Abstract:
A confined space barrier comprises panels that secure into the entry into a confined space. The barrier provides an additional safeguard beyond the door or cover into the confined space, preventing accidental and unauthorized access into the confined space. The panels are adjustable horizontally to accommodate numerous entry widths.

Description:
CLAIM OF PRIORITY  
       [0001]     Applicant claims priority based on provisional patent application Ser. No. 60/628,370 filed Nov. 16, 2004, the entire contents of which are incorporated herein by reference. 
     
    
     TECHNICAL FIELD  
       [0002]     This invention relates generally to industrial safety, and more particularly to a confined space barrier that secures in the entryway to a confined space to prevent unapproved or unintended entry.  
       BACKGROUND AND SUMMARY OF THE INVENTION  
       [0003]     The Navy defines a confined space as a space too small or narrow for an average sized person to turn around in. OSHA defines a confined space as a space with a configuration that hinders the movement and activities of a worker who must enter, work in, or exit the space. Often, employees who work in confined spaces are at an increased risk of exposure to serious hazards such as entrapment, asphyxiation, or close proximity to moving parts of machinery. Entry into confined spaces requires approval. Additionally, certain precautions are required, such as having respiratory safety equipment on hand and having an additional person or persons positioned outside of the confined space while a person is inside the confined space to provide rescue or assistance to the person inside if needed.  
         [0004]     On a naval vessel, doorways and hatches may lead to a dangerous area. Some of these doors and doorways may be labeled and some may not. Additionally, the doors may be left open to facilitate ventilation into certain areas. A person may open an unlabeled door or enter through a door left open and not realize that they are entering a confined space. Without proper warning, the person may enter, suffer injury or cause damage, and be unable to exit the space. There are currently no safeguards to prevent a person from entering a confined space after the door has been opened.  
         [0005]     On industrial sites and naval bases, there are many equipment rooms, in-ground equipment and storage compartments, shafts, wells, manholes, and similar spaces that are confined spaces. Often the openings or covers to these confined spaces may need to be opened or removed without any intent to enter the confined space, but if the worker breaks the plane of the ground or entryway, they are considered as having entered the confined space. There are currently no safeguards to prevent these and other accidental entries into these confined spaces.  
         [0006]     The present invention comprises a confined space barrier which overcomes the foregoing and other difficulties which have long since characterized the prior art. In accordance with the broader aspects of the invention, the barrier is positioned inside the entry of a confined space providing a safeguard against accidental or unauthorized entry into the confined space whether the door or covering has been left open for ventilation, opened accidentally, or removed for an approved purpose when no entry is intended.  
         [0007]     In accordance with more specific aspects of the invention, the confined space barrier has two panels that secure into the entry frame behind the door or covering. Once the door or cover to the confined space is opened, the barrier must be removed before someone can access the confined space. The panels slide together and are adjusted horizontally to the width of the opening. The panels are then fastened together to hold them securely within the entry frame. For an additional safeguard, a printed warning or warning label may be printed or placed onto the front of the both panels giving notice that the compartment is a confined space.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]     A more complete understanding of the present invention may be had by reference to the following Detailed Description when taken in connection with the accompanying Drawings, wherein:  
         [0009]      FIG. 1  is a perspective view illustrating one embodiment of the present invention in use;  
         [0010]      FIG. 2  is an enlarged, exploded perspective view of the embodiment shown in  FIG. 1 ; and  
         [0011]      FIG. 3  is top view of the embodiment illustrated in  FIG. 1 .  
     
    
     DETAILED DESCRIPTION  
       [0012]     Referring now to the drawings, and particularly to  FIG. 1  thereof, there is shown a naval vessel  20  with a barrier  22  installed into a doorway  24 . The doorway  24  comprises a door  26  secured to a frame  28  on hinges  30 . The frame  28  has jambs  32  and  34  on opposite sides thereof.  
         [0013]     Referring to  FIG. 2 , there is shown an exploded view of the barrier  22 . The barrier  22  comprises an outer panel  40  and an interior panel  42 . The outer panel  40  faces outward from the confined space such that when the door  26  to the confined space is opened, the outer panel  40  is visible to the entering person(s). Both the outer panel  40  and the inner panel  42  may be fabricated of a rigid plastic material or metal, such as 5052 Aluminum having 0.050 inch or 0.080 inch thickness. Both the outer panel  40  and inner panel  42  are flanged on one end to conform to the shape of the door jambs  32  and  34 . Horizontal slots  44  are cut into the outer panel  40  near the top and bottom. The inner panel  42  has openings  46  at the top and bottom thereof corresponding to the location of the slots  44  in the outer panel  40 . The openings  46  accommodate fasteners  48  which are inserted through the openings  46  in the inner panel  42  and secured on the outside of the outer panel  40  by a locking nuts  50 . When the outer panel  40  and inner panel  42  are extended until the flanged end of the outer panel  40  is flush into door jamb  34  and the flanged end of the inner panel  42  is flush into door jamb  32 , the panels are secured in place by fasteners  48  and nuts  50 . The shown embodiment employs fasteners  48  comprising bolts that secure to nuts  50 . The present invention may also employ other suitable threaded fasteners and locking nuts known to those skilled in the art. C-clamps or other suitable clamping devices may also be used in the practice of the present invention.  
         [0014]     The panels  40  and  42  are adjustable to accommodate the width of standard door frames  24  and entryways into confined spaces on naval vessels, standard manhole openings, shaft openings, and a number of other entry widths into confined spaces. A warning label  52  may be affixed or printed on the front of the outer panel  40  which may include text such as “Caution, Confined Space, Permit required for entry” and other phrases approved by OSHA and the American National Standards Institute (ANSI). A warning label may also be placed or printed on the inner panel  42  for additional warning.  
         [0015]     Referring to  FIG. 3 , there is shown a top view of the outer panel  40  and inner panel  42  as they are secured together.  
         [0016]     Alternative to using the barrier  22  in the entry of a confined space protected by a door, the barrier  22  is also used in entry ways into other confined spaces, including manholes, equipment compartments, shafts, and other small compartments that classify as confined spaces. The barrier  22  may be adjusted to a number of widths and both the outer panel  40  and inner panel  42  are curved at each end to accommodate round openings as well as rectangular openings such as the doorway  24  shown in  FIG. 1  and  FIG. 2 .  
         [0017]     Another embodiment of the current invention comprises a slot on the inner panel  42  that corresponds in size and location to the slot  44  on the outer panel  40 . Two or more fasteners are employed in each slot  44 . The invention may employ fasteners such as carriage bolts and locking wing nuts or other suitable threaded fasteners and locking nuts known to those skilled in the art. C-clamps or other suitable clamping devices may also be used in the practice of the present invention.  
         [0018]     Another alternate embodiment of the present invention comprises two panels that are hinged on each end and open in the center rather than being pulled apart. A piano hinge connects the flanged molding to the panel, enabling the panels to swing open. The flange will be affixed into the door frame by threaded fasteners or other suitable fasteners known to those skilled in the art. The two panels will be secured in the center by a locking pin or other similar fastening device known to those skilled in the art.  
         [0019]     Although preferred embodiments of the invention have been illustrated in the accompanying Drawings and described in the foregoing Detailed Description, it will be understood that the invention is not limited to the embodiments disclosed, but is capable of numerous rearrangements, modifications, and substitutions of parts and elements without departing from the spirit of the invention.