Device having a plate with multiple cooperating moving parts injection molded thereon

An apparatus including a rack and pinion, said apparatus comprising:

• a metallic carrier plate having opposing faces and including a first opening and an elongate slot in said plate;
• a toothed pinion having a regular distribution of teeth about is periphery and rotatable in said first opening;
• and
• a toothed rack slidable in said slot;
• said toothed pinion and toothed rack each comprising a connection bridge extending through the respective one of said opening and slot in said plate and a pair of opposing retaining pieces each overlying a respective face plate, said retaining pieces being spaced from said opposing plate faces for non-removably retaining said pinion and rack in said opening and slot, respectively, and such that said pinion and rack are freely movable within said opening and slot said, connection bridge and retaining pieces being comprised of an integrally molded synthetic resin material,
• said opening and said slot being shaped such that said toothed pinion and toothed rack are moveable between a clearance position, in which said rack and pinion have physical clearance with each other, and an operating position in which the teeth of said pinion engage the teeth of said rack to slide said rack in said slot upon rotation of said pinion.