GB2053495A - Weighing indicator - Google Patents

Weighing indicator Download PDF

Info

Publication number
GB2053495A
GB2053495A GB8019171A GB8019171A GB2053495A GB 2053495 A GB2053495 A GB 2053495A GB 8019171 A GB8019171 A GB 8019171A GB 8019171 A GB8019171 A GB 8019171A GB 2053495 A GB2053495 A GB 2053495A
Authority
GB
United Kingdom
Prior art keywords
gauge
mast
cable
truck
indicator
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB8019171A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AXHOLME ENTERPRISES Ltd
Original Assignee
AXHOLME ENTERPRISES Ltd
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 AXHOLME ENTERPRISES Ltd filed Critical AXHOLME ENTERPRISES Ltd
Priority to GB8019171A priority Critical patent/GB2053495A/en
Publication of GB2053495A publication Critical patent/GB2053495A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
    • G01G19/083—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles lift truck scale
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
    • G01L7/04—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges
    • G01L7/043—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges with mechanical transmitting or indicating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
    • G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
    • G01L7/04—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges
    • G01L7/048—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges correcting or regulating means for flexible, deformable tubes

Abstract

A safe load indicator for a fork lift truck indicates not only the weight of the load being lifted when the mast 37 of the truck is in a vertical position but also increases said load indication when the mast is tilted forwardly from the vertical position. The indicator preferably is in the form of a modified Bourdon gauge, the tilting of the mast being transmitted to the gauge and effecting relative rotation between the face 17 of the gauge and the gauge needle. <IMAGE>

