Excavating – Digging edge – Tooth or adaptor
Patent
1995-06-03
1998-09-15
Melius, Terry Lee
Excavating
Digging edge
Tooth or adaptor
37456, 37458, E02F 928
Patent
active
058062157
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
THIS INVENTION relates to improvements in and relating to excavator tooth retaining assemblies.
BACKGROUND ART
More particularly, the invention has reference to novel retaining pin constructions and arrangements for use in releasably securing an excavating tooth or point or tip (hereinafter for convenience called "a ground-engaging tooth point member") to its mounting adaptor. The latter is conventionally of the type having a forwardly disposed nose portion and a rearwardly dispose base portion, and the tooth point member has a socket or pocket formed in its rear section for receiving said nose portion of the adaptor.
Such arrangements are usable in various applications, the most common being a loading bucket as used by draglines, front end loaders, tracked earth moving machines and the like. The ground engagement of the tooth point members causes them to become worn and thus ineffective over a period so that they require to be replaced. Thus, the nature, type, disposition and accessibility of the retaining pins used for securing the tooth point members to their adaptors can be most important relative to achieving desirable removability, while being efficient in all operational aspects.
Over many years there has been considerable development and improvements in the art of connecting tooth point members to adaptors by suitable retaining pin means. It is currently sought to provide a retaining pin which may be easily fitted in its operative position, will remain there during normal operations until such time as the ground-engaging tooth point member requires replacement, and then will be easily removed. For many years such a standard type of retaining pin has been inserted through registering apertures extending respectively through the tooth point member and adaptor and forcibly hit with a hammer until caused to be deformed and thereby retain the tooth point member by an interference fit. Removal of the deformed pin is then achieved by again hitting it with a hammer to force it out of the apertures a procedure which may be very difficult and time consuming. Alternatively the retaining pin may fall from the apertures unintentionaly during operation when operational forces may act on the pin in the direction of pin removal and force it out.
U.S. Pat. No. 4,326,348 of Esco Corporation and Australian Patent No. 620074 of Caterpillar Inc. show pin fastening assemblies which overcome the problem of pins inadvertently falling out of their apertures during operation by having the pins disposed horizontally. This method, however has largely been rejected by the industry due to the difficulty in accessing the apertures from the sides of the tooth point members as the tooth point members are disposed in a side by side configuration with insufficient working space therebetween.
Current vertically disposed retaining pins including that of Australian Patent No. 617545 of Esas Corporation require a separate elastic or spring retainer to maintain each pin in its retaining position. In this example the pin is maintained in position by compressing an elastic component to generate interference when fitted. Due to the work carried out by the tooth point members in operation, movement causes frictional heat to which the elastic material is subjected leading to its degradation and subsequent reduced maintaining ability whereby the pin may fall out of its retaining position.
Notwithstanding the prior art as aforementioned, I have considered there remains a need for substantial improvements in locking pin arrangements for such tooth point members, particularly to overcome present disadvantages arising from the manner in which the parts currently lock together and are difficult to access and to remove, as well as current tendencies for the pins to be insecure or to fall out. Thus, my invention aims to provide a novel form of retaining pin means which may be simply used to achieve efficiency in those aspects in which previous constructions have been found wanting. In particular, the invention aims to provide an i
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Beach Thomas A.
Matthews Carol Thelma
Melius Terry Lee
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