Boom and dipper stick construction
AssigneeJ. I. Case Company
InventorsAllan J. Albrecht, Richard C. Van Ooyen
Life of this patent
Estimating the term…
Abstract
A boom and dipper stick construction for mobile excavators and an improved method of manufacturing the same. The boom and dipper stick are fabricated from side plates that are butt welded together with respect to various hinge point locations to eliminate the necessity of doubler plates on the sides of the structures. The butt welds are located at non-critical areas to provide for even stress flow and ease of manufacture. A method of welding together the side plates of the boom and dipper stick construction in an end to end abutting relationship in a manner which attains a complete weld penetration over the entire length of the joint.
Claims13
In an earth working vehicle having a self-powered frame structure, a platform supported on said frame structure, a boom having a first end pivotally secured to said platform about a substantially horizontal axis, a dipper stick pivoted intermediate its ends about a substantially horizontal axis to a second end of said boom, a material handling attachment pivoted to a first end of said dipper stick about a substantially horizontal axis, a first fluid motor means extending between said platform and an intermediate portion of said boom, a second fluid motor means extending between an intermediate portion of said boom and a second end of said dipper stick, and a third fluid motor means extending between an intermediate portion of said dipper stick and said material handling attachment;
- an improved boom construction comprising:
- a pair of spaced apart outside side plate assemblies, said outside side plate assemblies having front and rear connecting ear plates which have first and second bearing means respectively connected thereto for receipt of pivot pins to connect same respectively to said platform and said dipper stick, said side plate assemblies having front and rear side plates which are secured together in an end to end abutting relationship and secured between said connecting ear plates in an end to end abutting relationship, said front side plates having third bearing means mounted therebetween for pivotal receipt of said second fluid motor means, said rear side plates having fourth bearing means mounted therebetween for pivotal receipt of said first fluid motor means;
- a top plate assembly secured between the upper portions of said side plate assemblies;
- a bottom plate assembly secured between the lower portions of said side plate assemblies;
- an inside rear plate secured between said top plate assembly and said bottom plate assembly and said rear side plates rearward of said fourth bearing means;
- an inside forward plate secured between said top plate assembly and said bottom plate assembly and said rear side plates forward of said fourth bearing means;
- and a pair of spaced inside center plates secured between said inside rear plate and said inside forward plate so as to form a box structure therewith, said fourth bearing means extending through and secured to said rear side plates and said inside center plates.
In an earth working vehicle having a self-powered frame structure, a platform supported on said frame structure, a boom having a first end pivotally secured to said platform about a substantially horizontal axis, a dipper stick pivoted intermediate its ends about a substantially horizontal axis to a second end of said boom, a material handling attachment pivoted to a first end of said dipper stick about a substantially horizontal axis, a first fluid motor means extending between said platform and an intermediate portion of said boom, a second fluid motor means extending between an intermediate portion of said boom and a second end of said dipper stick, and a third fluid motor means extending between an intermediate portion of said dipper stick and said material handling attachment;
- an improved dipper stick construction comprising:
- a pair of spaced apart side plate assemblies, said side plate assemblies having upper and lower side plates which are secured in an end to end abutting relationship to an intermediate side plate, said upper side plates having first and second bearing means connected thereto for respective connection to said second fluid motor means and said boom, said lower side plates having third bearing means connected thereto for connection to said material handling attachment, said intermediate side plates having fourth bearing means connected thereto for connection to said third fluid motor means, said fourth bearing means including a bearing cylinder extending through and welded to each of said intermediate side plates and a ring plate received around and welded to each of said bearing cylinders and said intermediate side plates;
- and an end plate assembly secured between said side plate assemblies generally adjacent the outer periphery thereof.
Dependencies are inferred from the claim text.