IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0610225
(1984-05-14)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Grace, C. H.Johnston, R. A.
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인용정보 |
피인용 횟수 :
15 인용 특허 :
2 |
초록
▼
A control system and programmer/timer for a microwave oven having a program cam advanced by a pawl-stepped ratchet wheel having three toothed segments, each with teeth of differing root diameter. The outer teeth provide rapid expanded scale advancement for the terminal five minutes of the cooking pr
A control system and programmer/timer for a microwave oven having a program cam advanced by a pawl-stepped ratchet wheel having three toothed segments, each with teeth of differing root diameter. The outer teeth provide rapid expanded scale advancement for the terminal five minutes of the cooking program and also for selected programs of five minutes or less for high-resolution switching by the program cam. The segment of teeth of intermediate root diameter provides a compressed scale slower cam advance rate for "COOK" programs of 5-35 minutes. The segment of teeth of lowest root diameter provides slow rate cam advancement for auxiliary "DELAYED START" and KEEP-WARM functions where time accuracy is not critical. The programmer/timer enables continued advancement of the program cam after time-out of the cooking program where the KEEP-WARM mode has been preselected.
대표청구항
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1. An electromechanical programmer timer for controlling energization of an electrical appliance comprising: (a) motor means operative upon connection to a source of electrical power to provide rotation of a motor shaft; (b) pawl means operatively connected to said motor shaft for oscillatory mov
1. An electromechanical programmer timer for controlling energization of an electrical appliance comprising: (a) motor means operative upon connection to a source of electrical power to provide rotation of a motor shaft; (b) pawl means operatively connected to said motor shaft for oscillatory movement upon energization of said motor means; (c) program cam means operable upon operator positioning and subsequent advancement for effecting a selected timed program of appliance function; (d) advance means including ratchet means engaged by said pawl means, said ratchet means being operative to advance said cam means step-by-step upon said oscillatory motion of said pawl means, said ratchet means including a rotatable member having; (i) a segment of peripheral teeth having a first root diameter for providing expanded scale advancement; (ii) a segment of peripheral teeth having a second root diameter less than said first root diameter for auxiliary function scale advancement; (iii) a segment of peripheral teeth having a third root diameter intermediate said first and second root diameters for compressed scale advancement; (d) masking means operable to permit said pawl means to advance said cam means at a first expanded scale rate corresponding to the rate of oscillation of said pawl means when said pawl means engages the teeth of said first root diameter, said masking means operable to permit said pawl means to engage said teeth of said third root diameter only once out of a first predetermined number of oscillations of said pawl means giving said cam means a second rate of advance equal to said expanded scale rate multipled by the reciprocal of said first predetermined number, said masking means further operable to permit said pawl means to engage said teeth of said second root diameter only once out of a second predetermined number of oscillations of said pawl means, said second number being greater than said first predetermined number, giving said cam means a third rate of advance said expanded rate multiplied by the reciprocal of said second predetermined number; and, (e) switch means operatively responsive to advance of said cam means to sequentially energize and de-energize said motor means and said appliance in accordance with said selected program. 2. The programmer timer defined in claim 1, wherein: (a) said ratchet means rotatable member comprises an advance ratchet wheel; and, (b) said masking means comprises a masking ratchet wheel mounted for rotation about a common axis with said rotatable member, said masking ratchet having peripheral teeth of the same root diameter as said advance ratchet teeth first root diameter and having a plurality of deep notches spaced along the periphery thereof at intervals corresponding to the pitch of said first root diameter teeth multiplied by said first predetermined number, said deep notches having the root diameter thereof corresponding to that of said third root diameter teeth, said masking ratchet having at least one very deep notch provided on the periphery thereof at intervals corresponding to the pitch of said second root diameter teeth multiplied by said first predetermined number, said very deep notches having the root diameter thereof corresponding to that of said second root diameter teeth. 3. The programmer timer defined in claim 1, wherein said rotary means includes a cam wheel having first, second and third cam surfaces formed on the periphery thereof for effecting said sequenced operation of said switch means. 4. The programmer timer defined in claim. 1, wherein: (a) said rotary cam means includes a cam wheel having first, second and third level cam surfaces on the periphery of said wheel; (b) said switch means includes cam follower means operable upon contacting said first level cam surface to cause said switch means to be in the open circuit condition and upon said cam means being advanced to cause said cam follower means to contact said second level cam surface, said switch means closes a first circuit to energize said motor means and upon said motor means and pawl means advancing said cam means to cause said cam follower means to contact said third level cam surface, said cam follower effects operation of said switch means for closing a second circuit adapted for energizing said electrical applicance. 