US2347149A - Air nozzle - Google Patents

Description

April 18,1944. F. H. CHIRGWIN 2,347,149

AIR NOZZLE Original Filed April 3, 1940 Patented Apr. 18, .1944

AIR NOZZLE Frederick H. Chirgwin, Los Angeles, Calif., assignor to B. F. Sturtevant Company, Boston, Mass.

Original application April 3, 1940, Serial No.

327,695. Divided and this application Novemher 8, 1941, Serial No. 418,430

2 Claims.

This invention relates to air nozzles and relates more particularly to air distributing nozzles and to methods of forming same,

This application is a division of my copending application, Serial No. 327,695, filed April 3, 1940.

In many air conditioned spaces, such for example, as in citrus plants and in textile mills, it

is the practice to project chilled air through ejector nozzles in the upper portion of the space, the movement of primary air through the ejectors inducing the flow of secondary air as recirculated air thus providing effective circulation as well as distribution. The ejector nozzles are usually formed from galvanized sheet iron and the moisture in the air condenses upon their surfaces and drips down upon the floors. Such nozzles have been insulated by placing thick, conical shaped cork nozzles over them but the expense has been great.

This invention provides a simple, relatively inexpensive air nozzle which avoids the objection of prior nozzles. In one embodiment of the invention, a pattern of the nozzle is laid out upon an insulating composition board of the type known as heat insulating wall board, a suitable one being formed from cellulose fibre such as bagasse. The pattern corresponds, of course, to a developed, unrolled nozzle. The board is cut into blanks corresponding to the pattern; are slitted along spaced converging lines; are then rolled in succession over one or more conical templates; wire is wrapped around each, and then after removal from the template, each assembly is dipped into hot tar which not only fills the slits and covers the wire but adds a pleasing glossy appearance.

An object of the invention is to reduce the cost of insulated air nozzles.

The invention will now be described with reference to the drawing, of which:

Fig. l is a plan view of an unrolled, slotted, nozzle blank formed from an insulating board;

Fig. 2 is an end view looking at the right hand end (facing the drawing) of Fig. 1;

Fig. 3 is a sectional view of one embodiment of a completed nozzle incorporating this invention, with section taken along the longitudinal center, and

Fig. 4. is a view showing a completed nozzle embodying this invention, connected to a supply duct.

The nozzle to be formed is a conical one, and

the developed pattern is laid out upon a cellulose insulating board, following which the blank 5 conforming to the pattern and shown by Figs. 1 and 2, is cut out. The equally spaced slits 6 are cut along lines converging to the apex of the cone which would be formed by extension of the lines, to a depth about three-fourths of the way through the board. The blank is then rolled up, preferably on a conical template having the correct proportions, and the wire I, shown in section by Fig. 3, is wound spirally around its exterior. The template is then removed from the nozzle and the collar 8 is then attached by the screws 9, in the inlet end of the nozzle. The assembly is then dipped into melted tar which forms the coating l0.

Fig. 4 illustrates how the nozzle is mounted to the supply duct I I by beading the end of the collar 8 at I2.

The tar l6 forms a smooth, glossy covering for the nozzle, causing it to appear as well as prior more expensive nozzles, and at the same time fills the slits 6, covers the wires 1 and binds the assembly together. While tar has been found satisfactory, other thermoplastic materials may be used.

While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not limited to the exact methods and apparatus described as modifications thereof may be suggested by those skilled in the art without departure from the essence of the invention.

What is claimed is:

1. An air nozzle comprising a conical shaped member of non-metallic, rigid, heat insulating material, a substantially cylindrical sheet metal member attached at one end to said conical member adjacent the large end thereof, and a binder layer of thermoplastic material on the inner and outer surfaces of said conical member.

2. An air nozzle comprising a conical shaped member of non-metallic, rigid, heat insulating material, a substantially cylindrical sheet metal member attached at one end to said conical member adjacent the large end thereof, and a binder layer of thermoplastic material on the inner and outer surfaces of said conical member and on the inner and outer surfaces of a portion of said cylindrical member at said end of said cylindrical member.

FREDERICK H. CHIRGWIN.

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