GB1171637A - Sheave arrangements for Limiting Load Moments of Jib Cranes - Google Patents

Sheave arrangements for Limiting Load Moments of Jib Cranes

Info

Publication number
GB1171637A
GB1171637A GB5161866D GB5161866D GB1171637A GB 1171637 A GB1171637 A GB 1171637A GB 5161866 D GB5161866 D GB 5161866D GB 5161866 D GB5161866 D GB 5161866D GB 1171637 A GB1171637 A GB 1171637A
Authority
GB
United Kingdom
Prior art keywords
jib
cam
sheave
pin
outer ring
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
GB5161866D
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.)
Bialskie Zaklady Urzadzen Tech
Original Assignee
Bialskie Zaklady Urzadzen Tech
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
Priority claimed from PL111667A external-priority patent/PL52445B1/pl
Application filed by Bialskie Zaklady Urzadzen Tech filed Critical Bialskie Zaklady Urzadzen Tech
Publication of GB1171637A publication Critical patent/GB1171637A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
    • B66D3/06—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage with more than one pulley
    • B66D3/08—Arrangements of sheaves
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D2700/00—Capstans, winches or hoists
    • B66D2700/02—Hoists or accessories for hoists
    • B66D2700/026—Pulleys, sheaves, pulley blocks or their mounting
    • B66D2700/028—Pulley blocks with multiple sheaves

Landscapes

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

Abstract

1,171,637. Safety devices for jib cranes. BIALSKIE ZAKLADY URZADZEN TECHNICZNYCH. 17 Nov., 1966 [18 Nov., 1965], No. 51618/66. Heading B8B. A sheave arrangement for limiting load moments of a jib crane comprises an outer ring 1 with a groove for a rope or chain 6. The outer ring 1 is rotatably mounted on an inner ring 2 pivotally mounted on a sheave pin 5 in a jib 8 through intermediate resilient members 4 and a shackle 3. The rotary axis of the outer ring 1 is offset from the pivotal axis of the inner ring 2. A cam 10 is rigidly mounted on the pin 5, Fig. 2 (not shown), and co-operates with a spring-loaded cam follower on an arm 11 pivotally mounted on the inner ring 2 and arranged to co-operate with a micro-switch 9 which, when actuated, either stops the crane machinery or sounds an alarm. At any particular luffing angle of the jib 8 the forces acting on the sheave cause the axes of the outer and inner rings 1, 2 to lie on the reaction R, this causes an appropriate part of the cam 10 to come under the cam follower so that the microswitch 9 is operated when the load detected by the deflection of the rssilient members 4 is the maximum for that particular luffing angle. Instead of being fixed to the jib 8 the cam 10 may be pendulously mounted on the pin 5 and remain upright under gravity, the cam profile being modified appropriately.
GB5161866D 1965-11-18 1966-11-17 Sheave arrangements for Limiting Load Moments of Jib Cranes Expired GB1171637A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL111667A PL52445B1 (en) 1965-11-18

Publications (1)

Publication Number Publication Date
GB1171637A true GB1171637A (en) 1969-11-26

Family

ID=19948544

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5161866D Expired GB1171637A (en) 1965-11-18 1966-11-17 Sheave arrangements for Limiting Load Moments of Jib Cranes

Country Status (6)

Country Link
CH (1) CH455200A (en)
DE (1) DE1456426B2 (en)
FR (1) FR1500669A (en)
GB (1) GB1171637A (en)
NL (1) NL6616284A (en)
SE (1) SE339742B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2096667B1 (en) * 1970-05-14 1973-11-16 Haulotte Georges

Also Published As

Publication number Publication date
SE339742B (en) 1971-10-18
FR1500669A (en) 1967-11-03
DE1456426A1 (en) 1969-10-09
NL6616284A (en) 1967-05-19
DE1456426B2 (en) 1970-11-26
CH455200A (en) 1968-04-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees