US 4,544,068 AGranted

Laboratory glassware rack for seismic safety

AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration

InventorMarc M. Cohen

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Abstract

A rack (10) for laboratory bottles and jars for chemicals and medicines has been designed to provide the maximum strength and security to the glassware in the event of a significant earthquake. The rack (10) preferably is rectangular and may be made of a variety of chemically resistant materials including polypropylene, polycarbonate, and stainless steel. It comprises a first plurality of parallel vertical walls (14, 32, 33, 16, etc.), and a second plurality of parallel vertical walls (18, 30, 31, 20, etc.) perpendicular to the first plurality of walls. These intersecting vertical walls comprise a self-supporting structure without a bottom which sits on four legs. The top surface of the rack is formed by the top edges of all the vertical walls, which are not parallel but are skewed in three dimensions. These top edges form a grid matrix having a number of intersections (22, 24, etc.) of the vertical walls which define a number of rectangular compartments having varying widths and lengths and varying heights. The distribution of sizes and heights for the compartments (26, 28, 38, etc.) is based on a mathematical analysis and the generation of several lines on a graph which were matrixed against each other to generate a grid on a hyperbolic-paraboloid curved surface. The rack design which corresponded closely to the actual dimensions of typical laboratory glassware resulted in a one fourth section of a hyperbolic-paraboloid "umbrella." The rack can be subdivided along latitudinal or longitudinal middle partition lines so that shelf top or counter top "half modules" can be provided.

Claims2

Dependent claims

A rectangular rack for restraining the lateral motion of a diverse collection of laboratory glassware containers having bottom surfaces resting on a support beneath the rack, said rack comprising:

a base comprising a plurality of individual feet, each foot having an orifice therethrough adapted to receive a fastener so that said feet may be anchored to said support;
a self-supporting rectangular matrix mounted on top of said base with all of said matrix elevated from the bottom surface of said base so that a liquid may be flushed between said support and said matrix to carry away any spillage from said containers, said matrix comprising:
a first plurality of vertical parallel longitudinal walls, a second plurality of vertical parallel lateral walls, said second plurality of walls being perpendicular to said first plurality of walls and intersecting therewith to form a plurality of rectangular compartments open at the top and bottom and adapted to surround and restrain glassware containers placed therein while the bottom surfaces of the containers rest on said support, said intersecting walls being of the same height at the point of intersection, said walls of said matrix including a front wall, a rear wall, a left-most wall and a right-most wall;
said front and left-most walls being rectangularly shaped whereas the other walls have a linear-sloped upper edge where the slope increases positively from left to right for the longitudinal walls and increases positively from front to rear for the lateral walls, the slopes of said sloped longitudinal walls successively increasing from the front to the rear of the matrix and the slopes of the sloped lateral walls successively increasing from the left to the right of the matrix, the upper edges of the walls thereby collectively defining a curved surface and
the spaces between adjacent longitudinal walls being successively larger in the direction from the front to rear of the matrix, and the spaces between adjacent lateral walls being successively larger in the direction from the left to the right of the matrix whereby the size of the matrix rectangular compartments progressively increase in height and girth from the front-left corner to the rear-right corner.

2 more elements

A rectangular rack for restraining the lateral motion of a varied group of laboratory glassware containers whose bases rest on a support beneath the rack, said rack comprising:

a rigid rectangular matrix comprising a plurality of vertical parallel longitudinal walls, a plurality of vertical parallel lateral walls, said plurality of lateral walls being perpendicular to said plurality of longitudinal walls and intersecting therewith to form a plurality of rectangular compartments open at the bottom and the top and adapted to encircle and restrain glassware containers placed therein while the bases of the containers stand on said support, said intersecting walls being of the same height at the point of intersection, said walls of said matrix including a front wall, a rear wall, a left-most wall and a right-most wall;
said front and left-most walls being of equal height and each having a rectangular configuration, said longitudinal walls except said front one linearly increasing in a left-to-right direction, each one at a different rate, said lateral walls except said left-most wall linearly increasing in height in a front-to-rear direction, each one at a different rate, said height rates for said longitudinal walls increasing progressively in a front-to-rear direction, said height rates for said lateral walls increasing progressively in a left-to-right direction;
the spaces between adjacent longitudinal walls being progressively greater in the direction from front to rear of the matrix, and the spaces between adjacent lateral walls being progressively greater in the direction from the left to the right of the matrix, the top edges of said matrix walls being linear and collectively defining a hyperbolic-paraboloid surface;
and
a plurality of feet, each foot having a passageway therethrough adapted to receive a fastener so that said feet may be secured to said support, said matrix rigidly mounted on top of said feet with all of said matrix elevated from the bottom sides of said feet so that a liquid may be flushed between said support and said matrix to carry away any spillage from said containers.

2 more elements

Dependencies are inferred from the claim text.