Abstract:
A dispenser for measuring and dispensing powder materials includes a slide housing having a powder inlet slot, a slide having a measure slot, and an elastic element. The slide is pressed against the slide housing by the elastic element to make the slide move relative to the slide housing. The slide moves between the first position and the second position. On the first position, the measure slot is in alignment with the powder inlet slot and the powder is filled into the measure slot; on the second position, the measure slot moves away from the powder inlet slot and the powder is discharged from the measure slot. The elastic element makes the slide press against the slide housing during moving to reduce the clearance between the slide and the slide housing, makes the slide move smoothly, and reduces the precision demand of manufacture and assembly.

Description:
BACKGROUND OF THE PRESENT INVENTION 
     1. Field of Invention 
     The present invention relates to a powder dispensing device, and more particularly to a device for measuring and dispensing powder materials. 
     2. Description of Related Arts 
     A conventional powder dispensing device generally comprises a slide and a slide housing, wherein the slide is slidably or rotatably coupled with the slide housing and is adapted to move between a first position for filling the powder material and a second position for dispensing the powder material. 
     Accordingly, all conventional powder dispensing devices have a common drawback. The slide housing must provide enough space for the slide to slide or rotate between the first and second positions. Or, the slide is pivotally coupled with the slide housing such that the slide can be pivotally moved between the first and second positions. If the slide is tightly coupled with the slide housing, i.e. the space of the slide housing is too small, the slide cannot be moved smoothly to move between the first and second positions. If the slide is loosely coupled with the slide housing, i.e. the space of the slide housing is too large, the clearance between the slide and the slide housing is large enough for the powder material to leak through the clearance. If the space of the slide housing is not even in size or the size of the slide is not symmetry, the slide cannot be moved smoothly to move between the first and second positions and the powder material will also leak at the clearance during the movement of the slide. 
     The precision requirement for assembling the slide and the slide housing is very high. In other words, when the slide is not perfectly match with the slide housing, the device cannot effectively dispense the powder material. Therefore, every single part of manufacturing in the mold and their assembling are highly required to meet a standard of precision. Moreover, the precision level of dispensing the powder material is equivalent to the precision level of measuring the powder material. According to the existing technology and its manufacturing method, the conventional device for measuring and dispensing powder materials is obviously unable for mass production to meet the current needs. 
     SUMMARY OF THE PRESENT INVENTION 
     A main object of the present invention is to provide a device for measuring and dispensing powder materials to overcome the existing problems of measuring and dispensing powder materials, wherein the present invention provides the device for effectively measuring and dispensing powder materials and enhances convenient manufacturing and assembling process of the device. 
     Accordingly, in order to accomplish the above object, the present invention provides a device for measuring and dispensing powder materials, comprising a slide housing, a slide, and an elastic unit, the slide housing having a through powder inlet slot, the slide having a measure slot. The slide is movably coupling with the slide housing at a position that the elastic unit applies an urging force at the slide to retain the slide in position. The slide is adapted to move between a first position and a second position, wherein at the first position, the measure slot of the slide is in alignment with the powder inlet slot of the slide housing for the powder materials being filled into the measure slot through the powder inlet slot, and at the second position, the measure slot of the slide is moved away from the powder inlet slot of the slide housing for discharging the powder materials from the measure slot of the slide. 
     Accordingly, the slide has a coupling side slidably engaging with the slide housing, wherein the elastic unit has an affixing end being affixed in position and an elastic free end biasing against the slide to apply the urging force thereat so as to ensure the coupling side of the slide being engaged with the slide housing. 
     The elastic unit provides the following assembling ways. The elastic unit is a separated unit supported between the slide and the slide housing to apply the urging force against the slide. Or, the elastic unit is integrally extended from the slide housing to apply the urging force against the slide. Likewise, the elastic unit can be integrally extended from the slide to apply the urging force against the slide housing. The elastic unit can be made of metal, plastic, or other elastic materials and can be an elastic piece, a compression spring, a spring clip, silica gel, foam, or other elastic materials for applying the urging force between the slide and the slide housing. 
     The slide comprises a blocking panel defining the coupling side thereat and a blocking wall extended from the blocking panel to define the measure slot within the blocking wall, wherein when the slide is moved at the second position, an outlet of the powder inlet slot is sealed by the coupling side of the blocking panel. 
     The slide housing comprises a slide body and a retention panel, wherein the powder inlet slot is a through slot provided at the slide body. The retention panel is coupled at a bottom side of the slide body and has a through hole communicating with the powder inlet slot. The slide is coupled at a bottom side of the retention panel, wherein the elastic unit has a U-shaped cross section securely clamping with the retention panel and the slide. 
     The slide is pivotally coupled with the slide housing at a bottom side thereof, wherein the slide comprises a blocking panel and a blocking wall extended therefrom. When the slide is moved at the second position, an outlet of the powder inlet slot is sealed by the blocking panel, wherein the measure slot is formed within the blocking wall. 
     The slide housing comprises an axle extended downwardly and vertically. The slide is coupled at the slide housing at a bottom side thereof, wherein the slide comprises a ring-shaped inner wall, a ring-shaped outer wall, and at least a blade radially extended from the inner wall to the outer wall to define one or more measure slots within the blade and the inner and outer walls. The slide further comprises a cover panel having a first dispensing opening and a retention panel having a second dispensing opening. The elastic unit is upwardly and inclinedly extended from the retention panel towards the cover panel. The axle of the slide housing is slidably passing through the inner wall and the cover panel to coaxially couple with the retention panel, wherein at each of the first and second positions, at least one of the measure slots is aligned with the powder inlet slot while another the measure slot is aligned with the first and second dispensing openings. 
     The slide housing has a rotating cavity and a dispensing opening, wherein an axis of the rotating cavity is set horizontally. The elastic unit is extended from a wall of the rotating cavity in a suspended manner. The slide comprises a left side panel defining the coupling side thereat, a right side panel, and a plurality of blades extended between the left and right side panels in a radial manner to define the measure slots within the blades and the left and right side panels. The slide is horizontally placed in the rotating cavity at a position that the coupling side of the left side panel is biased against the slide housing while the right side panel is biased against the elastic unit, wherein at each of the first and second positions, one of the measure slots is aligned with the powder inlet slot while another the measure slot is aligned with the dispensing opening. 
     In addition, the slide housing has a plurality of indent grooves provided at an inner circumferential surface of the slide housing. The slide has a guiding protrusion protruded from an outer surface of the slide and arranged in such a manner that when the slide is slidably rotated within the slide housing, the guiding protrusion is guided to slide at the indent grooves, wherein a height of the guiding protrusion is larger than a depth of each of the indent grooves. 
     Accordingly, the device further comprises a powder container for containing the powder materials therein, wherein the powder container has a bottom opening and arranged in such a manner that when the slide housing is coupled at a bottom side of the powder container, the bottom opening is aligned with the powder inlet slot. 
     The advantage of the present invention is that the slide can fittingly press at the slide housing by means of the elastic force of the elastic unit to minimize the clearance between the slide and the slide housing and to enhance the sliding movement of the slide with respect to slide housing. In addition, the present invention provides a simple structural configuration for reducing the precision level of the manufacturing and assembling requirement of the device. 
     These and other objectives, features, and advantages of the present invention will become apparent from the following detailed description, the accompanying drawings, and the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a top exploded perspective view of a dispenser for measuring and dispensing powder materials according to a first preferred embodiment of the present invention, illustrating the powder container being supported at an upright position. 
         FIG. 2  is a bottom exploded perspective view of the dispenser according to the above first preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 2 . 
         FIG. 3  is a top exploded perspective view of the dispenser according to the above first preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 3 . 
         FIG. 4  is a perspective view of the dispenser according to the above first preferred embodiment of the present invention, illustrating the slide at a first position, wherein the powder container is omitted in  FIG. 4 . 
         FIG. 5  is a sectional view of the dispenser according to the above first preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 6  is a perspective view of the dispenser according to the above first preferred embodiment of the present invention, illustrating the slide at a second position, wherein the powder container is omitted in  FIG. 6 . 
         FIG. 7  is a sectional view of the dispenser according to the above first preferred embodiment of the present invention, illustrating the slide at the second position. 
         FIG. 8  is a top exploded perspective view of a dispenser according to a second preferred embodiment of the present invention, illustrating the powder container being supported at an upright position. 
         FIG. 9  is a bottom exploded perspective view of the dispenser according to the above second preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 9 . 
         FIG. 10  is a perspective view of the dispenser according to the above second preferred embodiment of the present invention, illustrating the slide at a second position, wherein the powder container is omitted in  FIG. 10 . 
         FIG. 11  is a sectional view of the dispenser according to the above second preferred embodiment of the present invention, illustrating the slide at the second position. 
         FIG. 12  is a top exploded perspective view of the dispenser according to the above third preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 12 . 
         FIG. 13  is a bottom exploded perspective view of the dispenser according to the above third preferred embodiment of the present invention, illustrating the slide at a second position, wherein the powder container is omitted in  FIG. 13 . 
         FIG. 14  is a perspective view of the dispenser according to the above third preferred embodiment of the present invention, illustrating the slide at the first position, wherein the powder container is omitted in  FIG. 14 . 
         FIG. 15  is a perspective view of the dispenser according to the above third preferred embodiment of the present invention, illustrating the slide at the second position, wherein the powder container is omitted in  FIG. 15 . 
         FIG. 16  is an exploded perspective view of a dispenser according to a fourth preferred embodiment of the present invention, illustrating the powder container being supported at an upright position. 
         FIG. 17  is a perspective view of the dispenser according to the above fourth preferred embodiment of the present invention, illustrating the device being supported at an inverted position. 
         FIG. 18  is a sectional view of the dispenser according to the above fourth preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 19  is a sectional view of the dispenser according to the above fourth preferred embodiment of the present invention, illustrating the slide at the second position. 
         FIG. 20  is an exploded perspective view of a dispenser according to a fifth preferred embodiment of the present invention, illustrating the device being supported at an inverted position. 
         FIG. 21  is a perspective view of the dispenser according to the above fifth preferred embodiment of the present invention, illustrating the device being supported at an inverted position. 
         FIG. 22  is a partially enlarged view of the dispenser according to the above fifth preferred embodiment of the present invention. 
         FIG. 23  is a perspective view of a dispenser according to a sixth preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 24  is an exploded perspective view of the dispenser according to the above sixth preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 24 . 
         FIG. 25  is a perspective view of the dispenser according to the above sixth preferred embodiment of the present invention, illustrating the slide at the second position. 
         FIG. 26  is another exploded perspective view of the dispenser according to the above sixth preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 26 . 
         FIG. 27  is a top exploded perspective view of a dispenser according to a seventh preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 27 . 
         FIG. 28  is a bottom perspective view of the dispenser according to the above seventh preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 28 . 
         FIG. 29  is a bottom view of the dispenser according to the above seventh preferred embodiment of the present invention. 
         FIG. 30  is a sectional view of the dispenser according to the above seventh preferred embodiment of the present invention. 
         FIG. 31  is a bottom perspective view of a dispenser according to an eighth preferred embodiment of the present invention, illustrating the slide at the first position, wherein the powder container is omitted in  FIG. 31 . 
         FIG. 32  is an exploded perspective view of the dispenser according to the above eighth preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 32 . 
         FIG. 33  is a bottom perspective view of the dispenser according to the above eighth preferred embodiment of the present invention, illustrating the slide being rotated 90°, wherein the powder container is omitted in  FIG. 33 . 
         FIG. 34  is another exploded perspective view of the dispenser according to the above eighth preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 34 . 
         FIG. 35  is a sectional view of a dispenser according to the above eighth preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 36  is a front view of the dispenser according to the above eighth preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 37  is a sectional view of the dispenser according to the above eighth preferred embodiment of the present invention, illustrating the slide being rotated 90°. 
         FIG. 38  is a front view of the dispenser according to the above eighth preferred embodiment of the present invention, illustrating the slide being rotated 90°. 
         FIG. 39  is an exploded perspective view of a dispenser according to a ninth preferred embodiment of the present invention. 
         FIG. 40  is a bottom perspective view of the dispenser according to a tenth preferred embodiment of the present invention, illustrating the slide at the first position, wherein the powder container is omitted in  FIG. 40 . 
         FIG. 41  is a sectional view of the dispenser according to the above tenth preferred embodiment of the present invention, illustrating the slide at the first position, wherein the powder container is omitted in  FIG. 41 . 
         FIG. 42  is an exploded perspective view of the dispenser according to the above tenth preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 42 . 
         FIG. 43  is a bottom perspective view of the dispenser according to the above tenth preferred embodiment of the present invention, illustrating the slide at the second position, wherein the powder container is omitted in  FIG. 43 . 
         FIG. 44  is a sectional view of the dispenser according to the above tenth preferred embodiment of the present invention, illustrating the slide at the second position, wherein the powder container is omitted in  FIG. 44 . 
         FIG. 45  is another exploded perspective view of the dispenser according to the above tenth preferred embodiment of the present invention, wherein the powder container is omitted in  FIG. 45 . 
         FIG. 46  is an exploded perspective view of a dispenser according to an eleventh preferred embodiment of the present invention. 
         FIG. 47  is an exploded perspective view of a dispenser according to a twelfth preferred embodiment of the present invention. 
         FIG. 48  is a perspective view of the dispenser according to the above twelfth preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 49  is a side view of the dispenser according to the above twelfth preferred embodiment of the present invention, illustrating the slide at the first position. 
         FIG. 50  is a perspective view of the dispenser according to the above twelfth preferred embodiment of the present invention, illustrating the slide at the second position. 
         FIG. 51  is a side view of the dispenser according to the above twelfth preferred embodiment of the present invention, illustrating the slide at the second position. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to  FIGS. 1 to 7  of the drawings, a device for measuring and dispensing powder materials according to a first preferred embodiment of the present invention is illustrated, wherein the device, as a dispenser, comprises a powder container  1 , a slide housing  2 , a slide  3 , a cover panel  4 , a retention panel  5 , and an elastic unit  6 . The powder container  1  is adapted for containing the powder materials therein, wherein the powder container  1  has a bottom opening for the powder materials dispensing therefrom. The slide housing  2  has a through powder inlet slot  21  extended through the slide housing  2  along a direction of gravity. Accordingly, an inlet of the powder inlet slot  21  of the slide housing  2  has an engaging rim  22  in circular shape. The inner side of the engaging rim  22  engages with an outer side of the bottom rim of the powder container  1 , wherein a plurality of rim clippers  221  are spacedly provided at the inner side of the engaging rim  22  to engage with a plurality of rim slots of the outer side of the bottom rim of the powder container  1  respectively. The slide housing  2  further comprises two parallel guiding panels  23 , wherein the guiding panels  23  are spacedly provided at two sides of the outlet of the powder inlet slot  21  of the slide housing  2  to guide the slide  3  in a sliding manner. The outlet of the powder inlet slot  21  has a flat bottom surface  211 . The slide housing  2  comprises a first retention member  24  provided adjacent to the outlet of the powder inlet slot  21 . 
     The slide  3  is a one-piece integral member, wherein the slide  3  comprises a blocking panel  31  and a blocking wall  32  having a circular shape formed at a lateral side of the blocking panel  31 . The blocking panel  31  has a coupling side  311  which is a flat surface, wherein the coupling side  311  of the blocking panel  31  is engaged with the coupling the flat bottom surface  211  of the slide housing  2  by means of surface-to-surface engagement. The slide  3  further comprises a second retention member  312  protruded from the coupling side  311  of the blocking panel  31  to limit the movement of the slide housing  2 . The blocking wall  32  forms a measure slot  321  therewithin, wherein the measure slot  321  is a through slot extended through the slide  3  from top to bottom. The top surface  322  of the measure slot  321  is formed at the coupling side of the blocking panel  31  at a planar direction. The bottom surface  323  of the measure slot  321  is a flat surface being biased against by the elastic unit  6 . The cover panel  4  is a thin panel and has two guiding holes  41  spacedly formed thereon. The retention panel  5  comprises a base panel  51  and two side panels  52  upwardly extended from two side edges of the base panel  51  respectively, wherein the base panel  51  has four opening slots  511  and two retention pillars  512 . Each of the side panels  52  has a clip slot  521  indently provided at the outer side thereof. Each of the guiding panels  23  has a corresponding clipper  231  engaging with the respective clip slot  521  such that when the clippers  231  are engaged with the clip slots  521  respectively, the side panels  52  are coupled with the guiding panels  23  respectively. The elastic unit  6  comprises four elastic elements  6 , wherein the elastic elements  6  are spacedly and integrally extended from the retention panel  5 . Accordingly, the retention panel  5  has four slots  511  to form the elastic elements  6  which are extended towards the slide  3 . In other words, the free ends of the elastic elements  6  are suspendedly extended from the retention panel  5 . According to the first embodiment, each of the elastic elements  6  has an affixing end integrally extended from the retention panel  5  and the free end extended to bias against the slide  3 . 
     In order to assemble the device of the present invention, the rim clippers  221  of the slide housing  2  are engaged with the rim slots of the bottom rim of the powder container  1  respectively to secure the slide housing  2  at the bottom rim of the powder container  1 , such that the bottom opening of the powder container  1  communicates with the powder inlet slot  21  of the slide housing  2 . By pressing the slide  3  at the slide housing  2 , the coupling side  311  of the slide  3  is fittingly biased against the bottom surface  211  of the powder inlet slot  21  of the slide housing  2 . The guiding holes  41  of the cover panel  4  are engaged with the retention pillars  512  of the retention panel  5  to retain the cover panel  4  at a position that the free ends of the elastic elements  6  are biased against the cover panel  4 . Then, the clippers  231  of the slide housing  2  are engaged with the clip slots  521  of the retention panel  5  respectively to secure the retention panel  5  at the bottom portion of the slide housing  2 . Therefore, the elastic elements  6  apply the urging force against the cover panel  4  to fittingly press against the slide  3  so as to ensure the slide  3  being fittingly pressed against the slide housing  2  (i.e. the coupling side  311  of the slide  3  engaging with the bottom surface  211  of the slide housing  2 ). 
     Since the slide  3  is slidably engaged with the slide housing  2 , the slide  3  is adapted to horizontally slide between the first position and the second position. Accordingly, at the first position, the bottom opening of the powder container  1 , the powder inlet slot  21  of the slide housing  2 , and the measure slot  321  of the slide  3  are communicated with each other. The bottom side of the measure slot  321  of the slide  3  is covered by the cover panel  4 . Therefore, the powder materials in the powder container  1  fill at the measure slot  321  of the slide  3  through the powder inlet slot  21  of the slide housing  2 . In other words, the amount of the powder materials filled at the measure slot  321  of the slide  3  will be measured thereat. Then, when the slide  3  is slide horizontally until the second retention member  312  of the slide  3  reaches the first retention member  24  of the slide housing  2 , i.e. the second position of the slide  3 , the slide  3  is blocked to prevent the further sliding movement with respect to the slide housing  2 . At the second position, the measure slot  321  of the slide  3  is moved away from the slide housing  2  at a position that the cover panel  4  unseals the bottom side of the measure slot  321  of the slide  3  in such a manner that the powder materials at the measure slot  321  will be dispensed out of the measure slot  321  of the slide  3 . 
     According to the first embodiment, the slide  3  can be fittingly pressed against the slide housing  2  via the elastic elements  6  when the slide  3  is moved between the first and second positions, so as to minimize the clearance between the slide  3  and the slide housing  2 . In other words, the device can prevent the powder material from being leaked through the clearance between the slide  3  and the slide housing  2 . Through the urging force of the elastic elements  6 , the accuracy between the slide  3  and the slide housing  2  can be reduced and the precision installation of the slide  3  to the slide housing  2  can also be minimized, so as to substantially reduce the manufacturing cost of the device and to facilitate the mass production of the device of the present invention. 
     As shown in  FIGS. 8 to 11 , a device for measuring and dispensing powder materials of a second embodiment illustrates an alternative mode of the first embodiment, wherein the device comprises a powder container  1 , a slide housing  2 , a slide  3 , a retention panel  5 , and an elastic unit  6 . The slide housing  2  has a through powder inlet slot  21  extended through the slide housing  2  along a direction of gravity. An inlet of the powder inlet slot  21  of the slide housing  2  has an engaging rim  22  in circular shape. The inner side of the engaging rim  22  engages with an outer side of the bottom rim of the powder container  1 , wherein a plurality of rim clippers are spacedly provided at the inner side of the engaging rim  22  to engage with a plurality of rim slots of the outer side of the bottom rim of the powder container  1  respectively. The slide housing  2  further comprises two parallel guiding panels  23 , wherein the guiding panels  23  are spacedly provided at two sides of the outlet of the powder inlet slot  21  of the slide housing  2  to guide the slide  3  in a sliding manner. The slide  3  is a one-piece integral member, wherein the slide  3  comprises a blocking panel  31 , a pusher member  33  provided at one lateral side of the blocking panel  31 , and a blocking wall  32  having an oval shape formed at another lateral side of the blocking panel  31 . The blocking panel  31  has a coupling side  311  which is a flat surface. The blocking wall  32  forms a measure slot  321  therewithin, wherein the measure slot  321  is a through slot extended through the slide  3  from top to bottom. The top surface  322  of the measure slot  321  is formed at the coupling side  311  of the blocking panel  31  at a planar direction. The bottom surface  323  of the measure slot  321  is a flat surface. The retention panel  5  is a thin panel and has a through dispensing slot  51 . The elastic unit  6  comprises two elastic elements  6 , wherein each of the elastic elements  6  is an elastic strip bent in a predetermined shape to provide a predetermined elastic force. The elastic elements  6  are spacedly and integrally extended from the retention panel  5 , wherein each of the elastic elements  6  further comprises a clipping pillar  61  provided at a lateral side of the elastic element  6 . 
     In order to assemble the device of the present invention, the slide  3  is pressed at the slide housing  2  that the coupling side  311  of the slide  3  is fittingly biased against the bottom surface  211  of the powder inlet slot  21  of the slide housing  2 . The clipping pillars  61  of the elastic elements  6  are engaged with the clipping slots  231  of the guiding panels  23  of the slide housing  2  respectively, such that the elastic elements  6  apply the urging force against the retention panel  5  to fittingly retain the retention panel  5  at the slide housing  2 . Accordingly, a clearance between the retention panel  5  and the slide housing  2  is larger than a length of the originally expanded of each of the elastic elements  6 . Therefore, each of the elastic elements  6  will apply a pulling force to press against the retention panel  5  such that the retention panel  5  will press against the bottom surface  323  of the measure slot  321  of the slide  3 . The coupling side  311  of the slide will press against the slide housing  2 . When the slide  3  is moved at its first position, the powder inlet slot  21  of the slide housing  2  communicates with the measure slot  321  of the slide  3  while the outlet of the measure slot  321  is sealed by the retention panel  5 . When the slide  3  is slidably pushed by the pusher member  33  until the pusher member  33  reaches the first retention member  24  of the slide housing  2 , i.e. the second position of the slide  3 , the slide  3  is blocked to prevent the further sliding movement with respect to the slide housing  2 . At the second position, the powder inlet slot  21  of the slide housing  2  is sealed by the blocking panel  31  of the slide  3  while the measure slot  321  of the slide  3  is moved away from the powder inlet slot  21  and is moved to align with the dispensing slot  51  of the retention panel  5  for dispensing the powder materials from the measure slot  321  through the dispensing slot  51  of the retention panel  5 . 
     According to the second embodiment, the slide  3  can be fittingly pressed against the slide housing  2  via the elastic elements  6  when the slide  3  is moved between the first and second positions. Each of the elastic elements  6  has an affixing end affixed at the slide housing  2  and a free end biasing against the retention panel  5  to apply the upward pulling force thereat, such that the slide  3  is fittingly pressed at the slide housing  2  via the elastic elements  6  when the slide  3  is moved between the first and second positions. 
     As shown in  FIGS. 12 to 15 , a device for measuring and dispensing powder materials of a third embodiment illustrates an alternative mode of the first and second embodiments, wherein the device comprises a slide housing  2 , a slide  3 , and an elastic unit  6 . The slide housing  2  has a through powder inlet slot  21  extended through the slide housing  2  along a direction of gravity. An inlet of the powder inlet slot  21  of the slide housing  2  has an engaging rim  22  in circular shape. The inner side of the engaging rim  22  engages with an outer side of the bottom rim of the powder container, wherein a plurality of rim clippers  221  are spacedly provided at the inner side of the engaging rim  22  to engage with a plurality of rim slots of the outer side of the bottom rim of the powder container respectively. The slide housing  2  further comprises an axle  23  downwardly extended at a position adjacent to the outlet of the powder inlet slot  21  and a retention member  24  extended spacedly with respect to the axle  23 . The slide housing  2  further comprises a surrounding wall  32  having an arc shape, wherein an opening  26  is defined between two ends of the surrounding wall  25  for the slide  3  being slidably rotated in and out through the opening  26 . The slide  3  comprises a blocking panel  31  and a blocking wall  32  extended therefrom, wherein the blocking panel  31  has a coupling side  311  which is a flat surface. The top side  322  of the blocking wall  32  is aligned with the coupling side  311  of the blocking panel  31  at the same planar manner. The surrounding wall  32  forms a measure slot  321  therewithin, wherein the measure slot  321  is a blind slot. The blocking wall  32  further comprises an installing panel  324  horizontally extended therefrom, wherein the installing panel  324  has a rotating slot  325  formed thereat and three retention members  326  spacedly formed at the installing panel  324  around the rotating slot  325 . The elastic unit  6  has an affixing end  61  and two free ends  62 , wherein a rotating hole  611  is formed at the affixing end  61  of the elastic unit  6 . Three retention holes  612  are spacedly formed at the affixing end  61  of the elastic unit  6  around the rotating hole  611 . 
