Source: https://patents.google.com/patent/US9395234B2/en
Timestamp: 2019-04-19 22:53:00+00:00

Document:
A scale system includes a scale and a base. The scale includes a plurality of feet and a plurality of load cells, wherein each of the plurality of load cells is associated with one of the plurality of feet. The base includes a plate having an upper surface and a lower surface. A plurality of supports extend from the lower surface. Each of the plurality of supports includes a columnar projection.
This application claims the benefit of U.S. Provisional Application Ser. No. 61/733,674 filed Dec. 5, 2012 which application is incorporated herein by reference.
Home healthcare providers, such as nurses and technicians, travel to the homes of patients to perform many different tests, take vital signs, and administer medicines. Accordingly, they must carry the vast majority of their instruments and equipment with them. Those instruments and equipment must also operate under a variety of environmental conditions. In particular, many home healthcare providers carry a basic scale for weighing a patient. Although scales themselves are fairly portable (e.g., a typical bathroom-type scale), their accuracy can be effected by the type of surface on which they are placed during use. For example, on a hard surface (such as a tiled bathroom floor), they are more accurate than if positioned on a carpeted floor (especially deep pile carpet).
Two types of portable scales are typically available in the marketplace. The first type utilizes one or more springs or load cells between an upper plate and a lower plate. As a weight is applied to the upper plate, the distance between the upper and lower plates decreases, which deforms the spring(s) or load cell(s) and a mechanical dial or electronic screen displays the weight. The second type of scale utilizes multiple load cells, typically one associated with each of the scale's feet. One load cell is located between each of the feet and a top plate upon which the weight is applied. These types of scales are extremely accurate, but their accuracy may be adversely affected by forces acting against the individual feet or the top plate. Since each foot is free to deflect towards the top plate independent of the other feet, imbalanced loads may result in inaccurate results. Also, forces acting against the top plate from below, e.g., by carpet pile contacting the plate may also adversely affect accuracy. Prior art solutions to this problem have included increasing the size of the feet, such that they do not penetrate as deeply into the carpet pile. This solution, however, increases unit cost and still may not solve the problems associated with carpet pile contacting the plate. Moreover, the greater surface area of the feet may cause the user to experience an unstable “floating” or sliding feeling if the scale is placed on the carpet pile. This is also why simply laying a flat piece of material (such as plywood) on carpet pile is not desirable. A flat sheet of plywood is not configured to provide the desired stability for using a scale on a carpet.
Other solutions to the above problems regarding the accuracy of scales when used on carpet pile have been attempted. For example, U.S. Pat. No. 4,934,469 to Jackson depicts a scale having first and second projection pads that extend from the bottom plate. These types of pads, however, could only be used on the first type of scale utilized above, which includes a load cell or spring between an upper plate and a lower plate. Although the scale includes projecting pads, these pads are not aligned with the rigid pads that function as feet for the scale. Additionally, the deepest projection pads are about 16 mm in length. Particularly deep carpet pile could still contact the bottom plate, thereby applying an upward force against the bottom of the scale. If the feet are configured to deflect independent of each other and the bottom plate, inaccurate readings would result.
The scale system technology disclosed herein is particularly useful when using a scale on a variety of surfaces, including on thick carpets or rugs. The systems disclosed herein help ensure accurate readings, regardless of the type of surface upon which the scale system is used. This is particularly helpful for home healthcare providers, who often need to perform their tasks on the elderly or infirmed, who may have difficulty ambulating to a room with a hard floor surface. Similarly, scales used in conjunction with computerized health monitoring systems may also benefit from the technologies described herein, since such scales may be located proximate a computer, which may not always be located in a room with a hard floor surface. Accordingly, the scale may be used whether a patient is in a carpeted living room, in a bedroom, or in a tiled bathroom. The technology described herein improves the accuracy of scales that include a load cell associated with independently deflectable feet. Certain benefits may also extend to scales that utilize a single load cell or spring, used in conjunction with scales having two plates that deflect towards each other.
In one aspect, the technology relates to a scale system having: a scale including a plurality of feet and a plurality of load cells, wherein each of the plurality of load cells is associated with one of the plurality of feet; and a base having: a plate having an upper surface and a lower surface; and a plurality of supports extending from the lower surface, wherein each of the plurality of supports includes a columnar projection. In an embodiment, the scale system further includes a plurality of locators on the upper surface, wherein each of the plurality of locators is adapted to contact one of the plurality of feet. In another embodiment, the system includes a plurality of ribs extending from the lower surface. In yet another embodiment, the plate defines a plurality of openings therethrough. In still another embodiment, the scale includes four feet and four load cells, and wherein the base includes four locators and four supports. In other embodiments, each of the plurality of supports includes: an annular projection extending from the lower surface; and a plurality of columnar projections extending from the annular projection.