Description

SPECIFICATION Weight indicator This invention relates to a weight indicator particularly for use with a fork lift truck.
A particular fork lift truck is capable of lifting loads within a certain safe weight range. The recommended maximum safe load is usually stamped on the mast of a particular truck. Unless the operator is aware of the weight of the object he is lifting, it is possible to overload the truck. A load gauge can be fitted to the fork lift truck, such a load gauge being for instance a pressure gauge utilising a Bourdon tube. Such a gauge gives the operator an indication of the weight of the loád he is lifting. However the mast of a fork lift truck can be tilted forwardly thereby increasing the tendency of a particular load to tip or partially tip the truck over.
According to the present invention there is provided a safe load indicator for a fork lift truck, the indicator including means for giving a load indication for a particular load applied to the truck when the mast of the truck is in a vertical position and means for increasing said load indication when the mast is tilted forwardly.
Accordingly a safe load indicator in accordance with the present invention makes allowance for the increased tendency of the truck to tip over when the mast is tilted forwardly from the vertical position.
Preferably the indicator is a pressure gauge, more preferably a Bourdon gauge utilising a Bourdon tube. Such a gauge may be connected to the main hydraulic oil supply of the ram.
Preferably the extent of forward tilting of the mast is communicated to the pressure gauge by means of a cable and sheath arrangement similar to that of a bicycle brake cable and sometimes known as a Bowden cable. Such a cable is connected at one end to the mast and at the other end to the pressure gauge, the connection being such that tilting of the mast causes relative swiveiling of the face of the gauge and the gauge needle. For instance the cable could be connected directly to the face of the gauge or to the back plate of the gauge which carries the gauge mechanism.
An embodiment of the present invention will now be described, by way of example only, and with reference to the accompanying drawings, in which: Figure 1 shows a safe load indicator in accordance with the present invention; and Figure 2 shows the safe load indicator of Figure 1, connected to a fork lift truck.
Referring to the drawings, a safe load indicator in accordance with the present invention is a modified Bourdon gauge having a connector 1 for attachment to hydraulic hose 3 which is connected to the bottom of the main hydraulic ram of fork lift truck 5.
A flexible tube 7 extends between connector 1 and the flexible Bourdon tube 9. Bourdon tube 9 is in turn connected to the usual mechanism indicated generally at 11 for transferring the pressure applied to tube 9 to the turning of needle 13 and the return of needle 13 to its initial position when the pressure is relieved.
The mechanism is mounted on back plate 15 and pressure applied to the Bourdon tube 9 causes the needle to swivel round the fixed face 17 of the gauge. The back plate 15 is itself mounted for movement about its centre, thereby moving the entire mechanism 11, including needle 13, relative to face 17.
The arrangement for moving back plate 15 comprises a block 17 which is fixed to back plate 15. Attached to block 17 is a link 19 which is in turn connected to one end of arrn 21. Arm 21 is mounted for pivotal movement about swivel 23 and has connected to its other end cable 25 of cable and sheath arrangement 27. This cable and sheath arrangement 27 is similar to the ordinary brake cable of a bicycle (Bowden cable). The sheath 29 is connected at one end 31 to the casing of the gauge and at the other end 33 to the frame of the fork lift truck. The cable 25 is connected at its other end 35 to the mast 37 of the truck.It will be seen that tilting of the mast of the truck causes movement of the cable relative to the sheath and consequent swivelling of the back piate and its attached mechanism.
The face 17 of the gauge is calibrated by using the internal diameter of the main hydraulic ram and using the relationship weight equals pressure times area so that the gauge will give an indication of the weight of any object being lifted by the fork lift truck. This calibration may be appropriate for the lifting of objects when the mast 37 is in the vertical position and, as can be seen in Figure 2, the face is divided into three zones. The green zone 39 indicates the area of safe operation, the amber zone 41 indicates a "caution area" and the red zone indicates a danger or unstable íoad area.When the mast 37 of fork lift truck is tilted forwardly from the vertical position the effect on the gauge is that the needle gives a reading which is higher than it would give if the mast were in the vertical position, The arrangement is such that the increased reading takes account of the greater tendency of the fork íift truck to tip when the mast is tilted forwardly. If desired, the arrangement can be such that when the mast is tilted backwardly from the vertical position the needle reading is lower than it would be if the mast were in a vertical position.
In an alternative embodiment, the cable and sheath is connected to the face of the gauge which is mounted for rotation about its centre relative to the gauge mechanism to achieve the same effect as the above-described embodiment.
In a further alternative embodiment, cable and sheath arrangement 27 may be replaced by a hydraulic or other type of connection between the mast and the safe load indicating device.
1. A safe load indicator for a fork lift truck, the indicator including means for giving a load
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (9)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Weight indicator This invention relates to a weight indicator particularly for use with a fork lift truck. A particular fork lift truck is capable of lifting loads within a certain safe weight range. The recommended maximum safe load is usually stamped on the mast of a particular truck. Unless the operator is aware of the weight of the object he is lifting, it is possible to overload the truck. A load gauge can be fitted to the fork lift truck, such a load gauge being for instance a pressure gauge utilising a Bourdon tube. Such a gauge gives the operator an indication of the weight of the loád he is lifting. However the mast of a fork lift truck can be tilted forwardly thereby increasing the tendency of a particular load to tip or partially tip the truck over. According to the present invention there is provided a safe load indicator for a fork lift truck, the indicator including means for giving a load indication for a particular load applied to the truck when the mast of the truck is in a vertical position and means for increasing said load indication when the mast is tilted forwardly. Accordingly a safe load indicator in accordance with the present invention makes allowance for the increased tendency of the truck to tip over when the mast is tilted forwardly from the vertical position. Preferably the indicator is a pressure gauge, more preferably a Bourdon gauge utilising a Bourdon tube. Such a gauge may be connected to the main hydraulic oil supply of the ram. Preferably the extent of forward tilting of the mast is communicated to the pressure gauge by means of a cable and sheath arrangement similar to that of a bicycle brake cable and sometimes known as a Bowden cable. Such a cable is connected at one end to the mast and at the other end to the pressure gauge, the connection being such that tilting of the mast causes relative swiveiling of the face of the gauge and the gauge needle. For instance the cable could be connected directly to the face of the gauge or to the back plate of the gauge which carries the gauge mechanism. An embodiment of the present invention will now be described, by way of example only, and with reference to the accompanying drawings, in which: Figure 1 shows a safe load indicator in accordance with the present invention; and Figure 2 shows the safe load indicator of Figure 1, connected to a fork lift truck. Referring to the drawings, a safe load indicator in accordance with the present invention is a modified Bourdon gauge having a connector 1 for attachment to hydraulic hose 3 which is connected to the bottom of the main hydraulic ram of fork lift truck 5. A flexible tube 7 extends between connector 1 and the flexible Bourdon tube 9. Bourdon tube 9 is in turn connected to the usual mechanism indicated generally at 11 for transferring the pressure applied to tube 9 to the turning of needle 13 and the return of needle 13 to its initial position when the pressure is relieved. The mechanism is mounted on back plate 15 and pressure applied to the Bourdon tube 9 causes the needle to swivel round the fixed face 17 of the gauge. The back plate 15 is itself mounted for movement about its centre, thereby moving the entire mechanism 11, including needle 13, relative to face 17. The arrangement for moving back plate 15 comprises a block 17 which is fixed to back plate 15. Attached to block 17 is a link 19 which is in turn connected to one end of arrn 21. Arm 21 is mounted for pivotal movement about swivel 23 and has connected to its other end cable 25 of cable and sheath arrangement 27. This cable and sheath arrangement 27 is similar to the ordinary brake cable of a bicycle (Bowden cable). The sheath 29 is connected at one end 31 to the casing of the gauge and at the other end 33 to the frame of the fork lift truck. The cable 25 is connected at its other end 35 to the mast 37 of the truck.It will be seen that tilting of the mast of the truck causes movement of the cable relative to the sheath and consequent swivelling of the back piate and its attached mechanism. The face 17 of the gauge is calibrated by using the internal diameter of the main hydraulic ram and using the relationship weight equals pressure times area so that the gauge will give an indication of the weight of any object being lifted by the fork lift truck. This calibration may be appropriate for the lifting of objects when the mast 37 is in the vertical position and, as can be seen in Figure 2, the face is divided into three zones. The green zone 39 indicates the area of safe operation, the amber zone 41 indicates a "caution area" and the red zone indicates a danger or unstable íoad area.When the mast 37 of fork lift truck is tilted forwardly from the vertical position the effect on the gauge is that the needle gives a reading which is higher than it would give if the mast were in the vertical position, The arrangement is such that the increased reading takes account of the greater tendency of the fork íift truck to tip when the mast is tilted forwardly. If desired, the arrangement can be such that when the mast is tilted backwardly from the vertical position the needle reading is lower than it would be if the mast were in a vertical position. In an alternative embodiment, the cable and sheath is connected to the face of the gauge which is mounted for rotation about its centre relative to the gauge mechanism to achieve the same effect as the above-described embodiment. In a further alternative embodiment, cable and sheath arrangement 27 may be replaced by a hydraulic or other type of connection between the mast and the safe load indicating device. CLAIMS
1. A safe load indicator for a fork lift truck, the indicator including means for giving a load indication for a particular load applied to the truck when the mast of the truck is in a vertical position and means for increasing said load indication when the mast is tilted forwardly.
2. An indicator according to claim 1 in the form of a pressure gauge.
3. An indicator according to claim 2 wherein the pressure gauge is a Bourdon gauge.
4. An indicator according to claim 2 or claim 3 wherein the gauge is connectable to the main hydraulic oil supply of the fork lift truck.
5. An indicator according to any of claims 2 to 4 wherein the extent of forward tilting of the mast is communicated to the pressure gauge by means of a cable and sheath arrangement.
6. An indicator according to claim 5 wherein the cable is connected directly to the face of the pressure gauge.
7. An indicator according to claim 5 wherein the cable is connected to the back plate of the pressure gauge.
8. An indicator according to claim 1 and substantially as described herein with reference to the accompanying drawings.
9. A safe load indicator for a fork lift truck substantially as herein described.
GB8019171A 1979-07-09 1980-06-12 Weighing indicator Withdrawn GB2053495A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8019171A GB2053495A (en) 1979-07-09 1980-06-12 Weighing indicator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7923858 1979-07-09
GB8019171A GB2053495A (en) 1979-07-09 1980-06-12 Weighing indicator