     In order to assemble the device of the present invention, the slide housing  2  is coupled with the bottom side of the powder container. The slide  3  and the elastic unit  6  are coupled at the axle  23  of the slide housing  2  respectively, wherein the axle  23  is inserted into the rotating slot  325  of the slide  3  and the rotating hole  611  of the elastic unit  6 . It is worth to mention that the slide  2  can be slidably rotated with respect to the slide housing  3  while the elastic unit  6  is non-rotatably coupled with the slide housing  3 . After the axle  23  is inserted into the rotating slot  325  of the slide  3  and the rotating hole  611  of the elastic unit  6 , a cap lock  27  is securely coupled with the axle  23  for preventing the slide  3  and the elastic unit  6  from being detached from the slide housing  2 . Accordingly, the slide  3  is adapted to slidably rotate with respect to the slide housing  2  between the first position and the second position. At the first position of the slide  3 , the powder inlet slot  21  of the slide housing  2  alignedly communicates with the measure slot  321  of the slide  3  such that the powder materials are filled in the measure slot  321  and are measured thereby. Accordingly, the slide  3  is blocked by the retention member  24  of the slide housing  2  at the first position. When the slide  3  is slidably rotated with respect to the axle  23 , the slide  3  is driven to rotate within the opening  26  until the blocking wall  32  of the slide  3  is blocked by the respective end of the surrounding wall  25 . The slide  3  is blocked for further rotational movement and the slide  3  is at the second position. At the second position, the powder inlet slot  21  of the slide housing  2  is sealed by the blocking panel  31  while the measure slot  321  is moved away from the power inlet slot  21 . Then, the device of the present invention can be placed at a slanted orientation for dispensing the powder materials from the measure slot  321 . 
     According to the third embodiment, the elastic element  6  has the affixing end coupled at the slide housing  2  and the free end biasing against the slide  3  to apply the upward pulling force thereat, such that the coupling side  311  of the slide  3  is fittingly pressed at the slide housing  2  via the elastic elements  6  when the slide  3  is moved between the first and second positions, so as to minimize the clearance between the slide  3  and the slide housing  2 . 
     As shown in  FIGS. 16 to 19 , a device for measuring and dispensing powder materials of a fourth embodiment illustrates an alternative mode of the first to third embodiments, wherein the device comprises a powder container  1 , a slide housing  2 , a slide  3 , a cover panel  4 , a pusher handle  5 , and an elastic unit  6 . The powder container  1  is adapted for containing the powder materials therein, wherein the powder container  1  has a bottom opening  11  for the powder materials dispensing therefrom. The slide housing  2  is integrally formed at the bottom side of the powder container  1  to form a one-piece integral member. The bottom opening  11  of the powder container  1  is aligned with the powder inlet slot  21  of the slide housing  2 . The slide  3  comprises a blocking panel  31 , a blocking wall  32  extended from one side of the blocking panel  31 , and a pusher lever  33  extended from another side of the blocking panel  31 . The blocking panel  31  has a coupling side  311  which is a flat surface. The blocking wall  32  forms a measure slot  321  therewithin. The cover panel  4  has a plurality of through slots  41 . The elastic unit  6  is coupled with the cover panel  4  at each of the through slots  41 , such that the elastic unit  6  is inclinedly supported at a suspended manner. The pusher handle  5  comprises a pusher head  51  and a pusher tail  52 , wherein the pusher head  51  of the pusher handle  5  is pivotally coupled with the outer wall  12  of the powder container  1  via a pivot axle  53 . A clipping slot  54  is provided at the pusher tail  52  of the pusher handle  5 . A resilient element  7  is provided between the pusher handle  5  and the outer wall  12  of the powder container  1  for applying an urging force against the pusher handle  5 . Accordingly, a mid-portion of the resilient element  7  is coupled at the pivot axle  53  while two end portions of the resilient element  7  bias against the outer wall  12  of the powder container  1  and the inner side of the pusher handle  5  respectively. 
     After the powder container  1  is installed, the cover panel  4  is coupled with the slide housing  2 , wherein the slide  3  is mounted between the cover panel  4  and the slide housing  2  and is pressed by the elastic unit  6  so as to ensure the coupling side  311  of the slide  3  is pressed on the slide housing  2 . The pusher lever  33  of the slide is coupled with the clipping slot  54  of the pusher handle  5 . According to the fourth embodiment, the elastic unit  6  has an affixing end affixed to the cover panel  4  and a free end extended to bias against the slide  3 . 
     When the slide  3  is retained at the first position, the measure slot  321  of the slide  3  alignedly communicates with the powder inlet slot  21  of the slide housing  2 . When the pusher tail  52  of the pusher handle  5  is driven to pivotally press towards the powder container  1 , the slide  3  is driven to slide horizontally. When the slide  3  is moved at the second position, the powder inlet slot  21  of the slide housing  2  is sealed by the blocking wall  31  while the measure slot  321  is moved away from the powder inlet slot  21  of the slide housing  2 . Therefore, the device of the present invention can be placed at a slanted orientation for dispensing the powder materials from the measure slot  321 . Once the pressing force at the pusher handle  5  is released, the pusher handle  5  is pivotally moved back to its position via the resilient element  7  so as to move the slide  3  back to the first position. 
     It is worth to mention that the user is able to dispense the powder material via the actuation of the pusher handle  5 . 
     According to the fourth embodiment, it is appreciated that the affixing end of the elastic unit  6  can be coupled at the powder container  1  while the free end of the elastic unit  6  is extended to upwardly pull the slide  3  so as to ensure the coupling side  311  of the slide  3  being fittingly pressed at the slide housing  2 . 
     As shown in  FIGS. 20 to 22 , a device for measuring and dispensing powder materials of a fifth embodiment illustrates an alternative mode of the first to fourth embodiments, wherein the device comprises a powder container  1 , a slide housing  2 , an elastic unit  3 A, and a slide  4 . The powder container  1  is adapted for containing the powder materials therein, wherein the powder container  1  has a bottom opening  11  for the powder materials dispensing therefrom. The slide housing  2  comprises a slide body  21  and a retention panel  22 . The slide body  21  is coupled at the bottom side of the powder container  1 , wherein the slide body  21  has a powder inlet slot  211  aligned with the bottom opening  11  of the powder container  1 . The slide body  21  further comprises two inverting hooks  212  extending spacedly and vertically. The retention panel  22 , which is a thin panel, has a through slot  221  aligned with the powder inlet slot  211 , two spaced apart hooking slots  222  aligned with the inverting hooks  212 , and two hook lockers  223  provided at the hooking slots  222  respectively. For installation, the inverting hooks  212  of the slide body  21  are extended through the hooking slots  222  of the retention panel  22  to engage with the hook lockers  223  respectively, such that the retention panel  22  is securely coupled at the bottom side of the slide body  21  so as to ensure the through slot  221  of the retention panel  22  being aligned with the powder inlet slot  211  of the slide body  21 . The slide  4  is coupled at the bottom side of the retention panel  22 , wherein the slide  4  comprises a blocking panel  41  and a blocking wall  42  extended from one side of the blocking panel  41 . The blocking panel  41  has a coupling side  411  which is a flat surface. A measure slot is formed within the blocking wall  42 . The elastic unit  3 A comprises two elastic elements  3 A each having a U-shaped cross section. Each of the elastic elements  3 A comprises a first holding panel  31 A and a second holding panel  32 A spacedly apart from the first holding panel  31 A, wherein each of the elastic elements  3 A clamps with side edges of the retention panel  22  and the blocking panel  41  at a position that the side edges of the retention panel  22  and the blocking panel  41  are sandwiched between the first and second holding panels  31 A,  32 A, such that the coupling side  411  of the slide  4  is fittingly pressed against the retention panel  22 . 
     As shown in  FIGS. 23 to 26 , a device for measuring and dispensing powder materials of a sixth embodiment illustrates an alternative mode of the first to fifth embodiments, wherein the device comprises a slide housing  2 , a slide  3 , a cover panel  4 , a retention panel  5 , and an elastic unit  6 . The slide housing  2  has a through powder inlet slot  21  extended through the slide housing  2  along a direction of gravity. Accordingly, an inlet of the powder inlet slot  21  of the slide housing  2  has an engaging rim  22  in circular shape. The slide housing  2  further comprises an axle  23  downwardly extended therefrom at a position adjacent to the powder inlet slot  21 , wherein a clipper  24  is provided at a free end of the axle  23 . The slide  3  comprises a ring-shaped inner wall  31  and a ring-shaped outer wall  32 , wherein a rotating slot  311  is provided at a center of the inner wall  31 . The slide  3  further comprises six blades  33  outwardly and radially extended from the inner wall  31  to the outer wall  32  to coaxially couple the inner wall  31  with the outer wall  32 , wherein six measure slots  34  are formed by the six blades  33  that each measure slot  34  is defined between every two neighboring blades  33 . In addition, each of the measure slots  34  is a through slot. The cover panel  4 , which is a thin circular panel, has a center rotating hole  41  and a dispensing opening  42  positioned adjacent to the rotating hole  41 . The retention panel  5 , which is also a thin circular panel, comprises a center retention pillar  51  and a clipping slot  52  provided at a free end of the retention pillar  51 . The retention pillar  51  has a hollow shape and forms a center rotating groove  53  at the retention pillar  51 . A second dispensing opening  54  is formed at the retention panel  5  at a position adjacent to the retention pillar  51 . The elastic unit  6  comprises three elastic elements  6  integrally formed at the retention panel  5  to form a one-piece integral member, wherein the elastic elements  6  are formed at three opening slots  55  of the retention panel  5  and are upwardly extended in a suspended manner. 
     In order to assemble the device of the present invention, the slide housing  2  is mounted at the bottom rim of the powder container. The rotating slot  311  of the slide  3 , the rotating hole  41  of the cover panel  4 , and the rotating groove  53  of the retention panel  5  are respectively mounted at the axle  23  of the slide housing  2 , wherein the clipper  24  is then engaged with the clipping slot  52  of the retention panel  5 . After the installation, the first dispensing opening  42  of the cover panel  4  communicates with the second dispensing opening  54  of the retention panel  5 , wherein the elastic elements  6  apply the urging force against the cover panel  4  to press the cover panel  4  at the slide  3 . 
     According to the sixth embodiment, the slide  3  is slidably rotated with respect to the slide housing  2 . Through the rotational movement of the slide  3 , the six measure slots  34  can be selectively adjusted to align with the powder inlet slot  21 . Accordingly, when the slide  3  is slidably rotated from the first position to the second position, i.e. six positions, one of the measure slots  34  will be aligned with the powder inlet slot  21  while another measure slot  34  will be aligned with the second dispensing opening  54 . The slide  3  has a coupling side  35  fittingly presses at the slide housing  2 , wherein the elastic elements  6  apply the urging force against the slide  3  to ensure the coupling side  35  fittingly pressing at the slide housing  2 , so as to minimize the clearance between the slide  3  and the slide housing  2 . 
     As shown in  FIGS. 27 to 30 , a device for measuring and dispensing powder materials of a seventh embodiment illustrates an alternative mode of the sixth embodiment, wherein the device of the seventh embodiment is the same as that of the sixth embodiment, except the elastic unit  6  is an individual component supported between the slide  3  and the slide housing  2 . Accordingly, the elastic unit  6  is a compression spring, wherein the cover panel  4  is omitted in the seventh embodiment. The slide housing  2  comprises an axle  23  extended downwardly and vertically, wherein the axle  23  has an inner threaded slot  231  formed at the free end of the axle  23 . The retention panel  5  comprises a mounting pillar  51  extended towards the slide housing  2 , wherein the mounting pillar  51  has a hollow shape and defines a receiving cavity  511  along the mounting pillar  51 . For installation, the compression spring  6  is disposed within the receiving cavity  511  of the mounting pillar  51 , wherein the axle  23  is coaxially passed through the receiving cavity  511 . Accordingly, the compression spring  6  is coaxially mounted at the axle  23  and locked by coupling a screw  7  at the inner thread slot  231  of the axle  23 , so as to retain the compression spring  6  in position. Then, the slide housing  2 , the slide  3 , and the retention panel  5  can be coupled with each other. The compression spring  6  will apply the urging force against the slide  3  to ensure the slide  3  being pressed at the slide housing  2 . 
     As shown in  FIGS. 31 to 38 , a device for measuring and dispensing powder materials of an eighth embodiment illustrates an alternative mode of the above embodiments, wherein the device comprises a slide housing  2 , a slide  3 , and an elastic unit  6 . The slide housing  2  comprises a slide body  21  and a cover panel  22 , wherein the slide body  21  has a through powder inlet slot  211  extended through the slide body  21  along a direction of gravity. Accordingly, an outlet of the powder inlet slot  21  of the slide housing  2  has an engaging rim  212  in circular shape to couple with the bottom side of the powder container. Two arc-shaped blocking walls  231  are spacedly formed adjacent to the outlet of the powder inlet slot  211  to define a dispensing opening  214  between two ends of the blocking walls  231  and a rotating cavity  215  within the blocking walls  231  which has either a circular shape or oval shape. The axis of the rotating cavity  215  is perpendicular to the direction of gravity. The cover panel  22  has a through hole  221 , wherein a plurality of bearings  222  are spacedly formed at the rim of the through hole  221 . Each of the bearings  222  has a ball shape, wherein an indent groove  223  is formed between every two neighboring bearings  222 , such that the cover panel  22  has a plurality of indention surfaces and corresponding protrusion surfaces provided around the through hole  221  in an alternated manner. A diameter of the slide  3  is larger than a size of the dispensing opening  214  of the slide housing  2  to prevent the slide  3  from being detached therefrom. The slide  3  comprises a left side panel  31 , a right side panel  32 , and four blades  33  radially extended between the left and right side panels  31 ,  32  to couple the left side panel  31  with the right side panel  32 . A connecting axle  34  is extended between the left and right side panels  31 ,  32  that the blades  33  are extended from the connecting axle  34 . In addition, four measure slots  35   a ,  35   b ,  35   c ,  35   d  are formed by the blades  33  that each of the measure slots  35   a ,  35   b ,  35   c ,  35   d  is formed between every two of the blades  33 . A rotation button  36  is provided at one side of the left side panel  31  for the user to rotate the slide  3 . A guiding protrusion  37  is provided at the left side panel  31  at a position adjacent to the rotation button  36 . The elastic unit  6  comprises a plurality of elastic elements radially and inwardly extended from the blocking walls  213 , wherein each of the elastic elements  6  has an affixing end extended from the respective blocking wall  213  and a free end extended towards the center of the rotating cavity  215  in a suspended manner. 
     In order to assemble the device of the present invention, the slide  3  is horizontally disposed within the rotating cavity  215 , wherein the cover panel  22  is locked at the side of the slide body  21  to retain the slide  3  at a position between the cover panel  22  and the elastic unit  6 . When the slide  3  is rotated, the guiding protrusion  37  of the slide  3  is slid at the surfaces of the bearings  222  of the slide housing  2 . When the guiding protrusion  37  is slid at one of the indention surface of the slide housing  2 , the slide  3  is horizontally shifted. At the same time, the elastic elements  6  apply the urging force against the right side panel  32  of the slide  3 . Therefore, during the rotational movement of the slide  3 , the slide  3  is kept moving left and right to shake the slide  3  at the horizontal direction so as to minimize the clearance between the slide  3  and the slide housing  2  and to enhance the powder materials being dispensed through the vibration of the slide  3 . 
     According to the eighth embodiment, the outer side of the left side panel  31  of the slide  3  is contacted with the cover panel  22 , wherein the outer side of the left side panel  31  is the coupling side  311  thereof. The outer side  321  of the right side panel  32  is contacted with the elastic unit  6 , wherein the elastic element  6  has an affixing end coupled with the slide housing  2  to prevent the coupling side  311  from being moved, and a free end for applying the urging force at the slide  3  to ensure the slide  3  being fittingly pressed at the slide housing  2 . 
     According to the eighth embodiment, the slide  3  is slidably rotated with respect to the slide housing  2  between the first and second positions. At the first position, one of the measure slots  35   a  is aligned with the powder inlet slot  211  for inputting the powder materials. Another measure slot  35   c  is aligned with the dispensing opening  214  for dispensing the powder materials. When the slide  3  is rotated at 90°, the measure slot  35   d  is aligned with the powder inlet slot  211  for inputting the powder materials while the measure slot  35   b  is aligned with the dispensing opening  214  for dispensing the powder materials. When the slide  3  is kept rotating at 90°, i.e. the second position of the slide  3 , the measure slot  35   c  is aligned with the powder inlet slot  211  for inputting the powder materials while the measure slot  35   a  is aligned with the dispensing opening  214  for dispensing the powder materials. 
     As shown in  FIG. 39 , a device for measuring and dispensing powder materials of a ninth embodiment illustrates another alternative mode of the above embodiment, wherein the device of the ninth embodiment is the same as the eighth embodiment, except the slide housing  2  does not contain the cover panel  22 . Therefore, there is no vibration created during the rotational movement of the slide  3 . 
     As shown in  FIGS. 40 to 45 , a device for measuring and dispensing powder materials of a tenth embodiment illustrates another alternative mode of the above embodiments, wherein the device comprises a slide housing  2 , a slide  3 , a retention panel  5 , and an elastic unit  6 . The slide housing  2  has a through powder inlet slot  21  extended through the slide housing  2  along a direction of gravity. An inlet of the powder inlet slot  21  of the slide housing  2  has an engaging rim  22  in circular shape to engage with the bottom side of the powder container. The slide housing  2  further comprises two guiding panels  23  formed at two sides of the powder inlet slot  21  respectively, wherein two clippers  24  are formed at two outer sides of the guiding panels  23  respectively. The slide  3  comprises a blocking panel  31  and a blocking wall  32 . The blocking panel  31  has a coupling side  311  which is a flat surface. The slide  3  further comprises a guiding strip  33  downwardly extended from the blocking panel  31  at a position away from the blocking wall  32 . The top side  322  of the blocking wall  32  is formed to align with the coupling side  311  of the blocking panel  31  at a same planar manner. A measure slot  321  is formed within the blocking wall  32 . The retention panel  5  comprises a base panel  51  and two side panels  52  upwardly extended from two side edges of the base panel  51  respectively, wherein an elongated guiding slot  511  is formed at the base panel  51 . Two clipping slots  521  are formed at the side panels  52  to engage with the clippers  24  of the slide housing  2 . The elastic unit  6  is integrally extended from the slide  3  at a position that the elastic unit  6  is inclinedly extended from the outer side  312  of the blocking panel  31 . 
     For installation, the slide housing  2  is mounted at the bottom side of the powder container. The slide  3  is guided to slidably engage between the guiding panels  23 , wherein the retention panel  5  is mounted to the slide housing  2  at a position that the clipping slots  521  are engaged with the clippers  24  of the slide housing  2  respectively. Therefore, the slide  3  is pressed between the retention panel  5  and the slide housing  2 , wherein the guiding strip  33  of the slide  3  is slidably inserted into the guiding slot  511  to guide the sliding movement of the slide  3  along the guiding slot  511 . 
     According to the tenth embodiment, the coupling side  311  of the slide  3  is fittingly pressed at the slide housing  2 , wherein the affixing end  62  of the elastic unit  6  is affixed at the retention panel  5  while the retention panel  5  is mounted to the slide housing  2 . In other words, the affixing end  62  of the elastic unit  6  is immovable with respect to the slide housing  2 . The free end  61  of the elastic unit  6  is extended to press at the slide  3  to ensure the slide  3  being fittingly pressed at the slide housing  2 . 
     As shown in  FIG. 46 , a device for measuring and dispensing powder materials of a twelfth embodiment illustrates another alternative mode of the above embodiments, wherein the device comprises a powder container  1 , a slide housing  2 , a slide  3 , and an elastic unit  6 . The slide housing  2  has a through powder inlet slot  21  and comprises a first guiding panel  22  and a second guiding panel  23 , wherein the height of the second guiding panel  23  is higher than the height of the first guiding panel  22 . A first guiding track  221  is provided at the first guiding panel  22  while a second guiding track  231  is provided at the second guiding panel  23 , wherein the position level of the first guiding track  221  is the same of the position level of the second guiding track  231 . The second guiding panel  23  further comprises a partition panel  232  horizontally extended at the bottom edge of the second guiding panel  23 . In addition, the height of the second guiding panel  23  matches with the height of the slide  3 . The slide  3  comprises a blocking panel  31  and a blocking wall  32  extended therefrom, wherein the blocking panel  31  has a coupling side  311  which is a flat surface. The slide  3  further comprises a pusher member  33  downwardly extended from the blocking panel  31 , wherein the pusher member  33  has a pusher arm  331  extended from the blocking panel  31 . The blocking wall  32  has a top side  322  aligned with the coupling side  311  at a same planar manner. The measure slot  321  is defined within the blocking wall  32 . The elastic unit  6  has an affixing end  61  and a free end  62 , wherein a clipping slot  621  is formed at the free end  62  of the elastic unit  6 . 
     In order to assemble the device of the present invention, the slide housing  2  is coupled with the bottom side of the powder container  1 . The slide  3  is coupled with the slide housing  2  at a position that two side edges of the slide  3  are slidably coupled with the first and second guiding tracks  221 ,  231  of the first and second guiding panels  22 ,  23  respectively. Accordingly, the pusher arm  331  of the pusher member  33  is pushed to engage with the affixing end  61  of the elastic unit  6  until the clipping slot  621  of the elastic unit  6  is coupled with the pusher arm  331 . Then, the affixing end  61  of the elastic unit  6  is slidably engaged between the first and second guiding tracks  221 ,  231 , wherein the free end  62  of the elastic unit  6  is biased against the outer side  312  of the slide  3 . When the slide  3  is slidably pushed with respect to the slide housing  2 , the elastic unit  6  is driven to horizontally slide along the first and second guiding tracks  221 ,  231 , wherein the coupling side  311  of the slide  3  is slidably pressed at the slide housing  2  during the sliding movement of the slide  3 . 
     According to the twelfth embodiment, the elastic unit  6  is also driven to slide during the sliding movement of the slide  3 . In particularly, the affixing end  61  of the elastic unit  6  is horizontally slid along the first and second guiding tracks  221 ,  231 . The free end  62  of the elastic unit  6  is upwardly pressed at the slide  3  at all time during the sliding movement of the slide  3  since the affixing end  61  of the elastic unit  6  is moved corresponding to the sliding movement of the slide  3 . 
     Accordingly, the slide  3  is slidably coupled with the slide housing  2  and is pressed by the elastic unit  6 . In other words, when the slide  3  is at an idle (not moving) state, the elastic unit  6  will apply the urging force against the slide  3 . When the slide is at a sliding state (during sliding movement), the elastic unit  6  will keep applying the urging force against the slide  3 . Therefore, the urging force of the elastic unit  6  can regulate to minimize the clearance between the slide  3  and the slide housing  2 . In other words, even though the size of the slide  3  is not perfectly match with the slide housing  2 , the elastic unit  6  can always adjust the position of the slide  3  to minimize the clearance and to ensure the coupling side  311  of the slide  3  pressing at the slide housing  2  for preventing the powder materials from being leaked through the clearance. In addition, the elastic unit  6  can further enhance the sliding movement of the slide  3  with respect to the slide housing  2 . The structural configuration of the elastic unit  6  can effectively address the shortcomings of the existing fixed structure and can reduce the precision of molding, parts manufacturing, and assembly of all aspects of the device. Through the elastic unit  6 , all components can be assembled to form the final product with the best performance and the device can be mass produced to meet the performance requirements of the product. 
     The assembling method the elastic unit  6  is very flexible. The elastic unit  6  can be integrally formed with the slide housing  2  or the slide  3 , wherein the elastic unit  6  can be an elastic piece, an elastic strip, an elastic panel, or a floating panel. The elastic unit  6  can also be an individual component to install into the device, wherein the elastic unit  6  can be an elastic piece, a compression spring, a spring clip, silica gel, foam, or other elastic materials. The elastic unit  6  can have one, two, or a plurality of elastic elements, wherein each of the elastic elements can have one or more affixing ends while each of the elastic elements can have one or more free ends as well. Accordingly, once the affixing end of the elastic unit  6  is affixed in position, the free end of the elastic unit  6  can directly or indirectly apply the urging force against the slide  3  to ensure the slide  3  fittingly pressing at the slide housing  2 . 
     One skilled in the art will understand that the embodiment of the present invention as shown in the drawings and described above is exemplary only and not intended to be limiting. 
     It will thus be seen that the objects of the present invention have been fully and effectively accomplished. The embodiments have been shown and described for the purposes of illustrating the functional and structural principles of the present invention and is subject to change without departure from such principles. Therefore, this invention includes all modifications encompassed within the spirit and scope of the following claims.