Patent Publication Number: US-7584560-B2

Title: Rotary sign board

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a rotary sign board, and more particularly, to a rotary sign board having a case for surrounding the periphery of a display assembly, wherein the case is split into two or more case sections adapted to be pivoted through hinge assemblies, so that an advertisement object can be conveniently replaced. 
   2. Background of the Related Art 
   Generally, sign boards are frequently installed at places where many people come and go, such as a subway station, a bus terminal, an airport, or a railroad station. 
   Sign boards installed at a visible place so that many people see the sign boards are typically provided with a flat plate, on which an advertisement object is attached. However, cylindrical sign boards have been developed in order to allow more people to see advertisement information. 
     FIG. 1  is a cross-sectional view illustrating a cylindrical sign board according to the prior art. As shown in the drawing, the cylindrical sign board includes a rotary barrel  51  surrounding a cylindrical post W with a space formed between the rotary barrel  51  and the cylindrical post W, an advertisement object  50  being installed in the rotary barrel  51 , a support barrel  53  for rotatably supporting the rotary barrel  51  where the support barrel  53  being provided with a transparent window  52 , a plurality of fluorescent lamps  54  installed within the rotary barrel  51  so as to illuminate the advertisement object  50 , and a driving means including a motor M for driving the rotary barrel  51 . 
   The operation of the above-mentioned rotary sign board will be described. If power is applied to the motor M after the fluorescent lamps  54  are turned on, the rotary barrel  51  with the advertisement object  50  is rotated at a predetermined speed by the motor M. If the rotary barrel  51  is rotated at the predetermined speed, the advertisement object  50  is also rotated, so that people can see the advertisement information on the advertisement object  50  through the transparent window  52  in the support barrel  53 . 
   Here, the advertisement object  50  is fabricated by printing advertisement information on a film. If the fluorescent lamps  54  are turned on from the rear side of the advertisement object  50 , light transmits the film, thereby permitting the printed advertisement information to be more clearly seen even in the dark. 
   However, the above-mentioned rotary barrel has a problem in that the transparent window is completely removed from the support barrel in order to replace an advertisement object with a new one. Therefore, the replacement work is complicated and time-consuming. 
   In addition, the above-mentioned rotary barrel also has a problem in that the advertisement object is formed from one film and fixed to the rotary barrel, which makes the work for installing or removing the advertisement object complicated and time-consuming. 
   SUMMARY OF THE INVENTION 
   Accordingly, the present invention has been made in view of the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a rotary sign board with a case surrounding the outer periphery of a display unit, wherein the case is split into two or more case sections adapted to be capable of being pivoted through hinge assemblies, so that an advertisement object positioned within the rotary sign board can be conveniently replaced. 
   It is another object of the present invention to provide a rotary sign board adapted to allow the edges of an advertisement film to be inserted into film insertion slits formed in vertical anchoring bars and horizontal anchoring bars provided in the rotary sign board, wherein the edges of the advertisement film inserted into the film insertion slits are pressed and anchored by anchoring screws inserted through the vertical anchoring bars, so that the advertisement film can be simply and conveniently installed or removed. 
   It is another object of the present invention to provide a rotary sign board having a plurality of vertical anchoring bars spaced from each other at predetermined intervals, so that a plurality of advertisement films can be fitted in the spaces formed between the vertical anchoring films, respectively, whereby any of the advertisement films can be replaced. 
   It is another object of the present invention to provide a rotary sign board, in which two adjacent case sections are formed with hinge insertion grooves at the top and bottom ends of one pair of adjacent lateral edges thereof, thereby preventing a gap from being produced in the interface between the two adjacent case sections when the case sections are opened or closed. 
   It is another object of the present invention to provide a rotary sign board having a locking device for limiting the opening of case sections of the rotary sign board, wherein the locking device is adapted to be prevented from being inadvertently released, so that the loss of the locking device can be prevented. 
