WO2006113779A1 - Load sensing system for an aerial work apparatus - Google Patents

Load sensing system for an aerial work apparatus Download PDF

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Publication number
WO2006113779A1
WO2006113779A1 PCT/US2006/014699 US2006014699W WO2006113779A1 WO 2006113779 A1 WO2006113779 A1 WO 2006113779A1 US 2006014699 W US2006014699 W US 2006014699W WO 2006113779 A1 WO2006113779 A1 WO 2006113779A1
Authority
WO
WIPO (PCT)
Prior art keywords
support
sensing system
load sensing
load
carriage
Prior art date
Application number
PCT/US2006/014699
Other languages
French (fr)
Inventor
Gregory S. Van Hinsbergh
Edward T. Bottle
Original Assignee
Caterpillar Inc.
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 Caterpillar Inc. filed Critical Caterpillar Inc.
Priority to GB0720582A priority Critical patent/GB2441449B/en
Publication of WO2006113779A1 publication Critical patent/WO2006113779A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/16—Applications of indicating, registering, or weighing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F11/00—Lifting devices specially adapted for particular uses not otherwise provided for
    • B66F11/04—Lifting devices specially adapted for particular uses not otherwise provided for for movable platforms or cabins, e.g. on vehicles, permitting workmen to place themselves in any desired position for carrying out required operations
    • B66F11/044—Working platforms suspended from booms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/006—Safety devices, e.g. for limiting or indicating lifting force for working platforms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/14—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing suspended loads
    • G01G19/18—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing suspended loads having electrical weight-sensitive devices

Definitions

  • the present invention relates to a load sensing system for determining the load on an aerial work apparatus and in particular for measuring the weight of personnel and equipment carried on a platform of the aerial work apparatus.
  • Such work apparatus normally comprises a vehicle having an extendible boom mounted thereon for rotation about a vertical axis and pivotal movement about a horizontal axis.
  • a platform having a raised safety rail therearound is normally mounted on a distal end of the boom, mounted to the boom such that platform remains in a horizontal orientation as the boom is pivotally moved between raised and lowered positions.
  • the platform is usually mounted on the boom via a swivel joint permitting the platform to swivel about a vertical axis with respect to the end of the boom. Hydraulic actuators are normally provided for moving the boom and platform to a required position.
  • a load sensing system for an aerial work apparatus comprising: a support member mountable on a load handling machine; a first support structure having at least one end connectable to the support member; a second structure supported on said first support structure at a location spaced from said at least one end of the first support structure; load determining means for determining the load applied to the first support structure via the second support structure.
  • Fig 1 is a perspective view of an aerial work apparatus according to the present invention.
  • Fig 2 is a perspective view of the aerial work apparatus of Fig 1 with the platform omitted for clarity;
  • Fig 3 is a front view of the apparatus of Fig 2;
  • Fig 4 is a sectional view on line Y-Y shown in Fig 3;
  • Fig 5 is a partial sectional view taken on line X-X shown in Fig 4;
  • Fig 6 is a front view of the apparatus of Fig 2 with the front plate and platform swivel mount omitted.
  • FIG 1 illustrates an aerial work apparatus comprising a platform 10 having a raised safety rail 12 therearound and an access gate 14 on a front side thereof to permit persons and equipment to be loaded onto the platform.
  • the platform 10 is mounted on a carriage 16 via a swivel mount 18 permitting the platform 10 to swivel about a vertical axis.
  • a hydraulic actuator can be provided for controlling pivotal movement of the platform 10 about the swivel mount 18.
  • the carriage 16 is mounted on a support member 20 as will be described in more detail below.
  • the support member 20 has conventional connection members 22,24 provided thereon to enable the support member to be connectable to the distal end of a boom of a telehandler or other load handling vehicle, whereby the platform can be conveyed to an elevated position to permit persons to safely maintain, install or repair equipment located at such elevated position.
  • the carriage 16 is mounted on the support member 20 via parallel, vertically arranged channel members 26,28 respectively provided on adjacent sides of the support member and defining opposed, inwardly facing, U-shaped guide channels.
  • the carriage 16 is provided with guide wheels 30 (see Fig 5) rotatably mounted on the carriage 16 and adapted to run in the channel member 26,28, the guide wheels 20 and channel members 26,26 constraining the carriage to be moveable with respect to the support member in a substantially vertical plane.
  • a support beam 32 is provided on the support member 20, the support beam 32 extending transversely between the channel members 26,28, the distal ends of the support beam 32 being mounted within and secured to the channel members 26,28 such that the support beam 32 is supported on the support member 20 by its ends.
  • a elongate support pin 34 is provided on the carriage 16, extending from the carriage 16 towards the support member 20 to a position wherein the support pin can abut an upper surface of the support beam 32 at a location midway between the ends of the support beam 32, whereby the weight of the carriage 16, platform, and personnel and equipment carried thereon, can be carried by the support beam 32.
  • a rubber sleeve may be provided on the support pin to absorb impacts between the support pin 34 and support beam 32.
  • a load determining means 36 is provided on a lower surface of the support beam 32 in a region beneath the location whereat the support pin 34 abuts the support beam 32.
  • the load determining means is a strain gauge. Due to the arrangement of the support beam 32 and support pin 34, the strain gauge 36 can record the true vertical load, with respect to gravity, applied to the support beam 32 by the support pin 34.
  • the strain gauge 36 can be of the type used to measure the load applied to a vehicle axle.
  • the strain gauge 36 is connectable to conventional load determining means to determine the total weight of persons and equipment carried by the platform 10.
  • stop members 38 are provided within the channel of each channel member 26,28 at a location whereby at least one of the guide wheels 30 on each side of the carriage will abut a stop member 38, such that the stop member 28 support the carriage 16, preventing further downward movement of the carriage, if the loading of the support beam 32 and thus the deflection of the support beam 32 reaches a predetermined limit corresponding to a maximum safe load, thus preventing overloading of the support beam 32, support pin 34 and associated load sensing system.
  • the load determining means includes means for indicating to the user that the safe maximum load has been reached to prevent the user from unknowingly placing further load on the platform once the guide wheels 30 have abutted the stop members 38.
  • the load applied to the support beam 32 of the support member 20 via the support pin 34 of the carriage 16 can be sensed by the strain gauge 36 such that the weight of personnel and equipment carried by the platform 10 can be accurately determined.
  • the strain gauge 36 and associated load determining means can be calibrated during manufacture to record only the weight of the personnel and equipment placed on the platform 10 and provide a zero reading under the weight of the carriage, platform and associated equipment alone.
  • the support member 20, channel members 26,28, carriage 16 and associated upper and lower cover plates 40,42 effectively enclose the support beam 32, support pin 34 and guide rollers 30.
  • the linear movement of the carriage 16 with respect to the support member 20 helps to prevent damage to the platform 10 and load sensing system when the support member is decoupled from a load handing device by permitting the platform 10 to move relative to the support member 20 when the platform contacts the ground.
  • the load sensing system of the present invention has been found to be capable of determining the total weight of personnel and equipment carried by the platform to an accuracy of plus or minus 0.83% and is capable of detecting a load change of 1.25kg without requiring post manufacture calibration.
  • the load sensing system of the present invention could equally be used to determine the weight of a load applied to other load handling equipment, such as fork lifts, elevators etc.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Forklifts And Lifting Vehicles (AREA)

Abstract

According to the present invention there is provided a load sensing system for an aerial work apparatus, the system comprising: a support member (20) mountable on a load handling machine; a first support structure (32) having at least one end connectable to the support member; a second structure (16) supported on said first support structure at a location (34) spaced from said at least one end of the first support structure; load determining means (36) for determining the load applied to the first support structure (32) via the second support structure (34). In one embodiment, the first support structure (34) comprises a transverse beam supported on the support member (20) at its ends, the second support structure comprising a carriage (16) having a support pin (34) resting on a midpoint of the support beam (32).

