20, or 30 parts and po ions removed to facilitateV illustrafor driving a generator to supply electrical-energy tion. for the .vibrator motors 22 if Aelectric motors. My paving machine, in, one form, consists of a. This auxiliary equipment maybe selected to suit carriagehaving side members H, cross members the conditions applying where the road yis` being I2, I3, I4, and |5,'wheels I3 adapted to travel onpaved. y y 35 headers or side boards Il forming the iside mar-l The structure of my machine may bel varied ingins of the roadway. The wheels .Ilaresup-` detail, thearrangementshown being simple and ported in bearings lby shafts I9.l lVibrators 20y ydesigned toillustratethelprinciples, andtoshow connected by flexible driveA shafts .2l to'rotary 'one embodimentof my invention".v `Four Asimilar means 22 are mounted by clips 30 uponsupport vibratorunits20 are shown butrany number may 40 members 23 which .are attached to the shaft 24, besused; asrequired, toset the concrete in suitwhich is adapted to-be rotated inthe bearings 4l' :able'vibration across the full width of the paving mounted on the side members I I.. Arworm 25 on' strip or slab. AItvhas' been well demonstrated here-` a shaft 26 rotatably held inbrackets 21 and havr`tofore that high frequency vibration `oftunset y i5 ing a handwheel 28 operates through the vvorm' concrete mixes causes the material to flow and be 45 gear 29to raise and lower thesupport members compacted into a designated space,` giving' a 23, and the vibrators20 attached thereto. "L'ongil denser and strongerfnished concrete. vThe tudinalsupport members 3|: for'theraislng and vIvibrators may be of any suitablefmechanism lowering means are attached tothe. carriage cross J which will produce'. high frequency/vibrations `in f members r'I3 and I4. A strike-off bar 32 vwhose theV concrete; an eccentricxweight mounted upon 50 vertical position is adjustable by means of slots a shaft within a protecting shellbeing a preferred 33 and bolts and nuts,34,:isattached tothe underform. Such a .vibrator is shown in my co-pending side of the carriageframe by bracket means 35,r patent applicationASerial No.,'7,927 `datedvFebruwith angle braces 36 to the cross-member I4.` At.- lary 23, '1935, issuedl as Patent No.v 2,018,789

tached by chains 3l to theebracketmeans 35, October29, 1935. By the use' of yvibration fre- 55 vibrated rapidly by the rotation of the 'motors 22 'A through the flexible drive shafts 2| quiciqy dig their free ends into the moist loose concrete. Simultaneously the paving machine is moved forward along the roadway and the vibrator tubesy 20 take the position inclined downwardly and rearwardly as indicated in Fig. 1, and are pulled in this position through the concrete. This inclined position of the vibrator has been found to be important in producing' a compact mass of` concrete, and in closing up the furrow made by the vibrator as it passes through the mass. It has also been found that by using the vibrator tube in this inclined position that any air trapped in the concrete, which would cause voids, passes up around the inclined tube, thus allowing the Y concrete immediately above the lower .tip of the vibrator tube to be compacted from the bottom to the top of the layer. A

' While the use of my machine requires that the concrete mass be distributed fairly evenly over i' the roadbed ahead of the machine, to overcome the disturbance oflevels caused by pulling the vibrators through the concrete. and to provide for the final leveling of the top surface after compaction, a strike-off bar 32 is placed abovev the vibrators 2 0 in their lower position. It has been foundtha't since the vibrators 20 cause the mass of concrete in ,the immediate surroundings to vibrate, that this strikefofvbar 32 will function best if rigidly attached to the carriage frame. -f

, the mass is stillvibrating. I

Its vertical position is made adjustable to suit the particular operating conditions. As pointed out, as the concrete is vibrated,someof the "cement paste, that is some fines including cement with water comes to the surface, following particularly'the path of the inclined vibrator tubes.

The strike-ofi bar 32 levels off theconcr'ete, particularly this-fine materialwhich floats to the top, and the final road finish is produced by the finishing plate 38, which is attached behindthe strike-off bar 32 and directly above the lower end of the partly submerged inclined vibrator tube 20, in its lower position. I have discovered that a sheet metalA plate 38, preferably'curved with the convexsurface formingthe contact on the surface of the concrete, and without weighting, and attached for loosely draggingover the surface, gives a satisfactory road surface finish. The concrete under the finishing plate 38 is in vibrating condition from the action Aci' the vlbrators 20. Vibrations are transmitted vto-the plate 38, and this, floating plate under its own weight brings the proper amountof fine material and water to the surface to insure the correct surface compaction and smoothing. f

To avoid or skip the cross-partitions or. ex-

pansionjoints which are used in long stretches of pavement,A thevibrators 20, as they approach these cross members V40 are gradually raised to a vertical position as indicated in Fig. `2. The vibrators are then lifted out ofthegconcrete by the further rotation of the support l23, thus vibratingall of the concrete upto the Joint and attached as shown, or coupled up tothe top surface where the vibrator leaves the concrete.

As the whole machine is moved forward. the vibrators 20 are re-inserted in the concrete (to the left of 40 in Fig. 2) and the `vibrators again take the inclinedpositions as shown kin Fig. 1 as themachine moves still farther forward. 4'I'he vibrators 20 must be kept operating, thatv is vibrating, during the insertionI passage through,

v and withdrawal from the concrete mass on the roadbech In the preferred arrangement of parts, as shown and above described, electric motors drive the eccentrically weighted shafts in the vibrators 20, through the flexible drive shafts 2|; and in each unit the motor. and vibrator are so placedas to more or less counterbalance each other on the supporting members 23. The vibrators 20 may be operated inany suitable manner, by electric motors, or air motors, and they may be close to the vibrating tubes 20. The arrangement shown provides the necessary flexible vibration-dampening connectionbetween the motor andthe vibratorl itself, and the support 23, so that the whole ma4 l chine-is -not vibrated, and -thus increasing the available vibrational energy which may be transmitted directly tothe concrete. The vibrator'k units' 20 may be so constructed as to contain the motive power andthe eccentric weight as van integral yvibrating mechanism.

'I'he method of operation consists in vibrating the spread-out concrete mass by Ipulling through it vpartly submerged vibrating elements, hereby 1 causing the unset concrete in proximity with the vibrators to be set in vibration, and simultaneously striking ofi the top surface by means of a rigid strike-off bar, and smoothing and slicking over the iine mixture of sand', cement and water which rises tothe' surface during vibration, by dragging a finishing 'plate over the surface immediately after the vibration, and while While I have lillustrated my invention by one preferred embodiment, I do not wishto be limited bythis particular arrangement of parts, but desire to include within the vscope of my invention thecombinations and' arrangements substantially as set forth in the following claims.

1. In a road paving machine adapted to travel along a prepared roadway upon which has been placed aniunset-and uncompacted concrete mixyture, vibratorymeans attached to said carriage Y land adapted toA be moved through-the concrete,

a crosswise top-'leveling strike-off bar rigidly attached to the carriagevof said machine and'adapted to roughly level oil.' the top surface of the vibrating concrete mixture between said vibratory means and said strike-off bar, an unsupported surface-finishing plate adapted to'float on the top surface. of the concrete and to be dragged over the concrete surface behind-the strike-off v bar4 at a' position substantially directly over'the lower end of the vibratory means. v

,2. Inl a road paving machine adapted to travel along a prepared roadway upon which has been distributed an unset and uncompacted concrete mixture, partly. submergible tubular vibratory means inclined downwardly and 'rearwardly rela- `tive to nthe forward end of 'the machine and adapted to be moved in this position through4 the unset concrete with-the forward movement of the machine.l acrosswise top-leveling strike-'ofi' bar rigidly attached to the carriage of said ma chine at a position rearwardly of the top surface end of said vibratory means, and a surface-finishing plate adapted to be dragged over the vibrating portion of the concrete at a position substantially above the lower end of the vibratory means and rearwardly of the strike-off bar.

