CA1136512A

CA1136512A - Bed warmer

Info

Publication number: CA1136512A
Application number: CA000348008A
Authority: CA
Inventors: Berthold Kalbas
Original assignee: Individual
Current assignee: Individual
Priority date: 1979-03-24
Filing date: 1980-03-19
Publication date: 1982-11-30
Also published as: DE2911626A1

Abstract

Abstract A hot water bottle of synthetic plastic material has a neck in which a tubular sleeve with an internal thread is embedded. The outwardly directed end of the sleeve is covered by a layer of the plastic material. A screw plug for closing the sleeve has a flange provided with an annular surface which presses against this layer when the plug is threaded into the sleeve.

Description

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BackgTound of the Inventi~on The present inYentIon relates to a bed warmer. ~lore particularly, the invention relates to a warming bottle adapted to contain warm or hot water so that, when the bottle IS placed e.g. between the sheets of a bed, it will warm the sheets.
In particular, the invention relates to a hot-water bottle of the type mentioned above, which is of synthetic plastic material.
A hot water bottle of this general type is known, having a neck through which water is filled and emptied. Embedded in the neck of this bot-tle is a sleeve provided with a retainer for a closure plug which is used toclose the bottle when water is present in it. This sleeve is so embedded that the closure plug is seated directly on the upper end of the sleeve. The sleeve, however, quite frequently does not tightly bond with the surrounding plastic material, even if special bonding agents are used. Therefore it is possible for water vapor to escape between the outer surface of the sleeve and the surrounding synthetic plastic material of the bottle neck. This is a disadvantage, since it tends to moisten the sheets and may, if the water is very hot and the bottle is left in place while the bed is occupied, even con-stitute a hazard to the user.
Summary of the Invention It is an object of the invention to avoid the prior-art disadvant-ages.
A more particular object is to provide an improved hot water bottle of the type in question, which is not possessed of the aforementioned dis-advantages.
Yet a more specific object of the invention is to provide a hot water bottle which avoids all possibility of leaks but in which the neck sleeve can nevertheless be embedded in the synthetic plastic material without 1~36512 any problems.
In pursuance of these objects and of still others which will become apparent hereafter, the invention provides a hot water bottle comprising a body including a neck, at least said neck being of synthetic plastic material;
a tubular sleeve of glass-fiber reinforced polyamide embedded in said neck and having a free end facing outwardly of the same, said free end being covered by a layer of the material of said neck, said sleeve being of a circular cross-section and including a first collar provided at an exterior of said sleeve and being adjacent said free end and a second collar located substantially midway between said free end and another end of said sleeve, said first and said second collars each including an annulus of through holes filled with the material of said neck; a closure plug for closing the interior of said sleeve; and cooperating means including interior and exterior screw threads on said sleeve and said plug, respectively for sealingly but releas-ably connecting said plug to said sleeve so that the plug presses against said layer.
It has been found especially advantageous if the two collars have identical numbers of through holes or bores and if these are of identical diameter. Particularly good results have been obtained if the outer diameter of the collar at the sleeve end is about 33 mm and the outer diameter of the other collar is about 35 mm. The inner sleeve diameter is about 24 mm. The collars preferably have an annulus of 24 holes each with a diameter of 2.5 mm.
The thickness of the synthetic plastic bottle material covering the sleeve end adjacent the plug need not be greater than about 1 mm; a flange of

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the plug is manually screw-threaded against this coyering by means of a handle.
The plug itself is preferably of polypropylene and the annular shoulder of its flange can become directly seated on the exposed surface of the coYering which overlies the adjacent end of the sleeve.
A particularly simple manner of making the bottle is possible by placing the sleeve in requisite position into an iniection mold having a cavity shaped to form the desired bottle, removing the mandrel upon completed injection from the mold via an open slot, and thereafter closing this slot in the bottle by high-frequency (heat) welding of the bottle material.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, to-gether with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawing.
Brief Description of the Drawings Figure 1 is a fragmentary section, showing the neck of a bottle ac-cording to the invention with the closure plug in place; and Figure 2 is an end view of the sleeve embedded in the material of the bottle neck.
Description of the Preferred Embodiment The hot water bottle shown in Figures 1 and 2 is of a soft, elasti-cally yieldable rubber-like synthetic plastic material, preferably a thermo-plastic material. Its body (not shown because the shape and construction are not essential for an understanding of the invention) has a neck 1 in which a sleeve 2 of glass-fiber reinforced polyamide is embedded. The sleeve 2 is of essentially circular cross-section and has an internal screwthread 3 and two outer collars 4, 5. The collar 4 is provided adjacent that end into which a -"` 1136~51Z