   It is yet another object of the present invention to provide a rotary sign board having a frame anchored to the outer peripheral surface of a post, wherein the frame is adapted to be supported on the post through support arms, each of which is covered by one or more rubber members at the ends thereof, so that the support arms can be elastically anchored to the post. 
   To accomplish the above objects, according to the present invention, there is provided a rotary sign board comprising: a frame having a top frame body surrounding a post, and a bottom frame body arranged to be spaced from the top frame body; a display assembly rotatably installed between the top frame body and the bottom frame body of the frame; a case split into two or more case sections, the case sections being arranged between the top frame body and the bottom frame body so as to surround the outer periphery of the display assembly; and hinge assemblies provided at the top and bottom ends of the adjacent lateral edges of the case sections, respectively, so as to allow the case sections to be pivoted. 
   Here, each of the hinge assemblies may comprise an anchoring bracket anchored to the top frame body or the bottom frame body, first and second hinge plates anchored to the split case sections, respectively, and a connection pin inserted through the anchoring bracket, and the first and second hinge plates. As a result, the case sections can be safely pivoted. 
   Preferably, each of the case sections has a rectangular frame and a transparent window fitted in the rectangular frame. 
   Preferably, the case sections are provided with a locking device for limiting the opening of the case sections. 
   The case sections may have an insertion groove and an anchoring groove formed at the top ends of the adjacent edges of the rectangular frames, respectively. In such an event, the locking device may have an elongated leg inserted into the insertion groove, and an anchoring leg inserted into the anchoring groove, the elongated leg and the anchoring leg being formed by being bent downward, wherein the anchoring leg is shorter than the elongated leg so that the locking/release operation is performed by the anchoring leg. 
   The locking device may further comprise anti-release means for preventing the release of the elongated leg inserted into the insertion groove. 
   The case section with the insertion groove is formed with a through-hole at one side of the insertion groove, and the elongated leg is formed with an elongated groove on a side thereof. In addition, the anti-release means is implemented by a stop screw inserted through the through-hole so that the tip end of the stop screw is inserted into the elongated groove on the elongated leg inserted into the insertion groove, thereby preventing the loss of the locking device. 
   If the locking device is provided with a handle at the top thereof, it is easy to release the locking of the locking device. 
   The top and bottom frame bodies are fixedly installed on the post through a plurality of support arms, the front end of each of the support arms being formed with a bifurcated contact piece so as to be in contact with the post through the contact piece, and the rear end of each of the support arms being anchored to the top frame body or the bottom frame body. 
   If the ends of contact pieces are covered by rubber members, the frame can be elastically supported and the contact pieces can be prevented from being slit. 
   The case sections are formed with hinge insertion grooves at the top and bottom ends of one pair of adjacent lateral edges the rectangular frames so as to prevent from a gap being formed in the interface between the case sections. 
   According to another aspect of the present invention, there is provided a rotary sign board comprising: a frame having a top frame body surrounding a post, and a bottom frame body arranged to be spaced from the top frame body; a display assembly having a top rail rotatably installed on the top frame body, a bottom rail rotatably installed on the bottom frame body, two or more vertical anchoring bars vertically interconnecting the top rail and the bottom rail, each of the vertical anchoring bars being formed with film insertion slits along the opposite lateral edges, a pair of horizontal anchoring bars anchored to the top rail and the bottom rail, respectively, and advertisement films, the edges of which are inserted into the film insertion slits of the vertical anchoring bars and the horizontal anchoring bars; a case split into two or more case sections, the case sections being arranged between the top frame body and the bottom frame body so as to surround the outer periphery of the display assembly; and hinge assemblies provided at the top and bottom ends of the adjacent lateral edges of the case sections, respectively, so as to allow the case sections to be pivoted. As a result, the advertisement films can be easily replaced. 
   The display assembly may further comprise one or more anchoring screws for anchoring the advertisement films by being inserted through the vertical anchoring bars, so that the advertisement films can be conveniently anchored. 
   The display assembly may further comprise a support plate arranged between the top rail and the bottom rail in a cylindrical form so as to support the rear sides of the advertisement films. 
   According to another aspect of the present invention, there is provided a rotary sign board comprising: a frame having a top frame body surrounding a post, and a bottom frame body arranged to be spaced from the top frame body; a display assembly having a top rail rotatably installed on the top frame body, a bottom rail rotatably installed on the bottom frame body, two or more vertical anchoring bars vertically interconnecting the top rail and the bottom rail, each of the vertical anchoring bars being formed with film insertion slits along the opposite lateral edges, a pair of horizontal anchoring bars anchored to the top rail and the bottom rail, respectively, and advertisement films, the edges of which are inserted into the film insertion slits of the vertical anchoring bars and the horizontal anchoring bars; a case split into two or more case sections, the case sections being arranged between the top frame body and the bottom frame body so as to surround the outer periphery of the display assembly; and hinge assemblies, each comprising an anchoring bracket anchored to the top frame body or the bottom frame body, first and second hinge plates anchored to the case sections, respectively, and a connection pin inserted through the anchoring bracket, and the first and second hinge plates. 
   Here, the display assembly may further comprise one or more anchoring screws for anchoring the advertisement films by being inserted through the vertical anchoring bars. 
   In addition, the case sections may have an insertion groove and an anchoring groove formed at the top ends of the adjacent edges of the rectangular frames, respectively. In such an event, the locking device may have an elongated leg inserted into the insertion groove, and an anchoring leg inserted into the anchoring groove, wherein the elongated leg and the anchoring leg are formed by being bent downward, and the anchoring leg is shorter than the elongated leg, so that the locking/release operation is performed by the anchoring leg. 
   The case section with the insertion groove is preferably formed with a through-hole at one side of the insertion groove, the elongated leg is formed with an elongated groove on a side thereof, and the locking device preferably further comprises a stop screw inserted through the through-hole so that the tip end of the stop screw is inserted into the elongated groove on the elongated leg inserted into the insertion groove. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: 
       FIG. 1  is a cross-sectional view illustrating a cylindrical sign board of the prior art; 
       FIG. 2  is a perspective view showing a rotary sign board of the present invention; 
       FIG. 3  is a perspective view showing a frame of the rotary sign board of the present invention; 
       FIG. 4  is an exploded perspective view showing a display assembly of the rotary sign board of the present invention; 
       FIG. 5  is a perspective view showing a case of the rotary sign board of the present invention; 
       FIG. 6  is an exploded perspective view showing hinge assemblies of the rotary sign board of the present invention; 
       FIG. 7  is an exploded perspective view showing a locking device of the rotary sign board of the present invention; 
       FIG. 8  is a cross-sectional view of the rotary sign board of the present invention; 
       FIG. 9  is an enlarged plan view showing the “A” part of  FIG. 8 ; 
       FIG. 10  is an enlarged view showing the “B” and “C” parts of  FIG. 8 ; 
       FIG. 11  is an enlarged plan view showing the “D” part of  FIG. 8 ; 
       FIG. 12  is a perspective view showing hinge assemblies of the rotary sign board of the present invention; 
       FIG. 13  is a front cross-sectional view showing locking device of the sign board of the present invention; and 
       FIG. 14  is a side cross-sectional view showing the locking device of the sign board of the present invention. 
   

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. 
     FIG. 2  is a perspective view showing a rotary sign board according to the principles of the present invention,  FIG. 3  is a perspective view showing a frame of the rotary sign board of the present invention, and  FIG. 4  is an exploded perspective view showing a display assembly of the rotary sign board of the present invention. In addition,  FIG. 5  is a perspective view showing a case of the rotary sign board of the present invention,  FIG. 6  is an exploded perspective view showing hinge assemblies of the rotary sign board of the present invention, and  FIG. 7  is an exploded perspective view showing a locking device of the rotary sign board of the present invention. 
   First, as shown in  FIG. 2 , the rotary sign board of the present invention includes a frame  110  installed on a post W of a structure, a display assembly  120 , a case  130 , and a plurality of hinge assemblies  140 . 
   As shown in  FIG. 3 , the frame  110  includes a circular top frame body  111  arranged to surround the post W, a circular bottom frame body  112  located at a distance from the top frame body  111  and arranged to surround the post like the top frame body  111 , a tie bar  113  for interconnecting the upper and bottom frame bodies  111  and  112 , a plurality of support arms  114 , each of which is formed with a bifurcated contact piece  114   a  at one end thereof so that the one end of the support arm  114  is in contact with the post through the bifurcated contact piece  114   a  and the other end is anchored to the top frame body  111  or the bottom frame body  112 , a plurality of rubber members  114   b  where each end of the contact pieces  114   a  is covered by one of the rubber members  114   b , a plurality of leg members  115  that are anchored to the bottom face of the bottom frame body  112  where each leg member  115  is formed with a leveling part  115   a  at the bottom end thereof, and a plurality of rollers  111   a  and  112   a  arranged on the outer peripheries of the upper and bottom frame bodies  111  and  112  to be capable of idling where the rollers are equally spaced from each other in the circumferential direction. 
   As shown in  FIG. 4 , the display assembly  120  includes a top rail  121  rotatably installed through the rollers  111   a  of the top frame body  111 , a bottom rail  122  rotatably installed through the rollers  112   a  of the bottom frame body  112 , a plurality of support plates formed from polycarbonate and arranged in a cylindrical form between the top rail  121  and the bottom rail  122 , a plurality of vertical anchoring bars  124  for interconnecting the top and bottom rails  121  and  122  where each of the anchoring bars  124  has a pair of vertical film insertion slits  124   a  formed adjacent to opposite longitudinal edges thereof and through-holes  124   b  formed to be communicated with the vertical film insertion slits  124   a , a plurality of horizontal anchoring bars  125  where each of the horizontal anchoring bars  125  is formed with a horizontal film insertion slit  125   a  and anchored to the top rail  121  or the bottom rail  122 , a pair of advertisement films  126  inserted into the vertical film insertion slits  124   a  of the vertical anchoring bars  124  and the horizontal anchoring bars  125 , and a plurality of anchoring screws  127  inserted through and anchoring the vertical anchoring bars  124 . Here, the vertical anchoring bars  124  are spaced apart from each other so that each of the advertisement films  126  can be anchored between two adjacent anchoring bars. 
   As shown in  FIG. 5 , the case  130  is split into two or more split case sections, which are arranged to surround the outer periphery of the display assembly  120 . Each of the case sections  130   a  and  130   b  includes a rectangular frame  131  and a transparent window  132  fitted in the internal space defined by the rectangular frame  131 . 
   Here, the rectangular frames  131  of the case sections  130   a  and  130   b  are formed with an insertion groove  131   a  and an anchoring groove  131   b  at the top ends of one pair of adjacent lateral edges thereof, the insertion groove  131   a  and the anchoring groove  131   b  having depths different from each other. The insertion groove  131   a  is more deeply formed than the anchoring groove  131   b , and a through-hole  131   c  is formed at one side of the insertion groove  131   a  and communicates with the insertion groove  131   a . In addition, the rectangular frames  131  of the case sections  130   a  and  130   b  are formed with hinge insertion grooves  131   d  at the top and bottom ends of the other pair of adjacent lateral edges thereof, respectively. 
   As shown in  FIG. 6 , each of the hinge assemblies  140  includes first hinge plates  141  formed with first pin bores  141   a , second hinge plates  142  formed with second pin bores  142   a , anchoring brackets  143  where the rear end of each anchoring bracket is anchored to the top frame body  111  or the bottom frame body  112  and the front end of each anchoring bracket is formed with an anchoring pin bore  143   a , and connection pins  144  inserted into the pin bores  141   a ,  142   a  and  143   a  of the first hinge plate  141 , the second hinge plate  142  and the anchoring bracket  143 . The hinge assemblies  140  are provided at the top and bottom ends of the adjacent lateral edges of the rectangular frames  131  of the case sections  130   a  and  130   b , respectively, thereby permitting the case sections  130   a  and  130   b  to be pivoted about the hinge assemblies  140  on the frame  110 . 
   Meanwhile, the case sections  130   a  and  130   b  are provided with locking device  150  (shown in  FIG. 7 ) for limiting the opening of the case sections  130   a  and  130   b . The locking device  150  are provided on the top and bottom ends of the rectangular frames  131  of the case sections  130   a  and  130   b  at an area to be opened. 
   As shown in  FIG. 7 , the locking device  150  located at the top end of the rectangular frames  131  of the case sections  130   a  and  130   b  includes an elongated leg  151  bent downward at one side of the locking device  150 , an anchoring leg  152  bent downward at the other side of the locking device  150 , and a ring-like handle  153  formed at the center of the top side of the locking device  150 . The elongated leg  151  is substantially parallel to the anchoring leg  152 . The elongated leg  151  is formed with an elongated groove  151   a  at a longitudinal edge thereof, and is inserted into the insertion groove  131   a  formed one of the case sections  130   a  and  130   b . The anchoring leg  152  is inserted into the anchoring groove  131   b  of the other case section  130 . 
   In addition, in order to prevent the elongated leg  151  from being inadvertently released from the insertion groove  131   a , an anchoring screw  154 , which serves as anti-release means, is inserted into the through-hole  131   c  formed at the one side of the insertion groove  131   a.    
   Here, the tip end of the anchoring screw  154  inserted into the through-hole  131   c  is inserted into the elongated groove  151   a  formed on the elongated leg  151 , wherein the length of the elongated groove  151   a  is determined to correspond to the insertion and release distance of the anchoring leg  152  in relation to the insertion groove  131   a.    
   Meanwhile, the locking device  150 ′ located at the bottom side of the case sections  130   a  and  130   b  is implemented by a locking device which can be locked or released by a separate key, so that a manager possessing the key can unlock or lock the case sections  130   a  and  130   b . Because such a locking device  150 ′ is well known in the art, a detailed description thereof will be omitted. 
   Now, the action of the rotary sign board of the present invention configured as described above will be described. 
   Referring to  FIG. 8 , the circular bottom frame body  112  of the frame  110  arranged to surround a post W are supported on the floor by the leg members  115  located at the bottom side of the bottom frame body  112 , wherein the horizontal height of the frame  110  is adjusted through the leveling parts  115   a  formed at the bottom ends of the leg members  115 . The bottom frame body  112  is anchored to the post W when the rear ends of the support arms  114  are anchored to the bottom frame body  112  while the front ends of the support arms  114  are supported on the outer peripheral surface of the post W. 
   In addition, the top frame body  111  is anchored to the post W when the rear end of the support arms  114  are anchored to the top frame body  111  while the front ends of the support arms  114  are supported on the outer peripheral surface of the post W, like the bottom frame body  112 . The top frame body  111  is spaced apart from the bottom frame body  112 , and the space between the top frame body  111  and the bottom frame body  112  is uniformly maintained by the tie bar  113  anchored to the top frame body  111  and the bottom frame body  112 . 
     FIG. 9  is an enlarged plan view showing the “A” part of  FIG. 8 . As shown in  FIG. 9 , each of the bifurcated contact pieces  114   a  is covered by the rubber members  114   b  at the opposite ends thereof, and therefore the contact pieces  114   a  are in contact with the post through the rubber members  114   b . The support arms  114  are elastically anchored to the post and the tip ends of the contact pieces  114   a  are prevented from being slid. 
     FIG. 10  is an enlarged view showing the “B” and “C” parts of  FIG. 8 . As shown in  FIG. 10 , the top and bottom ends of the rectangular frames  131  of the case sections  130   a  and  130   b  are located at the outside of the top and bottom frame bodies  111  and  112  of the frame  110 , and the transparent windows  132  are fitted in the rectangular frames  131  anchored to the top and bottom frame bodies  111  and  112 . 
   The display assembly  120  is rotatably installed between the top and bottom frame bodies  111  and  112  inside of the transparent windows  132  of the case sections  130   a  and  130   b.    
   The display assembly  120  is assembled in the following manner. A plurality of rotatable rollers  111   a  and  112   a  are provided on the top and bottom frame bodies  111  and  112 . The top rail  121  is located above the rollers  111   a  provided on the top frame body  111 , and the bottom rail  122  is located below the rollers  112   a  provided on the bottom frame body  112 , wherein the cylindrical support plate  123  formed from polycarbonate is anchored between the top and bottom frame bodies  111  and  112 . 
   In addition, the horizontal anchoring bars  125 , each of which are formed with the horizontal film insertion slit  125   a , are oppositely fixed to the top and bottom frame bodies  111  and  112 , respectively. Therefore, the top and bottom edges of an advertisement film  126  with advertisement information are inserted into the film insertion slits  125   a  of the top and bottom horizontal anchoring bars  125 , and the rear side of the advertisement film  126  is supported by the support plate  126 . 
   In addition, each of the vertical anchoring bars  124 , which are provided between the top and bottom rails  121  and  122  to be spaced apart from each other so as to allow a plurality of split advertisement films  126 , is provided with vertical film insertion slits  124   a  at the opposite longitudinal edges thereof. 
   Therefore, the split advertisement films  126 , the top and bottom edges of which have been inserted into the horizontal film insertion slits  125   a  of the top and bottom horizontal bars  125 , are arranged to be in close contact with the support plate  123  by inserting the opposite lateral edges of the film  125  into the vertical film insertion slits  124   a  of the vertical anchoring bars  124 . 
     FIG. 11  is an enlarged plan view showing the “D” part of  FIG. 8 . Referring to  FIG. 11 , if the anchoring screws  127  are inserted into the through-holes  124   b  formed through the vertical anchoring bars  125 , the split advertisement films  126  interposed between the tip ends of the anchoring screws  127  and the support plate  123  are compressed between the tip ends of the anchoring screws  127  and the support plate  123 , or are penetrated by the tip ends of the anchoring screws  127 , thereby anchoring the advertisement films  126 . 
   To the contrary, when removing the split advertisement films  126 , the advertisement films  126  can be easily removed from the film insertion slits  124   a  of the vertical anchoring bars  126  by rotating the anchoring screws  127  in the direction of releasing the anchoring screws  127  so that the anchoring of the advertisement films  126  is released, and then by pulling the advertisement films  126 . 
   As shown in  FIG. 12 , the case sections  130   a  and  130   b  can be pivoted from the frame  110  through the hinge assemblies provided at the top and bottom parts of the case sections  130   a  and  130   b.    
   In the case of the hinge assembly  140  positioned at the bottom end, the rear ends of the first and second hinge plates  141  and  142  are anchored to the bottom ends of oppositely adjacent case sections  130   a  and  130   b , respectively, and the rear end of the anchoring bracket  143  is anchored to the bottom frame body  112 . In this state, a connection pin  144  is inserted through the pin bores  141   a ,  142   a  and  143   a  formed in the first hinge plate  141 , the second hinge plate  142 , and the anchoring bracket  143 . 
   In the case of the hinge assembly  140  positioned at the top end, the rear ends of the first and second hinge plates  141  and  142  are anchored to the top ends of the oppositely adjacent case sections  130   a  and  130   b , respectively, and the rear end of the anchoring bracket  143  is anchored to the top frame body  111 . In this state, a connection pin  144  is inserted through the pin bores  141   a ,  142   a  and  143   a  formed in the first hinge plate  141 , the second hinge plate  142 , and the anchoring bracket  143 . 
   Meanwhile, the pin bores  141   a ,  142   a  and  143   a  are inserted into the hinge insertion grooves  131   d , which are formed at the top and bottom ends of one pair of adjacent lateral edges of the rectangular frames  131  of the case sections  130   a  and  130   b , respectively. As a result, the interface E between the case sections is positioned at the rotational center of the hinge assembly, whereby no gap is produced in the interface between the case sections  130   a  and  130   b  when the case sections are opened or closed. 
   In the assembly as described above, the first hinge plates  141  and the second hinge plates  142 , which are anchored to the pair of the split case sections  130   a  and  130   b , respectively, are connected with the brackets  143 , which are anchored to the bottom frame body  112  and the top frame body  111 , respectively, through the connection pins  144 . As a result, the split case sections  130   a  and  130   b  can be pivoted about the connection pins  144 , thereby being opened or closed. 
   Referring to  FIGS. 13 and 14 , with the locking device  150  provided at the top of the case sections  130   a  and  130   b , the elongated leg  151  of the locking device  150  is inserted into the insertion groove  131   a  formed in one of the case sections  130   a  and  130   b , and the anchoring leg  152  of the locking device  150  is inserted into the anchoring groove  131   b  formed in the other case sections  130   a  and  130   b . The locking device  150  limits the opening of the case sections  130   a  and  130   b.    
   At this time, because the anchoring leg  152  is shorter than the elongated leg  151 , the elongated leg  151  remains in the insertion groove  131   a , even if the anchoring leg  152  is removed from the anchoring groove  131   b  so as to release the locking state. 
   In addition, if it is desired to release the locking state, it is possible to pull the locking device  150  upward by using the ring-like handle  153  provided at the top of the locking device. Therefore, the locking state can be easily released. 
   Furthermore, if an anchoring screw  154 , which serves as an anti-release means, is inserted into the through-hole  131   c  formed through a side of the insertion groove  131   a , the tip end of the anchoring screw  154  is engaged in the elongated groove provided on a side of the elongated leg  151 . The elongated leg  151  is prevented from being released from the insertion groove  131   a.    
   Meanwhile, the locking device  150 ′ provided at the bottom part is locked or released by a separate key, wherein a locking device locked or released by a key can be employed for the locking device  150 ′. Therefore, because such a locking device is well known in the art, a detailed description thereof will be omitted. 
   As described above, in the rotary sign board of the present invention, the case is split into two or more case sections surrounding the display assembly, wherein the split case sections are capable of being pivoted through the hinge assemblies, thereby being opened or closed. As a result, the advertisement object positioned within the rotary sign board can be easily replaced. 
   In the of the present invention rotary sign board, the edges of an advertisement film are inserted into the vertical anchoring bars and horizontal anchoring bars, and then the film is compressed and anchored by inserting the anchoring screws through the vertical anchoring bars. As a result, the advertisement film can be simply and conveniently installed or removed. 
   In addition, the vertical bars are arranged at a predetermined interval so that advertisement films can be fitted between the vertical anchoring bars, respectively. As a result, one or more selected advertisement films can be replaced. 
   In addition, the rotary sign board of the present invention is formed with hinge grooves at the top and bottom ends of the adjacent edges of the case sections at the side where the hinge assemblies are installed. As a result, it is possible to prevent a gap from being produced in the interface between the adjacent case sections when the case sections are opened or closed. 
   In the rotary sign board of the present invention, the locking device for limiting the opening of the case sections is prevented from being inadvertently released. As a result, it is possible to prevent the loss of the locking device. 
   In the rotary sign board of the present invention, the frame anchored to the outer peripheral surface of a post is supported on a post through the support arms, each of which has tip ends covered by rubber members. As a result, the frame can be elastically anchored. 
   While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims, and therefore, it is to be understood that other modifications and variations may be made without departing from the substance and scope of the present invention, as those skilled in the art will readily understand. Such alternate modifications and variations are within the scope of the present invention which is intended to be limited only by the appended claims and equivalents thereof.