US3799236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Venetian blind having a cord lock which is actuated upon full raising of the blind
Assignee: Levolor Corp
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Filing: 1972-11-10
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Granted: 1974-03-26
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Expires: 1992-11-10
Abstract
Abstract As the blind is raised into uppermost position, the top slat of the blind moves an actuator that swings the locking dog of the cord lock into locking position. This locks the blind in its fully raised position.
Inventors
- 👤 V Debs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:46
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/28; E06B9/30; E06B9/32; E06B9/324
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A Venetian blind having a ladder-and-slat assembly suspended beneath a head, the head being provided with a cord lock having a pivoted locking dog that is biased into non-locking position and is swingable into locking position, the blind being raised and lowered by lift cords which pass through the cord lock and hang down for manual manipulation to raise and lower the blind, and the top slat of the blind moving upwardly as the blind is raised into uppermost position wherein the improvement comprises: an actuator for swinging the locking dog of the cord lock into locking position, the actuator extending into the path of upward movement of the top slat of the blind, and the top slat, by its upward movement, shifting the actuator and thereby swinging the locking dog into locking position.
Claim 2
Dependent Claim
134 words
A Venetian blind having a ladder-and-slat assembly suspended beneath a head, the head being provided with a cord lock having a pivoted locking dog that is biased into non-locking position and is swingable into locking position, the blind being raised and lowered by lift cords which pass through the cord lock and hang down for manual manipulation to raise and lower the blind, and the top slat of the blind moving upwardly as the blind is raised into uppermost position wherein the improvement comprises: an actuator for swinging the locking dog of the cord lock into locking position, the actuator extending into the path of upward movement of the top slat of the blind, and the top slat, by its upward movement, shifting the actuator and thereby swinging the locking dog into locking position.
Claim 3
Dependent Claim
52 words
A Venetian blind as in claim 1 wherein the improvement further comprises: means to prevent the lift cords from swinging into effective engagement with the locking dog when the locking dog is in non-locking position and the down-hanging lift-cords are swung in a plane parallel to the general plane of the blind.
Claim 4
Dependent Claim
40 words
A Venetian blind as in claim 1 wherein the improvement further comprises: means to positively withdraw the locking dog from locking position, said means including a member that is shiftable by manipulating the down-hanging lift-cords preparatory to lowering the blind.
Claim 5
Dependent Claim
56 words
A Venetian blind as in claim 3 wherein the improvement further comprises: said shiftable member serves, when the locking dog is in non-locking position, to prevent the lift cords from being swung into effective engagement with the locking dog by movement of the down-hanging lift-cords in a plane parallel to the general plane of the blind.
Claim 6
Dependent Claim
68 words
A Venetian blind as in claim 1 wherein the improvement further comprises: the locking dog has first and second legs which hang down when the dog is in non-locking position, the first leg having a free end which makes locking engagement with the lift cords when the dog is in locking position, and the second leg being connected to the actuator which swings the dog into locking position.
Claim 7
Dependent Claim
84 words
A Venetian blind as in claim 1 wherein the improvement further comprises: the locking dog has first and second legs which hang down when the locking dog is in non-locking position, the first leg having a free end which makes locking engagement with the lift cords when the dog is in locking position, and means to positively withdraw the dog from locking position, said means being connected to the second leg of the dog and being shiftable by pulling down on the down-hanging lift-cords.
Claim 8
Dependent Claim
68 words
A Venetian blind as in claim 1 wherein the improvement further comprises: the actuator has a portion which is vertically above the axis of tilt of the top slat, and it is through engagement of the top slat at its axis of tilt with such portion of the actuator that the top slat, by its upward movement, shifts the actuator annd swings the locking dog into locking position.
Claim 9
Dependent Claim
32 words
A Venetian blind as in claim 1 wherein the improvement further comprises: the actuator includes a finger which inclines downwardly toward the top slat when the locking dog is in non-locking position.
Claim 10
Dependent Claim
29 words
A Venetian blind as in claim 8 wherein the improvement further comprises: the finger has an end which is vertically above the top slat at its axis of tilt.
Claim 11
Dependent Claim
41 words
A Venetian blind as in claim 1 wherein the improvement further comprises: the cord lock is in a forward position in the head of the blind and the actuator extends to a location which is farther back than the cord lock.
Claim 12
Dependent Claim
41 words
A Venetian blind as in claim 1 wherein the improvement further comprises: a member, which moves with the locking dog, extends toward the front of the blind and thence generally upward adjacent to the front of the head of the blind.
Claim 13
Dependent Claim
32 words
A Venetian blind as in claim 11 wherein the improvement further comprises: said member extends generally upward to a level close to that of the top of the head of the blind.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |