Guided slide assembly

1. A guided slide assembly comprising:

at least one sliding rail unit having a first slide rail having a longitudinal base plate, a pair of guide plates extending respectively and transversely from two opposite sides of said base plate, and at least one securing portion formed on one of said guide plates, each of said guide plates contacting and covering a plurality of balls that roll thereon, said securing portion being a slit hook formed in said one of said guide plates by a pressing process; and

at least one longitudinal guiding unit detachably disposed on said one of said guide plates, and having a longitudinal rack member and at least one engaging hook disposed on said rack member, said engaging hook engaging said securing portion on said one of said guide plates, said longitudinal rack member being formed with a longitudinal toothed portion and an aperture, said toothed portion having a plurality of longitudinally spaced-apart teeth, each of said teeth having a tip and a root, said aperture extending through a gap between said roots of two adjacent said teeth, said engaging hook projecting oppositely of said tip from one of said roots of said two adjacent said teeth, said engaging hook having a barb surface that is aligned with said aperture and that is spaced apart from said roots;

wherein said longitudinal rack member further includes two spaced-apart longitudinal retaining walls, a longitudinal recess and at least two side retaining elements, said toothed portion bridging said retaining walls, said longitudinal recess being confined by said retaining walls and a back side of said toothed portion opposite to tips of said teeth, said engaging hook extending into said longitudinal recess, said side retaining elements being respectively disposed on two opposite sides of said engaging hook.

2. The guided slide assembly as claimed in claim 1 , wherein said toothed portion further has at least one abutting member, said abutting member being spaced apart from said engaging hook and facing an open end of said engaging hook.

3. The guided slide assembly as claimed in claim 1 , further comprising a slotted part disposed at one end of said rack member.

4. A guided slide assembly comprising:

at least one sliding rail unit having a first slide rail having a longitudinal base plate, a pair of guide plates extending respectively and transversely from two opposite sides of said base plate, and at least one securing portion formed on one of said guide plates, each of said guide plates contacting and covering a plurality of balls that roll thereon, said securing portion being a slit hook formed in said one of said guide plates by a pressing process;

at least one longitudinal guiding unit detachably disposed on said one of said guide plates, and having a longitudinal rack member and at least one engaging hook disposed on said rack member, said engaging hook engaging said securing portion on said one of said guide plates, said longitudinal rack member being formed with a longitudinal toothed portion and an aperture, said toothed portion having a plurality of longitudinally spaced-apart teeth, each of said teeth having a tip and a root, said aperture extending through a gap between said roots of two adjacent said teeth, said engaging hook projecting oppositely of said tip from one of said roots of said two adjacent said teeth, said engaging hook having a barb surface that is aligned with said aperture and that is spaced apart from said roots; and

at least two side retaining elements formed on said rack member, said side retaining elements respectively extending on two opposite sides of said engaging hook.

5. The guided slide assembly as claimed in claim 4 , wherein said toothed portion further has at least one abutting member, said abutting member being spaced apart from said engaging hook and facing an open end of said engaging hook.

6. The guided slide assembly as claimed in claim 4 , wherein said guiding unit further has a slotted part disposed at one end of said rack member.