US3570446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire detection alarm means
Assignee: Emdeko Distributing Inc
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Filing: 1968-09-23
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Granted: 1971-03-16
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Expires: 1988-09-23
Abstract
Abstract A fire detection alarm means in which one or more hammers (and speed governors) have pivotal connections to a rotatable driven member and are held by an arcuate wall in backfolded, coiled, or cocked position with respect to the direction of rotation of the driven member for movement through a preselected angle, said arcuate wall ending in spaced relation to a sound pin for permitting uncoiling or uncocking of said hammer member in response to centrifugal forces with increased speed to strike said sound pin to forcibly drive the pin against a sound shell or bell.
Inventors
- 👤 Wesley E Buford
- 👤 Charles G Buford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:14
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11; G08B17/113
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
189 words
In a fire detection alarm means, the combination of: an outer rotatable shell means adapted to be struck to produce an alarm sound; an inner nonrotatable sealed unit received within said shell and comprising an inner housing and a base member; a sounding pin slidably mounted on said inner housing and movable to strike the shell means; drive means within said inner housing and connected to and energized by rotation of said outer shell member; strike means within said inner housing for repetitively striking one end of said pin and for controlling discharge of energy from said drive means; said strike means including a driven member rotatable by said drive means, a hammer member having a pivotal connection on said driven member for pivotal movement relative thereto; and means to maintain said hammer in a cocked position during movement of said driven member through a selected angle of rotation and to release said hammer at a selected position in the path of rotation of said driven member whereby said hammer will be thrown against said pin at a speed greater than the speed of rotation of the driven member.
Claim 2
Dependent Claim
189 words
In a fire detection alarm means, the combination of: an outer rotatable shell means adapted to be struck to produce an alarm sound; an inner nonrotatable sealed unit received within said shell and comprising an inner housing and a base member; a sounding pin slidably mounted on said inner housing and movable to strike the shell means; drive means within said inner housing and connected to and energized by rotation of said outer shell member; strike means within said inner housing for repetitively striking one end of said pin and for controlling discharge of energy from said drive means; said strike means including a driven member rotatable by said drive means, a hammer member having a pivotal connection on said driven member for pivotal movement relative thereto; and means to maintain said hammer in a cocked position during movement of said driven member through a selected angle of rotation and to release said hammer at a selected position in the path of rotation of said driven member whereby said hammer will be thrown against said pin at a speed greater than the speed of rotation of the driven member.
Claim 3
Dependent Claim
49 words
In a device as stated in claim 1 wherein said hammer member includes a shank portion and a head portion, said shank portion having at one end said pivotal connection to said driven member, and said head portion having a weight greater than said weight of the shank portion.
Claim 4
Dependent Claim
24 words
In a device as stated in claim 1 wherein one of said hammer members is pivotally mounted at each end of said driven member.
Claim 5
Dependent Claim
41 words
In a device as stated in claim 2 wherein, in hammer-cocked position, the distances between the center of mass of said head portion, the pivotal axis of said hammer member, and the pivotal axis of said driven member are substantially equal.
Claim 6
Dependent Claim
50 words
In a device as stated in claim 4 wherein said means for cocking said hammer positions the center of mass of said head portion from said drive axis the same distance as the center of mass of said head portion is spaced from the pivotal axis of said hammer member.
Claim 7
Dependent Claim
28 words
In a device as stated in claim 1 wherein said means for maintaining said hammer member in cocked position frictionally engages and restrains rotation of said driven member.
Claim 8
Dependent Claim
86 words
In a device as stated in claim 1 wherein an end face of said hammer member in normal retracted position lies along a diameter passing through the drive axis of said link member, said hammer member being confined by said position maintaining means through an arcuate path extending beyond a diameter normal to said first-mentioned diameter whereby upon release of said head portion of said hammer, said hammer is swung in response to centrifugal forces at increased speed toward the end face of the hammer member.
Claim 9
Dependent Claim
47 words
In a device as stated in claim 1 wherein said drive means includes a spiral spring motor contained within a motor casing; said motor casing being connected with said outer housing for rotation therewith, said motor casing being normally restrained against rotation and being rotatable upon release.
Claim 10
Dependent Claim
26 words
In a device as stated in claim 1 including a normally exposed signal member, and means to retract said signal member upon operation of said alarm.
Claim 11
Dependent Claim
42 words
In a device as stated in claim 1 including a thermal-responsive means carried on the said shell; a trigger means on said base member in normally holding engagement with a hammer member; and means interconnecting said thermal-responsive means and said trigger means.
Claim 12
Dependent Claim
116 words
In a fire detection alarm means the combination of: an outer sound shell means; an inner housing and a base member associated therewith; a sounding pin movably mounted on said inner housing to strike said shell means; drive means within said inner housing; and means within said inner housing, connected with said drive means, and rotatable thereby for repetitively striking one end of said pin and for regulating speed of rotation of said rotatable means; said rotatable means including a hammer member held in a cocked position during movement through a selected angle of rotation and released into an uncocked position whereby in response to centrifugal forces said hammer member is forcibly driven against said pin.
Claim 13
Dependent Claim
116 words
In a fire detection alarm means the combination of: an outer sound shell means; an inner housing and a base member associated therewith; a sounding pin movably mounted on said inner housing to strike said shell means; drive means within said inner housing; and means within said inner housing, connected with said drive means, and rotatable thereby for repetitively striking one end of said pin and for regulating speed of rotation of said rotatable means; said rotatable means including a hammer member held in a cocked position during movement through a selected angle of rotation and released into an uncocked position whereby in response to centrifugal forces said hammer member is forcibly driven against said pin.
Claim 14
Dependent Claim
105 words
In combination with an alarm means having a movable sounding pin and a drive means including a driving axis of rotation, the provision of: a driven member rotatable about said driven axis of rotation; an arcuate wall spaced from the periphery of the path of rotation of said rotatable member; hammer means having a pivotal connection to said rotatable member and in spaced relation to said driven axis; said hammer member having a head portion slidably frictionally engageable with said arcuate wall and swingable relative to said rotatable member for striking said pin when said head portion is out of engagement with said arcuate wall.
Claim 15
Dependent Claim
105 words
In combination with an alarm means having a movable sounding pin and a drive means including a driving axis of rotation, the provision of: a driven member rotatable about said driven axis of rotation; an arcuate wall spaced from the periphery of the path of rotation of said rotatable member; hammer means having a pivotal connection to said rotatable member and in spaced relation to said driven axis; said hammer member having a head portion slidably frictionally engageable with said arcuate wall and swingable relative to said rotatable member for striking said pin when said head portion is out of engagement with said arcuate wall.
Claim 16
Dependent Claim
41 words
In a device as stated in claim 12 wherein said hammer member includes a head portion with a center of mass spaced from said pivotal connection a distance substantially equal to the distance between said pivotal connection and said driven axis.
Claim 17
Dependent Claim
38 words
In a device as stated in claim 12 wherein said arcuate wall terminates in the angular path of rotation about said driven axis approximately 90* before the end of said pin to be struck by said hammer member.
Claim 18
Dependent Claim
26 words
In a device as stated in claim 10 wherein said interconnecting means includes a floating pin; and means for adjusting the longitudinal displacement of said pin.
References Cited (Backward Citations)
US1276807A
Cited
US1463361A
Cited
US1563279A
Cited
US2197412A
Cited
US2246878A
Cited
US2609785A
Cited
US2999477A
Cited
US3148658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-15 | 1974-09-14 | 1975-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-15 | 1978-09-14 | 1979-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-15 | 1982-09-14 | 1983-03-16 | $7700.00 | Window Closed / Lapsed |