US867852A

US867852A - Device for laying concrete pavements.

Info

Publication number: US867852A
Application number: US35971707A
Authority: US
Inventors: George W Switzer; George F Switzer
Original assignee: HENRY G CAMPBELL
Current assignee: HENRY G CAMPBELL
Priority date: 1907-02-28
Filing date: 1907-02-28
Publication date: 1907-10-08
Anticipated expiration: 1924-10-08

Description

No. 867,852. PATENTED OCT. 8, 1907. G. W. & G. F. SWITZER. DEVICE FOB. LAYING CONCRETE PAVEMENTS.-

APPLICATION FILED FEB. 28, 1907.

INVENTR GEoReEWSvvq-,ZER

Afro/Mfrs No. 867,852. PATENTED 00118, 1907. G. W. & G. P. SWITZER.

DEVICE FOR LAYING CONCRETE PAVEMBNTS.

APPLICATION FILED 11x28. 1907.

2 SHBETSSHBET 2.

UNITED. s'rsrns Parr" NT OFFTGR GEORGE W. SWITZER AND GEORGE F. SWITZER, OF SALISRIIRY, NORTH CAROLINA, ASSIGNORS OF ONE-THIRD TO HENRY G. CAMPBELL, OFSALISBURY,\NORTH CAR- oLINii.

To all whom it may concern:

Be it known that we, GEORGE W. SWrrzER and GEORGE F. SWITZER, both citizens of the United States, residing at Salisbury, in the county of Rowan and State of North Carolina, ha/ve inventedanew and useful Improvement in Devices for Laying Concrete Pavements, of which the following is a specification.

Our invention is in the naturelof a novel device Ifor laying concrete pavements.

In the ordinary method of laying concrete' pavements a base of broken stone, orgravel, sand and'cement, is first laid within suitable marginal mold bars and rammed and a top dressing of mortar composed of a rich mixture of sand and cement is laidover the same to form the smooth face. leveled up roughly with what is known as a "float and, after being allowed to harden some, is then troweled to ay smooth face.` Both the float and trowel are hand tools and the work of nishing is so slow and 1aborious that it frequently happens that the concrete mixers will get along in advance of the finishers, thus involving either a loss of time, or the too great hardening of the cement in advance ofthe finishers.

Our invention is designed to provide a device for more rapidly floating and troweling the surface to a finish and also at the same time laying it off into panels with margin lines and beveled edges, such as are usually employed and which take a great deal of time and carieful work.v

Our invention consists in the novel construction and arrangement of the device which we will now proceed to describe with reference to the drawings, in which Figure 1 is a perspective view ofa stretch of concrete pavement in process of being laid by our device.

Fig. `2 is a vertical longitudinal section through Vthe same. Fig. 3 is a vertical section taken longitudinally pavement are usually of broken stone, or grav el, mixed' with sand and cement, andthe top face and edges are of sifted sand and cement, of rich quality, appli'ed in the form of mortar and upon which our device is` designed to make the nish.- This finish consists of a smooth and true face and the dividing creases for separatingit into panels with margin or border'lines for the Specification of Letters Patent.

Application iiled February 28, 1907. Serial No. 359,717.

This top dressing is iirstv DEVICE FOR.LAYING CONCRETE PAVEMENTS.

Patented Oct. 8, 1907.

mortar has beeny applied to the base and' roughly leveled l i to the marginal mold barsY, ourtmachine is applied and is simply allowed to rest of its own'weight on the pavement and is dragged over the same.

The device is made in two separable parts. The first part A is the wooden fioat which isA a straight heavy bar .somewhat longer than width of the pavement toA be laid, but not long enough to extend beyond 'the mold barsY, so as to avoid coming in contact with any` pegs that may be driven outside the mold bars to hold them in place.

The float has a true, fiat plane on its lower side, about ten or twelve inches broad, and has at its opposite ends stout handles C `C by which it is dragged along. Near Ieach end oi the floaton the lower face and arranged transversely are cutting fins a a,'see Fig. 3, whichare a distance apart equ'alto the .width of the pavement to be formed and which preliminarily cut away the mortar at the edges to form the bevel edges 3 for the pavement and serve also to guide the float as it is dragged along.

The rear or trailing edge of the oat is beveled-on its upper surface to an acute angle and on this is laid a metal smoothing plate B which is perfectly ,straight along its lower edge and which gives the rst troweling effect on the mortar. This plate has downturned fianges b b at its ends which run in the grooves formed by the cutting fins a and thesel flanges b are slightly spread apart at the lower edges to cause them to give a bevel face smoothing effect to the edges of the pavement defining the margin of the same. The smoothing fplateB is of less length than the bar A and stops short of its ends and is adjustable to or from the pavement to a position below the bar A to cause its Iedge to press more or less upon the plastic mortar and for this purpose the vplate is formed with transverse slots b through troweling. effect.

I. the face. This' smoothing trowel plate is connected to purrpqge the'creaser is, mounted upon a fail/Crum stud i v top `of the end lof the creaser.- Bzy turning 11p-the nut' y machine, but if desiredtthe drag hars DD" may be dis.-

= -finishing at another. This allows a lapsepf time be-A 50.

' .tt may. oe allowed to set np to a moredesirable stiffhug,- define andgive the final smoothing effect to the l'line,t'o form the dividing crease 1. In narrow paveis transmitted by the lower edge of the plate B -below bar A to the plastic mortar in order to get a proper In the top of theiioat A are secured the eye bolts d to which are loosely connected two drag bars D D, which, at their rear ends, are'loosely coupled .to eye bolts d d secured the finishing device which is dragged behind the float.

The finishing device consists of a cross bar F to whose lower side is attached a smooth and true trowel plate E extending the full width of the pavement and having downturned flanges e e at the ends, see Fig. 4, which* beveled edges 3, while the-straight `trowel edge gives I the iinal smoothing to the surface ofthe mortar to form' triangular end blocks G G which ride upon the mold bars Y Y andhold up lthetrowel plate while the end `flanges e e guide it against displacement and prevent the triangular support Gironi slippingof t'hemold bars, which would mar the surface;

Centrally onthe finishing t'oolis mounted the dividing tool vor panel creaser l, lThis is a bent meta-l bar having a plow-foot V-shaped in cross' section, which plows into and creases the soft mortar along the middle ments there is but one of. these dividing creasers, but

where the pavement is' wider, there may be two or more according to the number of` panels which it' is wished to divide theaceinto.. To make a'deeper orb shallower crease, the plow end', of the ereaser is adjnstable up and down with an elastic pressure; and for this by means of anni; m andthe upper endrrestsupon a coil spring k won-nd about a stud having screw nut l on the 'spring' is compressed' and the lower` eridv of the creaser raised from the face of the pavement.

' On'the device, and trailingrtothev rear, are 'exihle' markerrods 13' which at .theirl'ower .ends exor margin lines' 2', v2 for the panels- Y All of the above named flnshing'operations' are done v'at one pass of the finisher, and infact both-the floating, troweli'ng and nishingare all doneat one pass ofthe connected andthe floating done" at one time and the tween stating and finishing inwhieh'th'e Cement morness forl'receiving the final facci For this independent use of the finishing device it is also provided with handlesvH, H.'

We claim ,1. A device for Alaying concrete pavements, consisting of a straight bar having a broad Hat base, o. narrower upper surface and abeveled rear edge with :in adjustable trowel affixed to said edge and also having handles st its opposite ends and downwardly projecting transverse ilus on the base side .of its opposite ends arranged to define the marginal edges-of the pavement and form guides.

2. A device for laying 'concrete pavements, consisting of a straight barhavlng handles at its opposite ends and downwardly projecting transverse fins on the lower side of its opposite ends arranged to denne Athe marginal edges of the pavement and an adjustable straight metal trowcl pla'tejattnched to the bar at one edge and capable of being extended below the bar to contact with the pavement to apply the necessary compacting andsmoothlng pressure on the plastic material;

3. A device for laying concrete pavements, consisting of a straight bar having handles at' its opposite ends and downwardly projecting transverse tins on the lower side of its opposite ends and a metal smoothing plate adjustably attached to the bar at one edge and extensible below the bar, and having at` the ends down-turned flanges for shaping the lside edges of the pavement.

4,. Adevice for laying concrete pavements, consisting of straight .bar having handles at its ppposlte ends and 'downwardly vprojecting transverse dns `at the lower side of its opposite yends, and s metal smoothing plate arranged along the -edge `of the' bar and means for adjusting said plate to `or from the pavement, said plate being oi? less length than, the bar and stopping short et each end of the Vbar.

5. A device -for laying concrete pavements, consisting of s. straight hat-bottom bar formingA a float and pro- -vlded with handles a-t; its ends, a second bnr with an lnfclined metal, edge having down-turned .ends forming a trowelv extendingbelow ythe bar and yseigiarablc coupling devices for lconnecting the two together for operation at .Oife-pass over the. pavement.

6. A' device forv laying concrete pavements, consisting of a sheet metal Jcrowel plate, guide blocks alt' the ends for holding it at an acute langle, handles for manipulating the same, a dividing ,creuser with plow-shoe at its lower end, and a plurality of marker rods, both attached to thc finishing `trowel and extending at their trailing ends to tend Below-the trowel edge and press into and mark the j' a point below the trowel edge.

soitface of the mortar 'to` form; the longitudinal border 7-.A device for leyngf concrgte pavements, consisting ofasheet metal 'trowel plate, guide* blocks :it the ends for holding. it at an acute angle, handles for manipulating ,.the`same, a dividing creaser attached to the trowel having a plow foot at its lower end and an adjustable und spring l seated connection et its upper end.

GEORGE W. SWITZER. GEORGE F. SWPTZER.

. Witnesses L T. J..MAUP1N,

MARY L. P'on'rns.