Patent ID: 6968646

Claim:
A substantially zero clearance clamping pivot shoe for a window, said pivot shoe comprising a top and a bottom, camming members having camming elements having leading edges, said camming members having disposed there-between a first and a second track clamping elements each having braking surfaces engageable with a track portion disposed and riding between said track clamping elements in use, said first and second track clamping elements each having camming surfaces engageable with the camming elements, one of said first and second track clamping elements including track engaging parts and the other of said first and second track clamping elements including track supporting glide posts integrally formed therewith for enabling the shoe to glide unclamped yet supported by the track portion when the window is not pivoted, a top of the posts extending above a top of said braking surfaces of the other of said first and second clamping elements until the window is pivoted, wherein when the window is pivoted the leading edges of the camming elements of the camming members override the camming surfaces of the clamping elements thereby causing the braking surfaces of the clamping elements to immediately move toward one another for clamping down on the track portion and preventing pivotal movement of the window, wherein one of the camming elements includes a substantially v-shaped camming surface which engages said camming surfaces disposed within the clamping element which form a substantially v-shaped camming pocket, and the other of the camming elements includes trapezoidal shaped camming surfaces which engage with said camming surfaces of the second clamping element which form compatibly shaped camming recesses to provide the clamping action.