In another embodiment of the above aspect, the scale system includes an angled ramp connecting the annular projection to at least one of the plurality of ribs. In another embodiment, the angled ramp includes a plurality of ramps. In certain embodiments, a distance from the bottom surface to an end of the columnar projection is at least about 20 mm, at least about 25 mm, or about 27.5 mm. In another embodiment, the columnar projection is adapted to penetrate carpet pile. In yet another embodiment, the scale includes a scale perimeter dimension and the base includes a base perimeter dimension greater than the scale perimeter dimension. In still another embodiment, at least one of the plurality of locators includes a receiver for receiving at least one of the plurality of feet. In other embodiments, the locator includes a resilient element.
In another aspect, the technology relates to a base for a scale having a plurality of feet and a plurality of load cells, wherein each of the plurality of load cells is associated with one of the plurality of feet, the base having: a plate having an upper surface and a lower surface; and a plurality of supports extending from the lower surface, wherein each of the plurality of supports includes a columnar projection. In an embodiment, the case includes a plurality of locators on the upper surface, wherein each of the plurality of locators is adapted to contact one of the plurality of feet. In another embodiment, each of the plurality of supports includes: an annular projection extending from the lower surface; and a plurality of columnar projections extending from the annular projection. In yet another embodiment, the base includes an angled ramp connecting the annular projection to the lower surface. In still another embodiment, the angled ramp includes a plurality of ramps.
The following drawing figures, which form a part of this application, are illustrative of embodiments of systems and methods described below and are not meant to limit the scope of the technology in any manner, which scope shall be based on the claims.
FIGS. 1A-1D are perspective, top, side, and bottom views of a scale base.
FIG. 2 is a partial enlarged side view of a scale base.
FIGS. 3A and 3B are perspective and side views, respectively, of a scale and base system.
FIGS. 4A-4D depict locators for a base.
FIG. 5 depicts a schematic view of a scale and base system.
The technologies described herein are particularly useful for multiple load cell scales that include multiple, independently deflectable legs, and accordingly, are described primarily in the context thereof. However, as the base provides a stable surface upon which to place a scale, any type of scale may be used in conjunction therewith. The improved stability increases the user confidence on the scale, thus enabling the user to stand comfortably, without fear of slipping or falling.
FIGS. 1A-1D depict a base 100 for a scale system. The base 100 includes a generally flat plate 102 having a top surface 104 and a bottom surface 106. A plurality of openings 108 may penetrate the thickness of the plate 102. The openings 108 help reduce weight of the plate 102, as well as the material required to manufacture the plate 102. The openings 108 may be formed when the plate 102 is manufactured (i.e., using an injection molding process) or may be formed subsequent to manufacture (i.e., by drilling). A number of ribs 110 may extend from the bottom surface 106 to provide rigidity to the plate 102. These ribs 110 may be straight 110 a, curved 110 b, or may be of other configurations, as required or desired for a particular application. Ribs need not be utilized if the plate 102 is of sufficient thickness to resist deformation or bending during use.
A number of locators in the form of receivers 112 project from the top surface 104 of the plate 102. The receivers 112 are configured and dimensioned to receive an associated scale foot. The receivers 112 include a raised circular wall 114 surrounding a central recess 116. The wall 114 may be solid or may be penetrated by one or more gaps 118. The central recess 116 may be level with the top surface 104 or may be raised or recessed relative thereto. The receivers 112 may be dimensioned so as to receive snugly the scale feet. This helps ensure that the scale feet stay centered or substantially aligned above supports 120 that extend from the bottom surface 106. The supports 120 may be configured as required or desired for a particular application, and help secure a position of the base when being used on carpet pile (that is, the supports 120 help prevent sliding). In the depicted embodiment, the supports 120 include an annular projection 122 that extends from the bottom surface 106 of the plate 102. Extending from the bottom of the annular projection 122 are a number of columnar projections 124. The columnar projections 124 are sized so as to penetrate carpet pile. Depending on the density of the carpet pile, ends of the columnar projections 124 may be able to contact the more stable portion of the carpet surface to which the pile is bound.
One or more angled ramps 128 extend from an outer surface of the annular projection 122 to a nearby rib 110 b. Alternatively, the ramps 128 may extend to the bottom surface 106. The ramps 128 buttress the associated annular projections 122, thus increasing the stability thereof. The annular projections 122 provide support to the columnar projections 124, enabling the columnar projections 124 to project a considerable distance away from the bottom surface 106 of the plate 102, without losing structural integrity when supporting a load. In some embodiments, the columnar projections 124 extend ½ an inch to two inches from the annular projections 122. In other embodiments, other optimal ranges may be used.
FIG. 2 depicts a partial enlarged side view of the base 200. Here, dimensions of one embodiment of a base 200 are shown. In the depicted embodiment, the central recess 216 is elevated a distance of about 2 mm above the upper surface 204 (the level of the central recess 216 is depicted by line 216′). The circular wall 214 is about 7.5 mm above the central recess 216. Of course, any height may be utilized that is sufficient to hold the scale feet in place. The ribs 210 extend about 10 mm below the bottom surface 206. The bottom surface of the annular projection 222 is another 10 mm below the ribs 210, and the columnar projections 224 terminate about 7 mm further. Accordingly, the distance between the bottom surface 206 and the end of the bottom columnar projection is about 27.5 mm. This significant distance, coupled with the tapering shape of the columnar projections 224, allows the columnar projections 224 to penetrate deep into carpet pile, while maintaining stability of the base. Other total distances from the bottom surface 206 to the end of the columnar projections 224 are contemplated. For example, the total distance may be at least about 20 mm or at least about 25 mm.
FIGS. 3A and 3B depict a scale system 300, including a base 100 and a scale 302. In some embodiments, the base 100 and scale 302 are provided as separate pieces. In other embodiments, the base 100 and scale 302 are connected as a single unit. As can be seen, outer dimensions DB of the base 100 are greater than outer dimensions DS of the scale 302. These dimensions may be both of width and depth of the base 100 and the scale 302, but may also be characterized as the perimeters of the base 100 and the scale 302. Regardless, the larger dimensions of the base 100 prevents carpet pile that may wrap around the base 100 from contacting the scale 302, thus ensuring no adverse effect on the scale 302. The larger dimensions of the base 100 further ensures the scale 302 is securely placed on the base 100, thereby preventing the scale 302 from sliding off the base 100. Although hidden by the circular receivers 112, each of the four scale feet rest within a corresponding receiver 112, thus ensuring that the feet remain aligned with the supports 120. As described in FIGS. 3A and 3B, the top surface 104 of the base 100 is positioned an optimal distance above carpet pile so as to prevent the carpet from adversely interfering with the scale 302. Accordingly, the base 100 is used to ensure that the scale 302 is positioned on an even plane above carpet pile, or other potentially interfering articles in order to allow the scale 302 to deliver accurate readings.
The scale system 300 may also have a locking feature to lock the base 100 to scale 302 or, alternatively, the two components may be permanently attached. For example, in an embodiment, the base 100 and scale 302 are individual pieces, wherein the base 100 includes a locking feature for securing the scale 302 to the base 100 for additional support. The locking feature may be any suitable locking mechanism. For example, in an embodiment the locking feature is comprised of two straps that are used to secure the scale 302 to the base 100. In some embodiments, the straps are made of Velcro and the scale has a corresponding hook that attaches thereto. In other embodiments, the locking feature comprises a clamp, screw, anchors, bolts, or other suitable attachment mechanisms. Accordingly, the locking feature allows a user to selectively lock and release the scale 302 from the base 100. Although straps are discussed above as one example of a locking feature, it is known to one of ordinary skill in the art that other locking features may alternatively be used.
FIGS. 4A-4D depict various embodiments of locators for a scale base 400. The various types of locators aid in positioning a scale, particularly, a foot of a scale, on a plate 402 of the base 400. FIG. 4A depicts a locator in the form of a recess 404 in a top surface 406 of the base 400. The recess 404 may be formed during the molding process (if a plastic base is utilized), or after the molding process. FIG. 4B depicts a locator in the form of a pin or projection 408. The projection 408 may interface with an opening 410 in a scale foot 412. In one embodiment, the projection 408 may be formed of a rigid material (similar to the plate 402 material, for example) while scale foot 412 may include a resilient material (a rubber gasket, for example). The gasket and pin 408 may form a friction connection to keep the scale foot 412 in contact with the base 400, such that the scale and base 400 may be transported as a single unit. In other embodiments, a screw, bolt, or other fastener may be used.
FIG. 4C depicts a locator in the form of a receiver 414, similar to the receivers depicted herein. Here, however, the receiver 414 includes a resilient (e.g., rubber) gasket 416 that may form a friction connection with an outer surface of a scale foot. FIG. 4D depicts a locator in the form of a colored or shaped mark 418 that identifies a location upon which to place a scale foot. Other configurations of locators are contemplated. It may be desirable to align the locators (regardless of the type utilized) with the supports on the underside of the base. This may help to prevent torque on the base, which may result in inaccurate scale readings.
FIG. 5 depicts such an aligned relationship between the various components in a scale and base system 500. The base system 500 includes a scale 502 and a base 504. At least one load cell 506 is located below a top plate 508 and above a foot 510 of the scale 502. Both the load cell 506 and foot 510 are aligned along axis A. The foot 510 rests in a locator, in this case a receiver 512, located on an upper portion of the base 504. The receiver 512 is aligned along axis A with a support 514, which in this case is configured as a single projection. By ensuring alignment of the load cell 506, foot 510, receiver 512, and support 514 along the single axis A, torque forces are reduced or eliminated, thus helping ensure accurate readings from the scale. Of course, alignment is not critical, but may also help prevent feelings of instability on the part of a user as they stand on the scale 502.
Table 1, as shown below, depicts the results of tests performed with and without a base (such as the base 100 described above) on different types of carpeted surfaces. One Control and Tests 1-4 were performed. In the Control, a scale base was not utilized. Instead, a digital scale having four load cells was placed on a plywood base floor. The resulting reading for each test weight is depicted. The test conditions of Tests 1-4 are also depicted. Tests 1 and 3 did not include a scale base during testing, while Tests 2 and 4 did include a base as depicted above. Additional information regarding the surface upon which the scale or scale/base combination was tested is also identified. In Tests 3 and 4, two layers of carpet pad were utilized. As can be seen, use of the base in Tests 2 and 4 greatly improves accuracy of the scale. Test 3 is also particularly illustrative of the problem of using a scale having individually deflectable feet alone on a thick carpeted surface. In that case, the scale registered a load only once in eight trials. Thus, from the test data, it is clear use of a base such as the type depicted herein helps ensure accuracy of the scale being used.
Numerous other changes may be made which will readily suggest themselves to those skilled in the art and which are encompassed in the spirit of the disclosure and as defined in the appended claims. While various embodiments have been described for purposes of this disclosure, various changes and modifications may be made which are well within the scope of the present technology. Numerous other changes may be made which will readily suggest themselves to those skilled in the art and which are encompassed in the spirit of the disclosure and as defined in the claims.
wherein the base and the scale are permanently attached to form a single unit or wherein the scale system further comprises a locking feature for selectively securing the scale to the base.
2. The scale system of claim 1, further comprising a plurality of locators on the upper surface, wherein each of the plurality of locators is adapted to contact one of the plurality of feet.
3. The scale system of claim 2, further comprising a plurality of ribs extending from the lower surface.
4. The scale system of claim 1, wherein the plate defines a plurality of openings therethrough.
5. The scale system of claim 3, wherein the scale comprises four feet and four load cells, and wherein the base comprises four locators and four supports.
a plurality of columnar projections extending from the annular projection.
7. The scale system of claim 6, further comprising an angled ramp connecting the annular projection to at least one of the plurality of ribs.
8. The scale system of claim 7, wherein the angled ramp comprises a plurality of ramps.
9. The scale system of claim 1, wherein a distance from the bottom surface to an end of the columnar projection is selected from at least about 20 mm, at least about 25 mm, and about 27.5mm.
10. The scale system of claim 1, wherein the columnar projection is adapted to penetrate carpet pile.
11. The scale system of claim 1, wherein the scale comprises a scale perimeter dimension and the base comprises a base perimeter dimension greater than the scale perimeter dimension.
12. The scale system of claim 2, wherein at least one of the plurality of locators comprises a receiver for receiving at least one of the plurality of feet.
13. The scale system of claim 2, wherein the locator comprises a resilient element.
14. The scale system of claim 1, wherein the base and the scale are permanently attached to form a single unit.
15. The scale system of claim 1, wherein the scale system comprises a locking feature for selectively securing the scale to the base.
a plurality of supports extending from the lower surface, wherein each of the plurality of supports comprises a columnar projection.
17. The scale system of claim 16, further comprising a plurality of ribs extending from the lower surface.
19. The scale system of claim 18, further comprising an angled ramp connecting the annular projection to at least one of the plurality of ribs.
20. The scale system of claim 16, wherein the columnar projection is adapted to penetrate carpet pile.
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