Sofa bed with front extension

Claim 1

In a multiply configurable sofa bed having a rigid articulated frame supporting first, second and third cushion supports configurable in a sofa configuration, in which said second cushion support assumes a horizontal position and said first cushion support extends downwardly therefrom to form a leg rest and said third cushion support extends upwardly from said second cushion support to form a seat and configurable in a bed configuration in which said first, second and third cushion supports are positioned in a substantially coplanar horizontal arrangement; latching support means operative upon said first cushion support comprising: first and second elongated scissor arms having a common pivotal attachment therebetween, said first scissor arm having a first end pivotally attached to said first cushion support and a second end and said second scissor arm having a first end pivotally attached to said second cushion support and a second end; a third arm having a first end pivotally attached to said first cushion support and a second end pivotally attached to said second end of said second scissor arm; a fourth arm having a first end pivotally attached to said second end of said first scissor arm and a second end pivotally attached to said second cushion support; a slide bar having a first end pivotally attached to said second scissor arm intermediate said first and second ends thereof, a second end, and first and second notches intermediate said first and second ends of said slide bar; and latch means supported by and rigidly attached to said second cushion support and including a latch rod substantially perpendicular to said slide bar and sized to be received within said first and second notches, and first and second cams pivotally attached to said slide bar proximate said first and second notches respectively, said first and second cams each being pivotable between positions obstructing said first and second notches and positions clear of said first and second notches.