Abstract:
A utility corner shelf bracket which enables easy installation and removal, which are done quickly and without requiring tools, of a utility corner shelf bracket, and placing a shelf upon it, and which it based on bows which are capable of bending on one plane and durable to loads perpendicular to this plane and a tensioning system which enables adjustment to the wall corner prior to installation and fastening to the wall during installation.

Description:
REFERENCE TO CROSS-RELATED APPLICATION 
     This application is a Continuation-in-Part of PCT/IL2009/001061, filed Nov. 12, 2009. 
     This application claims priority benefits from PCT/IL2009/001061, filed Nov. 12, 2009, which claims priority benefits from U.S. Provisional Application No. 61/117,251, Filed on Nov. 24, 2008, and from U.S. Provisional Application 61/218,948, filed on Jun. 21, 2009, the full disclosures of which are incorporated herein by reference. 
    
    
     FIELD OF THE INVENTION 
     The present invention relates to a shelf bracket, and, more particularly, to a utility corner shelf bracket. 
     BACKGROUND OF THE INVENTION 
     The need for installing shelves at intersections of structure walls or ends of furniture, which form corners, has existed for many generations. Many solutions are based on placing a shelf on a bracket, which has been fixed to the corner walls at the desired height. 
     A corner bracket is described in U.S. Pat. No. 1,325,143 (1919) of Conterio, which is incorporated by reference for all purposes as if fully set forth herein. 
     A shelf assembly and a support bracket are described in U.S. Pat. No. 4,555,082 (1985) of Sack, et al. which is incorporated by reference for all purposes as if fully set forth herein. This solution is supposed to overcome the limitations of previous solutions, including that of Conterio. These limitations also include being assembled of many separate components, whose assembly is expensive and time consuming, while also being aesthetically unpleasant to the sight. 
     However, even the solution of Sack, et al. has its faults, particularly the need for mounting means, such as nails or screws that are partially inserted into a pair of walls that form a corner before the installment of the shelf assembly. 
     None of the prior art devices enable easy installment and removal, which are done quickly and without requiring tools, of a utility corner shelf bracket, upon which a corner shelf is mounted. 
     There is therefore a need for a utility corner shelf bracket which enables easy installation and removal, which are done quickly and without requiring tools, and upon which a shelf can be mounted, and it would be advantageous if additional accessories could be engaged, for the purpose of bearing loads. 
     SUMMARY OF THE INVENTION 
     An embodiment of the present invention is described herein below in which a utility corner shelf bracket can be easily installed and removed, quickly and without requiring tools, and a shelf can be mounted upon it. The utility corner shelf bracket according to the present invention is composed of two external arced elastic bows and an internal arced elastic bow. Upon the external surface of one of the external elastic bows are insertion means and pulling means. Installation of the utility corner shelf bracket according to the present invention is an extremely simple process which includes manual tensioning, similar to tensioning a bow prior to shooting an arrow, placing it where it should be in the corner, releasing the manual tension, and applying pulling force between the bows with the pulling means, causing the insertion means to be inserted into the walls. Afterwards, all that remains to be done is to place a corner shelf on the utility corner shelf bracket. Removal is done by performing similar actions in reverse order. These actions can be performed in a matter of seconds. 
     According to the present invention there is provided a utility corner shelf bracket including: (a) a first bow, the first bow including: (i) two first bow wings; and (ii) a first bow arc, wherein each one of the first bow wings is operatively connected to the first bow arc; (b) at least one nail operatively connected to each one of the first bow wings. 
     According to the present invention the utility corner shelf bracket further includes: (c) a second bow operatively connected to the first bow; and (d) a pulling assembly, having a length, operatively connected to the second bow, wherein an operation of the pulling assembly creates a pulling force on the second bow, and wherein the second bow applies force to the two first bow wings. 
     According to another feature of the present invention the pulling assembly includes: (i) a turnbuckle sleeve; (ii) a central rod, having two ends, wherein one of the ends of the central rod is disposed on the second bow, and wherein one of the ends of the central rod is engaged with the turnbuckle sleeve; and (iii) a screwing rod having two ends wherein one end of the screwing rod is engaged with the turnbuckle sleeve. 
     According to still another feature of the present invention the utility corner shelf bracket further includes: (e) a T rod disposed on the screwing rod; and (f) two side rods wherein each one of the side rods is disposed on the T rod, and wherein rotation of the turnbuckle sleeve changes the length of the pulling assembly. 
     According to still another feature of the present invention the utility corner shelf bracket further includes: (g) two first bow extenders, each one of the two first bow extenders, is disposed on the first bow; and (h) two strengthening ribs each one of the two strengthening ribs is disposed on a different one of the first bow wings. 
     According to the present invention there is provided a utility corner shelf bracket including: (a) a first bow, the first bow including: (i) two first bow wings; and (ii) a first bow arc, wherein each one of the first bow wings is operatively connected to the first bow arc; (b) at least one nail operatively connected to each one of the first bow wings; (c) two pressing handles, wherein each one of the pressing handles is disposed on one of the first bow wings; and (d) a second bow having two ends, wherein each one of the ends of the second bow is disposed on an element of the utility corner shelf bracket selected from a group consisting of a first bow wing, and a pressing handle, wherein the first bow further includes: (ii) a first bow arc, wherein each one of the first bow wings is operatively connected to the first bow arc. 
     According to another feature of the present invention the utility corner shelf bracket further includes: (e) at least one strengthening rib disposed on one of the first bow wings; and (f) at least one hanging device disposed on the second bow, wherein the first bow arc and the second bow are springs, wherein in a free state the first bow arc has a bow arc bending angle of at most ninety degrees and wherein the second bow has bending angle of at least forty degrees. 
     According to still another feature of the present invention the utility corner shelf bracket is a one-piece device. 
     According to still another feature of the present invention the utility corner shelf bracket is made of a polymer. 
     According to still another feature of the present invention the utility corner shelf bracket includes no connection means. 
     According to still another feature of the present invention the utility corner shelf bracket further includes: (c) two second bow extenders, wherein each one of the two second bow extenders is disposed on one of the first bow wings; and (d) two pressing handles wherein each one of the pressing handles is disposed on one of the second bow extenders. 
     According to still another feature of the present invention the utility corner shelf bracket further includes: (e) two first bow extenders, wherein each one of the first bow extenders, is disposed on one of the pressing handles. 
     According to still another feature of the present invention the utility corner shelf bracket further includes: (f) at least two folding grooves at predetermined location on the utility corner shelf bracket for facilitating folding of the utility corner shelf bracket. 
     According to still another feature of the present invention the utility corner shelf bracket further includes: (g) at least one nail protector operatively connected to said first bow wing. 
     According to the present invention there is provided a curtain carrying device including: (a) two utility corner shelf bracket, the utility corner shelf bracket including: (i) a first bow, the first bow including: two first bow wings; and a first bow arc, wherein each one of the first bow wings is operatively connected to the first bow arc; (ii) at least one nail operatively connected to each one of the first bow wings; (iii) a second bow operatively connected to the first bow; (iv) a pulling assembly, having a length, operatively connected to the second bow, wherein an operation of the pulling assembly creates a pulling force on the second bow, and wherein the second bow applies force to the two first bow wings, wherein the pulling assembly includes: a turnbuckle sleeve; a central rod, having two ends, wherein one of the ends of the central rod is disposed on the second bow, and wherein one of the ends of the central rod is engaged with the turnbuckle sleeve; and a screwing rod having two ends wherein one end of the screwing rod is engaged with the turnbuckle sleeve; (v) a T rod disposed on the screwing rod; and (vi) two side rods wherein each one of the side rods is disposed on the T rod, and wherein a rotation of the turnbuckle sleeve changes the length of the pulling assembly; (vii) two first bow extenders, each one of the two first bow extenders, is disposed on the first bow; and (viii) two strengthening ribs each one of the two strengthening ribs is disposed on different one of the first bow wings; (b) two shelves wherein each one of the shelves has at least one shelf wall, and wherein each one of the shelves is disposed on a different one of the utility corner shelf bracket; and (c) at least one curtain rod, wherein the at least one curtain rod is mounted on the two shelves. 
     According to another feature of the present invention the utility corner shelf bracket further including: (i) at least one basket, wherein the at least one basket is disposed on the utility corner shelf bracket. 
     According to the present invention there is provided a method for installing a niche shelf at two corner walls, comprising the stages of: (a) applying force on both of first bow wings of a utility corner shelf bracket, which reduces an angle between both of the first bow wings; (b) placing the utility corner shelf bracket at a desired location, on one of the corner wall; and (c) mounting a corner shelf on the corner shelf bracket. 
     According to another feature of the present invention the method for installing a niche shelf at two corner walls further comprising the stages of: (d) applying force on both of first bow wings of a utility corner shelf bracket, which reduces an angle between both of the first bow wings; (e) placing the utility another corner shelf bracket at a desired location, on another one of the corner wall; (f) mounting a corner shelf on the another corner shelf bracket; and (g) mounting a niche shelf on the two corner shelves. 
     According to still another feature of the present invention each one of the corner shelves includes: (i) a shelf wall; (ii) longitudinal shelf supports, disposed on the shelf wall; and (iii) lateral shelf support; and the niche shelf has longitudinal grooves and lateral grooves. 
     According to the present invention there is provided a process for producing of a utility corner shelf bracket, the process including the stage of: (a) injecting material into a mold, wherein the mold has an internal volume capable for receiving the material wherein the internal volume has a shape of a utility corner shelf bracket, wherein the utility corner shelf bracket includes: (i) a first bow, having a first bow arc, and two first bow wings, wherein each one of the first bow wings is disposed on one of the first bow arc; (ii) at least one nail disposed on each one of the first bow wings; (iii) two pressing handles, wherein each one of the pressing handles is disposed on one of the first bow wings; and (iv) a second bow having two ends, wherein each one of the ends of the second bow is disposed on an element of the utility corner shelf bracket selected from a group consisting of a first bow wing, and a pressing handle, wherein the first bow arc and the second bow has elasticity characteristics, wherein the utility corner shelf bracket is a one-piece device, wherein the utility corner shelf bracket is made of an elastic material, wherein the material is a polymer. 
     Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an isometric schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 2  is a top schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket, installed in a corner wall, according to the present invention. 
         FIG. 3  is an isometric schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket, at a stage prior to installation, according to the present invention. 
         FIG. 4  is a top schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket, in a corner wall, at a stage prior to installation, according to the present invention. 
         FIG. 5  is an isometric schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket, and a shelf, at a stage prior to placing the shelf on the utility corner shelf bracket, according to the present invention. 
         FIG. 6  is a right side schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket, and a shelf, at a stage following placing the shelf on the utility corner shelf bracket, according to the present invention. 