5. The programmer timer defined in claim 1, wherein said ratchet means segment having said second root diameter teeth has a toothless sub-segment intermediate the ends thereof wherein upon said masking means permitting said ratchet pawl means to engage said second root diameter teeth and upon desired advancement therealong to said toothless sub-segment, said cam means is effective to cause said switch means to go open circuit for de-energizing said motor means and said external electrical appliance. 6. An electromechanical programmer timer for controlling energization of an electrical appliance comprising: (a) motor means operable upon connection to a source of electrical power to provide timed rotation of a power shaft; (b) switch means operable upon actuation and deactuation to energize and de-energize said motor means and said appliance; (c) cam means operable operator intitial positioning and upon timed advancement to actuate and deactuate said switch means in accordance with a selected program; (d) advance means connected to said power shaft and operable to advance said cam means in accordance with a selected program; (i) oscillating pawl means, (ii) a ratchet wheel having plural segments of ratchet teeth for engagement by said pawl means with a first segment of teeth having a first root diameter for rapid advance, a second segment of teeth having a second root diameter significantly less than said first segment teeth, a third segment of teeth having a third root diameter intermediate said first and second root diameters, (iii) masking means operable upon operator selection of a desired program having a timed interval greater than a predetermined minimum to cause said pawl means to engage said third segment of teeth for indexing therealong, said masking means operable, upon operator selection of and time down to a program interval less than said minimum, to cause said pawl means to engage said first segment of teeth for rapid advance of said cam means during time-out of the remainder of said interval, said masking means operable upon operator selection of an auxiliary mode function position of said cam means to cause said pawl to engage said second segment teeth for indexing therealong, said masking means further operative to cause said pawl to contact said second segment teeth upon time-out of said selected program interval. 7. An appliance control system comprising: (a) electrical appliance function means operable upon electrical energization to perform an appliance function; (b) a motor operable upon electrical energization to provide power to a rotary shaft means; (c) switch means operable upon actuation and deactuation to energize said motor means and said appliance function means; (d) program cam means selectively positionable by the appliance operator to an initial position corresponding to a selected program and operable upon advancement to actuate and de-actuate said switch means in accordance with said program; and, (e) advance means connected to receive power from said shaft means and operable to advance said cam means from said initial position for accomplishing said program to a timed-out position, wherein upon said operator selection of an initial cam position corresponding to a program time interval less than a predetermined minimum, said advance means is operable to advance said cam means at a first expanded scale rate to provide a fastest rate of cam advancement, and upon operator selection of an initial cam position corresponding to a program time interval greater than said minimum, said advance means is operable to advance said cam means at a compressed scale rate substantially slower than said expanded scale rate, said advance means further operable, upon operator selection of an auxiliary mode cam means position, to effect actuation of said switch means to initially energize said motor means and advance said cam means at a rate slower than said compressed scale rate for effecting selected delayed actuation of said switch means to energize said function means. 8. The control system defined in claim 7, further comprising: (a) subinterval switch means; and, (b) sub-interval cam means receiving power from said shaft means and operable to actuate and deactuate said subinterval switch means at predetermined sub-intervals of the selected programs interval for providing sub-interval appliance function during said auxiliary mode slowest advancement of said cam means. 9. The control system defined in claim 7, wherein said advance means includes: (a) a ratchet wheel having a first segment of teeth of a first root diameter for said expanded scale advance rate, a second segment of teeth of a second root diameter less than said first root diameter for said compressed scale advance rate, a third segment of teeth of a third root diameter intermediate said first and second root diameters for an advance rate intermediate said expanded scale and said compressed scale advance rates; (b) pawl means connected to said shaft and operable to oscillate upon rotation of said shaft means and for engagement of said ratchet teeth; and, (c) masking means operable upon operator selection of a program interval less than said minimum to permit said pawl means to engage said first segment of ratchet teeth for step advancement of said cam means with each oscillation of said pawl means, said masking means operable upon operator selection of a program interval of at least said minimum, to permit said pawl means to engage said third segment of ratchet teeth only once upon each of a first multiple of said pawl oscillations, said masking means further operable upon operator selection of said auxiliary mode function to engage said third segment of ratchet only once upon each of a second multiple of said pawl oscillations, said second multiple being greater than said first multiple. 10. The control system defined in claim 7, wherein said first, second and third teeth segments have a common tooth pitch. 11. An electromechanical programmer timer for controlling an electrical appliance comprising: (a) motor means operable upon connection to a source of electrical power to provide rotation of a shaft means; (b) load switch means adapted for, upon actuation and deactuation to energize and de-energize said appliance from a source of power; (c) timing switch means operable upon actuation and deactuation to energize and de-energize said motor means and third switch means electrically in parallel with said first switch means (d) program cam means selectably positionable at an initial position by the appliance operator and operable upon timed advancement to provide a preselected program of actuation and deactuation of said first and second switch means; (e) advance means operable, upon rotation of said shaft means to provide sequential advancement of said cam means from said initial position for said selected interval to a timed-out position in which said load and timing switch means are deactuated; (f) sub-interval cam means operable in response to rotation of said shaft means to actuate and deactuate said third switch means at for a predetermined fraction of the period of rotation of said shaft; (g) said advance means including delay means operable, upon operator selection of an auxiliary function initial position of said cam means, to actuate said timing switch means and advance said program cam means at a slowest rate for a selected interval before actuating said load switch means, whereupon said program cam means is advanced at a faster rate for an appliance program interval, wherein as said program interval is timed out, said advance means is operative to advance said program cam means at a fastest rate for time-out of a predetermined terminal portion of said program interval, said fastest rate of advance of said program cam means. 12. The programmer timer defined in claim 11, wherein said advance means includes a ratchet wheel and pawl means connected to said shaft means and engaging said ratchet, and operable to oscillate for indexing said ratchet upon rotation of said shaft, said ratchet wheel having a first segment of teeth of a first root diameter, a second segment of teeth of a second root diameter and a third segment of teeth of a third root diameter, said advance means further including a masking ratchet operable to permit said pawl to engage said first segment teeth with each oscillation thereof, said masking ratchet operable to permit said pawl to engage said second segment teeth only once for each of a first multiple of said oscillations, said masking means operable to permit said pawl to engage said third segment teeth only once for each of a second multiple of said oscillations, wherein said second multiple is greater than said first multiple. 13. The programmer timer defined in claim 12 further comprising: (a) an auxiliary function switch operable upon actuation and deactuation to shunt said load switch for energizaing and de-energizing said appliance; and, (b) sub-interval cam means connected for rotation by said shaft means and operable to actuate and deactuate said auxiliary function switch for an interval not exceeding a minor function of the selected appliance program interval. 14. An electromechanical programmer timer for an electrically energized appliance comprising: (a) timing motor means operable to provide rotation of a shaft means at a predetermined rate; (b) a load switch operable for actuation and deactuation and adapted for energizing and de-energizing an appliance; (c) timing switch operable upon actuation and deactuation to energize and de-energize said motor means; (d) program cam means operator positionable at a selected initial position and operable upon timed advancement to actuate and deactuate said switches for providing a selected program of appliance operation; and, (e) advance means connected to said shaft means and operable, upon rotation of said shaft means, to step-index said program cam means from said initial position to a timed-out position, for providing the selected program interval said advance means operable in response to a first mode of initial position of said cam means corresponding to minimum program intervals to advance said program cam means at a first expanded rate for time-out, said advance means, in response to a second mode of initial positions of said program cam means corresponding to program intervals greater than said first mode, operable to advance said program cam means at a second rate less than said first rate, said advance means, in response to a third mode of initial positions of said program cam means corresponding to an auxiliary mode function program, operable to advance said program cam means at a third rate, wherein for said third mode initial positions, said motor switch means is actuated and actuation of said load switch means is delayed thereafter until elapse a selected interval. 15. An electromechanial programmer timer for an electrically energized appliance comprising, (a) timing motor means operable to provide rotation, of a shaft means at a predetermined rate; (b) a motor switch operable upon actuation and deactuation to energize and de-energize said motor means; (c) a load switch operable for actuation and deactuation and adapted for energizing and de-energizing said appliance; (d) program cam means selectively positionable by the operator of said appliance to an initial position and operable upon timed advancement to actuate and deactuate said switches for providing a selected program of appliance operation; (e) an auxiliary function switch operable upon actuation to shunt said load switch; (f) advance means connected to said shaft means and operable upon rotation of said shaft means to step-index said program cam means for the selected program interval from said initial position to a timed-out position, said advance means operable in a first mode of initial positions of said program cam means corresponding to a minimum program interval to advance said program cam means at a first expanded rate for time-out, said advance means in response to a second mode of initial positions of said program cam means is operable to advance said program cam means at a second compressed rate less than said first rate, said advance means upon time-out of said selected program interval, operable to advance said program cam means at a third rate for time-out of an auxiliary function interval; and, (g) sub-interval cam means connected for rotation by said shaft means and operable to actuate and deactuate said auxiliary function switch for intervals comprising a fraction of the period of rotation of said shaft means, wherein said cam means is operable upon program time-out and advancement at said third rate and time-out of said auxiliary interval to effect deactuation of all of said switch means.
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