reference will now be made to the drawings wherein like numerals refer to like parts throughout . referring to fig1 a and 1b , one embodiment of a paper roll dispenser assembly 100 is illustrated . as shown , the paper roll dispenser assembly 100 is generally a u - shaped shell 138 comprising a base member 104 , the portion that will attach onto a wall , and a first and second side arm 102 a , 102 b . the first and second side arms 102 a , 102 b extend perpendicularly from the base member 104 . also , the first and second side arms 102 a , 102 b are separated by a first distance 103 . preferably , the arms define a space 101 having a width of the first distance 103 . the first distance 103 is wider than the paper roll 106 so that the paper roll 106 can fit in the space 101 between the first and second side arms 102 a , 102 b and be retained in a manner to be discussed in further detail below . in the preferred embodiment , the shell 138 comprises an upper half shell 141 and a lower half shell 145 . when the upper half shell 141 and the lower half shell 145 are joined , the shell 138 is hollow , making room for a first and second pivot member 108 a , 108 b to protrude perpendicularly from an aperture 127 in the first and second side arms 102 a , 102 b and point toward the center of the space 101 . the pivot members 108 a , 108 b are assembled into the side arms 102 a , 102 b in a manner to be described below . the first and second pivot members 108 a , 108 b are spaced apart a second distance 105 . preferably , the second distance 105 is less than the length of the paper roll 106 so that the paper roll can be held up by the pivoting members 108 a , 108 b . more specifically , the pivoting members 108 a , 108 b will fit inside a cylindrical hollow core 107 around which the paper 109 of the paper roll 106 is wound . in this way , the first and second pivot members 108 a , 108 b support the paper roll 106 . in one embodiment , the shell 138 and the pivot members 108 a , 108 b are made from a lightweight plastic known in the art . it will be appreciated that the overall form of the base member 104 , the first and second arms 102 a , 102 b , and the pivot members 108 a , 108 b can take on a variety of shapes without departing from the spirit of the present invention . [ 0029 ] fig2 illustrates an isometric view of the first pivot member 108 a . it will be appreciated that the second pivot member 108 b shares the same features with the first pivot member 108 a . in the embodiment shown , the pivot member 108 a comprises various thin - walled surfaces . more specifically , the pivot member 108 a comprises a top face 118 which provides a surface for a paper roll 106 to sit in a manner to be discussed in further detail below . a front face 120 extends at an acute angle from the top face 118 so as to provide a surface for the paper roll 106 to push on and bias the pivot member 108 a to thereby induce the pivot member 108 a to pivot in a manner to be discussed in further detail below . also , a first side 114 perpendicularly connects both the top face 118 and the front face 120 . similarly , a second side 116 perpendicularly connects the other side of the top face 118 and the front face 120 . the pivot member 108 a also includes a cavity shield 110 that extends ninety degrees from the top face 118 and from the first and second sides 114 , 116 . this cavity shield 110 performs two functions , both of which will be discussed in further detail below . first , the cavity shield 110 prevents germs and foreign particles from entering the paper roll dispenser 100 through the aperture 127 . second , the cavity shield limits the rotation of the pivoting member 108 a . also , connected to both the first and second sides 114 , 116 is a half - circle protrusion 122 . centered on the protrusion 122 is a cylinder 112 . as is illustrated in fig2 the protrusion 122 is located at the bottom of the pivot member 108 a adjacent the rear surface . in the preferred embodiment , the cylinder 112 is short — approximately twice the thickness of the protrusion 122 . the cylinder 112 provides a means of supporting the pivoting member 108 a when installed into the paper roll dispenser 100 as will be described in greater detail below . more specifically , fig3 a and 3b illustrate the assembly of the first pivot member 108 a into the first side arm 102 a , and also reveal inner features of the pivot member 108 a and the side arm 102 a . it will be appreciated that the second pivot member 108 b is assembled into the second side arm 102 b in the same manner . as shown in fig3 a and 3b , a first support mount 130 is located inside a cavity 121 of the pivoting member 108 a on the bottom interior wall of the first side arm 102 a . the first support mount 130 is a cylindrical outgrowth that defines a lip 131 and a recessed surface 139 . in the preferred embodiment , the end of the first support mount includes a collar 134 . the collar 134 is an extremely short cylinder of a slightly larger diameter than the first support mount 130 . the combination of the first support mount 130 and the collar 134 provide a mechanism of retaining a spring 128 in a manner to be discussed in greater detail below . also located on the bottom interior wall of the first side arm 102 a is a support 124 . the support 124 is a thin , rectangular outgrowth that extends from the bottom surface 191 of the cavity 143 of the side arm 102 almost to the base of the aperture 127 . the support 124 supports the pivoting member 108 a . specifically , the support 124 includes a pair of grooves 140 which are cut to a diameter greater than the diameter of the cylinders 112 . the grooves 140 provide a location to seat the cylinders 112 of the pivoting member 108 a into the support 124 ; thus , the grooves 140 prevent the pivoting member 108 a from dislocating from the support 124 . [ 0035 ] fig3 a and 3b illustrate a second support mount 132 located on the interior wall of the top face 118 of the pivot member 108 a . the second support mount 132 is a cylindrical outgrowth of the same diameter as the first support mount 130 . likewise , the second support mount includes a