US3921695A - Wand operated venetian blind - Google Patents

Wand operated venetian blind Download PDF

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Publication number
US3921695A
US3921695A US510350A US51035074A US3921695A US 3921695 A US3921695 A US 3921695A US 510350 A US510350 A US 510350A US 51035074 A US51035074 A US 51035074A US 3921695 A US3921695 A US 3921695A
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US
United States
Prior art keywords
gear
worm
blind
mesh
point
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US510350A
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English (en)
Inventor
Victor Debs
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Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US510350A priority Critical patent/US3921695A/en
Priority to CA234,778A priority patent/CA1040523A/fr
Priority to GB37548/75A priority patent/GB1509947A/en
Priority to DE7529767U priority patent/DE7529767U/de
Priority to ES441401A priority patent/ES441401A1/es
Application granted granted Critical
Publication of US3921695A publication Critical patent/US3921695A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • E06B9/26—Lamellar or like blinds, e.g. venetian blinds
    • E06B9/28—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable
    • E06B9/30—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable
    • E06B9/32—Operating, guiding, or securing devices therefor
    • E06B9/322—Details of operating devices, e.g. pulleys, brakes, spring drums, drives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/1987—Rotary bodies
    • Y10T74/19874—Mutilated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/19—Gearing
    • Y10T74/19949—Teeth
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20396—Hand operated
    • Y10T74/20474—Rotatable rod, shaft, or post
    • Y10T74/2048—Gear, drum, and cable

Definitions

  • overpull When the point of maximum normal closure has been reached, continued rotation of the wand causes overpull on the ladders; and the overpull can become deleterious in one or more ways.
  • the overpull may jamb the top slat against the head of the blind. Also, it may cause the top slat to flip over or try to, particularly in the case of a narrow slat blind.
  • the blind of US. Pat. 3,799,237 in which the top slat coacts with a cordlock actuator, it is possible for overpull on the ladders to foul the cord look.
  • the gear of the tilter is a sector of less than 360, whereby the gear can run out of mesh with the worm.
  • Applicants construction and arrangement are such that, when maximum normal closure of the blind has been reached, the gear is on the verge of running out of mesh with the wormmeaning that small additional movement of the gear would cause the gear to run out of mesh with the worm.
  • the person closing the blind would normally halt his rotation of the wand. Should he fail to do so, the gear will promptly run out of mesh with the worm to suspend tilting action of the tilter before deleterious overpull on the ladders has taken place. Continued rotation of the wand will then be ineffective, and will be harmless accordingly.
  • Venetian blinds are arranged to be closed by tilting the slats in either direction. If the blind be one which is arranged for closure in either direction the tilter will provide, as regards each direction, for the gear running out of mesh with the worm unless rotation of the wand is halted promptly upon the maximum normal closure of the blind being reached. If the blind be one which is arranged for closure in one direction only, the tilter need provide, as regards that direc- 2 tion only, for the gear running out of mesh with the worm.
  • the slats of the blind are tilted to closed position by pulling up either the front or the rear sidepieces of the ladders.
  • the pull on the sidepieces means that there is back pull by the sidepieces themselves, and this back pull is fairly strong as the blind approaches maximum normal closure.
  • the back pull is transmitted to the tilter and biases the gear retrogressively.
  • the end tooth of the gear having run out of mesh with the worm, and the thread of the worm having slipped past the end tooth, the retrogressive bias of the gear causes the gear to retrogress a littlethe retrogression being arrested by the end tooth of the gear sector engaging the worm convolution somewhat back of the point at which the tooth ran out of mesh with the worm.
  • the point at which the gear is to run out of mesh with the worm is placed somewhat beyond the point at which maximum normal closure of the blind is reached, whereby all or some of the retrogression of the gear will have taken place before the gear has retrogressed to the point at which maximum normal closure of the blind was reached.
  • FIG. 1 is a largely diagrammatic front elevation of a Venetian blind embodying the invention, the front of the blind being the face that is toward the room.
  • FIG. 2 is essentially a front elevation of a fragment of the head of the blind, on a larger scale, a portion of the front wall of the head channel being broken out to reveal the tilter.
  • FIG. 3 is essentially a section of the head, taken generally on the line 3-3 of FIG. 2.
  • a fragment of the ladder-and-slat assembly is indicated including a fragment of a lift cord.
  • the blind is fully open, the slats being horizontal, i.e., untilted.
  • FIG. 4 is the same as FIG. 3 but with the blind and tilter at the point of maximum normal closure with the slats tilted forwardly, i.e., tilted with the front edges of the slats depressed.
  • FIG. 5 is the same as FIG. 3 but with the blind and tilter at the point of maximum normal closure with the slats tilted rearwardly, i.e., tilted with the rear edges of the slats depressed.
  • the blind may be a wand operated Venetian blind of suitable known construction and arrangement, for example, the construction and arrangement disclosed in the US. patent of Lorentzen et al. US. Pat. No. 3,425,479 issued Feb. 4, I969.
  • the known construction and arrangement that is disclosed in the present application is the construction and ar rangement of the blind of that patent.
  • a ladder-and-slat assembly that is designated as a whole by is positioned beneath a head which is designated as a whole by 16.
  • the ladder-and-slat assembly includes a series of slats 17 that are supported and an ticulated together in known manner by two or more ladders 18.
  • Each ladder 18 has a front sidepiece 18a and a rear sidepiece 18b, the two sidepieces being in-' terconnected by vertically-spaced crosspieces or rungs 18c on which the slats 17 rest.
  • the ladder shown is of the string type, the sidepieces 18a and 18b. being braided cords and each crosspiece 18c being a plurality of filaments which may be braided or twisted into one or more strands.
  • the had 16 consists primarily of a sheet-steel channel 20 and the mechanism that is contained therein.
  • the channel 20 has a front wall 200, a rear wall 20b and a bottom wall 20c. Along the upper edges of the front and rear walls 20a and 20b there are longitudinallyextending flanges 20d which are folded inwardly and downwardly.
  • the bottom wall 200 is pierced in known manner (not shown) for passage into the channel 20 of each sidepiece 18a and 18b of the ladders and each lift cord 22 (one shown).
  • the Venetian blind designated as a whole by 14 in FIG. 1, is shown diagrammatically as being mounted in conventional manner within a window opening.
  • the head 16 of the blind is mounted on conventional installation brackets 5, one attached to each of the jambs 6 of the window opening.
  • the soffit of the window opening is indicated at 7 and the sill at 8. i
  • the tilter which is designated as a whole by 40, includes a housing that is mounted in the head channel 20. Journalled within the housing there is a double thread worm 41 and a gear 42.
  • the worm is molded in one piece with a shaft 45 that projects as shown through an opening 20g in the head channel, which opening is spread over an area that includes the juncture of the front wall 20a and the bottom wall 200.
  • the wand 38 and its connection to shaft 45 may be as in U.S. Pat. No. 3,425,479. Except for the gear 42, the coordination of the gear 42 with the worm 41 and the coordination of the gear 42 with the ladders 18, the tilter 40 and its mounting in the head channel 20 are the same as in U.S. Pat. No. 3,425,479.
  • FIG. 3 shows the relationship between the worm 41 and the gear 42 when the gear is in mid position, i.e., half-way between its limit of rotation clockwise and its limit of rotation counter-clockwise. As a matter of mechanical convenience in the particular tilter, a radius of the gear 42 does not intersect the worm half-way between the ends of the worm 41 but intersects the worm nearer the top end of the worm.
  • the gear 42 is a sector of less than 360 degrees, the particular gear shown being a sector which is eight-thin teenths of 360.
  • the gear is driven by the worm; and rotation of the gear in either direction is limited by the end tooth of the gear section being brought to the worm and then pushed as far as the worm can push it.
  • FIG. 4 shows the relationship between the worm 41 and the gear 42 when the gear is on the verge of running out of mesh with the worm by clockwise rotation.
  • An increment of angular movement of the gear-42 does not effect a particular increment of tilting movement of the slats l7 regardless of the means by which the movement of the gear is transmitted to the slats or. regardless of the width of the slats. What an increment of angular movement of the gear 42 does do is to effect a like increment of angular movement of the tilt rod 24 and the drums that are mounted thereon and to which the ladder sidepieces 18a and 18b are attached. How much the sidepieces of the ladders are raised or lowered by a given increment of angular movement of the drums will be governed by the radius of the drums.
  • the gear sector 42 is provided with three teeth the end tooth of which is t Rotating the wand in the direction of the arrow in FIG. 4, the end tooth. I is brought to the worm 41 and is onthe verge of running out of mesh with the worm when the blind has been brought to its maximum normal closure by tilting the slats forthe slats are untilted as shown in FIG. 3 of the present wardly; this is shown in FIG. 4. Rotating the wand in the direction of the arrow in FIG. 5, the end tooth Z is brought to the worm 41 and is on the verge of running out of mesh with the worm when the blind has been brought to its maximum normal closure by tilting the slats rearwardly; this is shown in FIG. 5.
  • each end tooth t and I is positioned to keep the gear in mesh with the worm 41 until the angle by which the gear has passed the point at which maximum normal closure was reached is at least as great as the maximum angle of retrogression of the gear when the gear runs out of mesh with the worm. This insures that there will be no retrogression of the blind from maximum normal closure when the gear runs out of mesh with the worm.
  • the blind is automatically pro tected against the possibility of deleterious overpull on the ladders by continued rotation of the wand after maximum normal closure has been reached. It will also be seen that retrogession of the blind from maximum normal closure is limited and, preferably, obviated.
  • a Venetian blind that is closed in either direction, i.e., by tilting the slats in either direction from their horizontal position, the slats being tilted by motion transmitted to them from a gear, the gear being rotated by a worm, and the worm being rotated by a manually rotated wand that is connected to the worm
  • the improvement comprises:
  • the gear is a sector of less than 360 and is on the verge of rotating out of mesh with the worm upon the blind reaching its closed position in either direction, the gear retrogresses a little upon rotating out of mesh with the worm,
  • the point'at which the gear rotates out of mesh with the worm is a little beyond the point at which the blind reaches its closed position and at least as far beyond such point as the retrogression of the gear upon rotating out of mesh with the worm, whereby the retrogression of the gear takes place entirely beyond the point at which the blind reaches its closed position and, thereby, the blind is protected against retrogressive opening movement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Blinds (AREA)
  • Ladders (AREA)
  • Pyrane Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Nitrogen Condensed Heterocyclic Rings (AREA)
US510350A 1974-09-30 1974-09-30 Wand operated venetian blind Expired - Lifetime US3921695A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US510350A US3921695A (en) 1974-09-30 1974-09-30 Wand operated venetian blind
CA234,778A CA1040523A (fr) 1974-09-30 1975-09-04 Store venitien a tige de manoeuvre
GB37548/75A GB1509947A (en) 1974-09-30 1975-09-12 Wand operated venetian blind
DE7529767U DE7529767U (de) 1974-09-30 1975-09-19 Stabbetaetigte jalousie
ES441401A ES441401A1 (es) 1974-09-30 1975-09-30 Mejoras introducidas en una persiana de tiro.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US510350A US3921695A (en) 1974-09-30 1974-09-30 Wand operated venetian blind

Publications (1)

Publication Number Publication Date
US3921695A true US3921695A (en) 1975-11-25

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ID=24030389

Family Applications (1)

Application Number Title Priority Date Filing Date
US510350A Expired - Lifetime US3921695A (en) 1974-09-30 1974-09-30 Wand operated venetian blind

Country Status (5)

Country Link
US (1) US3921695A (fr)
CA (1) CA1040523A (fr)
DE (1) DE7529767U (fr)
ES (1) ES441401A1 (fr)
GB (1) GB1509947A (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214622A (en) * 1978-06-30 1980-07-29 Levolor Lorentzen, Inc. Vertical blind
US4262728A (en) * 1978-06-30 1981-04-21 Levolor Lorentzen, Inc. Vertical blind
US4406319A (en) * 1980-11-17 1983-09-27 Beatrice Foods Co. Venetian blind drive control
US4522245A (en) * 1983-01-04 1985-06-11 Hunter Douglas Inc. Housing for a venetian blind tilter mechanism
US4621672A (en) * 1985-01-18 1986-11-11 Hsu Pei Shun Mechanism for window blind
US4676292A (en) * 1985-04-11 1987-06-30 Beatrice Companies, Inc. Tilter apparatus for a slatted window covering
US4697629A (en) * 1984-09-27 1987-10-06 Hunter Douglas Inc. Tilting device for the ladder means of a venetian blind
US4759398A (en) * 1984-06-11 1988-07-26 Renee William C Operator for venetian blinds combination operator and venetian blind, and method of operating venetian blinds
US4955248A (en) * 1988-03-01 1990-09-11 Ab Perma System Angular gear for venetian blinds
US5238043A (en) * 1992-01-31 1993-08-24 Better Mousetraps, Inc. Apparatus for accurate adjustment of the slats in a venetian blind
US5341865A (en) * 1992-02-07 1994-08-30 Hunter Douglas Inc. Tilter mechanisms for a venetian blind
US6308764B1 (en) * 2000-10-05 2001-10-30 Industrial Technology Research Institute Modulating mechanism of venetian blind
US6325133B1 (en) * 2000-11-06 2001-12-04 Industrial Technology Research Institute Modulating mechanism of venetian blind
US20040231807A1 (en) * 2003-05-21 2004-11-25 Springs Window Fashions Lp Venetian blind ladder drum and method of assembling venetian blind
US9376859B1 (en) * 2012-08-16 2016-06-28 Newell Window Furnishings, Inc. Tilter assembly for a window covering
US20170241198A1 (en) * 2016-02-19 2017-08-24 Hunter Douglas Inc. Dual cord operating system for an architectural covering
US10550635B2 (en) 2017-08-09 2020-02-04 Whole Space Industries Ltd Window covering control apparatus
US10676988B2 (en) 2017-09-20 2020-06-09 Whole Space Industries Ltd. Window covering control apparatus
US10975618B2 (en) * 2017-07-26 2021-04-13 Whole Space Industries Ltd Slat tilt mechanism for window coverings
USD935221S1 (en) 2019-06-26 2021-11-09 Whole Space Industries Ltd Bottom rail for a window covering

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2276237C (fr) * 1998-06-22 2007-05-01 Hunter Douglas Inc. Systeme de controle et de suspension pour parement de baie architecturale

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580479A (en) * 1949-10-24 1952-01-01 Max J Stogran Cord equalizing mechanism for venetian blinds
US2709488A (en) * 1952-09-12 1955-05-31 Lorentzen Hardware Mfg Corp One-way-tilt venetian blind construction
US3425479A (en) * 1966-08-29 1969-02-04 Levolor Lorentzen Inc Venetian blind construction suitable for low heads and narrow slats

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580479A (en) * 1949-10-24 1952-01-01 Max J Stogran Cord equalizing mechanism for venetian blinds
US2709488A (en) * 1952-09-12 1955-05-31 Lorentzen Hardware Mfg Corp One-way-tilt venetian blind construction
US3425479A (en) * 1966-08-29 1969-02-04 Levolor Lorentzen Inc Venetian blind construction suitable for low heads and narrow slats

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4214622A (en) * 1978-06-30 1980-07-29 Levolor Lorentzen, Inc. Vertical blind
US4262728A (en) * 1978-06-30 1981-04-21 Levolor Lorentzen, Inc. Vertical blind
US4406319A (en) * 1980-11-17 1983-09-27 Beatrice Foods Co. Venetian blind drive control
US4522245A (en) * 1983-01-04 1985-06-11 Hunter Douglas Inc. Housing for a venetian blind tilter mechanism
US4759398A (en) * 1984-06-11 1988-07-26 Renee William C Operator for venetian blinds combination operator and venetian blind, and method of operating venetian blinds
US4697629A (en) * 1984-09-27 1987-10-06 Hunter Douglas Inc. Tilting device for the ladder means of a venetian blind
US4621672A (en) * 1985-01-18 1986-11-11 Hsu Pei Shun Mechanism for window blind
US4676292A (en) * 1985-04-11 1987-06-30 Beatrice Companies, Inc. Tilter apparatus for a slatted window covering
US4955248A (en) * 1988-03-01 1990-09-11 Ab Perma System Angular gear for venetian blinds
US5238043A (en) * 1992-01-31 1993-08-24 Better Mousetraps, Inc. Apparatus for accurate adjustment of the slats in a venetian blind
US5341865A (en) * 1992-02-07 1994-08-30 Hunter Douglas Inc. Tilter mechanisms for a venetian blind
US6308764B1 (en) * 2000-10-05 2001-10-30 Industrial Technology Research Institute Modulating mechanism of venetian blind
US6325133B1 (en) * 2000-11-06 2001-12-04 Industrial Technology Research Institute Modulating mechanism of venetian blind
US20040231807A1 (en) * 2003-05-21 2004-11-25 Springs Window Fashions Lp Venetian blind ladder drum and method of assembling venetian blind
US6976522B2 (en) 2003-05-21 2005-12-20 Springs Window Fashions Lp Venetian blind ladder drum and method of assembling venetian blind
US9376859B1 (en) * 2012-08-16 2016-06-28 Newell Window Furnishings, Inc. Tilter assembly for a window covering
US20170241198A1 (en) * 2016-02-19 2017-08-24 Hunter Douglas Inc. Dual cord operating system for an architectural covering
US10655385B2 (en) * 2016-02-19 2020-05-19 Hunter Douglas Inc. Dual cord operating system for an architectural covering
US11021908B2 (en) 2016-02-19 2021-06-01 Hunter Douglas Inc. Dual cord operating system for an architectural covering
US10975618B2 (en) * 2017-07-26 2021-04-13 Whole Space Industries Ltd Slat tilt mechanism for window coverings
US20210140230A1 (en) * 2017-07-26 2021-05-13 Whole Space Industries Ltd Slat tilt mechanism for window coverings
US11939813B2 (en) * 2017-07-26 2024-03-26 Whole Space Industries Ltd Slat tilt mechanism for window coverings
US10550635B2 (en) 2017-08-09 2020-02-04 Whole Space Industries Ltd Window covering control apparatus
US10676988B2 (en) 2017-09-20 2020-06-09 Whole Space Industries Ltd. Window covering control apparatus
USD935221S1 (en) 2019-06-26 2021-11-09 Whole Space Industries Ltd Bottom rail for a window covering

Also Published As

Publication number Publication date
CA1040523A (fr) 1978-10-17
ES441401A1 (es) 1977-03-16
GB1509947A (en) 1978-05-10
DE7529767U (de) 1976-04-08

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