BACKGROUND
The subject matter disclosed herein relates to the field of sheet product dispensing devices.
Previous sheet product dispensing devices include a spindle that defines an axis of rotation for a roll of sheet product. In operation a user pulls the sheet product to draw sheet product off of the roll and out of the dispenser. The force applied by the user rotates the roll. The force applied by the user to affect the rotation of the roll may vary depending on the mass and diameter of the roll.
BRIEF SUMMARY
In an exemplary embodiment, a sheet product dispenser for dispensing a roll of sheet product mounted thereto includes a housing portion and a load inducement portion. The housing portion defines a space operative to receive the roll of sheet product for rotation about an axis to dispense the sheet product. The load inducement portion is operative to induce a frictional force between the roll of sheet product and the load inducement portion during rotation of the roll of sheet product. The load inducement portion includes a guide member, and a load member slidably engaged with the guide member and operative to contact and apply a load to an outer surface of the roll of sheet product.
In another exemplary embodiment, a sheet product dispenser for dispensing a roll of sheet product mounted thereto includes a housing portion and a load inducement portion. The housing portion defines a space operative to receive the roll of sheet product for rotation about an axis to dispense the sheet product. The load inducement portion is operative to contact and apply a load to an outer surface of the roll of sheet product due to a force of gravity.
In a further exemplary embodiment, a method of dispensing a roll of sheet product mounted to a sheet product dispenser includes contacting and applying a load to an outer surface of the roll of sheet product with a load inducement portion of the sheet product dispenser due to a force of gravity. The method also includes rotating the roll of sheet product about an axis within a space defined by a housing portion of the sheet product dispenser to dispense the sheet product.
These and other advantages and features will become more apparent from the following description taken in conjunction with the drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
The subject matter, which is regarded as the invention, is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 illustrates a perspective, partially transparent view of an exemplary embodiment of a sheet product dispenser.
FIG. 2A illustrates a perspective view of a roll of sheet product mounted to the sheet product dispenser of FIG. 1.
FIG. 2B illustrates a perspective view of the roll of sheet product and the sheet product dispenser of FIG. 2A following partial depletion of sheet product from the roll.
FIG. 3A illustrates a side view of the roll of sheet product and the sheet product dispenser of FIG. 2A, where the guide member is partially transparent.
FIG. 3B illustrates a side view of the roll of sheet product and the sheet product dispenser of FIG. 2B, where the guide member is partially transparent.
FIG. 4 illustrates a detailed side view of the arrangement of the load member and the roll of sheet product in Region 4 of FIG. 3A.
FIG. 5 illustrates a side view of an alternate exemplary embodiment of a guide member of a sheet product dispenser and a roll of sheet product.
FIG. 6 illustrates a side view of another alternate exemplary embodiment of a guide member of a sheet product dispenser and a roll of sheet product.
FIGS. 7A and 7B illustrate detailed side views of the arrangement of the load member and the roll of sheet product of FIG. 6.
FIG. 8 illustrates a side view of another alternate exemplary embodiment of a guide member of a sheet product dispenser and a roll of sheet product.
The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawings.
DETAILED DESCRIPTION
Sheet product dispensing devices often include a spindle that provides support for a roll of sheet product that may rotate about an axis of rotation defined by the spindle. In operation, a user withdraws sheet product from the dispenser by drawing the sheet product from the roll. The force applied to the sheet product results in the rotation of the roll about the spindle. When the roll is full or un-depleted, the relatively large mass and outer diameter of the roll may result in an undesirable “overspin” due to inertia as the roll rotates about the spindle and the moment arm of the force applied by the user. The overspin may result in the dispensing of an undesired or unneeded amount of sheet product, which ultimately may result in higher sheet product consumption per usage occasion. Over time, the mass and outer diameter of the roll decreases as users remove more sheet product from the roll. The reduction in mass and the outer diameter of the roll reduces the propensity of overspin responsive to the force that a user may apply to the sheet product to remove sheet product from the dispenser. Thus, a dispenser that is less susceptible to overspin due to a force applied by a user to affect the dispensing of a sheet product as the roll of sheet product is depleted is desired.