         FIG. 7   a  is a top schematic illustration of an illustrative, exemplary second embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 7   b  is an isometric schematic illustration of an illustrative, exemplary second embodiment of a utility corner shelf bracket, and a shelf, according to the present invention. 
         FIG. 8   a  is a top schematic illustration of an illustrative, exemplary third embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 8   b  is an isometric schematic illustration of an illustrative, exemplary second embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 9   a  is a top schematic illustration of an illustrative, exemplary fourth embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 9   b  is a top schematic illustration of an illustrative, exemplary fourth embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 10   a  is a top schematic illustration of an illustrative, exemplary fifth embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 10   b  is an isometric schematic illustration of an illustrative, exemplary fifth embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 11   a  is a top schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 11   b  is an isometric schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket, according to the present invention. 
         FIG. 11   c  is a top schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket, installed in a corner wall upon which is mounted a shelf, according to the present invention. 
         FIG. 11   d  is an isometric schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket, which is attached to a load, according to the present invention. 
         FIG. 11   e  is an isometric schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket having a protector connector, according to the present invention. 
         FIG. 12   a  is a top schematic illustration of an illustrative, exemplary seventh embodiment of a utility corner shelf bracket, according to the present invention, in open mode. 
         FIG. 12   b  is a top schematic illustration of an illustrative, exemplary seventh embodiment of a utility corner shelf bracket, according to the present invention, in bent mode. 
         FIG. 12   c  is an isometric schematic illustration of an illustrative, exemplary seventh embodiment of a utility corner shelf bracket, according to the present invention, in folded mode. 
         FIG. 13   a  is a front schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket, according to the present invention in folded mode. 
         FIG. 13   b  is a top schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket, according to the present invention, in folded mode. 
         FIG. 13   c  is a top schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket, installed in a corner wall, according to the present invention. 
         FIG. 13   d  is an isometric schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket, at a stage prior to installation, according to the present invention. 
         FIG. 14  is a top schematic illustration of a part of an embodiment of a utility corner shelf bracket, in a corner wall, in two modes, according to the present invention. 
         FIG. 15  is a flow chart that schematically illustrates the stages of a method for installing a utility corner shelf bracket and a shelf at a corner wall, according to the present invention. 
         FIGS. 16   a - 16   c  are top view schematic illustrations of stages of assembling niche shelf between two corner walls, according to the present invention. 
         FIG. 16   d  is a top schematic illustration of a shelf, according to the present invention. 
         FIG. 16   e  is a side view schematic illustration of a shelf, according to the present invention. 
         FIG. 16   f  is an isometric bottom view schematic illustrations of a niche shelf, according to the present invention. 
         FIG. 17   a  is a side view schematic illustration of a shelf, assembled at a wall ceiling corner, according to the present invention. 
         FIG. 17   b  is an isometric view schematic illustration of a curtain carrying device, according to the present invention. 
         FIG. 17   c  is a top view schematic illustration of a curtain carrying device, according to the present invention. 
         FIG. 18   a  is a top view schematic illustration of a utility corner shelf bracket (third embodiment), and two baskets, according to the present invention. 
         FIG. 18   b  is a front view schematic illustration of a utility corner shelf bracket (third embodiment), and two baskets, according to the present invention. 
         FIG. 18   c  is an isometric view schematic illustration of a utility corner shelf bracket, (third embodiment), and two baskets, according to the present invention. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     The present invention is of a utility corner shelf bracket and of a method for its installation with a shelf in a corner wall, and a method of removing them from the corner wall. 
     The principles and operation of a utility corner shelf bracket according to the present invention may be better understood with reference to the drawings and the accompanying description. Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. 
     Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The materials, dimensions, methods, and examples provided herein are illustrative only and are not intended to be limiting. 
     To remove any doubt, note that the manner in which the elements of the present invention are described in the illustrations can be highly detailed, however is not in any way limiting the present illustration, but rather is for the purpose of clarification and furthering understanding. The present invention can be implemented in embodiments that differ from the specification given with regard to the illustration. 
     The following list is a legend of the numbering of the application illustrations:
           11  first bow     11   a  first bow arc     11   b  first bow wing     11   c  first bow extender     11   d  second bow extender     12  second bow     12   a  first end of a second bow     12   b  second end of a second bow     13   a  third bow (of first embodiment)     13   d  third bow (of fourth embodiment)     13   da  third bow first end (of fourth embodiment)     13   db  third bow second end (of fourth embodiment)     13   e  third bow (of fifth embodiment)     13   ea  third bow first end (of fifth embodiment)     13   eb  third bow second end (of fifth embodiment)     14  hinge     15  socket     16  first socket plate     17  second socket plate     18  nail     19  support     20  pulling assembly     21   a  turnbuckle sleeve (of first embodiment)     21   c  turnbuckle sleeve (of second and third and embodiments)     23   a  second screwing rod (of first embodiment)     23   c  second screwing rod (of second, third, and fourth embodiments)     24  first nut     25  second nut     26  tension bolt     27   b  central rod (of second embodiment)     27   c  central rod (of second, third, and fourth embodiments)     28  side rod     29  pivot     30  strengthening rib     31  T rod     32  support rod     33  cap     34  notch     35   a  rear gripping area     35   b  front gripping area     36  pressing handle     37  hanging device     38  nail hole     39  folding groove     40  load     50  nail protector     50   a  protector connector     50   b  protector pin     50   c  first bow wing hole     100   a  utility corner shelf bracket (first embodiment)     100   b  utility corner shelf bracket (second embodiment)     100   c  utility corner shelf bracket (third embodiment)     100   d  utility corner shelf bracket (fourth embodiment)     100   e  utility corner shelf bracket (fifth embodiment)     100   f  utility corner shelf bracket (sixth embodiment)     100   g  utility corner shelf bracket (seventh embodiment)     100   h  utility corner shelf bracket (eighth embodiment)     101  corner wall     102  corner shelf     102   a  longitudinal shelf support     102   b  lateral shelf support     102   c  shelf wall     102   d  shelf hole     103  niche shelf     103   a  longitudinal groove     103   b  lateral groove     104  wall ceiling corner     105  curtain rod     106  basket     107  curtain carrying device       

     When the accompanying description of a specific illustration mentions an element not shown in that illustration or without numbering, its numbering is shown in parentheses, and can be found in one or more other illustrations. 
     Referring now to the drawings,  FIG. 1  is an isometric schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket  100   a , (first embodiment), according to the present invention. 
     The utility corner shelf bracket  100   a  (first embodiment) includes a first bow  11  and a second bow  12 , connected to each other at their ends so as to enable angular movement between their ends around two hinges  14 , one at each end, which form a closed shape from top view. Each hinge  14  is assembled within a socket  15 , which can be an integral part of a first socket plate  16 , which is engaged with an additional socket, which can be an integral part of a second socket plate  17 , while the two first socket plates  16  are disposed near both ends of the first bow  11 , and the two second socket plates  17  are disposed near both ends of the second bow  12 . 
     In another possible embodiment, the sockets are integral parts of the first bow  11  and the second bow  12 . The first bow  11  and second bow  12  have arced shapes, while the center point of the first bow  11  is origin of a Cartesian axis system, whose axes X, Y, and Z, are in directions shown in the present illustration: the X axis is in the direction of the center point of the second bow  12 , the Y axis is to the left, in view from the origin, on a plane parallel to that on which the first bow  11  and second bow  12  are placed so that after assembly to a corner wall ( 101 ), assuming that its walls are vertical, it is essentially a horizontal plane, and the Z axis in this state is vertically downwards. The central part of first bow  11  has a first bow arc  11   a  and two first bow wings  11   b , each of which progresses to one of either end of first bow arc  11   a , and whose shape is planar after assembly to the corner wall ( 101 ), (if the wall is planar), as will be shown in  FIG. 2 . The external side of each first bow wing lib has several nails  18 , which are designated for insertion into the corner wall ( 101 ) after assembly, in order to prevent movement between the utility corner shelf bracket  100   a  (first embodiment), and the corner wall ( 101 ). In order to facilitate the prevention of movement, the external surface of each first bow wing lib can have a high friction coefficient, which can be achieved either by selection of the material and the processing of the surface, or by adding an external layer of a suitable material, such as a layer of rubber. 
     The first bow  11  and second bow  12  can be composed of various materials, such as aluminum, and have a good ability for bending on the XY plane, suitable for manual forces applied on a pulling assembly ( 20 ), while they are durable to loads in the direction of the Z axis which may be applied to the corner shelf  102  while it is mounted upon the utility corner shelf bracket  100   a  (first embodiment). 
     Inwards from the first bow  11  and second bow, is a third bow  13   a , (of the first embodiment), whose ends rest upon two supports  19 , each of which is disposed on the internal side of the first bow  11  for the purpose of transmitting forces from the first bow  11  and second bow  12 , which are generated at a certain point which will be described later on, by the pulling assembly  20 . Note that this form of force transmission from the third bow  13   a , (of the first embodiment), to the first bow  11 , is one viable option of several, and does not limit the present invention in any way. 
     The pulling assembly ( 20 ), one possible structure of which, and whose method of action, will be specified later on, includes a turnbuckle sleeve  21   a , with left and right hand internal threads on both ends, which can be rotated to the left or to the right, for purposes that will be specified later on, around axis X, with the rotation leftward in view from the origin, around axis X, marked in the present illustration with arrow ‘B’. 
       FIG. 2  is a top schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket  100   a  (first embodiment), installed on a corner wall  101 , according to the present invention. 
     In this state, the angle ‘A’ formed between both of the first bow wings lib, equals the angle formed between both walls comprising the corner wall  101 , and the nails  18  are inserted in the walls. In this state, a corner shelf  102  can be placed upon the utility corner shelf bracket  100   a  (first embodiment). The angle ‘A’ is, in most cases, of 90 degrees, however the utility corner shelf bracket  100   a  (first embodiment), can also be installed in other values of this angle. 
     The pulling assembly  20 , which can apply pulling force, is disposed along the X axis, between the second bow  12 , and the third bow  13   a  (of the first embodiment), which applies forces F 3  on the first bow wings lib. This pulling also causes the second bow  12  to apply forces F 4  on the first bow wings lib. These force components fasten the first bow wings lib towards the two walls of the corner wall  101 . 
     The pulling assembly  20 , shown in the illustrations of the present patent application, includes two rods, a first screwing rod  22   a , with external threads in a first direction, and a second screwing rod  23   a , with external threads in a second direction. 
     The two rods are engaged with turnbuckle sleeve  21   a , namely are screwed into turnbuckle sleeve  21   a , which has left and right hand internal threads at both of its ends and ability to rotate left and right around the X axis, as shown by arrow ‘B’. 
