US2866247A - Safety lock for crane hook - Google Patents

Safety lock for crane hook Download PDF

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Publication number
US2866247A
US2866247A US539765A US53976555A US2866247A US 2866247 A US2866247 A US 2866247A US 539765 A US539765 A US 539765A US 53976555 A US53976555 A US 53976555A US 2866247 A US2866247 A US 2866247A
Authority
US
United States
Prior art keywords
safety lock
latch bar
locking member
crane hook
hook
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 - Lifetime
Application number
US539765A
Inventor
Harold A Clegg
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.)
United States Steel Corp
Original Assignee
United States Steel Corp
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 United States Steel Corp filed Critical United States Steel Corp
Priority to US539765A priority Critical patent/US2866247A/en
Priority to GB27374/56A priority patent/GB798247A/en
Priority to FR1156711D priority patent/FR1156711A/en
Application granted granted Critical
Publication of US2866247A publication Critical patent/US2866247A/en
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
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
    • B66C1/34—Crane hooks
    • B66C1/36—Crane hooks with means, e.g. spring-biased detents, for preventing inadvertent disengagement of loads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B45/00—Hooks; Eyes
    • F16B45/02—Hooks with pivoting or elastically bending closing member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B45/00—Hooks; Eyes
    • F16B45/02—Hooks with pivoting or elastically bending closing member
    • F16B45/023—Hooks with pivoting or elastically bending closing member the closing member pivoting about an axis perpendicular to the plane of the hook
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B45/00—Hooks; Eyes
    • F16B45/02—Hooks with pivoting or elastically bending closing member
    • F16B45/027—Hooks with pivoting or elastically bending closing member and having position-locking means for the closing member
    • F16B45/028—Hooks with pivoting or elastically bending closing member and having position-locking means for the closing member the position-locking means being pivotally connected
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T24/00—Buckles, buttons, clasps, etc.
    • Y10T24/45—Separable-fastener or required component thereof [e.g., projection and cavity to complete interlock]
    • Y10T24/45225—Separable-fastener or required component thereof [e.g., projection and cavity to complete interlock] including member having distinct formations and mating member selectively interlocking therewith
    • Y10T24/45272—Projection passes through cavity then moves toward noninserted portion of its member to complete interlock [e.g., snap hook]
    • Y10T24/45288—Hook type projection member
    • Y10T24/45304—Noninserted portion of projection member includes movably connected gate for closing access throat
    • Y10T24/45319—Pivotally connected gate
    • Y10T24/45361—Pivotally connected gate having position locking-means for gate
    • Y10T24/45366—Locking-means pivotally connected

Definitions

  • the present invention relates generally to lift cranes and more particularly to a safety lock for a lift crane hook.
  • 'It is an object of my invention to provide a safety lock which may be easily installed on a lift crane hook for blocking the throat thereof to prevent accidental displacement of an article carried by the hook.
  • Figure l is a side elevational view showing the safety lock of the invention in closed position
  • Figure 2 is a view similar to Figure 1 showing the safety lock of the invention in open position;
  • Figure 3 is an end view looking toward the left of Figure 1.
  • reference numeral 2 designates a crane hook having the safety lock of my invention installed thereon.
  • the hook 2 is conventional in structure and is comprised of a shank 6, body 8, point and throat 12.
  • a split bracket 14 having two parallel spaced arms 16 projecting outwardly therefrom is mounted on the shank 6 of the hook by nut and bolt means 18.
  • the arms 16 project in a plane spaced above the throat 12 of the hook.
  • a latch bar 20 is pivotally attached at one end between the arms 16 by means of a pivot pin 22 which is attached to and extends between the lower inside corners of arms 16.
  • the latch bar 20 is of such length as to span the throat 12 and engage the tip portion 10 with its free end 24 when the bar is pivoted downwardly from the bracket, as shown in Figure 1.
  • a counterweighted locking member 26 is pivotally mounted between the arms 16 by means of a pivot pin 28 which is attached to and extends between the upper and forward portions of the arms 16.
  • the locking member 26 is provided with a straight side 30 which contacts the upper surface 32 of the latch bar when the latter is in elevated or open position, as shown in Figure 2.
  • the locking member 26 is also provided with an enlarged counterweighted portion 34 which has a cam surface 36 which engages and locks the latch bar 20 against the point 10 of the hook.
  • the latch bar 20 is normally in locking position as shown in Figure 1 since it is free to pivot by its own weight.
  • the locking member 26 In operation, to elevate the latch bar 20 to open position the locking member 26 is rotated in the clockwise direction by applying force manually against the surface ance of the throat of the hook at all times.
  • the latch member After the locking member has been rotated to the position shown in Figure 2 the latch member is lifted and held in elevated position until the crane hook is loaded or unloaded. Then the latch bar is released causing it to fall against the tip portion iii of the hook and again block the throat 12.
  • the latch bar is automatically locked in this position by means of the locking member 26 which due to its counterweighted shape rotates counterclockwise when the latch bar is released and engages the upper surface 32 of the latch bar with its cam surface 36.
  • the latch bar is maintained in locking position by the locking member regardless of the pressure which may be applied to its underside by the shifting of rings, slings or other articles being carried on the hook.
  • the safety lock of my invention provides a positive means for restricting the clear- Although it assumes locking position automatically it requires manual manipulation of the locking member 26 to release the safety lock from locking position.
  • a safety lock which comprises a bracket removably mounted on said shank, said bracket including a split collar body portion removably mounted around said shank, a pair of spaced parallel arms projecting from said body portion in a horizontal plane above said throat, a pivot pin extending between the inner and lower ends of said arms, a latch bar pivotally mounted by one end on said pivot pin between said arms, said latch bar being of such length as to span said throat and extend to said tip portion for engagement therewith to block said throat when the latch bar is pivoted downwardly from said bracket, said latch 'bar being freely pivotal on said pin whereby it normally assumes throat-blocking position by gravity through its own weight, a second pivot pin extending between the upper bracket removably mounted on said shank, said bracket including a split collar body portion removably mounted around said shank, a pair of spaced parallel arms projecting from said body portion in a horizontal plane above said throat, a pivot pin extending between the inner and lower ends of said arms, a latch bar pivotally mounted by one end on

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • Jib Cranes (AREA)

Description

Dec. 30, 1958 CLEGG 2,866,247
SAFETY LOCK FOR CRANE HOOK Filed Oct. 11, 1955 //v VE/VTOR. HAROLD A. CLEGG,
his Attorney.
United States Patent: Ofifice 2,866,247 Patented Dec. 30, 1958 SAFETY LOCK FOR CRANE HOOK Harold A. Clegg, Homestead, Pa., assignor to United States Steel Corporation, a corporation of New Jersey Application October 11, 1955, Serial No. 539,765
1 Claim. (Cl. 24-232) The present invention relates generally to lift cranes and more particularly to a safety lock for a lift crane hook.
'It is an object of my invention to provide a safety lock which may be easily installed on a lift crane hook for blocking the throat thereof to prevent accidental displacement of an article carried by the hook.
It is another object of the invention to provide a safety lock as described above which is adapted to move into blocking position by gravity and be automatically secured in blocking position by means of a counterweighted locking member.
It is a further objectof the invention to provide a safety lock as described above wherein the locking member can be released by positive manipulation only.
It is a further object of the invention to provide a safety lock for a lift crane hook which is simple and rugged in construction and positive in operation.
These and other objects will become more apparent after referring to the followin specification and attached drawings in which:
Figure l is a side elevational view showing the safety lock of the invention in closed position;
Figure 2 is a view similar to Figure 1 showing the safety lock of the invention in open position; and
Figure 3 is an end view looking toward the left of Figure 1.
Referring more particularly to the drawings, reference numeral 2 designates a crane hook having the safety lock of my invention installed thereon. The hook 2 is conventional in structure and is comprised of a shank 6, body 8, point and throat 12.
A split bracket 14 having two parallel spaced arms 16 projecting outwardly therefrom is mounted on the shank 6 of the hook by nut and bolt means 18. The arms 16 project in a plane spaced above the throat 12 of the hook. A latch bar 20 is pivotally attached at one end between the arms 16 by means of a pivot pin 22 which is attached to and extends between the lower inside corners of arms 16. The latch bar 20 is of such length as to span the throat 12 and engage the tip portion 10 with its free end 24 when the bar is pivoted downwardly from the bracket, as shown in Figure 1.
A counterweighted locking member 26 is pivotally mounted between the arms 16 by means of a pivot pin 28 which is attached to and extends between the upper and forward portions of the arms 16. The locking member 26 is provided with a straight side 30 which contacts the upper surface 32 of the latch bar when the latter is in elevated or open position, as shown in Figure 2. The locking member 26 is also provided with an enlarged counterweighted portion 34 which has a cam surface 36 which engages and locks the latch bar 20 against the point 10 of the hook. The latch bar 20 is normally in locking position as shown in Figure 1 since it is free to pivot by its own weight.
In operation, to elevate the latch bar 20 to open position the locking member 26 is rotated in the clockwise direction by applying force manually against the surface ance of the throat of the hook at all times.
38 thereof. After the locking member has been rotated to the position shown in Figure 2 the latch member is lifted and held in elevated position until the crane hook is loaded or unloaded. Then the latch bar is released causing it to fall against the tip portion iii of the hook and again block the throat 12. The latch bar is automatically locked in this position by means of the locking member 26 which due to its counterweighted shape rotates counterclockwise when the latch bar is released and engages the upper surface 32 of the latch bar with its cam surface 36. Thus, the latch bar is maintained in locking position by the locking member regardless of the pressure which may be applied to its underside by the shifting of rings, slings or other articles being carried on the hook. It will be seen that the safety lock of my invention provides a positive means for restricting the clear- Although it assumes locking position automatically it requires manual manipulation of the locking member 26 to release the safety lock from locking position.
While one embodiment of my invention has been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope of the following claim.
1 claim:
. In a crane hook having a shank, a curved portion in the shape of a bow extending arcuately downwardly and then upwardly from the lower end of said shank, a tip portion on the upper free end of said curved portion, said tip portion and said shank defining a throat therebetween, the improvement therewith of a safety lock which comprises a bracket removably mounted on said shank, said bracket including a split collar body portion removably mounted around said shank, a pair of spaced parallel arms projecting from said body portion in a horizontal plane above said throat, a pivot pin extending between the inner and lower ends of said arms, a latch bar pivotally mounted by one end on said pivot pin between said arms, said latch bar being of such length as to span said throat and extend to said tip portion for engagement therewith to block said throat when the latch bar is pivoted downwardly from said bracket, said latch 'bar being freely pivotal on said pin whereby it normally assumes throat-blocking position by gravity through its own weight, a second pivot pin extending between the upper and outer ends" of said arms, a counterweighted locking member for said latch bar pivotally mounted on said second pivot pin, said locking member having a straight side which contacts a side of said latch bar when said latch bar is in elevated position away from said point, said locking member having an enlarged counterweight portion with a cam surface adjacent said straight side for engaging said latch bar when the latter is in engagement with said tip portion in throat-blocking position, said enlarged counterweight portion being remote from said bracket whereby to rotate said locking member by gravity to engage the cam surface of said locking member with said latch bar to lock the bar against said tip portion when the free end of the latch bar is pivoted toward said tip portion away from said bracket.
References Cited in-the file of this patent UNITED STATES PATENTS 375,571 Sears et a1. Dec. 27, 1887 1,530,010 Neilson Mar. 17, 1925 1,669,805 Beer May 15, 1928 2,595,450 Coiling May 6, 1952 FOREIGN PATENTS 6,085 Great Britain 1914 87,812 Switzerland Jan. 3, 1921 1,100,137 France Mar. 30, 1955
US539765A 1955-10-11 1955-10-11 Safety lock for crane hook Expired - Lifetime US2866247A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US539765A US2866247A (en) 1955-10-11 1955-10-11 Safety lock for crane hook
GB27374/56A GB798247A (en) 1955-10-11 1956-09-06 Safety lock for crane hook
FR1156711D FR1156711A (en) 1955-10-11 1956-09-12 Crane hook safety lock

