Patent ID: 8235430

Claim:
A vent stop comprising: a housing and a tumbler, said tumbler having a retracted position in said housing and an extended position wherein a portion of said tumbler extends out from said housing, said tumbler being biased relative to said housing by a spring means; said housing comprising a top plate, said top plate forming a lip with at least a portion of said housing, a first sidewall and a second sidewall, each of said sidewalls being joined to and extending from said top plate; said housing comprising a front wall and a rear wall, each of said front and rear walls being joined to and extending from said top plate and also being joined to and extending from said first sidewall to said second sidewall, said front wall comprising a gripping mechanism; said gripping mechanism comprising: an arm, said arm being joined to and extending from a portion of said front wall being distal from said top plate, and a vertical retaining block being joined to and protruding from said top plate and also being joined to said arm, said gripping mechanism further comprising a protruding hook member, said protruding hook member being joined to and extending from said joint between said arm and said vertical retaining block, said protruding hook member being generally flexible in a direction toward and away from said top plate; said rear wall comprising a protruding arm, said protruding arm being joined to and protruding from a portion of said rear wall being distal from said top plate and terminating in and angled end surface, said protruding arm being generally flexible in a direction parallel to said top plate; and wherein when said vent stop is inserted into a recess in a sash window assembly, a portion of said sash extends between said lip of said top plate and said protruding hook member of said gripping mechanism; and a portion of said sash extends between said lip of said top plate and said protruding arm.