Abstract:
A positioning device for the multi-section slide track assembly includes an inner slide track, an intermediate slide track, and an outer slide track. The positioning device consists of a positioning member and an actuating member pivot-connected thereto. The positioning member provides with at least one engaging end while the actuating member providing with at least one bent guiding edge and a push button. The engaging end is adapted to engage with an oblique protrusion of the outer slide track for positioning the intermediate slide track. A return movement of the inner slide track can actuate the bent guiding edge for automatically unlocking the engagement of the intermediate slide track with the outer slide track. Alternatively, a user can manually press the push button to unlock the engagement of the intermediate slide track with the outer slide track.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a positioning device for a multi-section slide track assembly of drawers. More particularly, the present invention relates to the positioning device for an intermediate slide track that can unlock an engagement of an outer slide track by manually operating a push button or actuating a return movement of an inner slide track.  
         [0003]     2. Description of the Related Art  
         [0004]     Referring initially to  FIG. 12 , applicant&#39;s own U.S. Pat. No. 6,585,335 discloses a three-section slide track for a drawer. The three-section slide track includes an outer slide track (A 1 ), an intermediate slide track (A 2 ) and an inner slide track (A 3 ). The inner slide track (A 3 ) and the intermediate slide track (A 2 ) are nested in the outer slide track (A 1 ) for stowing purpose. The intermediate slide track (A 2 ) is provided with a positioning plate (A 24 ) and a movable plate (A 25 ), wherein the positioning plate (A 24 ) and the movable plate (A 25 ) are stacked each other to constitute a combination unit. The position plate (A 24 ) employs a connecting member (A 23 ) adapted to connect the combination unit of the positioning plate (A 24 ) and the movable plate (A 25 ) to the intermediate slide track (A 2 ). Accordingly, the movable plate (A 25 ) is able to move along a gap extending between the positioning plate (A 24 ) and the intermediate slide track (A 2 ). The position plate (A 24 ) has a desired degree of flexibility and includes at least one positioning leg (A 241 ) and at least one locking hole (A 242 ). Correspondingly, the outer slide track (A 1 ) includes at least one locking hole (A 14 ) adapted to receive the positioning leg (A 241 ) of the position plate (A 24 ). The movable plate (A 25 ) is a V-shaped member provided with at least one lug (A 251 ) at its first end and at least one oblique protruded wing (A 252 ) at its second end. The lug (A 251 ) of the movable plate (A 25 ) inserts into the locking hole (A 242 ) of the position plate (A 24 ) for confining purpose so that a longitudinally-sliding movement of the movable plate (A 25 ) with respect to the position plate (A 24 ) is limited. Meanwhile, the oblique protruded wing (A 252 ) proximate the second end of the movable plate (A 25 ) can be pressed by an end of the inner slide track (A 3 ) while operating. Thus, the lug (A 251 ) proximate the first end of the movable plate (A 25 ) is relatively lifted with respect to a horizontal plane of the intermediate slide track (A 2 ).  
         [0005]     In extending operation, after the intermediate slide track (A 2 ) is drawn out a predetermined distance relative to the outer slide track (A 1 ), the positioning leg (A 241 ) of the position plate (A 24 ) is engaged with the locking hole (A 14 ) of the outer slide track (A 1 ). Consequently, the intermediate slide track (A 2 ) is positioned at a predetermined position with respect to the outer slide track (A 1 ).  
         [0006]     In retracting operation, when the inner slide track (A 3 ) is retracted a predetermined distance into the intermediate slide track (A 2 ), an end of the inner slide track (A 3 ) presses the oblique protruded wing (A 252 ) of the movable plate (A 25 ). Synchronously, the lug (A 251 ) at the first end of the movable plate (A 25 ) is relatively lifted with respect to a horizontal plane of the intermediate slide track (A 2 ) to detach the positioning leg (A 241 ) from the locking hole (A 14 ) of the outer slide track (A 1 ). Consequently, the disengagement of the intermediate slide track (A 2 ) from the outer slide track (A 1 ) is carried out for retracting purpose.  
         [0007]     In assembling process, the movable plate (A 25 ) is easily taken apart and mis-aligned with the position plate (A 24 ) that increases on elements of the entire structure and sophisticates the entire manufacturing process.  
         [0008]     Once the intermediate slide track (A 2 ) releases the inner slide track (A 3 ), the intermediate slide track (A 2 ) extends beyond the outer slide track (A 1 ) that may damage the operator by accident. To avoid causing the damage, the intermediate slide track (A 2 ) must be manually stowed into the outer slide track (A 1 ). However, it is inconvenient for manually operating the movable plate (A 25 ) since the movable plate (A 25 ) is sandwiched between the position plate (A 24 ) and the intermediate slide track (A 2 ). Moreover, it is also inconvenient for manually operating the movable plate (A 25 ) due to lack of a push button.  
         [0009]     The present invention intends to provide a positioning device for a multi-section slide track assembly of drawers, components of a computer system for example. The positioning device consists of a positioning member and an actuating member pivot-connected thereto. The actuating member allows a manual operation for unlocking an engagement of an intermediate slide track in such a way to mitigate and overcome the above problem.  
       SUMMARY OF THE INVENTION  
       [0010]     The primary objective of this invention is to provide a positioning device for a multi-section slide track assembly of drawers, components of a computer system for example, which consists of a positioning member and an actuating member pivot-connected thereto. The actuating member allows a manual operation for unlocking an engagement of an intermediate slide track with an outer slide track, thereby simplifying the unlocking operation of the multi-section slide track assembly.  
         [0011]     The secondary objective of this invention is to provide the positioning device for the multi-section slide track assembly of drawers, which consists of a positioning member and an actuating member pivot-connected thereto. The actuating member allows employing a return movement of an inner slide track for automatically unlocking an engagement of an intermediate slide track with an outer slide track, thereby facilitating the auto-unlocking operation of the multi-section slide track assembly.  
         [0012]     The multi-section slide track assembly of drawers in accordance with the present invention includes an inner slide track, an intermediate slide track, an outer slide track and a positioning device mounted on the intermediate slide track. The positioning device consists of a positioning member and an actuating member pivot-connected thereto. The positioning member provides with at least one engaging end while the actuating member providing with at least one bent guiding edge and a push button. The engaging end is adapted to engage with an oblique protrusion of the outer slide track for positioning the intermediate slide track. A return movement of the inner slide track can actuate the bent guiding edge for automatically unlocking an engagement of the intermediate slide track with the outer slide track. Alternatively, a user can manually press the push button to unlock the engagement of the intermediate slide track with the outer slide track.  
         [0013]     In design choice, the positioning device further employs a guiding member mounted in the intermediate slide track for guiding an end of the inner slide track.  
         [0014]     Other objectives, advantages and novel features of the invention will become more apparent from the following detailed description and the accompanying drawings. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0015]     The present invention will now be described in detail with reference to the accompanying drawings wherein:  
         [0016]      FIG. 1  is an exploded perspective view of a positioning device for a multi-section slide track assembly of drawers in accordance with a first embodiment of the present invention;  
         [0017]      FIG. 2  is an assembled perspective view of the positioning device for the multi-section slide track assembly of the drawers in accordance with the first embodiment of the present invention;  
         [0018]      FIG. 3  is a lateral view of the positioning device for the multi-section slide track assembly of the drawers in accordance with the first embodiment of the present invention in extending operation;  
         [0019]      FIG. 4  is a lateral view of the positioning device for the multi-positioning device for the multi-section slide track assembly of the drawers in accordance with the first embodiment of the present invention in a first step of retracting operation;  
         [0020]      FIG. 5  is a lateral view, similar to that shown in  FIG. 4 , of the positioning device for the multi-section slide track assembly of the drawers in accordance with the first embodiment of the present invention in a second step of retracting operation;  
         [0021]      FIG. 6  is a lateral view, similar to that shown in  FIG. 4 , of the positioning device for the multi-section slide track assembly of the drawers in accordance with the first embodiment of the present invention in a third step of finally retracting operation;  
         [0022]      FIG. 7  is an exploded perspective view of a combination of a positioning device with a guiding member for a multi-section slide track assembly of drawers in accordance with a second embodiment of the present invention;  
         [0023]      FIG. 8  is an assembled perspective view of the combination of the positioning device with the guiding member for the multi-section slide track assembly of the drawers in accordance with the second embodiment of the present invention;  
         [0024]      FIG. 9  is a perspective view of a positioning device for a multi-section slide track assembly of drawers in accordance with a third embodiment of the present invention;  
         [0025]      FIG. 10  is a perspective view of a positioning device for a multi-section slide track assembly of drawers in accordance with a fourth embodiment of the present invention;  
         [0026]      FIG. 11  is a perspective view of an actuating member of a positioning device for a multi-section slide track assembly in accordance with a fifth embodiment of the present invention; and  
         [0027]      FIG. 12  is an exploded perspective view of a conventional position device for retaining a three-section slide track in accordance with the prior art. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0028]     Referring to  FIGS. 1 and 2 , it depicts that a three-section slide track assembly of drawers includes a positioning device in accordance with the first embodiment of the present invention. The three-section slide track assembly of drawers comprises an inner slide track  1 , an intermediate slide track  2  and an outer slide track  3 , each of which has a conventional configuration. The inner slide track  1 , the intermediate slide track  2  and the outer slide track  3  are rigid and strong to withstand normal use. In retracting (stowing) operation, the inner slide track  1  and the intermediate slide track are nested in the outer slide track  3 .  