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US539765A US2866247A (en) 1955-10-11 1955-10-11 Safety lock for crane hook

Publications (1)

Publication Number Publication Date
US2866247A true US2866247A (en) 1958-12-30

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Application Number Title Priority Date Filing Date
US539765A Expired - Lifetime US2866247A (en) 1955-10-11 1955-10-11 Safety lock for crane hook

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US (1) US2866247A (en)
FR (1) FR1156711A (en)
GB (1) GB798247A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003214A (en) * 1959-03-27 1961-10-10 Bullard Co Safety hook
US3044134A (en) * 1959-05-28 1962-07-17 United States Steel Corp Safety latch for crane lift hook
US3331109A (en) * 1966-06-02 1967-07-18 Robert W Macmillan Safety latch for hooks
US4050730A (en) * 1976-05-19 1977-09-27 Akio Tada Hook latching device
US8746766B2 (en) 2012-06-07 2014-06-10 Randy Lewkoski Hook assembly
WO2014096536A1 (en) * 2012-12-20 2014-06-26 Konecranes Plc Lifting hook and safety latch for lifting hook
US10427917B2 (en) 2015-11-12 2019-10-01 Subsea Toolpool Nord As Means concerning hook

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL121005C (en) * 1960-06-16
US4539732A (en) * 1984-01-30 1985-09-10 D B Industries, Inc. Double locking safety snap
US4977647A (en) * 1989-10-27 1990-12-18 D.B. Industries, Inc. Double locking snap hook
US8752254B2 (en) 2012-02-28 2014-06-17 D B Industries, Llc Snap hook
US9707419B2 (en) 2014-10-08 2017-07-18 D B Industries, Llc Snap hook

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US375571A (en) * 1887-12-27 John f
GB191406085A (en) * 1914-03-10 1914-10-15 Frederick William Osborne Improvements in Hooks.
CH87812A (en) * 1919-07-17 1921-01-03 Badan Louis Carabiner holder.
US1530010A (en) * 1924-10-01 1925-03-17 Neilson Albert Howard Safety hook
US1669805A (en) * 1927-02-07 1928-05-15 Regan Forge & Eng Co Latch mechanism for hooks
US2595450A (en) * 1949-11-21 1952-05-06 Coffing Hoist Company Releasing type hook
FR1100137A (en) * 1954-02-26 1955-09-16 Safety device for lifting hooks and other applications

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US375571A (en) * 1887-12-27 John f
GB191406085A (en) * 1914-03-10 1914-10-15 Frederick William Osborne Improvements in Hooks.
CH87812A (en) * 1919-07-17 1921-01-03 Badan Louis Carabiner holder.
US1530010A (en) * 1924-10-01 1925-03-17 Neilson Albert Howard Safety hook
US1669805A (en) * 1927-02-07 1928-05-15 Regan Forge & Eng Co Latch mechanism for hooks
US2595450A (en) * 1949-11-21 1952-05-06 Coffing Hoist Company Releasing type hook
FR1100137A (en) * 1954-02-26 1955-09-16 Safety device for lifting hooks and other applications

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003214A (en) * 1959-03-27 1961-10-10 Bullard Co Safety hook
US3044134A (en) * 1959-05-28 1962-07-17 United States Steel Corp Safety latch for crane lift hook
US3331109A (en) * 1966-06-02 1967-07-18 Robert W Macmillan Safety latch for hooks
US4050730A (en) * 1976-05-19 1977-09-27 Akio Tada Hook latching device
US8746766B2 (en) 2012-06-07 2014-06-10 Randy Lewkoski Hook assembly
WO2014096536A1 (en) * 2012-12-20 2014-06-26 Konecranes Plc Lifting hook and safety latch for lifting hook
US9284162B2 (en) 2012-12-20 2016-03-15 Konecranes Plc Lifting hook and safety latch for lifting hook
US10427917B2 (en) 2015-11-12 2019-10-01 Subsea Toolpool Nord As Means concerning hook

Also Published As

Publication number Publication date
GB798247A (en) 1958-07-16
FR1156711A (en) 1958-05-20

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