The term “sheet products” as used herein is inclusive of natural and/or synthetic cloth or paper sheets. Sheet products may include both woven and non-woven articles. There are a wide variety of nonwoven processes and they can be either wetlaid or drylaid. Some examples include hydroentagled (sometimes called spunlace), DRC (double re-creped), airlaid, spunbond, carded, paper towel, and meltblown sheet products. Further, sheet products may contain fibrous cellulosic materials that may be derived from natural sources, such as wood pulp fibers, as well as other fibrous material characterized by having hydroxyl groups attached to the polymer backbone. These include glass fibers and synthetic fibers modified with hydroxyl groups. Examples of sheet products include, but are not limited to, wipers, napkins, tissues, rolls, towels or other fibrous, film, polymer, or filamentary products.
In general, sheet products are thin in comparison to their length and breadth and exhibit a relatively flat planar configuration and are flexible to permit folding, rolling, stacking, and the like. The sheet product may have perforations extending in lines across its width to separate individual sheets and facilitate separation or tearing of individual sheets from a roll or folded arrangement at discrete intervals. Individual sheets may be sized as desired to accommodate the many uses of the sheet products. For example, perforation lines may be formed every 10 cm, or other defined interval, to define a universally sized sheet. Multiple perforation lines may be provided to allow the user to select the size of sheet depending on the particular need.
FIG. 1 illustrates a perspective, partially transparent view of an exemplary embodiment of a sheet product dispenser (dispenser) 100. The dispenser 100 includes a housing portion 102 that may include a removable or pivotable cover portion 104 that allows access to an internal cavity space defined by the housing portion 102. The cavity space is operative to receive a roll of sheet product (described below) for rotation about an axis. In the illustrated example, the cover portion 104 is merely an example, and may be sized and shaped in any alternate configuration. The dispenser 100 includes a spindle portion 106 that is disposed in the cavity space. The spindle portion 106 is removably mounted and supported at distal ends of the spindle portion 106 by engagement features. In the illustrated embodiment, the spindle portion 106 is mounted to facilitate the rotation of the spindle portion 106 about an axis of rotation defined by the longitudinal axis of the spindle portion. However, in alternate embodiments, the spindle portion 106 may be mounted such that the spindle portion 106 may be impeded from rotation about the longitudinal axis. The illustrated embodiment includes an orifice 108 defined by the housing portion 102. The orifice 108 provides a path for a sheet product (described below) to pass through and thus, be exposed and accessible to a user. A tear bar (not shown) may be arranged proximate to the orifice 108 to facilitate the separation of a portion of the sheet product from a roll of sheet product mounted on the spindle portion 106.
The dispenser 100 includes a load inducement portion 110. The load inducement portion 110 includes a load member 112 and a guide portion that includes guide members 114. The load member 112 is slidably engaged with the guide members 114 such that the load member 112 may slide along a path defined by the guide members 114 due to the force of gravity. The load member 112 includes a contact portion 118 that is operative to contact and apply a load to an outer surface of a roll of sheet product.
FIG. 2A illustrates a perspective view of a roll of sheet product (roll) 202 that is mounted to the dispenser 100. Specifically, the roll 202 is mounted to the spindle portion 106 of the dispenser 100 such that the spindle portion 106 passes through an orifice defined by the roll 202. In the illustrated embodiment, the roll 202 and the load inducement portion 110 are arranged such that a portion of the roll 202 is disposed between the guide members 114. The contact portion 118 of the load member 112 contacts and applies a load to a portion of the outer surface 204 of the roll 202. As discussed above, the load member 112 slidably engages the guide members 114. The force of gravity biases the load member 112 to travel along channels 206 of the guide members 114 in the direction indicated by the arrow 201. The roll 202 impedes the travel of the load member 112 by exerting an opposing force on the load member 112. A frictional force is induced at the points of contact between the outer surface 204 of the roll 202 and the contact portion 118 of the load member 112. The frictional force opposes and affects the force that is applied by a user as the user draws sheet product from the roll 202, thereby rotating the roll 202 about the rotational axis 203 of the roll 202.
