GB2433245A - Coupler jaw for an excavator - Google Patents
Coupler jaw for an excavator Download PDFInfo
- Publication number
- GB2433245A GB2433245A GB0525379A GB0525379A GB2433245A GB 2433245 A GB2433245 A GB 2433245A GB 0525379 A GB0525379 A GB 0525379A GB 0525379 A GB0525379 A GB 0525379A GB 2433245 A GB2433245 A GB 2433245A
- Authority
- GB
- United Kingdom
- Prior art keywords
- jaw
- coupler
- pin
- lip
- attachment
- 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.)
- Granted
Links
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- 239000007787 solid Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims description 2
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- FNEXNZUHBCBQTI-UHFFFAOYSA-N butyl 2-(2,4,5-trichlorophenoxy)acetate Chemical compound CCCCOC(=O)COC1=CC(Cl)=C(Cl)C=C1Cl FNEXNZUHBCBQTI-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/3604—Devices to connect tools to arms, booms or the like
- E02F3/3609—Devices to connect tools to arms, booms or the like of the quick acting type, e.g. controlled from the operator seat
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/3604—Devices to connect tools to arms, booms or the like
- E02F3/3686—Devices to connect tools to arms, booms or the like using adapters, i.e. additional element to mount between the coupler and the tool
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Component Parts Of Construction Machinery (AREA)
Abstract
An excavator coupler (14) that is either attached to, or for attachment to, an excavator arm (12) of a digger (10) for connecting an attachment, such as a bucket (16), to the excavator arm (12) of the digger (10), the attachment having at least one bucket (or coupler) pin (32), wherein the coupler (14) comprises a jaw (30) for engaging that pin (32), the jaw (30) comprising an interior space (44) for the pin (32), and lips (38, 40) that partially occlude the interior space (44) so as to provide a profile for the jaw (30) that has a widened interior relative to either the gap between the lips (38, 40) or the opening of the jaw (30), if narrower, one lip (38) being provided on an upper wall (46) of the jaw (30) and the other lip (40) being provided on a lower wall (48) of the jaw (30).
Description
<p>Coupler with Improved Jaw Configuration The present invention relates
to a jaw of a coupler fbr coupling attachments, such as buckets, to the excavator arm of a digger.</p>
<p>Attachments used to be, and still sometimes are, attached directly to the excavator arm of diggers by using bucket (or coupler) pins, hereinafter called "pins". They extend through holes both in the end of the excavator arm and in the attachments. The pins link them together such that they are relatively pivotable by manipulation of the arm. 1 0</p>
<p>The insertion of those pins through the holes has always proved to he difficult or inconvenient, especially in view of the heavy weight of some attachments. This is made worse by the fact that all of the holes need to he carefully aligned in order fbr the pins to be passed through them. To avoid this problem, therefore, automated or "quick" couplers I 5 have been developed. They enable the operator of the digger to couple the attachment to the excavator arm from within the cab of the digger -the coupler is already attached to the arm, usually by two more pins.</p>
<p>Some quick couplers also allow that coupling to be secured, i.e. made safe from accidental disengagement. See, for example, the couplers disclosed in GB2330570 (to Miller UK), GB2359062 (to Miller UK), EPI3 18242 (to Geith), GB2332417 (to Redrock Engineering) and US6699001 (to JRB), all of which have such a safety feature.</p>
<p>GB2330570 discloses a coupler in which, in addition to the two holes for coupling the coupler to the excavator arm, there are two jaws for fitting onto the bucket pins. One of the jaws is forward facing (for engaging a first pin of an attachment). The other jaw is downwardly facing (for dipping down onto a second pin of the attachment once the first pin is in the forward facing jaw). A pivoting latching hook is associated with the downwardly facing jaw. It is for latching the second pin in that downwardly facing jaw. A blocking bar can then swing into a position behind the hook to block the hook -the blocking bar prevents the hook from pivoting backwards (i.e. out of its latched position).</p>
<p>The coupler disclosed in US6699001 also uses a blocking bar. However, in place of the pivoting latching hook, a sliding plate is provided.</p>
<p>GB2359062 also discloses a coupler having a blocking means. However, the blocking means in that coupler is instead in the form of a manual safety pin that is inserted behind the latching hook by the operator, or his assistant, through the sidewalls of the coupler.</p>
<p>The couplers in GB2332417 and EP13 18242 instead have a latch fhr each jaw. The latches are linked together such that either one or the other of the latches will remain in a latched position while the coupler is in use.</p>
<p>Despite the provision of safety features, an operator might still use the coupler incorrectly.</p>
<p>Therefore it would he desirable to provide an integral or automatic safety feature fi,r the couplers whereby the likelihood of an accidental disengagement of an attachment from the coupler can be further reduced, even where the coupler is used incorrectly.</p>
<p>The present invention therefbre provides an excavator coupler having a top either that is attached to, or that is tbr attachment to, an excavator arm of a digger, the coupler having a bottom to which an attachment, such as a bucket, can be, or is, connected, the attachment having at least one pin, wherein the coupler comprises a front jaw for engaging that pin, the jaw having an opening for the pin, the opening thcing generally longitudinally relative to the length of the coupler and the jaw comprising an interior space, and lips that partially occlude the interior space so as to provide a profile for the jaw that has a widened interior relative either to the gap between the lips or to the opening of the jaw, if narrower, and wherein one lip is provided on an upper wall of the jaw and the other lip is provided on a lower wall of the jaw.</p>
<p>Preferably the jaw's interior space has an intermediate portion behind the lips that is widened relative to the gap between the lips and also widened relative to a back portion of the interior space.</p>
<p>Preferably the back portion defines a seat for the pin. The pin can then sit in that seat when the attachment is secured properly to the coupler.</p>
<p>Preferably the hack portion of the jaw is generally circular or radiused, i.e., defining a semi-tubular prolile. That feature provides a seat for a round bucket pin of an appropriate size (which will he fractionally smaller than the radius of the back portion), whereby the pin can sit firmly or securely within the hack portion of the jaw.</p>
<p>The radiused portion may comprise a curve with more than one radius whereby two or more differently sized round pins can sit firmly or securely within the back portion of the jaw. The two or more radiused curves may be distinctly formed or might instead be blended together.</p>
<p>Preferably the coupler is provided with another jaw which is downwardly thcing, i.e. away from the excavator arm, in use. It is for receiving a second pin of the attachment.</p>
<p>Preferably the downwardly facing jaw has a latching hook or a latching plate associated with it. The hook or plate is for locking the second pin within the downwardly facing jaw upon movement or advancement of that latching hook or plate into a latched position.</p>
<p>Preferably the front jaw is a solid member that extends across the full width of the coupler, and preferably with a substantially constant cross section. However, it may be a bifurcated jaw, e.g. by being formed by cutting or fOrming the jaw's profile into two side plates of the coupler. Additionally or alternatively, it might have a taper, usually Ofl its bottom ha1f e.g. to form (or partially fOrm) a beak or a point. The taper can ease or facilitate the engagement of thejaw with the first pin.</p>
<p>If the coupler is made of a cast body, preferably milling provides some of the finished surfaces of the coupler. The jaws may be fOrmed or finished by that milling process, or may be fOrmed by the casting. However, the jaws may instead he pre-fbrmed as a separate component, e.g. from a tougher material than the coupler's main body. The jaw may then be welded or otherwise joined to that body. That separate fabrication technique for the jaw, however, is also preferably used when the coupler's main body is made from plate stock, rather than by a casting technique.</p>
<p>Preferably the depth dimension of the partially occluded jaw is onented in a direction that is inclined from parallel to the longitudinal direction of the coupler. The depth dimension of the jaw may, however, he parallel to that longitudinal direction of the coupler. Most preferably, however, the angle of inclination faces upwards. The angle may be up to 20 from the parallel direction, but most preferably it is about 10 from the parallel direction.</p>
<p>Preferably the front jaw has a width that is less than the widest width of the coupler -the width of the front jaw is measured in a lateral direction of the coupler.</p>
<p>Preferably the downwardly facing jaw has two longitudinally spaced end walls. Preferably the gap between the end walls is wider than the depth of the first jaw -the width of the gap is measured along the longitudinal direction of the coupler) Preferably the gap of the downwardly facing jaw is at least one and a half times wider than 1 5 the diameter of a second pin of an attachment suitable fbr attaching to the coupler. The width of the gap might even be two or three times wider than such a pin. This feature allows the coupler to be used for attaching a wide range of different attachments to the same excavator anTi, the attachments having a range of different pin spacings, i.e. the spacing between the pin centres on the attachments).</p>
<p>Preferably the downwardly facing jaw has a profile that comprises two sides and a top that extends between the two sides. [he top preferably comprises two concave end portions and a central convex portion between the two concave end portions. [hose portions may be blended together SO as to provide a top for the jaw with a smooth profile or shape.</p>
<p>Preferably the convex portion has a radius, the centre of which lies substantially on the pivoting axis of the hook (when the coupler has a pivoting latching hook tbr the downwardly facing jaw).</p>
<p>Preferably the two sides are profiled so as partially to occlude the opening of the downwardly facing jaw. The sides may be rounded off at that opening, and may also be blended with the concave end portions of the top of the jaw.</p>
<p>The lips of the front jaw may extend sharply inward from the upper and lower walls of the jaw, like teeth. More preferably, however, the inside wall of each lip has a curve that blends the upper or lower wall so as to give a smooth profile.</p>
<p>The tips of the lips may he rounded or squared off.</p>
<p>Preferably the lips of the front jaw (or each half of' it, if bifurcated) are integrally fbrmed with the rest of the front jaw, thereby making the jaw a unitary structure.</p>
<p>1 0 The lips provide two dams that can resist movement of' the first pin out of that jaw (i.e. alter it has been located into the jaw by passing it through the opening (i.e. through the gap between the lips).</p>
<p>Prior art front jaws usually have no lips, or no more than a small ridge. As a result, in prior art front jaws, a pin would normally be free to fall out of the jaw if it was allowed to slide in the jaw (i.e. if it was not secured into the back of the jaw by the engagement of' the latching hook (or plate) against the other pin). The dams of the present invention prevent that freedom to fill out of the jaw.</p>
<p>It is noted, however, that Figure 1 of GB2332417 shows a front jaw having a lip on its bottom wall. That coupler, however, also requires a latch for closing that jaw. The present invention therefore also provides: an excavator coupler having a top either that is attached to, or that is for attachment to, an excavator arm of a digger, the coupler having a bottom to which an attachment, such as a bucket, can be, or is, connected, the attachment having at least one pin, wherein the coupler comprises a front jaw for engaging that pin, the jaw having an opening for the pin, the opening facing generally longitudinally relative to the length of the coupler and the jaw comprising an interior space, and at least one lip that partially occludes the interior space so as to provide a profile for the jaw that has a widened interior relative to the opening of the jaw, the lip being provided on either an upper wall of the jaw or on a lower wall of'the jaw, the front jaw not being associated with a latching means.</p>
<p>Preferably the profile of the intermediate portion of the interior space is stepped outwardly relative to both the back portion and the or each lip, and more preferably both in the upper and lower walls ol the jaw. The intermediate portion may, however, he stepped outwardly only from the or each lip, or from the or each lip and just one of the upper wall or the lower wall of the back portion.</p>
<p>The height of the or each lip is preferably between 8 and 20 mm, and more preferably between 10 and I 7 mm. Preferably the height of the or each lip is between one eighth and OflC thir(l of the diameter of the pin fbr which the jaw was designed (or higher), or between one eighth and one third of the height of the opening of the jaw (or higher) or between one eighth and one third of the height (or diameter) of the back portion of the jaw. Most prefirably, however, it is about one quarter of the diameter of the pin fbr which the jaw was designed, or about one quarter of the height of' the opening of' the jaw or about one quarter of the height (or diameter) of'the back portion of the jaw.</p>
<p>Preferably, if a line was to extend across the opening of the jaw, that line would extend substantially perpendicularly between the top and the bottom of the coupler. More preferably, however, the lower half of the jaw projects further outward than the upper half of the jaw, whereby that line would be angled by 100, or more, from that perpendicular.</p>
<p>Then, where two lips are provided, a pin jumping around in the jaw (i.e. when the attachment and coupler are inverted such that the attachment is on top of' the coupler, e.g. when the excavator arm and the attachment are in the crowd position) would not readily jump from behind the lip in the upper wall (i.e. the one that is now lowermost due to the inversion) to a position on top of' the opposite lip, but instead would jump to a position behind that opposite lip. This makes the pin even less likely to jump out of the jaw. It should he appreciated, however, that that jumping problem does not occur with the coupler and attachment oriented the normal way up (i.e. with the attachment below the coupler).</p>
<p>That is because the weight of the attachment will keep the pin behind the bottom lip.</p>
<p>Preferably, the intermediate portion having the widened dimension is defined by cut-outs in either or both of the upper and lower walls of the jaw. The cut-outs extend across the full width of the jaw (i.e. laterally across the coupler). The lips and the back portion are then the parts of'the jaw that lie fbrward and rearward, respectively, of those cut-outs.</p>
<p>Preferably the intermediate portion is defined by a cut-out having a depth and a width, the width (measured longitudinally relative to the coupler) being at least twice the depth. More preferably, the width is more than three times the depth, and most preferably the width is more than four times the depth. This arrangement is to allow the pin to fall full depth into the cut-out, rather than being prevented from doing so because the cut-out is too narrow.</p>
<p>Preferably the cut-out is between 8 and 20 mm deep (whereby a lip height of between 8 and 20mm is provided). More preferably, the cut-out is between 12 and 1 7 mm deep. 1 0</p>
<p>Preferably the cut-out is between 40 and 80 mm long. More preferably the cut-out is between 46 and 72 mm long.</p>
<p>The present invention also provides an excavator coupler having a top either that is 1 5 attached to, or that is fbr attachment to, an excavator arm of a digger, the coupler having a bottom to which an attachment, such as a bucket, can he, or is, connected, the attachment having at least one pin, wherein the coupler comprises a front jaw for engaging that pin, the jaw having an opening fbr the pin, the opening facing generally longitudinally relative to the length of the coupler and the jaw comprising an interior space, and at least one lip that partially occludes the interior space so as to provide a profile for the jaw that has a widened interior relative to the jaw's opening, the lip being provided on an upper wall of the jaw.</p>
<p>Preferably no moving latch or catch is provided fbr the front jaw.</p>
<p>Preferably the downwardly facing jaw is associated with a latch or catch. That latch or catch is preferably a pivoting latching hook, although it might instead slide between its open and closed positions.</p>
<p>A safety pin or a blocking bar might be provided for the latch or catch.</p>
<p>The present invention also provides a combination of an attachment (such as a bucket) and a coupler, the coupler having a front jaw and the attachment having a pin for engagement with the front jaw, the front jaw having a front opening extending generally in the longitudinal direction of the coupler relative to the length of the coupler, the jaw having an upper wall with a cut-out therein defining a back portion rearward thereof and a lip forward thereof.</p>
<p>In each embodiment of the present invention, the opening should face flO more than 20 from that longitudinal direction of the coupler, hut more preferably no more than 1 5 from that longitudinal direction of the coupler. I'he longitudinal direction extended between the front and rear ends of the coupler, i.e. generally parallel to the top, the bottom and the sides of the coupler.</p>
<p>Couplers, both of the prior art and of the present invention, usually have a side plate that is positioned nearer the top of the coupler than the jaw, which side plate lies in a plane that is laterally stepped outwardly from the side of the coupler's front jaw. That step-out defines a step-face that faces downwardly, i.e. towards the two jaw. It is preferred that the couplers of the invention similarly have such a step-face.</p>
<p>In conventional attachments, e.g. buckets, the front pin, i.e. the pin for the front jaw of a coupler, is mounted substantially perpendicularly between two plates. Each plate has an upper surface (or is capped by something having an upper surface). In use that upper surface faces the step-face. Preferably, therefore, in accordance with another aspect of the present invention there is provided a combination comprising a coupler of the present invention (as defined above) having both a front jaw and a step-face and an attachment having both a upper surface and a front pin for engagement in the front jaw, wherein the upper surface, in use, faces the step-face, and wherein the front jaw of the coupler is spaced sufficiently downward from the step-face to allow the upper surface of the attachment, in use, to be spaced from the step-face both when the front jaw and the pin are properly seated together, and when the pin is sitting behind the lip in the upper wall, perhaps in a cut-out that defines that lip. This stops any rubbing occurring between the coupler and the attachment, and will prevent the engagement of the upper surface with the step-face from preventing the pin from falling into the cut-out, or from falling behind the lip.</p>
<p>These and other features of the present invention will now he described in more detail with reference to the accompanying drawings in which: Figure 1 shows a coupler of the present invention fitted onto an excavator arm of a digger with an attachment -a bucket -attached thereto; Figure 2 is a perspective view of a preferred coupler of the present invention (all moving elements have been removed for clarity); 1 0 Figures 3 and 4 are opposite side views of the prefirred coupler of the present invention, again with the internal mechanism removed; Figure 5 is an end view of the preferred coupler, showing a one-piece jaw.</p>
<p>1 5 Figures 6 to 9 are sectional views through preferred front jaw configurations.</p>
<p>Referring first of all to Figure 1, the excavator digger 10 has a rear excavator arm 12. The arm 12 has a coupler 14 of the present invention attached thereto by way of pins, as known in the art. The coupler 14 attaches a bucket 16 to the excavator arm 12 of the digger 10 again by way of pins, as known in the art. The excavator arm 12, the bucket 16 and the digger 10 are all shown in dotted lines since only the coupler is of interest in the present case.</p>
<p>Instead of a bucket 16, some alternative excavator attachment might be secured to the excavator arm 12 of the digger 10 by the coupler 14.</p>
<p>As shown in Figures 2 to 5, the coupler 14 comprises a top portion I 8, a bottom portion 20, and two ends 22, 24. In normal use, the front end 24 is the one that is shown to the right in Figure 3 and the rear end 22 is the one that is shown to the left in Figure 3. The front end 24 is therefore the end that would usually point towards the digger when the digger operator is attempting to couple an attachment to the coupler. By this arrangement, the operator can see the front end so as to assist that coupling operation -that front end will need to be brought into alignment with the attachment during a first step of the eoupling operation.</p>
<p>The top portion 18 compnses two pairs of holes 26 for attaching the coupler 14 to the excavator arm 12 by using pins, as shown in Figure 1. The bottom portion 20, however, has two jaws 28, 30. Those jaws are also for engaging pins, but this time they are pins 32 of the bucket 16 (see Figure I).</p>
<p>The first jaw 28 faces downwardly. It is called the downwardly facing jaw 28. The second jaw 30 faces longitudinally out of the front end 24 of the coupler 14. It is called the front jaw 30.</p>
<p>The coupler is also provided with a lifting eye 36, which can be used to attach things to the coupler lbr example with a rope or a chain.</p>
<p>Although not shown, the first jaw 28 is associated with a pivoting latching hook, as in GB2330570. It will be appreciated, however, that a sliding plate or sliding hook might be substituted for the pivoting latching hook, as in US6699001.</p>
<p>The latching hook pivots about a pivot hole 34 on a rod (not shown), and its operation is known from (3B2330570. A detailed discussion of the operation of that latching hook is thereibre not required in this application.</p>
<p>The second, or front jaw 30 faces towards the front end 24 of the coupler 14 (almost parallel to the longitudinal dimension of the coupler -it is inclined at an angle ofjust 10 in the illustrated embodiments). It opens at that end 24 at an opening, as shown in Figure 5.</p>
<p>The opening of the jaw is partially occluded by both a top lip 38 and a bottom lip 40.</p>
<p>Further, those lips 38,40 extend across a significant part of the width of the coupler 14. In an alternative embodiment, however, the lips 38,40 may be intermittent across the width of the coupler, like spaced-apart teeth.</p>
<p>The jaw is made as a solid one piece jaw of a toughened steel. The body is made by casting. l'he jaw is then welded into that cast body. That construction might be replaced, however, with an additional number of components that are welded together. For example, there might he a bifurcated jaw fbrrned from two appropriately shaped side plates that are welded onto a frame, the side plates having two matching jaws cut into them. 1'he lips then might extend just across the widths of those sidewalls.</p>
<p>The lips provide the jaw with a new profile, when compared to the front jaw in GB2330570. 1 0</p>
<p>The profile of thejaw includes the lips 38, 40, a substantially semi-circular back portion 42 and an intermediate portion 44. The lips 38, 40 have opposing flat faces that are parallel to each other, whereby there s a constant gap between them. The opposing faces might instead he rounded, however.</p>
<p>The gap between the top and bottom lips 38, 40 of the jaw 30 defines a jaw opening dimension. In this embodiment, that dimension corresponds with the diameter of the back portion 42 of the jaw 30.</p>
<p>Between the lips 38, 40 and the back portion 42 there is the intermediate portion 44. The intermediate portion 44 is widened relative to them both. This makes the lips 38, 40 partially occlude the interior space defined by the back portion and the intermediate portion.</p>
<p>The intermediate portion is both widened relative to the dimension of the gap between the lips and widened relative to the diameter of the back portion of the jaw 30. It might, however, only be widened relative to the gap between the lips -the back portion would then not be distinct from the intermediate portion. Nevertheless, in the illustrated embodiment, the intermediate portion 44 wis widened relative to the back portion and the lips by two stepped out portions (or cut-outs). One is in the upper wall 46 of the jaw. The other is in the lower wall 48 of the jaw 30. Those cut-outs each comprises an angled step (the two steps are substantially opposite each other, although the step 50 in the lower wall 48 is slightly further forward than the step 50 in the upper wall 46). The step 50 (more clearly seen in Figure 9, which shows the jaw's preferred dimensions for a pin having a diameter of 80mm) diverges from the back portion 42 to a flat wall section 52. Then that flat wall section 52 extends frward up to the lip, with a rounded or blended section 54 joining that flat wall section 52 to the lip.</p>
<p>The transitions between the back portion 42, the angled steps 50, the fiat wall sections 52, the rounded or blended section 54 and the lips 38, 40 can be sharp. However, they are more preferably blended so as to avoid stress concentrations. The hacksides of the lips 38, 40, however, have a straight section afier the blended section 54. The straight section butts upto the flattened tips of the lips, which flattened lips define the opening. That transition may also be rounded, as can the opening. Indeed, the tips of the lips can he rounded.</p>
<p>As discussed above, a lip is provided for the lower wall of the front jaw of the coupler shown in Figure 1 of GB23324 1 7. That jaw, however, does not have a cut-out that defines I 5 a back portion for its jaw. The present invention is additionally differentiated from that prior art coupler's front jaw by having a lip also on the upper wall 46 of the jaw 30. Yet further, the preferred embodiments of the present invention do not have a moving closing mechanism (e.g. a catch or a hook) ftr the front jaw. The front jaw in GB233241 7, however, does require a moving closing mechanism.</p>
<p>in alternative embodiments of the present invention, only a single cut-out might be provided, either in the upper wall or in the lower wall, or the transitions between the various parts of the jaw might be more or less blended than that illustrated, or the back portion 42 might be wider or narrower than the gap between the lips, or even the intermediate portion 44 may be either more or less pronounced (i.e. more or less widened relative to either the lips or the back portion or both of them).</p>
<p>The jaw configuration of the present invention, in use, enables a pin to retain its location within the front jaw 30 even in the event that the latching hook provided for the other jaw (i.e. the downwardly facing jaw 28) is inadvertently withdrawn from a latched position to an open or unlatched position, whereby the pin would normally have been free to fall out of the front jaw since the longitudinal position of the pin was no longer restrained by that hook. There are two scenarios where that inadvertent decoupling might have happened: 1. If the coupler is in its upright position, i.e. above the bucket, the pin in the downward facing jaw would he free to swing out of that downwardly facing jaw if the coupler was to he hued by rotation of the bucket about the pin in the front jaw. Once swinging freely (i.e. once the bucket is also lifted, only the front jaw would be holding the weight of the bucket, via the pin in that front jaw. Naturally, while the pin remains in the back portion of the front jaw, the bucket will be carried. However, if the front jaw was to he pointed downwardly by rotating the coupler, then the pin in that front jaw would be likely to slide out of that back portion. Without the lip, the pin would then fall out of the 1 0 coupler. The lip of the present invention, however, catches the pin before it falls out, thereby preventing the pin from falling out. That lower lip, in other words, forms a dam over which the bucket pin is unlikely to be able to pass without violent shaking or careful manipulation of the excavator arm.</p>
<p>2. If the coupler was the other way up, i.e. in the "crowd" position, then it is the other lip that forms the dam. However, in that orientation, the pin in the "downwardly facing" jaw (i.e. the one now pointing upwardly since the coupler is inverted) will not try to disengage from that jaw as readily anyway since the weight of the bucket holds the pin in that jaw, which in turn restricts the amount of sliding available to the pins to, at most, the free width of that downwardly facing jaw. Unfortunately, however, that free width can be sufficiently long in couplers designed to fit to attachments having a very wide range of pin spacings to allow disengagement of the front pin from the front jaw. The dam, therefore,again serves to prevent that disengagement. The lip in that upper wall, therefore, is of particular benefit for universal couplers, i.e. couplers designed to fit attachments having a wide range of different pin centre spacings.</p>
<p>The lips also provide the advantage that no latching means (or other moving part) for the front jaw is needed in order to resist the disengagement of a pin from that front jaw in the event of an inadvertent disengagement of the latching hook for the downwardly facing jaw.</p>
<p>The jaw, therefbre, provides an inherent safety feature, i.e. one involving no moving parts that can fhil.</p>
<p>Referring now to Figures 6, 7, 8 and 9, various preferred front jaw dimensions are provided.</p>
<p>The jaw in Figure 6 is a preferred jaw for a pin of 80mm diameter. It has a dual radiused hack portion 40.1mm and 35.1mm. It will therefore seat either a 80mm pin or a 70mm pin. It has symmetrical cut-outs, each being 70mm wide and I 7mm deep. The ramp 50 is rounded rather than straight, unlike that of Figure 9, and the blended section 54 mirrors the shape of that ramp 50.</p>
<p>The two cut-outs will both allow a 80mm pin to fall into them to a depth that is about OflC quarter of the diameter of the pin (actually 1 7/80 of' the diameter). The jaw is also angled upward from the longitudinal direction of the coupler by 10 .</p>
<p>The jaw in Figure 7 is a preferred jaw for a pin of 65mm diameter. It also has a dual radiused back portion 32.6mm and 30.1mm. It will therefore seat either a 65mm pin or a 60mm pin, It also has the symmetrical cut-outs, like the jaw in Figure 6. The cut-outs are 60mm wide and 17mm deep. The cut-outs will therefore allow a 65mm pin to fall into them to a depth that is about one quarter of the diameter of the pin (actually 1 7/65 of the diameter). The jaw is also angled upward from the longitudinal direction of the coupler by 10 .</p>
<p>The jaw in Figure 8 is a preferred jaw for a pin of 50mm diameter. It also has a dual radiused back portion -25.1mm and 22.6mm. It will therefore seat either a 50mm pin or a 45mm pin. It also has the symmetrical cut-outs, like Figures 6 and 7, however, the ramp 50 and the blended section 54 is even more rounded. The cut-outs are both 46mm wide and 12mm deep. The cut-outs will therefore allow a 50mm pin to fall into them to a depth that is about one quarter of the diameter of the pin (actually I 2/50 of the diameter). The jaw is also angled upward from the longitudinal direction of the coupler by 10 .</p>
<p>Finally there is the jaw of Figure 9. It is a alternative, but still preferred jaw fbr a pin of 80mm diameter. It does not have a dual radiused back portion. The back portion has a fixed radius of 40.1mm. The 80mm pin will therefore seat very securely in the back portion. As such, the coupler will be able to endure a higher loadings. The cut-outs are not symmetrical since 1. the ramp 50 and the blended section 54 do not match and 2. Since they arc not opposite each other. Further, their shapes are not mirrored on each other. One is 20mm deep (in the lower wall) and the other is 1 7mm deep (in the upper wall.</p>
<p>Additionally, the lower one is 74mm long, whereas the upper one is 72mm long. The lower lip 40 will therefore provide a more resistant dam for the pin than the upper lip 38.</p>
<p>Nevertheless the pin does still full into them to a depth that is about OflC quarter of the diameter of the pin.</p>
<p>As with the other jaws, this last jaw is also angled upward from the longitudinal direction 1 0 of the coupler by 100.</p>
<p>The present invention has been described above purely by way of example. However, modilication in detail to the present invention may be made within the scope of the invention as defined in the claims appended hereto.</p>
Claims (1)
- <p>CLAiMS I. An excavator coupler having a top either that is attached to,or that is for attachment to, an excavator arm of a digger, the coupler having a bottom to which an attachment, such as a bucket, can be, or is, connected, the attachment having at least one pin, wherein the coupler comprises a front jaw For engaging that pin, the jaw having an opening for the pin, the opening thcing generally longitudinally relative to the length of the coupler and the jaw comprising an interior space, and lips that partially occlude the interior space so as to provide a profile for the jaw that has a widened interior relative either to the gap between the lips or to the opening of the jaw, if narrower, and wherein one lip is provided on an upper wall of the jaw and the other lip is provided on a lower wall of the jaw.</p><p>2. An excavator coupler having a top either that is attached to, or that is fbr attachment to, an excavator arm of a digger, the coupler having a bottom to which an attachment, such as a bucket, can be, or is, connected, the attachment having at least one pin, wherein the coupler comprises a front jaw fbr engaging that pin, the jaw having an opening fbr the pin, the opening facing generally longitudinally relative to the length of the coupler and the jaw comprising an interior space, and at least one lip that partially occludes the interior space so as to provide a profile fbr the jaw that has a widened interior relative to the opening of the jaw, the lip being provided Ofl either an upper wall of the jaw or on a lower wall of the jaw, the front jaw not being associated with a latching means.</p><p>3. An excavator coupler having a top either that is attached to, or that is fbr attachment to, an excavator arm of a digger, the coupler having a bottom to which an attachment, such as a bucket, can be, or is, connected, the attachment having at least one pin, wherein the coupler comprises a front jaw for engaging that pin, the jaw having an opening for the pin, the opening facing generally longitudinally relative to the length of' the coupler and the jaw comprising an interior space, and at least one lip that partially occludes the interior space so as to provide a profile fbr the jaw that has a widened interior relative to the jaw's opening, the lip being provided on an upper wall of the jaw.</p><p>4. The coupler of any one of the preceding claims, wherein the jaw's interior space has an intermediate portion behind the or each up that is widened relative to the gap defined by the opening and also widened relative to a back portion of the interior space.</p><p>5. The coupler of claim 4, wherein the hack portion of the jaw is radiused in profile.</p><p>6. The coupler of any OflC of the preceding claims, wherein the front jaw has a solid construction extending across full width of the coupler.</p><p>7. The coupler of any one of claims I to 5, wherein the front jaw is bifurcated, each half being formed in one of the coupler's two side plates.</p><p>8. The coupler of any one of the preceding claims, wherein the depth dimension of the front jaw is oriented in a direction that is inclined from parallel to the longitudinal direction of the coupler.</p><p>9. The coupler of any one of the preceding claims, wherein the coupler is provided with another jaw which is downwardly fitcing.</p><p>10. 1'he coupler of claim 9, wherein the downwardly facing jaw has a latching hook or plate asSOclate(l with it.</p><p>II. The coupler of claim 10, wherein the latching hook or plate is a pivoting latching hook.</p><p>12. The coupler of claim 10 or claim 11, additionally comprising a safety pin or a blocking bar fhr positioning behind or through the hook or plate fir locking or blocking it.</p><p>13. The coupler of any one of claims 9 to 12, wherein the downwardly facing jaw is wider (i.e. longer in the longitudinal direction) than the depth of the front jaw.</p><p>14. The coupler of any one of the preceding claims, wherein the profile of an intermediate portion of the interior space is stepped outwardly relative to both a hack portion of the jaw and the or each lip.</p><p>I 5. The coupler of any one of the preceding claims, wherein the profile of an intermediate portion of the interior space is stepped outwardly relative to both a hack portion of the jaw and a lip of the jaw in both the upper wall and the lower wall of the jaw.</p><p>16. The coupler of any one claims I to 13, wherein the profile of an intermediate 1 0 portion of the interior space is stepped outwardly from the or each lip, but is not stepped outwardly relative to a back portion of the jaw..</p><p>17. The coupler of any one of claims I to 13, wherein the profile of an intermediate portion of the interior space is stepped outwardly from a back portion of the jaw in just one of the upper wall and the lower wall of the jaw, and also from the or each lip.</p><p>18. The coupler of any one of claims 14 to 17, wherein the width of the intermediate portion, measured in the longitudinal direction of the coupler, is at least twice the height of the tallest lip of the front jaw.</p><p>19. The coupler of any one of the preceding claims, wherein the tallest lip of the jaw has a height of between 8 and 20mm.</p><p>20. The coupler of any one of the preceding claims, comprising no active latch or catch for the front jaw.</p><p>21. A coupler substantially as hereinbefore described with reference to the accompanying drawings, 22. A jaw of a coupler, the jaw having a profile that is substantially as hereinbefore described with reference to the accompanying drawings.</p>
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0525379A GB2433245B (en) | 2005-12-13 | 2005-12-13 | Coupler with improved jaw configuration |
GB0624873A GB2433246B (en) | 2005-12-13 | 2006-12-13 | Coupler with improved jaw configuration |
US11/610,211 US20070157492A1 (en) | 2005-12-13 | 2006-12-13 | Coupler With Improved Jaw Configuration |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0525379A GB2433245B (en) | 2005-12-13 | 2005-12-13 | Coupler with improved jaw configuration |
Publications (3)
Publication Number | Publication Date |
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GB0525379D0 GB0525379D0 (en) | 2006-01-18 |
GB2433245A true GB2433245A (en) | 2007-06-20 |
GB2433245B GB2433245B (en) | 2009-08-12 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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GB0525379A Active GB2433245B (en) | 2005-12-13 | 2005-12-13 | Coupler with improved jaw configuration |
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GB (1) | GB2433245B (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4854812A (en) * | 1986-06-20 | 1989-08-08 | J. I. Case Company | Quick coupler assembly |
GB2332417A (en) * | 1997-12-16 | 1999-06-23 | Redrock Eng Ltd | Safety latches for an attachment device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2330570B (en) * | 1998-09-08 | 1999-09-15 | Miller Ronald Keith | Quick coupler for bucket excavators |
JP2000144789A (en) * | 1998-11-09 | 2000-05-26 | Komatsu Ltd | Working-machine attachment mounting-demounting device |
IES20040194A2 (en) * | 2003-09-18 | 2005-03-23 | Caroline Mccormick | An excavator tool quick attachment device |
US20050169704A1 (en) * | 2004-01-16 | 2005-08-04 | Alan Vu | Mortise and tenon joint |
-
2005
- 2005-12-13 GB GB0525379A patent/GB2433245B/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4854812A (en) * | 1986-06-20 | 1989-08-08 | J. I. Case Company | Quick coupler assembly |
GB2332417A (en) * | 1997-12-16 | 1999-06-23 | Redrock Eng Ltd | Safety latches for an attachment device |
Also Published As
Publication number | Publication date |
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GB2433245B (en) | 2009-08-12 |
GB0525379D0 (en) | 2006-01-18 |
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