collar 134 as described above . the combination of the second support mount 132 and the collar 134 provide a means of retaining the spring 128 in a manner to be discussed in greater detail below . as shown in fig3 a and 3b , the cylinders 112 of the pivot member 108 a fit into the grooves 140 atop the supports 124 in a manner that supports the pivot member 108 a . the grooves 140 also permit the pivot member 108 a to pivot around the axis of the cylinder 112 . as shown , the spring 128 further connects the pivot member 108 a to the rest of the side arm 102 a . a first end 133 of the spring 128 attaches to the side arm 102 a by way of the first support mount 130 . preferably , the diameter of the first support mount 130 is larger than the inner diameter of the spring 128 so as to create an interference fit between the spring 128 and the support 130 . similarly , a second end 135 of the spring 128 attaches to the second support mount 132 in the same manner . it should be noted that the collars 134 on the support mounts 130 , 132 further retain the spring 128 . this is because the diameter of the collar 134 is such that it creates a ridge that rides over and holds the ends 133 , 135 of the spring 128 in the recesses 139 to either the pivot member 108 a or the first side arm 102 a . hence , the spring 128 is retained because of the interference force between the spring 128 and the first support mount 130 , and the spring 128 is further retained due to the hold down force that the collar 134 exerts on the spring 128 . advantageously , the force of the collar 134 on the spring 128 provides a rigid attachment for the spring 128 and prevents the spring 128 from shifting excessively when the pivot member 108 a is biased . thus , the paper roll dispenser 100 is robust because the spring 128 is more likely to stay in position and remain functional for the life of the paper roll dispenser 100 . the collar 134 also allows for easy assembly of the paper roll dispenser 100 because , during assembly , the ends 133 , 135 of the spring 128 can be rigidly attached to the spring mounts 130 , 132 , leaving the person assembling the paper roll free to manipulate other features of the paper roll dispenser 100 . as shown in fig3 b , when force is applied to the front face 120 of the pivot member 108 a , the pivot member 108 a pivots toward the inside of the side arm 102 a thereby compressing the spring 128 . then , once the force is removed , the spring 128 force biases the pivot member 108 a outward from the side arm 102 a . the pivot member 108 a rotates outward until the cavity shield 110 makes contact with the wall of the aperture 127 . preferably , the position of the cavity shield 110 stops the pivot member 108 a when the top face 118 of the pivot member 108 a is perpendicular to the plane of the aperture 127 . [ 0040 ] fig4 illustrates the pivot member 108 a assembled into the first side arm 102 a from a vantage point looking directly into the aperture 127 . the pivot member 108 a is shown rotated to a position where it is at rest . as shown , the pivot member 108 a has come to rest because the cavity shield 110 has made contact with the walls of the aperture 127 . also illustrated in fig4 is the cavity shield 110 covering the open portion of the aperture 127 lying above the top face 118 of the pivot member 108 a . the cavity shield inhibits foreign particles from entering the side arm 102 a through the aperture 127 . as is also illustrated in fig2 and 4 , the cavity shield preferably includes portions 126 that extend outward along the side walls 114 , 116 of each of the pivoting members 108 a , 108 b so as to inhibit the entry of foreign particles in the gap between the wall of the apertures 127 and the walls 114 , 116 of the pivoting members 108 a , 108 b . advantageously , by sealing off the aperture 127 , the cavity shields prevent the growth and spread of germs inside the hollow side arm 102 a . thus , the cavity shields reduce the accumulation of waste and germs . ordinarily , the pivot members 108 a , 108 b will be pivoted when the paper roll 106 is inserted and removed . to insert the paper roll 106 , the user can turn the paper roll 106 horizontally and raise the paper roll 106 into the first distance 103 between the two side arms 102 a , 102 b . then , as the paper roll 106 is raised , the paper roll 106 will make contact with the angled front face 120 of the pivot members 108 a , 108 b . this urges the pivot members 108 a , 108 b to retract into the first and second side arms 102 a , 102 b and thereby compress the springs 128 . once the paper roll 106 is centered in the paper roll assembly 100 , the pivot members 108 a , 108 b are then urged outward again by the springs 128 so as to be centered on the hollow core of the paper roll 106 . the springs 128 bias the pivot members 108 a , 108 b into the hollow core of the paper roll 106 such that the paper roll 106 is supported by the pivot members 108 a , 108 b . then , the paper roll 106 is free to turn along its axis and paper can be dispensed . to remove a paper roll 106 from the paper roll dispenser 100 , the user grabs the paper roll 106 and moves it upwards normal to the top face 118 of the pivot members 108 a , 108 b . as the paper roll 106 moves , the bottom of the paper roll 106 contacts the front face 120 of the pivot members 108 a , 108 b , and the pivot members 108 a , 108 b pivot into the side arms 102 a , 102 b in the manner described above . then , when the paper roll 106 clears the pivot members 108 a , 108 b , the pivot members 108 a , 108 b are urged out toward the center of the paper roll dispenser 100 by the springs 128 until the cavity shields 110 make contact with the sides of the aperture 127 in the side arms 102 a , 102 b . advantageously , both the insertion and removal of the paper roll 106 can be achieved using only one hand . hence , people can insert and remove paper rolls 106 easily and quickly , even if they are physically challenged . [ 0043 ] fig5 illustrates another embodiment of the paper roll dispenser 100 . as shown , a spring mount 230 with a collar 234 resides on an inner side wall 229 of the side arm 202 a at a height above the bottom surface 241 of the cavity 243 that is approximately equal to the height of the pivot arm 108 . in this way , the spring 228 extends laterally across the cavity 243 such that the force of the spring in compression and extension is directly exerted against the pivoting member 108 . the use of the retaining spring mount 230 retains the spring in this orientation during operation of the apparatus . the spring 228 connects to the spring mount 230 in the same manner as described above in relation to spring mount 130 . also shown is a pivot member 208 a that is essentially the same as the pivot member 108 a described above . as shown , an opposite end 235 of the spring 228 rests inside a cavity 221 of the pivot member 208 a . it should be noted that all features shown in fig5 are the same structurally and perform the same function as the features described above . the only difference between the configuration shown in fig5 and the configuration shown in fig3 a and 3b is the location of the spring mount 230 and the absence of a spring mount inside the cavity 221 of the pivot member 208 a . this configuration of the paper roll dispenser 100 is advantageous for several reasons . first , the location of the spring mount 230 allows the axis of the spring 228 to remain essentially straight , even when the pivot member 208 a is biased into the side arm 202 a . because the spring 228 remains straight , the forces in the spring 228 are primarily axial forces , and the amount of lateral forces on the spring 228 are minimal . this reduces the chances of the spring 228 dislodging from either the cavity 221 of the pivot member 208 a or the spring mount 230 . thus , this would be a more robust configuration . it should be noted that the spring mount 230 or collar 234 may not be needed inside the cavity 221 for retaining the end 235 of the spring 228 in all implementations . extra retention force may not be needed at the end 235 of the spring 228 because the spring 228 remains essentially straight and has little chance to dislodge from the cavity 221 of the pivoting member 208 a . since no feature , like the spring mount 230 or collar 234 , is needed , the paper roll dispenser 100 is easy to assemble because the spring 228 can be inserted into the cavity 221 without having to retain it further . in this implementation , assembly is simplified through the lack of a retainer . also , this configuration may allow a less stiff spring to be used ; other designs , like the routing of the spring 128 described above , require an overly - stiff spring to prevent the spring from dislodging due to its offset . a less stiff spring means that the user will need less force to insert and remove a paper roll 206 . another advantage is that a shorter spring 228 may be used because the spring mount 230 is closer to the hollow 221 as compared to the spring routing described above . a shorter spring 228 would be a less costly for the manufacturer . the embodiment shown in fig5 would be easier to assemble as well . this is because placing the spring mounts 230 in the position shown in fig5 provides a more accessible location for mounting the spring as compared to the spring mount position described above . assembly time is further reduced if the lower half shell 145 is shaped such that the entire periphery of the aperture 127 is encompassed by the lower half shell 145 . in this instance , assembly would involve the installation of the pivoting members 208 a , 208 b and their corresponding springs 228 into the lower half shell 145 . the springs 228 would be rigidly attached at this point , and the pivoting members 208 a , 208 b would remain in their first position , with the cavity shields making contact with the inside of the lower half shell 145 . then , the upper half shell 141 would be attached to the lower half shell 145 . thus , assembly time is reduced because the person assembling the dispenser would have an not have to hold the pivoting members 208 a , 208 b in a biased position while the upper half shell 141 is attached to the lower half shell 145 . the use of the retainers in both implementations makes the apparatus significantly more robust as the springs are less likely to be dislodged from their desired orientations . assembly is also simplified as the springs can be positioned on one of the retainers and retained in their desired orientation when the other components of the apparatus , such as the pivot arms , are assembled . the springs can then be positioned on the other retainer by simply forcing the spring end over the collar . the use of the retainers also allows for a less strong spring to be used as less biasing is required to prevent the spring from being inadvertently dislodged . the reduced spring bias allows for easier installation and removal of paper rolls particularly by physically challenged persons . although the illustrated embodiments of the present invention have shown , described , and pointed out the fundamental novel features of the invention , as applied to these embodiments , it will be understood that various omissions , substitutions and changes in the form of the detail of the device illustrated may be made by those skilled in the art without departing from the present invention . consequently , the scope of the invention should not be limited to the foregoing description , but should be defined by the appended claims .
an apparatus for holding a roll of paper having a mounting section with two arms extending outward therefrom . each arm is hollow and includes an aperture on the inner surface of the arms . pivoting members are mounted within the arms and are spring biased into a first position where the pivoting members support the roll of paper . the pivoting members includes cavity shields that prevent the entry of debris into the arms and the springs are secured to the pivoting members and the arms so as to inhibit the springs from being dislodged . the pivoting members are further biased such that the pivoting members can be retracted into a second position as a result of a user moving the roll of paper against the pivoting members in a first direction .