[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

WO1985003771A1 - A platform scale - Google Patents

A platform scale Download PDF

Info

Publication number
WO1985003771A1
WO1985003771A1 PCT/GB1985/000069 GB8500069W WO8503771A1 WO 1985003771 A1 WO1985003771 A1 WO 1985003771A1 GB 8500069 W GB8500069 W GB 8500069W WO 8503771 A1 WO8503771 A1 WO 8503771A1
Authority
WO
WIPO (PCT)
Prior art keywords
platform
lever
scale according
platform scale
bearing
Prior art date
Application number
PCT/GB1985/000069
Other languages
French (fr)
Inventor
Stan Benzies Hanssen
Original Assignee
Tricolor Corporation
Johnson, Terence, Leslie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tricolor Corporation, Johnson, Terence, Leslie filed Critical Tricolor Corporation
Publication of WO1985003771A1 publication Critical patent/WO1985003771A1/en

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G19/00Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/44Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G21/00Details of weighing apparatus
    • G01G21/02Arrangements of bearings
    • G01G21/04Arrangements of bearings of knife-edge bearings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G21/00Details of weighing apparatus
    • G01G21/18Link connections between the beam and the weigh pan
    • G01G21/182Link connections between the beam and the weigh pan using knife-edge bearings
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G21/00Details of weighing apparatus
    • G01G21/23Support or suspension of weighing platforms
    • G01G21/235Support or suspension of weighing platforms using knife-edge bearings

Definitions

  • the invention relates to a platform scale, particularly of the personal weighing scale kind.
  • Platform scales particularly personal weighing scales such as bathroom scales often include a lever system and an internal calibrating support to provide accuracy in weighing with lightness and strength in construction.
  • the lever system or at least the individual levers thereof are often used in combination with knife-edge hangers. These hangers are expensive to manufacture .and complicated to install. *
  • a platform scale comprising a base, for receiving a weight, supported over the base, and weight sensing means including a plurality of levers supported on the base and providing support for the platform, wherein there is adjacent an end of each lever adjacent the periphery of the base a support device between the platform and the respective lever pro'v ding a knife edge bearing for that lever and relative rotational movement between the platform and the lever.
  • each support device may be captive between the platform and respective lever and is maintained in position by the lever.
  • Each support device may comprise a substantially planar member having a part for bearing on a bearing part of the platform, the knife edge being opposite the bearing part.
  • the bearing part of the platform may comprise a depression in the platform which extends below (in use) the plane thereof.
  • the depression may be elongate and and with a curved profile as considered in transverse cross-section.
  • the part of the device which may bear on the profile may be an edge of the device.
  • the support device may have projecting support limbs which engage the underside of the platform, in use.
  • the liirfas may project in opposite directions out of the plane of the device.
  • the knife edge may have an apex angle of 60° .
  • Figure 1 is an exploded perspective view of the scale showing the mechanism thereof according to the invention
  • Figure 2 is an enlarged schematic and elevational view of part of the inner surface of Figure 1;
  • Figure 3 is an enlarged side elevational view of the part shown in Figure 2.
  • a platform scale embodying the invention has a platform 1 and a base 2 which has an upstanding rim 3 > the platform 1 having a dependent rim or skirt la which in use surrounds the rim 3 to provide a neat appearance.
  • the base 2 includes weight sensing means including primary and secondary levers the primary levers 4 and 5 being secured to a corrmon plate 6 of a calibrating device to form a V-shaped single lever.
  • the secondary levers 7 and 8 hang from respective primary levers 4 and 5 from hangers 9 «
  • a dial or mask (part shown) is mounted on a splined spindle 10 so that when that spindle 10 is rotated on deflection of the levers 4,5 and 7.
  • Each lever 4 and 5j6 and 7 is, in the embodiment shown, stamped from a sheet metal plate and is supported upright adjacent one end on the rim 3 of the base 2 at a knife edge. Adjacent the periphery of the base 2 at a position inwards from the rim 3 each lever 4.5j or 7 supports the platform 1 via a support device 12 between the platform 1 and the respective lever 4 . 5 . 6 and 7.
  • Each support device 12 is made from a blank sheet of metal and comprises a substantially planar member 13 which is symmetrical about a centre line and has oppositely directed limbs 14 and 15 which in use bear on the underside of the platform 1, as considered in use and as shown in Figs 2 and 3-
  • the planar member 13 has a notch or slot 16 terminating in a knife edge 17 of 60° apex angle for bearing on the lever 8, and opposite the knife edge 17 a flat part of surface 18 which is an edge of the device and bears on a bearing part 19 of the platform 1.
  • the bearing part 19 of the platform 1 comprises an elongate depression which is downwardly directed (in use) and has a substantially circular surface profile or configuration so that it has a rolling point contact with the bearing part 18 of the support device 12.
  • each lever 4 . 5*7.8 is positioned as required and each one has a bearing support device 12 supported on it before the scale platform 1 is placed in position, with the four depressions 19 bearing respectively on the four bearing parts 18 of the respective support devices 12.
  • a simple cover or decorative panel on the upper (in use) surface of the platform 1 conceals the depressions 19, which do not in any way detract from the comfort of a user of the scale.
  • the depressions 19 and their associated bearing devices 12 nevertheless accommodate any uneven loading of the platform by the depressions 19 or the planar bearing parts 18 "rolling" or rotating with respect to one another, so maintaining the knife edge 17 in the desired relationship to its respective lever, so that the calibration of the scale is not thrown out of true.
  • the scale thus provides an accurate weight measurement even when the loading applied is asymmetric, in other words the scale can accommodate small or different inclinations or cants of the platform 1 with respect to the base 2 in use.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

