Patent ID: 7012675
Filing Date: 2006-03-14
Classification: G03B,Y10T

Abstract:
1. A knuckle arm adapted to be connected to a machine body and a top cover of a machine, said knuckle arm comprising: a base including a mounting plate unit adapted to be disposed fixedly on the machine body, two pivot plates connected fixedly to said mounting plate unit, two first pivot holes formed respectively through said pivot plates, and a receiving frame secured between said pivot plates, said receiving frame including a top wall, a bottom wall that is spaced apart from said top wall, and an abutment wall interconnecting said top and bottom walls fixedly to define an accommodating chamber among said top wall, said bottom wall, said abutment wall and said pivot plates; an inner sliding seat disposed movably within said accommodating chamber in said base and having a cam surface; at least one resilient member disposed within said accommodating chamber in said base and biasing said inner sliding seat to move away from said abutment wall; a first pivotable seat including two first wing plates located respectively to two opposite sides of an assembly of said pivot plates, a first connecting plate interconnecting said first wing plates fixedly, two through holes formed respectively through said first wing plates, and two apertures formed respectively through said first wing plates; a pressing rod extending through said through holes in said first pivotable seat and biased by said resilient member to contact said cam surface of said inner sliding seat; a second pivotable seat including a first pivot rod extending through said second pivot holes in said second pivotable seat and said first pivot holes in said base; and a second pivot rod extending through said curved slots in said second pivotable seat and said apertures in said first pivotable seat.