GB2031384A - Packing Units for Gas Mantles - Google Patents

Abstract

A packing unit for an individual incandescent gas mantle of the kind employing a screwed ring has a skirt 4 which merges into a cylindrical boss 5, the outer diameter of which corresponds to the female thread diameter of a mantle screwed ring and on the outer periphery of which are mounted several protuberances 6 in such a manner that they form vestigial parts of a male thread correspond to the female thread of the screwed ring. With the mantle supported on the boss 5, a cylindrical sleeve may be applied and located by a lip 8, a cover closing the upper end of the sleeve. <IMAGE>

Description

SPECIFICATION Improvements in or Relating to Packing Units for Gas Mantles The present invention refers to packing units for packing individual incandescent gas mantles of the kind employing a screwed ring which units are in the form of a cylindrical sleeve with a transparent top and bottom. Hereinafter such packing units will be referred to as "of the kind described".

The individual packing of incandescent gas mantles in cylindrical sleeves or square cases has been known for a long time. It has the purpose of protecting the incandescent gas mantles before use from dust but also above ali from mechanical damage during transport or storage.

The cylindrical sleeve, especially, has been used for decades as a form of packing for many incandescent gas mantles particularly since it is simpler and better value in use than a square box which has a relatively complicated formation of its inner space to ensure safe seating of the sensitive incandescent mantle.

With the cylindrical sleeve firm seating of the incandescent gas mantle therein is obtained in various ways. There are cylindrical sleeves with a paste ring stuck thereto on which the feet, usually three, of the ceramic ring of the incandescent gas mantle are supported. Often a second narrower sleeve is inserted in the cylindrical sleeve, this serving as a support for the feet. In both cases the inner diameter of the sleeve is matched to the outer ring mounting diameter of the incandescent gas mantle ring.

In the most frequently used form of cylindrical sleeve its upper edge is shaped into a projection in which there are recesses corresponding to the feet of the mantle and the feet are inserted into these recesses.

An incandescent gas mantle is, however, only suitable for packing in one of the three described sleeves if the diameter of the ring body is substantially greater than that of the connecting projection of the ring so as to ensure that the mantle gauze does not protrude over the outer diameter of the ring body and thus come into contact with the wall or the projection of the sleeve and become damaged. This is, however, the case with screwed-ring mantle whose construction features and technical manufacture properties only admit a very steep passage of the ring body at the connection projection. Such a gas mantle can then only be accommodated in a rectangular and expensive individual packing.

It is an object of the invention to provide a packing unit suitable for the individual packing of incandescent gas mantles which makes possible the simple and safe reception of an mantle with a screwed ring and its accommodation in a cylindrical sleeve.

Accordingly, the invention consists in that the base is converted from a cylindrical socket connected at its base into a peg which is also cylindrical, the outer diameter of which .corresponds to the inner thread diameter of the screw ring and on the outer circumference on which are mounted several knubs in such a way that they are part-pieces of an outer winding corresponding to the inner winding of the screw ring.

The advantages obtained with the invention consist especially in that an incandescent gas mantle with a screw ring can be packed by simple means in a round sleeve without the incandescent mantle gauze of the incandescent gas mantle being damaged.

In order that the invention may be more clearly understood, reference will now be made to the accompanying drawings which show one embodiment thereof by way of example and in which: Fig. 1 is a view of a packing unit according to the invention partly cut away, Fig. 2 is a view of the base part of the unit partly cut away, Fig. 3 is a top view of the arrangement of shown in Fig. 2, and Fig. 4 shows a cover part for the unit.

Referring now to the drawings, as can be seen from Fig. 1 the packing unit consists essentially of a circular sleeve 1, a base part 2 and a cover part 3.

The base and the cover are moulded from an easily deformable plastics material. The base 2 is formed from a disc with a lip 8 to which a cylindrical skirt 4 is connected without a seam and which further merges into a boss 5 which is also cylindrical, and the outer diameter of which corresponds to the inner diameter of the screw ring of the mantle. Several projecting protuberances 6 are so arranged on the outer periphery of the boss 5 that they form vestigial parts a female of thread corresponding to the male thread of the skin ring (Figs. 2 and 3). The flat part 4a of the cylindrical skirt 4 connected to the boss 5 forms a resilient abutment with the screw-on incandescent mantle ring which presses the ring thread firmly against the protuberances 6 and thus ensures a firm seating of the incandescent gas mantle on the base 2 (Fig. 1).

The cylindrical part of the skirt 4 is provided at odd points on its circumference or over its whole circumference with moulded ribs 7 which abut against the inner wall of the sleeve 1. In common with the annular lip 8 abutting against the outer wall of the round sleeve 1 it ensures a fixed positioning of the base in the sleeve 1. To ensure easy manipulation of the base 2 in the sleeve 1.

To ensure easy manipulation of the base 2 with the incandescent gas mantle situated on it on insertion into but especially on removal of it from the sleeve 1 , the base 2 has approximately a square cross-section. In another embodiment which is not shown in the drawing, the cross section is approximately circular and is provided with ribs or milled knobs on the outer side of the annular lip 8 for improved manipulation.

The sleeve 1 is closed by means of a cover 3 which is also made of plastic material which is fixedly inserted in the sleeve with a resilient lip 9, which has an conical tapering shape at the lowest point of its edge projection.

Claims (7)

Claims

1. A packing unit for packing individual incandescent gas mantles of the kind described, wherein the base of a cylindrical skirt with a closed-off base merges into a boss which is also cylindrical, and the outer diameter of which is to correspond to the female thread diameter of a mantle screwed ring and on the outer periphery of which are mounted several protuberances in such a manner that they form vestigial parts of a male thread corresponding to the female thread of the screwed ring.

2. A packing unit as claimed in claim 1, wherein that the tlat part of the skirt abutting against the boss and mounted at right angles against the latter forms a resilient abutment for the lower ring edge of the screwed ring and thus holds the protuberances in the thread pitch of the screwed ring.

3. A packing unit as claimed in claim 1 or 2, wherein protruding ribs are formed on the skirt in several places or distributed over the whole circumference these fixedly abutting against the inner wall of the sleeve to fix the gas mantle in its position relative to the sleeve.

4. A packing unit as claimed in claim 1, 2 or 3, wherein the base is approximately square to facilitate removal of the base with a mantle from the sleeve.

5. A packing unit as claimed in claim 1, 2, 3 or 4, wherein the base, the outer edge of which is provided with ribs, has a round cross-section to give a firm grip on removal from the sleeve.

6. A packing unit as claimed in any of the preceding claims, wherein the cover has an approximately conical tapering shape at the lowest point of its edge projection forming a lip which, on insertion of the cover can be pressed so far into the cylindrical sleeve that it is firmly held thereby.

7. A packing unit substantially as hereinbefore described with reference to the accompanying drawings.