closure plug 6 is sealingly insertahle; the collar 5 is located ahout midway between the ends of the sleeve 2. Each collar 4, 5 has an annulus of circum-ferentially distributed through.going bores or holes 7; the number of holes in each annulus is the same and the diameters 8 of the holes are also identical.
If, for example, the inner diameter 9 of sleeve 2 is about 24 mm, then the outer diameter 10 of collar 4 should be about 33 mm and the outer diameter 11 of collar 5 about 35 mm. Each annulus may have 24 holes 7, each having a dia-meter 8 of about 2.5 mm.
The sleeve 2 is embedded in the neck 1 by injection molding, in such a manner that collar 4 is adjacent the plug 6 and the exterior of collar 4 is covered by the bottle material, which forms on it a covering 13 have a thick-ness 12 of about 1 mm. Covering 13 extends to the internal thread 3 of the sleeve 2. The external thread 14 of the plug 6 is threaded into the internal thread 3 until an annular surface 16 of a flange 15 on plug 6 firmly presses against the covering 13. To facilitate this tightening of the plug, the latter is provided with a handle 17.
To facilitate rapid and strong tightening of the plug and to estab-lish a good seal, the threads 3 and 14 are configurated as trapezoidal threads.
A separate, not illustrated sealing ring may be placed between covering 13 and annular surface 16 to enhance the sealing effect. If so, it is advantageous for this separate ring to be of an elastomeric material and have a thickness of at least 2 mm. The inner diameter of such a ring should be smaller than the outer diameter of the thread 14 so that, when the ring is slipped over the thread under simultaneous elastic extension, it will be reliably retained on the plug even when the same is detached from the neck 1.
To make the bottle according to the invention the sleeve 2 is placed in requisite position in the cavity of an injection mold. After injection and coding of the injected material the mandrel is extracted from the newly-produced bottle throu~h a slot which has been left open in the same for thispurpose. This s-lot IS then closed by high-frequency welding. The material used for the bottle can be colored in any desi-red manner and, if desired, can also have a scenting agent mixed with it to appeal to the user ~e.g. pine scent, flower scent, or the like).
While the invention has been illustrated and described as embodied in a hot water bottle, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without depart-ing in any way from the spirit of the present invention.
Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.
What is claimed as new and desired to be protected by Letters Patent is set forth in the appended claims.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. A hot water bottle comprising a body including a neck, at least said neck being of synthetic plastic material; a tubular sleeve of glass-fiber reinforced polyamide embedded in said neck and having a free end facing outwardly of the same, said free end being covered by a layer of the material of said neck, said sleeve being of a circular cross-section and including a first collar provided at an exterior of said sleeve and being adjacent said free end and a second collar located substantially midway between said free end and another end of said sleeve, said first and said second collars each including an annulus of through holes filled with the material of said neck;
a closure plug for closing the interior of said sleeve; and cooperating means including interior and exterior screw threads on said sleeve and said plug, respectively for sealingly but releasably connecting said plug to said sleeve so that the plug presses against said layer.

2. A hot water bottle of claim 1, wherein said first collar has an outer diameter which is smaller than the outer diameter of said second collar and substantially equal to the median diameter of said annulus of holes of said second collar.

3. A hot water bottle as defined in claim 1, wherein said material is a thermoplastic material.

4. A hot water bottle as defined in claim 2, each of said annuli having a number of holes equal to the number of holes in the other annulus, and all of said holes having identical diameters.

5. A hot water bottle as defined in claim 2, said first collar having an outer diameter of about 33 mm, said second collar having an outer diameter of about 35 mm, said sleeve having an inner diameter of about 24 mm and said holes having a diameter of 2.5 mm.

6. A hot water bottle as defined in claim 1, said layer having a thick-ness of about 1 mm.

7. A hot water bottle as defined in claim 1, said plug having a plug body, a handle at one end of said plug body, and a flange between said plug body and handle and provided with an annular surface adapted to move into direct pressure-exerting contact with said layer.

8. A hot water bottle as defined in claim 1, said body being a scented material.

9. A hot water bottle as defined in claim 1, and further comprising a sealing ring interposed between said plug and said layer.

10. A hot water bottle as defined in claim 9, said sealing ring being of elastomeric material and having a thickness of at least 2 mm and a pre-determined inner diameter.

11. A hot water bottle as defined in claim 1, wherein said interior and exterior threads are trapezoidal threads.

12. A hot water bottle as defined in claim 1, said plug being of poly-propylene.

13. A hot water bottle as defined in claim 1, said body and neck being of injection-molded synthetic plastic material in which said sleeve is embedded, said body having on completion of injection-molding a slot through which the molding core is extractible and which is subsequently `. 7 sealed by high-frequency welding.