US2275273A - Ladder web - Google Patents

Description

March 3, 1942. s rJ, TAYLOR 2,275,273

LADDER WEB Filed Sept. 16, 1940l 3 Sheets-Shee'l l March 3, 1942. s. J. TAYLOR 2,275,273

LADDER WEB Filed Sept. 16, 1940 ,3 Sheets-Sheet 2 Patented Mar. 3, 1942 UNITED STATES PATENT OFFICE ALamina WEB A rassegnarsi l town, Conn., a corporation of Connecticut A Application September 16, 1940, Serial No. 356,971-

9 Claims.

This invention relates to improvements in ladder-web which is primarily employed for supporting the slats of Venetian blinds or the like.

One object of this invention is to provide an 'improved ladder-Web of lower cost.

i passage through the slats of the blindl when opened of an increased amount oi air and light.

A further Objectis to produce a tape which collects less dust, and shows stains and discolorations to a less degree than the usual nat wide tape.

With the above and other objects in view, as

will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior artf In vthe accompanying drawings forming part of the present disclosure. in which certain ways of carrying out the invention are shown for illustrative purposes:

Fig. 1 is a perspective View of a fragmental portion of a Venetian blind employing ladderweb made in accordance with the present invention;

Fig. 2 is a front elevation of the construction shown in Fig. 1; I

Fig. 3 is a front elevation similar to Fig. 2 with the slats of the Venetian blind in partially closed position;

Fig. 4 is a horizontal-sectional vview online Ii-B of Fig. 2;'

Fig. 5 is an enlarged fragmental `perspectiveview of a portion of a Venetian blind employing ladder-web made in accordance with the present invention, with the knitted construction shownA in opened-up'or loosened condition for clearness;

Fig. 6 is a perspective View similar to Fig. 5 of a modified form of ladder-Web, but omitting the blind slats and raising rope;

Fig. 7 is a perspective view similar to Fig. 6 of still another modied form of ladder-Web made in accordance with the present invention; and

Fig. 8 is a fragmental perspective view similar to the lower left-hand portion of Fig. 7, showing the use of two strands constituting the member which is knittedto form a cord-like main web.

In the description 'and claims, the various parts and steps are identiiied by speciflcnames for convenience but they are intended to be as generic the ladder-web generallydesignated by the nu- 5 meral ill includes front .and back or. rst and second vertical cord-like"main webs II -and I2 interconnected at suitable' intervals by ladders I3 each formed of a pair of strands I6 and I5. Venetian-blind slats I6 rest upon the ladders I3 10 and each slat I6 has a usual slot I1. A raising rope I8 extends between the ladder-strands It and I5 and through the slots Il in a well-known manner. Or, the raising rope could pass rst on one side and then on the other side oi both l5 strands I and` I5 at successive slats. If desired,- one ofthe strands I4, I5 of each pair of ladderv strands could extend along thetop of a 1blind yslat while the otherone is underneath in supporting position. Although only one 'ladder web and 2o one end of each blind slat is shown, it will be `understood that-the usual operative construction employs two ladder-webs, one at each end of the blind slats.

As is clearly illustrated in Fig. 5, the vertical. or main webs II and I2 are respectively mainly' formed oi knitted strands I9 and 2li.l By referring to the lower left-hand portion of Fig. 5 it will be seen that the ladder-strand I4 travels upwardly in interlaced relation with the knitted l strand I9 and then extends across transversely beneath the lowest slat I6 and then joins in, in interlaced relation', with the knitted strand'2ll of the main web I2 extending upward until it reaches a proper position for v the second slat I6, whereupon it extends across as one of the ladder-strands supporting the. second slat I6, and then again becomes interlaced with the knitted strand I9 of the main web II and extends upwardly in interlaced relation therewith yuntil it 40 reaches proper positionA to extend across again as part of the next ladder support I3 for the next blind slat I6.

Similarly, by referring to the lowerright-hand corner of Fig. 5 it will be seen that the other ladder-strand I5 extends upward in interlaced` relation with the knitted strand 20 of the main web I2- until itA reaches a proper position whereupon it extends across as one of the ladderstrands of the ladder I3 supporting one end of the lower slat I6, and then extends upward in interlaced relation with the knitted strand I9 .of the main web II until it reaches a proper position, whereupon it crosses as one ofthe ladderstrands and extends upwardly in interlaced relation with the knittedstrand 20 of the main web trated in Fig. 6. the ladder-web Illa includes the ilrst and second or front and rear main webs I la and I2a with ladders I3a. The main webs Ila and I2a are respectively formed oi knitted strands Isa and a with a ladder I3a interconnecting these main-webs IIa and I2a. AThe essential difference between the construction illustrated in Fig. 6 from that illustrated in Fig. 5 resides in the fact that the ladder I 3a of Fig. 6 diiers from the ladder I 3 of Fig. 5 in that the ladder I la is formed of a single strand instead of two separate strands as in the case ofthe ladder I3 of Fig. 5. Thus the ladder I3a is formed by a single ladder-strand 2I which is interlaced with the knitted strands `Zi'ia of the main web I2a until it reaches a proper position for the rst ladder whereupon.it crosses over to the main web Ila and ,is anchored with the main web IIa and thereupon immediately returns to thus complete the formation oi' the lower ladder I3a formed of two ladder portions vof the strand 2I, as shown in Fig. 6. Thereupon .the returning portion of the ladder strand 2I is for ' iii-until it reaches the proper ladder position the next slat i6. v l In the modified form of the invention illusexample. in Fig. 8 the main web IIc is shown as formed by knitting two strands I8c'. The entire ladder-web can be made ofa'ny suitable flexible strand material such, for example, as strands of cotton or other textile material, and can be knitted upon various knitting machines known to the art such, for example, as a knitting loom similar to the old knitting loom known as the Raschel Knitting Machine, or a knitting 'loom made by 'the New England Butt Company, of Providence,

vRhode Island, or by the Cidega Corporation, of

New York city, or by the Eppler Machine Company, of Philadelphia.

Ladder-web made in accordance with the pres- -ent invention employs a minimum of textile mafront web II is arranged in back-and-forth loops and then again. returns to the main 'web I-2a to thus form the second -ladder `i3d.. whereupon it is again interlaced with the knittedstrand 20a of the main web I2a and travels upward preparatoryto similarly forming another ladder i311'.

The modified construction illustrated in Fig.

7 is similar to that illustrated in Fig, 6, diilering therefrom mainly in the mode of forming the ladders. Thus referring to Fig. 7 the ladderweb Iilb includes the irst and second main webs I Ib and I2b, each respectively formed of a knitted vstrand I9b and 20h. Each ladder I3b is formed of a single strand 22. Thus referring to the lower right end of Fig. 7, the ladder-strand 22 extends upwardly in interlaced relation with the lower end portion of the knitted strand 20h of the main web I2b until it reaches proper position to form the iirst ladder I3b, whereupon it crosses over to the main web I Ib whereupon lt is interlaced with the knitted strand I9b of the mainvweb III?, and then extends upwardly in interlaced relation with the knitted. strand I9b until it reaches the position to form the second ladder I3b whereupon it crosses over and then extends upwardly in interlaced relation with the knitted strand 20h of the main web I2b, and so on. In using this construction in a Venetian blind,`the raising rope would pass first on one side and 'then on the otherside of the ladderstrand 22 at successive slats.

In Figs. 5, 6 and 7 which illustrate the knitted construction in an opened-up'or loosened condition for clearness, the portions of the ladderstrands which are interlaced or interwoven with the knitted strands are illustrated in a fairly straight condition, although in the actual knitted construction, the knitted loops will be fairly tight and the portions of ladder-strands interlaced therewith will bend more or less sharply back and forth as they extend through the knitted loops.

This invention contemplates forming each of the main webs of one or more knitted strands and interconnecting .the main webs with one or more ladder-strands to form the ladders. ThusJ for 23v in front of, and not between, the slats I6 'with the general plane of the loops approximately parallel to the general plane of the adjacent or front edges of the slats I6. 'I'hus it will be seen that there is nothing between the slats except the ladder-strands, with the result that the slats IB can` close very close together, and in their fully closed condition the folded loops 23 will actually slide past one another into overlapped relationto some extent, but will not change their general position as shown in Fig. 3.

'In a similar way, the rear main web will form loops, the general plane of which is approximately parallel to the general plane of the adjacent or rear edges of the slats I6, without getting between the slats. Thus it win be seen that the slats of a Venetian blind employing my improved ladder-web can be closed very tightly together with minimum waste of space between the slats when in completely closed position. Also, inasmuch as the main webs do not interpose themselves between the slats, and stick out beyond the edge of the slats both in front and vrear of the slats, as is usual in the regular flat laddertape of commerce, my improved ladder-web does not rub against windows and thus become dirty on the edge portions which rub against the windows, as is true inthe case of the usual wide fiat-band ladder-tape when Venetian' blindsl employing it are set in the window frame and somewhat close to the window, as is frequently done.

Also, due to the small size ofthe main webs of my improved ladder-web, they permit the passage through the slats of the blind when opened.

of an increased amount of air and light, and the main webs collect less dust, and show stains and discolorations to a less degree than the usual aarden 1. A ladder-web for use with blind-slats to form a Venetian blind comprising: rst and second cord-like main webs each mainly formed of one or more knitted strands; and ladders formed of strands interconnecting said cord-like main webs; and each said cord-likemain web, when the blind-slats on which said ladder-web is used .are closed together, being adapted to arrange itself in back-and-forth loops the vgeneral plane of tending along and interlaced with the second cord-like main web, .of a length-section of the ladder-web, and then said ladderstrands extending oppositely to one another across between the cord-like main webs to form a ladder, and then therst ladder-strand extending along and interlaced with the second cord-like main web and which is approximately parallel tothe general plane of the edges of the blind-slats which ar adjacent to said cord-like main web.

2. A ladder-web `for use with blind-slats to form a Venetian blind comprising: first and second cord-like main Vwebs each mainly formed of one or more 'knitted strands; `and one or more ond cord-like main webs each mainly formed of one or more knitted strands; and one or more strands each extending along and interlaced with at least portions of at least one of said cord-like main webs and also forming laddersinterconnecting said cord-like main webs; and each said cord-like main web, when the blind-slats on which said ladder-web is used are closed together, being adapted to arrange itself in back-andforth loops the general plane of which is approximately parallel to the general `plane of the edges of the blind-slats which are adiacent to said cord-likegnain web.

4. A ladder-web forv use with blind-slats to form a Venetian blind comprising: iirst and second cord-like main webs each mainly formed of one or more knitted strands; and first and second.ladderstrands, the first ladder-strand extending along the first cord-like main web and the second ladder-strand extending along the second cord-like main web, of a length-section of the ladder-web, and then said ladder-strands extending oppositely to one another vacross between the cord-like Amain webs to form a ladder, and then the first ladderstrand extending along the second cord-like main web and the second ladder-strand extending along the first cord-like main web, of the next length-section of the ladder-web, and then said ladder-strands extending opposltely to one another across between the cord-like main webs to form another ladder; and each said cord-like main web, when the blind-slats on which said ladder-web is used are closed together, being adapted to arrange itself in back-and-forth loops the general plane of which is approximately parlike main web and the second ladder-strand exthe second ladder-strand extending along and interlaced with the first cord-like main web, of

the next length-section of the ladder-Web, and

then said ladder-strands extending oppositely to one another across, between the cord-like main A webs to form another ladder; and each said cordlike main web, when the blind-slats on which said ladder-web is used'are closed together, being adapted to arrange itself in back-and-forth loops the general plane of which is approximately parallel to the general pl-ane of the edges of the blind-slats which are adjacent to said cord-like main web.

6. A ladder-web for use with blind-slats to form -a Venetian blind comprising: first and second cord-like main webs each mainly formed of one or more knitted strands; and a ladder-strand extending along the first cord-like main web of a length-section of the ladder-web, and then extending across and connecting with thesecond cord-like main web and then extending back to the first cord-like main web to form a ladder, and then extending along the first cord-like main web of the next lengthesectionof ladder-web; and

edges of the .blind-slats which are adjacent to said cord-like main web.-

"I. A ladder-Webfor use with blind-slats to form a Venetian blind comprising: flrst'and second cord-like main Webs each mainly formed of one or more knitted strands; and a ladder-strand extending along and interlaced with the first cordlike main web of a length-section of the ladderweb, and then extending across and connecting with the second cord-like main web and then extending back to the first cord-like main web to form a ladder, and then extending along and interlaced with the first cord-likemain web of the next length-section of ladder-web; and each said cord-like main web, when the blind-slats on which said ladder-web is used are closed together, being adapted to arrange itself in back-andforth loops the general plane of which is approximately parallel to the general plane of the edges of the blind-slats which are adjacent to said cord-like main web.

v 8. A ladder-web for use with blind-slats to form a Venetian -blind comprising: first and second cord-like main webs each mainly formed of one or more knitted'strands; and a ladder-strand extending along the first cord-like main web of a length-section of the ladder-web, 'and then extending across between the cord-like main webs to form a ladder, and then extending along the second cord-like main web of another'lengthsection of the ladder-web, and then extending across between the cord-like main websl to form 'another ladder; and each said cord-like main web, when the blind-slats on which said ladderweb is used areclosed together, being adapted to arranged itself in back-and-forth loops the general plane of which is approximately parallel to 9. A ladder-web for use' with blind-slats to form.

a. Venetian blind comprising: first and second cord-like main webs each mainly formed of one or more knitted strands; and a ladder-strand extending along and interlaced with the rst cordlike main 'web of a length-section of the ladderweb, and then extending across between the cord-like main webs to form a ladder, and then extending along and interlaced with the second core-like main web of another length-section ot 10

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