US3909817A - Overload safety device for telescopic cranes - Google Patents

Overload safety device for telescopic cranes Download PDF

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Publication number
US3909817A
US3909817A US353716A US35371673A US3909817A US 3909817 A US3909817 A US 3909817A US 353716 A US353716 A US 353716A US 35371673 A US35371673 A US 35371673A US 3909817 A US3909817 A US 3909817A
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US
United States
Prior art keywords
force measuring
upper carriage
measuring cell
luffing cylinder
safety device
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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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US353716A
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English (en)
Inventor
Ludwig Pietzsch
Gerd Huhne
Knud Overlach
Peter Fuchs
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PIETZSCH ING LUDWIG DR
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Individual
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Assigned to PIETZSCH, ING. LUDWIG DR., reassignment PIETZSCH, ING. LUDWIG DR., ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FUCHS, PETER, OVERLACH, KNUD, HUHNE, GERD, PIETZSCH, LUDWIG
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • An overload safety device for jib cranes includes a transmitter for registering a working radius and a transmitter for registering a load applied to the jib wherein the crane comprises an upper carriage. a base jib member. and a luffing cylinder interconnecting the upper carriage and the base jib member. the transmitter for registering a load including a force measuring cell connected in a force path from the upper carriage through the luffing cylinder to the base jib member.
  • the invention relates to oyerload safety device for telescopic cranes and, more particularly, to such overload safety device for telescopic cranes having transmitters for registering the working radius and the load as well as an analog computer-wherein the nominal value predetermined by the working radius is compared with the actual values furnished by the transmitter for registering the load, and, when the actual values are equal to' the nominal values, an overload signal is released.
  • the permissible load'values' are given as the nominal values.
  • the load transmitters are force transmitters whose actual values are compared to the nominal values.
  • the safety device attained in this manner is unsatisfactory especially for telescopic cranes since tilting or tipping thereof can occur not only due to a too-heavy load but also due to an excessive working radius of the jib.
  • the moment ofthe jib weight' can be as'much as '10 times the load moment for large working radii.
  • external forces such as wind forces, diagonal pulling a'nd'too-great acceleration can also help produce tipping of the crane.
  • the force measuring cell is connected into the piston rod of the luffmg cylinder.
  • the forced measuring cell is located distant from the parts of the luffing cylinder that are directly displaced during operation thereofThe farther the pivot point is located away from the force measuring cell,- the smaller the part of the load is that is transmitted through the force measuring cell, whereby this load component remains representative, however, for the respective total load.
  • the force measuring cell of this embodiment can consequently be of smaller dimensions than if the entire load were transmitted therethrough.
  • a preferred spacing of the pivot point from the secured end of the intermediate carrier is substantially equal to half the spacing between both support locations of the intermediate carrier. The stress applied to the force measuring cell is therefore only half as great as the component to be applied by the luffing cylinder which is normal to the base jib member.
  • FIGS. 1a and lb are side elevational views of two embodiments of a telescopic crane of mobile type having a conventional construction
  • FIG. 2 is a fragmentary enlarged view of FIG. 1 showing the luffing or whipping cylinder of the telescopic crane with a load transmitter according to the invention; 7
  • FIG. 4 is a fragmentary view of the upper end of the luffing cylinder showing another arrangment of the load transmitters of FIGS. 2 and 3.
  • FIGS.' la and 1b there is shown therein a mobile telescopic crane which includes an undercarriage 101 and an upper carriage 103 rotatable about a verti cal axis 102 with respect to the undercarriage 101.
  • the rear end of the base jib member 104 is pivotally connected, while a luffing cylinder 106, 106' is pivotally connected at 105 to the upper carriage 103.
  • the luffing cylinder 106 is pivoted at 107 and the luffing cylinder 106' is pivoted at 107' to the base jib member 104.
  • the luffing cylinder 106 and the pivot 107, on the one hand, and the luffing cylinder 106' and the pivot 107, on the other hand, aretwo alternative embodiments of conventionally employed means for pivoting the luffing cylinder or the base jib member.
  • the luffing cylinder 106 is inclined in the same direction as that of the base jib member 104, although at a lesser angle of inclination with respect to the vertical, in the second type of support shown in FIG. lb, the luffing cylinder 106 is generally inclined in opposite direction to the inclination of the base jib member.
  • the invention of the instant application is applicable equally to both of the types of support shown in FIGS. 1a and 1b, however, in FIGS. 2 to 4, only the application of the invention to the type of support of FIG. 1a i.e. the luffing cylinder 106 at the pivot 107, is shown.
  • FIGS. 2 to 4 the same or similar members are identified by the corresponding reference numerals employed in FIG. la.
  • the luffing cylinder 106 is not directly connected articulatingly to the basejib member 104. Rather, the upper pivot point 117 is provided at an intermediate carrier 108 which is secured at one of its ends 109 to the base jib member 104, and between the other free end 110 thereof and the base jib member 104, there is mounted a force measuring box 111.
  • the force measuring box 111 can be secured to the end 110 of the intermediate carrier 108 or to the base jib member 104. From FIG.
  • the contstruction of the embodiment of FIG. 3 differs from that of FIG. 2 in that the intermediate carrier 108 is coordinated with the force measuring box 111 to thelower pivot point 115 of the luffing cylinder 106 instead of to the upper pivot point 107 thereof.
  • the intermediate carrier 108 is secured by one end 109 thereof to the upper carriage 103, while the force measuring box 111 is disposed between the other, free end 110 of the intermediate carrier and the upper carriage.
  • the pivot point 115 is also provided in this case again between both support locations 109 and l l l at the intermediate carrier 108.
  • a force measuring box 121 is directly connected into the piston rod 122 of the luffing cylinder 123.
  • the total force transmitted along the luffing cylinder is measured by the force measuring box 121.
  • a casing 124 connected at 125 to the foot of the piston rod 122 is provided, the casing 124 being slidingly guided by an inner guide member 126 on the outer peripheral surface of the luffing cylinder 123.
  • Overload safety device for jib cranes comprising transmitter means for registering a working radius and transmitter means for registering a load applied to the jib wherein the crane comprises an upper carriage member, a base jib member, and a luffing cylinder interconnecting said upper carriage member and said base jib member, said transmitter means for registering a load comprising a force measuring cell connected in a force path from said upper carriage member through said luffing cylinder to said base jib member.
  • Overload safety device wherein said luffing cylinder is operatively and pivotally connected by respective pivots to said upper carriage member and said base jib member, and said transmitter means comprises at least one force measuring cell coordinated with at least one of said pivots, said one pivot being located on an intermediate carrier having a pairof spaced support locations, one of said support locations being secured to said base jib member, said intermediate carrier having a free arm, said force measuring cell being disposed as a second support location between said free arm and said base jib member.
  • Overload safety device wherein said luffing cylinder is operatively and pivotally connected by respective pivots to said upper carriage member and said base jib member, and said transmitter means comprises at least one force measuring cell coordinated with at least one of said pivots, said one pivot being located on an intermediate carrier having a pair of spaced support locations, one of said support locations being secured to said upper carriage member, said intermediate carrier having a free arm, said force measuring cell being disposed as a second support location between said free arm and said upper carriage member.
  • Overload safety device according to claim 1 wherein said luffing cylinder includes a displaceable piston rod, and said force measuring cell is connected in the piston rod.
  • Overload safety device wherein said luffing cylinder is operatively and pivotally connected by respective pivots to said upper carriage member and said base jib member and said transmitter means comprises at least one force measuring cell coordinated with at least one of said pivots, said one pivot being located on an intermediate carrier having a pair of spaced support locations, one of said support locations being secured to one of said members, said intermediate carrier having a free arm, said force measuring cell being disposed as a second support location between said free arm and said one member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US353716A 1970-01-29 1973-04-23 Overload safety device for telescopic cranes Expired - Lifetime US3909817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2004041A DE2004041C3 (de) 1970-01-29 1970-01-29 überlastsicherung für Auslegerkrane, insbesondere Teleskopkrane

Publications (1)

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US3909817A true US3909817A (en) 1975-09-30

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US353716A Expired - Lifetime US3909817A (en) 1970-01-29 1973-04-23 Overload safety device for telescopic cranes

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US (1) US3909817A (de)
DE (1) DE2004041C3 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039084A (en) * 1971-07-06 1977-08-02 Tadano Ironworks Co., Ltd. Safety-guard for a crane
CN105417415A (zh) * 2015-12-22 2016-03-23 中联重科股份有限公司 基于动臂塔式起重机的防后倾保护方法、装置和系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2265332C2 (de) * 1971-07-06 1985-05-02 Tadano Ironworks Co.Ltd., Takamatsu Überlastsicherung für Auslegekrane, insbesondere Teleskopkrane
AU1534983A (en) * 1982-10-12 1984-04-19 Jlg Industries, Inc. Load measuring apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489294A (en) * 1968-04-25 1970-01-13 Bucyrus Erie Co Load limit control for hoisting equipment
US3638212A (en) * 1968-10-16 1972-01-25 Pietzsch Ludwig Overload safety device for jib cranes
US3724679A (en) * 1971-02-19 1973-04-03 Clark Equipment Co Indicator or control for cranes
US3771667A (en) * 1972-06-05 1973-11-13 J Becker Moment monitoring system for boom-cable type cranes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489294A (en) * 1968-04-25 1970-01-13 Bucyrus Erie Co Load limit control for hoisting equipment
US3638212A (en) * 1968-10-16 1972-01-25 Pietzsch Ludwig Overload safety device for jib cranes
US3724679A (en) * 1971-02-19 1973-04-03 Clark Equipment Co Indicator or control for cranes
US3771667A (en) * 1972-06-05 1973-11-13 J Becker Moment monitoring system for boom-cable type cranes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4039084A (en) * 1971-07-06 1977-08-02 Tadano Ironworks Co., Ltd. Safety-guard for a crane
CN105417415A (zh) * 2015-12-22 2016-03-23 中联重科股份有限公司 基于动臂塔式起重机的防后倾保护方法、装置和系统

Also Published As

Publication number Publication date
DE2004041B2 (de) 1972-06-08
DE2004041C3 (de) 1975-10-09
DE2004041A1 (de) 1971-10-28

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AS Assignment

Owner name: PIETZSCH, ING. LUDWIG DR., 7500 ROSENGARTLE 14, 75

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:PIETZSCH, LUDWIG;HUHNE, GERD;OVERLACH, KNUD;AND OTHERS;REEL/FRAME:004479/0768;SIGNING DATES FROM 19850809 TO 19850923