     The turnbuckle sleeve  21   a  can be shaped as a cylinder with a closed wall or partial wall, as shown in the illustrations of the present application. 
     The first screwing rod  22   a  is connected to a second bow  12 , and the second screwing rod  23   a  is connected to a third bow  13   a  (of the first embodiment), through a hole in its center, and its location, according to one embodiment, can be adjusted by means of a first nut  24 , and a second nut  25 . In this manner, the operation of the pulling assembly  20 , which is done by means of rotation of the turnbuckle sleeve  21   a , in one direction, changing its length L, results in the first rod  22   a  and the second screwing rod  23   a  moving towards one another, creating the pulling force described above, while rotation in the other direction causes the rods to move away from one another, and the pulling force, is replaced by a pushing force which reverses the directions of forces F 3  and F 4 , thus decreasing the angle ‘A’ between the two first bow wings lib and therefore causing their moving away and the removal of the nails  18  from the walls. 
       FIG. 3  is an isometric schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket  100   a  (first embodiment), at a stage prior to installation, according to the present invention. 
     At this stage, the installing person, who can be without any special expertise, uses both hands to tension the utility corner shelf bracket  100   a  (first embodiment), along the X axis, ensuring that the angle ‘A’ is small enough to bring close to the corner wall  101 . 
       FIG. 4  is a top schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket  100   a  (first embodiment), installed at a corner wall  101 , at a stage prior to installation, according to the present invention. 
     Because angle ‘A’ is sufficiently small, the utility corner shelf bracket  100   a  (first embodiment), can be brought close to the corner wall  101 , as shown in the present illustration, for the purpose of installation. 
       FIG. 5  is an isometric schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket  100   a  (first embodiment), and a corner shelf  102 , at a stage prior to placing the shelf  102  on the utility corner shelf bracket  100 , (first embodiment), according to the present invention. 
       FIG. 6  is a right side schematic illustration of an illustrative, exemplary first embodiment of a utility corner shelf bracket  100   a  (first embodiment), and a corner shelf  102 , at a stage following placing the corner shelf  102  upon the utility corner shelf, according to the present invention. 
     The invention according to the present patent application is not limited to the installation of the utility corner shelf bracket  100   a  (first embodiment), in corners of vertical walls, and it can also be installed, for example, in a corner formed between a wall and a ceiling. 
     A method for installing a utility corner shelf bracket ( 100   a ) (first embodiment), and a corner shelf ( 102 ) at a corner wall includes the stages of:
         providing a utility corner shelf bracket ( 100   a ) (first embodiment)), and a shelf ( 102 );   tensioning the utility corner shelf bracket ( 100   a ) (first embodiment);   turning the turnbuckle sleeve ( 21   a ), until the nails ( 18 ) are sufficiently inserted into the walls; and   placing the corner shelf ( 102 ) upon the utility corner shelf bracket.       

     The method for removing a utility corner shelf bracket ( 100   a ) (first embodiment), and a corner shelf ( 102 ) from a corner wall includes the stages of:
         removing the corner shelf ( 102 ) from the utility corner shelf bracket ( 100   a ) (first embodiment);   turning the turnbuckle sleeve, until reaching extraction of the nails ( 18 ) from the walls; and   removing the utility corner shelf bracket ( 100   a ) (first embodiment) from the corner wall.       

     The following illustrations and the accompanying description specifies additional embodiments. 
     Many of the structural features and qualities typical of the first embodiment also apply to these additional embodiments. Various combinations of structural elements and features mentioned in the present patent application can serve for additional embodiments of the utility corner shelf bracket according to the present invention. 
       FIG. 7   a  is a top schematic illustration of an illustrative, exemplary second embodiment of a utility corner shelf bracket  100   b , according to the present invention. 
     The pulling assembly  20  of the present illustration includes a tension bolt  26 , and a central rod  27   b  (of the second embodiment), which is connected, by means of a pivot  29 , to two side rods  28  in lieu of the third bow ( 13   a ). Each of both ends of the first bow  11  can have the optional addition of a first bow extender lie whose top view shape can be straight, round, etc., and it is designated to increase the area of contact with the corner shelf ( 102 ). 
     The first bow  11  has a first bow arc  11   a  and two first bow wings lib, each of which progresses to one of either end of first bow arc  11   a , and whose shape is planar after assembly to a corner wall ( 101 ) (if the wall is planar). 
       FIG. 7   b  is an isometric schematic illustration of an illustrative, exemplary second embodiment of a utility corner shelf bracket  100   b , and a corner shelf  102 , according to the present invention. Corner shelf  102 , shown in the present illustration, is one of many possible configurations. In this case, its installation is not by means of placing from the top, but rather horizontal insertion upon a utility corner shelf bracket, which is suitable for various embodiments of the utility corner shelf bracket. 
       FIG. 8   a  is a top schematic illustration of an illustrative, exemplary third embodiment of a utility corner shelf bracket  100   c , according to the present invention. 
     The pulling assembly  20  of the present illustration includes a central rod  27   c  (of second, third, and fourth embodiments), a turnbuckle sleeve  21   c  (of second, third, and fourth embodiments), and a second screwing rod  23   c  (of second, third, and fourth embodiments), whose end is connected to a T rod  31 , both of whose ends have shafts which are connected to two side rods  28 , as shown in the illustration. 
