US695614A - Boiler. - Google Patents

Description

No. 695,6l4. Patented Mar. l8,- I902.

c. F. LAPE.

BOILER.

(Application flied Aug. 10 1899.) (No Model.)

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UNITED STATES T N OFFICE- CHARLES F. LAPE, OF SAN BERNARDINO, CALIFORNIA.

BOILER.

SPECIFICATION forming part of Letters Patent No. 695,614, dated March 18, 1902.

Application filed August 10, 1899. $erial No..726,776. (NdmocleL) T0 to whom it may concern.-

Beitknown that 1, CHARLES F. LAPE, a citizen of the United States, residing at San Bernardino, in the county of San Bernardino and State of Califorhia,have invented certain new and useful Improvements in Boilers, of which the following is a specification.

My invention relates to that class of boilers known as flue-boilers, in which tubes or flues are used for the purpose of conducting heat through a body of water and heating the same to such an extent as to form steam; and it relates particularly to the means by which the tubes are connected to the tubesheets, all of which will more fully hereinafter appear.

The object of my invention is to provide a simple, economical, and efficient flue-boiler.

Afurther object is to provide meansby which the tubes or lines and tube-sheets may be connected together, so as to minimize the dangerous and objectionable burning of the ends of the fiues; and the invention consists in the features, combinations, and details of construction hereinafter described and claimed.

The accompanying drawingis substantially a full-sized view of a section of a tube-sheet, showing my improvements in engagement therewith.

In the art to which this invention relates it is Well known that the tubes or fines in tubesheets are connected together by having the ends of the tubes project from the tubesheets and then roll over on the same and on the outside thereof. The projecting ends of these tubes or flues are liable to be burned by the intense heat of the gases and fuel,which at times reach almost to the point of incandescence. This burning takes place owing to the remoteness of the ends from the water, and before the heat is transmitted to the water the ends are liable to be burned. My invention therefore is intended, primarily, to remove these objections by providing a b'iler in which the tube-sheets are countersunk and the ends of the tubes rolled over, so as to engage withthe tube sheet at a point beneath the face thereof and as close as possible to the water-chamber of the boiler, all of which will more fully hereinafter appear.

In constructing my improvements and using them in connection with the ordinary steam-boiler I provide a tube-sheet A with a plurality of perforations B of substantially the tube-sheet and the boiler-flue.

' the same diameter as the tubes which are to be engaged therewith. are countersunk, as at b, on the outside of These perforations the sheet and for a depth of nearly half the thickness of a sheet. vided with athimble 0, formed of soft copper, in which is inserted the tube or flue D, so that its end at may be rolled over and flanged to engage the tube-sheet and press the copper against the same to calk the space between The tube is then expanded in the usual manner, as at 01, so as to firmly set and fix the tube in its engagementwith the tube-sheet. By this construction and arrangement it will be seen that the end of the tube is inserted below the face of the tube and in close proximity to the water-chamber of the boiler, so that whatever heat contacts the same may be quickly absorbed and transmitted or conducted to the water-chamber as efficiently as possible,

thus minimizing the danger of burning the boiler-fiues. I claim- They are then pro-' Ina steam-boiler, a tube-sheet provided with counterbored perforations, each perforation having its counterbore extended inward and decreasing the thickness of the tubesheet around the perforation incombination with a tube for each perforation each tube having its end entered into .and passing through the perforation to lie within the coun: terbore and Within the plane of the outer face of the tube-sheet, a thimble of calking metal around the end of each tube, an outwardlyextending flange formed on the outer end of each tube and its surrounding thimble en bore, and a bead turned out from the body of gagingthe end face or wall of the counterthe tube adjacent to the tube-sheet and en gaging therewith for locking and securing the end of the tube in thetube-she'et with the extreme outer end in the space of the counterbore in close proximity to the interior of the boiler and the water therein to have this CHARLES F. LAPE.

Witnesses:

CHAS. G. LUNDHOLM, ROBERT CUNNI GHAM.

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