US3833932A - Boom length operating radius indicator and warning device - Google Patents

Boom length operating radius indicator and warning device Download PDF

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Publication number
US3833932A
US3833932A US00297062A US29706272A US3833932A US 3833932 A US3833932 A US 3833932A US 00297062 A US00297062 A US 00297062A US 29706272 A US29706272 A US 29706272A US 3833932 A US3833932 A US 3833932A
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United States
Prior art keywords
boom
signal
length
producing
indicator
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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.)
Expired - Lifetime
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US00297062A
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English (en)
Inventor
M Hamilton
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Eaton Corp
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Eaton Corp
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Filing date
Publication date
Application filed by Eaton Corp filed Critical Eaton Corp
Priority to US00297062A priority Critical patent/US3833932A/en
Priority to CA182,506A priority patent/CA1000856A/en
Priority to DE19732350904 priority patent/DE2350904A1/de
Priority to IT29986/73A priority patent/IT995774B/it
Priority to FR7336467A priority patent/FR2202842B1/fr
Application granted granted Critical
Publication of US3833932A publication Critical patent/US3833932A/en
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/88—Safety gear
    • B66C23/90—Devices for indicating or limiting lifting moment
    • B66C23/905—Devices for indicating or limiting lifting moment electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/084—Protection measures

Definitions

  • ABSTRACT A system for use with cranes which have booms that may be varied in length and angular relationship which continuously displays the operating radius and provides for a display of the boom length by pressing a button and which provides alarms to the operator for both radius and length of boom.
  • the present invention comprises a computer which continuously solves the equation for the operating radius of the crane based on the angle of the boom and the length of the boom as well as the offset from the pivot point of the boom relative to the vertical pivot point of the crane.
  • the cosine of the angle of the boom is obtained from an angle potentiometerof the type controlled by a pendulum which drives a cosine potentiometer to produce an output of the cosine of the boom angle-A boom length transducer produces an output which continually monitors the length of the boom and the lengthof the boom signal is combined with the cosine 0 signal.
  • the operating radius of the boom is continuously indicated by a meterand an alarm system receives inputs so as to produce alarms under conditions which are deemed dangerous. Switching means are provided so as to convert the radius indication to a length of boom readout when desired.
  • FIG. 1 is a side view of the crane with the system of the invention installed
  • FIG. 2 is a schematic diagram of the indicating and warning system of the invention.
  • FIG. 3 illustrates the relationships of the boom angle and length to the crane pivot point.
  • FIG. 1 is a view of a crane which is mounted on a truck bed 8 such that the crane pivots about a vertical pivot axis 9.
  • the boom 11 is extensible and pivotable about a horizontal axis.
  • the hook 12 is mounted at the end of boom for supporting loads.
  • the operating radius R of the crane is the distance from the vertical pivot axis 9 to the projection on the horizontal plane of the end of the crane beneath the hook 12.
  • the distance K is the offset from the vertical pivot axis 9 and the horizontal pivot axis of the crane and can be or depending upon the relationship of the crane relative to the vertical pivot axis 9.
  • the length of the boom is indicated as L and the 2 crane angle is indicated by the angle 0.
  • the operating radius R is equal to (L cos. 6) K, where R is the operating radius in feet measured from the center rotation of the cab. horizontally to the hook.
  • K is the boom pivot to cab pivot distance which is a constant for any given machine.
  • the boom 11 has mounted therein a boom length transducer 14 and an angle potentiometer 13 which may be a pendulum controlled device.
  • FIG. '2 is a schematic view of the indicating and warn- I ing system of this invention.
  • the cosine angle potentiometer 13. has one side connected to ground and includes a winding R and a wiper contact 18 which is controlled by a pendulum 19- so. as to produce an output equal to the cosine 0.
  • the ungrounded side of winding R is connected to one end of a variable resistor R for calibrating purposes which has its other side connected to terminal 16 that is connected to a suitable B+ supply.
  • a switch S normally engages contact 15 which is connected to wiper contact 18 but can be moved to engage contact 17 which is. connected to the junction point between resistors R and R
  • a voltage follower circuit 21 is connected to switch S and has an output terminal connected to one end of.
  • the other end of the length potentiometer R is connected to one end of a resistor R which is a calibrating resistor which'has its other end connected to ground.
  • a wiper contact 20 moves in-response to the variation in the length of the boom ll and supplies aninput to a-voltage follower 22.
  • the calibrating resistor R is also connected to the output of the voltage follower 21 and has its other side connected to an alarm switch for setting the length alarm which is designated as R
  • the other side of resistor R is connected to ground.
  • a wiper contact 29 engages resistor and supplies an input to a differential amplifier 2,4 which also receives an input from wiper contact 20.
  • a terminal 25 is connected to 8+ and has its other side connected to' acalibrating resistor R which has its other side connected to a resistor R form,- ing a potentiometer which has its other side connected to ground.
  • a wiper contact 28 allows the radius alarm end of a resistor R which has its other end connected to a calibrating resistor R whose other side is connected to a radius-length meter 31.
  • a condenser C is connected from a junction point between resistors R and R and ground. Switch S normally engages contact 32 at the junction point between resistor R and meter 31 and is movable to engage an open circuit 4 contact 33.
  • a resistor R is connected to switch contact S and has its other side connected to wiper contact 36 which engages a slide resistor R The contact 36 allows the boom pivot to cab pivot distance to be set into the computer.
  • One end of the resistor R is connected to resistor R which has its opposite side grounded.
  • a resistor R is connected to the other end of resistor R and has its other side connected to terminal 34 which is connected to B+.
  • a gate circuit 26 receives inputs from the differential amplifiers 23 and 24 and has an output terminal 37 which is normally engaged by switch 5 which is movable to engage an open circuit contact 38.
  • a power 3 switch 27 receives an input from switch S and supplies an output to an alarm 28 which might be an audible alarm and which has its other side connected to ground and to a visible alarm 29 which might be a light, which has its opposite side connected to ground.
  • a push botton 41 is connected by mechanical linkages 42, 43 and 44 to the switches S S and 8;, so as to move them from their normal position as shown in FIG. 2 to their second positions wherein the switch S engages contact 17, switch S engages contact 33, and the switch S engages contact 38.
  • the circuitry of FIG. 2 comprises a simple analog computer for solving the equation R L cos.0+ K.
  • the output of the voltage follower 21 consists of a signal cos.6 when switch S engages wiper contact 18.
  • the signal is supplied to one end of resistor R and the signal on wiper contact 20 is equal to L cos.0.
  • This signal is equal to the actual radius of the boom 11 rather than the operating radius R and is fed to the meter 31 through the voltage follower operational amplifier 22 which is offset by the constant current sources R and R to provide the value K in the computer.
  • Value K is the boom pivot to cab pivot distance and is a constant for any machine and once set need not be further adjusted for any particular crane.
  • the meter 31 will continuously read the operating radius R as the length and the angle of the boom 1 1 is varied by the operator.
  • the push button switch 41 is depressed thus moving the switches S S and S to respectively engage contacts 17, 33 and 38, and the meter 31 will provide a direct readout of the length of the boom. This is because when switch S is moved to engage contact 17, the cos. 6 from the cosine potentiometer 13 is equal to 1 and K is equal to because switch S has been opened thus removing the K offset to the meter 31. It is to be realized, of course, that the meter 31 should be calibrated in the same units for both radius and length as, for example, feet.
  • the alarm circuits may be digital type circuits as, for example, to provide direct reading and alarm settings.
  • the radius alarm is set by the wiper contact 28 and the calibration resistor R so that the gate 26 will energize the power switch 27 to turn on the alarms 28- and 29 if the operating radius exceeds the preset limit.
  • the length alarm is established by the wiper contact 29 which receives a signal proportional to the L cos 6 from which is substracted in the differential amplifier 24 L cos Osignal.
  • the outputs of the amplifiers 23 and 24 are both supplied to the gate circuit 26 such that the alarms 28 and 29 will be energized in the event either or both of the operating radius or length maximums are exceeded. 1
  • this invention continuously monitors the operating radius and indicates to an operator the operating radius.
  • the computer will also indicate the length of the boom when the switches S S and S are energized by the push button 41 and thus the operator can continually monitor the operating radius and observe the boom length by merely pushing the push button 41.
  • An operating radius and length indicator for a crane having an adjustable angle and length boom comprising: first means mounted on the boom for producing a signal cos 0 proportional to the cosine of the angle of the boom relative to the horizontal; and second means variable "in response to the length of the boom receiving the output of said first means to produce a signal L cos 0 proportional to the length of the projection of the boom on the horizontal plane, means for setting a first threshold representation of a maximum L cos 0 signal, a first differential amplifier receiving said L cos 0 from said second means and a signal maximum L cos 0 signal from said first threshold means, means for setting a second threshold corresponding to a maximum length of the boom, a second differential amplifier receiving signals from said second means and said means for setting said second threshold; a gate receiving the outputs of said first and second differential amplifiers, and an alarm connected to the output of said gate such that an alarm is given if either threshold is reached.
  • An operating radius and length indicator for a crane including first, second, and third switches with the first switch connected to said first means for producing said cos 6 signal to convert its output to one and wherein said boom is supported by a horizontal pivot axis from a cab which is rotatable about a vertical axis of said crane, means producing a signal K proportional to the horizontal offset distance from said vertical axis to said horizontal pivot axis and an indicator means receiving'inputs from said means producing said K signal and said second means producing said fL cos 6 signal to produce an indication of theoperating radius, said second switch connected between said indicator and said means proproduces an indication of boom length.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
US00297062A 1972-10-12 1972-10-12 Boom length operating radius indicator and warning device Expired - Lifetime US3833932A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US00297062A US3833932A (en) 1972-10-12 1972-10-12 Boom length operating radius indicator and warning device
CA182,506A CA1000856A (en) 1972-10-12 1973-10-02 Boom length operating radius indicator and warning device
DE19732350904 DE2350904A1 (de) 1972-10-12 1973-10-10 Vorrichtung zur angabe des betriebsradius und der laenge des auslegers eines krans
IT29986/73A IT995774B (it) 1972-10-12 1973-10-10 Sistema indicatore e di avverti mento per l indicazione continua del raggio operativo e della lun ghezza del braccio di una gru
FR7336467A FR2202842B1 (enrdf_load_stackoverflow) 1972-10-12 1973-10-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00297062A US3833932A (en) 1972-10-12 1972-10-12 Boom length operating radius indicator and warning device

