US3636683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter with latch assembly
Assignee: Burgess Manning Inc
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Filing: 1969-12-30
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Granted: 1972-01-25
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Expires: 1989-12-30
Abstract
Abstract A filter assembly includes a latch which engages a detent located at a substantial height above the surface to which the latch is secured. The overall reach of the latch mechanism is variable as a consequence of a double pivot. A panel, frame, or other movable body, which is secured by means of this latch assembly, is continuously compressed against its seat due to the positive compression of the latch mechanism against the detent. The particular arrangement of the pivots of the latch mechanism provides an over-the-center action which not only locks the latch, but moreover causes the compressing action to be increased should forces be exerted to withdraw the movable, secured body prior to unlocking of the latch. The continuously exerted compression is utilized to continuously seal filtering elements against lateral leakage.
Inventors
- 👤 Roy B Francis
- 👤 Billy D Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:59
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; F; F24; F24F; F24F13/00; F24F13/28; Y; Y10; Y10S; Y10S292/00; Y10S292/49; Y10T; Y10T292/00; Y10T292/08; Y10T292/0886; Y10T292/0887; Y10T292/089
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
351 words
A filter assembly having a fixed structural frame with a filter-receiving opening therein, said filter-receiving opening having filter-engaging seating means associated therewith for receiving a filter, said opening including sidewalls positioned closely adjacent said filter, said filter assembly including a filter pad sized to substantially span said opening and seated on said seating means; said filter assembly including a filter pad retaining frame, said filter assembly including lock means comprising two separable elements, one of said elements being detent means fixed to one of said sidewalls at a point substantially above said retaining frame, the other of said elements being fixed to said retaining frame and comprising jointed, pivotable catch means for engaging said detent means; said catch means being pivotable through an arc from a plane which forms an obtuse angle with said filter pad, said catch means reaching said detent means when said retaining frame is seated on said seating means, said catch means including pivotable arm and link means for engaging said detent means in the sidewall where said catch means reaches said sidewall, the arm and link means comprising a link pivotally secured at the first end thereof to said pad-retaining frame and a resilient latch arm having one end thereof pivotally secured to the second end of said link, the other end of said latch arm being engageable with said detent means, the distance between the latch arm pivot at the second end of said link and said detent means when said retaining frame is at rest in position on said seat being slightly shorter than the combined length of said latch arm and distance between the two points at the ends of said link, whereby seating the filter pad and the retaining frame and engaging said detent means by said latch arm and forcing said link in rotation about the pivot point at the first end thereof through a line between the pivot point at the second end of said link and said detent means provides an overthe-center snap action; and biasing means for urging the end of said latch arm against said detent means.
Claim 2
Dependent Claim
351 words
A filter assembly having a fixed structural frame with a filter-receiving opening therein, said filter-receiving opening having filter-engaging seating means associated therewith for receiving a filter, said opening including sidewalls positioned closely adjacent said filter, said filter assembly including a filter pad sized to substantially span said opening and seated on said seating means; said filter assembly including a filter pad retaining frame, said filter assembly including lock means comprising two separable elements, one of said elements being detent means fixed to one of said sidewalls at a point substantially above said retaining frame, the other of said elements being fixed to said retaining frame and comprising jointed, pivotable catch means for engaging said detent means; said catch means being pivotable through an arc from a plane which forms an obtuse angle with said filter pad, said catch means reaching said detent means when said retaining frame is seated on said seating means, said catch means including pivotable arm and link means for engaging said detent means in the sidewall where said catch means reaches said sidewall, the arm and link means comprising a link pivotally secured at the first end thereof to said pad-retaining frame and a resilient latch arm having one end thereof pivotally secured to the second end of said link, the other end of said latch arm being engageable with said detent means, the distance between the latch arm pivot at the second end of said link and said detent means when said retaining frame is at rest in position on said seat being slightly shorter than the combined length of said latch arm and distance between the two points at the ends of said link, whereby seating the filter pad and the retaining frame and engaging said detent means by said latch arm and forcing said link in rotation about the pivot point at the first end thereof through a line between the pivot point at the second end of said link and said detent means provides an overthe-center snap action; and biasing means for urging the end of said latch arm against said detent means.
Claim 3
Dependent Claim
214 words
In an air filter including a fixed structural frame and a filter pad seated in an opening therein, improved means for holding the pad in position therein comprising a retaining frame engaging the pad and latch means for holding said retaining frame against said pad; said latch means comprising a channel-shaped link pivotally supported at one end upon one side of said retaining frame for rotation about the pivot axis at one end of said link, the other end of said link comprising a handle portion for manipulating the same, a curved resiliently flexible latch aRm pivotally connected with said link intermediate said one end and said handle portion thereof, and detent means located on the structural frame for engagement by the free end of said latch arm, said detent means being spaced away from said retaining frame in said structural frame, the length of said curved latch arm being less than the combined length thereof and the distance between the two pivot connections of said link and being of sufficient length to cause said arm to bend to increased curvature when said link is rotated toward said detent means to and past dead center position to bias said latch arm in axial compression and impose continuing resilient latching pressure against said detent means.
Claim 4
Dependent Claim
214 words
In an air filter including a fixed structural frame and a filter pad seated in an opening therein, improved means for holding the pad in position therein comprising a retaining frame engaging the pad and latch means for holding said retaining frame against said pad; said latch means comprising a channel-shaped link pivotally supported at one end upon one side of said retaining frame for rotation about the pivot axis at one end of said link, the other end of said link comprising a handle portion for manipulating the same, a curved resiliently flexible latch aRm pivotally connected with said link intermediate said one end and said handle portion thereof, and detent means located on the structural frame for engagement by the free end of said latch arm, said detent means being spaced away from said retaining frame in said structural frame, the length of said curved latch arm being less than the combined length thereof and the distance between the two pivot connections of said link and being of sufficient length to cause said arm to bend to increased curvature when said link is rotated toward said detent means to and past dead center position to bias said latch arm in axial compression and impose continuing resilient latching pressure against said detent means.
Claim 5
Dependent Claim
40 words
Structure in accordance with claim 2 wherein the link of the latch means is pivotally supported upon the retaining frame by means of a resilient arm which may flex as said link is moved to and past dead center position.
Claim 6
Dependent Claim
35 words
Structure in accordance with claim 2 wherein the web of the channel-shaped link is provided with a transverse slot for insertion of a tool to apply rotational force to the link to disengage the latch.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |