Metal fusion bonding – Process – With supplementary mechanical joining
Reexamination Certificate
1998-09-15
2001-04-03
Heinrich, Samuel M. (Department: 1725)
Metal fusion bonding
Process
With supplementary mechanical joining
C228S189000
Reexamination Certificate
active
06209775
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a bracket mounting arrangement for machine frames and, in particular, to a bracket mounting arrangement for interconnecting the horizontal and vertical frame members of core molding machine frames.
2. Description of the Related Art
Core molding machine frames typically include lower and upper horizontal support frame assemblies connected together by a plurality of vertical posts. Lower and upper platens are supported on the lower and upper support frames, respectively, and are adapted for vertical movement toward and away from each other through hydraulics or other conventional means. Lower and upper core molds are attached to the lower and upper platens, respectively, and are positioned on the platens so that the molds are in mutual alignment for a molding operation. The vertical posts are typically secured to the lower and upper frames through mounting bolts that are either parallel or perpendicular to the vertical posts. As the core molds are pressed toward each other and come into mutual contact during the molding process, opposing forces from the hydraulics put the core molds in compression. Equal but opposite tensile forces are transmitted to the vertical posts, and consequently, the mounting bolts are subjected to shear or tensile forces. The shear or tensile forces tend to deform the bolts along their longitudinal axis, and depending on the orientation at which the bolts are mounted, they can either bend or their threads can become worn or stripped. The bolts may also suffer from work hardening due to repeat cycling of the core molding operation. In any event, movement between the cross members and vertical posts eventually occurs and consequently affects the quality of the molded components. Eventual failure of the connection between the vertical posts and cross members can lead to disastrous results, high repair costs, and machine down time.
SUMMARY OF THE INVENTION
These and other problems of the prior art are overcome by the provision of a bracket mounting arrangement for interconnecting the horizontal and vertical members of a machine frame. According to one aspect of the invention, a bracket for a machine frame comprises a first leg adapted for attachment to the machine frame vertical member and a second leg integrally formed with and extending from one end of the first leg and being adapted for attachment to the machine frame horizontal member. A free end of at least one of the first and second legs has a tapered portion for further attachment of the bracket to the machine frame to transfer only tensile forces acting on the vertical member to the bracket. The bracket is preferably formed of a plate material and the first and second legs are of unitary construction. The bracket is preferably attached about its periphery to the machine frame.
According to a further aspect of the invention, at least one opening extends through the bracket for further attachment of the bracket to the machine frame.
According to an even further aspect of the invention, the bracket includes a pair of first legs integral with and extending from the second leg. A free end of each first leg is provided with a tapered portion for further attaching the bracket to the machine frame.
According to another aspect of the invention, a method of constructing a machine frame having at least one horizontal member for connection to at least one vertical member subject to tensile forces includes providing a bracket having a first leg and a second leg integrally formed with and extending from one end of the first leg. At least one of the first and second legs has a free end with a tapered portion attached to the machine frame. The vertical member is attached to the at least one horizontal member by welding the bracket around its periphery to the vertical member and horizontal member, such that only tensile forces acting on the vertical member are transferred to the bracket.
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patent: 2088012 (1982-06-01), None
Hayes Lemmerz International Inc.
Heinrich Samuel M.
Varnum Riddering Schmidt Howlett LLP
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