CA1160945A - Tilter mechanism - Google Patents
Tilter mechanismInfo
- Publication number
- CA1160945A CA1160945A CA000344694A CA344694A CA1160945A CA 1160945 A CA1160945 A CA 1160945A CA 000344694 A CA000344694 A CA 000344694A CA 344694 A CA344694 A CA 344694A CA 1160945 A CA1160945 A CA 1160945A
- Authority
- CA
- Canada
- Prior art keywords
- wormwheel
- tilt rod
- rotation control
- key
- extension
- 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
Links
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
- E06B9/303—Lamellar or like blinds, e.g. venetian blinds with horizontal lamellae, e.g. non-liftable liftable with ladder-tape
- E06B9/307—Details of tilting bars and their operation
-
- 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
- E06B2009/285—Means for actuating a rod (being tilt rod or lift rod)
Abstract
ABSTRACT OF THE DISCLOSURE
A tilter mechanism for the slats of a venetian blind includes a mounting bracket for mounting the mechanism securely to a venetian blind headrail. A housing is connected to the bracket and an externally operable worm is rotatably mounted in said housing. A wormwheel is also mounted for rotation about an axis in the housing in operative engagement with the worm. The mechanism also includes an elongated tilt rod. An axial extension is provided on each axial end of the wormwheel, a recess being formed in each extension. One end of the tilt rod is received in a selected one of the recesses with the tilt rod thus extending away from the corresponding extension of the wormwheel along the axis of rotation thereof. A V-shaped spring clip having openings in each arm of the V is provided with the tilt rod extending through these openings to thus mount the spring clip securely on the tile rod. One end of the V has at its free end a bent down portion including an orifice. A rotation control disc has a central opening with at least one notch extending radially out-wardly from this central opening together with two radially out-wardly extending abutment surfaces located adjacent the outer periphery of the rotation control disc. The rotation control disc is mounted on the other one of the wormwheel extensions. Stop means are located on the bracket which are engageable by the abutment surfaces on the rotation control disc to restrict the range of rotation of same. A radially outwardly extending key is provided on each axial extension of the wormwheel. One of these keys is engaged in the orifice provided in the bent down end portion of the V-shaped clip. The other such key is engaged by one of the notches on the rotation control disc to define a particular rotational position of same.
A tilter mechanism for the slats of a venetian blind includes a mounting bracket for mounting the mechanism securely to a venetian blind headrail. A housing is connected to the bracket and an externally operable worm is rotatably mounted in said housing. A wormwheel is also mounted for rotation about an axis in the housing in operative engagement with the worm. The mechanism also includes an elongated tilt rod. An axial extension is provided on each axial end of the wormwheel, a recess being formed in each extension. One end of the tilt rod is received in a selected one of the recesses with the tilt rod thus extending away from the corresponding extension of the wormwheel along the axis of rotation thereof. A V-shaped spring clip having openings in each arm of the V is provided with the tilt rod extending through these openings to thus mount the spring clip securely on the tile rod. One end of the V has at its free end a bent down portion including an orifice. A rotation control disc has a central opening with at least one notch extending radially out-wardly from this central opening together with two radially out-wardly extending abutment surfaces located adjacent the outer periphery of the rotation control disc. The rotation control disc is mounted on the other one of the wormwheel extensions. Stop means are located on the bracket which are engageable by the abutment surfaces on the rotation control disc to restrict the range of rotation of same. A radially outwardly extending key is provided on each axial extension of the wormwheel. One of these keys is engaged in the orifice provided in the bent down end portion of the V-shaped clip. The other such key is engaged by one of the notches on the rotation control disc to define a particular rotational position of same.
Description
~L6(~
DESCRIPTION
"TILTER MECHANISM"
B~CKGROU~D OF THE INVENTION
The present invention relates to a tilter mechanism for the slats of a venetian blind.
Many forms of such tilter mechanism have been proposed before and these usually con~ist of a bracket which is mountable in the venetian blind headrail, the bracket carrying a housing in which are mounted a worm which can be rotated from the exterior, and a wormwheel which is operatively associated with the worm. A tilt rod which passes through one or more tilt rolls carryin~ the ladder means of the venetian blind is engaged in the wormwheel. The tilt rod is usually of non-circular, e.gO hexagonal or square cro3s-section, - and this engages in a correspondingly shaped opening ln the wormwheel. Known tilter mechanisms are relatively bulky, complex and expensive to manufacture.
In many instances, it is desirable that the venetian blind slats should only be rotatable by a ; ~ re~tricted amount to give a pleasing appearance to the exterior of a building which has a large number of such-venetian blinds therein. Certain proposals have been made for restricting the rotation of the blind but none ..
.
of these is particularly satisfactory and many of them are rather expensive to manufacture.
It is now proposed, according to the present invention, to provide a tilter mechanism for the slats of a venetian blind, said mechanism comprising a housing, means for mounting said housing on a venetian blind headrail, an externally operable worm rotatably mounted on said housing, a wormwheel rotatably mounted on said housing in operative engagement with said worm, an axial extension at each axial end of said wormwheel, a recess 10 in each of said extensions adapted to receive the end of a tilt rod such that the tilt rod can be inserted into either one of the recesses in said extensions and thus extend either to the left or to the right of said wormwheel, engaging means provided on each of said extensions, each of said engaging means being 15 engageable either by a locking device to hold said tilt rod in place or by a rotation control member mountable on the corresponding extension.
Such a structure can be manufactured relatively simply and the same tilter mechanism can be used whether or not 20 one is intending to have the mechanism at one end of the blind or the other. In other words the tilt rod can extend either from the left side or from the right side of the tilter mechanism.
~' , -"~
~ .., . .~., , . ~ .. . . . .. .
~609~5 It is also proposed to provide a rotation control member including two abutmentR, said control member.
being mountable on the other of said ex~ensions and for stop means to be provided on said bracket engage~ble by said abutments on said rotation control member to restrict rotation thereof., the engageable means on each of said extensions being engageable either by a locking device to hold said tilt rod in place or by said rotation control member, to define a particular rotational p~ition of said control member on said other extensionO
The rotation control member advantageously comprises at least one disc which ha~ a central opening, and at least one notch extending radially outwardly.
from the central opening,and two radially outwardly extending abutment surfaces adjacent the outer periphery of said at least one disc, these surfaces forming the abutments mentioned above~ The engaging means formed on the extension~ of the wormwheel can then comprise a : radially outwardly extending key on each of the axial extensions, the key being engageable in the notch or . notches of the disc, Preferably the disc has a plurality of notches which are equiangularly spaced from one another on the : disc, whereby the rotational position of the diw can be cho~en to give a particular rotational movement possibility for the tilt rodO
~6~ 5 The locking device which may be provided~ can be a spring which can be snap-fitted over the keyO For example, the locking device can be in the form of a spring clip which i8 mounta~le on the tilt rod and haY an oriice adjacent one end which is engageable over the keyO
- A particular advantageous arrangement is one in which each key has an inclined ramp surface at.the end remote from the wormwheel, the spring clip having an upturned end portion for sliding up the ramp surface, whereby the orifice can snap over the end of the key which is nearer to the wormwheelO The spring clip may, for example, comprise a V-~haped member which ha~ openings in each arm of the V, whereby the tilt rod can be pa~sed through the openings to mount the ~pring clip on the tilt rod, .one arm of the V having, at its free end, a bent-down end portion which includes the orifice.
It is also contemplated, according to the present invention, to provide a rotation control member for controlling the rotation of a venetian blind tilt rod, said rotation control member comprising at least one disc having a central opening, a plurality of equiangularly spaced notches extending radially outwardly from said central : opening, two radially outwardly extending abutment surfaces adjacent th,e outer periphery of said at lea~t one di~c, said member being mountable upon the wormwheel of a venetian blind tilter with one of the notche~ engaging a 9~s key on the wormwheel and the abutment surfaces being engageable with stops on the mountIng bracket of the tilter to control rotation of the tilt rod.