3. In a road paving machine, a carriage adapted to travel along a roadway upon which has been distributed an unset concrete mixture, insertible vibrators connected by ilexible shafts to rotary means, supporting means for said vibrators adapted to hold said vibrators in a rearwardly inclined position in said concrete mixture during vibration and forward movement of the carriage and also adapted by rotation to withdraw and insert the vibrators in the concrete, means for rotating said support, a finishing plate positioned on the concrete surface above said inclined vibrators in their fully inserted position and adapted to be dragged by the carriage over the surface of a vibrating portion of the concrete.

4. In a road paving machine, a carriage adapted to travel along a' roadway upon which has been distributed an unset concrete mixture, insertible vibrators, actuating means for said vibrators, supporting means for said vibrators and actuating means attached to said carriage and adapted to hold the vibrators within the concrete mixture during vibration and forward movement of the carriage and to withdraw or insert the vibrators in the concrete, means for rotating said support, a strike-off bar attached to the carriage across the roadway and rearwardly of the point of insertion of the vibrators, and a finishing plate positioned rearwardly of the strike-off bar and adapted to be dragged by the carriage over a vibrated portion of the concrete.

5. In a road machine, a carriage adapted to travel along a prepared roadway upon which has been distributed an unset and uncompacted concrete mixture, partly submergible tubular vibrators inclined downwardly and rearwardly relative to the forward end of themachine and adapted to be moved in this position through the unset concrete, means for actuating said vibrators, supporting means for said vibrators and actuating means adapted to move in a circular path perpendicular to the roadway surface, the vibrators being disposed tangentially to this circular path so that at the lower end of the path the vibrators are in inclined position within the concrete and at the upper end of which path the lowest portions of the vibrators are entirely out of and above the roadway, means for moving the support through said circular path, a crosswise top-'leveling strike-ofi bar rigidly attached to said carriage at a position rearwardly of the points of entry of said vibrators into the concrete, and'asurface nishing plate extending transversely between the margins of said roadway adapted to be dragged over the vibrated concrete at a position substantially directly above the lower end of the vibratory means and rearwardly of the strike-off bar. t

6. In a road paving machine adapted to travel along a prepared roadway upon which has been distributed an unset concrete mixture, a carriage, a pluralityof encased rotary vibratory mechanisms, means attached to said carriage for raising and lowering said vibratory mechanisms into and out of the unset concrete, attaching means for said encased vibratory mechanismsto said raising and lowering means including a non-rigid connection between said encased mechanism 'and said means for raising and lowering adapted to prevent the vibration of said raising and lowering means, rotary means for actuating said vibratory mechanisms, a crosswise strike-off bar rigidly attached to the carriage of said machine and adapted to roughly level off the top surface of the vibrating concrete mixture between said vibratory means and said strike-off bar, and a surface finishing plate extending transversely between the margins of said roadway adapted to be dragged over the vibrating concrete at a position substantially directly above the lower end of the vibratory means and rearwardly of the strike-oir bar.

7. In a road paving machine adapted to travel along a prepared roadway upon which has been distributed an unset concrete mixture, a carriage, a' plurality of encased rotary vibratory mechanisms, lever means attached to said carriage for inserting and withdrawing said vibratory mechanisms into and out of the unset concrete and for holding said vibratory mechanisms in inclined position downwardly and rearwardly of the front ofthe machine, attaching means for said vibratory mechanisms to said lever means including a non-rigid connection between said encased mechanism and said lever means adapted to prevent the vibration of said lever means, rotary means for actuating said vibratory mechanisms, a crosswise strike-olf bar rigidly attached to the carriage of said machine and adapted to roughly level oi the top surface of the vibrating concrete mixture between said vibratory means and said strike-off bar, and surface iinishing plate extending transversely between the margins of said roadway adapted to be dragged over the vibrating concrete at a position substantially directly above the lower end of the vibratory means and rearwardly of the strike-off bar.

l ENOCH BERG JORGENSEN.