Closure gate apparatus having material flow guiding structure

Claim 2

Gate apparatus for selectively opening and closing a material flow aperture, comprising: closure means for a material flow aperture; first means connected to said closure means and selectively operative to move said closure means either to a first position substantially aligned with such aperture or to a second position laterally displaced from such aperture; second means interconnected between said closure means and said first means and responsive to further operation of said first means after attainment of said first position by said closure means to dispose said closure means in closure relation with such material flow aperture; and said second means being operative in response to initial movement of said first means in a direction away from said first position to withdraw said closure means from said closure relation.

Claim 3

Gate apparatus as in claim 1, wherein: said second means includes track means mounted in laterally extending relation to such aperture; support means disposed for movement along said track means and connected to support said closure in said withdrawn position; and said track means having a region which is engageable by said support means to move said closure means toward said closure relation.

Claim 4

Gate apparatus for selectively opening and closing a material flow aperture, comprising: closure means for a material flow aperture; first means connected to said closure means and selectively operative to move said closure means either to a first position substantially aligned with such aperture or to a second position laterally displaced from such aperture; second means connected to said closure means and responsive to further movement of said first means upon attainment of said first position by said closure means to dispose said closure means in closure relation with such aperture; said second means being responsive to initial movement of said first means away from said first position to withdraw said closure means from said closure relation; said second means including track means mounted in laterally extending relation to such aperture; support means disposed for movement along said track means and operative to support said closure in said withdrawn position; and said track means having a region which is engageable by said support means to move said closure means toward said closure relation with said aperture when said first means is moved to said first position.

Claim 5

Gate apparatus for selectively opening and closing a material flow aperture, comprising: closure means for a material flow aperture; first means connected to said closure means and selectively operative to move said closure means either to a first position substantially aligned with such aperture or to a second position laterally displaced from such aperture; second means connected to said closure means and responsive to further movement of said first means upon attainment of said first position by said closure means to dispose said closure means in closure relation with such aperture; said second means being responsive to initial movement of said first means away from said first position to withdraw said closure means from said closure relation; said second means including track means mounted in laterally extending relation to such aperture; support means disposed for movement along said track means and operative to support said closure in said withdrawn position; and said track means having a region which is engageable by said support means to move said closure means toward said closure relation with said aperture when said first means is moved to said first position.

Claim 6

Gate apparatus as in claim 3, wherein said region comprises a discontinuity in said track means.

Claim 7

Gate apparatus as in claim 3, wherein: said second means further includes a crank operatively interconnected between said first means and said second means to provide positive withdrawal of said closure means from closure relation with such aperture in response to initial movement of said first means away from said first position.

Claim 8

Gate apparatus as in claim 3, further comprising: material flow guide means operatively associated with said first means for movement into flow guiding relation with such aperture when said closure means is moved to said second position and for movement away from such aperture in response to movement of said closure means toward said first position.

Claim 9

Gate apparatus as in claim 6, wherein said flow guide means is supported by said track means for movement therealong in response to said first means.

Claim 10

Gate apparatus for selective closure of an opening, comprising: closure means configured to obstruct such opening; first means supporting said closure means for lateral movement with respect to such opening, said closure means being supported for lateral movement between a first position in alignment with such opening and a second position in laterally spaced apart relation to such opening; motive means operatively connected to selectively urge said closure means either to said first position or to said second position; second means operatively interconnected between said motive means and said closure means and operative in response to said urging away from said first position to withdraw said closure means from opening obstruction relation before said closure means is moved away from said first position, and additionally operative to return said closure means to opening obstruction relation when said closure means is moved to said first position.

Claim 11

Gate apparatus for selective closure of an opening, comprising: closure means configured to obstruct such opening; first means supporting said closure means for lateral movement with respect to such opening, said closure means being supported for lateral movement between a first position in alignment with such opening and a second position in laterally spaced apart relation to such opening; motive means operatively connected to selectively urge said closure means either to said first position or to said second position; second means operatively interconnected between said motive means and said closure means and operative in response to said urging away from said first position to withdraw said closure means from opening obstruction relation before said closure means is moved away from said first position, and additionally operative to return said closure means to opening obstruction relation when said closure means is moved to said first position.

Claim 12

Apparatus for selectively closing a flow opening, comprising: a pair of support members flanking such opening and extending to a location laterally spaced apart from the opening; carriage means supported by said support members for selective reciprocating movement between a first position in proximate relation to such opening and a second position laterally spaced apart from such opening; closure means carried by said carriage means for movement between said first position in proximate confronting alignment with such opening and said second position laterally spaced apart from the opening; motive means connected to move said carriage means selectively to either of said first and second positions; and said closure means being connected to said carriage means by further means responsive to further operation of said motive means after said carriage means becomes moved to said first position to urge said closure means into closure relation with such opening, and responsive to said motive means urging said carriage away from said first position to withdraw said closure means from said closure relation before said carriage means moves away from said first position.

Claim 13

Apparatus for selectively closing a flow opening, comprising: a pair of support members flanking such opening and extending to a location laterally spaced apart from the opening; carriage means supported by said support members for selective reciprocating movement between a first position in proximate relation to such opening and a second position laterally spaced apart from such opening; closure means carried by said carriage means for movement between said first position in proximate confronting alignment with such opening and said second position laterally spaced apart from the opening; motive means connected to move said carriage means selectively to either of said first and second positions; and said closure means being connected to said carriage means by further means responsive to further operation of said motive means after said carriage means becomes moved to said first position to urge said closure means into closure relation with such opening, and responsive to said motive means urging said carriage away from said first position to withdraw said closure means from said closure relation before said carriage means moves away from said first position.

Claim 14

Apparatus as in claim 9, wherein: said further means comprises means operative to maintain said closure means in said withdrawn position in response to displacement of said carriage means away from said first position.