A platform scale (1, 2) has weight sensing levers (4, 5) and (7, 8) which each supports a platform (1) via a support device (12) which has a substantially planar member (13) symmetrical about a centre line and which has oppositely directed limbs (14 and 15) which bear on the underside of the platform (1). A dimple (19) in the platform bears on the planar member (13) so that the device (12) as a whole provides relative rotational movement betweeen the platform and the respective lever (4, 5, 6 or 7).

Description

A PLATFORM SCALE
TECHNICAL FIELD
The invention relates to a platform scale, particularly of the personal weighing scale kind.
BACKGROUND ART
Platform scales particularly personal weighing scales such as bathroom scales often include a lever system and an internal calibrating support to provide accuracy in weighing with lightness and strength in construction. In order to provide for the accuracy of weighing, in particular, the lever system, or at least the individual levers thereof are often used in combination with knife-edge hangers. These hangers are expensive to manufacture .and complicated to install. *
DISCLOSURE OF THE INVENTION
It is accordingly an object of the invention to seek to mitigate the disadvantage of the prior art.
According to the invention there is provided a platform scale comprising a base, for receiving a weight, supported over the base, and weight sensing means including a plurality of levers supported on the base and providing support for the platform, wherein there is adjacent an end of each lever adjacent the periphery of the base a support device between the platform and the respective lever pro'v ding a knife edge bearing for that lever and relative rotational movement between the platform and the lever.
Using the invention it is possible to provide a unitary support device which extends between the lever and the platform. Preferably each support device may be captive between the platform and respective lever and is maintained in position by the lever.
Each support device may comprise a substantially planar member having a part for bearing on a bearing part of the platform, the knife edge being opposite the bearing part.
The bearing part of the platform may comprise a depression in the platform which extends below (in use) the plane thereof.
The depression may be elongate and and with a curved profile as considered in transverse cross-section.
The part of the device which may bear on the profile may be an edge of the device.
The support device may have projecting support limbs which engage the underside of the platform, in use.
The liirfas may project in opposite directions out of the plane of the device.
The knife edge may have an apex angle of 60° .
A part of a personal weighing platform scale embodying the invention is hereinafter described, by way of example, with reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an exploded perspective view of the scale showing the mechanism thereof according to the invention;
Figure 2 is an enlarged schematic and elevational view of part of the inner surface of Figure 1; and
Figure imgf000004_0001
Figure 3 is an enlarged side elevational view of the part shown in Figure 2.
Referring to the drawings, first of all, a platform scale embodying the invention has a platform 1 and a base 2 which has an upstanding rim 3> the platform 1 having a dependent rim or skirt la which in use surrounds the rim 3 to provide a neat appearance. The base 2 includes weight sensing means including primary and secondary levers the primary levers 4 and 5 being secured to a corrmon plate 6 of a calibrating device to form a V-shaped single lever. The secondary levers 7 and 8 hang from respective primary levers 4 and 5 from hangers 9« A dial or mask (part shown) is mounted on a splined spindle 10 so that when that spindle 10 is rotated on deflection of the levers 4,5 and 7. 8 via a rack 11, the splined spindle 10, rack 11 and V-shaped single lever 4,6,5 forming part of a weight indicating mechanism, either a dial or numerical read-out of weight applied to the platform 1 can be read off through a viewing window of the platform 1. It will be appreciated that as the weight indicating mechanism 4?6,5 and calibrating device are known, and form no part of the invention, they will not be referred to in greater detail.
Each lever 4 and 5j6 and 7 is, in the embodiment shown, stamped from a sheet metal plate and is supported upright adjacent one end on the rim 3 of the base 2 at a knife edge. Adjacent the periphery of the base 2 at a position inwards from the rim 3 each lever 4.5j or 7 supports the platform 1 via a support device 12 between the platform 1 and the respective lever 4.5.6 and 7.
Each support device 12 is made from a blank sheet of metal and comprises a substantially planar member 13 which is symmetrical about a centre line and has oppositely directed limbs 14 and 15 which in use bear on the underside of the platform 1, as considered in use and as shown in Figs 2 and 3- The planar member 13 has a notch or slot 16 terminating in a knife edge 17 of 60° apex angle for bearing on the lever 8, and opposite the knife edge 17 a flat part of surface 18 which is an edge of the device and bears on a bearing part 19 of the platform 1. The bearing part 19 of the platform 1 comprises an elongate depression which is downwardly directed (in use) and has a substantially circular surface profile or configuration so that it has a rolling point contact with the bearing part 18 of the support device 12.
There are four depressions 19 at each corner area of the platform 1 and they are formed therein during fabrication in a relatively single forming step such as pressing or stamping. To assemble the scale each lever 4.5*7.8 is positioned as required and each one has a bearing support device 12 supported on it before the scale platform 1 is placed in position, with the four depressions 19 bearing respectively on the four bearing parts 18 of the respective support devices 12. A simple cover or decorative panel on the upper (in use) surface of the platform 1 conceals the depressions 19, which do not in any way detract from the comfort of a user of the scale. The depressions 19 and their associated bearing devices 12 nevertheless accommodate any uneven loading of the platform by the depressions 19 or the planar bearing parts 18 "rolling" or rotating with respect to one another, so maintaining the knife edge 17 in the desired relationship to its respective lever, so that the calibration of the scale is not thrown out of true. The scale thus provides an accurate weight measurement even when the loading applied is asymmetric, in other words the scale can accommodate small or different inclinations or cants of the platform 1 with respect to the base 2 in use.
Figure imgf000006_0001

Claims

1. A platform scale comprising a base, for receiving a weight, supported over the base, and weight sensing means including a plurality of levers supported on the base and providing support for the platform, wherein there is adjacent an end of each lever adjacent the periphery of the base a support device between the platform and the respective lever providing a knife edge bearing for that lever and relative rotational movement between the platform and the lever.
2. A platform scale according to Claim 1, in which each platform support device is captive between the platform and the respective lever and is maintained in position by the lever.
3. A platform scale according to Claim 1 or Claim 2, in which each support device comprises a substantially planar member having a part for bearing on a bearing part of the platform, the knife edge being opposite the bearing part.
4- A platform scale according to Claim 3, the bearing part of the platform comprising a depression in the platform which extends below (in use) the plane thereof.
5.' A platform scale according to Claim 4-, the depression being elongate and and with a curved profile as considered in transverse cross-section.
6. A platform scale according to Claim 5. the part of the device bearing on the profile being an edge of the device.
7- A platform scale according to any of Claims 3 to 6, the support device having projecting support limbs which engage the underside of the platform, in use.
8. A platform scale according to Claim 7. the limbs projecting in opposite directions out of the plane of the device.
9. A platform scale according to any preceding claim, the knife edge having an apex angle of 60°.
10. A platform scale, substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
Figure imgf000008_0001
PCT/GB1985/000069 1984-02-21 1985-02-19 A platform scale WO1985003771A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8404523 1984-02-21
GB08404523A GB2154755B (en) 1984-02-21 1984-02-21 A platform scale

Publications (1)

Publication Number Publication Date
WO1985003771A1 true WO1985003771A1 (en) 1985-08-29