In order that the invention may more readily be understood, the following description i~ given, merely by way of example, reference being made to the accompanying drawings, in which:-Figure 1 is a section through a venetian blindheadrail with one embodiment of tilter mechani.sm according to the invention mounted therein, Figure 2 is a front elevation of the tilter mechanism of Figure 1, Figure 3 is a view similar to Figure 1 showing a second embodiment of tilter mechanism in the headrail, Figure 4 is an end view of the tilter of Figure 3 showing the rotation control member, and Figure 5 i8 a perspective view of the spring : clip locking device of the mechanisms of Figures 1 to 4, Figure 6 is a view similar to Figure 4, showing an alternative rotation control member, and Figure 7 i9 an exploded perspective view of the rotation control member of Figure 6.
The tilter mechanism illustrated in Figures 1 and 2 is shown as mounted in a headrail 10 having a front wall ll, a rear wall 12 and a lower web 13, The front and rear walls 11 and 12 have inturned rim~ 14 and 15 09 ~5 respectively, as is conventional, The tilter mechani~m is indicated by the general reference numeral 16 and compri~es a bracket 17 on which is mounted a housing 18, the bracket having lugs 19 which engage under the rim 15 while the housing 18 has a portion 20 engaging under the rim 140 The front bottom portion 21 of the bracket prQjects through an opening 22 formed in the headrailO
It wi l be noted that the lower wall 23 of the bracket 17 is provided with two turned up stop lugs 24 and 25 which may be turned up for a reason to be explained later, with reference to Figures 3 to 7O
Mounted for rotati.on within the housing 18 i~ a worm 30 which may be driven by its ~haft 31 connected to a conventional wand (not shown). A wormwheel 32 is rotatable about an axi~ perpendicular to the axi~ of the shaft 31 and is in operative engagement with the worm 30 so that rotation of the worm will cau~e rotation of the wormwheel, in a conventional manner~
Extendlng axially from each end of the wormwheel 32 are extension~ 33 and 34 respectively, the~e being provided with internal blind recesses 35 and 36 and are each ~ provided al~o with a radially outwardly extending key or ;~ projection 37,38~ It will be noted that each of the projections 37,38 includes, at the end remote from the wormwheel, an inclined ramp upper surface 39,400 9L~
Engaged in the hexagonal blind recess 36, is a hexagonal tilt rod 60 and this is held in place by a spring clip 61 which is shown in greater detail i~.
Figure 50 The spring clip is of a generally V-~haped.
-construction having two arm~ 62 and 63 provided with square cross-section holes 64 and 65~ The arm 63 has~
at its free end, a bent-down end portion ~6 which is provided with a central orifice 670 Beyond the orifice 67 the bent-down portion is bent up again at 680 In order to mount the tilt rod, one first of all grips the two arms 62 and 63 and squeezes them qo that they move toward~ one another and the tilt rod 60 is passed through the openings 64 and 65 and the spring is then releasedO The arrangement is such that the spring clip will clamp on to the tilt rod and-will be difficult to move axially of the tilt rod~ The square cross-section of the orifices 64 and 65 is such as to engage two of the faces of the hexagonal tilt rod and two of the angles thereofO
The tilt rod is then moved so that its end engages in the recesq 36 and at this time the tip of the turn-up portion 68 will ride up the ramp surface 40 and will flex the bent-down portion 66 upwardlyO Continued movement to the left, as ~een in Figure 2, will enable the orifice 67 to pass beyond the end of the ramp 40 so that it will ~nap down over the end of the key 380 This will ~6~9~5 then prevent the tilt rod from being moved to the right and will hold it in placeO It will be appreciated that the tilt rod could equally be mounted to extend to the left, then being engaged in recess 35 in extension 33O
Figures 3 and 4 show a modified construction, like parts being indicated by like reference numeraLs, The figures show the mounting of a rotation control member 50 which is a disc.ha~ing approximate~y the same axial length as the stops 24, 25 which are turned up to form stops 24a, 25aO The disc 50 is provided with a central opening 51 and with eight equiangularly spaced radially outwardly extending notches 52~ On its outer periphery, the disc 50 has an outer circumferential portion 53 of reduced radius, this portion terminating in two abutments 54 and 55. This portion in fact extends around a control angle of, in this instance, approximately 180, Of course, a different angle could be chosen if it were so desired.
It can be seen from Figure 3 that the disc 50 is mounted on the extension 33 and that it is so mounted that one of the notches 53 i9 engaged on the key 37.
In order to hold the disc in place, a grub screw 56 is provided and thi~ i5 used to locate the disc at the same axial position as the stop 24aO
In use, rotation of the shaft 31 by means of the wand (not shown) will cause the worm to rotate and the il~609 ~;
wormwheel also to rotateO This in turn will cause tilting of the tilt rod about its axis until the ab~tment 52 or 53, depending on the direction of rotation, abuts the stop 24 whereupon further rotation will not be possibleO
It will be appreciated that if a different angle is desired, then one simply selects a different one of the notches 520 It will also be appreciated that this construction also can be uced the other way~round, t~at is with the tilt rod extending to the left rather than to the right and with the rotation control disc on the right rather than on the left~
The con~truction of the present invention is relatively simple and inexpensive to manufacture and is of universal use so that it can be operated either at one end or the other and that the facility is provided for altering the restriction of the rotation of the tilt rod, at will, to suit any particular useO This alteration can be achieved simply by selecting the particular one of the notches 52 which one uses to locate on the key 37 or 38.
Of course, when the rotation control disc 50 is mounted on the extension 34 engaging the key 38, the reduced section portion 53 and the abutments 54 and 55 will cooperate with the stop 25 rather than the stop 240 Figures6 and 7 show a different form of : rotational control memberO A first disc 80 is provided with a central opening 81 and eight equiangularly spaced radially extending notches 820 On its outer periphery 83 the disc 80 has a radial abutment projection 850 A second disc 90 with a central opening 91 has a similar radial abutment projection 850 Two axially e~te~ding, arrow-headed bifurcated pins 86 on the disc 90 can be engaged in two of eight cooperating apertures 87 in disc 80, these being located between adjacent notches 820 Before assembly the discs are rotated relat-ive to one another as indicated by the arrows to gi.ve the desired circumferential spacingO In a modification the discs 80 and 90 are made identical to one another and each has, for example, 7 apertures and one pinO This will redwce production costsO The assembled discs can be mounted in the same way as described aboveO
DESCRIPTION
"TILTER MECHANISM"
B~CKGROU~D OF THE INVENTION
The present invention relates to a tilter mechanism for the slats of a venetian blind.
Many forms of such tilter mechanism have been proposed before and these usually con~ist of a bracket which is mountable in the venetian blind headrail, the bracket carrying a housing in which are mounted a worm which can be rotated from the exterior, and a wormwheel which is operatively associated with the worm. A tilt rod which passes through one or more tilt rolls carryin~ the ladder means of the venetian blind is engaged in the wormwheel. The tilt rod is usually of non-circular, e.gO hexagonal or square cro3s-section, - and this engages in a correspondingly shaped opening ln the wormwheel. Known tilter mechanisms are relatively bulky, complex and expensive to manufacture.
In many instances, it is desirable that the venetian blind slats should only be rotatable by a ; ~ re~tricted amount to give a pleasing appearance to the exterior of a building which has a large number of such-venetian blinds therein. Certain proposals have been made for restricting the rotation of the blind but none ..
.
of these is particularly satisfactory and many of them are rather expensive to manufacture.
It is now proposed, according to the present invention, to provide a tilter mechanism for the slats of a venetian blind, said mechanism comprising a housing, means for mounting said housing on a venetian blind headrail, an externally operable worm rotatably mounted on said housing, a wormwheel rotatably mounted on said housing in operative engagement with said worm, an axial extension at each axial end of said wormwheel, a recess 10 in each of said extensions adapted to receive the end of a tilt rod such that the tilt rod can be inserted into either one of the recesses in said extensions and thus extend either to the left or to the right of said wormwheel, engaging means provided on each of said extensions, each of said engaging means being 15 engageable either by a locking device to hold said tilt rod in place or by a rotation control member mountable on the corresponding extension.
Such a structure can be manufactured relatively simply and the same tilter mechanism can be used whether or not 20 one is intending to have the mechanism at one end of the blind or the other. In other words the tilt rod can extend either from the left side or from the right side of the tilter mechanism.
~' , -"~
~ .., . .~., , . ~ .. . . . .. .
~609~5 It is also proposed to provide a rotation control member including two abutmentR, said control member.
being mountable on the other of said ex~ensions and for stop means to be provided on said bracket engage~ble by said abutments on said rotation control member to restrict rotation thereof., the engageable means on each of said extensions being engageable either by a locking device to hold said tilt rod in place or by said rotation control member, to define a particular rotational p~ition of said control member on said other extensionO
The rotation control member advantageously comprises at least one disc which ha~ a central opening, and at least one notch extending radially outwardly.
from the central opening,and two radially outwardly extending abutment surfaces adjacent the outer periphery of said at least one disc, these surfaces forming the abutments mentioned above~ The engaging means formed on the extension~ of the wormwheel can then comprise a : radially outwardly extending key on each of the axial extensions, the key being engageable in the notch or . notches of the disc, Preferably the disc has a plurality of notches which are equiangularly spaced from one another on the : disc, whereby the rotational position of the diw can be cho~en to give a particular rotational movement possibility for the tilt rodO
~6~ 5 The locking device which may be provided~ can be a spring which can be snap-fitted over the keyO For example, the locking device can be in the form of a spring clip which i8 mounta~le on the tilt rod and haY an oriice adjacent one end which is engageable over the keyO
- A particular advantageous arrangement is one in which each key has an inclined ramp surface at.the end remote from the wormwheel, the spring clip having an upturned end portion for sliding up the ramp surface, whereby the orifice can snap over the end of the key which is nearer to the wormwheelO The spring clip may, for example, comprise a V-~haped member which ha~ openings in each arm of the V, whereby the tilt rod can be pa~sed through the openings to mount the ~pring clip on the tilt rod, .one arm of the V having, at its free end, a bent-down end portion which includes the orifice.
It is also contemplated, according to the present invention, to provide a rotation control member for controlling the rotation of a venetian blind tilt rod, said rotation control member comprising at least one disc having a central opening, a plurality of equiangularly spaced notches extending radially outwardly from said central : opening, two radially outwardly extending abutment surfaces adjacent th,e outer periphery of said at lea~t one di~c, said member being mountable upon the wormwheel of a venetian blind tilter with one of the notche~ engaging a 9~s key on the wormwheel and the abutment surfaces being engageable with stops on the mountIng bracket of the tilter to control rotation of the tilt rod.
In order that the invention may more readily be understood, the following description i~ given, merely by way of example, reference being made to the accompanying drawings, in which:-Figure 1 is a section through a venetian blindheadrail with one embodiment of tilter mechani.sm according to the invention mounted therein, Figure 2 is a front elevation of the tilter mechanism of Figure 1, Figure 3 is a view similar to Figure 1 showing a second embodiment of tilter mechanism in the headrail, Figure 4 is an end view of the tilter of Figure 3 showing the rotation control member, and Figure 5 i8 a perspective view of the spring : clip locking device of the mechanisms of Figures 1 to 4, Figure 6 is a view similar to Figure 4, showing an alternative rotation control member, and Figure 7 i9 an exploded perspective view of the rotation control member of Figure 6.
