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Adjustable copyholder with articulated arms

  • US 4,682,749 A
  • Filed: 12/10/1985
  • Issued: 07/28/1987
  • Est. Priority Date: 10/11/1984
  • Status: Expired due to Fees
First Claim
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1. In an adjustable copyholder for writing, drafting and display, comprising a base, a cantilever arm having a plurality of cantilever arm segments and said arm attached to said base, a copy support plate mounted at a free end of said cantilever arm furthest removed from an end attached to said base, wherein said cantilever arm segments are pivotable about each other, and said copy support plate is pivotable on said cantilever arm, the pivotability of said cantilever arm segments and said copy support plate being controlled by a plurality of manually adjustable pivot joints each having a securing mechanism associated therewith, at least one handle which acts by means of at least one intermediate member on a plurality of said securing mechanisms, and is mounted at least in the vicinity of said copy support plate, wherein said intermediate members and said securing mechanisms are positioned inside of said cantilever arm segments, and at least one traction line, which crosses a central axis of one of said pivot joints and provided as one of said intermediate members, the improvement wherein said pivot joints of said cantilever arm have pivot axes which are substantially horizontal, and parallel to each other and at least one of said securing mechanisms has at least one arc-segmental brake shoe coaxial with a respective pivot axis, in each of said pivot joints at least one pivot joint passage oriented coaxially to said pivot axis is provided in a first part of one of said pivot joints for extension of said cantilever arm, in which at least one nearly circular, enclosed one of said arc-segmental brake shoes is mounted so as to be spreadable against the tension of an arc-segmental brake shoe spring, wherein said arc-segmental brake shoe is formed as an interrupted ring with a gap between the opposing ends of said arc-segmental brake shoe, said arc-segmental brake shoe by means of a spreading member held in a second part of said one of said pivot joints for extension of said cantilever arm, and engaged between opposing ends of said arc-segmental brake shoe, is united for locking engagement with said second part of said pivot joint, and contacts the surfaces of said pivot joint passage at least with frictional contact, said spreading member being mounted pivotable on a rotational axis parallel to said pivot axes, said rotational axis being positioned between said arc-segmental brake shoe ends facing each other, further said spreading member having an oval shape, wherein the small diameter of said spreading member is generally equal to the distance between said opposing ends of said arc-segmental brake shoe facing each other in said arc-segmental brake shoe when released, while the larger diameter of said spreading member is generally greater than the distance between said opposing ends of said arc-segmental brake shoe when said arc-segmental brake shoe under tension contacts the radially interior sides of said pivot joint passage, a spring member being provided for pivoting said spreading member into a locked position and said traction line being connected to release said arc-segmental brake shoe upon operation by said handle, and that all of said traction lines forming said intermediate members are operable by means of a common one of said handles.

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