EP0280796A1 - Weighing device for a forklifttruck - Google Patents

Weighing device for a forklifttruck Download PDF

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Publication number
EP0280796A1
EP0280796A1 EP87202066A EP87202066A EP0280796A1 EP 0280796 A1 EP0280796 A1 EP 0280796A1 EP 87202066 A EP87202066 A EP 87202066A EP 87202066 A EP87202066 A EP 87202066A EP 0280796 A1 EP0280796 A1 EP 0280796A1
Authority
EP
European Patent Office
Prior art keywords
weighing device
fork
lift
load carrying
sleeve
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Withdrawn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
EP87202066A
Other languages
German (de)
French (fr)
Inventor
Raphael Franciscus Maria Van Seumeren
Henrikus Petrus Maria Van Seumeren
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.)
SEUMEREN HENRIKUS PETRUS MARIA
SEUMEREN RAPHAEL FRANCISCUS MA
Original Assignee
SEUMEREN HENRIKUS PETRUS MARIA
SEUMEREN RAPHAEL FRANCISCUS MA
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 SEUMEREN HENRIKUS PETRUS MARIA, SEUMEREN RAPHAEL FRANCISCUS MA filed Critical SEUMEREN HENRIKUS PETRUS MARIA
Publication of EP0280796A1 publication Critical patent/EP0280796A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to a weighing device for a fork lift truck with a fork plate, a lift device and a load carrying device, said weighing device consisting of a lift part to be connected to the fork lift truck and a load part to be connected to the load carrying member, between which lift and load parts a strain gauge has been provided.
  • Such a weighing device is known from the, not pre-published, Netherlands patent application 86-00701 in Applicant's name.
  • said known weighing device appears to function satisfactorily for many applications, the cost of manufacture which are a consequence of the many mechanical elaborations of a large piece of metal, do form a restriction for use in, in particular, fork lift trucks.
  • the known weighing device is based on the force-principle, according to. which the loads are being transferred onto the strain gauge by means of possibly smallest balls. In view of the high dynamic loads that occur with fork lift trucks, this may induce quick wear and the measuring accuracy deteriorates too quickly.
  • the fact that in the known weighing device the heavy pieces of metal have to be welded accurately to the forks is considered to be an additional drawback.
  • a weighing device is obtained in which the measurement is hardly influenced by forces that act perpendicularly to the direction of gravity.
  • the upper face of the other horizontal leg of the substantially T-shaped body and/or a part, in extension of it, of the upper edge of the load carrying member have been lowered.
  • the upper and lower bar can have external screwthread so that the strain gauge can be most accurately adjusted and pretensioned.
  • passage in the other horizontal leg of the substantially T-shaped body can also have internal screw thread.
  • the member that is poor in friction can be a ball, a cylinder, an edgewise strip or a similar connection.
  • the weighing device as illustrated in the drawing consists of a fork plate 1 which, in a known way, forms a part of a (not illustrated) fork lift truck. It is remarked in this respect that it is usual for a fork lift truck to be adapted to co-operate with other members than forks as well, and attention is drawn in particular to the so-called lift clamps and installations with suction pads.
  • the upper edge and the lower edge of the fork plate have standardized protrusions 2 and 3 respectively, which co-operate normally with upper and lower hooks of a set of forks 4.
  • a lower hook has been illustrated at reference numeral 5 in figure 1.
  • the upper hook forms a part of a lift part 6 that consists of a substantially T-shaped body.
  • the lower face of the one horizontal leg 7 of said T-shaped body 6 has a recess 8 so as to co-operate with the protrusion 2 of the fork plate 1.
  • a threaded bore 10 extends through the other horizontal leg 9 of the T-shaped body 6.
  • the vertical leg 11 of the T-shaped body 6 rests against the front of the fork plate 1 and in longitudinal view it is so narrow that in the other horizontal leg 9 there is enough room for the threaded bore 10.
  • the upper face of the T-shaped body 6 is substantially aligned with the upper edge 12 of the forks 4, so that said upper face and said upper edge 12 can be connected by two metal strips 13 and 14.
  • a sleeve 15 has been provided with a bore for a lower bar 18 to be fixed with nuts 16 and 17.
  • the upper end of the lower bar can be locked to a strain gauge 20 by a nut 19.
  • an upper bar 21 can be screwed onto which a nut 22 is applied so as to lock the connection between the strain gauge and the upper bar 21.
  • the upper end of the upper bar 21 can be provided with a nut 23.
  • the juxtaposed surface sections of the T-shaped body 6 and the upper edge 12 of the fork 4 have preferably been lowered, so that the metal strips 13 and 14 can correctly act as hinges in that area so as to pass on the weight on the fork to the strain gauge. Beyond that area with lowered surface sections the metal strips have been arbitrarily tightly connected to the T-shaped body 6 and the upper edge 12 of the fork 4, for instance by screw connections, by welding or adhering.
  • a member which is poor in friction such as a ball or a cylinder 24
  • a member which is poor in friction such as a ball or a cylinder 24
  • the ball 24 In order to make sure that when driving a curve the ball 24 will not be lost, it will have to be kept in its place by a clip 25 in such a way that its function as a member that is poor in friction, is not damaged.
  • Some alternatives for the ball and the cylinder are: a strip with edgewise ends, a needle bearing support and similar members that are poor in friction.

Abstract

A weighing device for a fork lift truck, consisting of a T-shaped upper body (6) that can be connected to the upper edge (27 of a fork plate and having a passage (10) for an upper bar to be connected to a strain gauge (20), said strain gauge being connected via a lower bar (181 to a sleeve (15) at the rear of the fork (14) of the fork lift truck.

Description

  • The present invention relates to a weighing device for a fork lift truck with a fork plate, a lift device and a load carrying device, said weighing device consisting of a lift part to be connected to the fork lift truck and a load part to be connected to the load carrying member, between which lift and load parts a strain gauge has been provided.
  • Such a weighing device is known from the, not pre-published, Netherlands patent application 86-00701 in Applicant's name. Although said known weighing device appears to function satisfactorily for many applications, the cost of manufacture which are a consequence of the many mechanical elaborations of a large piece of metal, do form a restriction for use in, in particular, fork lift trucks. Moreover the known weighing device is based on the force-principle, according to. which the loads are being transferred onto the strain gauge by means of possibly smallest balls. In view of the high dynamic loads that occur with fork lift trucks, this may induce quick wear and the measuring accuracy deteriorates too quickly. Furthermore the fact that in the known weighing device the heavy pieces of metal have to be welded accurately to the forks is considered to be an additional drawback.
  • The invention tends to improve the foregoing. According to the invention this has been achieved with the combination of the features:
    • - that the lift part consists of a substantially T-shaped body having in the lower face of the one horizontal leg a recess adapted to the standardized appearance of the upper edge of the fork plate, and having in the other horizontal leg a passage for an upper bar to be connected to the strain gauge,
    • - that at the rear of the load carrying member near the lower edge as a lower hook a protrusion has been provided having a raised section on the upper face for co-operation with the fork plate,
    • - that at the rear of the load carrying member over the lower hook a sleeve has been provided for a lower bar to be connected to the strain gauge, said sleeve serving as a load part,
    • - that the upper face of the lift part and the load carrying member are interconnected by horizontal strips,
    • - and that the fork plate and the sleeve are kept spaced apart by a member, poor in friction, between the sleeve and the protrusion.
  • Because of this combination of features a weighing device is obtained in which the measurement is hardly influenced by forces that act perpendicularly to the direction of gravity. In order to even increase the accuracy in measurement the upper face of the other horizontal leg of the substantially T-shaped body and/or a part, in extension of it, of the upper edge of the load carrying member have been lowered. The upper and lower bar can have external screwthread so that the strain gauge can be most accurately adjusted and pretensioned.
  • For the same reason the passage in the other horizontal leg of the substantially T-shaped body can also have internal screw thread.
  • The member that is poor in friction can be a ball, a cylinder, an edgewise strip or a similar connection.
  • The invention will be further elucidated hereinafter on the basis of the drawing, in which by way of example an embodiment of a weighing device of the invention has been illustrated. In the drawing:
    • fig. 1 is a schematic longitudinal view of the weighing device with fork plate,
    • fig. 2 is a left side view of the weighing device of figure 1 but without fork plate, and
    • fig. 3 is a right-hand side view of figure 1.
  • The weighing device as illustrated in the drawing consists of a fork plate 1 which, in a known way, forms a part of a (not illustrated) fork lift truck. It is remarked in this respect that it is usual for a fork lift truck to be adapted to co-operate with other members than forks as well, and attention is drawn in particular to the so-called lift clamps and installations with suction pads.
  • The upper edge and the lower edge of the fork plate have standardized protrusions 2 and 3 respectively, which co-operate normally with upper and lower hooks of a set of forks 4. A lower hook has been illustrated at reference numeral 5 in figure 1. However, according to the invention the upper hook forms a part of a lift part 6 that consists of a substantially T-shaped body.The lower face of the one horizontal leg 7 of said T-shaped body 6 has a recess 8 so as to co-operate with the protrusion 2 of the fork plate 1. A threaded bore 10 extends through the other horizontal leg 9 of the T-shaped body 6. The vertical leg 11 of the T-shaped body 6 rests against the front of the fork plate 1 and in longitudinal view it is so narrow that in the other horizontal leg 9 there is enough room for the threaded bore 10.
  • The upper face of the T-shaped body 6 is substantially aligned with the upper edge 12 of the forks 4, so that said upper face and said upper edge 12 can be connected by two metal strips 13 and 14.
  • At the rear of the forks 4, at some distance over the lower hook 5, a sleeve 15 has been provided with a bore for a lower bar 18 to be fixed with nuts 16 and 17. The upper end of the lower bar can be locked to a strain gauge 20 by a nut 19. Through the other horizontal leg 9 of the T-shaped body 6 an upper bar 21 can be screwed onto which a nut 22 is applied so as to lock the connection between the strain gauge and the upper bar 21. Finally the upper end of the upper bar 21 can be provided with a nut 23. There are therefore countless possibilities for adjusting the strain gauge 20 accurately with respect to the fork 4.
  • The juxtaposed surface sections of the T-shaped body 6 and the upper edge 12 of the fork 4 have preferably been lowered, so that the metal strips 13 and 14 can correctly act as hinges in that area so as to pass on the weight on the fork to the strain gauge. Beyond that area with lowered surface sections the metal strips have been arbitrarily tightly connected to the T-shaped body 6 and the upper edge 12 of the fork 4, for instance by screw connections, by welding or adhering.
  • Between the fork 4 and the lower hook 5 a member which is poor in friction, such as a ball or a cylinder 24, has been applied, said member being destined to make sure that the sleeve 15 always remains free from the fork plate 1. In order to make sure that when driving a curve the ball 24 will not be lost, it will have to be kept in its place by a clip 25 in such a way that its function as a member that is poor in friction, is not damaged. Some alternatives for the ball and the cylinder are: a strip with edgewise ends, a needle bearing support and similar members that are poor in friction.
  • Other embodiments than those, illustrated in the drawing, also fall within the scope of the claims.

Claims (6)

1. A weighing device for a fork lift truck with a fork plate, a lift device and a load carrying device, said weighing device consisting of a lift part to be connected to the fork lift truck and a load part to be connected to the load carrying member, between which lift and load parts a strain gauge has been provided, characterized In that -the lift part consists of a substantially T-shaped body having in the lower face of the one horizontal leg (7) a recess (8) adapted to the standardized appearance of the upper edge (2) of the fork plate, and having in the other horizontal leg (9) a passage (10) for an upper bar (21) to be connected to the strain gauge (20),
- that at the rear of the load carrying member (4) near the lower edge as a lower hook a protrusion (5) has been provided having a raised section on the upper face for co-operation with the fork plate, - that at the rear of the load carrying member (4) over the lower hook (5) a sleeve has been provided for a lower bar (18) to be connected to the strain gauge (20), said sleeve serving as a load part, - that the upper face of the lift part (6) and the load carrying member (4) are interconnected by horizontal strips (13, 14),
- and that the fork plate (1) and the sleeve (15) are kept spaced apart by a member (14), poor in friction, between the sleeve (15) and the protrusion (5).
2. Weighing device as claimed in claim 1, characterized In that the upper face of the other horizontal leg (9) of the substantially T-shaped body (6) and/or a part,in extension of it,of the upper edge (12) of the load carrying member (4) have been lowered.
3. Weighing device as claimed in claim 1 or 2, characterized in that the upper and lower bar (21 and 18) has been provided with external screwthread.
4. Weighing device as claimed in claim 3, characterized In that the passage (10) in the other horizontal leg (9) of the substantially T-shaped body (6) has been provided with internal screwthread.
5. Weighing devcie as claimed in any one of claims 1-4, characterized In that the member that is poor in friction is a ball or a cylinder.
6. Weighing device as illustrated in the drawing and/or reviewed with reference to said drawing.
EP87202066A 1987-02-03 1987-10-27 Weighing device for a forklifttruck Withdrawn EP0280796A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8700262A NL8700262A (en) 1987-02-03 1987-02-03 WEIGHING MACHINE FOR A FORKLIFT TRUCK.
NL8700262 1987-02-03

Publications (1)

Publication Number Publication Date
EP0280796A1 true EP0280796A1 (en) 1988-09-07

Family

ID=19849514

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87202066A Withdrawn EP0280796A1 (en) 1987-02-03 1987-10-27 Weighing device for a forklifttruck

Country Status (2)

Country Link
EP (1) EP0280796A1 (en)
NL (1) NL8700262A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5087167A (en) * 1989-05-25 1992-02-11 Allegheny Ludlum Corporation Lifting shoe assembly for use on sheet lifters
US5368435A (en) * 1993-01-28 1994-11-29 Brudi, Inc. Side shifter attachment and retainer for lift truck attachments
BE1009275A4 (en) * 1995-04-06 1997-01-07 Vliet Ronny Van De Mobile weighing unit to be attached to a transhipment vehicle
FR2790463A1 (en) * 1999-03-02 2000-09-08 Balea Weighing fork for shifting truck has weight sensor working in compression on horizontal arm, and two weight sensors working in traction on vertical arm
EP1306345A1 (en) * 2001-10-24 2003-05-02 STILL WAGNER GmbH & Co KG Measuring device on forks

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850181A (en) * 1953-11-27 1958-09-02 Union Metal Mfg Co Scale for lift truck or the like
US2877906A (en) * 1954-02-08 1959-03-17 Clark Equipment Co Load weighing device
DE1100557B (en) * 1955-09-19 1961-02-23 Baldwin Lima Hamilton Corp Lifting equipment, in particular forklift trucks, with a weighing device
US3066807A (en) * 1961-04-19 1962-12-04 Elwell Parker Electric Co Industrial truck
US3196966A (en) * 1964-01-13 1965-07-27 Goodman Mfg Co Weighing apparatus
DE2164945A1 (en) * 1971-12-28 1973-07-19 Hans H Meyer Ohg WEIGHING DEVICE ON MOBILE LIFT TRUCKS
US3910363A (en) * 1974-12-27 1975-10-07 Allegany Technology Inc Weighing device for fork lift truck
US4323132A (en) * 1980-08-25 1982-04-06 Weigh-Tronix, Inc. Mounting adapter for a fork lift truck

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2850181A (en) * 1953-11-27 1958-09-02 Union Metal Mfg Co Scale for lift truck or the like
US2877906A (en) * 1954-02-08 1959-03-17 Clark Equipment Co Load weighing device
DE1100557B (en) * 1955-09-19 1961-02-23 Baldwin Lima Hamilton Corp Lifting equipment, in particular forklift trucks, with a weighing device
US3066807A (en) * 1961-04-19 1962-12-04 Elwell Parker Electric Co Industrial truck
US3196966A (en) * 1964-01-13 1965-07-27 Goodman Mfg Co Weighing apparatus
DE2164945A1 (en) * 1971-12-28 1973-07-19 Hans H Meyer Ohg WEIGHING DEVICE ON MOBILE LIFT TRUCKS
US3910363A (en) * 1974-12-27 1975-10-07 Allegany Technology Inc Weighing device for fork lift truck
US4323132A (en) * 1980-08-25 1982-04-06 Weigh-Tronix, Inc. Mounting adapter for a fork lift truck

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5087167A (en) * 1989-05-25 1992-02-11 Allegheny Ludlum Corporation Lifting shoe assembly for use on sheet lifters
US5368435A (en) * 1993-01-28 1994-11-29 Brudi, Inc. Side shifter attachment and retainer for lift truck attachments
BE1009275A4 (en) * 1995-04-06 1997-01-07 Vliet Ronny Van De Mobile weighing unit to be attached to a transhipment vehicle
FR2790463A1 (en) * 1999-03-02 2000-09-08 Balea Weighing fork for shifting truck has weight sensor working in compression on horizontal arm, and two weight sensors working in traction on vertical arm
EP1306345A1 (en) * 2001-10-24 2003-05-02 STILL WAGNER GmbH & Co KG Measuring device on forks

Also Published As

Publication number Publication date
NL8700262A (en) 1988-09-01

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