US 191088

Patent Overview — US 191,088

Title: Improvement in Skylight Lifter and Lock

Patentee: John F. Wollensak, of Chicago, Cook County, Illinois

Dates: Application filed April 23, 1877; patent granted and published May 22, 1877. The source lists the term as expired, with an anticipated expiration date of May 22, 1894.

Assignee: None stated in the supplied text.

Purpose: To provide the public an improved means for conveniently raising, lowering, and locking skylights and other horizontal or inclined windows and doors (source, "Definitions" and Description).

Plain-language scope: The device uses a fixed vertical guide-bar (B), preferably metal and dovetailed, on which a block (O) slides freely. A spring lock-bolt (g) attached to the block engages holes in the bar, locking the sash open, closed, or at intermediate positions. One or more rods (h h) articulate the block to the hinged top sash (a). A grooved pulley (d) in a bracket (e) at the top of the bar guides a cord (f) attached at both ends to the block and passing through an eye in the bolt. Pulling the cord backward disengages the bolt; continued downward pulling raises or lowers the sash, which then locks automatically by spring force. The bight may hang at m n, or two independent cords may be used. The skylight cannot be opened from above but can be operated from any floor below. Only a slender cord is needed beneath the dome. Where the sash is heavy enough, the lower cord attachment to the block may be omitted, letting gravity lower it. Three claims cover: (1) the sliding block with spring bolt combined with guide-bar, rod(s), and operating cord(s); (2) the cord with spring bolt and sliding block, such that pulling backward disengages the bolt and continued pulling raises the sash; (3) the pulley with the guide-bar, cord, and block (cord passing down through the bolt).

Source: https://patents.google.com/patent/[US191088](/patent/US191088)/en

What the excerpt does not establish: It does not establish any assignee, ownership transfer, litigation, license, or validity determination. The source's "Cited By," "Similar Documents," "Classifications," and "Family" listings are bibliographic only; the excerpt contains no analysis of those references and no legal conclusion about the patent's coverage or enforceability.