US3566078A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warmup demand limiter for a boiler or the like
Assignee: Automatic Steam Products Corp
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Filing: 1968-12-04
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Granted: 1971-02-23
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Expires: 1988-12-04
Abstract
Abstract A demand limiter is operatively interposed between the system actuator of a control system and a predetermined number of a plurality of load elements. In the period following system actuation until the system attains a predetermined condition dependent upon the operation of the load elements, that predetermined number of load elements, as a result of the operation of the demand limiter, will be disconnected from the system actuator, thereby to limit the number of load elements capable of being energized during system warmup, and thus limiting the initial system demand on the external energy source.
Inventors
- 👤 Eric S Krackow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:52
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; H; H02; H02J; H02J3/00; H02J3/12; H02J3/14; H02J2105/00; H02J2105/50; H02J2105/52; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222; Y04S20/242; Y04S20/244
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
139 words
In combination with a control system comprising a plurality of load elements, an energy source, means for sensing a given condition dependent upon the operation of said load elements, and control means operatively connected between said sensing means and said load elements and effective to selectively energize said load elements in accordance with said sensed condition so as to tend to cause said sensed condition to attain a desired value; the improvement which comprises: load limiting means operatively connected to said load elements and effective to be actuated upon the energization to cause some but not all of said load elements to be deenergized despite the action of said control means, and terminating means operatively connected between said condition sensing means and said load-limiting means and effective to deactuate the latter when said sensed condition attains a predetermined value.
Claim 2
Dependent Claim
139 words
In combination with a control system comprising a plurality of load elements, an energy source, means for sensing a given condition dependent upon the operation of said load elements, and control means operatively connected between said sensing means and said load elements and effective to selectively energize said load elements in accordance with said sensed condition so as to tend to cause said sensed condition to attain a desired value; the improvement which comprises: load limiting means operatively connected to said load elements and effective to be actuated upon the energization to cause some but not all of said load elements to be deenergized despite the action of said control means, and terminating means operatively connected between said condition sensing means and said load-limiting means and effective to deactuate the latter when said sensed condition attains a predetermined value.
Claim 3
Dependent Claim
20 words
The combination of claim 1, in which said sensed condition is temperature and said load elements are electrical heating elements.
Claim 4
Dependent Claim
16 words
The combination of claim 2, in which said desired value is greater than said predetermined value.
Claim 5
Dependent Claim
67 words
The combination of claim 3, in which said load elements are electrically energized, said load-limiting means comprises a plurality of switches between said energy source and said some of said load elements, and switch actuating means effective upon said system energization to open said switches said terminating means being connected to said switch actuating means and effective when actuated by said sensing means to close said switches.
Claim 6
Dependent Claim
35 words
The combination of claim 4, in which said control means comprises a plurality of sequentially actuated switches associated with said some of said load elements and electrically connected in series with said load-limiting means switches.
Claim 7
Dependent Claim
41 words
The combination of claim 5, further comprising switch means controlled by said load-limiting means switches for maintaining said switches in their actuated condition after said sensed condition has reached its predetermined condition and said switches are actuated by said terminating means.
Claim 8
Dependent Claim
41 words
The combination of claim 4, further comprising switch means controlled by said load-limiting means switches for maintaining said switches in their acTuated condition after said sensed condition has reached its predetermined condition and said switches are actuated by said terminating means.
Claim 9
Dependent Claim
16 words
The combination of claim 1, in which said desired value is greater than said predetermined value.
Claim 10
Dependent Claim
67 words
The combination of claim 8, in which said load elements are electrically energized, said load-limiting means comprises a plurality of switches between said energy source and said some of said load elements, and switch actuating means effective upon said system energization to open said switches, said terminating means being connected to said switch actuating means and effective when actuated by said sensing means to close said switches.
Claim 11
Dependent Claim
36 words
The combination of claim 8, in which said control means comprises a plurality of sequentially actuated switches associated with said some of said load elements and electrically connected in series with said load limiting means switches.
