Патент USA US2115796код для вставки
May 3, 1938.' y' G. K. BRADFIELD, JR 2,115,796 LOCKING MECHANISM FOR VENETIAN BLINDS ` Filed Jan. 6, 1957 mí f e_ _ Èhm Geary INVENTOR Zell, J7.' @a ATTO R N EY 2,115,796 Patented May 3, 1938 „ UNITED sTXA'r-‘Es PA'riiN'rI 4ol-"I-‘lclaz' 2.115.196 LOCKING MECHÀNISM FOR’VENETIAN . - BLIND George K. Bradiìeld,.Jr., Hackensack, N. J., Is signor to American Car and Foundry Com pany, New York, N. Y., a. corporation of New Jersey Application January 6, 1937, Serial No. 119,228 8 Claims. (C1. 156-17 ) This invention relates to Venetian blinds in roller I2 which, as previously mentioned' is jour general and in particular to locking means for n‘aled on pin 8. The portion of the blind just the operating cords of the Venetian blinds. described is of conventional and well known con Previous operating means for Venetian blinds struction and operation. If desired, pulleys I2 and 5 have been extremely cumbersome and not posi 26 may be made as a single unit, or in other l 5 I tive in their locking action, the more common words, a double pulley. form of operating means consisting merely „of 'I'he improved locking means disclosed herein the lift cords which in order to hold the blind consists of an operating arm having side pieces must be wrapped around the locking projection, 30 joined together at one extremity by cross mem 10 fastened to the window frame. Other types of ber 32, while the otherRextremityI 86 is pierced 10» semi-automatic cord fastening means have been and pivotaily mounted upon pulley supporting provided but this required a deñnite operation on pin 8. The`side portions of this operating. arm the part of the operator before the cord would are also joined by means of intermediate plate like portion 38 having a downwardly and inwardly .be locked. Itis an object, therefore, of this in 15 vention to provide a cord locking means which is fully automatic. ' ` Another object of the invention is the provi directed end> portion _40 terminating in a dog 15 'actuating portion in the form of a rounded'lip 42. Adjacent this lip portion the side pieces are.- sion of a cord locking means which will retain the ~ `pierced and provided with an elongated slot 44 curved substantially concentric with the pin _8 and adapted to permit movement of the'arms relative to a pin 46 supported by the side mem vision of a spring actuated locking means which „ bers. The operating arm just described may be positively grips the cord at all times unless ten > formed inlany desired manner, such as pressing, sion is applied to the loose or operating end. casting or welding together of. various plates as blinds in any position without requiring a con-` ‘20. sciou's eiîort on the part of the operator. A further object of the invention is the pro This as well as other objects of the invention is obvious. ’ , Ü Pivotally mounted upon supporting pin 46 by will be apparent to those skilled in the .art from a study of the following description and accom? ~ spaced ears or lugs 48 is a locking dog having an panying drawing, in which: upwardly directed cord-engaging lip 50 and a downwardly directed web portion 52 terminat ing in a ñange 54 adapted to be engaged by the 30 previously mentioned operating lip 42. Flat spring 56 has one end portion 58 resting on the Figure l is a sectional view of an upper portion 30 of the blind with the improved locking mechanism applied; \ Fig. 2 is a plan view of a portion of the blind, and , cross bar 6 and an intermediate portion 60 resting upon the supporting pin 46 between the spaced ears 48 of the locking dog, while the other end ‘ 62 of the spring engages the flat intermediate portion of the operating arm. It is thus seen shown which are necessary for an understanding that the spring constantly urges the operating of the invention. The blind is of conventional arm upwardly but that the locking dog is free 40 form having top side pieces 2 and 4 joined together 40 to rotate slightly on the supporting pin 46. at intervals by means such _as straps 6 and theseIn order to provide a surface against which side pieces carry the pins 8 and I0 on which the the cords may be bound a cord guide or housing cord supporting pulleys I2 and I4 respectively are member has been provided having side portions 45 journaled. Attached«to these side pieces by clips 64. joined together by a web or top portionfß'ß. I6 (only one of which is shown) is the top bar This guide or housing member is arranged adja I8 to which is attached the customary web straps cent the side pieces and is mounted upon fixed 2U supporting and positioning the slats 22. The pins 8 and 46, thereby being immovably positioned. operating cord 23, which if desiredmay be con- . The cords passing over pulleys I2- and 26 will 50 tinuous, has one end attached as at 24 to the always lie closely adjacent the web portion 66 bottom slat, while theintermediate portions of` and extend therefrom outwardly past guide lip the cord pass over supporting pulley I4 and an 68 formed on said -housing member, to a double idler pulley 26 journaled on the pin 8. The other pulley 18 which is journaled on pin ‘I2 supported Fig. 3 is a sectional view similar to Figure 1 35 but showing the mechanism in released position. Referring now to the drawing in detail, it is seen that only portions of the blind have been end of the cord 23 is attached as at 28`to the lower 55 bar or slat and extends upwardly over supporting ` byfthe side pieces of the operating arm adjacent cross piece 32. The cords, after passingover this 55 `2 2,115,700 - double pulley, are directed downwardly and their tain the maar in cord wedglng relation. a pulley1 free or operating end ‘ll will hang free adjacent - carried by the arm for supporting the cord, said the window casing or trim. pulley being so arranged that tension exerted on ._ . said cord will shift the arm to release the dog The operation o_f the' device is as follows: As from its wedglng relation with the cord, and re suming the mechanism to bein the normal posi tion shown in Fig. 1, the operator desiring to silient means acting against said arm to constant either raise or lower the slats merely grips the ly urge the dog into cord wedglng position. 4. Locking means for a supporting cord of a cord ends 18' and applies tension thereto which will lower the operating arm to the position-shown Venetian blind comprising a iixed element adja cent which the cord passes, a locking dog movable 10 in Fig. 3 causing lip I2 to move downwardly to wedge-the cord against the ñxed element, an 10 away from flange 5l of the locking dog. During this operation a slight shift in the cord will have ' operating arm for .moving said dog into~ cord taken place freeing the lip 50 of the locking dog wedglng position, said dog being journaled adia from the cord, and permitting the dog to drop cent the cord on a shaft passing through said arm. to the position shown in Fig. 3. With the parts said arm being so formed and arranged as to be 15 in the position as shown in Fig. 3 the slats may movable relative to said shaft and having cord be raised or lowered as desired by the operator supporting means remote from the dog whereby tension applied on the free end of the cord will , and immediately upon release of tension on the free ends 18 of the cords, the spring 56 will lift release said locking dog. and resilient means op the operating arm causing lip “to rotate the erable upon release of the tension to shift the op operating'dog upwardly into such a position that erating arm to move the dog into cord wedglng _ lip 50 is forced into engagementwith »the cord position. 5. Locking means for a supporting cord of-a thus stopping any further movement of the cord. It is ‘to be noted that the cord engaging lipîiû ,. Venetian blind comprising a fixed element adja cent which the cord passes, a locking-dog having 25 will always be to one side of the supporting pin spaced ears journaled adjacent the cord and mov 46 thus causing a tightening of the dog upon the cord due to the weight of the slats. It is able to wedge the cord against the fixed element, an operating arm for moving said dog into cord also to'be noted that to lock the cord requires no wedglng position, said arm being so formed and conscious effort on the part of the operator since arranged with relation to said dog as to pass he 3.0 a mere'release of the tension in the cord, whether -this be intentional or accidental, will cause an immediate locking of the cord retaining the slats in position. l - While the device has been described in more 35 or less detail, it is obvious that various modifica tions and rearrangement of parts will suggest themselves to persons skilled in the art, but such modifications and rearrangements are contem plated as fall within the scope of the following - claims. What is claimed is: 1. Locking means for a supporting cord oi.' a tween the ears thereof, and resilient means con stantly urging said operating arm into the dog moving position to retain the cord in wedged position.A ~ 6. Locking means for a supporting cord of a Venetian blind comprising a fixed element adia cent which the -cord passes, a loclçing dog mov able to wedge the cord against the' fixed element, and an operating arm for releasing said dog from cord wedglng position, said dog being journaled -adjacent the cord and bridging said arm, said arm supporting thecord at a point remote from the dog and being so formed and arranged with relation to said dog as to be automatically op erable upon application of a pull on the cord to -Venetian `blind comprising, a fixed element ad jacent which the cord passes, a locking- dog jour naled adjacent the cord and movable to wedge release said dog. the cord against the fixed element, an operating 7. Locking means for a supporting cord, of a arm for moving said dog into cordwedging posi Venetian blind comprising a fixed element adja tion, said arm having cord supporting means . cent which the cord passes, a locking dog movable remote from the dog and b_eing so formed and ar to wedge the cord against the fixed element, an ranged'that tension applied on the free end of the operating arm for» releasing said dog from cord cord will release said locking dog, and resilient wedging position, said dog being journaled adja means operable upon release of the tension to cent the cord on a shaft passing through said shift the operating arm to move the dog into cord arm, said arm being so formed and arranged as wedglng position. ' to be movable relative to said shaft and support 2. Looking means for the supporting cords of ing a portion voi? the cord and -being automatically 55 a Venetian blind comprising, a fixed housing operable upon application of a pull on the cord through which the cords project, a -locking dog - to release said dog, and resilient means automat journaled within the housing and -adapted to ically operable to move said arm and dog into wedge the cord against the housing, cord support cord wedglng position upon release of the cord. ing means j‘ournaled on a shaft extending through 8. Locking means for the supporting cord of a the housing, an operating arrn pivoted on said Venetian blind comprising a ñxed housing shaft, a pulley carried by said arm providing a through which the cord projects, a locking dog' support for a portion of the cord, means on said arm engageable with said dog to move the same 65 into cord engaging position, and resilient means constantly urging said operating arm toward dog operating position. ‘ 3..Locking means for the supporting cord of a. Venetian blind comprising, a fixed cord guide, journaled on a shaft in said housing and movable -to wedge the cord against the housing, and an 65 operating arm for moving said dog into cord wedging position, said arm being formed with a slot through which said shaft f passes and being automatically operable upon release of tension in the free end of the cord to move said dog to 70 70 a locking dog adapted to wedge the cord against ` cord wedging position. - said guide, a pivotally mounted operating arm having means engaging said dog to normally're-GEORGE K. BRADFIELD, JR.