US1780904A - Concrete curbing - Google Patents

Description

NOV. l1, 1930. H, A BLANCHARD Y 1,780,904

CONCRETE CURBI NG Filed Feb. 15, 1928 i to m m and eth1/nu,

Patented Nov. 11, 1930 UNlrsn srATssl HYMEN A. BLANCHARD, BFFALO, NEW Yon-K CONCRETE CURBNG Application led February 15,!1928. Serial No.,254,54.4.

This invention relates to improvements in precast concrete curb sections which are intended to be laid end to end and interlocked with a backing composed of a hard-setting 5vplastic material such as concrete.

The principal object is to provide a curb section, the form of which permits the section to be easily and quickly placed in position against a plastic backing and insures an lo effective and frost-proof union with the backing when the latter has set without requiring the use of mechanical interlocking forms or attachments.

A further object is to provide a section 5 which while strong and durable may be readily and inexpensively manufactured.

Heretofore it has been proposed to provide curb sections which are so constructed as to have a positive interlock` with the plas- 20 tic backing of cement, concrete or the like, this feature involving a tongue and groove relation of special form which entails serious additional manufacturing expense and com.- plication. While such feature may effectively prevent any upward movement or displacement of the section, it does not certainly prevent an outward or separating displacement inasmuch as it is practically impossible to obtain an intimate union between the smooth surfaced section and the backing and such union as may be obtained depends on the form of the cooperating tongue and groove and is limited to these areas. The collection and freezing of moisture between the curb and backing may thus subject the curb sections to outward displacement or other destructive effects.

The present invention consists mainly in providing a section having throughout the whole or the major area of its rear face a series of adjoining projections and depressions delimited thereby and having roughened faces, these projections and depressions being of such degree and extent that their roughened faces present sensible gripping areas for cooperation with the cement backing. These projections and depressions are preferably provided by roughening the rear face of the section in simulation of the 50 chipped face of a building rock. A face of this character unites so Vintimately-2A with the backingas to secure the section against displacement in any direction Whatever and to forni, a union which is absolutely Vfrost or moisture proof. n' At lthesame time the-sec,- tion maybe manufactured substantially as cheaply as an ordinary section, the grippingv face e-ectv being produced by molding or casting. f j

' An embodiment off the invention is illustrated vin the accompanying drawings, wherein: Y

Figure ll is a perspectiveview of the rearofifone of the curb sections.

Figure 2 is a cros'sfsectional View ofthe curb as it appears when'fse't in place.

The sections as 1, arecast or moldedli'n Such dimensions or cross sectional' formv as Vmay be desired. The rear face of each section is formed to have an upper smootlisurfa-ce 2* and a lower roughened surface 3 fof special form, the latter being ofV greater extent than the former.V The surface 3 is characterized by the adjoining projections anddepressions above" described. These may be ofregu'lar': form and arrangement or they'may be of irregular vform and ,arrangementln any'- case their facesl are rough so as to present a'multiplicity' of gripping points distributed overy sensible angularly extending areas.v As showny and preferred the surfacejsimulate-s thepsurface off a rough building rock, that is'tosay, it is formed with a multiplicityiof elevated and depressedfportions or irregularl form` and arrangement and rough; finish. The very natureof the gripping portion pro;

vides a clear li'nev of demarcationbetween the i smooth surface 2 and the rough-surface 3 and this line is preferably made substantially straight and'pa-rallelwith the'top o f the curb4 sectioni to" facilitateinspection. The siinplicity of the form ofthe secti'onasawhol'e, facilitates 'the mold-ingoperation and yenables the sectionsto. bemianufactured quickly Vand at a lowcost v f The curb sections are set upon aplastic bed of concrete as 4 and are held in place by a hard-setting plastic backing, 5, the upper surface of which is preferably sloped as shown. The sections l are placed upright on ,f no

f placed over thebacking or y thebed 4 with their roughened surface 3 in intimate 'contactjthroughout its extent, with theY backing 5 and this position maintained l whlethe concrete vof the loedand backing is kallowed to set. Aftertheconcretejhas set,k

and has been inspected,v a dirt lfilling may be lirni as' to prevent displacement in yanyl direction and so intimate Vasfto render the same 'moisture-proof; The 'union'j-is 'further in.

sured againsttheaaccess of `inoistureloy the Y Y provision of the sloped upper surfaceor` the extension 5 which functions to .drain away any moisture that seepsalonglthewrear of the smooth port-ion 2 of thek section.V

v.In thi-s'class of work, Vthe vertical yextent of .j Y the backing is generally specified, and tofa# cilitate the inspection of the work the rough*V surface S'isrprefer'ably made offan extent such Y thatitrwill correspondto the specified extent of the vbacking in each particular case. Thus when-theqwork completecL-thebacking will extend up to the lineof `demarcation between the smooth surface 2v andthe rough surface v 3 onlyif the backingis of the specified eXtent.

As a result of thisfeaturethe inspectoris not I' required to measure the hacking but may de-y Y *Y termine -if'it is oftheprop yr extent bya merer l glance at the completed work.

y 4eY yper edge in order to drainawav thatY might seep-past the -smoot 1 Having described my invention; I claim:

. HAV precast curb section adapted'tobe united s with a ,hard settingplastic backing of speci-U fied vertical'extentcomprising a body formed.. of concrete andhaving its rear face formed,

Withy an'uppersrnoothpsnrface and a lowerI rough surface, the latter vbeing'characterized f by adjoining projections and depressions de- 'f limited therebyandbeing of the same vertical extent vas the backing, said upper' and lower surfaces providing aline of demarcationwhich marks the upper andlo'wer Vlimit of c Y the rough surface whereby whenthe rough.

surface: is placed inzcontactgwiththe back-'- ing,V the latter will extend at least upto said Vline of demarcation, the said backingfbeing..

sloped downwardly away from its `front up-v the ,curb ysect-ion.

` testimony whereofjllhereby ABLlANcHARD.

e a concrete'side `walklaidin place as shown.Y n j ,Y VIn lthis V'manner an effective union is ob- K- `tained betweentlie parts. The surface 3 for c thepurp'0s'e of. its efectiveunion with the c e 'backing-1 5 does'not require any undercutting .Y

" orV positive interlocking with said Ybacking kinasrnuchfas notwithstanding the'absence of ,afpositive interlockthe unionk formed is so any (water portion of s

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