US3921819A - Boom latch mechanism - Google Patents

Boom latch mechanism Download PDF

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Publication number
US3921819A
US3921819A US492265A US49226574A US3921819A US 3921819 A US3921819 A US 3921819A US 492265 A US492265 A US 492265A US 49226574 A US49226574 A US 49226574A US 3921819 A US3921819 A US 3921819A
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US
United States
Prior art keywords
latch
section
manual
plunger
boom
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
US492265A
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English (en)
Inventor
Stanley R Spain
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.)
Kidde Inc
Original Assignee
Walter Kidde and Co Inc
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 Walter Kidde and Co Inc filed Critical Walter Kidde and Co Inc
Priority to US492265A priority Critical patent/US3921819A/en
Priority to ZA00753335A priority patent/ZA753335B/xx
Priority to AU81473/75A priority patent/AU489141B2/en
Priority to ES438294A priority patent/ES438294A1/es
Priority to NLAANVRAGE7507319,A priority patent/NL179803C/xx
Priority to JP1975083695U priority patent/JPS5624710Y2/ja
Priority to GB26830/75A priority patent/GB1500580A/en
Priority to DE2528129A priority patent/DE2528129C2/de
Priority to FR7520044A priority patent/FR2279656A1/fr
Priority to CA230,280A priority patent/CA1023307A/en
Priority to BE157810A priority patent/BE830788A/xx
Priority to IT12691/75A priority patent/IT1033913B/it
Priority to PL1975182159A priority patent/PL117432B1/pl
Priority to BR7504763*A priority patent/BR7504763A/pt
Publication of US3921819A publication Critical patent/US3921819A/en
Application granted granted Critical
Assigned to KIDDE, INC., reassignment KIDDE, INC., CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). FILED 4-16-80 DELAWARE Assignors: WALTER KIDDE & COMPANY, INC.
Assigned to KIDDE INDUSTRIES, INC. reassignment KIDDE INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). MARCH 31, 1988 (DELAWARE) Assignors: BLOOM-1 INC.
Assigned to KIDDE INDUSTRIES, INC. reassignment KIDDE INDUSTRIES, INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). APRIL 5, 1988 DELAWARE Assignors: HKID 45 INC.
Assigned to KIDDE, INC., A DE CORP. reassignment KIDDE, INC., A DE CORP. MERGER (SEE DOCUMENT FOR DETAILS). MEMORANDUM OF DISTRIBUTION IN LIQUIDATIOIN Assignors: HIMP-2 INC., A DE CORP. (CHANGED TO), KIDDE, INC., A DE CORP. (MERGED INTO)
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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/708—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic locking devices for telescopic jibs
    • 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
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/705—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic telescoped by hydraulic jacks
    • 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
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32254—Lockable at fixed position
    • Y10T403/32467—Telescoping members
    • Y10T403/32516—Remotely actuated

Definitions

  • ABSTRACT The manual fly section of a multi-section telescopic crane boom is extended and retracted through the cooperative use of an extensible and retractable plunger on one of the boom extension cylinders and a manual locking pin insertable through registering openings of the fly section and outer mid-section of the telescopic boom.
  • the latching plunger cooperates with a notched latch bar attached to the interior of the manual fly section and the plunger is actuated manually from the exterior of the boom by a rotary screw mechanism.
  • FIG. 1 A first figure.
  • the manual fly section of a telescoping crane boom is extended and retracted by following a simple sequence of procedures which involves extensions and retractions of boom midsections by the customary power means, coordinated with manual extensions and retractions of a springurged latch plunger and a cooperating manual main locking pin.
  • the simplified operating procedure and mechanism allows extension and retraction of the manual fly section with facility and safety.
  • the latch plunger is manually operated from the exterior of the boom through registering clearance openings in the boom sections and the locking pin is manually posi tioned and disengaged relative to registering openings from the exterior of the boom.
  • the invention also utilizes strategically placed wear pads, restraining devices and adjusting means to render the operational sequence smooth and reliable.
  • Cam-like notched latch bars on the interior of the fly section automatically receive the manually extended spring-urged plunger on the cantilevered end of the extension cylinder for the boom inner mid-section. Binding of the plunger in the notched latch bar during retraction of the plunger is not detrimental to the proper operation of the plunger screw feed means and on subsequent minute movement of the boom outer mid-section during normal usage. the binding is relieved and the spring means of the plunger completes the retraction process automatically.
  • FIG. I is a fragmentary vertical section taken through a telescopic crane boom equipped with the mechanism of the invention and showing particularly the cooperative action of a latch plunger and notched latch bar.
  • FIG. 2 is a transverse vertical section taken on line 22 of FIG. 1.
  • FIG. 3 is a similar section taken on line 33 of FIG.
  • FIG. 4 is a fragmentary vertical section taken on line 4-4 of FIG. 1.
  • FIG. 6 is an enlarged central vertical section through a latching plunger, plunger housing and operating means.
  • FIG. 7 is a fragmentary plan view of the plunger taken on line 77 of FIG. 6.
  • FIG. 8 is a fragmentary horizontal section taken on line 8-8 of FIG. 6.
  • FIGS. 9, 10, 11, 12, 13, 14 and 15 are partially schematic operational sequence views showing particularly the sequence of operations during the extension of the manual fly section of the boom.
  • FIG. 16 is a fragmentary vertical section similar to FIG. 1, showing a modification of the invention.
  • FIG. 17 is a transverse vertical section similar to FIG. 2 and taken at right angles to FIG. 16.
  • FIG. 18 is a vertical section similar to FIG. 3 taken on line l818 of FIG. 16.
  • FIG. 19 is an enlarged fragmentary vertical section similar to FIG. 6, showing latch plunger drive gearing employed in the modified form of the invention.
  • the illustrated telescopic boom has a first extension cylinder or ram 24 connected at 25 to the rear of inner mid-section 20 and being cantilevered forwardly from this point.
  • The'rod of cylinder 24 is attached at 26 to base section 23.
  • a second cylinder or ram 27 beneath and parallel to the cylinder 24 has its rod end similarly attached as at 28 to the rear of outer mid-section 21 and has its rod attached at 29 to inner mid-section 20 of the telescopic boom.
  • the fragmentary parts of the two cylinders 24 and 27 appearing in FIG. 1 are their forward cantilevered ends, the rearward portions of the two cylinders being broken away in FIG. 1.
  • a foot assembly 30 for the lower cylinder 27 consists of a tubing section 31 having a rear end plate 32 bolted as at 33 to a mating plate or flange 34 on the leading end of lower cylinder 27.
  • the tubing section 31 carries a rigid welded triangular brace frame 39, provided on its lower corners with widely spaced retainers 40 for wear pads 41 which are in sliding contact with the bottom wall of manual fly section 22 near the side walls of the latter.
  • the foot assembly 30 is sufficiently long forwardly of cylinder 27 to enable wear pads 41 to remain in contact with manual fly section 22 in all adjusted positions of the latter.
