Patent Application
20070023376
1. Field of the Invention
The present invention relates to metal shelving assemblies; more particularly, to stand-alone metal shelving assemblies; and most particularly, to a modular stand-alone metal shelving system that is easily assemblable without tools.
2. Discussion of the Related Art
Stand-alone metal shelving assemblies are well known. By stand-alone is meant a shelving assembly that does not require a wall for a portion of its support or stability. A stand-alone assembly may be free-standing away from a building wall or other support or stabilizing element.
A prior art modular shelving system is disclosed in U.S. Pat. No. 4,558,647. A modular shelving unit comprises at least two upright members and at least two shelf elements which engage oppositely spaced-apart upright members to form a shelving structure. The upright members are made of a latticework of welded wire which is secured at two opposite edges in support beams (corner posts). The shelf elements are also made of a latticework fixed along two opposite edges thereof in support beams. The support beams of the shelf elements have means at each end for engaging the latticework of an upright member. The latticework of the shelf elements is relatively flexible and may require additional structure and rigidity by means of auxiliary support beams positioned under the shelves for this purpose. The formed structure has relatively little strength against rhombic collapse in the X (sideways) direction. Thus, one or more diagonal turnbuckle assemblies are recommended across the rear of the unit to provide added structural integrity to the shelving to prevent rhombic collapse.
A shortcoming of such a prior art modular shelving system is the fabrication expense of the shelves, which require, first, formation of a welded latticework of wires; second, formation of channel beams for the shelf edges; third, formation of hooks on the ends of the channel beams; fourth, crimping of the ends of the wires for insertion into the beam channels; and fifth, crimping of the beam channels to retain the ends of the wires. Thus, formation of each shelf is a multiple-step, multiple-process operation requiring welding, cutting, stamping, forming, and assembling of multiple components.
A further shortcoming is that the resulting shelf is relatively weak against folding in the Y (front-to-back) direction and requires one or more supplementary beams for heavy loads.
A still further shortcoming is that the shelves are open latticework and therefore are useless for storing small items which cannot stand on the latticework and may even fall through, requiring therefore a supplementary continuous shelf liner.
A still further shortcoming is the lack of inherent rhombic stability, requiring addition of one or more diagonal turnbuckles to prevent rhombic collapse under load.
What is needed in the shelving art is an improved modular metal shelving system wherein an entire stand-alone shelving assembly is assemblable without need for any tools; wherein each individual shelf may be readily repositioned at a different height; wherein the shelves may be formed inexpensively; wherein the shelves are continuous and thus can fully support objects of any size; wherein the assembly is inherently strong against rhombic collapse in both the X and Z directions; wherein the assembly may be assembled or disassembled rapidly and easily; and wherein the assembly is readily modular.
It is a primary objective of the invention to provide a shelving assembly which is assemblable without need for any tools, wherein each individual shelf may be readily repositioned at a different height, wherein the shelves may be formed inexpensively, wherein the shelves are continuous and thus can fully support objects of any size, wherein the assembly is inherently strong against rhombic collapse in the X and Z directions, wherein the assembly may be assembled or disassembled rapidly and easily, and wherein the assembly may be readily combined modularly with additional assemblies.
Briefly described, a stand-alone modular shelving system in accordance with the invention comprises at least two vertical support members, each having a front corner post and a rear corner post connected by a welded grid of horizontal and vertical rods. A plurality of shelves formed of sheet metal are disposed between the vertical support members, each shelf including hook elements formed near the corners thereof for engaging and resting on horizontal rods of the grid. A back member extends between the vertical support members and also includes hook elements formed near the corners thereof for engaging and resting on horizontal rods the grid. In a currently-preferred embodiment, the upper corners of the back member each include first and second formed hooks spaced apart by the distance between adjacent horizontal rods and disposed in planes spaced apart by approximately the thickness of the vertical rods. When installed, the first and second hooks rest on adjacent horizontal rods and also straddle a vertical rod. The back member thus provides diagonal bracing through the sheet metal forming the back, preventing rhombic distortion and collapse in the X and Z directions. Additional shelving assemblies may be added modularly by addition of only one vertical support member, as the vertical support members are symmetrical and accessible equally from either side.
The foregoing and other objects, features, and advantages of the invention, as well as presently preferred embodiments thereof, will become more apparent from a reading of the following description in connection with the accompanying drawings in which:
Referring to
The shelf elements 11 and upright members 12 are preferably made of latticework 13 comprising welded steel wire. The latticework 13 of shelf elements 11 is provided with structure and rigidity by means of support beams 14 fixed along prongs of opposite edges 16 thereof (
Support beams 14 of shelf elements 11 are provided at each end thereof with means for engaging upright members 12 so as to form the shelf structure. A hook 26 is formed by providing a slot across the end portion of beam 14 as shown in
The latticework 13 of the upright members 12 is also provided with support beams 31 which are formed to have a channel of C-shaped cross-section 33 so that the prongs of edges 32 can be bent at alternating right angles for insertion into channel 33.
When extra support is needed for storing heavier articles, an auxiliary support beam 40 may be positioned under shelf element 11 for this purpose. When bracing is required to prevent rhombic collapse in the X and Z directions, wire bracing having hooked ends (not shown) can engage the latticework 13 and be tensioned by means of a conventional turnbuckle (not shown).
The shortcomings of prior art shelving assembly 10 are recited hereinabove and need not be repeated here.
Referring to
A plurality of shelves 116 formed of sheet metal as by stamping and punching are disposed between the spaced-apart vertical support members. Each shelf includes a formed skirt 118 extending orthogonally from the plane of the shelf along all four sides to provide flexural rigidity to the shelf. The front and rear skirts 118a,118b are extended to define hook elements 120 formed near the four corner regions of each shelf for engaging and resting on horizontal rods 110 of grid 108. Each hook element 120 includes a slot 122 having a width 124 substantially the same as the diameter of a horizontal rod 110 such that the shelf is fixed in the X direction by engagement of the hooks with horizontal rods. Y direction motion is limited by an adjacent vertical rod.
Because hook elements 120 extend beyond the ends of shelves 116, the shelves are easily installed into and removed from vertical members 102. For installation, a shelf is tilted and inserted between members 102, then a horizontal rod 110 is selected for the location of the shelf. Hook elements 120 at one end of the shelf are inserted through grid 108 above the selected rod in one of members 102, allowing the shelf to be brought to horizontal. Hook elements 120 on the opposite end of the shelf are positioned over the corresponding opposite horizontal rod in opposite member 102, the shelf is translated until slots 122 are positioned over the respective selected rods, and then the shelf is lowered to engage the hook elements onto the rods, thus securing the shelf in place. Disassembly is the reverse of assembly.
Thus, all shelves may be installed and removed in system 100 quickly and easily without resort to tools or separate fasteners. Further, shelves may be positioned at any desired height on members 102. Further, shelves may be formed to provide any desired depth of shelf in the Y direction less than and up to the full width of members 102.
A back member 126 formed of sheet metal as by stamping and punching is disposed between the vertical support members 102. Each back member 126 includes a formed skirt 128 extending orthogonally from the plane of the member along all four sides to provide flexural rigidity to the back member. Back member 126 is extended to define hook elements 130 formed near the four corner regions of each back member for engaging and resting on horizontal rods 110 of grid 108. Each hook element 130 includes a slot 132 having a width 134 substantially the same as the diameter of a horizontal rod 110 such that the back member is fixed in the Z direction by engagement of the hooks with horizontal rods.
In a currently-preferred embodiment, the upper corner regions 136 of back member 126 include first and second formed hooks 130a,130b. Hooks 130a are formed as planar extensions of the sheet stock from which back member 126 is stamped. Hooks 130b are formed by folding from skirts 128a,128b and are spaced apart from hooks 130a by approximately the thickness of a vertical rod 112 (
In a currently preferred embodiment, back member 126 is punched to form one or more arrays 132 of recessed holes 134 for receiving pegboard hangars (not shown) as are known in the prior art.
Back member 126 may be of any desired height up to the full height of vertical support members 102.
Optionally, system 100 may include a kick plate 160 formed as a closed box element having hook elements 162 similar to hook elements 120,130, and a restraining tab 164 extending therefrom for engaging grids 108.
Referring to
Thus, additional shelving is readily provided by simply hooking additional back members and shelves to an existing vertical support element 102 and providing a single additional vertical support element 102′,102″.
From the foregoing description it will be apparent that there has been provided an improved system of shelving. Variations and modifications of the herein described shelving system will undoubtedly suggest themselves to those skilled in this art. Accordingly, the foregoing description should be taken as illustrative and not in a limiting sense.
