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A cantilever arm assembly and its associated structure for modular furniture systems, such as laboratory and office furniture systems, in which such cantilever support arms may be connected to slotted standards at selected elevations to support worktops, cabinet units, shelving, and the like. Each a

A cantilever arm assembly and its associated structure for modular furniture systems, such as laboratory and office furniture systems, in which such cantilever support arms may be connected to slotted standards at selected elevations to support worktops, cabinet units, shelving, and the like. Each arm is rigidly joined to a vertically-elongated mounting member equipped at its upper end with a series of hooks receivable in the slots of the standard. At its lower end, the mounting member is equipped with a locking element movable between extended and retracted positions and, when extended, projects into one of the slots of the standard to secure the mounting member against upward movement that might result in unintentional unlatching of the hooks. In addition, the locking element, when extended, causes slight pivotal movement of the mounting member to force hooks of the vertical series into tight wedging engagement with the slotted standard as well as to adjust the support arm into level condition.

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In combination with a standard having a multiplicity of uniformly-spaced slots arranged in a vertical series along at least one side thereof, a cantilever arm assembly comprising a generally horizontal support arm and a vertically-elongated mounting member secured to said support arm and having an u

In combination with a standard having a multiplicity of uniformly-spaced slots arranged in a vertical series along at least one side thereof, a cantilever arm assembly comprising a generally horizontal support arm and a vertically-elongated mounting member secured to said support arm and having an upper end portion provided with a vertical series of outwardly and downwardly projecting hooks, said hooks being received in slots of said standard for latching engagement therewith and being disengagable from said standard by first lifting said mounting member and then moving said hooks outwardly from said slots, said vertically-elongated mounting member having a major proportion of its vertical length disposed below said series of hooks anad terminating in a lower end portion spaced above the bottom of said standard, and positive locking means provided at said lower end portion of said mounting member, said locking means being shiftable between a locking position, in which said means enters one of said slots for blocking upward movement of said mounting member and thereby preventing unlatching of said hooks, and a releasing position wherein said means is retracted from said slot and permits upward unlatching movement of said hooks, means whereby said hooks being are slightly loosely received in said slots when said locking means is in its releasing position, said locking means being forceably engagable with said standard to urge the lower end portion of said mounting member in a direction away from said standard and thereby force the uppermost and lower-most hooks of said series into tighter frictional engagement with said standard.