US2659592A - Load weight indicator for forklift trucks - Google Patents

Load weight indicator for forklift trucks Download PDF

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Publication number
US2659592A
US2659592A US280921A US28092152A US2659592A US 2659592 A US2659592 A US 2659592A US 280921 A US280921 A US 280921A US 28092152 A US28092152 A US 28092152A US 2659592 A US2659592 A US 2659592A
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cylinder
load weight
weight
weight indicator
load
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US280921A
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Cecil L Wetsel
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    • 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

Definitions

  • Another important object of the present invention is to provide a load weight indicator as above which is hydraulically operated; the device including a hydraulic gauge within view of the operator and calibrated in terms of weight, and a hydraulic pressure unit communicating with the gauge adapted to be subjected to the weight of the load in a novel manner.
  • An additional object of this invention is to provide a load weight indicator as in the preceding paragraphs wherein the device is selectively operable, i. e. at the will of the operator of the fork lift truck. This is accomplished by mounting the hydraulic pressure unit for movement, by power means, between a working position in the path of a member on the elevator frame of the fork lift truck, and a non-working position clear of said elevator frame.
  • a still further object of this invention is to provide a load weight indicator which is capable of being readily and conveniently applied, as an attachment, to a conventional fork lift truck; the device, when so attached, not in any way obstructing the operation of the truck.
  • Still another object of the invention is to provide a practical, reliable and accurate load weight indicator for fork lift trucks, and one which will be exceedingly effective for the purpose for which it is designed.
  • Fig. 1 is a side elevation of a fork lift truck embodying the present invention.
  • Fig. 2 is an enlarged rear elevation of the upper portion of the frame assembly of the truck showing particularly the mounting of the hydraulic pressure unit; the latter being shown in its nonworking position.
  • Fig. 3 is a similar view but shows the hydraulic pressure unit as shifted to its working position.
  • Fig. 4 is a top plan view of the structural arrangement as in Fig. 3.
  • Fig. 5 is an enlarged sectional elevation of the hydraulic pressure unit detached.
  • the invention is here shown as mounted in connection with a conventional fork lift truck indicated generally at I, which truck includes, at the front, an up standing main frame 2 having a movable or elevator frame 3 thereon.
  • the elevator frame 3 is run up or down by conventional power means, and said elevator frame carries the forwardly projecting load supporting forks 4.
  • the present invention comprises a hydraulic gauge 5 calibrated in terms of weight and mounted on the fork lift truck I directly ahead of the operators seat 6, whereby such gauge is disposed for easy reading.
  • the hydraulic gauge 5 is connected by a hydraulic pressure conduit 1, flexible at least in part, with a hydraulic pressure unit indicated generally at 8.
  • the hydraulic pressure unit 3 comprises a relatively short upstanding cylinder 9 closed top and bottom.
  • a piston l 0 works in the cylinder 9 on a quantity of hydraulic fluid I I in said cylinder.
  • a piston rod l2 upstands from the piston l0 and-is slidable through a guide sleeve 13 which projects upward from the top of the cylinder; such guide sleeve l3 being enclosed within a protective housing M.
  • the piston rod [2 projects some distance above the guide sleeve l3 and protective housing 14 as shown.
  • the above described hydraulic pressure unit 8 is set on a horizontal platform [5 which is fixed to and projects rearwardly from the center portion of the top cross beam it of the main frame 2.
  • the hydraulic pressure unit 8 is formed at the bottom with a radial arm [1 which extends inwardly to a pivot l8 on the platform 15 substantially centrally of the latter. As so mounted, the hydraulic pressure unit 8 is swingable between a non-working position clear of the vertical path of 9. lug I9 which projects rearwardly from the center of the top cross beam 20 of the elevator frame 3, as shown in Fig. 2, and a working position directly below said lug l9 as shown in Fig. 3.
  • on the forks 4 are in their entirety imposed directly on the hydraulic pressure unit 8, i. e. on the piston I0 working against the fluid ll; it being understood that the power means which works the elevator frame is totally relieved during the period of the weight recording.
  • the cylinder 9 is in communication with the conduit I so that pressure from the cylinder 9, produced by the load weight as above, is transmitted to and reflects itself in the gauge 5, which gauge has a tare corresponding to the weight of the elevator frame 3 and forks 4 whence the gauge 5 reads directly and accurately in terms of the weight of lpad z l.
  • the hydraulic pressure unit 8 is swung out of the path of the lug l9 so that the elevator frame 3 may continue its downward movement until theforks 4 are at ground level; such movement of the unit I being accomplished by power means as'follows:
  • a small double acting power cylinder 22 extends laterally from the unit 8, being connected between the latter and an outrigger arm 23 on the-n'iain frame 2, the points of pivotal connection being imiioated at 24 and 25. It-will be recognized that upon-actuation of the power cylinder 22 to extend it, the unit 8 is moved to working positionwhile contraction of said power cylinder moves the unit l to non-working position.
  • the double acting power cylinder 22 is controlled by the operator through the medium of a valve regulated fluid pressure supply conduit systern-26 which includes a control valve 21 therein;
  • picked up by the fork lifttr-uck I is accurately-indicated to the truck operator who notes the weight upon a suitable record.
  • the totalweight of a load placed part by part on a hauling truck by the fork lift-truck canine-accurately ascertained in order to prevent overloading.
  • the foland including an upwardly projecting-vertically movable element whose downward movement exerts pressure on the fluid in the unit, a pressure gauge calibratedin terms of weight mounted on the truck, and a conduit between the gauge and unit; and a lug fixed on the elevator frame and *projectingtherefrom in overhanging relation to the working position of said movable element and at a level to engage the same upon lowering of the'elevator frame to adjacent its lowest position on the main frame.
  • A'device asinclaim l with means mounting the unit on the main frame for movement between a working position in vertical alinement with the lug to a position clear of the same.
  • a device as in claim l in which the unit includes a vertical axis cylinder; a platform fixed on themain frame on which the cylinder rests, a radial arm projecting from the cylinder, and means pivoting the arm on the platform in position to enable the cylinder tobe shiftedhorizontally between a working; position in vertical alinement with the lug to a' non-working position clear of said lug.
  • a device as in claimB, with means to shift the cylinder comprising a bracket on-the main frame laterally offset from the cylinden and a hydraulic cylinder unit pivoted at one end on the bracket and at the other end on the cylinder in circumferentially offset relation to the arm.

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

Description

Nov. 17, 1953 c. L. WETSEL LOAD WEIGHT INDICATOR FOR FORK-LIFT TRUCKS Filed April 7, 1952 CECIL .L. WETSEL M-M/ M ATTORNEYS Patented Nov. 17, 1953 LOAD WEIGHT INDICATOR FOR FORK- LIFT TRUCKS Cecil L. Wetsel, Sacramento, Calif.
Application April 7, 1952, Serial No. 280,921
4 Claims.
In the use of a fork lift truck it is often desirable that the operator know the weight of each load picked up on the forks, and the present invention provides, as a major object, a novel indicator for such purposes.
Another important object of the present invention is to provide a load weight indicator as above which is hydraulically operated; the device including a hydraulic gauge within view of the operator and calibrated in terms of weight, and a hydraulic pressure unit communicating with the gauge adapted to be subjected to the weight of the load in a novel manner.
An additional object of this invention is to provide a load weight indicator as in the preceding paragraphs wherein the device is selectively operable, i. e. at the will of the operator of the fork lift truck. This is accomplished by mounting the hydraulic pressure unit for movement, by power means, between a working position in the path of a member on the elevator frame of the fork lift truck, and a non-working position clear of said elevator frame.
A still further object of this invention is to provide a load weight indicator which is capable of being readily and conveniently applied, as an attachment, to a conventional fork lift truck; the device, when so attached, not in any way obstructing the operation of the truck.
It is also an object of the invention to provide a load weight indicator which is designed for ease and economy of manufacture.
Still another object of the invention is to provide a practical, reliable and accurate load weight indicator for fork lift trucks, and one which will be exceedingly effective for the purpose for which it is designed.
These objects are accomplished by means of such structure and relative arrangement of parts as will fully appear by a persual of the following specification and claims.
In the drawings:
Fig. 1 is a side elevation of a fork lift truck embodying the present invention.
Fig. 2 is an enlarged rear elevation of the upper portion of the frame assembly of the truck showing particularly the mounting of the hydraulic pressure unit; the latter being shown in its nonworking position.
Fig. 3 is a similar view but shows the hydraulic pressure unit as shifted to its working position.
Fig. 4 is a top plan view of the structural arrangement as in Fig. 3.
Fig. 5 is an enlarged sectional elevation of the hydraulic pressure unit detached.
Referring now more particularly to the characters of reference on the drawings, the invention is here shown as mounted in connection with a conventional fork lift truck indicated generally at I, which truck includes, at the front, an up standing main frame 2 having a movable or elevator frame 3 thereon. The elevator frame 3 is run up or down by conventional power means, and said elevator frame carries the forwardly projecting load supporting forks 4.
The present invention comprises a hydraulic gauge 5 calibrated in terms of weight and mounted on the fork lift truck I directly ahead of the operators seat 6, whereby such gauge is disposed for easy reading.
The hydraulic gauge 5 is connected by a hydraulic pressure conduit 1, flexible at least in part, with a hydraulic pressure unit indicated generally at 8.
The hydraulic pressure unit 3 comprises a relatively short upstanding cylinder 9 closed top and bottom. A piston l 0 works in the cylinder 9 on a quantity of hydraulic fluid I I in said cylinder. A piston rod l2 upstands from the piston l0 and-is slidable through a guide sleeve 13 which projects upward from the top of the cylinder; such guide sleeve l3 being enclosed within a protective housing M. The piston rod [2 projects some distance above the guide sleeve l3 and protective housing 14 as shown.
The above described hydraulic pressure unit 8 is set on a horizontal platform [5 which is fixed to and projects rearwardly from the center portion of the top cross beam it of the main frame 2.
The hydraulic pressure unit 8 is formed at the bottom with a radial arm [1 which extends inwardly to a pivot l8 on the platform 15 substantially centrally of the latter. As so mounted, the hydraulic pressure unit 8 is swingable between a non-working position clear of the vertical path of 9. lug I9 which projects rearwardly from the center of the top cross beam 20 of the elevator frame 3, as shown in Fig. 2, and a working position directly below said lug l9 as shown in Fig. 3.
When the hydraulicpressure unit 8 is disposed in its working position directly below the lug 19, the latter comes to rest on the piston rod [2 shortly before the elevator frame 3 reaches its lowermost point of movement.
