GB1183190A - Crane Radius Indicator or Crane Safe-Load Indicator Radius Compensating Device - Google Patents

Crane Radius Indicator or Crane Safe-Load Indicator Radius Compensating Device

Info

Publication number
GB1183190A
GB1183190A GB3755567A GB3755567A GB1183190A GB 1183190 A GB1183190 A GB 1183190A GB 3755567 A GB3755567 A GB 3755567A GB 3755567 A GB3755567 A GB 3755567A GB 1183190 A GB1183190 A GB 1183190A
Authority
GB
United Kingdom
Prior art keywords
jib
crane
indicator
radius
screw
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.)
Expired
Application number
GB3755567A
Inventor
Robert Loudon Aitken
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.)
B & A Engineering Co Ltd
Original Assignee
B & A Engineering Co 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 B & A Engineering Co Ltd filed Critical B & A Engineering Co Ltd
Priority to GB3755567A priority Critical patent/GB1183190A/en
Publication of GB1183190A publication Critical patent/GB1183190A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

1,183,190. Safe-load indicators for cranes with telesopic jibs. B. & A. ENG. CO. Ltd. 12 Aug.. 1968 [15 Aug., 1967], No. 37555/67. Heading B8B. A crane radius indicator device or a crane safe-load indicator radius compensating device for a crane having an extensible jib comprises, as shown in Fig. 2, a stationary casing 1 secured to the crane superstructure A adjacent the jib pivot axis 2. An indicator member 3, mounted on parallel links 4, 5 pivoted to the casing 1, is movable along a support formed by a drive screw 11 driven through bevel gears 12, 14 actuated by a spring drum 10 rotated by a cable 9 attached to the jib peak. A follower in the form of a trunnion nut 15 is thus moved along the screw 11 in proportion to the effective length of the jib. The screw 11 is arranged radially in relation to the jib pivot axis 2 and pivots about that axis. The nut 15 runs in a vertical slot 8 in the indicator member, and the horizontal distance of the slot 8 relative to the axis 2 is proportional to the operating radius of the crane (considered as the product of the effective length of the jib and the cosine of the jib angle). The slot 8 has an additional terminal portion 18 which is not aligned with the main portion, so that when the jib as fully raised the indicated radius exceeds the true radius because the limiting factor is not the overturning moment of the load, but the strength of the jib. The indicator member 3 is linked with an indicator pointer (not shown) through lever 16, forming an extension of parallel link 5. The lever may additionally, or alternatively, be linked with a safeload indicator such as that described in Specification 723,070 so as to compensate it for change of crane operating radius. In the alternative construction shown in Fig. 4, support screw 11<SP>1</SP> and the ,indicator member 3<SP>1</SP> are mounted in a common casing for support by the jib. Lever 18<SP>1</SP> is connected by a link to form a parallel motion linkage with a similar lever (not shown) coaxial with the jib pivot so that lever 18<SP>1</SP> remains at a fixed inclination to the ground as the jib luffs. Luffing of the jib thus causes a tilting movement of the screw 11<SP>1</SP> in relation to casing 1<SP>1</SP> and there is produced a relative movement between screw 11<SP>1</SP> and indicator member 3<SP>1</SP> corresponding to that between screw 11 and indicator member 3 as described above.
GB3755567A 1967-08-15 1967-08-15 Crane Radius Indicator or Crane Safe-Load Indicator Radius Compensating Device Expired GB1183190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3755567A GB1183190A (en) 1967-08-15 1967-08-15 Crane Radius Indicator or Crane Safe-Load Indicator Radius Compensating Device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3755567A GB1183190A (en) 1967-08-15 1967-08-15 Crane Radius Indicator or Crane Safe-Load Indicator Radius Compensating Device

Publications (1)

Publication Number Publication Date
GB1183190A true GB1183190A (en) 1970-03-04

Family

ID=10397344

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3755567A Expired GB1183190A (en) 1967-08-15 1967-08-15 Crane Radius Indicator or Crane Safe-Load Indicator Radius Compensating Device

Country Status (1)

Country Link
GB (1) GB1183190A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2207853A1 (en) * 1972-11-27 1974-06-21 Ppm Sa
FR2476049A1 (en) * 1980-02-20 1981-08-21 Cella Spa DEVICE FOR LIMITING A LIFTING APPARATUS WITH TELESCOPIC OR ARTICULATED JOINT AND TELESCOPIC ELONGATION ARMS

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2207853A1 (en) * 1972-11-27 1974-06-21 Ppm Sa
FR2476049A1 (en) * 1980-02-20 1981-08-21 Cella Spa DEVICE FOR LIMITING A LIFTING APPARATUS WITH TELESCOPIC OR ARTICULATED JOINT AND TELESCOPIC ELONGATION ARMS

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee