WO2008130360A1 - Ensemble de verrouillage pour fixer un élément d'usure à un équipement de terrassement - Google Patents

Ensemble de verrouillage pour fixer un élément d'usure à un équipement de terrassement Download PDF

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Publication number
WO2008130360A1
WO2008130360A1 PCT/US2007/010104 US2007010104W WO2008130360A1 WO 2008130360 A1 WO2008130360 A1 WO 2008130360A1 US 2007010104 W US2007010104 W US 2007010104W WO 2008130360 A1 WO2008130360 A1 WO 2008130360A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking element
base
locking
accordance
assembly
Prior art date
Application number
PCT/US2007/010104
Other languages
English (en)
Inventor
Terry L. Briscoe
Aaron B. Lian
Christopher M. Carpenter
Original Assignee
Esco Corporation
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 Esco Corporation filed Critical Esco Corporation
Priority to PCT/US2007/010104 priority Critical patent/WO2008130360A1/fr
Publication of WO2008130360A1 publication Critical patent/WO2008130360A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/28—Small metalwork for digging elements, e.g. teeth scraper bits
    • E02F9/2808—Teeth
    • E02F9/2816—Mountings therefor
    • E02F9/2833—Retaining means, e.g. pins
    • E02F9/2841—Retaining means, e.g. pins resilient

