Abstract:
A protective barrier for use on a baseball field that is actuated by motion sensors that are housed within a structured base. The protective barrier is actuated when a projectile such as a baseball travels through the sensors line of sight. The barrier serves to sense when a line drive is hit towards a pitcher and will rapidly extend to block the baseball and greatly reduce the possibility of harm to the pitcher.

Description:
BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates generally to protective shield device and, more specifically, to extendable/retractable motion sensor based barrier derived to shield pitchers from line drives. 
   The device is comprised of a protective barrier that is actuated by motion sensors that are housed within a structured base. The protective barrier is actuated when a projectile travels through the sensors line of sight. The barrier should be furnished from a rigid yet sturdy material capable of sustaining direct impact from a projectile traveling at great speeds. 
   2. Description of the Prior Art 
   There are other extendable and retractable devices designed for the same purpose. Typical of these is U.S. Pat. No. 364,175 issued to Hurd on May 31, 1887. 
   Another patent was issued to White on Apr. 25, 1932 as U.S. Pat. No. 1,884,447. Yet another U.S. Pat. No. 3,086,430 was issued to Emmel on Apr. 23, 1963 and still yet another was issued on Sep. 20, 1970 to Bowersox et al as U.S. Pat. No. 3,530,775. 
   Another patent was issued to Terio on Mar. 18, 1986 as U.S. Pat. No. 4,576,507. Yet another U.S. Pat. No. 4,666,331 was issued to Riley on May 19, 1987. Another was issued to Pepe et al on Aug. 8, 2000 as U.S. Pat. No. 6,099,200 and still yet another was issued on Feb. 12, 2002 to Mohassel as U.S. Pat. No. 6,345,930. 
   Another patent was issued to Johnson on Sep. 30, 2003 as U.S. Pat. No. 6,626,606. Yet another French Patent No. FR2759103 A1 was issued to Yves on Aug. 7, 1998. Another was issued to Bernard on Sep. 18, 1998 as French Patent No. FR2760763 A1. 
   U.S. Pat. No. 364,175 
   Inventor: C, S Hurd 
   Issued: May 31, 1887 
   The combination of sliding hitching post having the spring pintle and enclosing case having the locking sleeve provided with suitable seat, and having the inclines face above said seat, adapted to press the spring pintle into the sliding post so that the same may be lowered, substantially as set forth. 
   U.S. Pat. No. 1,884,447 
   Inventor: L. J. White 
   Issued: Apr. 25, 1932 
   Thos invention relates to vehicle barriers or safety stops and, among other objects, aims to provide stop members adapted to projected, at will, into the path of traffic for the protection of gate entrances and the like. 
   U.S. Pat. No. 3,086,430 
   Inventor: D. T. Emmel 
   Issued: Apr. 23, 1963 
   This invention relates to equipment for the control of traffic and in particular relates to equipment for changing the number of traffic lanes as between the opposite sides of a highway or altering the lane pattern on either side. 
   U.S. Pat. No. 3,530,775 
   Inventor: Joseph W. Bowersox ET el 
   Issued: Sep. 29, 1970 
   A pop up traffic divider for use on a highway has a housing buried flush with the highway and containing a casing also flush with the highway and encompassing a column supported on the casing bottom and at top flush with the highway. An annular piston is disposed between the casing and the column and is moved up and down by differential pressure of fluid such as air. On the piston is a resilient, deformable tube retracted within the casing and expelled there from by movement of the piston. The upper end of the column and of the casing afford a rounded body or bodies over which the extended, deformable and resilient tube can be bent without injury. 
   U.S. Pat. No. 4,576,507 
   Inventor: Charles J. Terio 
   Issued: Nov. 28, 1984 
   A terrorist vehicle barrier is disclosed having high strength cables stretched between two vertical I-beams. The cables are attached to the I-beams in a unique shock absorbing arrangement. The barrier is actuatable from a position below ground to effectively arrest the motion of high speed terrorist vehicle. Various means are disclosed for actuating the gate. The barrier is designed to solve esthetic problems encountered in the making a building secure from terrorist attack as well as to be strong enough to stop a high speed vehicle with minimum damage to the barrier, the vehicle, or the vehicle driver. 
