US 2010214 A
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Aug. 6, 1935. K. BRAUN COMPENSATING DEVICE FOR SASH WINDOWS AND THE LIKE Filed July 2, 1934 Patented Aug. 6, 1935 i 2,010,214 v UNITED STATES-PATENT"OFFICE COMPENSATING DEVICE FOR SASH WINDOWS AND THE LIKE Karl Braun, Augsburg, Germany Application'July 2, 1934, Serial No. 733,371 In Germany July 3, 1933 Claims. (01. 16-198) My invention relates to sash windows having and their orderly dropping into the grooves is devices for compensating the weigh t of the sash, ensured. If the shaft were disposed horizontally the cords of which, when the sash,.is raised, will the wound portions of the cord would, because be wound upon one or more spring controlled of the angle of inclination of the grooves, press 5 rollers or drums. against their flanks. In order to prevent exces- 5 According to this invention the/object of which sive friction from this cause the shaft is therefore is to ensure the sash cords being 'wound properly, according to the invention, inclined to the horithe rollers or drums are mounted rotatably upon a zontal to such an extent with regard to the pitch stationary shaft in such a manner, that during of the grooves that the cords will chafe against each revolution the rollers will travel sideways the flanks of the grooves, but will drop into the 10 a distance equal to the thickness of the cord. bottoms thereof.
Agreeably to this purpose the end of the shaft upon It is of course, within the scope of the invention which the roller rides and the bore-of the roller to provide separate compensating devices for are provided with threads engaging one with the each of the. cords 5 and 6; the grooves on the other. The rollers rotating when the sash is drum would in that case be single-threaded. But 15 raised will consequently at every rotation also a great deal of material, and also of space, is move a certain distance sideways along the shaft. saved by the embodiment just now described The drawing shows, by way of example, a pre- I since, as shown in the drawing, on the right hand ferred form of the sash window embodying the side of the window a second compe ev e invention. for a second window sash could conveniently be 20 In the drawing, I indicates the stationary shaft placed. of the compensating device which is supported What I claim is: in blocks 2 and'a attached to the window frame, 1. A comp n i vi f r sash windows and 4 indicates a drum like roller the surface of which the like, comprising a stationary shaft having a is provided with a pair of identical grooves for the threaded portion, a grooved drum rotatably 25 accommodation of the sash cords 5 and 6 from mounted on said shaft and havin a threaded which the sash is suspended. The drum 4 is of bore engaging the threads on said shaft so as to conical shape and the grooves form a double move uniformly lengthwise thereonwhile being thread thereon. The two grooves being identical rotated, and tensioning means for rotating said both sash cords 5 and 6 may be wound side by drum. 30 side on one and the same drum. For the purpose 2. A compensating device for sash windows,
- of guiding the cord 6 twoguide rollers 8 and 9 and the like, comprising a stationary shaft havare provided which are fastened to the block 2 ing a threaded portion, a grooved drum rotatably and the window frame respectively. l0 indicates mounted on said shaft and having a threaded bore a cylindrical helical tension spring, one end of engaging the threads on said shaft so as to move which is connected to the drum 4, while the uniformly lengthwise thereon while being roother end is fastened to the worm wheel ll of a ,tated, tensioning means for rotating said drum,
9 self checking worm gear. By a turn of the worm and means for adjustingsaid tensioning means.
l2 which is journalled in hearings on the block 3. A compensating device for sash Windows, and
r 40 3, the tension on the spring it] may be adjusted the like, comprising a stationary shaft inclined 40 to the exact degree necessary for compensating to the horizontal and having a threaded portion, .the weight of the sash. I3 indicates a thread on a conical grooved drum rotatably mounted on said the shaft 1 which engages with a corresponding shaft and having a threaded bore engagingthe thread in the bo e o the d um 4- I threads .on said shaft so as to move uniformly The device functions as follows: lengthwise thereon while being rotated, tension- When the sash l is raised the load on the ing means for rotating said drum, and means for sp g in is reduced, and the spring xp n g controlling said tensioning means.
to a corresponding degree will rotate the drum 4 4. A compensating device for sash windows, which will'thus be caused to travel laterally along and the like, comprising a stationary shaft inthe threaded portion of the shaft I, while the clined to the horizontal and having a threaded raising of the sash is continued. The rate of portion, a grooved conical drum rotatably mountprogress of this lateral movement is such that the ed on said shaft and having a threaded bore inproper relative position of the taking-up portions engagement with the threads on said shaft so as of the grooves on the drum to the successive porto move, uniformly lengthwise thereon while being tions of the cords 5 and G is'maintained continually rotated, and a tension spring encircling said shaft and having one end attached to said drum for rotating the same.
5. A compensating device for sash windows, and
a grooved conical drum rotatably mounted on said shaft and having a threaded bore in engagement with the threads on' said shaft so as to move uniformly lengthwise thereon while being rotated,
and a tension spring encircling said shaft and having one end attached to said drum for rotating the same, a worm-wheel on said shaft having secured thereto the other end of said tension spring, and a worm for rotating said worm-wheel to thereby control the tension of saidspring.