As a consequence, weight of the elevator frame 3 and the load 2| on the forks 4 are in their entirety imposed directly on the hydraulic pressure unit 8, i. e. on the piston I0 working against the fluid ll; it being understood that the power means which works the elevator frame is totally relieved during the period of the weight recording. The cylinder 9 is in communication with the conduit I so that pressure from the cylinder 9, produced by the load weight as above, is transmitted to and reflects itself in the gauge 5, which gauge has a tare corresponding to the weight of the elevator frame 3 and forks 4 whence the gauge 5 reads directly and accurately in terms of the weight of lpad z l.
Afterthe'weight 'ofthe load 2| has been determined and recorded by the operator, the hydraulic pressure unit 8 is swung out of the path of the lug l9 so that the elevator frame 3 may continue its downward movement until theforks 4 are at ground level; such movement of the unit I being accomplished by power means as'follows:
A small double acting power cylinder 22 extends laterally from the unit 8, being connected between the latter and an outrigger arm 23 on the-n'iain frame 2, the points of pivotal connection being imiioated at 24 and 25. It-will be recognized that upon-actuation of the power cylinder 22 to extend it, the unit 8 is moved to working positionwhile contraction of said power cylinder moves the unit l to non-working position.
The double acting power cylinder 22 is controlled by the operator through the medium of a valve regulated fluid pressure supply conduit systern-26 which includes a control valve 21 therein;
such valve being worked'by an -upstanding hand leverlfl.
With the described weight indicator, the weight of each'load' 2| picked up by the fork lifttr-uck I is accurately-indicated to the truck operator who notes the weight upon a suitable record. In this way the totalweight of a load placed part by part on a hauling truck by the fork lift-truck canine-accurately ascertained in order to prevent overloading. This is only one example'of many advantages which accrue-from use of the described load weight indicator.
present andpreferred construction of the device,
still in practice such deviations from such detail may beresorted to as do-not form a departure from the spirit of the invention, as defined by the appended claims.
Havingthus described the invention, the foland including an upwardly projecting-vertically movable element whose downward movement exerts pressure on the fluid in the unit, a pressure gauge calibratedin terms of weight mounted on the truck, and a conduit between the gauge and unit; and a lug fixed on the elevator frame and *projectingtherefrom in overhanging relation to the working position of said movable element and at a level to engage the same upon lowering of the'elevator frame to adjacent its lowest position on the main frame.
2. A'device asinclaim l, with means mounting the unit on the main frame for movement between a working position in vertical alinement with the lug to a position clear of the same.
3. A device as in claim l, in which the unit includes a vertical axis cylinder; a platform fixed on themain frame on which the cylinder rests, a radial arm projecting from the cylinder, and means pivoting the arm on the platform in position to enable the cylinder tobe shiftedhorizontally between a working; position in vertical alinement with the lug to a' non-working position clear of said lug.
4. A device as in claimB, with means to shift the cylinder comprising a bracket on-the main frame laterally offset from the cylinden and a hydraulic cylinder unit pivoted at one end on the bracket and at the other end on the cylinder in circumferentially offset relation to the arm.
CECIL L. WET'SEL.
References Cited in the file of this patent UNITED STATES PATENTS Number 'Name Date -32,326 Winter .I\Iay 14, 1861 231,838 Moro Aug. 31, 1880 2,373,469 Grime Apr. 10, 1945 FOREIGN PATENTS Number Country 'Date 6,222 Great Britain July '25, '1912 650,375 Great Britain Feb. 21, 1951
US280921A 1952-04-07 1952-04-07 Load weight indicator for forklift trucks Expired - Lifetime US2659592A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722411A (en) * 1953-12-10 1955-11-01 Donald W Philbrook Hydraulic lift truck scales
US2848212A (en) * 1953-05-22 1958-08-19 Stothert & Pitt Ltd Pressure relief device for hydraulic weighing
US2850181A (en) * 1953-11-27 1958-09-02 Union Metal Mfg Co Scale for lift truck or the like
US2980414A (en) * 1956-03-16 1961-04-18 Cherry Burrell Corp Compression bracket
US3032131A (en) * 1954-12-07 1962-05-01 Egon F Schmerl Elevation adjustable weighing scale
US3431992A (en) * 1966-12-16 1969-03-11 Smithkline Corp Lift truck scale

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US32326A (en) * 1861-05-14 winter
US231838A (en) * 1880-08-31 Pethhs
GB191206222A (en) * 1912-03-13 1912-07-25 George Murdoch An Improved Portable Carrying, Weighing and Lifting Machine.
US2373469A (en) * 1943-09-11 1945-04-10 Edward P Grime Weight indicating lifting jack
GB650375A (en) * 1948-11-24 1951-02-21 Archer Barnes Improvements in or relating to mobile material lifting and transporting vehicles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US32326A (en) * 1861-05-14 winter
US231838A (en) * 1880-08-31 Pethhs
GB191206222A (en) * 1912-03-13 1912-07-25 George Murdoch An Improved Portable Carrying, Weighing and Lifting Machine.
US2373469A (en) * 1943-09-11 1945-04-10 Edward P Grime Weight indicating lifting jack
GB650375A (en) * 1948-11-24 1951-02-21 Archer Barnes Improvements in or relating to mobile material lifting and transporting vehicles

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2848212A (en) * 1953-05-22 1958-08-19 Stothert & Pitt Ltd Pressure relief device for hydraulic weighing
US2850181A (en) * 1953-11-27 1958-09-02 Union Metal Mfg Co Scale for lift truck or the like
US2722411A (en) * 1953-12-10 1955-11-01 Donald W Philbrook Hydraulic lift truck scales
US3032131A (en) * 1954-12-07 1962-05-01 Egon F Schmerl Elevation adjustable weighing scale
US2980414A (en) * 1956-03-16 1961-04-18 Cherry Burrell Corp Compression bracket
US3431992A (en) * 1966-12-16 1969-03-11 Smithkline Corp Lift truck scale

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