US1951528A - Pull-cord lock - Google Patents

Description

March 20, 1934. A. PEARsoN PULL CORD LOCK Filed July 14, 1933 n mvENToR:

Any/o fffmso/v, BY Mm,

/'s ATTORNEY.

Patented Mar. 20, 1934 UNITED STATES PATENT OFFICE 7 Claims.

This invention relates to lock or stop devices for pull-cords, particularly for pull-cords of Venetian blinds, shades and the like, and has for its main object to provide a device of the mentioned character which will be simple in construction, inexpensive to manufacture and to apply, and eicient in operation and use.

Another object of this invention is to provide a device of the type mentioned wherein the stopping or locking action on the pull-cord will be automatic, but it will be easy to release by a sideway pull or movement of the cord itself, while the locking action may be just as easily and quickly restored by moving the operating end of the cord itself in the reverse, central direction so that the release of the locking action, as well as the restoring of the same into operation, will be done by manipulating the operating portion of the cord itself.

Still a further object of this invention is to provide a device as characterized hereinbefore, in which the locking action will be automatically increased by the normal pull of the weight of the blind, shade, or the like, itself.

Still further objects of this invention will be apparent as the specification of the same proceeds.

With such objects in view, my invention mainly consists in providing an inclined plane over which the pull-cord will pass in my device. A roller, ball, or the like will cooperate with said inclined plane normally being in engagement ,with the cord and locking the same by its friction with said inclined plane and with the cord with a surface provided for reaction, and arranged above the cord so that the pull on said roller element by the cord will have the tendency to move said roller upwardly on the plane and to increase its locking effect. A first rocking lever device is also arranged in connection with my invention, acting on the roller, and a second lever device acting on said rst lever and being acted upon by the operating portion of the pull-cord itself, so that when said portion of the pull-cord is moved away from the center line of the portion of the cord passing through my locking device, said second lever will be disengaged from said f'lrst lever and said first lever will permit the roller to move downwardly on said inclined plane and free the pullcord, thereby permitting the same to move in either direction.

In the drawing forming a part of the specification and accompanying the same:

Fig. 1 is a partly sectional side elevation of my assembled device indicated in a diagrammatic manner in its application to two pull-cords of a Venetian blind or the like;

Fig. 2 is an elevation at right angle to that of Fig. 1, of my device, portions of the same having been removed for the sake of clearness of showing, the full line positions of said levers in the Figs. 1 and 2 being different for the sake of clearness;

Fig. 3 is a partly sectional plan view of the inclined plane employed in my device and its associated parts;

Fig. 4 is a fragmentary sectional elevation of the inclined plane and some associated parts, the section being taken on the line 4 4 of Fig. 3.

Fig. 5 is a detailed showing of the first mentioned rocking lever in plan view, while Fig. 6 is a fragmentary side elevation of the same;

Fig. 7 is a plan view of the mentioned second rocking lever, shown in Figs. 1 and 2.

Referring now to the drawing more closely, by characters of reference, the numeral l0 indicates my device in general having two main portions, a supporting bracket 11 and a housing 12, with the various parts of my device arranged therein.

Bracket 11 has a vertical branch 13 and a horizontal branch 14, and my device will be secured through that bracket by any appropriate means to a portion of the window, like the head casing or head board of a Venetian blind, or any other element on which my stopping device is to be used and to be hidden therein. The element to which my device is secured is not shown on the drawing, but in Fig. 1, I indicate two pullcords 15 and 16 to which my device is applied, said pull-cords being led through appropriate pulleys 17 and 18 and so turned into horizontal side by side relation, whereupon they will enter my device at its left hand open end 19 and leave it at the right hand open end 20, the cords being guided and their direction being changed in the device through a third pulley 21. The casing 12 is of a reversed channel shape having a left hand side 22, right'hand side 23 and top 24, the bottom of the same being formed by the horizontal branch 14 of the bracket l1 and the same being secured on said branch 14 as by the riveted tongues 25 adjacent to the left hand end 19 of the casing. Inclined plate 26 is secured across the casing 12 to a certain distance towards the center thereof, said plate having the tongues or projections 27 (Figs. 1 and 3), by which it is secured into the walls 22 and 23 of the casing, while the inner end thereof is supported by a pin'28 also secured into said side walls. Inwardly of said pin 28 the further portion of said plate 26 is turned upa bracket to secure the same on an element in a window, or the like, to which the pull-cord is applied; a channel shaped housing secured on said bracket open at both ends, the cord to be locked passing through said housing; an inclined piane in said housing, underneath the cord; a bottom extension for said inclined plane; a roller normally i'reely resting in said extension and being out of engagement with said cord; a lever rockably arranged between the walls of said housing:

an extension on said lever adapted to engage said roller, and means to operate said lever from the outside whereby the rocking of said lever will cause said extension to engage said roller and raise it upwardly on said plane and into engagement with said cord, an upward riding of said

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