公开(公告)号：US4089085A

公开(公告)日：1978-05-16

申请号：US781976

申请日：1977-03-28

Applicant: Jack R. Fitzgibbon

Inventor： Jack R. Fitzgibbon

IPC: E05F1/10 ,  E05F1/16 ,  E05D17/00

CPC classification number: E05D13/1207 ,  E05Y2201/67 ,  E05Y2900/148 ,  Y10T16/64 ,  Y10T16/706 ,  Y10T16/714

Abstract: An improved window sash balance and components thereof. The balance includes a spring fixed with respect to the frame and a pair of pulley blocks, each containing one or more pulleys. One block is fixed with respect to the frame and the other is disposed on the end of the spring. A cord is secured to one pulley block and trained over the pulleys. The other end of the cord terminates in a hook adapted to be received in an opening in the window jamb channel. The pulley block unit includes a pulley-receiving frame, one, two or three pulleys received therein, and at least one axle for rotatably supporting the pulleys within the frame. The block has one or two pulley-receiving openings therein, and suitable openings for reception and positioning of the axle. The block includes first and second pairs of assembly reference surfaces forming a part of the block and spaced radially from the axle opening. The axle-receiving opening in the pulley and in the block each include outwardly tapering guide or pilot surfaces and the axle includes one or two inwardly tapering pilot surfaces. The size of the pulley and the positioning of the reference surfaces are arranged so that when an outer edge of the pulley is in coplanar alignment with the reference surface, the tapering margins on the axle and the pulley will engage and serve to align the pulley as the axles are positioned in the block.

Abstract translation: 改进的窗扇平衡及其部件。 平衡包括相对于框架固定的弹簧和一对滑轮块，每个滑轮块包含一个或多个滑轮。 一个框架相对于框架固定，另一个块设置在弹簧的端部。 绳索被固定到一个滑轮块并在皮带轮上训练。 绳的另一端终止于适于容纳在窗口通道中的开口中的钩子。 皮带轮单元包括滑轮接收框架，一个，两个或三个皮带轮，其中容纳在其中，以及至少一个轴，用于将框架内的滑轮可旋转地支撑。 该块在其中具有一个或两个滑轮接收开口，以及用于轴的接收和定位的合适的开口。 该块包括形成块的一部分并与轴开口径向间隔开的第一对和第二对组合参考表面。 滑轮和滑块中的轴接收开口各自包括向外渐缩的导向或导向面，并且该轴包括一个或两个向内渐缩的导向面。 滑轮的尺寸和参考表面的定位被布置成使得当滑轮的外边缘与参考表面共面对准时，轴和滑轮上的锥形边缘将接合并用于将滑轮对准 轴位于块中。