Publications (1)

Publication Number Publication Date
GB2053495A true GB2053495A (en) 1981-02-04

Family

ID=26272131

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8019171A Withdrawn GB2053495A (en) 1979-07-09 1980-06-12 Weighing indicator

Country Status (1)

Country Link
GB (1) GB2053495A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499053A1 (en) * 1981-02-04 1982-08-06 Toyoda Automatic Loom Works METHOD AND APPARATUS FOR INDICATING THE CHARGING STATE OF A FORKLIFT FORKLIFT
WO1987002128A1 (en) * 1985-10-05 1987-04-09 Weightwise Limited A vehicle load monitoring system
EP0218466A1 (en) * 1985-10-01 1987-04-15 Manterfield, Kenneth Charles Vehicle load monitoring system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2499053A1 (en) * 1981-02-04 1982-08-06 Toyoda Automatic Loom Works METHOD AND APPARATUS FOR INDICATING THE CHARGING STATE OF A FORKLIFT FORKLIFT
DE3203553A1 (en) * 1981-02-04 1982-10-28 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, Aichi METHOD AND DEVICE FOR DISPLAYING THE CHARGING STATE FOR A FORKLIFT
US4511974A (en) * 1981-02-04 1985-04-16 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Load condition indicating method and apparatus for forklift truck
EP0218466A1 (en) * 1985-10-01 1987-04-15 Manterfield, Kenneth Charles Vehicle load monitoring system
WO1987002128A1 (en) * 1985-10-05 1987-04-09 Weightwise Limited A vehicle load monitoring system
EP0223384A1 (en) * 1985-10-05 1987-05-27 Manterfield, Kenneth Charles A vehicle load monitoring system

Similar Documents

Publication Publication Date Title
CA1110740A (en) Rear drive assembly with load sensing
EP1019315B2 (en) Productivity package
US3035712A (en) Overload safety control apparatus for cranes
GB2053495A (en) Weighing indicator
JPH05178596A (en) Load detecting device for boom installed on vehicle
US4153123A (en) Hoisting and handling device having weighing means
US3963051A (en) System for the remote control of the jack cylinders of a hydraulically operated crane
US3812916A (en) Draft sensing unit for tractor
US3796335A (en) Bucket position indicator
GB993762A (en) A device for giving an indication when a predetermined load is exceeded
US2767394A (en) Tipping moment indicator for lifting trucks
US4271910A (en) Draft sensing device including load pin with free end
US3841493A (en) Moment monitoring system for hydraulic-piston type cranes
US3771667A (en) Moment monitoring system for boom-cable type cranes
GB2099787A (en) Forklift shift attachment
US3098528A (en) Tractor hitches
US2377315A (en) Hitch for trailers
US4093092A (en) Load limiting device
SE8604476D0 (en) DEVICE BY DOLLY
GB2487608A (en) Clevis pin strain sensor for vehicle payload weighing
GB2060554A (en) Apparatus for lifting or lowering a load
US3217895A (en) Safe load indicator for cranes and the like
GB980132A (en) Improvements in safe load indicating devices for cranes
GB1599023A (en) Hoisting and handling device having weighing means
GB1453550A (en) Lockable telescopic control system for the gearbox of a tilting cab type vehicle

Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)