US1443221A - Nonconducting covering for boilers and other vessels - Google Patents

Description

J. HAWKRIGE ET AL jmmwm NoNccNDucT 1 NG COVERING FOR Bol LERs AND OTHER Vassrsa F1 LED Nov.

NoNccNDUcTING Covsieme FOR BolLERs AND OTHER VassgLs,

FILED Nov4 3.

1921. 2 SHEETS-s HEET 2 JUSEPH HAWKRIDGE, DAVID RGBERTSON, AND CHARLES JESU NAIRNE, OF LONDON,

ENGLAND.

NONCONDUCTING COVER/ING FOR DOILEBS AND OTHER VlESSElLS.

Application filed November 3, 1921. Serial No. 512,683.

To all whom it may concern:

Be it known that we, JOSEPH HAwnmnon, Devin RonnTsoN, and CHARLES JnsU NAiRNn, all subjects of the King of Great `lritain` all residing in London, England, have `jointly invented certain new and useful improvements Relating to Nonconducting Coverings for Boilers and Other Vessels, of which the following is a specification.

The invention consists in improvements relating to fire-resisting coverings or laggings for preventing the passage of heat out of or into boilers or other vessels.

According to the invention, millboard tubes of asbestos or of other suitable fireresisting material are inserted in slabs composed of fibres of similar material and covered by a wrapping of woven libres also of the same material.

rl`hese tubes are of any required number and vary in diameter to suit the thickness of the mattress and by the air spaces provided improve the non-conducting property of the covering.

ln the usual practice the coverings have been made in sizes to extend over large surfaces, but their ldimensions render it dif ficult to place and keep them in position and when repairs are necessary the lagging is often torn and rendered unfit for further use. ccording to the invention, these drawbacks are obviated by making the coverings of slabs of comparatively small size, for example about a foot square, which are easily manipulated and can lbe securely linked together by means described below.

Metal sheets suitably interlocked are provided to protect the fastenings of the coverings, more particularly at places, such as the tops of the boilers, where they are liable to be trodden on.

In the accompanying drawing which represents an example of a covering according to the invention, Fig. 1 is a view showing two slabs connected together, Fig. 2 is a section on the line Q-j-Q of Fig. 1, Fig. 3 shows two slabs joined together in a slightly modified manner; Fig. 4: is a section on line 1--4 of Fig. 3. j

Referring to Figs. 1 and 2, A1, A2 are two slabs of asbestos-filled fibre enclosed in a woven wrapping of the same material; B

are tubes of asbestos mill board containing air and enclosed in the wrapping; U are hooks provided on wires D secured in any suitable manner to the slabs nearthe edges of the latter and adapted to engage with the similarly arranged wires D1 of the adjacent slab. An overlapping portion E of the wrapping covers the joint between two slabs which are preferably bevelled as shown.

Figs. 3 and l show a modified method ot' attaching two slabs'Al, A2. V F is a. rectangle of wire secured by thin wires G to the wrapping of the slab A1; lH are metal bands of the form shown in Fig. 4f connect-ing the slab A1 with the slab A2 by a hinged joint. The end slab at each side of the boiler may be fastened to an angle iron by *similar means. T he wire F also serves to prevent direct contact between the slabs and the? .Y

boiler' plating and provides a thin layer of air between these parts which lessens the thermal conductivity and allows any moisture deposited on the plating to escape. The hinge joints may be replaced by copper or other wire, lacing together the adjacent wires.

Metal sheets 'I cover theI joints, each sheet being bent back upon itself at its ends to engage with the ends of the next adjacent sheet as shown.`

Having thus described the nature of the said invention and the best means we know of carrying the same into practical effect, we claim:

1. A boiler lagging comprising fibres of fire-resisting material of low thermal conductivity, tubes of a material having similar properties inserted and retained within said fibres and a wrapping of similar material enclosing said fibres.

2. A boiler lagging consisting of slabs of asbestos fibre, tubes of asbestos inserted in said slabs and a wrapping of felted asbestos fibres enclosing said slabs.

3. A boiler lagging comprising small slabs of asbestos, tubes of asbestos inserted in said slabs, wires secured to said slabs and metal hooks forming hinged joints con necting said wires on said adjacent slabs.

4. A boiler lagging comprisin small slabs of asbestos, said slabs being evelled at the edges, tubes of asbestos inserted in said slabs, wires secured to.said slabs and metal hooks forminghinged joints connecting said wires on said adjacent slabs.

5. A boiler lagging comprising small slabs of asbestos, wires substantially of rectangular form secured to said slabs and metal strips with hooked ends connecting said Wires on adjacent slabs.

6. Aboiler lagging comprising small slabs of asbestos, Wires secured to said slabs, metal hooks forming hinged joints connecting said wires on said adjacent slabs, and metal sheets hooked together covering said .'oints.

7. A boiler lagging comprising small slabs ofI fire-resisting material of low thermal conductivity` tubes of a material having! silnlilarproperties inserted in `said. slabs. wires of substantially lei'tangulai forni ecui'ed to said slabs and metal sti-ips with 15 hooked ends connecting said wires on'adjacent slabs.

ln testimony whereof we have signed 0111 naines to this specification.

JOSEPH HAXVKRIDGE. DAVID ROBERTSON. CHARLES JESU NAIRN.

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