JPH0117227Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a shoulder mounting structure for a metal thermos flask.

(Prior Art) Conventionally, as a means for integrating a metal vacuum double bottle and a synthetic resin shoulder covering the mouth thereof, a male thread is formed on the outer periphery of the neck of the vacuum double bottle, A female thread is formed on the inner periphery of the shoulder body and the two are screwed together, but if left as is, it would loosen and rattle during use, making it difficult to put it to practical use. The two are fixed together using a stopper.

However, with a structure in which the shoulder body is fixed with adhesive after being screwed on, it takes more than half a day for the adhesive to dry and remove its odor, and the adhesive deteriorates over time. Moreover, since the weight of the contents is applied, there is a problem that the adhesive part easily comes off, resulting in a lack of reliability. Further, in a structure in which screws are secured after screwing, a plurality of screws are required, and therefore assembly is complicated and requires a large number of man-hours.

Therefore, as shown in Japanese Utility Model Application Publication No. 59-188031, the applicant fixed a locking metal fitting with a protruding locking claw to the shoulder of a double vacuum bottle by welding, while at the same time A serrated locking groove is provided on the shoulder body so that when the shoulder body is screwed onto the neck of the vacuum double bottle, the locking pawl of the locking metal fitting will be locked in the locking groove of the shoulder body. proposed a device that prevents the shoulders from rotating in the opposite direction.

(Problems to be solved by the invention) However, in the above proposal, although the shoulder body is completely prevented from loosening, since the locking metal fittings are welded to the vacuum double bottle, welding is labor-intensive, and welding defects may occur. This causes problems such as cracks in the vacuum double bottle and vacuum failure.

The present invention was created in view of such problems, and it is possible to integrate the vacuum double bottle and the shoulder body by simply screwing them together without using adhesives, screws, or welding. An object of the present invention is to provide a shoulder body mounting structure for a metal thermos flask that can prevent loosening when the thermos is closed.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides a metal vacuum double-bottomed bottle consisting of an inner bottle and an outer bottle joined at the mouth, and having a male threaded neck. and a locking metal fitting attached to the lower neck of the vacuum double bottle and having at least two locking claws protruding from the circumference, and a female threaded part screwed into the male threaded part of the vacuum double bottle. a shoulder body made of synthetic resin that covers the mouth of the vacuum double-bottomed bottle, and a shoulder body made of synthetic resin that covers the mouth of the vacuum double-bottomed bottle, which is provided with a serrated locking groove around the lower part of the female threaded portion in which the locking claw of the locking metal fitting is locked; In the shoulder mounting structure for a metal thermos flask, a protrusion is formed in the vertical direction below the neck of the vacuum double bottle, and the locking metal fitting is formed in an annular shape, and the vacuum double It is constructed with a notch that engages with the protrusion of the bottle.

(Example) Next, an example of the present invention will be described with reference to the accompanying drawings.

In Figure 1, 1 is a metal vacuum double bottle,
It consists of an outer bottle 2 and an inner bottle 3, and the outer bottle 2 and the inner bottle 3 are joined at a mouth part 4, and a space 5 between them is a vacuum. A male thread 8 is formed on the outer periphery of the neck 6 of the outer bottle 2 of the vacuum double bottle 1 to screw onto a shoulder body 7 made of synthetic resin that covers the mouth 4 of the vacuum double bottle 1. A semi-cylindrical protrusion 10 with which a locking fitting 9 to be described later engages bulges out at two locations,
Further, below the protrusion 10, a first shoulder 11 with which the locking fitting 9 comes into contact and a second shoulder 12 with which the shoulder body 7 comes into close contact are formed. Furthermore, a stepped portion 13 is formed inside the mouth portion 4 of the inner bottle 3 to which the shoulder body 7 is pressed.

As shown in FIG. 2, the shoulder body 7 has a cylindrical outer wall part 14 and a cylindrical inner wall part 15 formed integrally with the end surface of the outer wall part 14 inside the outer wall part 14, and there is a space between them. The mouth portion 4 and neck portion 6 of the vacuum double bottle 1 are fitted into the bottle. A female thread 16 is formed on the inner circumferential surface of the outer wall portion 14 and is threaded into the male thread 8 of the neck portion 6 of the vacuum double bottle 1.
A sawtooth locking groove 18 is formed on the entire circumference of the lower surface of the stepped portion 17, and the second stepped portion 19 at the lowest level is in close contact with the second shoulder portion 12 of the vacuum double bottle 1. Further, the outer wall portion 14 has a stepped outer peripheral surface, and a male screw 20 for screwing a lid (not shown) is formed on the outer peripheral surface of the middle step, and an ear portion 21 for attaching a handle is formed on the outer peripheral surface of the lower step. It is integrally protruded. On the other hand, the lower end of the inner wall portion 15 is pressed into contact with the stepped portion 13 of the inner bottle 3 of the vacuum double bottle 1 via a cap rubber 22, and the inner peripheral surface thereof has a female thread 2 which is screwed into a stopper (not shown).
3 is formed.

