US169230A - Improvement in dryjng-kilns - Google Patents

Description

UNITED STATES PATENT OFFICE DAVID BONNELL, OF ST. JOSEPH, MICHIGAN.

IMPRovEME'NT |N DRviNG-KILNS.

Specification forming part of Letters Patent No. 169,230, dated October 26, 1875; application filed March 2:2, 1875.

To all whom 'it may concern Be it known that I, DAVID BONNELL, of St. Joseph, Berren county, and State of Michigan, have invented a new and useful Improvement iu Drying-Kilns, ot' which the following is a description:

This invention relates, in its nature, to a device for drying lumber and other substances by means of artificial heat, the object being to accomplishvthe purpose with greater etliciency and economy than has hitherto been done.

The accompanying drawing forms a part of this specification, and the letters of reference marked thereon indicate the parts referred to by a similar letter in the written part of this specitication, in which- A represents the furnace or heater 5 but this maybe any suitable device for heating air, and need not be describedin full here. B B represent induction-tubes. These tubes convey heated air from the heater to the dryingchamber O, entering said chamber at a point above midway of its height. This chamber may be of any suitable form of construction that will admit of being shut tight, and need not differ materially from drying-kilns in common use. E E represent eduction pipes. These pipes are placed at the bottom of the drying-chamber G, with their open mouths near the cent-ral part of the bottom, or may be extended over the entire bottom, in which case they should be perforated, so as to draw the air from all parts of the bottom of said chamber. The outer ends ofthe eductionpipes pass out through the Wall of the dryingchamber, and connect to the opposite sides of the case of the rotary fau F. This fan is of the ordinary construction of rotary exhaustfans, and is driven by any suitable motive power. The office of this fan is to exhaust the humid air from the drying-chamber, thus producing a partial vacuum, which will be supplied by hot dry air through the inductiontubes B B, and causing a -downward current of hot air through the drying-chamber. The constant discharge of humid air through the eduction-pipes will give greater effect to the incoming hot air, and the fan F will answer the threefold purpose of producing a draft through the heater, a downward current of hotair through the drying-chamber, and of expelling the humid air from the bottom.

Having thus describedl my invention in the most exact terms that I can give, what Iclaim as new, and desire to secure by Letters Patent, is-- The drying-chamber O, having the induction-tubes B B, introduced at a point above midway of its height, and provided at the bottom with the education-pipes E E, in combination with the fan F, as and for the purposes hereinbefore set forth.

DAVID B'oNNELL.

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