Description

Description
LOAD SENSING SYSTEM FOR AN AERIAL WORK APPARATUS
Technical Field The present invention relates to a load sensing system for determining the load on an aerial work apparatus and in particular for measuring the weight of personnel and equipment carried on a platform of the aerial work apparatus.
Background Aerial work or access platforms are frequently used to provide access to elevated or otherwise inaccessible work locations whereby persons can safely perform manual tasks, such as maintenance, repair or installation of structures at height. Such work apparatus normally comprises a vehicle having an extendible boom mounted thereon for rotation about a vertical axis and pivotal movement about a horizontal axis.
A platform having a raised safety rail therearound is normally mounted on a distal end of the boom, mounted to the boom such that platform remains in a horizontal orientation as the boom is pivotally moved between raised and lowered positions. The platform is usually mounted on the boom via a swivel joint permitting the platform to swivel about a vertical axis with respect to the end of the boom. Hydraulic actuators are normally provided for moving the boom and platform to a required position.
It is useful to be able to determine an accurate measurement of the weight on the platform. Although attempts have been made in the past to measure the load on the platform, such attempts have been excessively complex and insufficiently accurate. Summary of the Invention
According to the present invention there is provided a load sensing system for an aerial work apparatus, the system comprising: a support member mountable on a load handling machine; a first support structure having at least one end connectable to the support member; a second structure supported on said first support structure at a location spaced from said at least one end of the first support structure; load determining means for determining the load applied to the first support structure via the second support structure.
Brief Description of the Drawings
Fig 1 is a perspective view of an aerial work apparatus according to the present invention;
Fig 2 is a perspective view of the aerial work apparatus of Fig 1 with the platform omitted for clarity;
Fig 3 is a front view of the apparatus of Fig 2;
Fig 4 is a sectional view on line Y-Y shown in Fig 3;
Fig 5 is a partial sectional view taken on line X-X shown in Fig 4;
Fig 6 is a front view of the apparatus of Fig 2 with the front plate and platform swivel mount omitted.
Detailed Description
With reference to Fig 1 there is shown one embodiment of the present invention. Fig 1 illustrates an aerial work apparatus comprising a platform 10 having a raised safety rail 12 therearound and an access gate 14 on a front side thereof to permit persons and equipment to be loaded onto the platform. The platform 10 is mounted on a carriage 16 via a swivel mount 18 permitting the platform 10 to swivel about a vertical axis. A hydraulic actuator can be provided for controlling pivotal movement of the platform 10 about the swivel mount 18.
The carriage 16 is mounted on a support member 20 as will be described in more detail below. The support member 20 has conventional connection members 22,24 provided thereon to enable the support member to be connectable to the distal end of a boom of a telehandler or other load handling vehicle, whereby the platform can be conveyed to an elevated position to permit persons to safely maintain, install or repair equipment located at such elevated position. With reference to Figs 2 to 5, the carriage 16 is mounted on the support member 20 via parallel, vertically arranged channel members 26,28 respectively provided on adjacent sides of the support member and defining opposed, inwardly facing, U-shaped guide channels. The carriage 16 is provided with guide wheels 30 (see Fig 5) rotatably mounted on the carriage 16 and adapted to run in the channel member 26,28, the guide wheels 20 and channel members 26,26 constraining the carriage to be moveable with respect to the support member in a substantially vertical plane.
As can be see in Fig 6, a support beam 32 is provided on the support member 20, the support beam 32 extending transversely between the channel members 26,28, the distal ends of the support beam 32 being mounted within and secured to the channel members 26,28 such that the support beam 32 is supported on the support member 20 by its ends.
A elongate support pin 34 is provided on the carriage 16, extending from the carriage 16 towards the support member 20 to a position wherein the support pin can abut an upper surface of the support beam 32 at a location midway between the ends of the support beam 32, whereby the weight of the carriage 16, platform, and personnel and equipment carried thereon, can be carried by the support beam 32. A rubber sleeve may be provided on the support pin to absorb impacts between the support pin 34 and support beam 32. In order to determine the load applied to the support beam 32 by the support pin 34, a load determining means 36 is provided on a lower surface of the support beam 32 in a region beneath the location whereat the support pin 34 abuts the support beam 32. In one embodiment the load determining means is a strain gauge. Due to the arrangement of the support beam 32 and support pin 34, the strain gauge 36 can record the true vertical load, with respect to gravity, applied to the support beam 32 by the support pin 34. The strain gauge 36 can be of the type used to measure the load applied to a vehicle axle.
The strain gauge 36 is connectable to conventional load determining means to determine the total weight of persons and equipment carried by the platform 10.
In order to prevent overloading of the support beam 32, stop members 38 (Fig 4) are provided within the channel of each channel member 26,28 at a location whereby at least one of the guide wheels 30 on each side of the carriage will abut a stop member 38, such that the stop member 28 support the carriage 16, preventing further downward movement of the carriage, if the loading of the support beam 32 and thus the deflection of the support beam 32 reaches a predetermined limit corresponding to a maximum safe load, thus preventing overloading of the support beam 32, support pin 34 and associated load sensing system.
Such stop members 38 will also arrest the carriage if the support beam 32 and/or the support pin 34 fail. Preferably the load determining means includes means for indicating to the user that the safe maximum load has been reached to prevent the user from unknowingly placing further load on the platform once the guide wheels 30 have abutted the stop members 38.
Industrial Applicability
In use, the load applied to the support beam 32 of the support member 20 via the support pin 34 of the carriage 16 can be sensed by the strain gauge 36 such that the weight of personnel and equipment carried by the platform 10 can be accurately determined.
The strain gauge 36 and associated load determining means can be calibrated during manufacture to record only the weight of the personnel and equipment placed on the platform 10 and provide a zero reading under the weight of the carriage, platform and associated equipment alone.
The support member 20, channel members 26,28, carriage 16 and associated upper and lower cover plates 40,42 effectively enclose the support beam 32, support pin 34 and guide rollers 30. The linear movement of the carriage 16 with respect to the support member 20 helps to prevent damage to the platform 10 and load sensing system when the support member is decoupled from a load handing device by permitting the platform 10 to move relative to the support member 20 when the platform contacts the ground. The load sensing system of the present invention has been found to be capable of determining the total weight of personnel and equipment carried by the platform to an accuracy of plus or minus 0.83% and is capable of detecting a load change of 1.25kg without requiring post manufacture calibration.
Whilst the preferred embodiment is described in terms of a load sensing system for an aerial work apparatus, it is envisaged that the load sensing system of the present invention could equally be used to determine the weight of a load applied to other load handling equipment, such as fork lifts, elevators etc.

Claims

Claims
1. A load sensing system for an aerial work apparatus, the system comprising: a support member mountable on a load handling machine; a first support structure having at least one end connectable to the support member; a second structure supported on said first support structure at a location spaced from said at least one end of the first support structure; load determining means for determining the load applied to the first support structure via the second support structure.
2. A load sensing system according to claim 1 , wherein the first support structure comprises a transversely extending support beam or bar having at least one end mounted on the support member.
3. A load sensing system according to claim 2, wherein the support beam extends transversely between first and second sides of the support member, the support beam being mounted at its ends on the first and second sides of the support member.
4. A load sensing system as claimed in claim 3, wherein the second support structure includes an elongate member engaging the support beam at a location approximately midway between the ends of the support beam.
5. A load sensing system of claim 4, wherein the elongate member is located to abut an upper surface of the support beam to support the second support structure on the support beam.
6. A load sensing system as claimed in any preceding claim, wherein the load determining means comprises at least one strain gauge provided on a surface of the first support member.
7. A load sensing system as claimed in any preceding claim, wherein the support member includes guide rail means, the second support structure comprising a carriage including guide rail engaging means whereby the carriage is constrained to move in a vertical plane with respect to the support member.
8. A load sensing system as claimed in claim 7, wherein the guide rail means comprise a pair of opposed inwardly facing U shaped channels, the guide rail engaging means comprising rollers or wheels mounted on the carriage to run within the channels.
9. A load sensing system as claimed in claim 8, wherein stop means are provided within each channel at a position to engage the guide rail engaging means of the carriage, arresting the carriage, if the support beam fails and/or the deflection of the support beam exceeds a predetermined amount to prevent overloading of the load sensing system.
10. A load sensing system as claimed in claim 9, wherein the carriage includes means for mounting a working platform thereon.
11. A load sensing system as claimed in claim 10, wherein the mounting means comprises a swivel mounting to permit rotation of the carriage about a vertical axis.
PCT/US2006/014699 2005-04-20 2006-04-19 Load sensing system for an aerial work apparatus WO2006113779A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0720582A GB2441449B (en) 2005-04-20 2006-04-19 Load sensing system for an aerial work apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0507972.8A GB0507972D0 (en) 2005-04-20 2005-04-20 Load sensing system for an aerial work apparatus
GB0507972.8 2005-04-20

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101780934A (en) * 2010-02-26 2010-07-21 南京晨光水山电液特装有限公司 High-altitude operation slot load measuring device
WO2010118481A3 (en) * 2009-04-17 2010-12-02 Allenbroer Leo Alix De Lille Multifunctional basket with improved properties
EP2221271A3 (en) * 2009-02-18 2011-03-02 Boliden Mekaniska Verkstrad AB Work platform
FR3000200A1 (en) * 2012-12-24 2014-06-27 Haulotte Group WEIGHING MECHANISM FOR A NACELLE AND LIFT BOOM COMPRISING SUCH A WEIGHTING MECHANISM
US10519014B2 (en) 2017-06-30 2019-12-31 Mezzanine Safeti-Gates, Inc. Safety barrier for loading dock lift
CN110668366A (en) * 2019-09-25 2020-01-10 江苏师范大学 Street lamp maintenance operation car

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GB2187708A (en) * 1986-03-14 1987-09-16 Pietzsch Ludwig Gmbh & Co An apparatus for monitoring the forces acting during operation on a working cage
JPH10194698A (en) * 1997-01-07 1998-07-28 Nagano Kogyo Kk Load detector for traveling type construction machine
US20020144862A1 (en) * 2001-02-14 2002-10-10 Engvall David P. Apparatus for monitoring loading of a lift
US6585079B1 (en) * 1999-12-14 2003-07-01 1994 Weyer Family Limited Partnership Work platform with rotary actuator
US20030174064A1 (en) * 2001-07-23 2003-09-18 Teruo Igarashi Overload detector of vehicle for high lift work
US20040262078A1 (en) * 2003-06-25 2004-12-30 Bailey Jeffrey H. Load-sensing mechanism for aerial work apparatus

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Publication number Priority date Publication date Assignee Title
GB2187708A (en) * 1986-03-14 1987-09-16 Pietzsch Ludwig Gmbh & Co An apparatus for monitoring the forces acting during operation on a working cage
JPH10194698A (en) * 1997-01-07 1998-07-28 Nagano Kogyo Kk Load detector for traveling type construction machine
US6585079B1 (en) * 1999-12-14 2003-07-01 1994 Weyer Family Limited Partnership Work platform with rotary actuator
US20020144862A1 (en) * 2001-02-14 2002-10-10 Engvall David P. Apparatus for monitoring loading of a lift
US20030174064A1 (en) * 2001-07-23 2003-09-18 Teruo Igarashi Overload detector of vehicle for high lift work
US20040262078A1 (en) * 2003-06-25 2004-12-30 Bailey Jeffrey H. Load-sensing mechanism for aerial work apparatus

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PATENT ABSTRACTS OF JAPAN vol. 1998, no. 12 31 October 1998 (1998-10-31) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2221271A3 (en) * 2009-02-18 2011-03-02 Boliden Mekaniska Verkstrad AB Work platform
WO2010118481A3 (en) * 2009-04-17 2010-12-02 Allenbroer Leo Alix De Lille Multifunctional basket with improved properties
BE1018593A5 (en) * 2009-04-17 2011-04-05 Lille Allenbroer Leo Alix De MULTIFUNCTIONAL WORK CAGE WITH IMPROVED PROPERTIES.
CN101780934A (en) * 2010-02-26 2010-07-21 南京晨光水山电液特装有限公司 High-altitude operation slot load measuring device
FR3000200A1 (en) * 2012-12-24 2014-06-27 Haulotte Group WEIGHING MECHANISM FOR A NACELLE AND LIFT BOOM COMPRISING SUCH A WEIGHTING MECHANISM
WO2014102240A1 (en) * 2012-12-24 2014-07-03 Haulotte Group Weighing mechanism for a lift and aerial lift comprising said weighing mechanism
CN104884914A (en) * 2012-12-24 2015-09-02 哈罗特集团 Weighing mechanism for a lift and aerial lift comprising said weighing mechanism
AU2013369366B2 (en) * 2012-12-24 2017-12-14 Haulotte Group Weighing mechanism for a lift and aerial lift comprising said weighing mechanism
US10519014B2 (en) 2017-06-30 2019-12-31 Mezzanine Safeti-Gates, Inc. Safety barrier for loading dock lift
CN110668366A (en) * 2019-09-25 2020-01-10 江苏师范大学 Street lamp maintenance operation car

Also Published As

Publication number Publication date
GB2441449A (en) 2008-03-05
GB0507972D0 (en) 2005-05-25
GB0720582D0 (en) 2007-11-28
GB2441449B (en) 2009-06-10

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