US2250357A - Electric range - Google Patents

Description

July 22, 1941. E. CHALLET ELECTRIC RANGE Filed Jan. 3, 1939 2 Sheets-Sheet 1 1941- E. CHALLET ELECTRIC RANGE Filed Jan. 3, 1939 July 22 2 Sheets-Sheet 2 Patented July 22, 1941 ELECTRIC RANGE Etienne Challet, Paris, France, assignor of one- !ourth to Entreprises Electriques Fribourgeoises,

Frlbourg, France Application January 3, 1939, Serial No. 249,132 In France November 24, 1938 4 Claims.

It is known to use plates made of a plurality of parts which are adapted to be depressed more or less when a receptacle having a more or less deformed bottom is placed on them. Plates of this type are described in Swiss Patent No. 193,- 023 and Swiss patent of addition No. 199,640.

The present invention has for its object a device which permits of the simple arrangement of the spring system that serves for retracting the movable plate element or elements of this kind, for the purpose of shielding said spring system from the action of the heat evolved by the plate and consequently of enabling it to retain its resilient properties, while ensuring a perfoot operation.

The device according to the invention is characterized by the fact that the spring system is lodged below the plate proper and in the space normally reserved for an earthenware part or parts from which the connecting prongs emerge.

According to the type of plate used, one or a plurality of springs may be employed, and at the same time connecting rods, equalizing bars, bearing members are provided for the various movable elements, so as to connect same to the spring which constantly tends to bring said elements back to their upper position.

By way of example, variousembodiments of plates equipped with springs according to the invention have been shown in the accompanying drawings.

In said drawings:

Fig. 1 shows a section of a plate, the central part or head of which is movable, with a fixed annular part and a single central spring inside the insulating parts of the plugs.

V Fig. 2 shows a partial plan view of the detail a of an arm of the shell.

Fig. 3 is a section along III-III of Fig. 1.

Fig. 4 shows the section of a similar plate to that of Fig. 1, but with a spring of larger diameter located outside the insulating parts of the plugs.

Fig. 5 is a section of a plate having a movable central head, a movable intermediate annular tops of which will advantageously be shaped like Said annular shell is closed at the bottom by a disc 8 which is fixed at 9 under the three arms, one of which is shown at I, and at H), against'the" shell.

Under the lower part of the disc 8 is fixed a squirrel cage, the holes of which are visible at l2 in Fig. 13 and which is closed by a continuous.

bottom l3. On the bottom of said squirrel cage is fixed the earth plug. Theconnecting plugs such as l5 are arranged in separate insulating parts l6 which are held between the bottom 8 i and the plate l3 of the squirrel cage.

The spring I1 is located at the centre of the space between the'insulating parts IE: it is surmounted by a cap i8 having a hollow l9, so as to receive a push rod 20, the other end of which bears at 2| under the head-2r It will be understood that when a receptacle filled with liquid or other substance is placed on the head, the same tends to be depressed and compresses the spring I! through the intermediary'of the rod 20. The lower part 22 of the head 2 limits the downward travel of said head, since it abuts against the flange 6. On the contrary, when the head moves upwards again, the travel of same is limited by means of tongues such as 23 which are bent and abut under the flange 6 of the shell.

The shell 5 is provided with a hole 24- Fig. 2)

in order to enable a tube 25, which supports the ring, to be fixed therein.

In Fig. 4 there is the same device. formed by the outer ring I and the movable head 2; all the other parts are identical, including the squirrel cage II, but the spring 26- is outside the insulating parts It. It is therefore of larger diameter and is better ventilated. A plurality of push rods, preferably three, are interposed between the spring and the head. One of said rods is shown at 21.

Both in Fig. 1 and in Fig. 4 it will therefore be seen that the springs are open to the atmosphere and are as remote as possible from the heating parts. Owing to the holes II 01' the squirrel cage, they can disperse the small amount of heat they may still collect.

Fig. 5 shows a plate comprising a movable head 28, a movable intermediate ring 20, and a fixed outer ring 30. Abutment tongues 33 have also been provided.

The arms such as 34 are in this case provided with two holes 35 and 30; the hole 3! receives a fixed tube 31 which supports the outer ring 84, the hole 36 receives a sheath 3 in which is adapted to slide a piston 39 which is fixed under the movable ring 29. An equalizer bar 40 is pivoted at one of its ends, on the lower part of the piston 39, and bears at its other end under the head 2! through the intermediary of a push rod 42 which is held in recesses 4| and 43. There are preferably three equalizer equipments at 120 to each other, controlled by the same push rod 42.

Each equalizer rests on a rod 44 which is opposite the convolutions oi. the spring, which it receives /;;,oi the thrust; the lever arms of an equalizer are calculated according to the respective weights of the head 28 and of the movable ring 28. Advantageously also the head and the annular elements are provided with annular crests, as shown in dotted lines.

Fig. '7 is similar to Fig. 5, but the central head is replaced by a heating torus 4B, the movable annular element is replaced by the movable torus 41, the fixed outer element is replaced by the torus 48; there are again the same equalizer systems 40 with a rod 55 passing through a sheath 49, each equalizer supporting at the other end a rod 50 which abuts at the upper part in the hollow of a plate 52 having an edge 53, so as to support the torus 48.

Tongues 54 serve as abutments, for the upward travel, against the flange 52, whereas in the downward movement, the travel of the torus 4B is limited by the edge 53 under the flange 32. The arrangement of the spring 45 in the squirrel cage i I is also seen, as it is moreover in Fig. 5.

The cross-section of the toms is not necessarily round, it may be flattened at the top, be of elliptical shape or bean-shaped, etc.; instead of one torus, there may be two or three toruses which more or less touch each other, as indicated in the aforesaid Swiss patent and patent of addition.

The spring mounting device for an electric heating plate having at least one movable element can be adapted to any other kind of electric heating plates which are not shown in the drawings which have only been given by way of example, and in particular to plates in which all the elements are movable.

Said device can also be advantageously adapted to plates having connecting plugs or pins arranged elsewhere than at the centre and underneath; in this case said device remains located in the central part and underneath.

I claim:

1. In an electric range, a hot plate comprising a central movable mushroom-shaped heating element, a movable intermediate heating ring, a fixed outer heating ring, a central push rod bearing at one end against said central heating element in order to support the same, push rods located below said movable ring for supporting the same, diametrically opposed equalizer bars cooperating with said central push rod and said push rods cooperating with said movable ring, a spring located below said hot plate and push rods reacting with said equalizers and said spring so as to support said central heating element and said movable ring.

2. In an electric range, a hot plate comprising a central movable mushroom-shaped heating element, a movable intermediate heating ring and a fixed outer heating ring, a central push rod located below said central heating element for supporting said element at its center, three push rods cooperating with said movable ring and spaced from one another, equalizer bars cooperating with said central push rod and said three push rods, a spring located below said hot plate, connecting rods cooperating with the upper convolution of said spring and said equalizers so as to support said central heating element and said intermediate movable ring.

3. In an electric range, a hot plate comprising a central movable mushroom-shaped heating element, a movable intermediate heating ring and a fixed outer heating ring, a central push rod located below said central heating element to support the same, a plurality oi push rods cooperating with said intermediate heating ring, a plurality of equalizers extending between said central push rod and said plurality of push rods cooperating with said intermediate heating ring, a helical spring located below said hot plate and a connecting rod for each equalizer cooperating with the upper convolution of said spring and said equalizers so as to support said central heating element and said intermediate heating ring.

4. In an electric range, a hot plate comprising a central movable heating toms, a movable medial torus and a fixed outer heating torus, a

central plate supporting said central torus, a: push rod cooperating with said central plate,'a

push rod cooperating with said medial torus, an equalizer cooperating with said central push rod and said push rod cooperating with said medial torus, a spring located below said hot plate and a connecting rod cooperating with said spring and said equalizer.

ETIENNE CHALLET.

Images