Claim 12
Dependent Claim
41 words
The combination of claim 8, further comprising switch means controlled by said load-limiting means switches for maintaining said switches in their actuated condition after said sensed condition has reached its predetermined condition and said switches are actuated by said terminating means.
Claim 13
Dependent Claim
27 words
The combination of claim 8, in which said some of said load elements comprises between 50 and 75 percent of the total number of said load elements.
Claim 14
Dependent Claim
27 words
The combination of claim 1, in which said some of said load elements comprises between 50 and 75 percent of the total number of said load elements.
Claim 15
Dependent Claim
20 words
The combination of claim 13, in which said sensed condition is temperature and said load elements are electrical heating elements.
Claim 16
Dependent Claim
67 words
The combination of claim 1, in which said load elements are electrically energized, said load-limiting means comprises a plurality of switches between said energy source and said some of said load elements, and switch actuating means effective upon said system energization to open said switches, said terminating means being connected to said switch actuating means and effective when actuated by said sensing means to close said switches.
Claim 17
Dependent Claim
36 words
The combination of claim 15, in which said control means comprises a plurality of sequentially actuated switches associated with said some of said load elements and electrically connected in series with said load limiting means switches.
Claim 18
Dependent Claim
41 words
The combination of claim 15, further comprising switch means controlled by said load-limiting means switches for maintaining said switches in their actuated condition after said sensed condition has reached its predetermined condition and said switches are actuated by said terminating means.
Claim 19
Dependent Claim
40 words
The combination of claim 16, further comprising switch means controlled by said load-limiting means switches for maintaining said switches in their actuated condition after said sensed condition has reached its predetermined condition and said switches are actuated by terminating means.
Claim 20
Dependent Claim
24 words
In the combination of claim 1, manual control means operatively connected to said load-limiting means and effective when normally actuated to disable the latter.
Claim 21
Dependent Claim
20 words
The combination of claim 19, in which said sensed condition is temperature and said load elements are electrical heating elements.
Claim 22
Dependent Claim
24 words
In the combination of claim 4, manual control means operatively connected to said load-limiting means and effective when manually actuated to disable the latter.
Claim 23
Dependent Claim
24 words
In the combination of claim 15, manual control mean operatively connected to said load-limiting means and effective when manually actuated to disable the latter.
Claim 24
Dependent Claim
134 words
A control circuit for controlling the condition at a system load, said circuit comprising a plurality of load elements, an energy source, means for sensing the load condition determined by the operation of said load elements, a plurality of sequentially operated switches operatively connected between said source and said load elements and effective when actuated to operatively energize said load elements in accordance with the sensed load condition to tend to establish a desired load condition, normally open load-limiting switch means operatively connected between said energy source and some, but not all of said load elements, and an actuator effective when energized to close said load-limiting switches, said condition sensor means being effective when the load condition reaches a predetermined value to operatively connect said actuator to said source, thereby to energize said actuator.
Claim 25
Dependent Claim
134 words
A control circuit for controlling the condition at a system load, said circuit comprising a plurality of load elements, an energy source, means for sensing the load condition determined by the operation of said load elements, a plurality of sequentially operated switches operatively connected between said source and said load elements and effective when actuated to operatively energize said load elements in accordance with the sensed load condition to tend to establish a desired load condition, normally open load-limiting switch means operatively connected between said energy source and some, but not all of said load elements, and an actuator effective when energized to close said load-limiting switches, said condition sensor means being effective when the load condition reaches a predetermined value to operatively connect said actuator to said source, thereby to energize said actuator.
Claim 26
Dependent Claim
34 words
The control circuit of claim 23, comprising manually controlled bypass switch means operatively connected to said source and to said actuator and effective when actuated to energize said actuator irrespective of the load condition.
Claim 27
Dependent Claim
26 words
The control circuit of claim 24, in which a manually actuated switch means is in effective series circuit relation with said energy source and said actuator.
Claim 28
Dependent Claim
26 words
The control circuit of claim 23, in which a manually actuated switch means is in effective series circuit relation with said energy source and said actuator.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |