US3776216A - Self-cleaning oven - Google Patents

Self-cleaning oven Download PDF

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Publication number
US3776216A
US3776216A US00304951A US3776216DA US3776216A US 3776216 A US3776216 A US 3776216A US 00304951 A US00304951 A US 00304951A US 3776216D A US3776216D A US 3776216DA US 3776216 A US3776216 A US 3776216A
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United States
Prior art keywords
oven
locking
timer
cleaning
heat
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00304951A
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English (en)
Inventor
R Pirker
R Kelchner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication date
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Publication of US3776216A publication Critical patent/US3776216A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/02—Doors specially adapted for stoves or ranges
    • F24C15/022—Latches
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type

Definitions

  • ABSTRACT In apparatus for automatically heat-cleaning the interior surfaces of an oven having a locking member for locking the oven door during the cleaning process; a timer for controlling the cleaning operation; a blocking device for maintaining the door in its locked position during the operation; and a bimetal control device connected to the timer and the blocking device for actuating the blocking device and for preventing the timer from being reset after the cleaning operation has begun and while the temperature in the oven remains above a certain value.
  • the present invention frelates to kitchen ranges, particularly ranges provided with devices for automatically cleaning the interior surfaces of the oven, such as disclosed in US Pat. No. 3,625,197, issued to Priker et al; on Dec. 7, 1971.
  • a locking device is provided for locking the oven door during the cleaning operation and includes a locking element which is held under spring tension and which can be brought into its locking position relative to the oven door when the cleaning operation is initiated.
  • Such apparatus is generally equipped with a timer which controls the cleaning operation and which works incooperation with the locking device.
  • a blocking device is alsoprovided for holding the locking element in position during the cleaning operation.
  • a kitchen range of this type the locking element is held in its locked position during the heat-cleaning process, after being inserted into the oven door, by means of a bimetal control device, so that the oven door cannot be opened.
  • the timer switch used in this type of kitchen range is generally designed so that a friction coupling or similar device permits the winding knob, whichis disposed insidethe timer for winding the same to beturned in both directions.
  • Such a bidirectional device is of particular advantage when the operation and manipulation of the timer on the kitchen range is being demonstrated.
  • this device in the timer has the drawback that the time period set for a heat-cleaning process can be accidentally changed by turning forward the timer switch. This would result in a lengthening of the time period during which the oven is heated to the high cleaning temperature which could produce serious damage to the. equipment.
  • An object of the present invention is to prevent any possible resetting of the timer during the cleaning period and thus an increase in the set time period for the heat-cleaning process.
  • timer switch itself as a blocking device for the locking element in such a way that the bimetal device causes a blocking of the timer switch against forward rotation when the temperature of the oven is within a defined range above a set value.
  • the advantages realized with the present invention are mainly that while the oven temperature is in this definedrange, it is possible to securely lock the oven door as well as simultaneously prevent turning of the timer forward to its wound position.
  • FIG. 1 is a cross sectional plan view of an oven timer provided with blocking elements in accordance with the present invention.
  • FIG. 2 is a front elevational view of a portion of the structure of FIG. 1, with plate 30 and knob 4 removed, with the blocking elements in their rest position.
  • FIG. 3 is a view similar to that of FIG. 2 with the blocking elements in the operating position.
  • FIG. 4 is a cross-sectional side view of an oven locking system including the timer of FIG. 1 in operating connection with a locking device for the door of an oven according to the present invention.
  • FIG. 5 is a schematic circuit diagram of the heater control circuit for the embodiment of FIGS. 1-4.
  • FIG. 1 shows in cross section a timer for controlling the self-cleaning operation of an oven.
  • the timing mechanism together with the winding mechanism of the timer is disposed between two supporting plates 1 and 2 which are clamped together by means of screw bolts (not shown).
  • An actuating shaft 3 which passes through the supporting plates 1 and 2 serves to wind the timer switch. Movement of a rotary knob 4 fastened on the actuating shaft 3 causes rotation of the shaft and thus winding of the timer.
  • a toothed wheel 5 which is mounted on the actuating shaft 3 engages a driving gear 7 mounted on a shaft 6 which'is supported by the two 1 supporting plates 1 and 2.
  • Toothed wheel 5 drives the driving gear 7 when the actuating shaft 3 is rotated.
  • One end of shaft 6 is mounted in supporting plate 1 in an elongated bearing hole 6' and is biased towards the left side of the elongated bearing hole by means of a pressure spring 6" which is fastened to supporting plate 1.
  • a toothed wheel 8 is mounted on shaft 6 to be rotatable relative thereto and is guided by friction disc springs 9,9. The association of the friction springs 9,9 with the toothed wheel 8 to produce a clutch-type friction coupling results in the advantage that the toothed wheel 8 can be rotated, independent of the driving gear 7, in a clockwise as well as a counterclockwise direction.
  • the toothed wheel 8 guided by friction springs 9,9 is arranged in engagement with a pinion 10, mounted on a shaft 11 which is also mounted in supporting plates 1, 2.
  • the structure described thus far is identical with that shown in FIG. l4 of US. Pat. No. 3,625,197.
  • Pinion l2 cooperates with a device which will be described below for blocking the actuating shaft 3 in the forward time setting direction.
  • a conventional clock spring 14 is mounted on the end portion 13 of the actuating shaft 3 which passes.
  • the pinion 12 which is partially accommodated within a guide sleeve 17 mounted in supporting plate 2 and cooperates with a small toothed wheel 18 disposed in front of the supporting plate 2.
  • the toothed wheel 18 is connected to a driving pinion 19.
  • the driving pinion 19 is mounted on a bearing shaft 20, the end of which is mounted in a two-armed rocker 22.
  • the two-armed rocker 22 is additionally pivotally mounted on the guide sleeve 17 mounted in supporting plate 2.
  • sleeve 17 is the stationary fulcrum for pivotal movement of rocker 22.
  • an upwardly facing abutment surface 24 is disposed on one arm 23 of the two-armed rocker 22.
  • a spring arm 26 of a twoarmed spring 27 acts from above in a downward direction on the other arm 25 of rocker 22 which is opposite the abutment surface 24.
  • a bentover abutment flap 28 (FIG. 1) is provided for enabling the engagement of the spring arm 26 with the rocker 22.
  • the driving pinion 19 is in operative connection with an eccentric cam disc 29 having cam 29. A portion of the periphery of disc 29 is provided with teeth 42.
  • the cam disc 29 is also fastened to actuating shaft 3.
  • a safety plate 30 (FIG. 1) covers the front portion of the abovementioned parts of this device on the side facing the rotary knob 4. The safety plate 30 is connected to the supporting plate 2 while leaving a space 43 for installation of the above described blocking device.
  • the abutment surface 24 of rocker 22 is arranged to be operatively associated with a movable abutment pin 31.
  • Pin 31 which is mounted in the free end of a deflecting bimetal strip 32, is designed to be adjustable in height to achieve proper operating alignment.
  • the bimetal strip 32 is fastened to a block portion 33 having a large mass and made of a good heat conducting material. Strip 32 is connected therewith in a good heat conducting relationship.
  • An electrical heating element 34 is associated with the block portion 33.
  • Elements 32,33 and 34 form a bimetal control unit which constitutes a structural unit with the timer. As shown in FIG. 5, the heating element 34 is connected in series with the heating circuit of an oven heating mechanism 35, which circuit is controlled by the switching contacts 16 of the timer. This arrangement assures that the heating element 34 whose operation will be described below, can receive a heating voltage only when the oven heating mechanism 35 has also been switched on.
  • the oven heating element 35 is switched on by the oven switch I 35' which is connected
  • FIG. 4 provides a partial side view of the front section of the oven including the timer, the actuating mechanism and the locking device.
  • actuating shaft 3 When the actuating shaft 3 is rotated for the purpose of winding the clock spring 14 a locking slide member 38 which is normally biased upwards by spring 53, is simultaneously actuated via an eccentric disc 37 fastened on actuating shaft 3.
  • This locking slide 38 is moved downwardly by the disc 37 and engages slot 54 of the door 39 of a partially shown oven 40 and locks the door during the heat cleaning period, (i.e., while the timer, which controls the sequence of the heat-cleaning process, runs down,) thus preventing the door from being opened during this period.
  • the driving pinion l9 rests on top of the cam 29 of the eccentric cam disc 29 when the rotary knob 4 is in the zero time, or starting, position.
  • the two-armed rocker 22 which cooperates with the toothed wheel 18 of the driving pinion 19 via pinion 12 is in an approximately horizontal position.
  • the bimetal strip 32 which is initially unheated is in an extended position, where its free end is in its lowermost position.
  • Driving pinion 19 first moves without interference along the smooth running surface 41 following cam 29'. With continued rotation of the eccentric cam disc 29, the portion of the cam disc which has a slightly smaller diameter then lies opposites the driving pinion 19.
  • the rotary knob 4 of the winding mechanism of the timer can now be turned in the forward winding or backward resetting direction without interference because of the action of friction springs 9, 9' since the backward movement of rotary knob 4 causes the toothed wheel 8 to slide between friction springs 9, 9' and consequently rotation of the knob is not blocked.
  • the clock spring 14 can be wound up as often and as completely as desired and also can be reset to zero again at any time by rotating the rotary knob 4 back to its starting position.
  • the heating circuit of a device for example an electric oven with a device for automatically heat-cleaning the oven
  • rotation of the rotary knob 4 will close the switching contacts 16 disposed in the heating circuit of the oven heating mechanism 35 through the cams on the abutment discs 15, 15' as soon as a certain range of rotation has been traversed. Closing of the switching contacts 16 simultaneously applies voltage to the heating element 34 for heating the block portion 33.
  • This heating element 34 is connected in series with the oven heating mechanism 35 and with the switching contacts 16 and consequently is controlled in dependence upon the heat being applied in the oven.
  • the block portion 33 is only slowly heated however due to its large mass so that the bimetallic strip 32 fastened to the block portion 33 will bend upwardly only after a certain period of time, as shown in FIG. 3.
  • the shift in the position of the bimetal strip causes the abutment pin 31 to be moved upwardly which relieves the restraint on arm 23.
  • the two-armed rocker 22 which is under compression pressure from the two-armed spring 27 and in whose rocker arm 25 the toothed wheel 18 is mounted with the driving pinion 19, can now be pivoted in such a way that the position of the driving pinion 19 is shifted so that the pinion 19 engages the teeth 42 of cam disc 29.
  • the pivoted driving pinion 19 is now coupled with the cam disc 29.
  • the resulting efiect of this operation is the cancellation or bridging, of the force of the friction springs 9, 9' on the driving gear 7 which is disposed on shaft 6 and cooperates with toothed wheel 5 of the actuating shaft 3.
  • the block portion 33 is designed as a heat storage block, it is advantageously accomplished that even when the current is interrupted the rotary knob 4 still can not be turned ⁇ back for a certain period of time since the bimetallic strip 32 is still being heated and consequently is bent upwardly Rocker 22, therefore, positively remains in the pivoted position and the driving pinion 19 remains in engagement with teeth 42 of the eccentric cam disc 29. If after a certain period of time, the blocking portion 33 has sufficiently cooled the bimetallic strip 32 returns to its horizontal starting position and thus allows the rocker to return to its horizontal position with its abutment pin 31, mounted in the bent-out end, acting downwardly on the abutment surface 24 of the rocker arm 23 of rocker 22.
  • a locking control system comprising, in combination: timing means for controlling the operation of the heat-cleaning apparatus and arranged to be operatively connected with the locking member; blocking means connected to said timing means and arranged to be operatively connected with the locking member for holding the locking member in its locked position for a defined period of time; and bimetal control means connected for actuating said blocking means and for preventing said timing means from being reset while the temperature in the oven is above a defined value.
  • a device as defined in claim 11 further comprising an actuating shaft and means friction coupling said shaft to said timing means, and wherein said bimetal control means bridges said friction coupling means.
  • a device as defined in claim 1 wherein said bimetal control means includes an independent heating element and means for controlling said heating element in dependence upon the temperature of the oven.
  • timing means and said bimetal control means fomi a structural Unit.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cookers (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Ovens (AREA)
US00304951A 1971-11-09 1972-11-09 Self-cleaning oven Expired - Lifetime US3776216A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2155570A DE2155570C3 (de) 1971-11-09 1971-11-09 Zeitschalter zum Steuern des Hitzereinigungsvorganges bei Küchenherden

