Abstract:
A carrier and spacer assembly for an architectural covering, such as a vertical Venetian blind, comprising a longitudinally-arrayed plurality of carriers that are slidably arranged for longitudinal movement along a longitudinally-extending tilt rod between open and closed positions. In open position, the carriers are spaced apart along the tilt rod, and in the closed position, the carriers are adjacent to one another at a one end of the tilt rod. A mechanism is provided for pulling a first carrier along the tilt rod between the open and closed positions. A plurality of elongated spacers are disposed between the adjacent carriers, connecting them together along the tilt rod. Each spacer includes a leading end portion which extends towards the open position and engages a carrier and a trailing end portion which extends towards the closed position and engages an adjacent carrier. The trailing end portion of each spacer is longitudinally overlapped by the leading end portion of the adjacent spacer, wherein the leading end portion of each spacer contacts a carrier laterally farther from the tilt rod than its trailing end portion contacts an adjacent carrier when the carriers and spacers are moved longitudinally towards the open position.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application corresponds to and claims priority to European Application No. 99201729.3, filed May 31, 1999. This European application is hereby incorporated by reference as though fully set forth herein. 
    
    
     BACKGROUND OF THE INVENTION 
     a. Field of the Invention 
     This invention relates to a carrier and spacer assembly for a head rail of an architectural covering, such as a covering for an architectural opening, like a window or door. This invention particularly relates to carriers and spacers for holding, moving and tilting vertically arranged louvers of a louvered venetian blind. 
     b. Background Art 
     Vertical venetian blinds have generally been provided with horizontally-extending head rails, holding a plurality of carriers or travellers that can be moved in spaced apart relationship along the longitudinal length of each head rail Each carrier has typically supported a vertically-extending louver or slat in such a manner that the consumer of the venetian blind could move the louver along the length of the head rail (e.g., by pulling on a first operating cord or pull cord) and also could rotate or tilt the louver about its vertical axis (e.g., by pulling on a second operating cord or tilt cord). For this purpose, each carrier has typically included a vertically oriented, drive hub or worm wheel, provided on top with a worm gear or the like. The bottom of each drive hub has supported a depending louver holder, adapted to hold securely the top of a louver while its carrier has been moved longitudinally and while the drive hub has been rotated so as to move the louver holder and the louver and tilt them about their common vertical axis. In this regard, a longitudinally-extending tilt rod or drive shaft has been provided in the head rail, extending through the carriers and engaging their worm gears, whereby rotation of the tilt rod about its longitudinal axis has caused the drive hubs of the carriers to rotate about their vertical axes so as to make the louver holders and the attached louvers tilt together. 
     The carriers in the head rails of vertical venetian blinds have also generally been provided with a plurality of longitudinally-extending spacers which keep the carriers and the louvers, supported by the carriers, in spaced-apart relationship when the carriers and louvers are moved longitudinally along the head rail, apart from each other, to close the blinds and cover their windows. The spacers have generally been longitudinally-elongated thin pieces of stainless steel or the like. Typically, the rear or closed end of each spacer has been fixed on a carrier and the front or open end has been slidably positioned on a smooth horizontal surface within a longitudinally-extending channel or groove of an adjacent carrier. When a blind has been closed, the front or lead carrier of the blind has been pulled frontally, away from its (rearwardly) adjacent carrier and has slid along the spacer that is slidably positioned within its channel and fixed to the adjacent carrier, when the lead carrier has reached the open end of the spacer of the adjacent carrier, the lead carrier has then started to pull the adjacent carrier frontally, and the adjacent carrier has slid along the spacer that is slidably positioned within its channel and fixed to the next (rearwardly) adjacent carrier. Tis has continued until all the carriers are spaced apart by the spacers between them. When the blind has been closed, the lead carrier of the blind has been pulled rearwardly, towards its adjacent carrier and has slid along the spacer that is slidably positioned within its channel and fixed to the adjacent carrier, when the lead carrier has reached the adjacent carrier, the lead carrier has then started to push the adjacent carrier rearwardly, and the adjacent carrier has slid along the spacer that is slidably positioned within its channel and fixed to the next adjacent carrier. This has continued until all the carriers have been pushed together. See, for example, the carriers and their spacers in U.S. Pat. Nos. 5,092,386, 4,887,657, 4732,202, 4,559,670 and 4,335,775. 
     However, vertical venetian blinds have generally not been as easy for consumers to open and close as blind manufacturers would wish. This has been due to friction between the moving parts of the head rails of such blinds. Friction in the head rails has required consumers to expend significant amounts of energy when using the pull cords of the blinds or required relatively heavy motors for motor-operated blinds. 
     BRIEF SUMMARY OF THE INVENTION 
     It is an object of the invention to overcome or at least reduce the above problems. 
     In accordance with a first aspect of this invention, a carrier and spacer assembly is provided for an architectural covering, such as a vertical venetian blind, that comprises: 
     a plurality of elongate, vertically-extending, covering portions which can be moved longitudinally between first and second positions; 
     a longitudinally-arrayed plurality of carriers, each of which is connected to an upper end portion of one of the covering portions; the plurality of carriers including a lead first carrier and a second carrier, adapted to be moved longitudinally by longitudinal movement of the first carrier, and a third carrier, adapted to be moved longitudinally by longitudinal movement of the second carrier; 
     a longitudinally-extending tilt rod, along which the carriers, are slidably arranged and can be moved longitudinally, with the covering portions, between the first and second positions; in one of the positions, the covering portions being spaced apart along the tilt rod, and in the other position, the covering portions being adjacent to one another at a longitudinal end of the tilt rod; 
     means for pulling the first carrier along the tilt rod between the first and second positions; and 
     means for moving the other carriers, with the fast carrier, along the tilt rod between the first and second positions; the moving means including a longitudinally-arrayed plurality of longitudinally-extending spacers, each of which is provided between a pair of adjacent carriers; each spacer having a leading end portion which extends towards the first position and engages a carrier, and a trailing end portion which extends towards the second position and engages an adjacent carrier, the trailing end portion of each spacer and the leading end portion of the adjacent spacer being longitudinally overlapped; 
     wherein the leading end portion of each spacer contacts a carrier farther from the tilt rod than its trailing end portion contacts an adjacent carrier when the carriers and spacers are moved longitudinally towards the first position, whereby the carriers are easier to move longitudinally towards the first position, particularly where the first position is the closed position of the architectural covering and the second position is the open position of the architectural covering. 
     Advantageously, the tilt rod and the spacers are on laterally opposite sides of the carriers and the leading end portion of each spacer contacts a carrier laterally farther from the tilt rod than its trailing end portion contacts an adjacent carrier when the carriers and spacers are moved longitudinally toward the first position. It is especially advantageous that the spacers are horizontally aligned and the trailing end portion of each spacer underlies the leading end portion of an adjacent spacer. It is particularly advantageous that: the spacers are elongate strips and each carrier includes a channel, within which a spacer can move longitudinally along a horizontal bottom surface of the channel; and the trailing end portion of a spacer and the overlying leading end portion of an adjacent spacer are positioned in the channel with sufficient lateral play to allow relative angular sliding movement of the end portions of the spacers and of the channel of the carrier when the spacers and the carrier are moved longitudinally. It is quite particularly advantageous that only a lateral side portion of the trailing end portion of each spacer engages a carrier, and the lateral side portion is closer to the tilt rod than is a longitudinal center of the spacer. In this regard, it is especially advantageous that the leading end portion of each spacer includes an upwardly extending hook which can contact a lateral surface portion of a bridge overlying a horizontally-extending channel of a carrier, within which channel the spacers can move longitudinally, and the trailing end portion of the spacer includes a downwardly-extending hook adapted to contact only a lateral surface portion of an adjacent carrier that is laterally closer to the tilt rod than is the lateral surface portion of the bridge. Advantageously, the lateral surface portion of the adjacent carrier is outwardly adjacent to the channel and forms a part of a bottom edge of the channel, which bottom edge is tapered, laterally away from the tilt rod, in the first direction, particularly where the bottom edge is tapered at an angle of less than about 10°, quite particularly at an angle of about 0.5-5°. 
     In accordance with a second aspect of this invention, a carrier is provided for a head rail of an architectural covering, that is easier to move along a longitudinally-extending spacer in the head rail and that comprises: a longitudinally-extending channel, in which the spacer can be slidably positioned; opposite longitudinally-extending sides of the channel being tapered laterally outwardly of the channel from the center of each lateral side to its laterally-extending sides. Advantageously, each longitudinally-extending side of the channel is tapered laterally outwardly of the channel from the center of each longitudinally-extending side to its laterally-extending side at an angle of less than about 10°, preferably at an angle of about 0.5-5°. It is particularly advantageous that the channel comprise a longitudinally-extending horizontal surface and upstanding, opposite longitudinally-extending sides; a trailing end position of one of a longitudinally-arrayed plurality of spacers underlying the leading end portion of an adjacent one of the spacers on the horizontal surface. 
     In accordance with a third aspect of this invention, a head rail is provided for an architectural covering, including the carrier and spacer assembly of the invention. 
     In accordance with a fourth aspect of this invention, an architectural covering, particularly a vertical venetian blind, is provided, comprising the head rail of the invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective side view of a vertical venetian blind with a head rail that supports a plurality of vertical louvers by means of a carrier and spacer assembly of this invention; 
     FIG. 2 is a perspective side view of four of the carriers and spacers within the head rail of FIG. 1, with one carrier and one spacer detached from the others; 
     FIG. 3 is a top view of the four carriers and spacers of FIG. 2; 
     FIG. 4 is an enlarged detail top view of the circled area IV in FIG. 3, showing the attachment of two spacers to one of the carriers; 
     FIG. 5 is a sectional view, taken along line V—V in FIG. 4; and 
     FIG. 6 is a sectional view, taken along line VI—VI in FIG.  4 . 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Further aspects of the invention will be apparent from the detailed description below of a particular embodiment and the drawings thereof. 
     FIG. 1 shows a vertical blind  1  having a plurality of vertical louvers  3  suspended from its horizontally- and longitudinally-extending head rail  5 . The louvers  3 , shown in FIG. 1, are conventional metal, plastic or fabric slats, each having an upper marginal portion  7  securely suspended vertically from a holder  9 , supported by the carriers (not shown) in the head rail  5 . 
     FIG. 2 shows a longitudinally-arrayed plurality of the carriers, generally  11 , within the head rail  5  shown in FIG.  1 . (or clarity, the head rail  5  is not shown in FIGS.  2 - 4 ). The bottom of each carrier  11  has one of the holders  9  extending downwardly from about its lateral and longitudinal center. The carriers  11  and holders  9  are preferably made of plastic. 
     A longitudinally-arrayed plurality of longitudinally-extending elongate spacers, generally  13 , are also provided in the head rail  5 . The spacers  13  are on one longitudinally-extending side of the carriers  11  and are preferably made of thin stainless steel or plastic. The spacers  13  keep the carriers  11  in longitudinally spaced-apart relationship when the carriers are moved to the right along the head rail  5 —from a position, in which they are stacked at the left end of the head rail when the blind  1  is open to another position in which they are spread apart along the length of the head rail when the blind  1  is closed. In this regard, each carrier  11  preferably has a longitudinally-extending channel  14 , in which a spacer  13 , attached to an adjacent carrier, can slide longitudinally as described below. 
     As shown in FIG. 1, the left side of the head rail  5  is provided with a conventional pull cord  15  connected to a conventional lead carrier  11 ′. As seen from FIGS. 2 and 3, the lead carrier  11 ′ is adapted: i) to be moved by the pull cord  15  to the right along the head rail  5  and then to pull the other carriers  11 ″,  11 ′″, etc.—by means of the spacers  13 —to the right along the head rail to close the blind  1 ; and ii) to be moved by the pull cord  15  to the left along the head rail  5  and then to push the other carriers  11 ″, 11 ′″, etc. to the left along the head rail  5  to open the blind  1 . 
     As shown in FIG. 1, the left side of the head rail  5  is provided with a conventional pull cord  15  connected to a conventional lead carrier  11 ′. As seen from FIGS. 2 and 3, the lead carrier  11 ′ is adapted: i) to be moved by the pull cord  15  to the right along the head rail  5  and then to pull the other carriers  11 ″,  11 ′″,  11 ″″, etc.—by means of the spacers  13 —to the right along the head rail to close the blind  1 ; and ii) to be moved by the pull cord  15  to the left along the head rail  5  and then to push the other carriers  11 ″,  11 ′″,  11 ″″, etc. to the left along the head rail  5  to open the blind  1 . 
     Except as described below with reference to FIGS. 3-6, the head rail  5  and its components, as shown in FIGS. 1 and 2, are conventional In this regard, the structure of the carriers  11 , holders  9 , spacers  13  and louvers  3  and their controlled longitudinal movement along the length of the head rail  5  and the controlled tilt of the carriers  11  and louvers  3  are generally known (e.g., from U.S. Pat. Nos. 4,732,202 and 4,335,775). 
     In particular, each carrier  11 , as shown in FIG. 2, has a pair of conventional rollers or wheels  19  on opposite longitudinally-extending sides of its housing  21 . The carrier moves on the rollers  19  along longitudinally-extending tracks (not shown) on laterally opposite sides of the interior of the head rail  5 , along its length, in response to movement of the pull cord  15 . 
     The housing  21  of each carrier  11  also has a pair of conventional, longitudinally-aligned circular openings  23 . The openings  23  are located on longitudinally opposite sides of the carrier and on the lateral side of the carrier opposite the spacers. The tilt rod  18  of the head rail  5  can pass through the openings  23  to engage a worm gear (shown schematically in FIG.  3 ), driving a conventional drive hub  25  within the carrier housing  21 , so that rotation of the tilt rod, in response to movement of the bead chain  17 , causes rotation of the drive hub  25  within the carrier. In this regard, the openings  23  are preferably located rearwardly of the drive hub  25  which is located rearwardly of the spacers  13 , whereby the tilt rod  18  is located at the rear of the head rail and rearwardly of the spacers  13 . 
     A lower portion of each drive hub  25  holds a vertically-extending upper part of one of the holders  9  which support the louvers  3 . In this regard, a pair of conventional vertically-aligned circular openings  26  are also provided on the top and bottom of the housing  21  of each carrier, near its lateral and longitudinal center, to acconmuodate its hub  25  and holder  9 . 
     FIGS. 2 and 3 show the longitudinally-arrayed plurality of the carriers  11  and their channels  14 , in which are the longitudinally-arrayed plurality of spacers  13 . In a conventional manner, the right or leading end  13 A of each spacer (e.g.,  13 ″) overlaps longitudinally the left or trailing end  13 B of an adjacent spacer (e.g.,  13 ′), to the right. Also in a conventional manner, the trailing end  13 B of each spacer (e.g.,  13 ″) is fixed to an innermost surface  27  of the channel  14  of a carrier (e.g.,  11 ′″), adjacent the left or trailing end  28  of the innermost surface  27  of the channel  14 . Further in a conventional manner, each spacer (e.g.,  13 ″) is adapted to slide smoothly in a longitudinal direction, within the channel  14  of an adjacent carrier (e.g.,  11 ″), to the right, and past the trailing end  13 B of an adjacent spacer (e.g.,  13 ′), to the right, that is fixed to the trailing end  28  of the innermost surface  27  of the channel  14  of the adjacent carrier, and past the right or leading end  29  of the innermost surface  27  of the channel of the adjacent carrier when the carriers  11  and the louvers  3  thereon are moved to the right to close the blind  1  or moved to the left to open it. As shown in FIGS. 2-3, it is preferred that the spacers  13  are horizontally aligned, and accordingly, the leading end  13 A of each spacer (e.g.,  13 ″) overlies the trailing end  13 B of an adjacent spacer (e.g.,  13 ′), to the right, and the innermost surface  27  of the channel  14  of each carrier  11 , to which the trailing end  13 B of one of the spacers (e.g.,  13 ″) is fixed, is the channel&#39;s bottom surface  27  which is also preferably aligned horizontally. 
     As seen from FIGS. 2-6, there is preferably a first hook  30 , near the leading end  13 A of each spacer  13 , that extends upwardly and to the left and a second hook  31 , at the leading end  13 A of each spacer  13 , that extends upwardly and to the left. There is preferably also a third hook  32  that is near the trailing end  13 B of each spacer  13 , that extends downwardly and to the left into a hole  32 A (shown in FIG. 5) in the bottom surface  27  of the channel  14 , adjacent its trailing end  28 , that can pivot laterally within the hole  32 A and that can engage a confronting laterally-extending trailing edge of the hole  32 A when moved to the left, relative to the hole. In addition, a fourth hook  33 , at the trailing end  13 B of each spacer  13 , preferably extends downwardly and to the left and is located to the left of, and in contact with, the trailing end  28  of the bottom surface  27  of the channel  14 . The hooks  30 - 34  are preferably symmetrical about the longitudinally-extending center axis of each spacer  13 . 
     In a conventional manner: the first hook  30  of each spacer (e.g.,  13 ″), fixed to a carrier (e.g.,  11 ′″), engages a laterally-extending bridge member  34  overlying the channel  14  of the adjacent carrier (e.g.,  11 ″), to the right, so that the spacer (eg.,  13 ″) and its carrier (e.g.,  11 ′″) are pulled to the right when the adjacent carrier (e.g.,  11 ″) is moved to the right to close the blind  1 ; and the second hook  31  of the spacer (e.g.,  13 ″) keeps its leading end  13 A from moving beneath the bridge member  34  of the channel  14  of the next adjacent carrier (e.g.,  11 ′) when the next adjacent carrier is moved to the left towards the adjacent carrier (e.g.,  11 ′) to open the blind  1 . The third and fourth hooks  32 ,  33  of each spacer (e.g.,  13 ″) hold, between them, the trailing edge of the hole  32 A in the bottom surface  27  of the channel  14  of the carrier (e.g.,  11 ′″), to which the spacer is fixed, and the trailing end  28  of the bottom surface  27  of the channel of the carrier in a generally conventional manner, except as described below. Thereby, the third and fourth hooks  32 ,  33  hold the trailing end  13 B of the spacer (e.g.,  13 ″) adjacent the trailing end  28  of the bottom surface  27  of the channel  14  of the career (e.g.,  11 ′″). In this regard, the fourth hook  33  of the spacer (e.g.,  13 ″) engages the trailing end  28  of the bottom surface  27  of the channel  14  of the carrier (e.g.,  11 ′″) and urges the carrier to the right when the spacer is pulled to the right with the adjacent carrier (e.g.,  11 ″), to the right, to close the blind  1 . 
     In accordance with one aspect of this invention, the upstanding longitudinally-extending sides  35  and  37  of the channel  14  of each carrier  11  are tapered laterally outwardly of the channel  14  from the longitudinal center of each longitudinally-extending side to its laterally-extending sides as best shown in FIGS. 4-6. In this regard, the left and right parts,  39  and  41  respectively, of the front side  35  of the channel  14 , shown in FIGS. 4 and 6, are tapered frontally from the longitudinal center of the front side  35  to its left and right sides. Likewise, the left and right parts,  43  and  45  respectively, of the rear side  37  of the channel  14 , shown in FIGS. 4 and 5, are tapered rearwardly from the longitudinal center of the rear side  37  to its left and right sides. The dimensions of the taper of the front and rear parts of the longitudinally-extending sides  35 ,  37  are not considered critical, but a taper for each part of an angle of less than about 10° is generally preferred, particularly an angle of about 0.5-5° (i.e., about 0.005-0.1 mm). 
     The taper of the left parts  39 ,  43  and right parts  41 ,  43  of the front and rear sides  35 ,  37  of the channel  14  of each carrier  11 , in accordance with this invention, allows each carrier  11  to yaw (i.e., pivot laterally) somewhat, relative to the spacer  13  within the channel  14 , when the carrier is moved longitudinally to open and close the blind  1 —without the longitudinally-extending sides of the spacer  13  rubbing excessively against the longitudinally-extending sides  35 ,  37  of the channel. 
     For example, when the pull cord  15  is moved so as to close the blind  1 , the lead carrier  11 ′ moves to the right along the head rail  5  and along a first spacer (e.g.,  13 ′), slidably positioned within the lead carrier&#39;s channel  14 , until the lead carrier reaches the right side of the first spacer  13 ′. Then as the lead carrier  11 ′ continues to move to the right, the bridge member  34  of the channel  14  of the lead carrier  11 ′ pulls the first hook  30  of the first spacer  13 ′ to the right, and the third and fourth hooks  32 ,  33  of the first spacer  13 ′ pull the adjacent second carrier  11 ″ to the right, whereby the second carrier moves along the second spacer  13 ′, slidably positioned within the second carrier&#39;s channel  14 , until the second carrier  11 ″ reaches the right side of the second spacer  13 ′. As the lead carrier  11 ″ continues to move to the right, this process continues until all the carriers  11  have been moved apart to the right to close the blind  1 . 
     During this process of closing the blind  1 , the carriers  11  will tend to yaw because the third and fourth hooks  32 ,  33  of the spacers  13  do not pull the carriers from their lateral centers (or longitudinally-extending axis). Rather, the spacers  13  pull on only one side of the lateral centers (i.e., the front) of the carriers  11 . Such inevitable yaw can cause friction between the moving spacers  13  and carriers  11 . In this regard, yaw can cause the longitudinally-extending sides of a carrier&#39;s channel  14  to rub against the longitudinally-extending sides of the spacer within the channel. However, tapering the left and right parts  39 ,  41 ,  43 ,  45  of the longitudinally-extending sides  35 ,  37  of the channel  14  allows each carrier  11  to slide more freely and with less friction past the spacer  13  within its channel when the carrier yaws. This is because the longitudinally-extending sides of the spacer are less likely to rub against either longitudinally-extending side  35 ,  37  of the channel  14  and are much less likely to rub simultaneously against both longitudinally-extending sides of the channel when the carrier yaws. 
     In accordance with another aspect of this invention, the trailing end  28  of the bottom surface  27  of the channel  14  of each carrier  11  is tapered inwardly (to the right) of the channel, from the rear end of the trailing end  28  to its front end as shown in FIGS. 3-6. Preferably, the leading end  29  of the bottom surface  27  of the channel  29  of each carrier  11  is also tapered longitudinally inwardly (to the left) of the channel from the rear end of the leading end  29  to its front end as shown in FIGS. 3 and 4, so that the carrier  11  can be used to open and close the blind in either longitudinal direction. As a result of the trailing end  28  of the bottom surface  27  of the channel  14  of each carrier  11  being tapered longitudinally inwardly of the channel, the fourth hook  33  is adjacent to the trailing end  28  only adjacent the left part  43  of the rear side  37  of the channel  14 . The dimensions of the taper of the trailing and leading ends  28 ,  29  of the channel  14  of each carrier are not considered critical, but a taper for each edge of an angle of less than about 10° is generally preferred, particularly an angle of about 0.5-5° (ie., about 0.005-0.1 mm). 
     The taper of the trailing end  28  of the bottom surface  27  of the channel  14  of each carrier  11 , in accordance with this invention, tends to reduce substantially friction between the carrier  11  and the tilt rod  18  (as shown in FIG. 3) when the carrier is pulled to the right (as shown in FIGS. 2-3) along the tilt rod by the fourth hook  33  of the spacer  13 , fixed to its trailing end  28 , to close the blind  1 . Significant friction results from the fact that all the carriers  11 , pulled to the right by the lead carrier  11 ′, tend inevitably to yaw counter-clockwise when viewed from the top (as in FIGS.  3  and  4 ), because the fourth hooks  33  of the spacers  13  pull the carriers to the right on only one side of the lateral centers (i.e., the front) of the carriers. Such yaw causes the edges of the right openings  23  of the carrier housings  21 , as well as the worm gears within the carrier housings, to be urged rearwardly against the tilt rod  18 , thereby increasing the friction between them as the carriers are pulled to the right along the tilt rod. 
     However, such counter-clockwise yaw is substantially reduced with each of the carriers (e.g.,  11 ″) of this invention because the fourth hook  33  of the spacer (e.g.,  13 ′), fixed to the trailing end  28  of the bottom surface  27  of the channel  14  of the carrier, pulls the trailing end  28  of the carrier only adjacent the rear side  37  of its channel  14 —which is laterally closer to the tilt rod  18 . As a result, the counter-clockwise yaw of the carrier (e.g.,  11 ″) is reduced. In addition, the first hook  30  of the spacer (e.g.,  13 ″), attached to the bridge  34  of the carrier (e.g.,  11 ″), pulls the bridge to the left (as shown in FIGS. 2-3) as a result of the inertia of the remaining stack of spacers (not shown), to be pulled to the right to close the blind  1 . As a result, the carrier (e.g.,  11 ″) pivots clockwise somewhat, so that its counter-clockwise yaw is substantially reduced. Thereby, the edges of the right opening  23  of the carrier housing  21 , as well as the worm gear within the carrier housing, are less forcefully urged rearwardly against the tilt rod  18  and the friction is substantially reduced between them as the carrier (e.g.,  11 ″) is pulled to the right along the tilt rod to close the blind. 
     This invention is, of course, not limited to the above-described embodiment which can be modified without departing from the scope of the invention or sacrificing all of its advantages. In this regard, the terms in the foregoing description and the following claims, such as “longitudinal”, “lateral”, “above”, “below”, “top”, “bottom”, “vertical”, “horizontal”, “right”, “left”, “front”, “rear”, “frontally” and “rearwardly”, have been used only as relative terms to describe the relationships of the various elements of the carrier and spacer assembly of the invention for a head rail of an architectural covering. In this regard, the vertical louvers  3  of the vertical blinds  1  could be replaced by other vertical sections of an architectural covering, for example by: i) vertical sections of a conventional drapery fabric or a vaned fabric as described in PCT publication WO 96/35854 or ii) vertical vanes as described in PCT publication WO 96/35881. 
     Furthermore, the reduction in friction between the carriers  11  and the tilt rod  18 , when closing the blind  1 , could also be achieved by tapering longitudinally outwardly the fourth hook  33  of each spacer  13 , rather than tapering longitudinally inwardly the adjacent trailing edge  28  of the innermost surface  27  of the longitudinally-extending channel  14  of each carrier  11 , so that the fourth hook  33  would only contact the rear portion of the trailing edge  28  of the carrier&#39;s channel when pulling the trailing edge  28  to close the blind  1 . Moreover, such reduction in friction could be further reduced by having the first hook  30  of each spacer located frontally of its longitudinally-extending center axis, so that the first hook  30  contacts the bridge  34  of the carrier  11 , to which it is attached, frontally of the longitudinally-extending center axis of the carrier&#39;s channel  14 , in order that the carrier pivots clockwise (as viewed in FIGS. 3 and 4) somewhat more under the effects of the pull to the left of the first hook when closing the blind  1 . 
     Moreover, the spacers  13  could also be aligned generally vertically, instead of horizontally, and could be on the same, instead of the opposite, longitudinally-extending side of the carriers  11  as the openings  23  in their housings  21  and the tilt rod  18 , passing through the openings. Accordingly, the innermost surface  27  of the channel  14  of each carrier  11  could be an upstanding, vertically-aligned surface, instead of a horizontally-aligned bottom surface as shown in FIGS. 1-6. 
     Alternatively, the spacers  13  could be replaced by flexible chains or ropes that are fixed to adjacent carriers  11  as described, for example, in U.S. Pat. No. 2,869,636. In this regard, the leading end portion of each flexible chain or rope could be suitably attached to a carrier (e.g.,  11 ″) farther from a tilt rod ( 18 ) than its trailing end portion is attached to an adjacent carrier (e.g.,  11 ″).