As shown in FIG. 3, the locking fitting 9 is formed in an annular shape with a square cross section, and the vacuum double bottle 1 is provided at two opposing locations on the inner periphery of the upper end edge 24.
A semicircular notch 25 that engages with the protrusion 10 is provided. In addition, the lower end flange 2 of this locking metal fitting 9
6, two elastic locking pawls 27 are provided at substantially point-symmetrical positions in a tangential direction on the same circumference as the pitch circle of the locking groove 18 of the shoulder body 7, and in a tangential direction for tightening the shoulder body 7. It is cut and raised to obtain an inclined surface that rises in the direction of rotation. The spacing between the tips of these locking pawls 27 is determined by the locking groove 18 of the shoulder body 7 in order to prevent play from occurring when the shoulder body 7 is screwed.
It is slightly different from the value obtained by multiplying the pitch interval by an integer.

To attach the shoulder body 7 to the mouth 4 of the vacuum double bottle 1, first fit the locking fitting 9 into the neck 6 of the vacuum double bottle 1, and insert the notch 25 into the vacuum double bottle 1. 1, and its lower end flange 26 is brought into contact with the first shoulder 11 of the vacuum double bottle 1. After placing the cap rubber 22 on the step 13 of the vacuum double bottle 1, the shoulder body 7 is placed over the mouth 4 of the vacuum double bottle 1 and screwed together, until the shoulder body 7 stops rotating. Tighten until

When the shoulder body 7 is screwed onto the neck 6 of the vacuum double bottle 1, the locking groove 18 of the shoulder body 7 and the locking pawl 27 of the locking fitting 9 engage with each other, as shown in FIG. However, since the tip of the locking pawl 27 does not lock in the locking groove 18 in the tightening direction shown by the arrow A in the figure, the second step 19 of the shoulder body 7 is attached to the second shoulder 12 of the outer bottle 2. Rotate until they are close together. Further, in the unscrewing direction opposite to the arrow A in FIG. 10 is engaged and prevented from rotating, the shoulder body 7 does not rotate even if a force is applied in the opposite direction. Also,
Since the locking metal fitting 9 is brought into contact with the first shoulder portion 11 of the vacuum double bottle 1 by the elastic force of the locking pawl 27, it will not wobble up and down.

If the spacing between the tips of the locking pawls 27 is an integral multiple of the pitch spacing of the locking grooves 18 of the shoulder body 7, play will occur by the pitch spacing, for example, 3 mm. Since the locking pawl 27 locks into the locking groove 18, backlash is significantly reduced. for example,
As shown in FIG. 3, when the locking metal fitting 9 has two locking claws 27, the pitch interval of the locking groove 18 can be reduced to at most half, or 1.5 mm in the above example.

(Effects of the invention) As is clear from the above explanation, according to the invention, the shoulder body and the neck of the vacuum double bottle can be easily integrated and fixed by simply screwing them together, and The return of the shoulder body is completely prevented.

In addition, it is not necessary to fix the shoulder body and the vacuum double bottle with adhesive or screws after screwing as in the conventional case, and the locking fitting engages the notch with the protrusion of the vacuum double bottle. This is intended to prevent rotation, and is not fixed to the vacuum double bottle by welding, which not only significantly reduces the number of man-hours required to attach the shoulder body of a metal thermos flask, but also prevents cracks due to poor welding. It has the effect of not having any effect.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view of a metal thermos flask to which the shoulder mounting structure of the present invention is applied, Fig. 2 is a partial sectional view of the shoulder body, and Fig. 3 is a plan view of the locking fitting for fixing the shoulder body. FIG. 4 is a partial side view of the locking metal fitting for fixing the shoulder body. 1... Vacuum double bottle, 4... Mouth, 6... Neck,
7... Shoulder body, 8... Male thread, 9... Locking metal fitting, 1
0... Protrusion, 16... Female thread, 18... Locking groove,
25... Notch, 27... Locking claw.

Claims (1)

[Scope of utility model registration request] A metal vacuum double bottle consisting of an inner bottle and an outer bottle joined at the mouth and having a male threaded part formed in the neck; It has a locking metal fitting with a protruding locking claw, and a female threaded part that is screwed into the male threaded part of the vacuum double bottle, and has a serrated shape in which the locking claw of the locking metal fitting is locked below the female threaded part. A shoulder body mounting structure for a metal thermos flask, comprising: a shoulder body made of synthetic resin that covers the mouth of the vacuum double bottle and having a locking groove surrounding the bottle; While forming vertically,
A shoulder body mounting structure for a metal thermos flask, characterized in that the locking metal fitting is formed into an annular shape, and a notch portion is provided on the inner periphery of the locking metal fitting to engage with a protrusion of the double vacuum bottle.