Publications (1)

Publication Number Publication Date
US3833932A true US3833932A (en) 1974-09-03

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ID=23144698

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US00297062A Expired - Lifetime US3833932A (en) 1972-10-12 1972-10-12 Boom length operating radius indicator and warning device

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US (1) US3833932A (enrdf_load_stackoverflow)
CA (1) CA1000856A (enrdf_load_stackoverflow)
DE (1) DE2350904A1 (enrdf_load_stackoverflow)
FR (1) FR2202842B1 (enrdf_load_stackoverflow)
IT (1) IT995774B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3922789A (en) * 1974-12-11 1975-12-02 Koehring Co Boom length sensing system with two-block condition sensing
US3987906A (en) * 1974-01-04 1976-10-26 Erhard Kirsten Apparatus for preventing the tilting of telescopic jib cranes
US3993166A (en) * 1975-04-29 1976-11-23 Bofors America, Inc. Overload signalling system for fork lift trucks and the like
US3997071A (en) * 1975-08-14 1976-12-14 Laserplane Corporation Method and apparatus for indicating effective digging depth of a backhoe
US4054055A (en) * 1976-08-06 1977-10-18 Precilec Device for controlling the load of a lifting appliance
US4205308A (en) * 1977-11-21 1980-05-27 Fmc Corporation Programmable alarm system for marine loading arms
US4395706A (en) * 1980-06-30 1983-07-26 Jlg Industries, Inc. Boom limit safety control circuit
US4402350A (en) * 1979-11-12 1983-09-06 Fmc Corporation System for the control of a marine loading arm
USRE32366E (en) * 1980-06-30 1987-03-03 Jlg Industries, Inc. Boom limit safety control circuit
CN104843616A (zh) * 2015-04-17 2015-08-19 徐州徐工随车起重机有限公司 一种高空作业车臂架及其工作半径的控制方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079080A (en) * 1960-02-12 1963-02-26 Henry L Mason Crane warning system
US3269560A (en) * 1964-12-28 1966-08-30 Drott Mfg Corp Safety control for cranes
US3489294A (en) * 1968-04-25 1970-01-13 Bucyrus Erie Co Load limit control for hoisting equipment
US3549876A (en) * 1968-03-07 1970-12-22 Eaton Yale & Towne Crane operating radius indicator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3505514A (en) * 1967-11-13 1970-04-07 Eaton Yale & Towne Load warning device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3079080A (en) * 1960-02-12 1963-02-26 Henry L Mason Crane warning system
US3269560A (en) * 1964-12-28 1966-08-30 Drott Mfg Corp Safety control for cranes
US3549876A (en) * 1968-03-07 1970-12-22 Eaton Yale & Towne Crane operating radius indicator
US3489294A (en) * 1968-04-25 1970-01-13 Bucyrus Erie Co Load limit control for hoisting equipment

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987906A (en) * 1974-01-04 1976-10-26 Erhard Kirsten Apparatus for preventing the tilting of telescopic jib cranes
US3922789A (en) * 1974-12-11 1975-12-02 Koehring Co Boom length sensing system with two-block condition sensing
US3993166A (en) * 1975-04-29 1976-11-23 Bofors America, Inc. Overload signalling system for fork lift trucks and the like
US3997071A (en) * 1975-08-14 1976-12-14 Laserplane Corporation Method and apparatus for indicating effective digging depth of a backhoe
US4054055A (en) * 1976-08-06 1977-10-18 Precilec Device for controlling the load of a lifting appliance
US4205308A (en) * 1977-11-21 1980-05-27 Fmc Corporation Programmable alarm system for marine loading arms
US4402350A (en) * 1979-11-12 1983-09-06 Fmc Corporation System for the control of a marine loading arm
US4395706A (en) * 1980-06-30 1983-07-26 Jlg Industries, Inc. Boom limit safety control circuit
USRE32366E (en) * 1980-06-30 1987-03-03 Jlg Industries, Inc. Boom limit safety control circuit
CN104843616A (zh) * 2015-04-17 2015-08-19 徐州徐工随车起重机有限公司 一种高空作业车臂架及其工作半径的控制方法

Also Published As

Publication number Publication date
FR2202842A1 (enrdf_load_stackoverflow) 1974-05-10
DE2350904A1 (de) 1974-04-18
IT995774B (it) 1975-11-20
FR2202842B1 (enrdf_load_stackoverflow) 1977-05-27
CA1000856A (en) 1976-11-30

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