FIG. 2B illustrates a perspective view of the roll 202 and the dispenser 100 following partial depletion of sheet product from the roll 202. In this regard, the outer diameter and mass of the roll 202 have decreased following the removal of sheet product from the roll 202 for use by a user. As the outer diameter of the roll 202 is reduced, the load member 112 is driven by the force of gravity along a path defined by channels 206 of the guide members 114. The contact portion 118 remains in contact with and applies the load to the outer surface 204 of the roll 202 while the roll 202 is static (i.e., is not being rotated by a user withdrawing sheet product) and while the roll 202 is rotating.
FIG. 3A illustrates a side view of the roll 202 and the dispenser 100, where the guide member 114 is partially transparent. In this regard, the roll 202 has an outer diameter of d1 and a radius of ½d1. The contact portion 118 of the load member 112 contacts and is impeded by the outer surface 204 of the roll 202.
FIG. 3B illustrates a side view of the roll 202 and the dispenser 100 following partial depletion of sheet product from the roll 202, where the guide member 114 is partially transparent. In comparison to FIG. 3A, the roll 202 has been partially depleted by a user such that the outer diameter of the roll is d2, where d1>d2. The load member 112 has moved along the path defined by the channels 206 while remaining in contact with and applying the load to the outer surface 204 of the roll 202. Thus, as the outer diameter of the roll 202 is reduced, the load member 112 remains in contact with and applies a substantially constant load to the outer surface 204 of the roll 202 due to the force of gravity. In this manner, as the outer diameter of the roll 202 is reduced, the load member 112 induces a substantially constant frictional force between the roll 202 and the load member 112 due to the force of gravity. As used herein, the term “substantially” takes into consideration slight variations that may occur in the coefficient of friction between the load member 112 and the sheet product, such as at a perforation line in the sheet product for example. Other configurations may be employed that result in a change in the load applied by the load member 112 to the roll 202 and thus the frictional force induced between the load member 112 and the outer surface 204 of the roll 202 as the roll 202 is depleted, which are discussed in more detail below in connection with FIGS. 6-8.
FIG. 4 illustrates a detailed side view of the arrangement of the load member 112 and the roll 202 in Region 4 (of FIG. 3A). The line mg represents a vector of the force of gravity acting on the load member 112 where m is the mass of the load member 112 and g is the acceleration due to gravity. The line Fn represents a vector of the normal force exerted by the roll 202 and the load member 112 at the point 401 where the load member 112 contacts the roll 202. The line Ff represents a vector of the force of friction resulting from rotational movement of the roll 202 in the direction indicated by the arrow 402. In this regard, the Ff=μFn where pi is the coefficient of friction of the sheet product on the roll 202 and the contact portion 118 of the load member 112.
The frictional force Ff affects the amount of force a user may use to draw sheet product from the roll 202 and overspin of the roll. In this regard, once allowing for other effective forces, such as, for example, frictional forces on the rotation of the spindle 106 (of FIG. 1) or frictional forces on the rotation of the center of the roll 202 about the spindle 106 (for embodiments where the spindle 106 remains in a fixed orientation as the roll 202 rotates about the spindle 106), the frictional force Ff may be chosen to provide a desired resistance felt by a user as the user draws sheet product from the roll 202. Thus, the mass of the load member 112, and the coefficient of friction may be selected to result in a desired frictional force Ff. The coefficient of friction may be determined in part by the coefficient of friction of the sheet product. The materials used in the contact portion 118 of the load member may also affect the coefficient of friction. The surface of the contact portion 118 may also be smooth, or in some embodiments, may include perturbations, patterns, or ridges that are operative to affect the coefficient of friction. The layers of sheet material on the roll 202 are affected by the normal force Fn and thus have a respective force of friction between them. The frictional force Ff between the outer surface 204 of the roll 202 and the load member 112 may be selected such that the frictional force Ff is not greater than the force of friction between two layers of sheet products on the roll 202 to avoid undesirable unwinding of the roll 202 in the dispenser 100.
FIG. 5 illustrates a side view of an alternate exemplary embodiment of a guide member 514 of the dispenser 100. The guide member 514 has guides 506 that may include, for example, a channel or other feature operative to slidably engage the load member 112. In this regard, the guides 506 are operative to arrange the load member 112 such that the force mg due to gravity is substantially collinear with the normal force Fn. The illustrated embodiment demonstrates how the angle of incidence of the load member 112 on the roll 202 may include any angle operative to affect a desired normal force Fn due to gravity acting on the load member 112. The normal force F,, affects the frictional force Ff according to the equation Ff=
FIG. 6 illustrates a side view of another alternate exemplary embodiment of a guide member 614 of the dispenser 100. The guide member 614 includes guides 606 having a curved profile such that the angle of incidence of the load member 112 relative to the outer surface 204 of the roll 202 changes as the load member 112 follows the path indicated by the arrow 601. In this regard, the angle of incidence is decreased at the position P2 relative to the position P1.
FIGS. 7A and 7B illustrate detailed side views of the arrangement of the load member 112 and the roll 202, showing the operation of the embodiment described above in FIG. 6. In this regard, FIG. 7A illustrates a roll 202 having a diameter d1. The contact portion 118 of the load member 112 is in the position P1 (of FIG. 6). The resultant normal force (Fn1), frictional force (Ff1), and angle (φ1) defined by normal force Fn1 and weight of the member mg are shown. FIG. 7B illustrates the roll 202 having a diameter d2 where d1>d2. The contact portion 118 of the load member 112 is in the position P2 (of FIG. 6). The resultant normal force (Fn2), frictional force (Ff2), and angle (φ2) defined by the normal force Fn2 and weight of the member mg are shown. The angle φ2 is greater than the angle φ1, which results in the normal force Fn1 being greater than the normal force Fn2 and the frictional force Ff1 being greater than the frictional force Ff2. Such a difference in the Ff may be desired to affect the feel experienced by a user when the diameter of the roll 202 is reduced.
FIG. 8 illustrates a side view of another alternate exemplary embodiment of a guide member 814 of the dispenser 100. The guide member 814 includes guides 806 having a curved profile such that the angle of incidence of the load member 112 relative to the outer surface 204 of the roll 202 changes as the load member 112 follows the path indicated by the arrow 801. In this regard, the angle of incidence is increased at the point P2 relative to the point P1. Thus, the resultant Ff at point P1 is less than the Ff at point P2 when the load member 112 contacts the roll 202 at the respective points.
The embodiments of the sheet product dispenser described herein provide an improved configuration for reducing overspin of a roll of sheet product. As described above, the sheet product dispenser includes a load inducement portion operative to contact and apply a load to an outer Surface of the roll of sheet product due to a force of gravity. In this manner, the load inducing portion is operative to induce a frictional force between the roll of sheet product and the load inducement portion during rotation of the roll of sheet product, which reduces overspin. Further, the frictional force generated affects the force applied by a user to dispense sheet product from the roll of sheet product, which may reduce sheet product consumption per usage occasion.
While the invention has been described in detail in connection with only a limited number of embodiments, it should be readily understood that the invention is not limited to such disclosed embodiments. Rather, the invention can be modified to incorporate any number of variations, alterations, substitutions or equivalent arrangements not heretofore described, but which are commensurate with the spirit and scope of the invention. Additionally, while various embodiments of the invention have been described, it is to be understood that aspects of the invention may include only some of the described embodiments. Accordingly, the invention is not to be seen as limited by the foregoing description, but is only limited by the scope of the appended claims.
Patent Application
20130320128
