# US 4,394,888 A · Bridging bar attachment means for bi-elevational platform lift > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,888 A - Document ID: US4394888A - Status: Granted - Kind: A - Application number: 06/270,995 - Filed: 1981-06-05 - Granted: 1983-07-26 - Earliest claimed: 1981-06-05 - Assignees: Advance Lifts, Inc. - Inventors: David E. Clarke - Web page: https://patentgrep.com/patent/US4394888A ## CPC - B66F 7/065: {Scissor linkages, i.e. X-configuration} - B65G 69/2811: {pivoting ramps} - B66F 7/28: Constructional details, e.g. end stops, pivoting supporting members, sliding runners adjustable to load dimensions - B66F: HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD ({invalid lifting devices A61G7/10; } mounting artificial islands on piles or like supports E02B17/00; scaffolding combined with lifting devices E04G1/22; lifting devices for sliding forms E04G11/24; lifting of buildings E04G23/06; shores or struts E04G25/00; lifts or other hoisting devices on ladders E06C7/12; props for mining E21D15/00) - B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D) ## Abstract Extendable bridging bar frame members are pivotally mounted to an angularly adjustable loading platform level of a bi-elevational platform lift apparatus. The bridging bar frame members are selectively extendable to engage an associated dock side loading surface in order to suspend a free end non-attached portion of the loading platform at dock side level while the opposite end portion of the loading platform is adjusted for alignment with a vertically offset dock side. This will allow angular adjustment of the loading platform level while still utilizing the mechanical support of the bridging bar frame members. ## Claims ### Claim 1 Bridging bar attachment means for use with bi-elevational platform lifts having a platform member which is pivotally attached on one end portion thereof and the opposite end portion thereof being free for angular movement to present desired angular positions of the platform member including in combination post means connectible to the platform level approximate to the free end portion thereof and extending upwardly generally perpendicularly therefrom to a predetermined height, bridging bar frame means being pivotally connected to the post means and extending generally perpendicularly therefrom to define a free end portion thereof, the briding bar frame means including on the free end portion thereof generally rounded and protruding shoulder means having a rounded contact surface thereon, the bridging bar frame means being pivotal with respect to the post means to be selectively positioned in a first extended position extending outwardly from the free end portion of the platform member, first restraining means for restraining the bridging bar frame means against movement with respect to the post means with the bridging bar frame means in the first extended position thereof, the bridging bar frame means alternatively being selectively positioned in a second and non-extending position with respect to the platform member, and second restraining means for restraining the bridging bar frame means against movement with respect to the post means with the bridging bar frame means in the second non-extended position whereby with the bridging bar frame means extended from the platform member, the bridging bar frame means are useful to suspend the free end portion of the platform member from an adjacently spaced vertically offset loading level. ### Claim 2 (depends on 1) The bridging bar attachment means in claim 1 wherein the post means include an aperture extending therethrough, and the first restraining means comprises insertable pin means to be extended through the aperture of the post means for restraining movement of the bridging bar frame means with respect to the post means. ### Claim 3 (depends on 1) The bridging bar attachment means of claim 1 wherein the post means include circumferential retaining ring means approximate to the distal extended free end portion thereof, the ring means comprises the second restraining means for restraining movement of the bridging bar frame means with respect to the post means with the bridging bar frame means positioned in the non-extended position thereof with respect to the platform member. ### Claim 4 (depends on 1) The bridging bar attachment means of claim 1 wherein the bridging bar frame means comprise a generally elongated extension frame member of tubular construction and including on one end portion thereof vertically aligned apertures through which to receive the post means for providing the pivotal connection therebetween. ### Claim 5 (depends on 4) The bridging bar attachment means of claim 4 wherein the extension frame member engages the platform member along a predetermined portion of the elongated length of the frame member and is restrained by the first restraining means to maintain the engagement therebetween with the extension frame member positioned in the first extended position thereof with respect to the platform member. ### Claim 6 Bridging bar attachment means for use in combination with a vertically adjustable scissor-acting dock lift having a raised platform loading level which is free on one end portion thereof to be separated from the supporting frame structure, comprised in combination of a post member attachable to the platform loading level generally along the free end portion thereof and extending perpendicularly therefrom, a generally elongated bridging bar frame member pivotally connected to the post member on one end portion thereof and extending perpendicularly with respect thereto to define a free end portion of said bridging bar frame member, first restraining means for restraining the bridging bar frame member against pivotal movements with respect to the post member with the bridging bar in a first position extended outwardly from the platform loading level, second restraining means for restraining the bridging bar frame member from being disconnected from the post member with the bridging bar in a second position of non-extension from the platform loading level, and the free end portion of the bridging bar frame member including rounded and protruded surface means for engaging an associated adjacent loading level and maintaining uniform surface contact therewith during movement of the platform loading level with the bridging bar frame member restrained in the first position thereof.