     The central part of first bow  11  has a first bow arc  11   a  and two first bow wings  11   b , each of which progresses to one of either end of first bow arc  11   a , and whose shape is planar after assembly to a corner wall ( 101 ) (if the wall is planar). 
     The internal wall of the first bow  11  has at least one support rod  32 , which prevents overextension, and thus protects the user&#39;s fingers. Each first bow wing lib on the internal wall is connected to a strengthening rib  30 , which provides additional resistance to bending and facilitates mounting up to a wall. 
     The first bow extenders lie shown in the present illustration are of another possible top view shape, and as noted, are designated to increase the area of contact with the corner shelf ( 102 ). 
       FIG. 8   b  is an isometric schematic illustration of an illustrative, exemplary second embodiment of a utility corner shelf bracket  100   c , according to the present invention. 
       FIG. 9   a  is a top schematic illustration of an illustrative, exemplary fourth embodiment of a utility corner shelf bracket  100   d , according to the present invention. 
     The fourth embodiment of a utility corner shelf bracket  100   d  has much in common with the third embodiment of a utility corner shelf bracket ( 100   c ). The main difference is that the fourth embodiment of a utility corner shelf bracket  100   d  has a third bow  13   d  (of the fourth embodiment) in lieu of the T rod  31  and support rods  32 . The turnbuckle sleeve  21   c  (of the of second, third, and fourth embodiments), has internal screw threading only on one end. Its other end has free rotational movement around the central rod  27   c  (of the of second, third, and fourth embodiments). The end of the central rod  27   c  has a cap  33  which prevents the turnbuckle sleeve  21   c  from disconnecting from the central rod  27   c . The central rod  27   c  and the cap  33  each have a notch  34  which enables mounting the turnbuckle sleeve  21   c  upon the central rod  27   c.    
     The first bow  11  has a first bow arc  11   a  and two first bow wings lib, each of which progresses to one of either end of first bow arc  11   a , and whose shape is planar after assembly to a corner wall ( 101 ) (if the wall is planar). 
     The fourth embodiment of a utility corner shelf bracket  100   d  has a pulling assembly  20 . 
       FIG. 9   b  is a top schematic illustration of an illustrative, exemplary fourth embodiment of a utility corner shelf bracket  100   d , according to the present invention. The present illustration shows that the third bow  13   d  (of the fourth embodiment) has two ends, the third bow first end  13   da  (of the fourth embodiment), which has a fixed connection to first bow wing lib, while the third bow second end  13   db  (of the fourth embodiment) can be free, as shown in the present illustration, to facilitate initial bending of the first bow  11 . 
       FIG. 10   a  is a top schematic illustration of an illustrative, exemplary fifth embodiment of a utility corner shelf bracket  100   e , according to the present invention. 
     The fifth embodiment of a utility corner shelf bracket  100   e  has a lot in common with the fourth embodiment of a utility corner shelf bracket  100   d . The main difference is that the fifth embodiment of a utility corner shelf bracket  100   e  has no complete first bow  11  and furthermore, both the third bow first end  13   ea  (of the fifth embodiment) and the third bow second end  13   eb  (of the fifth embodiment) of the third bow  13   e  (of the fifth embodiment), have a fixed connection to either first bow wing lib or strengthening rib  30 . Furthermore, in order to facilitate extension, the fifth embodiment of the utility corner shelf bracket  100   e  includes two gripping areas, rear gripping area  35   a  and front gripping area  35   b , which in the case of the present illustration are suitable for insertion of a finger. 
     The fifth embodiment of a utility corner shelf bracket  100   e  has a pulling assembly  20 . 
       FIG. 10   b  is an isometric schematic illustration of an illustrative, exemplary fifth embodiment of a utility corner shelf bracket  100   e , according to the present invention. 
     The present illustration shows that the rear gripping area  35   a  has a large width dimension relative to the width dimension of the second bow  12 . 
       FIG. 11   a  is a top schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket  100   f , according to the present invention. The sixth embodiment of a utility corner shelf bracket  100   f  does not have any pulling assembly and the forces attaching it to the walls come from the elasticity of the first bow  11  and the second bow  12 , which are, for all practical purposes, springs. 
     Compression prior to mounting in a wall corner is done by means of pressing two pressing handles  36 . When the dimensions of the sixth embodiment of a utility corner shelf bracket  100   f  are sufficiently small, the compression can be done with one hand. Likewise, the sixth embodiment of a utility corner shelf bracket  100   f  can also include a hanging device  37 , to which one can, for example, tie a string with a balloon on its end. 
     The second bow  12  has two ends, a first end of a second bow  12   a , and a second end of a second bow  12   b , while each end is disposed directly to the end of each of the two first bow wings lib or to one of the two pressing handles  36 , while both options are acceptable and efficient. 
     The state shown in the present illustration is a free state, namely, there is no influence of any external forces on the utility corner shelf bracket  100   f  (sixth embodiment), and its shape is determined by the equilibrium of the internal elastic forces. 
     The first bow  11 , which is a spring, as noted, is bent in the free state bow arc bending angle ‘C’, the value of which is smaller than 90 degrees, while the second bow  12 , which is also a spring, as noted, is bent at second bow bending angle ‘D’. It has been determined that for the purpose of effective functioning of the utility corner shelf bracket  100   f  (sixth embodiment), the angle ‘D’ must be larger than a value suitable for a given model of utility corner shelf bracket  100   f  according to its structure and its composing materials. A typical value is bending of 40 degrees. 
     The present illustration shows that strengthening ribs  30  can have a suitable shape and dimensions to serve as buffers preventing excessive compression of the sixth embodiment of a utility corner shelf bracket  100   f . The sixth embodiment of a utility corner shelf bracket  100   f  can be composed of a single part and of a single material, without any moving parts, namely without any hinges or the like, and it can be manufactured in an injection process, without any connection means such as adhesives, welding, screws, etc. between its various parts. 
     Good materials for the production of a sixth embodiment of a utility corner shelf bracket  100   f  can be selected from the group of polymers. 
       FIG. 11   b  is an isometric schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket  100   f , according to the present invention. 
       FIG. 11   c  is a top schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket  100   f , installed in a corner wall  101  upon which is mounted a corner shelf  102 , according to the present invention. 
     Corner shelf  102  can be transparent, as shown in the present illustration, or opaque. The corner wall  101  shown in the present illustration has an angle of practically ninety degrees, and the corner shelf bracket  100   f  was mounted into the corner after it was sufficiently compressed from its released mode, and after being placed next to the corner wall  101 , opened and latched into place by means of its elasticity. 
       FIG. 11   d  is an isometric schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket  100   f  which is attached to a load  40 , according to the present invention. 
     Load  40 , in the case of the present illustration, is a string and an attached balloon which is filled with a gas lighter than air so that it floats upwards. Load  40  can also be heavier than air, and can include various different means, such as string, chains, hooks, or connectors for connection to the utility corner shelf bracket  100   f . The connection can be to hanging device  37  as well as to other locations of the utility corner shelf bracket  100   f.    
       FIG. 11   e  is an isometric schematic illustration of an illustrative, exemplary sixth embodiment of a utility corner shelf bracket  100   f  having a nail protector  50 , according to the present invention. 
     In order to reduce the risk of injury from a nail  18 , the utility corner shelf bracket  100   f  can be equipped with nail protectors  50 , one of which is shown in the present illustration. 
     The illustration marks detail F in a circle, which is magnified in the circle on the upper side of the illustration, which also shows the nail protector  50 . 
     Nail protector  50  is connected to first bow wing  11   b  by means of a protector connector  50   a , which is thin relative to the thickness of the first bow wing  11   b , enabling bending and shifting the protector connector  50   a  from an open state, as shown in the present illustration, to a closed state (by rotational movement as indicated by an arrow in the illustration), in which the protector connector  50   a  covers nails  18 . 
     The protector connector  50   a  can also be equipped with a protector pin  50   b , which in a closed state will be inserted into a first bow wing hole  50   c , in which it will be held by forces of friction, until force is applied to release it. 
       FIG. 12   a  is a top schematic illustration of an illustrative, exemplary seventh embodiment of a utility corner shelf bracket  100   g , according to the present invention, in open mode. 
     The main feature of the seventh embodiment of a utility corner shelf bracket  100   g  is its small amount of components, and particularly the absence of the second bow ( 12 ) and pulling assembly ( 20 ). When it is not mounted in a wall corners it can be in a mode in which the first bow  11  is open on one straight plane. 
     The forces attaching the seventh embodiment of a utility corner shelf bracket  100   g  to the walls come from the elasticity of the first bow  11 . The first bow  11  can be made of a flexible metal or plastic material, and the entire seventh embodiment of a utility corner shelf bracket  100   g  can be manufactured as a single integrated unit. 
       FIG. 12   b  is a top schematic illustration of an illustrative, exemplary seventh embodiment of a utility corner shelf bracket  100   g , according to the present invention, in bent mode. 
       FIG. 12   c  is an isometric schematic illustration of an illustrative, exemplary seventh embodiment of a utility corner shelf bracket  100   g , according to the present invention, in bent mode. 
     The pressing handles  36  can be designed to be suitable for convenient use with fingers. 
       FIG. 13   a  is a front schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket  100   h , according to the present invention in folded mode. 
     The eighth embodiment of the utility corner shelf bracket  100   h  can also be made of a flexible plastic material and, when not in use, can be folded into two fiat layers, with the nails ( 18 ) concealed in nail holes  38 , to prevent any risk of injury. 
       FIG. 13   b  is a top schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket  100   h , according to the present invention, in folded mode. 
     The parts of the eighth embodiment of the utility corner shelf bracket  100   h  can also include folding grooves  39 , to facilitate folding. 
     The illustration also shows hanging device  37 , which can also be made of a flexible plastic material. 
       FIG. 13   c  is a top schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket  100   h , installed in a corner wall, according to the present invention. Other than hanging device  37  and the nails  18 , all components of the eighth embodiment of the utility corner shelf bracket  100   h  are one single piece of material with holes and folding grooves. The first bow  11  has a first bow arc  11   a  and two first bow wings lib, each of which progresses to one of either end of first bow arc  11   a.    
       FIG. 13   d  is an isometric schematic illustration of an illustrative, exemplary eighth embodiment of a utility corner shelf bracket  100   h , at a stage prior to installation, according to the present invention. A second bow extender  11   d  is disposed on the end of each first bow wing, a pressing handle  36  is disposed on the end of each second bow extender  11   d , and as an additional option, a first bow extender  11   c  is disposed on the end of each pressing handle  36 . 
     The user presses both pressing handles  36 , and so prepares the eighth embodiment of the utility corner shelf bracket  100   h  for mounting on a wall corner. 
       FIG. 14  is a top schematic illustration of a part of an embodiment of a utility corner shelf bracket, in a corner wall, in two modes, according to the present invention. 
     The present illustration demonstrates how the elasticity of the first bow  11  generates horizontal forces F h  by means of nails  18 . 
     As noted, the illustration shows two modes, in the first the arc radius of the first bow  11  is smaller than that of the second mode. When preparing a utility corner shelf bracket for mounting in a wall corner, an arc with a smaller radius is formed, and afterward the elasticity of the first bow  11  causes this radius to grow. When the nails  18  are inserted into the walls, the radius growth is stopped. As shown in the illustration, the distance of nail  18  from the wall corner depends on the radius. The growth of the radius is stopped by means of the force applied by the wall on the nails  18 , which equals the force on the horizontal plane, in the case shown in the present illustration, applied by nail  18  on the wall, marked here as F h . 
       FIG. 15  is a flow chart that schematically illustrates the stages of a method for installing a utility corner shelf bracket and a shelf at a corner wall, according to the present invention. 
     The method includes the stages:
         applying force on both of first bow wings of a utility corner shelf bracket, which reduces the angle between both of said first bow wings;   placing said utility corner shelf bracket at a desired location, near said corner wall; and   placing a shelf upon said utility corner shelf bracket. These stages are marked in the present illustration as  51 ,  52 , and  53  respectively. Instead of or in addition to stage  53 , a load can be hung on the utility corner shelf bracket.       

     The applying force on both of the first bow wings is performed for each embodiment of the present invention according to its structure, namely by pressure of the fingers on both of the first bow wings or any other structural part of the utility corner shelf bracket, or by transmitting force through the rotation of the turnbuckle sleeve or a screw. 
       FIGS. 16   a - 16   c  are top view schematic illustrations of stages of assembling niche shelf  103  between two corner walls  101 , according to the present invention. 
       FIG. 16   a  shows two utility corner shelf brackets  100   c  (third embodiment), each one is mounted in a corner wall  101 , according to the present invention. 
     The present invention is not limited in any way to use of a utility corner shelf bracket  100   c  (third embodiment), for assembly of a niche shelf  103  between two corner walls  101 , according to the present invention. 
       FIG. 16   b  shows two corner shelves  102 , each of which in the present case has a triangular shape, though other shapes are also possible; after each of both has been mounted on a different utility corner shelf bracket ( 100   c ) (third embodiment), according to the present invention. 
       FIG. 16   c  shows a niche shelf  103  after being placed upon both corner shelves  102 , according to the present invention. 
       FIG. 16   d  is a top schematic illustration of a corner shelf  102 , according to the present invention. 
     Shelf supports  102   a  can be disposed upon a shelf wall  102   c  to support the niche shelf  103 . 
       FIG. 16   e  is a side view schematic illustration of a corner shelf  102 , according to the present invention. 
     The present illustration also shows shelf supports  102   a  disposed upon shelf wall  102   c.    
       FIG. 16   f  is an isometric bottom view schematic illustrations of a niche shelf  103 , according to the present invention. 
     On one side of the niche shelf  103 , which, after mounting the shelf will be the bottom side, longitudinal grooves  103   a  and lateral grooves  103   b  are etched. 
     The longitudinal grooves  103   a  and lateral grooves  103   b  enable breaking the niche shelf  103  to fit to any given desired dimensions, and furthermore can be engaged with the longitudinal shelf supports  102   a  and the lateral shelf supports  102   b , to prevent niche shelf  103  from sliding out of place. 
       FIG. 17   a  is a side view schematic illustration of a corner shelf  102 , assembled at a wall ceiling corner  104 , according to the present invention. 
     Vertically positioned corner shelves  102  have shelf holes  102   d  designated to receive rods, such as a curtain rod  105 . 
     Each corner shelf  102  is mounted on one utility corner shelf bracket, for example, a utility corner shelf bracket ( 100   c ) (third embodiment). 
       FIG. 17   b  is an isometric view schematic illustration of a curtain carrying device  107 , according to the present invention. 
     The curtain carrying device  107  includes two corner shelves  102  and a curtain rod  105 , which can be assembled with a curtain. This enables easily mounting a curtain near a wall and a ceiling. 
       FIG. 17   c  is a top view schematic illustration of a curtain carrying device  107 , according to the present invention. 
     The configuration shown in the present invention has two curtain rods  105 . This device enables hanging two curtains, and likewise more than two curtains can be hung in a similar manner, by use of more than two curtain rods  105 . 
       FIG. 18   a  is a top view schematic illustration of a utility corner shelf bracket  100   c , (third embodiment), and two baskets  106 , according to the present invention. 
     Basket  106  can be connected to a utility corner shelf bracket  100   c  (third embodiment), and to another utility corner shelf bracket according to the present invention, by various methods, such as use of screws, hooks, etc. 
     Baskets  106  can be used to carry various practical items such as fruits, vegetables, etc. 
       FIG. 18   b  is a front view schematic illustration of a utility corner shelf bracket  100   c  (third embodiment), and two baskets  106 , according to the present invention. 
       FIG. 18   c  is an isometric view schematic illustration of a utility corner shelf bracket  100   c  (third embodiment), and two baskets  106 , according to the present invention. 
     While the invention has been described with respect to a limited number of embodiments, it will be appreciated that many variations, modifications and other applications of the invention may be made.