DE2127192A1 - Safety device for washing machines - Google Patents

Description

Dipl. Ing. C. Wallach

Dipt. Ing.G. Koch -) ₍ Juhi fS? 1

Dr. T. Haibach

S chicken 2

Kauiingerstr. 8, Tel. 240276

Industry A. Zanussi S.p.A. in Pordenone, Italy.

Safety device for washing machines.

The invention relates to a safety device for washing and centrifuging machines for locking their door, so that the opening of the same is delayed in a predetermined manner and consequently the access to the interior of the machine can not take place before the speed of the spinner is reduced to values that with the normal security requirements are compatible.

There are already pneumatic devices for delay of the opening of the door of washing machines known, from the KühlflUgel dee actuation motor of the washing and spinning basket being controlled. With other solutions, the

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Delay devices due to the water level in the washing tank, possibly controlled in conjunction with the operation of the drain pump. Electromechanical delay devices are also used known, but they require complicated mechanisms and linkages.

It must be taken into account that, according to the standard, a double fuse is prescribed, the first being the hot water level in the washing container and the second relates to the speed of the washing and spinning basket.

According to the invention there is now an improved locking device Proposed for the door of washing machines and spin dryers, which comprises a locking member, which from the outside can be actuated and can assume two positions, it being in a first position on the part of a part fixed to the machine and is held in the second position by a bolt, which, as a result of the displacement of the locking member of the first can be released into the second position with delayed movement is, and wherein the locking member in its second position one in the electrical supply circuit of the motor the switch that is switched on opens.

In a preferred embodiment of the device according to the invention the retarding effect is exerted by a group of suction cups that are generated by one when closing certain degree of negative pressure are kept in contact with each other, which contact when unlocking the door by the combined Effect of a return spring and the natural elasticity of the suction cups is gradually released.

The main advantage of the locking device according to the invention is that it is extremely simple in structure and

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nevertheless has a practically experimented operational reliability. Another advantage is that it is delayed Unlocking and opening of this door can be adjusted to match the operating code of the machine and that at the same time excessive delays are avoided will.

An exemplary embodiment of the safety lock according to the invention Lungs before direction is explained in more detail below with reference to the drawing.

Fig.1 shows the device in side view, partly in Cut and

Fig.2 is a view similar to Fig.l, the locking device is shown during opening.

In the drawing, part of the AußengehSuses 10 of a washing machine is shown, which has an opening 11, by the end of a hook 12 for locking the TtIr, not shown, of the washing machine in the closed position is passed through, wherein the hook 12 can be actuated from the outside and from a locking position to a delayed one Unlocking position can be transferred, which are shown in Fig.l with fully marked or dashed lines.

On the inside of the machine housing 10, a plate 13 is slidably attached in a suitable manner, which has an opening 14, which is the same size as the opening 11 and can cover the same. An arm 15 protrudes from the plate 13 on which a pair of suction cups 16, preferably made of rubber is attached, with the concave side of this suction cup facing

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below points. A tension spring 17, the lower end of which is fastened to the arm 15 and the upper end of which is fastened to a hook 18 fixed to the housing is, seeks to pull the plate 13 upwards (in Fig.l).

An L-shaped bag 19 is attached to the inside of the housing, the protruding arm vertically below the arm 15 of the Plate 13 lies and runs parallel to this. At this A tube 20 is attached to the arm of the bracket 19, which at its upper end has a conical nozzle 21 around which a pair of suction cups 22 made of rubber is attached, the concave side of these suction cups facing upwards and dimensioned in this way is that this suction cup 22 along its edges with the Suction cups 16 can come into contact.

A cylindrical valve 23, which is attached to a rod 24, is displaceable within the conical nozzle 21, which in turn is attached to a threaded plug 25 which can be screwed in and out of the tube 20. A threaded pin on the side 26 is used to the threaded plug 25 in the regulated Location. By moving the threaded plug axially the passage opening between the valve 23 and the * inner wall of the nozzle 21 is set, whereby the freedom of connection and the passage of air between the cavity 27 formed by the two pairs of suction cups 16 and 22 (when the suction cups are in contact with each other along their edges) and the Outside atmosphere can be regulated through a hole 28 in the pipe wall 20 st.

Finally, a microscope holder 29 is located above the hook 18 arranged, the operating lever 30 occupy two positions

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can (those in Fig. 1 with fully extended or dashed lines Lines are indicated), with the power supply in the position of the lever 30 drawn with full lines to the drive motor of the wash and spin basket is permitted, while in the one shown with dashed lines Position of the lever 30, the motor is de-energized. One not The spring shown seeks to hold the lever 30 in the position shown with dashed lines.

The operation of the device described is as follows. When the door of the washing machine is closed, the hook 12 penetrates through the openings 11 and 14 and takes the full one Lines shown position, where he lever 30 of the microswitch 29 transferred to that position in which the power supply to the drive motor is permitted, while at the same time the arm 15 of the plate 13 is pressed downwards, overcoming the action of the spring 17, so that the pair of suction cups 16 is lowered and comes with its edges with those of the suction cups 22 in contact. The air contained in the cavity 27 is thereby compressed so that the air exits through the bore 28. The Hook 12 locks with its step 31 against the edge the opening 11 of the machine housing 10. Normally is the hook 12 by appropriate means, not shown, such as a return spring, in this locking position held, with appropriate means for performing the vertical and axial displacement provided for its actuation are.

If you now want to unlock the door of the washing machine, then the hook 12 is pulled up to that he is under the action of

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mentioned retraction means with its step 33 with the upper one Edge 34 of the opening I4 of the plate I3 comes into engagement (dashed line ^ drawn position in Fig.l), in which position the opening of the door and thus the exit of the hook 12 are still prevented by the opening 11 of the machine housing.

As a result of this displacement of the hook 12, the lever 30 of the microswitch 29 assume the position in which the power supply to the drive motor of the spin basket is interrupted is so that the same continues to rotate while reducing its speed due to its inertia. Furthermore, the Arm 15 of plate I3 is no longer depressed by hook 12 and the spring I7 can fully exert its release action and seeks to remove the pair of suction cups l6 from the pair of suction cups 22 to separate.

Due to the elasticity of the material forming the two pairs of suction cups, the suction cups are drawn in length, so that the volume of the cavity 27 increases and outside air through the hole 28 and through the throttled passage between ^ see the valve 23 and the conical nozzle 21 is sucked in. At a certain moment, the action of the spring 17 overcomes the tendency for the pairs of suction cups to come into contact with one another stay and the upper pair of suction cups move away together with arm 15 from the lower. The plate I3 is moved with it and the step 33 of the hook 12 is released, which then on the part of the lower edge of the opening £ 4 of the plate 13 is pushed through the opening 11 to the outside (as can be seen in Fig. 2).

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It is noteworthy that the delay in the release of the hook 12 from that shown in Figure 1 with dashed lines Location depends on the speed with which the pair of suction cups 16 is separated from the stationary pair of suction cups 22, this speed in turn depends on the amount of air entering the cavity 27 in the unit of time. The delay can thus be regulated that by acting on the threaded plug 25 expediently the Passage width between the conical nozzle 21 and the cylindrical valve 23 is changed. With appropriate calibration the device can thus obviously, within certain limits, apply the same to any desired delay adapted: it can be achieved that the set delay is certainly greater than the time that the laundry basket the washing machine needed to get off the spin speed (usually on the order of 700 RPM) to the Wash speed (usually around 60 rpm) or lower.

It should also be emphasized that through the application of a cylindrical valve element 23 is allowed to compensate for any errors or machining defects of the nozzle and a to carry out a calibration proportional to the spin speed.

The invention has been explained based on an embodiment ei ^1, however, it being understood that are possible within its scope many variations. In particular, the delay device can experience changes by which the house is temporarily locked.

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Claims (8)

Claims (1J security locking device of the door of a Washing and spinning machine, characterized in that a locking member (12) which can be actuated from the outside is provided is, which can assume two positions, wherein it is in one position on the part of a machine-fixed part (32) and is held in the second position by a bolt (13), which in turn, according to the displacement of the The locking member can be released from the first to the second position with a delayed movement, the locking member in the second position a switched on in the electrical supply circuit of the drive motor of the machine Switch (29) opens. 2. Apparatus according to claim 1, characterized in that the locking member is a hook (12) which is suitable is through an opening (11) in the machine housing (10) to penetrate and on the part of the lower edge (32) of this opening, which engages with a step (3I) of the hook (12) comes to be held in the first position. 3. Apparatus according to claim 2, characterized in that the hook (12) has a second step (33) which in the second position of the hook with the upper edge (34) of an opening (I4) of the releasable with delayed movement Latch (I3) comes into engagement. -8th- 109850/1713 4. Apparatus according to claim 3, characterized in that the bolt consists of a plate (13) which is between is displaceable in two layers, the hook (12) being held in its second position in the first position of the plate is, while in the second layer of the plate its breakthrough (14) with the opening (ll) of the machine housing covers, and wherein the transition of the plate from the first to the second layer is controlled by delay means. 5. Apparatus according to claim 4> characterized in that that the delay means consist of at least one pair of suction cups (l6,22), which suction cups along their edges with each other are brought into contact, one of them being connected to the movable plate (I3), during the other fixed and provided with an axial passage (21) through which the cavity (27) between the in contact with each other suction cups (l6,22) with communicates externally, the plate (I3) under the action a spring (17) which seeks to transfer it to the second position and wherein the pair of suction cups (16, 22) in the first layer of the plate (I3) is in contact with one another. 6. Device according to claim 5, characterized in that the plate (13) on the part of the hook (12) in its first position is moved when the hook assumes its locking position. 7. Apparatus according to claim 5 »characterized in that in the axial passage (21) for the purpose of adjustable throttling the same a valve (23) is arranged. -9- 109850/1713 8. Apparatus according to claim 1, characterized in that
that the switch (29) is held by a spring in the position in which the power supply to the drive motor,
is interrupted, while it is held closed by the locking member (12) in its first position for the purpose of feeding the drive motor. -10- 109850/1713