US3727665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blind having lift cords and a cord lock
Assignee: Levolor Corp
•
Filing: 1971-05-05
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Granted: 1973-04-17
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Expires: 1991-05-05
Abstract
Abstract A blind has lift cords which pass through a cord lock and hang down to be pulled downwardly and eased upwardly to raise and lower the blind. The down-hanging lift-cords are guided by a pendant cord-guide which is attached to and carried by an actuating cord that is connected to the locking dog of the cord lock. When the actuating cord is pulled it moves the locking dog into locking engagement with the lift cords, causing the cord lock to lock the cords.
Inventors
- 👤 V Debs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:50
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/24; E06B9/26; E06B9/28; E06B9/30; E06B9/32; E06B9/324
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
121 words
A blind in which (a) lift cords pass through a cord lock and, when the blind has been installed, hang down to be pulled downwardly and be eased upwardly to raise and lower the blind, (b) the cord lock has locking means that is biased away from the lift cords but is movable into locking engagement with the lift cords, and (c) an actuating cord is connected to the locking means and, upon being pulled, moves the locking means into locking engagement with the lift cords -wherein the improvement comprises: pendant cord-guide means for the lift cords, said pendant cordguide means being attached to and carried by the actuating cord that is connected to the locking means of the cord lock.
Claim 2
Dependent Claim
121 words
A blind in which (a) lift cords pass through a cord lock and, when the blind has been installed, hang down to be pulled downwardly and be eased upwardly to raise and lower the blind, (b) the cord lock has locking means that is biased away from the lift cords but is movable into locking engagement with the lift cords, and (c) an actuating cord is connected to the locking means and, upon being pulled, moves the locking means into locking engagement with the lift cords -wherein the improvement comprises: pendant cord-guide means for the lift cords, said pendant cordguide means being attached to and carried by the actuating cord that is connected to the locking means of the cord lock.
Claim 3
Dependent Claim
26 words
A blind as in claim 1 wherein the improvement further comprises: the pendant cord-guide means has spaced lift-cord passages through which the down-hanging lift-cords pass vertically.
Claim 4
Dependent Claim
28 words
A blind as in claim 2 wherein the improvement further comprises: one or more lift cords pass through each of the lift-cord passages of the pendant cord-guide means.
Claim 5
Dependent Claim
49 words
A blind as in claim 1 wherein the improvement further comprises: the pendant cord-guide means has spaced lift-cord passages through which the down-hanging lift-cords pass vertically, and the attachment of the pendant cord-guide means to the actuating cord is at a location that is between said spaced lift-cord passages.
Claim 6
Dependent Claim
36 words
A blind as in claim 2 wherein the improvement further comprises: the lift-cord passages of the pendant cord-guide means extend vertically for a distance which is long as compared to the thickness of the lift cords.
Claim 7
Dependent Claim
24 words
A blind as in claim 3 wherein the improvement further comprises: the lift-cord passages afford unfettered movement of the lift cords through the passages.
Claim 8
Dependent Claim
57 words
A blind as in claim 1 wherein the improvement further comprises: the pendant cord-guide means is a unitary cord-guide having its center of gravity on its central vertical-axis, and the attachment of the unitary cord-guide to the actuating cord is at a location which is approximately on such vertical axis and substantially above the center of gravity.
Claim 9
Dependent Claim
44 words
A blind as in claim 1 wherein the improvement further comprises: the pendant cord-guide means is a pendant block, and the central vertical-axis of the block is aligned approximately with the actuating cord that is connected to the locking means of the cord lock.
Claim 10
Dependent Claim
38 words
A blind as in claim 8 wherein the improvement further comprises: the pendant block has lift-cord passages which are spaced in opposite directions from the central vertical-axis of the block, the down-hanging lift-cords passing vertically through such passages.
Claim 11
Dependent Claim
27 words
A blind as in claim 9 wherein the improvement further comprises: one or more lift cords pass through each of the lift-cord passages of the pendant block.
Claim 12
Dependent Claim
35 words
A blind as in claim 9 wherein the improvement further comprises: the lift-cord passages of the pendant block extend vertically for a distance which is long as compared to the thickness of the lift cords.
Claim 13
Dependent Claim
65 words
A blind as in claim 9 wherein the improvement further comprises: one or more lift cords pass through each of the lift-cord passages of the pendant block, the lift-cord passages of the pendant block extend vertically for a distance which is long as compared to the thickness of the lift cords, and the lift-cord passages afford unfettered movement of the lift cords through the passages.
Claim 14
Dependent Claim
104 words
A blind as in claim 1 in which (d) the cord lock has a cord guide that guides the lift cords through a 90* bend, and (e) the locking means of the cord lock is a pivoted locking dog which, when it is in locking engagement with the lift cords, clamps the lift cords aGainst said cord guide of the cord lock -wherein the improvement further comprises: a spring which biases the locking dog away from the lift cords, the spring having sufficient strength to counteract the combined weight of the pendant cord-guide and the actuating cord to which the pendant cord-guide is attached.
Claim 15
Dependent Claim
31 words
A blind as in claim 13 wherein the improvement further comprises: the spring which biases the locking dog away from the lift cords is a readily detachable and replaceable coil spring.
Claim 16
Dependent Claim
56 words
A blind as in claim 13 wherein the improvement further comprises: one end of the actuating cord is connected to the pendant cord-guide and the other end is connected to the locking dog, and the actuating cord, adjacent to the locking-dog-connected end thereof, is formed into a bight which embraces the pivot of the locking dog.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |