Crib with two tier height adjustment linkage mechanism

A crib comprising:

• two opposite end frame members;
• two opposite drop side members connected with and between said two end frame members;
• mattress support means for supporting a mattress between said end frame members and said side members, said mattress support means including a first substantially rectangular frame and a second substantially rectangular frame situated side by side between said end frame members and said side members, each said frame including two opposite end bars and interconnecting support bars, each said end bar having an outer end and an inner end, with said inner ends of said end bars being adjacent to each other;
• and
• pivoting linkage means for pivotally supporting said mattress support means from said end frame members such that said mattress support means is capable of assuming only a lower stable supporting position and a raised stable supporting position.

A crib comprising:

• two opposite end frame members;
• two opposite drop side members connected with and between said two end frame members;
• mattress support means for supporting a mattress between said end frame members and said side members, said mattress support means including a substantially rectangular frame positioned between said end frame members and said side members, said frame including two opposite end bars and first and second opposite side bars interconnected with said end bars, each said end bar having a first end adjacent said first side bar and a second, opposite end adjacent said second side bar;
• and
• pivoting linkage means for pivotally supporting said mattress support means from said end frame members such that said mattress support means is capable of assuming only a lower stable supporting position and a raised stable supporting position, said pivoting linkage means including:
• two linkage bars, each having a first end pivotally connected to a respective said end bar of said frame at a position spaced inwardly of said first end thereof,
• first and second pivoting support bar means for pivotally supporting second, opposite ends of said linkage bars to said end frame members, respectively, and
• third and fourth pivoting support bar means for pivotally supporting said second ends of said end bars to said end frame members, respectively.

A crib comprising:

• two opposite end frame members;
• two opposite drop side members connected with and between said two end frame members;
• and
• mattress support means for supporting a mattress between said end frame members and said side members, said mattress support means being connected to said end frame members, said mattress support means including a first substantially rectangular frame and a second substantially rectangular frame situated side by side between said end frame members and said side members, each said frame including two opposite end bars and interconnecting support bars, each end bar having an outer end and an inner end, with said inner ends of said end bars being adjacent to each other;
• and
• pivoting linkage means for pivotally supporting said mattress support means from said end frame members such that said mattress support means is capable of assuming only a lower stable supporting position and a raised stable supporting position, said pivoting linkage means including:
• two inverted U-shaped channel means for pivotally interconnecting said adjacent inner ends of said end bars together,
• connecting rod means for fixedly connecting together said channel means, and
• pivoting support bar means for pivotally supporting the outer ends of said end bars to said end frame members.