Publications (1)

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US3776216A true US3776216A (en) 1973-12-04

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US00304951A Expired - Lifetime US3776216A (en) 1971-11-09 1972-11-09 Self-cleaning oven

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US (1) US3776216A (de)
AT (1) AT320094B (de)
CH (1) CH541916A (de)
DE (1) DE2155570C3 (de)
FR (1) FR2159379B1 (de)
GB (1) GB1404215A (de)
IT (1) IT970316B (de)
SE (1) SE385497B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4013312A (en) * 1975-12-05 1977-03-22 Roper Corporation Latch mechanism for self-cleaning oven
US4032180A (en) * 1973-08-21 1977-06-28 Texas Instruments Incorporated Locking device for washing machine door
US4862870A (en) * 1988-12-21 1989-09-05 General Electric Company Bimetal lock arrangement for a self-cleaning oven latch
US6474702B1 (en) 2000-08-16 2002-11-05 France/Scott Fetzer Company Range door lock with nuisance latch

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110928202A (zh) * 2018-08-31 2020-03-27 佛山市顺德区美的电热电器制造有限公司 烹饪设备的信息处理方法及装置、烹饪设备、存储介质

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313918A (en) * 1964-08-04 1967-04-11 Gen Electric Safety means for oven door latching mechanism
US3416515A (en) * 1965-10-22 1968-12-17 Essex Wire Corp Door latching actuator assembly
US3469568A (en) * 1968-05-31 1969-09-30 Roper Corp Geo D Door locking means and associated control circuit for self-cleaning oven
US3638638A (en) * 1970-05-26 1972-02-01 Westinghouse Electric Corp Latching and locking arrangement for self-cleaning oven door

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313918A (en) * 1964-08-04 1967-04-11 Gen Electric Safety means for oven door latching mechanism
US3416515A (en) * 1965-10-22 1968-12-17 Essex Wire Corp Door latching actuator assembly
US3469568A (en) * 1968-05-31 1969-09-30 Roper Corp Geo D Door locking means and associated control circuit for self-cleaning oven
US3638638A (en) * 1970-05-26 1972-02-01 Westinghouse Electric Corp Latching and locking arrangement for self-cleaning oven door

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4032180A (en) * 1973-08-21 1977-06-28 Texas Instruments Incorporated Locking device for washing machine door
US4013312A (en) * 1975-12-05 1977-03-22 Roper Corporation Latch mechanism for self-cleaning oven
US4862870A (en) * 1988-12-21 1989-09-05 General Electric Company Bimetal lock arrangement for a self-cleaning oven latch
US6474702B1 (en) 2000-08-16 2002-11-05 France/Scott Fetzer Company Range door lock with nuisance latch

Also Published As

Publication number Publication date
DE2155570C3 (de) 1975-10-02
GB1404215A (en) 1975-08-28
SE385497B (sv) 1976-07-05
DE2155570B2 (de) 1975-02-20
DE2155570A1 (de) 1973-05-17
CH541916A (de) 1973-09-15
FR2159379B1 (de) 1976-04-23
AT320094B (de) 1975-01-27
FR2159379A1 (de) 1973-06-22
IT970316B (it) 1974-04-10

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