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  Safety barrier stanchionUSPTO Application #: 20070246299Title: Safety barrier stanchion Abstract: A stanchion used as part of a regulatory safety barrier around the ledge of an elevated construction slab comprises a square tubular enclosure having an open lower end and a closed upper end. A foot extends orthogonally near the lower end, and rests against the upper surface of the ledge. A clamping member telescopically engaged into the lower end of the enclosure has an arm also extending from its lower extremity and is positioned against the lower surface of the ledge. The arm is urged toward the foot in a ledge-clamping action by the turning of a threaded stem running inside the telescopically engaged enclosure and clamping member. The threaded stem has a lower end captured by a nut welded inside the clamping member. The upper end of the stem protrudes through a hole in the closed end of the enclosure and is fitted with a wing-nut and a hex-nut so that the stem can be turned either by hand or by means of a wrench. (end of abstract)
Agent: Charmasson, Buchaca & Leach, LLP - San Diego, CA, US Inventors: James E. Wright, Brian Quinn USPTO Applicaton #: 20070246299 - Class: 182113000 (USPTO) Related Patent Categories: Fire Escape, Ladder, Or Scaffold, Safety Device, Platform Associated, Railing The Patent Description & Claims data below is from USPTO Patent Application 20070246299. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] This invention relates to hand rails, barriers and fences and more particularly to regulatory safety barriers which must be temporarily installed during construction of an edifice around the ledge of scaffolding or an elevated floor slab. BACKGROUND [0002] When working on elevated scaffolds, platforms or floor slabs, construction workers and tradesmen are exposed to the hazard of falling off their work areas. The Occupational Safety & Health Administration of the U.S. Department of Labor has issued regulations requiring that any person working on such a structure more than 3.1 meters (10 feet) above the lower level be protected from falling to that lower level by a fall arrest or guard rail system meeting certain prescribed specifications. The prior art offers a variety of stanchions that can be clamped around the ledge of a platform or floor slab. A number of such stanchions spaced apart along a ledge can support joining studs or cables to form the required safety barrier. The clamping of each stanchion is accomplished by a vise-like structure that relies on the manual strength of the installer manipulating a clamping handle. However, temperature changes and other weather conditions can cause variations in the size and dimensions of materials used in the fabrication of the stanchions or the platform or slabs upon which they are attached. Any resulting loosening of the clamping force applied by the stanchion on the working surface can compromise the safety of the barrier. [0003] The instant invention results from an attempt to improve the long term stability of safety barrier stanchions. SUMMARY [0004] The present invention provides a lightweight but sturdy stanchion that can be used to form a safety barrier along the ledge of an elevated platform, scaffold or floor slab by providing an improved clamping action around a ledge backed by reinforcing spike or nails. The stanchion comprises a square stock tubular enclosure having at its lower end an arm that can be rested on the top surface of the ledge and secured thereon by a spike driven through a hole in the arm and into the ledge itself. A foot member is telescopically engaged in the open lower end of the stanchion. The clamping member has a foot that projects orthogonally under and against the lower surface of the ledge. The clamping member is urged upwardly by a threaded stem engaging a threaded section in the upper region of the clamping member and having an upper section protruding through the closed top section of the stanchion where it engages a handle and hex-nut. Turning of the handle causes the clamping member to translate telescopically up and down within the stanchion. The hex-nut provides for tightly clamping of the device by use of a standard wrench in addition to bare hand manipulation of the handle. Loop brackets at spaced apart locations along the stanchion allow for the passage therethrough of standard size construction studs or cables in order to form a hand rail and a knee high barrier. The lowest rung of studs is located closely to the top surface of the platform or slab and acts as a convenient stop for any object that might roll or be inadvertently pushed off the ledge at the risk of injuring personnel working below. [0005] In some embodiments there is provided a safety barrier stanchion securable to a floor slab ledge, which comprises: a tubular enclosure having a closed first end and an opposite open second end; a foot member projecting orthogonally from a side of said enclosure proximal said second end; at least one bracket projecting orthogonally from said side in the same angular direction as said foot member; a tubular clamping member having a first extremity telescopically engaged into said second end; an arm projecting orthogonally proximal a second end of said clamping member; said clamping member having a threaded inner section; a threaded stem having a first end section engaged into said threaded inner section and an opposite end section protruding through an aperture in said closed end; a handle capping said protruding section; and said handle being secured to said protruding section by a removable diametrical pin; whereby turning of said handle causes said clamping member to telescopically translate within said enclosure. [0006] In some embodiments said foot member has at least one hole axially parallel to said tubular enclosure. [0007] In some embodiments said bracket is U-shaped and has a median portion and the two leg portions secured to said enclosure side. [0008] In some embodiments said bracket has a hole in said median section. [0009] In some embodiments said handle includes a hexagonal part axially aligned with said threaded stem and suitable for engagement by a standard size wrench. [0010] In some embodiments said threaded inner section comprises a nut fixedly secured within said clamping member. [0011] In some embodiments the stanchion further comprises a first ring barrier coaxially and fixedly mounted on said threaded stem inside said enclosure proximal said closed end. [0012] In some embodiments the stanchion further comprises a second ring barrier coaxially and fixedly mounted on said threaded stem first end section beyond said clamping member threaded section. [0013] In some embodiments the stanchion further comprises three of said brackets, a first of said brackets located proximal to said foot member, a second bracket located in a median section of said enclosure, and a third of said brackets located proximal said closed end. [0014] In some embodiments one of the leg portion of said first bracket is welded to said arm. [0015] In some embodiments there is provided a safety barrier mounted on the ledge of an elevated concrete slab which comprises: a plurality of the stanchions secured to said ledge at spaced apart intervals; each of said stanchions clamping said ledge between said arm and the foot of said clamping member; a first elongated member engaged into the first bracket of at least two of said stanchions; an elongated member engaged into the second bracket of at least two of said stanchions; a third elongated member engaged into a third bracket of at least two of said stanchions; and a pin driven through the hole in the foot member of each of said stanchion and into said slab. [0016] In some embodiments said elongated members comprise at least one construction stud. [0017] In some embodiments said elongated members comprise at least one cable. BRIEF DESCRIPTION OF THE DRAWING [0018] FIG. 1 is a perspective view of a stanchion according to the invention; [0019] FIG. 2 is an enlarged cross-sectional view of the stanchion clamping mechanism; [0020] FIG. 3 is a perspective view of a safety barrier using a plurality of stanchions; and Continue reading... Full patent description for Safety barrier stanchion Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Safety barrier stanchion patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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