Abstract:
A rack has a linear guide and a braking module. The braking module has a braking device, a braking block, a transmission shaft and a elastic device. A central end of the braking device expands toward one side of a slide rest so as to allow the control end to extend outwardly of the slide rest. The transmission shaft drives the braking block. The braking block touches the rails so as to achieve a braking effect.

Description:
RELATED U.S. APPLICATIONS 
   The present application is a continuation-in-part of U.S. application Ser. No. 10/948,482, filed on 21 Sep. 2004 now U.S. Pat. No. 7,124,902, and entitled “RACK WITH LINEAR GUIDE”. 

   STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
   Not applicable. 
   REFERENCE TO MICROFICHE APPENDIX 
   Not applicable. 
   FIELD OF THE INVENTION 
   The present invention relates generally to a rack, and more particularly to a rack which linear guide allows for linear movement. 
   BACKGROUND OF THE INVENTION 
   Generally, a rack is to be fixed at a certain place to hold and store articles. However, in some special locations, such as supermarkets and storehouses, the size and number of racks are too big , and any relocation and sorting of articles requires a large amount of time and labor, resulting in a waste of time and labor force as well as increasing costs. Consequently, this kind of fixed rack is not desirable. 
   Based on this notion, the inventor has provided the present invention of“RACK WITH LINEAR GUIDE” as a continuation-in-part of the invention described in a co-pending parent patent application. After development of the invention of the parent patent, the inventor still seeks a better and more practical structure. The inventor found that a braking module disclosed in the original case can adapt another structure besides the structure defined in the original case to achieve the effect of a rack with linear guide; therefore, it is defined herein. 
   BRIEF SUMMARY OF THE INVENTION 
   The present invention mainly modifies part of the structure described in the parent application. The braking module A comprises braking device  50 , braking block  60 , transmission shaft  70  and elastic device  80 . First, it uses the configuration that the control end  51  of the braking device  50  expands towards one side of the slide rest  20  to make the control end exposed to the external side of the rack  10  (as shown in  FIG. 1 ), making it more convenient to control. 
   Next, the present invention uses the transmission shaft  70  to drive the braking block  60 , and uses the transmission shaft  70  to move stably inside the internal base  90  for durability. Moreover, it uses the feature of the braking block  60  touching the rails  30  to achieve the braking effect and to achieve a more forceful braking effect than the invention of the parent application. 
   The above is a detailed description of the technical features of this invention. Any adjustment and revision of this invention should be subject to the invention and within the scope prescribed by the patent. 

   
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       FIG. 1  shows a perspective view of the preferred embodiment of the present invention. 
       FIG. 2  shows a perspective view of the partial structure of the invention. 
       FIG. 3  shows an exploded perspective view of the partial structure of the invention. 
       FIGS. 4-5  show lateral cross-sectional views of the movement of the braking component. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   The features and the advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings. 
   As shown in  FIGS. 1-4 , a rack with linear guide embodies the present invention. 
   A rack body  10  is composed of several shelves  11  and stings  12  of several directions (in this case, there are four directions). There are pre-set plugholes  13  at the end of each sting  12 . 
   Slide rests  20  are divided into two groups and set at the ends of the two stings  12  of the rack body  10 . This            -type slide rest is made of a metal plate and has a rut  21 . At both ends of the slide rest  20 , there are standing columns  22  to fit into the pre-set plugholes  13  at the end of each sting  12  of the rack body  21 .
   A compartmental roller  30  is fixed at the both ends of the rut  21  of the slide rest  20  by horizontal axis hitch  33 . This compartmental roller  30  can be divided into left roller  31  and right roller  32 , between which there is a compartmental rut  34 . The bottom edges of the left and right rollers  31   32  are both bulging from the slide rest  20 . 
   The invention includes two parallel sliding tracks  40 , each being composed of several independent sliding rails  41   42  which are connected and fixed (via bolts) on the floor at the position of the rack  10  to bear the two slide rests  20 . The rails  41   42  can be connected by flange  44  and concave rim  43 . The section of the rail is convex, in the middle of which there is a convex edge  45  (see  FIG. 4  for details). This convex edge  45  can fit into the compartmental rut  33  between the left and right rollers  31   32  and form a linear guide (see  FIG. 3  for details). 
   A blocker  46  is fixed at the end of the rail  41  to stop slide rest  20  and keep the rack  10  on the rail  40 . 
   Braking module A is fixed at the slide rest  20 , and it comprises a braking device  50 , a braking block  60 , a transmission shaft  70  and an elastic device  80 . Among them, the braking device  50  is fixed on the top surface  23  of the slide rest  20 , and it comprises a control end  51  and a braking end  52 . The braking end  52  is positioned pivotally, so that the control end  51  can use braking end  52  as a spinning point to oscillate up and down. The braking end  52  forms a curve section  53 , and the control end  51  extends towards one side of the slide rest  20 . The control end  51  of this embodiment is expanded like a “T” shape for human feet to step on. The braking block  60  is fixed at the bottom of the slide rest  20 , so that the bottom of the braking block  60  can touch the rail  41  or  42 . The transmission shaft  70  is placed inside the slide rest  20 , and can be slid up and down in a limiting position. The bottom of the transmission shaft  70  is connected to the braking block  60 , and the top  72  extends out to the top surface of the slide rest  20  and corresponds to the curve section of the braking device  50 . The elastic device  80  can be restored upward by the transmission shaft  70 . 
   Among them, the braking device  50  can be a bendable metal plate. 
   Among them, a U-shaped rest  24  can be placed on the top surface of the slide rest  20 , and a cross axle  25  can be placed on the U-shaped rest  24  for the braking end  52  of the braking device  50  to position pivotally. 
   Among them, an internal base  90  can be placed inside the slide rest  20  for the transmission shaft  70 , and a penetrating hole  91  can be placed inside the internal base  90  for the transmission shaft  70  to slide inside. The top of the penetrating hole  91  corresponds to a penetrating hole  230  at the top surface  23  of the slide rest  20 . The penetrating hole  91  has an expanding section  92  for the top of the transmission shaft  70  to set a flange  73 . The transmission shaft  70  is limited inside the expanding section  92 , which limits the transmission shaft  70  sliding up and down. The elastic device  80  mentioned herein can be placed between the flange  73  of the transmission shaft  70  and a blocking edge at the bottom of the penetrating hole  91 . 
   Among them, a screw hole  74  and a penetrating hole  61  may be placed at the bottom of the transmission shaft  70  and the braking block  60 . A bolt  62  for the penetrating hole  61  of the braking block  60  is used to tighten the screw hole  74  of the transmission shaft  70 , and to position the braking block and transmission shaft. 
   Through the above structure and design, the operation of the braking module  50  disclosed by the present invention is explained. 
   Because the braking module A disclosed in the present invention is fixed at the slide rest  20  of the rack, the operation of the braking module A can be stepping or picking it upward to control the control end  51  of the braking device  50  so that it is released in an upward angle, or braked in a downward angle. 
   As shown in  FIG. 4 , when the control end  51  of the braking device  50  of the braking module A is oscillating upward, the transmission shaft  70  can be pushed upward by the elastic device  80  and make the top of the transmission shaft  70  correspond to the first position  01  of the curve section of the braking device  50 . Under this condition, the space between the braking block  60  of the braking module A and the rails  41  is loose so as to make the rack  10  slide. 
   As shown in  FIG. 5 , when the control end  51  of the braking device  50  is forced downward to the limiting position, it causes the top  72  of the transmission shaft  70  to press down by the curve section  53  of the braking device  50 . Corresponding to the second position  02  of the curve section  53 , and under this condition, the braking block  60  of the braking module A descends and is pushed against the rail  41  because the transmission shaft  70  descends, securing the rack and at the same time pressing the elastic device  80  to accumulate elasticity. Therefore, when the control end  51  of the braking device  50  is restored upward, it can use the elasticity of the elastic device  80  to support the transmission shaft  70  upward and make the braking block  60  come off rails  41 . 
   Through the above structure and design, the rack  10  disclosed in the present invention can be placed on the rails  30  through the slide rest  2  at the bottom and achieve the purpose of linear slide within a pre-determined length (as shown in  FIG. 1 ). The braking module  50  is further used to control the sliding or positioning state of the rack  10 .