SI21663A - Safety mechanism for household appliances - Google Patents

Abstract

The security mechanism for household appliances includes an electric switching assembly (1) with a PTC-resistive element (11) and a preponderating switching spring (12), where on its free end there is a shiftable contact (13), a sliding element (2) for blocking the door handle (6) and a holder (3), which is applied to the free end of the spring (12), and in the position when the handle (6) is in the locked position it reaches into the sliding element (2) opening (21). Between the free end of the spring (12) and the sliding element (2) as well as transverse to them there is a protective distance piece (4) fitting to the excursion protuberation (22) of the sliding element (2) releasing the free end of the spring (12), so that the contact (13) is removed from the home contact (14) even when the spring (12) is hot. When the handle (6) is in its locking position, the distance piece (4) fits to the non-protuberated point of the sliding element (2), so that when the appliance is switched on, the shiftable contact (13) is in contact with the home contact (14). The safety mechanism for household appliances according to the invention very simply enhances the safety of the user.

Description

Safety preparation in a white goods machine

The invention relates to a safety device in a white goods machine comprising an electrical switch assembly with a PTC resistor element and a hanging switch pen, to which a movable contact, a door locking slider and a holder mounted on the free end are attached to the free end. The retractable switch pen and the locked door handle in the state of the machine extends into the first opening of the locking slider, and more particularly, the invention relates to the refinement of this device in such a way that the electrical circuit through the machine is interrupted after the door handle has been violently opened.

The invention is classified in class D 06F 37/28 according to the International Patent Classification.

The invention solves the technical problem of how to simply refine the safety preparation of the type described in the white goods machine so that the user will be assured of safety even if the door handle is forced open during the machine operation.

The patent application SI 2000 00081 and the ensuing patent EP 1 137 030 of the applicant describe an electrical switch assembly for safety preparation in a white goods machine. The electrical switch assembly comprises a PTC resistor element, a bimetallic strip, a compensating bimetallic strip that compensates for the high temperature of the machine, and an oversized switch pen formed by a strip pen, an arc pen and a coupling pen. A PTC resistor element is inserted between the ribbon pen that defines the leak of the pen and the bimetallic ribbon in electrical contact with both. After switching on the machine switch, this is heated to 200 ° C. The free end of the pen in the over-sized switch pen changes position dramatically. At the aforementioned pro stem end, a holder is attached which, in the state of the locked door handle of the machine and the hot grip switch, extends into the first opening of the locking slider and thus prevents the door handle from opening. However, there is a risk that the locking handle of the locking slider may break and the machine door may open when the door handle is violently acted upon, even though the machine still operates.

Said technical problem is solved by a security device according to the invention in a white goods machine with the features of the first patent claim.

Preferred embodiments of the security device of the invention are, however, characterized by the features of the patent claims.

The safety device of the invention in the white goods machine in a simple way contributes to the additional safety of the user.

The invention will hereinafter be explained in detail based on the description of the embodiment and the accompanying plan showing in FIG. 1 a security device according to the invention in a white goods machine when the door handle is locked and the electrical switch of the machine is on, and FIG. according to the invention in a white goods machine in the state of a released door handle.

The safety device according to the invention in a white goods machine in the state of the locked hook 6 of its door is shown in Figure 1. It comprises an electrical switch assembly 1, a slider 2 for locking a door handle 6 of the machine and a holder 3, which in this state extends into the first opening 21 of the locking slider. 2. The door knob 6 of the machine in this state extends through the second through hole 23 of the locking slider 2 and pushes it in the direction of arrow A by compressing the spring 5. The electrical switch assembly 1 is known from the aforementioned patent SI 2000 00081 and the resulting EP patent 1 137 030. Among other things, the PTC resistor element 11 comprises, in the said files, a composite hinged switch pen 12, to which the fixed movable contact 13. The holder 3 is mounted on the open end of the switch switch 12.

According to the invention, a safety cam 4 is transversely mounted between the free end of the slider switch 12 and the block slider 2.

In Fig. 2, the security device of the invention is shown in the state-of-the-art machine in the state of the unlocked door handle 6 in the disconnected machine. In this state, the tip 41 of the locking cam 4 rests against the cam protrusion 22 of the locking slider 2. In this position, the lock cam 4 holds the free end of the oversized switch 12 so that the movable contact 13 is away from the resting contact 14 even when hot. hinged switch pen 12 otherwise retained.

In the locked door 6 state of the machine, the tip 41 of the locking cam 4 rests on a non-protruding position of the locking slider 2 so that it does not prevent the contact of the movable contact 13 with the resting contact 14.

At the point of contact with the tip 41 of the locking cam 4, the thickness of the locking slider 2 increases in the direction (arrow A) of the locking movement of the flat locking slide 2 and increases by the height of the cam protrusion 22 at a distance less than the length of this locking movement.

The locking cam 4 is pivotally mounted in the guide 42 in the direction of the deflection of the freewheel switch 12.

With the locking slider 2, when locking the door handle 6, it moves a distance s in the direction of arrow A. The spring 5 is compressed. When the user switches on the machine switch, the PTC resistor element 11 heats up and the slider switch 12 pushes the holder 3 into the first opening 21 of the locking slider 2. The door handle 6 is thereby locked. In the said movement of the locking slider 2 in the direction of arrow A, the rounded tip 41 of the guard cam 4 slid across the surface of the locking slider 2, sliding downward from the cam protruding 22 onto the non-protruding portion of its surface. The movable contact 13 could then be tampered with by the rest contact 14 and the electrical circuit of the session machine closed.

However, it is only possible to unlock the 6 door handle after the user has switched off the machine switch. The PTC resistor element 11 is cooled and the slider switch 12 moves the movable contact 13 from the rest contact 14 and pulls the holder 3 from the first opening 21 of the locking slider 2. The spring 6 then pushes the locking slider 2 in the direction of arrow B. The door handle 6 is thereby released. The rounded tip 41 of the locking cam 4 slides along the surface of the locking slide 2 and climbs to the cam protrusion 22.

In the event of a forced opening of the door, the holder 3 breaks over the block slider 2. This allows the locking slider 2 to move in the direction of arrow B, although the PTC resistor element 11 remains hot and the contacts 13 and 14 are closed. In such a case, it is the safety cam 4 that cuts the electrical circuit through the machine. Namely, its cam protrusion 22 moves the overhung switch pen 12 through the securing cam 4 so that the movable contact 13 moves away from the rest contact 14.

Claims (4)

Patent claims A security device in a white goods machine, comprising an electrical switch assembly (1) with a PTC resistor element (11) and a hanging switch pen (12) to which the fixed movable contact (13), the slide (2) for locking the hook terminate freely (6) the machine door and the holder (3) mounted on the open end of the hinged switch pen (12) and in the locked hook state (6) of the machine door extends into the first opening (21) of the locking slider (2), that between the free end of the hinged switch (12) and the blocks, a slide (2) and a transverse camshaft (4) are mounted, so that in the condition of the unlocked hook (6) of the machine door, the tip (41) of the camshaft (4) rests on the cam. (22) of the locking slider (2) and holding the free end of the possibly hot overhang switch (12) off so that the movable contact (13) is moved away from the resting contact (14) so that the tip (6) of the machine door 41) the locking camshaft (4) rests against failure locks the location of the locking slider (2) so that the movable contact (13) at the end of the hot switch switch (12) is closed with the rest contact (14). Security device in a white goods machine according to claim 1, characterized in that at the point of contact with the tip (41) of the locking cam (4), the thickness of the locking slider (2) in the direction (A) of the locking movement of the locking slider (2) increases by the height of the cam protrusion (22) at a distance less than the length (s) of this locking displacement. Security device in a white goods machine according to claim 2, characterized in that the locking cam (4) is clamped in the guide (42) in the direction of said camber or the free end of the freewheel switch (12). Security device in a white goods machine according to claim 3, characterized in that the contact point (41) of the locking cam (4) is rounded to the surface of the locking slider (2).