FR2779338A3 - Overflow protection for dishwasher - Google Patents

Abstract

Arrangement has devices for detecting the highest permitted water level in an auxiliary chamber connected to the washing tank and in a leakage water tank. The internal pressure in an enclosed air volume (2) in the auxiliary chamber depends on the water level in the auxiliary chamber. A float (9) in the leakage water tank and the pressure in the air vol. act on a microswitch (5) that closes a magnetic valve. Operation of the microswitch by both devices (2,9) for detecting the water level involves a pivotable lever (6) with a contact part (6b,12a) for engagement by transfer elements (8,10) associated with the devices.

Description

The invention relates to a double safety device against

  overflow in a dishwasher on the

  respective limit levels of an auxiliary communication chamber

  as for the washing tank and that of the leakage collecting tank which has for the detection of these levels, an enclosure

  air at a pressure depending on the water level in the chamber

  auxiliary bre, and a float in the collecting tank, acting, both, on a common microswitch to close the water supply solenoid valve, the air enclosure by means of a membrane capsule with a pusher,

  and the float by means of an actuating lever.

  PRIOR STATE OF THE ART In a dishwasher device provided with a tank for collecting water leaks, in addition to regulating the dynamic level of the tank, two levels of water are controlled, by acting on the solenoid valve d food: the level of

  overflow from the tank or from an auxiliary communi-

  as for this one, and the level of overflow of the water leakage collecting tank which is at a level lower than the

  level of the tank, to cut in both cases of overflow

  supply from this same solenoid valve.

  Document FR-2 570 462 describes a safety device against overflow at two different levels

  by means of a single actuator which is a global stop valve

  tee in series with the water supply solenoid valve. Detection of the overflow level in the work tank

  is carried out by a manometric capsule provided with mem-

  brane incorporated in the stop valve, to which

  puts through a flexible hose the pressure of an air enclosure affected by the level of the tank. Detection of the overflow level at the bottom, in the leakage collection tank

  of water, is carried out by a float with a lever, connected

  tee at the same stop valve stem as the diaphragm of the

pressure capsule.

  Document DE-195 25 895 describes a detector of

  water level operating by means of pressure from a

  closed air belt, transmitted through a

  flexible hose to a pressure capsule fitted with mem-

  brane. The membrane is integral with an axial pusher which

  passes from the capsule carcass and gives impulses to

  a lever in the shape of a stirrup to activate a micro-

electric switch.

Statement of the invention

  The object of the invention is a safety device

  rity against overflowing of water in the tank and in the leakage collecting tank in a dishwasher, characterized by

  that the actuation of the microswitch by the two de-

  tectors is effected by a common pivoting lever having

  individual contact supports for each of the actions-

  nors. The overflow safety device according to the invention offers a simple and economical structure

  for a dishwasher, using a single micro-

  switch for double actuation of the solenoid valve, and the two detectors benefiting from the same space and the same support on the two auxiliary chambers communicating with the tank, that of the float of the level regulator and that of safety against overflow, and with the the most economical usual means of transmitting the measurement

  of each level at the microswitch.

Description of the drawings

  Figure 1 is a view of an embodiment of the dis-

  positive safety against double overflow according to the

  vention, partially showing the auxiliary chamber of the

  tank and leakage collection tank.

  Detailed description of the invention

  Referring to Figure 1, the embodiment

  preferred tion of the safety device 1, comprises:

  - the air enclosure 2 on a float in the chamber 3 auxi-

  liar communicating with the tank, whose level of overflow

  dement was designated by Ni in Figure 1 - the tank 4 for collecting water leaks whose overflow level is designated by N2 in Figure 1

  - the electric micro-switch 5 which disconnects the electric

  supply S valve when activated

  - the lever 6 in the shape of a stirrup arranged on one side of the mid

  cross-switch 5 and which rotates on the vertical axis 16 for actuating the micro-switch 5 - the pressure capsule 7 inside which is incorporated a membrane (not shown) which expands following the increase air pressure in

  the enclosure 2, moving the axial pusher 8 which is solid

  Daire with it with the force F1, when the level Nl is exceeded - the float 9 in the collecting tank 4 which rises with the force F2 when the level reached approaches N2 - the lever 10 in the form of "L" of the float 9 which receives the pulses of the force F2, the latter pivoting the arm 10a of the lever around its central axis 11

  - the intermediate lever 12, integral with the access lever

  actuation 6 and transverse with respect to it, which is pushed along arrow 13 by the arm 10a of the float lever to actuate the microswitch 5 and - the support plate 14 of the manometric capsule of the actuation lever 6 and the microswitch 5 which is both the cover of the auxiliary water chambers 3 and 15

communicating with the tank.

  The actuating lever 6 can pivot on the vertical axis 16, whatever the level Nl or N2 of overflow exceeded, and independently in either case. The actuation lever 6 has a branch 6a making

  protrusion in transverse direction to activate the micro-

  switch 5 and another transverse branch 6b projecting in opposite directions to receive the thrust F1 of the

  membrane push-button 8, and pivot on the vertical axis 16.

  The intermediate lever 12 is solidly united

  at one end to the actuating lever 6, and at the other free end 12a, this end being housed at

  the free end of the arm 10a of the float lever 9,

  trant simply in contact with it if the float 9 rises to push it in direction 13, when the level N2 is exceeded in the collecting tank 4, causing the

  actuating lever 6 of microswitch 5.

  When the level Ni of overflow of the tank is exceeded, the actuation lever 6 receives by means of

  diary of its branch 6b the thrust F1 of the membrane via the pusher 8, and pivots on the axis 16 verti-5 cal to actuate the microswitch 5. The lever 12 is then moved freely by the lever actuation 6 in se

separating from lever 10 of the float.

Claims (2)

R E V E N D I C A T I ON S   1) Double safety device against overflow in   a dishwasher on the limits (Nl, N2) limits respec-   tifs of an auxiliary chamber (3) communicating with the washing tank and that of the leak collecting tank (4) which has, for the detection of these levels (N1, N2), an enclosure (2)   air at a pressure depending on the water level in the chamber   bre (3) auxiliary, and a float (9) in the collecting tank (4), acting, both, on a common microswitch (5) to close the water supply solenoid valve, the enclosure ( 2) air by means of a membrane capsule (7)   with a pusher (8), and the float (9) by means of a   actuating plate (10), characterized in that   actuation of the microswitch (7) by the two detectors   teurs (2, 9) is effected by a common pivoting lever (6)   having individual contact supports (6b, 12a) for each none of the actuators (8,10).   2) The overflow safety device according to claim 1, wherein   the common actuation lever (6), for actuating the mid   hook switch (5) pivots about a vertical axis (16) supported by the cover (14) of the auxiliary chamber (3), and said contact supports (6b, 12a) are located on two projecting members (6b , 12) located on the same side at different height, and the actuation lever (10) of the float has   the shape of an "L" and pivots around a central axis (11).