  • Stabilizing and alignment means for the cantilevered end of the upper cylinder 24 relative to the lower cylinder 27 is also provided.
  • This means includes abutting plates 42 and 43 on the forward end of cylinder 24 and on a rigid welded support structure ahead of the cylinder 24 which includes longitudinal bars 44 and 45, the latter being welded to the plate 43. At their forward ends, the bars 44 and 45 carry another flange or plate 46 rigid therewith and parallel to the plate 43.
  • Interven- "ing block elements 47 are also included in the welded unit for strength, and beneath the blocks 47 a somewhat inclined plate or web 48 is welded to the blocks 47 and to the previously-described bars 44 and 45.
  • the welded structure ahead of cylinder 24 and above cylinder 27 includes a brace web 49 considerably forwardly of plate 43 and a depending apertured bracket portion 50 immediately forwardly of the plate 43 and spaced from and parallel to the web 49, see FIG.
  • the two abutting plates 42 and 43 are firmly coupled together near their tops by tension bolts 51 which extend through the blocks 47 and also through a pair of stabilizing sleeves 52 on the top portion of cylinder 24.
  • the lower corners of plates 42 and 43 are coupled by additional bolts 53.
  • the welded structure including plates 43 and 46 and bars 44 and 45 and associated elements is therefore cantilevered ahead of the upper cylinder 24 and is disposed above the foot assembly 30.
  • a pair of side wear pads 57 are placed on opposite sides of lower cylinder 27 in sliding contact therewith. These side wear pads are retained on a pair of support arms 58 whose upper extensions 59 carry interfitting apertured knuckles 60, midway between the arms 58. These apertured knuckles receive a pivot element or bolt 61 which is supported on and extends between the web 49 and bracket 50, FIG. 1. Above the pivot element 61, arm extensions 59 straddle bar 45 and are equipped with opposed adjusting set screws 62 by means of which the wear pads 57 may be individually adjusted in relation to the lower cylinder 27.
  • a latch assembly 63 forming a key element of the invention is bodily mounted on the leading end of the welded structure which includes the plate 46.
  • This assembly includes a latch housing 64 which receives upper and lower pairs of mounting bolts 65 and 66.
  • the upper bolts 65 engage through plate 46 and blocks 47 and the lower bolts 66 engage through the plate 46, FIG. 1.
  • Adjusting shims 67 for the latch assembly 63 are provided as required to locate it accurately in relation to the mounting plate 46.
  • the housing 64 has a bore 68 receiving an extensible and retractable latch plunger 69 therein.
  • the plunger is sealed in the bore 68 by a suitable fluid seal 70, the internal chamber of the housing 64 being oil-filled.
  • the interior end of the latch plunger 69 carries a stepped flange 71 adapted to engage an annular shoulder 72 formed in the housing.
  • a compression spring 73 surrounds latch plunger 69 in an enlarged bore chamber 74 of the housing and one end of this spring engages stepped flange 71 while its other end engages a shoulder 75 within the housing.
  • Spring 73 urges the latch plunger 69 inwardly or retracted relative to the housing 64.
  • the plunger 69 is restrained from rotation on its longitudinal axis by a pair of parallel plates 76 mounted on the top of housing 64, and cooperating with a pair of flats 77, FIG. 7, formed on opposite sides of the plunger.
  • the latch plunger 69 is extended and retracted manually by an internal nut 78 driven axially by a screw shaft 79 whose outward movement is limited by a head 80 on the screw shaft.
  • the latch plunger 69 is shown fully extended from the housing 64 in FIG. 6.
  • a second compression spring 81 inside of the plunger 69 is seated 4 on the nut 78 and urges the latch plunger outwardly toward its extended position.
  • the two springs 73 and '81 work in opposition in relation to the plunger 69.
  • a cover plate 84 for the lower side of housing 64 is bolted thereto at 85 with a suitable gasket 86 intervened between the covver plate and housing.
  • the screw shaft 79 has a shank 87 swiveled and sealed within an opening of the cover plate 84, and the screw shaft is turned by a drive shaft 88 coupled through a first universal joint 89 with the screw shaft 79.
  • a bracket arm 90 welded to the cover plate 84 extends downwardly and to one side of tube section 31 and terminates near the bottom of brace frame 39, FIG. 2.
  • This arm supports a sleeve 91 for a rotary shaft 92 coupled through a second universal joint 93 with the shaft 88.
  • the shaft 92 has a hex head 94 to permit turning by a manual crank wrench 95, FIGS. 9 and 14, whose use will be fully explained.
  • Wrench access openings 96 are formed in the bottom walls of boom sections 20, 21 and 22, as shown.
  • a latch bar or plate 97 is fixedly secured to the top wall of manual fly section 22, FIGS. 1 and 2.
  • This latch bar has sloping cam faces 98 on opposite sides of a centrally located receiver notch 99 for latch plunger 69.
  • outer mid-section 21 is extended by use of the lower extension cylinder 27.
  • the spring-loaded latch plunger 69 engages and rides over one of the sloping cam faces 98 and snaps into the notch 99 of the latch bar 97.
  • the inner spring 81 is compressed.
  • the plunger 69 passes over the notch 99 and is forced into the notch by spring 81.
  • the lower cylinder 27 has bottomed out.
  • the use of the shims 67 assures accuracy in the relationship of the plunger 69 to the latch bar notch 99. The arrangement is such that the notch receives the plunger 69 at the same time that the extension cylinder 27 bottoms out and the fly section 22 is fully retracted in the outer mid-section 21.
  • the manual fly section 22 is positively locked to outer mid-section 21 by a manual locking pin unit 100. If the fly section 22 happens to be extended a fraction of an inch in FIG. 11, which is possible due to the clearance provided for the locking pin 100 by the opening 101 in the fly section, the latch plunger 69 will engage the latch bar notch 99 as the latch tends to pass by the notch. The fly section 22 will be moved back into the outer mid-section 21 until it engages its stops simultaneously with the bottoming out of lower cylinder 27. This small reverse movement of fly section 22 will relieve any binding on the locking pin 100 to facilitate its manual removal. as now required in the operational sequence. The manual removal of the locking pin 100 is shown in FIG. 12, all other parts remaining in their relative positions illustrated in FIG. 11.
  • the latch wrench 95 is again utilized to turn screw shaft 79 clockwise in order to retract latch plunger 69 from the latch bar notch 99, thus unlatching the manual fly section 22 from the upper cylinder 24 on which the latch assembly 63 is bodily mounted.
  • the boom now has its manual fly section 22 fully extended and ready for normal usage.
  • the operation of the screw shaft will not immediately effect plunger retraction.
  • the screw shaft 79 will be free to turn the required amount.
  • the nut 78 moves downwardly relieving all tension in the inner spring 81.
  • the outer spring 73 being compressed, exerts a force on the plunger 69 tending to dislodge it from the notch 99. As the outer mid-section 21 is extended for normal boom usage. the binding of the plunger 69 is relieved and the outer spring 73 will immediately retract the plunger from the notch 99.
  • the latch plunger 69 is manually extended by use of the crank wrench 95 through clearance openings 96 as previously described.
  • the outer mid-section 21 is retracted as shown in FIG. 14 by operation of cylinder 27.
  • the plunger 69 is pushed back into housing 64 by cam face 98, compressing inner spring 81.
  • the plunger 69 then snaps into the notch 99.
  • the outer mid-section 21 has not yet bottomed out. and fly section 22 will be moved forwardly a fraction of an inch relieving binding on locking pin 100.
  • the locking pin 100 is the load carrying member locking the fly section 22 to outer mid-section 21 in the extended position. Binding of the locking pin will be 6 caused by the fly section of the boom sliding back against the pin when a load is being lifted by the boom and with the boom elevated.
  • the locking pin 100 is removed.
  • the outer mid-section is extended by lower cylinder 27.
  • the forward opening 101 in fly section 22 comes into registry with locking pin opening 103 in the outer mid-section 21.
  • the locking pin 100 is inserted and secured.
  • Latch plunger 69 is retracted by manually turning screw shaft 79 clockwise by means of crank wrench 95. If the latch plunger 69 binds in notch 99, the latch nut 78 will travel down the screw shaft relieving all of the spring tension which holds the plunger extended.
  • the outer spring 73 now tends to extract the plunger 69 from the notch. which it does instantly when the binding of the plunger is relieved as the outer mid-section is retracted.
  • the system can be double blocked by retracting the outer mid-section of the boom. Double blocking can also be experienced in FIG. 6.
  • the mechanism is designed to withstand inadvertent double blocking with full force on the cylinder 27 in either direction.
  • the invention contemplates that the positions of the latch assembly 63 and latch bar 97 within the boom may be reversed. so that the latch bar 97 is connected to the end of the support member or hydraulic cylinder 24 extending into the boom sections and the latch assembly 63 is mounted on the inner end of the manual fly section 22.
  • the latch bar 97 is connected to the end of the support member or hydraulic cylinder 24 extending into the boom sections and the latch assembly 63 is mounted on the inner end of the manual fly section 22.
  • one latching element is secured to the support member or cylinder 24 within the boom sections and which support member or cylinder is connected to the innermost section 20 of a three-section boom; and a cooperating latching element is mounted on the interior end portion of manual fly section 22, independent of the means connected between the boom mid-section 21 and the adjacent innermost section 20 of a three-section boom sub-assembly for extending the mid-section 21 relative to the innermost section 20.
  • the means for extending the boom mid-section may comprise other types of power means, such as a hydraulic motor chain or belt drive, or other equivalent means in lieu of the cylinder-piston arrangement shown in the drawings.
  • FIGS. 16l9 a modification of the invention is shown wherein the boom fly section 100 is equipped with a notched latch bar 101' constructed in a manner described in the prior embodiment of the invention.
  • Latch assembly 102' corresponding to the assembly 63 is bolted at 103 to a short extension support structure 104 on the forward cantilevered end of an upper cylinder 105, which is identical to the previously described cylinder 24.
  • Locator shims 106 are placed between the latch assembly 102' and the cylinder-carried support structure 104.
  • a lower cylinder 107 identical to the lower cylinder 27 has a rigid leg structure 108 bolted to its forward end. and widely-spaced wear pads 109 are carried by the two legs of structure 108 and bear slidably on the bottom wall of boom fly section 100'. as shown in FIGS. 16 and 17.
  • the present modification employs a fixed or non-adjustable side wear pad arrangement shown particularly in FIG. 18.
  • the latch assembly support structure 104 includes a bottom plate 110 having a pair ofside depending plates 111 welded thereto in straddling relationship to the lower cylinder 107.
  • Side wear pads 112 carried by the plates 111, slidably engage the opposite sides of cylinder 107.
  • This cylinder 107 is equipped at its top with a fixed inverted channel element 113 providing a flat top bearing surface for an upper wear pad 114 secured to the bottom of the plate 110.
  • the engaging flat faces of channel 113 and wear pad 114 prevent relative rotation of the wear pad structure and cylinder 105 during boom operation.
  • the latch assembly 102 is identical in construction to the assembly 63 from its top down to its cover plate 115. It employs the same housing 64 and latch plunger arrangement described in connection with FIG. 6, as well as the identical dual plunger arrangement shown in that figure.
  • a screw shaft 116 similar to the screw shaft 79, is employed for the identical purpose of extending and retracting the latch plunger 69.
  • the screw shaft 116 is journaled for rotation in a bearing 117 of cover plate 115.
  • a drive gear 118 for the screw shaft 116 is pinned to the lower end thereof below the cover plate 115 and meshes with an idler gear 119 journaled on a short shaft 120 welded to the cover plate 115.
  • This idler gear 119 meshes with an input drive gear 121 pinned to a manual drive shaft 122 journaled in a bearing means 123 on a lateral extension 124 of cover plate 115.
  • the manual drive shaft 122 is pinned at its top to a suspension or thrust bearing 125 which rotates with the shaft 122 and bears on a fixed sleeve 126 carried by cover plate extension 124.
  • the lower end of manual drive shaft 122 has a wrench-engageable head 127, such as a hex head adapted to be coupled with, and turned by, the previously described manual crank wrench 95, or an equivalent manual means.
  • a wrench-engageable head 127 such as a hex head adapted to be coupled with, and turned by, the previously described manual crank wrench 95, or an equivalent manual means.
  • a latch mechanism for a telescopic boom having at least three boom sections including a boom inner section. a boom mid-section and a manual fly section each having a hollow interior and at least one power cylinder for extending and retracting the boom mid-section.
  • a latch bar fixed to said manual fly section and movable therewith relative to said latch assembly, said latch plunger being springloaded for interlocking engagement with the latch bar when the latter is moved into contact with said plunger.
  • the plunger is selectively manually operated from the exterior of the telescopic boom to be in an operative or non-operative position with respect to said latch bar, and manual means for positively coupling said manual fly section and mid-section together for movement as a unit by said power cylinder and for allowing the power cylinder to move the mid-section relative to the manual fly section when the latter is latched and said manual means is removed.
  • a latch mechanism as defined by claim 1, wherein said support for said manual latch assembly comprises a second power cylinder for the telescopic boom having a connection with a base section thereof and an inner mid-section of the boom.
  • a latch mechanism as defined by claim 1, and said manually operated extension and retraction means for said plunger including a screw shaft, a nut drivingly connected to the screw shaft, and a compression spring interposed between the nut and latch plunger.
  • a latch mechanism as defined by claim 4 and manual drive shaft means coupled to said screw shaft and having a rotary input element adapted for turning by a manual tool from the exterior of the boom, the boom sections having alignable access openings to receive said tool.
  • a latch mechanism as defined by claim 8 and an extension structure on the leading end of said second power cylinder and coupled to and carrying said manual latch assembly.
  • a latch mechanism as defined by claim 11, and said last-named means including a pair of pivoted arms carrying the side bearing pads, and independently operable screw-threaded adjusting means for each pivoted arm.
  • a latch mechanism for a telescopic boom having at least three boom sections having an interior space including a manual fly section, a midsection and an innermost section, and power means for extending and retracting said mid-section, comprising a support member mounted on the boom innermost section projecting forwardly into the interior space of said midsection and into the interior space of said manual fly section telescoped in the midsection, a pair of cooperating latch components mounted one each on the support member and on the manual fly section for relative movement, said cooperating latch components adapted to engage and interlock in one relative position of the manual fly section to the innermost section when moved together in response to operation of said power means, and manual means for positively coupling said manual fly section and the mid-section together for movement as a unit by said power means and for allowing the power means to move the mid-section relative to the manual fly section when the latter is latched and said manual means is removed, and one of said cooperation manual latch components being manually and mechanically adjustable by a mechanical implement directly hand operable from the boom exterior between an operative or a non-operative
  • a latch mechanism as defined by claim 16, and said gearing comprising a screw shaft having a connection with the latch plunger. spur gearing coupled with the screw shaft to drive it, and a manual drive shaft connected with the spur gearing and having a coupling head adapted to be engaged by a manual crank wrench for turning.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Jib Cranes (AREA)
US492265A 1974-07-26 1974-07-26 Boom latch mechanism Expired - Lifetime US3921819A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
US492265A US3921819A (en) 1974-07-26 1974-07-26 Boom latch mechanism
ZA00753335A ZA753335B (en) 1974-07-26 1975-05-23 Boom latch mechanism.
AU81473/75A AU489141B2 (en) 1974-07-26 1975-05-23 Boom latch mechanism
ES438294A ES438294A1 (es) 1974-07-26 1975-06-06 Perfeccionamiento en mecanismos retenedores para un aguillontelescopico de grua.
NLAANVRAGE7507319,A NL179803C (nl) 1974-07-26 1975-06-19 Vergrendelingsmechanisme voor een telescopische giek.
JP1975083695U JPS5624710Y2 (it) 1974-07-26 1975-06-20
DE2528129A DE2528129C2 (de) 1974-07-26 1975-06-24 Teleskopausleger
GB26830/75A GB1500580A (en) 1974-07-26 1975-06-24 Telescopic boom
FR7520044A FR2279656A1 (fr) 1974-07-26 1975-06-26 Mecanisme de verrouillage pour une fleche telescopique de grue
CA230,280A CA1023307A (en) 1974-07-26 1975-06-26 Boom latch mechanism
BE157810A BE830788A (fr) 1974-07-26 1975-06-27 Mecanisme de verrouillage pour une fleche telescopique de grue
IT12691/75A IT1033913B (it) 1974-07-26 1975-07-08 Gru telescopica
PL1975182159A PL117432B1 (en) 1974-07-26 1975-07-18 Locking mechanism for telescopic outriggers
BR7504763*A BR7504763A (pt) 1974-07-26 1975-07-25 Aperfeicoamento em mecanismo de travamento para uma lanca telescopica

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US492265A US3921819A (en) 1974-07-26 1974-07-26 Boom latch mechanism

Publications (1)

Publication Number Publication Date
US3921819A true US3921819A (en) 1975-11-25

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ID=23955611

Family Applications (1)

Application Number Title Priority Date Filing Date
US492265A Expired - Lifetime US3921819A (en) 1974-07-26 1974-07-26 Boom latch mechanism

Country Status (13)

Country Link
US (1) US3921819A (it)
JP (1) JPS5624710Y2 (it)
BE (1) BE830788A (it)
BR (1) BR7504763A (it)
CA (1) CA1023307A (it)
DE (1) DE2528129C2 (it)
ES (1) ES438294A1 (it)
FR (1) FR2279656A1 (it)
GB (1) GB1500580A (it)
IT (1) IT1033913B (it)
NL (1) NL179803C (it)
PL (1) PL117432B1 (it)
ZA (1) ZA753335B (it)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4350255A (en) * 1979-06-29 1982-09-21 Harnischfeger Gmbh Telescoping mobile crane
WO1983001611A1 (en) * 1981-11-04 1983-05-11 Mentzer, William, R. Remotely operable latch and locking pin for a multi-section boom including a manual fly section
US4492311A (en) * 1981-08-17 1985-01-08 Fmc Corporation Coupling and latching mechanism for extensible boom
US4514939A (en) * 1981-08-17 1985-05-07 Fmc Corporation Extensible boom with manual section stored in base
US4585132A (en) * 1984-09-10 1986-04-29 Fmc Corporation Extensible boom with manual section stored in base
US4592474A (en) * 1981-08-17 1986-06-03 Fmc Corporation Coupling and latching mechanism for extensible boom
US4635805A (en) * 1981-11-05 1987-01-13 Kidde, Inc. Crane boom locking pin insertion indicator and actuator means
US4664272A (en) * 1981-11-05 1987-05-12 Kidde, Inc. Telescoping crane boom with locking and indicator means
FR2595343A1 (fr) * 1986-03-07 1987-09-11 Harnischfeger Corp Procede et appareil pour sortir la volee d'une fleche de grue
US5609261A (en) * 1995-09-19 1997-03-11 Hydra Tech, Inc. Pivotable boom rest and latch
US6164468A (en) * 1998-06-17 2000-12-26 Grove U.S. L.L.C. Jib positioning with hydraulic adjustment cylinder
US6520359B2 (en) * 2000-05-08 2003-02-18 Grove U.S. Llc Lateral boom locking and actuating unit
US6575318B2 (en) * 2000-09-21 2003-06-10 Atecs Mannesmann Ag Locking unit for a telescopic jib of a crane and telescopic jib
US20070222253A1 (en) * 2006-03-21 2007-09-27 Wood Robert A Jr Covering device for a vehicle container
US20100213154A1 (en) * 2009-02-20 2010-08-26 Terex Demag Gmbh Locking and bolting unit
US20110049077A1 (en) * 2007-10-31 2011-03-03 Terex-Demag Gmbh Crane with Telescopic Boom
CN103016742A (zh) * 2013-01-04 2013-04-03 四川日机密封件股份有限公司 耐高压机械密封装置
CN103738864A (zh) * 2013-12-19 2014-04-23 三一汽车起重机械有限公司 起重臂和起重机
US11117789B2 (en) * 2018-06-04 2021-09-14 Manitowoc Crane Companies, Llc Telescoping boom with rotary extension and locking system
US20220169485A1 (en) * 2019-04-04 2022-06-02 Tadano Ltd. Work machine

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US4396126A (en) * 1980-11-24 1983-08-02 Harnischfeger Corporation Telescoping crane boom
FR2523565B1 (fr) * 1982-03-19 1985-12-06 Ppm Sa Fleche telescopique munie d'une allonge
DE19631547B4 (de) * 1996-07-24 2004-05-06 Terex-Demag Gmbh & Co. Kg Teleskopausleger, insbesondere für stationäre oder fahrbare Krane
DE19811813B4 (de) * 1998-03-18 2005-11-24 Grove U.S. LLC (n.d.Ges.d.Staates Delaware) Seitliche Auslegerverriegelung
JP2023066029A (ja) * 2021-10-28 2023-05-15 株式会社タダノ 作業機

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US3243052A (en) * 1965-04-08 1966-03-29 Grove Mfg Co Telescopic crane boom with longitudinally extending cylinder connector
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus
US3474833A (en) * 1966-08-26 1969-10-28 Armed Forces Equipment Dev Cor Telescoping tube assembly
US3842985A (en) * 1972-12-15 1974-10-22 Harnischfeger Corp Means for extending and retracting crane boom section

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US3243052A (en) * 1965-04-08 1966-03-29 Grove Mfg Co Telescopic crane boom with longitudinally extending cylinder connector
US3474833A (en) * 1966-08-26 1969-10-28 Armed Forces Equipment Dev Cor Telescoping tube assembly
US3398645A (en) * 1966-11-30 1968-08-27 Nat Crane Corp Multiple extension apparatus
US3842985A (en) * 1972-12-15 1974-10-22 Harnischfeger Corp Means for extending and retracting crane boom section

Cited By (27)

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Publication number Priority date Publication date Assignee Title
US4350255A (en) * 1979-06-29 1982-09-21 Harnischfeger Gmbh Telescoping mobile crane
US4492311A (en) * 1981-08-17 1985-01-08 Fmc Corporation Coupling and latching mechanism for extensible boom
US4514939A (en) * 1981-08-17 1985-05-07 Fmc Corporation Extensible boom with manual section stored in base
US4592474A (en) * 1981-08-17 1986-06-03 Fmc Corporation Coupling and latching mechanism for extensible boom
WO1983001611A1 (en) * 1981-11-04 1983-05-11 Mentzer, William, R. Remotely operable latch and locking pin for a multi-section boom including a manual fly section
US4490951A (en) * 1981-11-04 1985-01-01 Kidde, Inc. Remotely operable latch and locking pin for a multi-section boom including a manual fly section
US4635805A (en) * 1981-11-05 1987-01-13 Kidde, Inc. Crane boom locking pin insertion indicator and actuator means
US4664272A (en) * 1981-11-05 1987-05-12 Kidde, Inc. Telescoping crane boom with locking and indicator means
US4585132A (en) * 1984-09-10 1986-04-29 Fmc Corporation Extensible boom with manual section stored in base
FR2595343A1 (fr) * 1986-03-07 1987-09-11 Harnischfeger Corp Procede et appareil pour sortir la volee d'une fleche de grue
US5609261A (en) * 1995-09-19 1997-03-11 Hydra Tech, Inc. Pivotable boom rest and latch
US6164468A (en) * 1998-06-17 2000-12-26 Grove U.S. L.L.C. Jib positioning with hydraulic adjustment cylinder
US6520359B2 (en) * 2000-05-08 2003-02-18 Grove U.S. Llc Lateral boom locking and actuating unit
US6575318B2 (en) * 2000-09-21 2003-06-10 Atecs Mannesmann Ag Locking unit for a telescopic jib of a crane and telescopic jib
US20070222253A1 (en) * 2006-03-21 2007-09-27 Wood Robert A Jr Covering device for a vehicle container
US7370904B2 (en) * 2006-03-21 2008-05-13 Mcneilus Truck And Manufacturing, Inc. Covering device for a vehicle container
US8215503B2 (en) * 2007-10-31 2012-07-10 Terex-Demag Gmbh Crane with telescopic boom
US20110049077A1 (en) * 2007-10-31 2011-03-03 Terex-Demag Gmbh Crane with Telescopic Boom
US9090438B2 (en) * 2009-02-20 2015-07-28 Terex Cranes Germany Gmbh Locking and bolting unit
US20100213154A1 (en) * 2009-02-20 2010-08-26 Terex Demag Gmbh Locking and bolting unit
CN103016742A (zh) * 2013-01-04 2013-04-03 四川日机密封件股份有限公司 耐高压机械密封装置
CN103016742B (zh) * 2013-01-04 2015-04-22 四川日机密封件股份有限公司 耐高压机械密封装置
CN103738864A (zh) * 2013-12-19 2014-04-23 三一汽车起重机械有限公司 起重臂和起重机
CN103738864B (zh) * 2013-12-19 2016-01-20 三一汽车起重机械有限公司 起重臂和起重机
US11117789B2 (en) * 2018-06-04 2021-09-14 Manitowoc Crane Companies, Llc Telescoping boom with rotary extension and locking system
US20220169485A1 (en) * 2019-04-04 2022-06-02 Tadano Ltd. Work machine
US11958726B2 (en) * 2019-04-04 2024-04-16 Tadano Ltd. Work machine

Also Published As

Publication number Publication date
NL7507319A (nl) 1976-01-28
BR7504763A (pt) 1976-07-06
CA1023307A (en) 1977-12-27
JPS5624710Y2 (it) 1981-06-10
ES438294A1 (es) 1977-02-01
IT1033913B (it) 1979-08-10
JPS5117972U (it) 1976-02-09
DE2528129C2 (de) 1986-10-30
PL117432B1 (en) 1981-08-31
ZA753335B (en) 1976-04-28
BE830788A (fr) 1975-12-29
FR2279656A1 (fr) 1976-02-20
NL179803C (nl) 1986-11-17
DE2528129A1 (de) 1976-02-05
GB1500580A (en) 1978-02-08
AU8147375A (en) 1976-11-25
FR2279656B1 (it) 1980-04-18
NL179803B (nl) 1986-06-16

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