US 7,097,448 B2
BRIEF DESCRIPTION OF THE DRAWINGS
FIELD OF THE INVENTION
A gas lamp which utilizes combustible gas burned as a 5 linear vortex to produce light along a substantial flame length for illumination, comfort, mood, decoration and large scale art.
BACKGROUND OF THE INVENTION 10
Combustion flames have historically been used for their radiant and convective heating effects, and for illumination. Hearth fires, campfires, and fire rings are classical examples. The combustion of wood, coal, natural gas and bottled gas 15 is generally the source of the flame.
The shape of the flame is rarely of interest in most applications where warmth, mood and "coziness" are the principal objectives. The flame itself usually will be in a confined (but vented) region, and much of the heat from the 20 reverse side of the flame will be re-radiated by surrounding surfaces. However, much of the light and some of the radiant heat will be dissipated or hidden from view. In addition, the height of the flame may be quite low, and its illumination effect will be minimized. Gas lamps are not usually tall 25 enough to provide effective illumination. As a consequence, most gas lamps, lanterns, or "tiki torches" are mounted on poles or suspended from an overhanging support, which limits their placement.
This invention provides an attractive, surprisingly tall 30 disciplined flame as a generally cylindrical vortex, providing an extended light source useful for decoration and for illumination and heating. It is a safe structure. The flame is inside a transparent shield which remains surprisingly cool to the touch. Furthermore the inside of the shield is kept 35 clean by the flame and the air flow.
The lamp of this invention is very inexpensive. It comprises sections of curved plastic material that can even be folded neatly for storage or shipment, but which springs back to its curved shape. It is elegantly simple, does not 40 require a blower to create the swirling flame, and needs no side support.
BRIEF DESCRIPTION OF THE INVENTION
A gas lamp according to this invention comprises a plurality of axially-extending curved channel-like sections that are mounted parallel to one another to form a shield. Each section has an axially extending edge that overlaps the wall of its neighbor so as to form ports between them which 50 extend axially along the sections and open tangentially into the combustion region inside of their assembly (the shield).
At one end of the assembly of the sections, a gas orifice is disposed which faces axially into the chamber. It need not be a classical burner, because air is supplied through the 55 ports. A simple orifice or a perforated plate will usually suffice
As the flame burns and rises, air is drawn into the chamber through the ports with a tangential movement. This results in a rotary swirling motion of the gases in the chamber. As the 60 flame rises, air is brought into the chamber along the axis to feed the uncombusted material, thereby generating a flame that extends for a considerable axial length. It is this extended flame that is the objective of this invention.
The above and other features of this invention will be 65 fully understood from the following detailed description and the accompanying drawings, in which:
FIG. 1 is a side elevation showing the presently-preferred
embodiment of a gas lamp according the invention.
FIG. 2 is a cross-section taken at line 2—2 in FIG. 1;
FIG. 3 is a cross-section taken at line 3—3 in FIG. 2, and
FIG. 4 is a cross-section taken at line 4—4 in FIG. 2.
DETAILED DESCRIPTION OF THE
The presently preferred embodiment of this invention is shown in FIG. 1. A gas lamp 10 rests on any suitable support 11 such as a table, fireplace, or wall. A source 15 of combustible gas is supplied under pressure through a conduit 16. A control valve 17 admits or prevents the admission of gas, and controls its rate of flow. A mixing burner or mixing nozzle is not needed. The air is supplied through the gaps in the wall structure.
The lamp is shown in an upright position, with its central axis 18 vertically oriented. Exact upright orientation is not necessary. It may be slanted downwardly, up to about 45 degrees from the vertical. Beyond that, the advantages of improved convection are lost, and the lamp is not as reliable.
This lamp is characterized by its elegant simplicity. It may be formed by as few as two parts, and usually will be. It is possible to use three or more, but there is no particular advantage in doing so, although it is within the scope of this invention.
The shield 20 of this invention is formed by two axially extending channel-like sections 21,22. These sections are preferably identical, and are arcuate in cross-section. They may be supported in grooves (not shown) in the support, or may be otherwise held in position together as preferred.
It is convenient for the sections to be identical. Then only one size and shape needs to be manufactured and kept in inventory. In the most convenient arrangement, both of them are axial sections of a cylinder.
For example, section 21 has a center 25, a curved body 26, and a pair of end edges 27,28. The ends are parallel to one another, and to axis 18. Section 21 has a wall thickness 29, which is quite thin, an outer wall 30 and an inner wall 31.
Similarly, section 22 has a center 35, a curved body 36, and a pair of end edges 37,38. The ends are parallel to one another and to axis 18. Section 22 has a wall thickness 39, which is quite thin, an outer wall 40 and an inner wall 41.
Importantly to this invention, as shown in FIG. 2, the respective ends of both sections, for example end edges 27 and 28, extend onto the same side of a diameter 42 that is to say, the arcuate dimension of each of the sections exceeds 180 degrees.
Again as will be seen in FIG. 2, centers 25 and 35 of sections 21 and 22 are offset from one another by a dimension 45. This offset dimension is approximately aligned with the mid portions of the sections.
As a consequence, two axially-extending air ports 50,51 are formed between areas of the two sections. In FIG. 2, notice that end edges 27 and 38 of sections 21 and 22 have passed over one another and that a region 52 of sections 21 and region 53 of section 22 face one another to form the gap-like port. A similar port 54 is formed at the other end edges. It will be observed that the edge section which is outermost at one port is the inner-most at the other.
This arrangement establishes two ports for air which are tangentially directed in the same rotational sense. The heat