US1220292A - Paving-brick. - Google Patents

Description

UNITED STATES PATENT oEEIoE- JOSEPH WADE TUCKER, OF KISSIMMEE, FLORIDA, AND WILLIAM A. McCOOL, OF BEAVER FALLS, PENNSYLVANIA. I

PAVING-BRICK.

No Drawing.

To all whom it may concern:

Be it known that we, JOSEPH WADE TUCKER and WILLIAM A. MoCooL, citizens of the United States, residing, respectively, at Kissimmee, in the county of Osceola and State of Florida, and Beaver Falls, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Paving-Bricks, of which the following is-a specification.

This invention relates to bricks, blocks or the like, for paving or other purposes, and has for its object to provide bricks or blocks of low cost, which will afford a cushioning or noise and shock deadening traffic surface,

which are sufficiently strong, durable and.

wear-resisting to perform their intended function in an efficient manner,-which are waterproof and durable, and which are unaffected by any degree of heat to which they are likely to be subjected, or by saline solutions, acids, or other chemical. agencies, the last-named characteristic making such bricks or blocks especially suitable for paving purposes in stables, shops, and other.

places in which such destructive agencies are frequently encountered.

The foregoing and other objects of the invention will best be understood from the following detailed description of the manner in which the same may be carried into effect.

In accordance with said invention the bricks, blocks or the like are composed of an aggregate comprising a comminuted, absorbent organic material treated with a suitable substance which impregnates the same, and a binder which, under heavy pressure, unites said aggregate into a solid mass. Said absorbent material may be any nonresinous wood but preferably consists of comminuted cypress wood, either in shredded form, produced from scrap, or as sawdust, this material having been found especially suitable for the purpose by reason of its cheapness incertain localities, its durability, and its substantial freedom from pitch, resin or other substances which might interfere with its thorough impregnation. The substance with which said absorbent comminuted wood is impregnated, as also the binder by which it is united, are both prefhc Specification of Letters Patent. Patented Mar, 27,- 1917.

\ Application filed November 20, 1916. Serial No. 132,325.

residues comprising a mixture of asphaltums of different melting points and being left after the extraction from the crude 011 of the more-volatile components, such as gasolene, naphtha, kerosene, etc.' These residues are subjected to a fractional distillation (preferably at a temperature of from .wood is thereafter thoroughly mixed with a sufficient quantityof the heavier hydrocarbon material, or high point asphaltums, also in a melted condition, to be thoroughly coated therewith. Preferably only a sufiicient quantity of the heavier asphaltum is employed to coat the aggregate completely and to bind the same firmly together without excess. Suitable proportions have been found to be about 82 parts of the impregnated comminuted cypress wood to about 18 parts of the binder, although these proportions are capable of considerable variation. The comminuted wood thus impregnated and thoroughly mixed with the binder, by any suitable means, is molded into blocks or bricks of suitable shape and size and under a heavy pressure in a hydraulic or other suitable press of any well-known character.

A brick or block made,- as above described has been found admirably to fulfil all of the conditions, and to possess all of the desirable qualities, heretofore referred to. In order to meet said conditions it is necessary that the comminuted wood be thoroughly impregnated with a material which will render the same waterproof and that it be bound together by a material which will afford the necessary strength and durability and which is not readily inflammable or injuriously affected by heat. Any hydrocarbon or other similar material capable of fulfilling the first-named conditions has been found in practice to be toov light'to the other hand, it has also been found in practice that any hydrocarbon heavy enough to serve as a suitable binder is too heavy to' penetrate the pores of the wood but merely coats the surfaces of the particles of the aggregate and binds them together. In such case the wood particles are not properly impregnated and waterproofed by such heavy binder.

In the brickor block above described the lighter asphaltums serve efiectually to impregnate and waterproof the comminuted wood, while the heavier asphaltums serve as a highly efficient binder. Moreover, it is found that, when the impregnated comminuted wood is mixed with the binder and subjected to pressure, such lighter and heavier asphaltums display a strong aflinity for one another and recombine to form a more or less homogeneous compound which entirely permeates the aggregate and binds the same together; which is strong and durable; which is capable of resisting a heat of 200 F., or more; and which is not affected by saline solutions, acids, or other destructive chemical agencies.

The terms bricks and blocks as herein used are to be taken as broad and general in their meaning and to include paving or structural elements of any form or size suitable for the uses to which they are to be put, and capable of being manufactured as above described.

The process above described, whereby the bricks or blocks herein claimed are produced, forms the subject-matter of another application filed by us simultaneously herewith, No. 132,326.

Having thus described our invention we claim and desire to secure by Letters Patent:

1. A brick, block, or the like composed of .comminuted non-resinous Wood impregnated with a'relatively light or thin asphaltum and united into a solid mass by a relatively heavy asphaltum.

2. A brick, block, or the like composed of comminuted non-resinous wood impregnated with a relatively light or thin asphaltum and united into a solid mass by a relatively heavy asphaltum in a proportion of about 18 parts of said relatively heavy asphaltum to about 82 parts of the said impregnated comminuted wood.

3. A brick, block, or the like, composed of comminuted cypress wood impregnated with a relatively light or thin asphaltum and solidly united by a binder consisting of a relatively heavy asphaltum.

4. A brlck, block, or the like, composed of comminuted cypress wood impregnated with a relatively light or thin asphaltum and solidly united by a binder consisting of a relatively heavy asphaltum, in a pro portion of about 18 parts of said relatively heavy asphaltum to about 82 parts of th said impregnated comminuted wood.

5. A brick, block, or the like, composed of comminuted cypress wood treated with the residue of a mineral oil having an asphalt base and from which oil the more volatile components have been extracted, said comminuted wood being impregnated with the lighter asphaltum of said residue,

and being united into a solid mass by a' binder consisting of the heavier asphaltum which combines with the lighter asphaltum with which said comminuted wood is impregnated, thus forming a solid homogeneous block.

In testimony whereof we aifix our signatures.

JOSEPH WADE TUCKER;- WILLIAM A. McOOOL.