Family

ID=10556949

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1985/000069 WO1985003771A1 (en) 1984-02-21 1985-02-19 A platform scale

Country Status (3)

Country Link
AU (1) AU3991185A (en)
GB (1) GB2154755B (en)
WO (1) WO1985003771A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554102A1 (en) * 1992-01-29 1993-08-04 Hanson Industries Limited A platform scale
EP1026484A1 (en) * 1999-02-03 2000-08-09 Hanson Industries Incorporated A platform scale

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173299A (en) * 1966-12-06 1969-12-03 Hollands & Blair Ltd Platform Scale
GB1268282A (en) * 1969-06-09 1972-03-29 Brearley Co Bell-crank lever
FR2174836A1 (en) * 1972-03-08 1973-10-19 Ek Bengt
DE2364293A1 (en) * 1973-12-22 1975-06-26 Stube Fa Richard Bathroom scale with frame having levers - which are at four corners operating against a resetting force and supporting a platform
GB2119937A (en) * 1982-04-27 1983-11-23 Stan Benzies Hanssen A platform scale

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB300332A (en) * 1927-08-26 1928-11-15 Avery Ltd W & T Improvements in or relating to platform weighing machines
GB299970A (en) * 1927-09-30 1928-11-08 Avery Ltd W & T Improvements in or relating to platform weighing machines
GB357340A (en) * 1930-08-15 1931-09-24 Mij Exploitatie Octrooien Nv Improvements in or relating to weighing apparatus
GB384227A (en) * 1932-07-02 1932-12-01 Samuel Ashworth Improvements in and relating to weighing machines
GB498161A (en) * 1937-08-13 1939-01-04 Ashworth Ross & Company Ltd Improvements in bearing mountings for weighing levers
GB691138A (en) * 1951-01-06 1953-05-06 Avery Ltd W & T Improvements connected with platform weighing machines
US3134451A (en) * 1962-03-14 1964-05-26 Hanson Scale Co Platform type bathroom scale

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1173299A (en) * 1966-12-06 1969-12-03 Hollands & Blair Ltd Platform Scale
GB1268282A (en) * 1969-06-09 1972-03-29 Brearley Co Bell-crank lever
FR2174836A1 (en) * 1972-03-08 1973-10-19 Ek Bengt
DE2364293A1 (en) * 1973-12-22 1975-06-26 Stube Fa Richard Bathroom scale with frame having levers - which are at four corners operating against a resetting force and supporting a platform
GB2119937A (en) * 1982-04-27 1983-11-23 Stan Benzies Hanssen A platform scale

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0554102A1 (en) * 1992-01-29 1993-08-04 Hanson Industries Limited A platform scale
EP1026484A1 (en) * 1999-02-03 2000-08-09 Hanson Industries Incorporated A platform scale

Also Published As

Publication number Publication date
AU3991185A (en) 1985-09-10
GB2154755B (en) 1987-11-18
GB8404523D0 (en) 1984-03-28
GB2154755A (en) 1985-09-11

Similar Documents

Publication Publication Date Title
US3134451A (en) Platform type bathroom scale
US4433741A (en) Strain gage scale
US3193034A (en) Weighing scale
EP0377941A2 (en) Scale
WO1985003771A1 (en) A platform scale
CA2001803A1 (en) Planar load cell
CA2165758C (en) Multiple overload protection for electronic scales
JPH0320740Y2 (en)
US2766038A (en) Scale
US5937371A (en) Inclinometer with dual scales and parallel gauging surfaces
EP0194363A1 (en) Improved rocking scale
EP1026484A1 (en) A platform scale
US4951764A (en) Digital display scale
US4280574A (en) Balance with selectable multiple reading scales
US3844365A (en) Platform-type scale
US3161244A (en) Zeroing device for bathroom type scales
US5801338A (en) Scale bearing insert
JP2576327Y2 (en) Flat type weight sensor
GB2119937A (en) A platform scale
JPH0129544Y2 (en)
EP0554102B1 (en) A platform scale
US4840241A (en) Letter scale with coin counter-balance
US20040200643A1 (en) Balance of precision
US2890036A (en) Letter weighing scales
US3369621A (en) Weighing scale

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): AU DE GB JP SE US

REG Reference to national code

Ref country code: DE

Ref legal event code: 8642