The tilter mechanism illustrated in Figures 1 and 2 is shown as mounted in a headrail 10 having a front wall ll, a rear wall 12 and a lower web 13, The front and rear walls 11 and 12 have inturned rim~ 14 and 15 09 ~5 respectively, as is conventional, The tilter mechani~m is indicated by the general reference numeral 16 and compri~es a bracket 17 on which is mounted a housing 18, the bracket having lugs 19 which engage under the rim 15 while the housing 18 has a portion 20 engaging under the rim 140 The front bottom portion 21 of the bracket prQjects through an opening 22 formed in the headrailO
It wi l be noted that the lower wall 23 of the bracket 17 is provided with two turned up stop lugs 24 and 25 which may be turned up for a reason to be explained later, with reference to Figures 3 to 7O
Mounted for rotati.on within the housing 18 i~ a worm 30 which may be driven by its ~haft 31 connected to a conventional wand (not shown). A wormwheel 32 is rotatable about an axi~ perpendicular to the axi~ of the shaft 31 and is in operative engagement with the worm 30 so that rotation of the worm will cau~e rotation of the wormwheel, in a conventional manner~
Extendlng axially from each end of the wormwheel 32 are extension~ 33 and 34 respectively, the~e being provided with internal blind recesses 35 and 36 and are each ~ provided al~o with a radially outwardly extending key or ;~ projection 37,38~ It will be noted that each of the projections 37,38 includes, at the end remote from the wormwheel, an inclined ramp upper surface 39,400 9L~
Engaged in the hexagonal blind recess 36, is a hexagonal tilt rod 60 and this is held in place by a spring clip 61 which is shown in greater detail i~.
Figure 50 The spring clip is of a generally V-~haped.
-construction having two arm~ 62 and 63 provided with square cross-section holes 64 and 65~ The arm 63 has~
at its free end, a bent-down end portion ~6 which is provided with a central orifice 670 Beyond the orifice 67 the bent-down portion is bent up again at 680 In order to mount the tilt rod, one first of all grips the two arms 62 and 63 and squeezes them qo that they move toward~ one another and the tilt rod 60 is passed through the openings 64 and 65 and the spring is then releasedO The arrangement is such that the spring clip will clamp on to the tilt rod and-will be difficult to move axially of the tilt rod~ The square cross-section of the orifices 64 and 65 is such as to engage two of the faces of the hexagonal tilt rod and two of the angles thereofO
The tilt rod is then moved so that its end engages in the recesq 36 and at this time the tip of the turn-up portion 68 will ride up the ramp surface 40 and will flex the bent-down portion 66 upwardlyO Continued movement to the left, as ~een in Figure 2, will enable the orifice 67 to pass beyond the end of the ramp 40 so that it will ~nap down over the end of the key 380 This will ~6~9~5 then prevent the tilt rod from being moved to the right and will hold it in placeO It will be appreciated that the tilt rod could equally be mounted to extend to the left, then being engaged in recess 35 in extension 33O
Figures 3 and 4 show a modified construction, like parts being indicated by like reference numeraLs, The figures show the mounting of a rotation control member 50 which is a disc.ha~ing approximate~y the same axial length as the stops 24, 25 which are turned up to form stops 24a, 25aO The disc 50 is provided with a central opening 51 and with eight equiangularly spaced radially outwardly extending notches 52~ On its outer periphery, the disc 50 has an outer circumferential portion 53 of reduced radius, this portion terminating in two abutments 54 and 55. This portion in fact extends around a control angle of, in this instance, approximately 180, Of course, a different angle could be chosen if it were so desired.
It can be seen from Figure 3 that the disc 50 is mounted on the extension 33 and that it is so mounted that one of the notches 53 i9 engaged on the key 37.
In order to hold the disc in place, a grub screw 56 is provided and thi~ i5 used to locate the disc at the same axial position as the stop 24aO
In use, rotation of the shaft 31 by means of the wand (not shown) will cause the worm to rotate and the il~609 ~;
wormwheel also to rotateO This in turn will cause tilting of the tilt rod about its axis until the ab~tment 52 or 53, depending on the direction of rotation, abuts the stop 24 whereupon further rotation will not be possibleO
It will be appreciated that if a different angle is desired, then one simply selects a different one of the notches 520 It will also be appreciated that this construction also can be uced the other way~round, t~at is with the tilt rod extending to the left rather than to the right and with the rotation control disc on the right rather than on the left~
The con~truction of the present invention is relatively simple and inexpensive to manufacture and is of universal use so that it can be operated either at one end or the other and that the facility is provided for altering the restriction of the rotation of the tilt rod, at will, to suit any particular useO This alteration can be achieved simply by selecting the particular one of the notches 52 which one uses to locate on the key 37 or 38.
Of course, when the rotation control disc 50 is mounted on the extension 34 engaging the key 38, the reduced section portion 53 and the abutments 54 and 55 will cooperate with the stop 25 rather than the stop 240 Figures6 and 7 show a different form of : rotational control memberO A first disc 80 is provided with a central opening 81 and eight equiangularly spaced radially extending notches 820 On its outer periphery 83 the disc 80 has a radial abutment projection 850 A second disc 90 with a central opening 91 has a similar radial abutment projection 850 Two axially e~te~ding, arrow-headed bifurcated pins 86 on the disc 90 can be engaged in two of eight cooperating apertures 87 in disc 80, these being located between adjacent notches 820 Before assembly the discs are rotated relat-ive to one another as indicated by the arrows to gi.ve the desired circumferential spacingO In a modification the discs 80 and 90 are made identical to one another and each has, for example, 7 apertures and one pinO This will redwce production costsO The assembled discs can be mounted in the same way as described aboveO
Claims (10)
1. A tilter mechanism for the slats of a venetian blind, said mechanism comprising a housing, means for mounting said housing on a venetian blind headrail, an externally operable worm rotatably mounted on said housing, a wormwheel rotatably mounted on said housing in operative engagement with said worm, an axial extension at each axial end of said wormwheel, a recess in each of said extensions adapted to receive the end of a tilt rod such that the tilt rod can be inserted into either one of the recesses in said extensions and thus extend either to the left or to the right of said wormwheel, engaging means provided on each of said extensions, each of said engaging means being engageable either by a locking device to hold said tilt rod in place or by a rotation control member mountable on the corresponding extension.
2. A tilter mechanism according to claim 1, characterised in that a rotation control member is provided, in that this member includes two angularly spaced apart abutments, in that the rotation control member is mounted on one of said extensions thereby engaging the engaging means of said one extension and in that stop means are provided on the bracket engageable by said abutments to restrict rotation thereof.
3. A tilter mechanism according to claim 2 characterised in that the rotation control member comprises at least one disc having a central opening, at least one notch extending radially outwardly from said central opening, two radially outwardly extending abutments extending from the periphery of said at least one disc and in that said engaging means on each said axial extension comprises a radially outwardly extending key on said extension, said key being engageable in said at least one notch.
4. A tilter mechanism according to claim 3 characterised in that said disc comprises a plurality of notches equiangularly spaced from one another on said disc, whereby the rotational position of said disc can be chosen to give a particular rotational movement possibility for said tilt rod.
5. A tilter mechanism according to claim 1 or 2 characterised in that said engaging means on each said axial extension comprises a radially outwardly extending key on said extension.
6. A tilter mechanism according to claim 1 in combination with a tilt rod and further characterised in that a locking device is provided to hold said tilt rod in engagement with said recess in one of said extensions, and in that said locking device can be snap-fitted over said engaging means.
7. A tilter mechanism according to claim 6, characterised in that said engaging means on each said axial extension comprises a radially outwardly extending key on said extension, said locking device comprising a spring clip mountable on said tilt rod and having an orifice adjacent one end engageable over said key.
8. A tilter mechanism according to claim 7, characterised in that said key has an inclined ramp upper surface at the end remote from said wormwheel and in that said spring clip has an upturned end portion for sliding up said ramp surface, whereby said orifice can snap over the end of said key nearer said wormwheel.
9. A tilter mechanism according to claim 7, characterised in that said spring clip comprises a V-shaped member having openings in each arm of the V, whereby said tilt rod can be passed through said openings to mount said spring clip on said tilt rod, and in that one arm of the V
has, at its free end, a bent-down end portion including said orifice.
has, at its free end, a bent-down end portion including said orifice.
10. A tilter mechanism for the slats of a venetian blind, said mechanism comprising a mounting bracket for mounting the mechanism securely to a venetian blind headrail;
a housing connected to said bracket; an externally operable worm rotatably mounted in said housing; a wormwheel mounted for rotation about an axis in said housing in operative engagement with said worm, an elongated tilt rod, an axial extension being provided on each axial end of said wormwheel, a recess being formed in each extension, one end of said tilt rod being received in one said recess with the tilt rod extending away from the corresponding extension of said wormwheel along the axis of rotation thereof, a V-shaped spring clip having openings in each arm of the V, said tilt rod extending through said openings to thus mount said spring clip on said tilt rod, one arm of the V having at its free end a bent-down portion including an orifice, a rotation control disc having a central opening, at least one notch extending radially outwardly from said central opening, and two radially outwardly extending abutment surfaces being provided adjacent the outer periphery of said rotation control disc, said rotation control disc being mounted on the other of said extensions of said wormwheel, stop means being provided on said bracket engageable by said abutment surfaces on said rotation control disc to restrict rotation thereof; and a radially outwardly extending key on each axial extension of said wormwheel, one said key being engaged in the orifice provided in the bent-down end portion of said V-shaped clip, and the other said key being engaged by one of said notches on said rotation control disc to define a particular rotational position thereof.
a housing connected to said bracket; an externally operable worm rotatably mounted in said housing; a wormwheel mounted for rotation about an axis in said housing in operative engagement with said worm, an elongated tilt rod, an axial extension being provided on each axial end of said wormwheel, a recess being formed in each extension, one end of said tilt rod being received in one said recess with the tilt rod extending away from the corresponding extension of said wormwheel along the axis of rotation thereof, a V-shaped spring clip having openings in each arm of the V, said tilt rod extending through said openings to thus mount said spring clip on said tilt rod, one arm of the V having at its free end a bent-down portion including an orifice, a rotation control disc having a central opening, at least one notch extending radially outwardly from said central opening, and two radially outwardly extending abutment surfaces being provided adjacent the outer periphery of said rotation control disc, said rotation control disc being mounted on the other of said extensions of said wormwheel, stop means being provided on said bracket engageable by said abutment surfaces on said rotation control disc to restrict rotation thereof; and a radially outwardly extending key on each axial extension of said wormwheel, one said key being engaged in the orifice provided in the bent-down end portion of said V-shaped clip, and the other said key being engaged by one of said notches on said rotation control disc to define a particular rotational position thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US4369679A | 1979-05-30 | 1979-05-30 | |
| US043,696 | 1979-05-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1160945A true CA1160945A (en) | 1984-01-24 |
Family
ID=21928419
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000344694A Expired CA1160945A (en) | 1979-05-30 | 1980-01-30 | Tilter mechanism |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1160945A (en) |
| DE (1) | DE3008046C2 (en) |
| GB (1) | GB2051934B (en) |
| IT (1) | IT1130694B (en) |
| MX (1) | MX148774A (en) |
| NL (1) | NL8003099A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH702589A8 (en) * | 2010-01-26 | 2011-09-15 | Griesser Holding Ag | Turning device and method for adjusting the working position in a Rafflamellenstore. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2052507A7 (en) * | 1970-06-12 | 1971-04-09 | Hunter Douglas | |
| US3828838A (en) * | 1973-03-08 | 1974-08-13 | Levolor Lorentzen Inc | Venetian blind having tilt-limiting attachment |
| US3918513A (en) * | 1974-04-30 | 1975-11-11 | Alcan Aluminum Corp | Venetian blind with worm gear tilting assembly |
-
1979
- 1979-08-03 MX MX178774A patent/MX148774A/en unknown
-
1980
- 1980-01-30 CA CA000344694A patent/CA1160945A/en not_active Expired
- 1980-03-03 DE DE3008046A patent/DE3008046C2/en not_active Expired
- 1980-05-02 GB GB8014717A patent/GB2051934B/en not_active Expired
- 1980-05-29 IT IT22409/80A patent/IT1130694B/en active
- 1980-05-29 NL NL8003099A patent/NL8003099A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| MX148774A (en) | 1983-06-14 |
| GB2051934B (en) | 1983-08-03 |
| IT1130694B (en) | 1986-06-18 |
| DE3008046C2 (en) | 1982-06-16 |
| IT8022409A0 (en) | 1980-05-29 |
| DE3008046A1 (en) | 1980-12-11 |
| NL8003099A (en) | 1980-12-02 |
| GB2051934A (en) | 1981-01-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |