US 5,104,049 A · Sand muller bowl liner

Abstract

A thin wall inner is positioned within the circular bowl of a sand muller to overlay the interior mulling surface upon which foundry sand is placed and is mulled by a plow blade that rotates within the bowl over its mulling surface. The bowl surface is annular and ring-like in shape. The liner is formed of a number of similar segments which are arranged together in edge to edge relationship to form an annular, ring-like cover over the bowl surface. The liner segments are secured to the bowl by bolts which extend through aligned holes in the segments and in the bowl. Most of the outer surface of the liner is spaced a short distance from the bowl surface by means of thin pads formed on the outer surface of the liner, around the area of the bolt holes. The pads contact the bowl surface, to provide a space between the remainder of the liner and the bowl surface. This space is filled with a grout-like material for bonding the liner to the bowl and for shock absorbing and load distribution. The liner is formed of a hard material which is much more wear resistant than the bowl to permit extended use of a worn bowl or to extend the life of an unworn bowl.

Claims10

Dependent claims

A sand muller bowl upon which sand is supported and mulled by a plow blade rotated within the bowl and traveling over a surface with the surface having an upstanding rim portion that substantially surrounds it for containing the sand with the bowl, comprising:

a thin wall bowl shaped liner having a floor portion and a rim portion to overlay and completely cover an interior surface of the sand muller bowl and rim, with the liner having an inner surface, upon which sand may be mulled, and an outer surface with the inner and outer surfaces corresponding in size and shape to the interior surface of the sand muller bowl and rim for closely fitting the liner within the sand muller bowl and rim and forming a substitute sand mulling surface there;
spaced apart, thin pads provided on the liner outer surface for engaging the bowl interior surface and for spacing the remainder of the liner outer surface a short distance, substantially uniformly inwardly, away from the bowl interior surface;
and
a filler material placed between, and filling the space between, the interior surface of the bowl and rim and the liner outer surface for forming a layer for bonding the liner to the bowl and rim and for absorbing and distributing mulling loads applied to the liner.

1 more element

In a sand muller bowl with a rim and having a generally angular interior mulling surface upon which sand is placed and is mulled by a plow blade traveling within the bowl over such mulling surface, the improvement comprising:

a thin wall, bowl shaped liner having a floor portion and rim portion arranged with the bowl and rim and completely overlaying an interior mulling surface of the bowl and rim, with the liner having an inner surface upon which sand may be placed and mulled by the plow, and the liner having an outer surface;
the liner inner and outer surfaces being sized and shaped to correspond to the interior surface of the bowl and rim for closely fitting the liner with in the bowl and rim to provide a substitute mulling surface therein;
means spacing a major portion of the liner outer surface away from the bowl inner surface a short distance to form a space therebetween;
a filler material filling the space and forming a thin, load absorbing and bonding layer between the liner and bowl;
said liner being formed of a material which has a greater wear resistance to sand abrasion than material out of which the bowl is made, whereby the liner may be applied within a pre-worn bowl for permitting continued use of the bowl or within an unworn bowl to extend its useful life.

2 more elements

Dependencies are inferred from the claim text.

Sand muller bowl liner

Life of this patent

Sand muller bowl liner

Life of this patent

Abstract

Claims10