         [0029]     To reduce the running abrasion in use, a pair of ball tracks  4  and  5  are sandwiched in between any two of the inner slide track  1 , the intermediate slide track  2  and the outer slide track  3  so as to smoothen slide movement. However, the entire structure is designed to have as low a friction characteristic as possible. In extending operation, the inner slide track  1  is able to extend a predetermined distance in a longitudinal direction with respect to the intermediate slide track  2 . Similarly, the intermediate slide track  2  is able to extend a predetermined distance in a longitudinal direction with respect to the outer slide track  3 . To avoid a careless release of the inner slide track  1 , a conventional retaining member is provided on the inner slide track  1 .  
         [0030]     Although only the retaining construction of the inner slide track  1  has been discussed, it will be appreciated that the inner slide track  1  includes known structures such as a retaining member, a stop member and the like etc.  
         [0031]     Referring again to  FIGS. 1 and 2 , the intermediate slide track  2  includes a positioning device  6  attached thereto in proper. Construction of the positioning device  6  shall be described in detail below.  
         [0032]     The intermediate slide track  2  includes a combination opening  22  for accommodating the positioning device  6 . The positioning device  6  consists of a positioning member  61  and an actuating member  62  pivot-connected thereto by pivot members  63 . The positioning member  61  is a one-piece member having a desired degree of flexibility and includes an assembling hole  611  and a pair of upright bent stops  612  at its first end. Preferably, the intermediate slide track  2  includes a fixing rod  21  press-fit in the assembling hole  611  of the positioning member  61  that mounts the positioning member  61  on the intermediate slide track  2 . In sliding operation, the upright bent stops  612  of the positioning member  61  are used to confine a relatively sliding movement of the ball rack  4  on the intermediate slide track  2 . Furthermore, the second end of the positioning member  61  includes a pair of bent teeth  613  and a pair of engaging ends  614  protruded therefrom, and wherein the engaging ends  614  are used to engage with two oblique protrusions  31  of the outer slide track  3 .  
         [0033]     The actuating member  62  is a one-piece member having a desired degree of rigid. Particularly, the actuating member  62  includes a pair of arms  621  at its first end, and a pair of bent guiding edges  622  and a push button  623  at its second end, wherein the push button  623  connected between the bent guiding edges  622 . Each of the bent guiding edges  622  is adapted to support either lateral edge of the inner slide track  1 .  
         [0034]     Turning now to  FIG. 3 , it depicts that three-section slide track assembly is extended. Extending operation of the three-section slide track assembly shall be described in detail.  
         [0035]     When the inner slide track  1  is drawn out a predetermined distance from the intermediate slide track  2  and the outer slide track  3 , the actuating member  62  is disengaged from the inner slide track  1 . Thus, the positioning member  61  inclines its second end to the outer slide track  3  so that the engaging ends  614  of the positioning member  61  are engaged with the two oblique protrusions  31  of the outer slide track  3 . Consequently, the intermediate slide track  2  is positioned and unable to retract into the outer slide track  3 .  
         [0036]     Turning now to  FIG. 4 , it depicts that the three-section slide track assembly is retracted in the first step. Retracting operation of the inner slide track  1  shall be described in detail.  
         [0037]     When the inner slide track  1  is initially inserted a predetermined distance into the intermediate slide track  2 , an end  11  of the inner slide track  1  presses the bent guiding edges  622  of the actuating member  62 . Synchronously, the end  11  of the inner slide track  1  may lift the connection of the arms  621  with the bent teeth  613  of the positioning device  6 . As a result, the return movement of the inner slide track  3  may disengage the bent teeth  613  of the positioning member  61  from the oblique protrusions  31  of the outer slide track  3 . Alternatively, a user can manually press the push button  623  of the actuating member  62  which can disengage the bent teeth  613  of the positioning member  61  from the oblique protrusions  31  of the outer slide track  3 .  
         [0038]     Turning now to  FIG. 5 , it depicts that the three-section slide track assembly is retracted in the second step. Retracting operation of the inner slide track  1  and the intermediate slide track  2  shall be described in detail.  
         [0039]     When the inner slide track  1  is successively inserted into the intermediate slide track  2 , the bent teeth  613  of the positioning member  61  is disengaged from the oblique protrusions  31  of the outer slide track  3 . Consequently, the intermediate slide track  2  is unlocked and allowed being pushed into the outer slide track  3 .  
         [0040]     Turning now to  FIG. 6 , it depicts that the three-section slide track assembly is completely retracted in the third step. Finally retracting operation of the inner slide track  1  and the intermediate slide track  2  shall be described in detail.  
         [0041]     Finally, the combination of the inner slide track  1  and the intermediate slide track  2  can be pushed into the outer slide track  3  without any obstruction. Consequently, the inner slide track  1  and the intermediate slide track  2  are nested in the outer slide track  3  and the three-section slide track assembly is completely retracted.  
         [0042]     Turning now to  FIGS. 7 and 8 , it depicts that a three-section slide track assembly of drawers includes a combination of a positioning device with a guiding member in accordance with the second embodiment of the present invention.  
         [0043]     As is known in the first embodiment, the positioning device  6  in accordance with the second embodiment consists of a positioning member  61  and an actuating member  62 . In comparison with the first embodiment, the positioning device  6  of the second embodiment further employs a guiding member  7  mounted in the intermediate slide track  2  for guiding the end  11  of the inner slide track  1 . In assembling operation, the intermediate slide track  2  has the combination opening  22  in which to receive the guiding member  7  which is sandwiched between the positioning device  6  and the intermediate slide track  2 , as best shown in  FIG. 8 . Preferably, the intermediate slide track  2  provides with a pair of assembling grooves  23  at either end of the assembling opening  22  so that two distal ends of the guiding member  7  is mounted in the corresponding guiding grooves  23 . It can be appreciated that the combination opening  22  of the intermediate slide track  2  accommodates the combination of the positioning device  6  with the guiding member  7 . In sliding operation, the guiding member  7  can prevent any mis-alignment of the end  11  of the inner slide track  1  with respect to the intermediate slide track  2  that ensures the operation of the slide track assembly.  
         [0044]     Turning now to  FIG. 9 , it depicts that a three-section slide track assembly of drawers includes a positioning device in accordance with the third embodiment of the present invention.  
         [0045]     As is known in the first embodiment, the positioning device  6  in accordance with the third embodiment consists of a positioning member  61  and an actuating member  62 . In comparison with the first embodiment, the positioning member  61  and the actuating member  62  of the third embodiment provide with two pivots  615  and two C-shaped recessions  624 , respectively. The pivots  615  of the positioning member  61  are freely received in the C-shaped recessions  624  of the actuating member  62 .  
         [0046]     Turning now to  FIG. 10 , it depicts that a three-section slide track assembly of drawers includes a positioning device in accordance with the fourth embodiment of the present invention.  
         [0047]     As is known in the first embodiment, the positioning device  6  in accordance with the fourth embodiment consists of a positioning member  61  and an actuating member  62 . In comparison with the first embodiment, the positioning member  61  of the fourth embodiment provides with a bent extension  616  and a channel  617  thereof. Correspondingly, the actuating member  62  provides with two lugs  625  freely received in the channel  617  of the positioning member  61 .  
         [0048]     Turning now to  FIG. 11 , it depicts that a positioning member of a positioning device in accordance with the fifth embodiment of the present invention.  
         [0049]     As is known in the first embodiment, the positioning member  61  in accordance with the fifth embodiment includes a pair of arms  621 , and a pair of bent guiding edges  622  and a push button  623 . In comparison with the first embodiment, the positioning member  61  of the fifth embodiment further includes a pair of bent legs  626 . In assembling, the bent legs  626  are in contact with a surface of the intermediate slide track  2  that ensures the pivotal operation of the positioning device  6 .  
         [0050]     Although the invention has been described in detail with reference to its presently preferred embodiment, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims.