| 摘要 |
<p>A mixer for mixing hot and cold water is disclosed in which a hot water valve and a cold water valve are controlled movement of respective operating rods in directions parallel to the rotary axis of a control member. The control member has mounted therein for pivoting about an axis perpendicular to the rotary axis of the control member an actuating member which supports, in a plane fixed with respect to the actuating member, a planar cam plate rotatable in its plane with respect to the actuating member. The operating rods bear via shoes on the upper planar surface of the cam plate, in which the pivotal axis of the actuating member lies, at equal distances from the point at which the plane of the cam plate intersects the rotary axis of the control member, and a vertically adjustable abutment bears on the cam plate at a position on the bisector of the angle subtended at said point of intersection by the positions at which the operating rod shoes bear on the cam plate, so that the ratio R1 R2 + R3 is substantially constant over the range of possible settings of the mixer, where R1, R2 and R3 are the respective perpendicular distances to the pivotal axis of the actuating member from the positions at which the two operating rods and said abutment respectively act on the cam plate.</p> |