   U.S. Pat. No. 4,666,331 
   Inventor: William T. Riley 
   Issued: May 19, 1987 
   An instant defense barrier for providing unobtrusive protection for a building or other site. A plurality of barrier post assemblies are anchored in the earth. Each assembly includes a barrel and a post slidably fitted in the barrel. The head end of the post portion is essentially flush with the level of the roadbed when the post is in the normal, non-extended position. When activated by closing a switch, the post is propelled from the confined position in the barrel by an explosive charge, a compression spring or other propulsive forces to a locked extended position to provide a barrier against unauthorized passage by a motor vehicle. A plurality of auxiliary cables are optionally connected between adjacent posts to provide further obstruction to the progress of small vehicles, such as motorcycles or bicycles. 
   U.S. Pat. No. 6,099,200 
   Inventor: John J. Pepe et al 
   Issued: Aug. 8, 2000 
   An energy absorbing, retractable barrier used to stop the movement of vehicles. The device is employed to control access to entranceways driveways, roads and to secure a security perimeter around buildings and objects requiring such protection. The device consists of a reinforced telescoping bollard inserted into a foundation casing, which is imbedded below ground. The device is manually operated and is extended by self-contained gas-charged spring lift mechanism. The device contains a locking mechanism for securing the telescoping bollard in the extended and retracted positions. When in the retracted position the bollard is flush with the surface and can be traversed by a vehicle. The device is of simple design, easily installed and easily maintained. 
   U.S. Pat. No. 6,345,930 
   Inventor: Parvis Mohassel 
   Issued: Feb. 12, 2002 
   A retractable versatile bollard of simple construction is made of stainless steel. The post is generally cylindrical in shape and, when the bollard is in the stored position, the post sits in a sleeve in the ground below grade level. In active position, the post can be grasped by a handle and pulled up by human effort to where only a lower portion remains submerged underground. The lower portion of the cylindrical post has spiral threading that mates with spiral grooves at an upper sleeve portion of the sleeve when the post is turned after first raising the post to an appropriate point. Bollard has a safety lock permitting the post to be raised from a stored position to an active position and a double lock that prevents it to from being easily lowered by mischievous individuals from the raised active position to the stored position. 
   U.S. Pat. No. 6,626,606 
   Inventor: Dwight David Johnson 
   Issued: Sep. 30, 2003 
   A pylon or barrier arrangement which is recessed into the ground or other surfaces and includes a post-like pylon which is moveable between an extended position for control of vehicular or pedestrian traffic, and a retracted position beneath the ground. Movement of the pylon is achieved by a linear-type drive mechanism which acts as a clutch by decoupling from an upright and rotatable smooth drive shaft during abrupt downward driving of the pylon to avoid damage to the internal components of the arrangement. A sealing arrangement is provided for preventing the entry of debris into the interior of the pylon arrangement, and a heating unit is provided for preventing seizure of the arrangement during harsh weather conditions. 
   French. Patent Number FR2759103 
   Inventor: Loisel Yves 
   Issued: Aug. 7, 1998 
   The abstract or semi-automatic protection for a car parking space has a barrier which blocks entry to the parking space, a motor which can raise or lower the barrier, an electronic circuit to control operation of the motor, a battery to provide an autonomous source of energy for installation, a housing which can be fixed to the ground to enclose the controls and the barrier, and a remote control receiver allowing control of the motor from a distance. The electric control unit can incorporate facilities to identify a unique code associated with the legitimate owner of the space. An alarm can be activated if there is any attempt to manually operate the device. 
   French Patent Number FR2760763 
   Inventor: Boucher Bernard 
   Issued: Sep. 18, 1998 
   The bollard has a retractable tube with a soldered, convex top with a screw and damper. The upper tube is soldered to the convex end and slides inside the lower tube fixed at the base by a screw. The spring to raise the bollard is housed in the upper and lower tubes and rests against a ring which in turn rests against the axis. The stop is fixed to the upper tube and is guided through the groove in the lower tube. Eight Teflon runners are attached by screws to the retractable tube and slide over the guide tube which is attached to three Silent blocs (RTM). The spring exerts vertical pressure, raising the tube to the point where it reaches the stop. The gaps restrict the amount of air which can enter compensates for the effect of the spring by absorbing the shock. 
   While these extending and retracting barriers may be suitable for the purposes for which they were designed, they would not be as suitable for the purposes of the present invention, as hereinafter described. 
   SUMMARY OF THE PRESENT INVENTION 
   A primary object of the present invention is to provide an extendable and retractable barrier. 
   Another object of the present invention is to provide an extendable and retractable barrier suitable for the protection of baseball pitcher from on coming projectiles. 
   Yet another object of the present invention is to provide an extendable and retractable barrier that is actuated by motion detection sensors. 
   Still yet another object of the present invention is to provide an extendable and retractable barrier that can be housed below ground level. 
   Another object of the present invention is to provide an extendable and retractable barrier that consists of a protective screen, a plurality of motion detection sensors housed within an enclosure that is embedded below ground level. 
   Yet another object of the present invention is to provide extendable and retractable barrier that is actuated by motion detector sensors that once activated allows the barrier to traverse vertically by mechanical means along an allocated distance. 
   Still yet another object of the present invention is to provide an extendable and retractable barrier that provide protection for baseball pitcher from line drive balls that may exceed the pitcher means for retrieving said ball in an appropriate manner that may cause harm to his person. 
   Additional objects of the present invention will appear as the description proceeds. 
   The present invention overcomes the shortcomings of the prior art by providing an extendable and retractable barrier for the protection of baseball pitchers from line drive balls. The extendable and retractable barrier will attempt to eliminate the hazards, which exist when a line drive ball is hit towards a pitcher in a manner, and speed in which he may be injured or seriously hurt. The extendable and retractable barrier is to be furnished from a material that may absorb the kinetic energy delivered by the bat to the ball as it struck by the batter in the direction of the pitcher. The extendable and retractable barrier is to be actuated by a plurality of motion detection sensor housed within an enclosure that assists in the makeup of the extendable retractable barrier. The extendable and retractable barrier is to be housed within the ground, and consist of a protective screen, which is connected to a chain drive mechanism, which allows the protective screen to traverse within grooves of the main housing unit. The extendable and retractable barrier is also furnished with a plurality of drive motors coupled to a chain drive system, which provides the means for the protective screen to traverse an allocated length. 
   The foregoing and other objects and advantages will appear from the description to follow. In the description reference is made to the accompanying drawings, which forms a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. These embodiments will be described in sufficient detail to enable those skilled in the art to practice the invention, and it is to be understood that other embodiments may be utilized and that structural changes may be made without departing from the scope of the invention. In the accompanying drawings, like reference characters designate the same or similar parts throughout the several views. 
   The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is best defined by the appended claims. 

   
     BRIEF DESCRIPTION OF THE DRAWING FIGURES 
     In order that the invention may be more fully understood, it will now be described, by way of example, with reference to the accompanying drawing in which: 
       FIG. 1  is an illustrative view of the present invention in use. 
       FIG. 2  is a topographical view of the placement of the present invention in use. 
       FIG. 3  is a perspective view of the present invention. 
       FIG. 4  is a sectional view of the present invention. 
       FIG. 5  is a sectional view of the present invention. 
       FIG. 6  is a cross section view of the present invention. 
       FIG. 7  is a cross section view of the present invention 
       FIG. 8  is a detailed view of a section of chain drive and screen mounting bracket of the present invention. 
   

   DESCRIPTION OF THE REFERENCED NUMERALS 
   Turning now descriptively to the drawings, in which similar reference characters denote similar elements throughout the several view, the figures illustrate the Extendable Retractable Barrier of the present invention. With regard to the reference numerals used, the following numbering is used throughout the various drawing figures.
           10  Extendible Retractable Barrier of the present invention     12  protective screen     13  housing     14  sensors     16  pitcher     18  ball     20  batter     22  pitcher&#39;s mound     24  pitching rubber     26  home plate     28  screen mounting bracket     29  drive gear assembly     30  chain     32  seal     34  bearing block     36  motor     37  drive shaft     38  remote control     40  timer       

   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
   The following discussion describes in detail one embodiment of the invention (and several variations of that embodiment). This discussion should not be construed, however, as limiting the invention to those particular embodiments, practitioners skilled in the art will recognize numerous other embodiments as well. For definition of the complete scope of the invention, the reader is directed to appended claims. 
     FIG. 1  is the present invention  10 , an extendable retractable screen  12  having motion sensors  14  responsive to projectiles for extending said barrier. Shown is a ball  18  being hit by a batter in a line drive fashion. Also shown is the screen  12  deflecting the ball  18  before it reaches the pitcher  16  thus insuring the functionality of said invention. Further shown is the intended location for the proper use of the present invention  10  to further insure that its functionality is preserved. 
     FIG. 2  is the present invention  10 , an extendable retractable barrier having motion sensors responsive to projectiles for extending said barrier. Shown is the typical location for the present invention  10  to insure that the proper functionality is maintained. Also shown is the present invention  10  as it relates to a baseball diamond. Further shown is the typical position of the present invention  10  as it correlates to the pitchers mound  22 , the pitchers rubber  24  and home plate  26 . The actual distance may vary due to the overall change in field size between leagues, shown is a visual representation of the present invention  10  intended location. 
     FIG. 3  shows a perspective view of the present invention  10 . Shown are call outs of the items which comprise said invention. Also shown is a visual representation of the present invention  10  as it may look at the time of manufacturing and assembly. Also shown is the interrelation of the sensors  14  as they relate to the housing unit  13  of said invention  10 . Further shown is the relation of the housing unit  10  as it relates to the protective screen  12 . Shown is a plurality of sensors  14  that may comprise the present invention at the time of manufacturing. 
     FIG. 4  is shows a sectional view of the present invention  10 . Shown are call outs of several items which comprise the present invention  10 . Also shown is the intended interrelation of these parts in order to obtain the functionality of said invention  10 . Shown is the screen  12 , and the screen mounting bracket  28  as they are furnished to the drive gear assembly  29  which will allow the screen to traverse its intended distance. Also shown is the seal  32  which is housed within the ground of the field. Further shown is the relationship between the housing  13 , the seal  32  and the screen  12 . A timer  40  included to retract the screen  12  after per-determined period of time once the screen  12  is extended and deployed. This sectional view is depicted to show how the present invention  10  may appear at time of assembly. 
     FIG. 5  shows a sectional view of the present invention  10 , an extendable retractable screen  10  having motion sensors responsive to projectiles for extending said barrier. Shown is the drive mechanism  29  having raised the screen  12  to an elevated position. Said barrier having impact resistant screen  12  movable by means of chain  30  drive between a seated and extended position. 
     FIG. 6  is a cross section view of the present invention  10  taken from  FIG. 4  as indicated. Shown is the interrelation of the components which drive the screen into its intended functional position including the motor  36  and drive shaft  37 , the bearing block  34  and the chain  30  communicating therebetween. Also shown is the sensor  14  location as it relates to the main drive motor  36  of the present invention  10 . Further shown is an attempt to position all the functioning parts of the present invention  10  as they may appear during manufacturing and assembly. 
     FIG. 7  is a cross section view of the present invention  10  including a remote control actuator  38 . The device can be operated mechanically or by hand held remote control  38  as well as using the electronic sensors  14 . 
     FIG. 8  is a cross sectional view of the chain drive assembly  29  present invention. Shown is the intricate workings of the chain drive assembly  29  as the chain  30  is affixed to the screen mounting bracket  28  that is further affixed to the screen  12  with fastening means in order to insure repairability due to stress or natural wear of parts. 
   It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above. 
   While certain novel features of this invention have been shown and described and are pointed out in the annexed claims, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention. 
   Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various application without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.