Definitions

  • the present invention pertains to a lock assembly for securing a wear member to earth-working equipment.
  • Wear parts are commonly attached to all kinds of earth-working equipment to prolong the useful life of the equipment. For example, teeth are mounted along the digging edge of various kinds of excavating equipment, runners are mounted along buckets and chutes, hammers are mounted in crushers, etc.
  • Such wear parts typically comprise multiple components such as a base fixed to the equipment, a wear member mounted over the base, and a lock to releasably hold the wear member to the base. In this way, the material to be discarded due to wear can be minimized.
  • the present invention pertains to an improved lock assembly for securing wear members to earth-working equipment, which is hammerless, easy to use, readily manufactured, strong, stable, and able to reduce the problems associated with impacted fines.
  • the lock assembly includes a locking element which turns about an axis between a retaining position and a release position.
  • the locking element is coupled to a base structure such that its outer edge swings into space previously occupied by the locking element when turned to its release position. In this way, the resistance of impacted fines is alleviated.
  • the lock then, is easy to use and manipulate for those in the field when the wear members need replacing.
  • the locking element includes a cavity for receiving a tool by which a user can release a keeper, turn the locking element to the release position, and/or remove the lock from the wear assembly.
  • the lock is operable between release and hold positions without the nded for a hammer for increased safety and ease of use.
  • Figure 1 is a partial side view of a wear assembly with a lock in accordance with the present invention.
  • Figure 2 is a partial side view of the lock with the locking element in locked position.
  • Figure 3 is a partial side view of the lock with the locking element in the release position.
  • Figure 4 is a partial side view of the wear assembly with a removal tool.
  • Figure 5 is a partial side view of the wear assembly with the removal tool moving the locking element to the release position.
  • Figure 6 is a partial side view of a second embodiment of the lock.
  • Figure 7 is a partial perspective view of a wear assembly with a third embodiment of a lock in accordance with the present invention.
  • Figure 8 is a partial perspective view of the wear assembly of Figure 7 with the lock in the release position.
  • Figure 9 is a cross-sectional view taken along line 9-9 in Figure 7.
  • Figure 10 is a perspective view of the nose and lock of the wear assembly of Figure 7.
  • Figure 11 is a perspective view of the lock in Figure 7.
  • Figure 12 is a side view of a nose of a fourth embodiment of the invention.
  • Figure 13 is a perspective view of the nose and a lock (with the keeper omitted) in accordance with the fourth embodiment of the invention.
  • Figure 14 is a perspective view of the lock of the fourth embodiment of the invention.
  • Figure 15 is a cross-sectional view of the wear assembly of the fourth embodiment taken generally along line 15-15 in Figure 12.
  • Figure 16 is a cross-sectional view of the wear assembly of the fourth embodiment taken generally along line 16-16 in Figure 12.
  • Figure 17 is a schematic cross-sectional view of a lock arrangement received into an assembly in the locked condition.
  • Figure 18 is a schematic cross-sectional view of the lock arrangement of Figure 17 received into an assembly in the release condition.
  • Figure 19 is a schematic top view of the lock arrangement of Figure 17 in the locked condition.
  • Figure 20 is a schematic top view of the lock arrangement of Figure 17 in the release condition.
  • the present invention pertains to a lock assembly for releasably attaching a wear member to earth-working equipment such as excavating buckets, dredge cutters, ore chutes, crushers or the like.
  • earth-working equipment such as excavating buckets, dredge cutters, ore chutes, crushers or the like.
  • the invention is described in the context of securing a point to a nose to form an excavating tooth for a bucket.
  • lock assemblies in accordance with the present invention can secure a wide array of wear members (e.g., shrouds, wear caps, runners, hammers, etc.) which are attached to virtually all kinds of earth- working equipment.
  • relative terms such as forward, rearward, up or down are used for convenience of explanation with reference to Figure 1; other orientations are possible.
  • Wear assembly 10 is shown as an excavating tooth with a nose 12, a wear member or point 14, and a lock 16 to releasably hold the point to the nose (Figs. 1-5).
  • Nose 12 may be cast as part of the lip or may be part of an adapter fixed to the lip by welding or mechanical attachment.
  • the illustrated nose and point are formed as described in US Patent No. 6,993,861, hereby incorporated by reference, with a tapered cavity 18 for receiving the lock.
  • Point 14 includes a side ear 20 with an inward lug (not shown) to define an opening 15. When the components are assembled together, opening 15 cooperates with an opening 17 defined as a side relief in nose 12 to collectively define a cavity 18 for receiving lock 16.
  • Lock 16 includes a body 22 having a tapered width and/or thickness for mating receipt into passage 18 (Figs. 2 and 3). As described in US Patent No. 6,993,861, this tapering of the body enables the lock to be pried into and out of the cavity without the use of a hammer. While a hammerless operation is preferred, the inventive concepts could be used in a lock having a body that does not taper and/or a lock that requires hammering.
  • Lock 16 also includes a rotating locking element 24 in the form of a latch received in a cavity 25 formed in body 22.
  • locking element 24 is secured to body 22 via shaft 26 received in hole 28 for turning about axis 29. The locking element, then, turns about shaft 26 between the retaining position (Fig. 2) and the release position (Fig. 3).
  • a finger 34 of the locking element extends to project beyond body 22 in the retaining position so as to engage a stop 36 formed in point 14 (or nose 12) and thereby hold the lock in cavity 18.
  • a curved outer edge 30 of locking element 24 (i.e., the side opposite the axis of rotation defined by shaft 26 extending from top wall 39 to leading end 31) sets within a channel 35 and against seat 32 in the locked condition.
  • Channel 35 is defined by an upstanding flange 37 on body 22.
  • channel 35 and locking element 24 are tapered such that they diverge in a direction generally toward pivot axis 64. As a result, the sides of the locking element and channel do not engage until locking element is fully seated to ease turning of the locking element.
  • Locking element 24 preferably includes a keeper 38 for releasably securing the locking element in the locked and/or release positions.
  • Keeper 38 preferably includes a rigid contact element 40 formed of steel or other hard material, and a resilient biasing member 42 composed of rubber, foam or other resilient material.
  • Biasing member 42 could also be a metallic spring 42a such as shown in Figure 6.
  • Keeper 38 sets within a closed slot 44 in locking element 24 bounded by braces 45 for linear movement between an extended position and a retracted position. As shown in Figure 2, biasing member 42 ordinarily presses contact element 40 rearward and into a first index opening 46 formed in body 22. In this position, keeper 38 prevents the locking element from turning and holds finger 34 against stop 36.
  • Keeper 38 can, however, be shifted forward to release index opening 46 and permit turning of the locking element to the release position (Fig. 3).
  • the keeper may engage a second index opening 48 to secure the locking element in the release position (i.e., with finger 34 retracted) or simply remain unengaged with a locking structure in the release position.
  • locking element 24 is preferably held by keeper 38 in second index opening 48 in the release position for shipping and installation of the lock.
  • locking element 24 includes a tool cavity
  • Tool cavity 52 for receiving the end of a pry tool 54 to effect release of keeper 38 and turning of the locking element.
  • Tool cavity 52 preferably has narrowing sidewalls 56 that terminate in a generally circular end 58, but could have other shapes.
  • Tool cavity 52 is generally aligned with a notch 60 in the contact element 40 of keeper 38.
  • tool 54 is inserted into tool cavity 52 such that it passes through notch 60 (Fig. 4).
  • the tool is swung (Fig. 5) so that it presses against a sidewall 62 of notch 60 and moves contact element 40 against the bias of resilient member 42 until keeper 38 is removed from index opening 46.
  • Continued swinging of tool 54 then pries lock 16 from cavity 18 at least until it is loosely contained in cavity 18.
  • outer edge 30 is not defined by a radius of curvature originating at the shaft. Rather, outer edge 30 is defined by a radius of curvature originating from an origination point 64 that is offset from the axis of rotation 29 defined by shaft 26 so that outer edge 30 pulls away from seat 32 when it rotates to its release position. Of course, other shapes besides a radius could define the outer edge. As illustrated in Figure 2, origination point 64 is offset rearward and upward relative to axis 29 of shaft 26. As discussed above, it is common for earthen fines to become impacted in all spaces in and around the lock during use.
  • outer edge 30 were defined to generally follow the swinging of the component (i.e., be defined by a radius of curvature originating from axis 29), impacted earthen fines between the two walls 30, 32 would hinder turning of locking element 24 and the removal of lock 16.
  • the impacted fines become hard and make turning of locking element 24 difficult if outer edge 30 follows seat 32 during turning of the locking element.
  • outer edge 30 By designing outer edge 30 to memel away from seat 32, the outer edge is pulled into open space previously occupied by the locking element itself and free of earthen fines. Hence, the problem of impacted fines is alleviated once initial release of the locking element is accomplished.
  • outer edge 30 of locking element 24 preferably sets against seat 32 in the locked condition for support. Nevertheless, the problem of impacted fines remains, even if a gap exists between the outer edge and the seat in the locked condition; i.e., if a gap exists between the locking element 24 and the base structure 22, earthen fines will tend to fill the gap. Hence, irrespective of whether the seat abuts outer edge 30, it is beneficial for the outer edge to swing into space previously occupied by the locking element itself.
  • the pry tool can again be inserted into tool cavity 52 and swung in the opposite direction to pry the lock into its fully seated position where keeper 32 engages first indexing opening 46.
  • wear assembly 80 includes a nose 82, a wear member 84, and a locking element 86 in the form of a lock for the wear assembly.
  • This tooth is formed as described in Provisional Patent Application No- 60/787,268, which is hereby incorporated by reference, but could have other constructions as well.
  • Point 84 includes an opening 85 in the form of a through-hole that generally aligns with an opening 87 in nose 82 defined as a trough to define a cavity 89 for receiving locking element 86.
  • Locking element 86 includes a keeper 90 that is similar in construction and operation to keeper 38.
  • Locking element 86 includes a pair of lateral shafts 92 about which the locking element turns between its locked and release positions. Opening 85 includes a pair of arcuate channels 112 in opposing walls 114 for receiving shafts 92.
  • locking element 86 is inserted into opening 85 such that shafts 92 are moved to the closed end of channels 112. In this position, locking element 86 can be swung about shafts 92 between the release position (Fig. 8) and the locked position (Fig. 7). In the locked position, locking element 86 projects into trough 87 to prevent removal of point 84 from nose 82. Keeper 90 is biased to engage stop 100 and hold the locking element in place.
  • Keeper 90 includes a contact element 94 formed of steel or other hard material and a resilient biasing member 96 to normally bias contact element out of locking element 86.
  • Contact element 94 is formed to engage a stop 100 formed in point 84 (or nose 82) in the locked position so as to retain locking element 86 in assembly 80.
  • a tool cavity 102 is formed in locking element 86 to receive a pry tool 54 to release keeper 90 and turn locking element 86 to its release position.
  • contact element 94 is formed with a notch 104 generally aligned with cavity 102.
  • Locking element 86 includes a curved outer edge 116 that extends from a trailing end 119 at top wall 121 to leading end 123. In the hold position, outer edge 116 sets against a seat 118 collectively defined by the base 120 of trough 87 and a sidewall 122 of through-hole 85.
  • pry tool 54 is inserted into cavity 102 and notch 104 and swung to shift contact element 94 against the bias of resilient member 96 to release stop 100.
  • locking element 86 preferably has a tapered construction such that the front and rear walls 129, 131 diverge generally from outer edge 116 toward shafts 92.
  • the front and rear walls 125, 127 of trough 87 also has a complementary tapering so that front and rear walls 129, 131 of locking element 86 are spaced from front and rear walls 125, 127 of trough 87 until the locking element is fully set against seat 118.
  • Figures 12-16 illustrate an alternative embodiment that is similar to the embodiment of Figures 7-11.
  • Tooth 150 has a nose 152 and point 154 which also has a construction generally as described in US Patent Application 60/787,268, although other tooth constructions could be used.
  • a locking element 156 is received in a cavity 158 collectively defined by a through-hole 160 in point 154 and a trough 162 in nose 152. Also, as with locking element 86, locking element 156 operates to hold point 154 to nose 152. However, locking element 156 does not include pivot shafts for controlling the movement of the locking element between its locking and release positions.
  • Locking element 156 includes a top wall 165, front wall 167, rear wall
  • Outer edge 168 extends from a trailing end 190 at top wall 192 to leading end 174 and sets against seat 170 defined by the base surface 172 of trough 162 and a side 173 of through-hole 160 in the hold position (Figs. 15 and 16).
  • the rounded outer edge terminates at a leading end 174.
  • a base wall 175 extends between outer edge 168 and top wall 165, and defines a fulcrum 177 about which locking element 156 turns between the locked condition (Figs. 15 and 16) and a release position (not shown).
  • locking element 156 preferably includes a shoulder 176 that overlies nose 152 forward of trough 162 for support and stability, and to resist twisting, when in the locked condition. Shoulder 176 also substantially lengthens the bearing portion of front wall 167 that contacts nose 152 to better resist the loads applied to point 154 (Fig. 15). Of course, other means of stabilizing the locking element could be used.
  • Front and rear walls 167, 169 of locking element 156 preferably diverge slightly as they extend radially from top wall 165 to outer edge 168.
  • front and rear walls 179, 181 of trough 162 have a complementary construction such that the opening 184 of trough 162 is slightly narrower (i.e., axially) than base surface 172. In this way, trough 162 forms a channel or path through which locking element 156 moves as it turns about fulcrum 177.
  • Trough walls 179, 181 also function to hold locking element 156 during use and prevent its ejection out of cavity 158.
  • a keeper 166 engages a stop 183 formed in through-hole 160
  • Keeper 166 includes a contact element 182 formed of steel or other hard material and a resilient biasing member 185 to normally bias contact element 182 outward for engagement with the stop (Figs. 14-16).
  • a tool cavity 186 is formed in locking element 156 to receive a pry tool 54 to release keeper 166 and turn locking element 156 to its release position.
  • contact element 182 is formed with a notch 187 generally aligned with tool cavity 186.
  • the pry tool 54 can be inserted into tool cavity 186 and notch 187 in contact element 182, and swung to release keeper 166 from stop 183, and then, turn locking element 156 about fulcrum 177 to place locking element 156 in its release condition (i.e., where locking element 156 is removable from cavity 158).
  • FIGS 17-20 are schematic illustrations of the locking concepts in accordance with the present invention in a generic environment (i.e., the concepts of the invention are usable in connecting virtually any wear member in an earth-working environment to its base), but do not illustrate an actual locking assembly.
  • Locking element 130 includes an outer edge 134 that sets against seat 136 in the locked condition.
  • the outer edge 134 is shaped to pull away from seat 136 when the locking element is rotated to its release condition. While the outer edge is preferably defined as a circular arc having a radius of curvature with an origination point offset from the axis of rotation, it could have a different, non-circular shape so long as it moves into space previously occupied by the locking element when the locking element is moved to its release position.
  • locking element 130 is also tapered along its outer edge 134 in generally the same manner as discussed above with locking elements 24, 86, 156. That is, locking element narrows along outer edge 131 as it extends from its outer corner 133 to its opposing inner corner 135 (Fig. 17). Likewise, the sides 137, 139 of the cavity 141 have a complementary narrowing. With this additional tapering, the outer edge of the locking element is free of contact with the seat and impacted earthen fines in essentially all directions after initial movement from its locked position. As a result, release of the locking element is made easier.
  • the concepts of the present invention are beneficial to virtually any lock which uses a rotating locking element to secure a wear member to earth-working equipment where earthen fines may present a problem to removal of the lock.

Abstract

L'invention concerne un élément de verrouillage pour retenir un élément d'usure sur un équipement d'excavation, lequel ensemble de verrouillage a un élément de verrouillage qui est reçu dans une ouverture dans l'ensemble et est mobile autour d'un axe de pivotement dans l'ouverture entre une position de maintien et une position de libération. L'élément de verrouillage a un bord externe qui est généralement opposé à l'axe de pivotement qui s'oppose à une surface de base de l'ouverture lorsque l'élément de verrouillage se situe dans la position de maintien. Le bord externe est configuré pour tirer à l'opposé de la surface de base lorsque l'élément de verrouillage est amené à tourner de la position de maintien vers la position de libération.
PCT/US2007/010104 2007-04-24 2007-04-24 Ensemble de verrouillage pour fixer un élément d'usure à un équipement de terrassement WO2008130360A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2007/010104 WO2008130360A1 (fr) 2007-04-24 2007-04-24 Ensemble de verrouillage pour fixer un élément d'usure à un équipement de terrassement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2007/010104 WO2008130360A1 (fr) 2007-04-24 2007-04-24 Ensemble de verrouillage pour fixer un élément d'usure à un équipement de terrassement

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WO2008130360A1 true WO2008130360A1 (fr) 2008-10-30

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244047A (en) * 1991-08-05 1993-09-14 Arthur H. Groover Apparatus for coupling implements to a farm tractor
US6993861B2 (en) * 2001-07-06 2006-02-07 Esco Corporation Coupling for excavating wear part

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5244047A (en) * 1991-08-05 1993-09-14 Arthur H. Groover Apparatus for coupling implements to a farm tractor
US6993861B2 (en) * 2001-07-06 2006-02-07 Esco Corporation Coupling for excavating wear part

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