Silding track structure

Abstract

A sliding track structure includes an inner track, a middle track, an outer track, an inner ball bearing member, an outer ball bearing member, and a separation mechanism. The inner track is slidably joined with the middle track in conjunction with the inner ball bearing member. The outer track is slidably joined with the middle track in conjunction with the outer ball bearing member. The separation mechanism is disposed at a front end of the middle track to facilitate the separating of the outer track from the middle track.

What is claimed is:  
     
         1 . A sliding track structure comprising: 
 a middle track having an H-shaped cross section, comprising a horizontal plate, and two vertical plates fastened respectively at two sides of said horizontal plate;    an inner track adapted to be fastened with a table, bureau, vanity, or the like;    an outer track adapted to be fastened with a drawer of the table, bureau, vanity, or the like;    an inner ball bearing member mounted on one side of said two vertical plates of said middle track to enable said inner track to slide along a longitudinal direction of said middle track on said one side thereof; and    an outer ball bearing member mounted on other side of said two vertical plates of said middle track to enable said outer track to slide along the longitudinal direction of said middle track on said other side thereof; wherein 
 said outer track is provided at one end with an arresting piece to prevent separation of said outer ball bearing member from the one end of said outer track;  
 said outer ball bearing member is provided with a folded portion close to said horizontal plate of said middle track for preventing said outer ball bearing member from separating from said middle track, wherein said folded portion;  
 wherein said horizontal plate of said middle track is provided with a separation mechanism which is able to be switched between a locking position and an unlocking position; when said separation mechanism is in said locking position, it will be in contact with a front end of said folded portion of said outer ball bearing member at the time when said outer track is slid along the longitudinal direction of said middle track toward a front end of said middle track, so that the outer track together with the outer ball bearing member are retained with the middle track; when said separation mechanism is in the unlocking position, said folded portion of said outer ball bearing member will move past said separation mechanism at the time when said outer track is slid along the longitudinal direction of said middle track toward the front end of said middle track, so that said outer track and said outer ball bearing member are separated from said middle track.  
   
     
     
         2 . The sliding track structure as defined in  claim 1 , wherein said separation mechanism comprises a sliding member having a stop portion and a sliding portion, said sliding member being received in a receiving hole on the horizontal plate and at the front end of said middle track such that said stop portion is jutted out of said receiving hole to be contiguous to said outer track, and further that said sliding portion is contiguous to said horizontal plate of said middle track, when said separation mechanism is in said locking position, wherein said stop portion is adapted to be in contact with said front end of said folded portion of said outer ball bearing member; and still further that said stop portion is not jutted out of said receiving hole, when said separation mechanism is in said unlocking position, wherein said stop portion is not able to be in contact with said front end of said folded portion of said outer ball bearing member.  
     
     
         3 . The sliding track structure as defined in  claim 2 , wherein said sliding member comprises a cube as said stop portion and a tongue extending from said cube, wherein said cube is partially jutted out of said receiving hole to be contiguous to said outer track, and said tongue is contiguous to said inner track, when said separation mechanism is in said locking position.  
     
     
         4 . The sliding track structure as defined in  claim 2 , wherein said sliding member comprises a cube acting as said stop portion, and two inclined slots located in two opposite sides of said cube to act as said sliding portion; wherein said separation mechanism further comprises two inclined pillars located at two opposite sides of said receiving hole of said horizontal plate of said middle track, and said two inclined pillars are received in said two inclined slots.  
     
     
         5 . The sliding track structure as defined in  claim 3 , wherein said sliding member comprises a cube acting as said stop portion, and two inclined slots located in two opposite sides of said cube to act as said sliding portion; wherein said separation mechanism further comprises two inclined pillars located at two opposite sides of said receiving hole of said horizontal plate of said middle track, and said two inclined pillars are received in said two inclined slots.  
     
     
         6 . The sliding track structure as defined in  claim 4 , wherein said separation mechanism further comprises a carrying seat which is fastened with the front end of said horizontal plate of said middle track and is provided with a rectangular hole serving as said receiving hole, with said rectangular hole being equal in width to said cube and being greater in length to said cube; wherein said two inclined pillars are located in two opposite sides of said rectangular hole of said carrying seat.  
     
     
         7 . The sliding track structure as defined in  claim 5 , wherein said separation mechanism further comprises a carrying seat which is fastened with the front end of said horizontal plate of said middle track and is provided with a rectangular hole serving as said receiving hole, with said rectangular hole being equal in width to said cube and being greater in length to said cube; wherein said two inclined pillars are located in two opposite sides of said rectangular hole of said carrying seat.  
     
     
         8 . The sliding track structure as defined in  claim 6 , wherein said horizontal plate of said middle track is provided at the front end thereof with a rectangular fastening hole corresponding to said carrying seat; wherein said carrying seat is provided in the fringe with an insertion slot for fitting three side edges of said rectangular fastening hole; wherein said horizontal plate of said middle track is provided with a pliable confinement piece at the remaining side edges of said rectangular fastening hole for confining said carrying seat in said fastening hole.  
     
     
         9 . The sliding track structure as defined in  claim 7 , wherein said horizontal plate of said middle track is provided at the front end thereof with a rectangular fastening hole corresponding to said carrying seat; wherein said carrying seat is provided in the fringe with an insertion slot for fitting three side edges of said rectangular fastening hole; wherein said horizontal plate of said middle track is provided with a pliable confinement piece at the remaining side edges of said rectangular fastening hole for confining said carrying seat in said fastening hole.  
     
     
         10 . The sliding track structure as defined in  claim 1 , wherein said separation mechanism comprises a pivoting member, and a carrying seat which is fastened with the horizontal plate and at the front end of said middle track, said pivoting member comprising a stop portion and a tongue, said pivoting member being fastened pivotally with said carrying seat such that said tongue is jutted out of one side of the horizontal plate of said middle track, and that said stop portion is jutted out of other side of the horizontal plate of said middle track, and further that said stop portion is contiguous to said outer track, when said separation mechanism is in said locking position, wherein said stop portion is adapted to be in contact with said front end of said folded portion of said outer ball bearing member; and still further that said stop portion of said pivoting member is turned to said one side of the horizontal plate of said middle track, when said separation mechanism is in said unlocking position, wherein said stop portion is not able to be in contact with said front end of said folded portion of said outer ball bearing member.  
     
     
         11 . The sliding track structure as defined in  claim 10 , wherein said pivoting member comprises a right-angled triangular body serving as said stop portion, said tongue is extended upwardly and slantingly from a vertical side of said right-angled triangular body, and said carrying seat is provided at one end with two arms which are parallel to each other and are provided with a pivoting hole, wherein two pivots are provided on two opposite sides of said right-angled triangular body and at positions away from said vertical side of right-angled triangular body, and said pivoting member is fastened pivotally between said two arms with said two pivots being received in said pivoting holes, such that said tongue of said pivoting member is contiguous to one side of said carrying seat, and that said right-angled triangular body is exposed at other side of said carrying seat at the time when said separation is in said locking position; and said pivoting member is turned to said one side of said carrying seat, so that said right-angled triangular body is not exposed at other side of said carrying seat, when said separation mechanism is in said unlocking position