FLUE SPACER
A flue spacer, suitable for providing a flue space in a storage rack, having a transversely extending spacer surface, a first leg extending from a first end of the spacer surface, a first tab extending from the first leg, a second leg extending from a second end of the spacer surface, a second tab extending from the second leg, and at least one resilient member between the first and second tabs. The resilient member is adapted to allow the first and second tabs to be moved towards one another and apply a restoring force to urge the first and second tabs away from one another. The first and second tabs are adapted to attach the spacer surface to at least two storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space within the storage rack.
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The present invention relates generally to spacers that create flue space. More specifically, the present invention relates to spacers that attach to uprights of storage racks to create flue space.
BACKGROUND OF THE INVENTIONStorage racks are widely used in industrial and commercial settings. In these settings, it is desirable to maximize the space offered by these racks. This is accomplished by placing pallets or boxes close to each other, oftentimes such that they occupy the entire shelf space, leaving little or no space between the pallets or boxes. This practice can make the stored boxes or pallets especially susceptible to fire damage.
In a typical setting where storage racks are used, such as a warehouse, smoke detectors and overhead sprinkler systems are commonly employed as fire safety and containment systems. Several factors can affect the effectiveness of these systems. For example, to maximize the effectiveness of the sprinkler system in containing a fire, the fire needs to reach the sprinkler heads as quickly as possible in order to extinguish the fire before it builds up too much heat and intensity. Similarly, the benefits of smoke detectors can best be utilized if smoke triggers the detectors in the early stages of a fire. Additionally, water from the overhead sprinkler system needs to freely flow through the shelves to contain a fire that has broken out at any shelving level and to prevent it from spreading to other storage racks. When stored goods are closely and tightly spaced on a shelf, the effectiveness of the fire safety and containment systems are reduced because smoke cannot rise, fire cannot dissipate, and water cannot freely flow to the fire. This is particularly problematic in storage facilities that store large numbers of boxes because boxes can be packed together to form a relatively tight seal against rising smoke and descending water.
Efforts have been made to address this problem. In certain storage environments, fire codes require the surface area of each shelf to have a certain amount of open area—generally fifty percent of the surface area. These open areas serve two primary purposes. First, the open areas allow a fire that has broken out on a lower rack level to travel upwards and to release heat in the process. Thus, the fire progresses upwards towards overhead sprinklers to activate the sprinklers, rather than laterally through the rack. Second, the open areas of each shelf allow water from the overhead sprinkler system to flow downward to the lower rack levels once the fire has been detected. One system that meets these fire code regulations is described in U.S. Pat. No. 6,401,944 to Kircher et al. entitled “Storage Rack Shelving,” and U.S. Pat. No. 7,156,243 to Henning et al. entitled “Perforated Decking,” which are incorporated herein by reference. Kircher et al. discloses a corrugated deck for use as shelving with a plurality of apertures forming open areas comprising fifty percent of the surface area of each deck.
While the fifty percent open area regulation provides a useful mechanism to address fire safety and containment, some fire codes, such as foreign fire codes, may not require shelves with a fifty percent open area in all storage environments. In some storage environments, a lower percentage of open area may be allowed, while in others, there may be no requirement for open areas in the shelves.
Another system that has been employed to address the fire safety issue in storage racks is the use of vertical flue spaces. Flue spaces are gaps or openings left in the storage rack structure that form a vertical passage that allows fires to spread vertically to the sprinklers and water to flow down to lower rack levels. The sizes and locations of such flue spaces are typically dictated by local or national fire codes, fire protection standards and/or insurance requirements. there are two common types of flue space: “transverse” flue spaces, which are usually located at every rack upright and are perpendicular to the rack rows (i.e., they extend from the front of the shelving space to the back of the shelving space); and “longitudinal” flue spaces, which run parallel to the rack rows, and may be located between back-to-back rows or may even be formed by aisles between the racks. Typical flue spaces are required to be six inches wide, and fire inspectors and codes often allow the space between the rack uprights to form a portion of this width.
While flue spaces are commonly required, they are typically provided by simply stacking the boxes or other stored goods towards one upright, leaving the required flue space at the other end. This is shown in FIGS 1A-1C, which illustrate top and front views of a typical set of storage racks, and an isometric view of a similar storage rack. In FIGS 1A-1B, there are two racks 102, which are positioned back-to-back with an aisle 104 on either side. Each rack 102 includes a number of vertical uprights 106 that support horizontal crossbars 108. As shown in
In addition to transverse flue spaces, the storage racks 102 may have a longitudinal flue space 116 formed between them. In some cases, wires, straps or meshes have been stretched between adjacent rear uprights 106 to prevent boxes or other goods from extending into this longitudinal flue space. Such attempts to maintain the longitudinal flue space have been marginally successful because such devices tend to bend or buckle when boxes are pressed against them.
While the foregoing flue space system is simple and inexpensive, it suffers from a number of problems. Primarily, it is not uncommon for boxes to be positioned to partially or fully obstruct the flue space. Furthermore, even when the boxes are properly stacked, they can deform over time and ultimately lean into, and possibly obstruct, the flue space.
Some efforts have been made to address these problems. One such effort is described in U.S. Pat. No. 5,160,294 to Petter entitled “Spacer Rack for Smoke Detection,” which is incorporated herein by reference. Petter discloses an open wire mesh column that extends from the front to the back of a pallet storage rack to create a vertical passageway through which smoke can travel. However, the Petter system suffers from a number of shortcomings. For example, the Petter system is large and bulky. The size and complexity of the system makes it difficult to implement. In addition, the system must be set up on an empty storage rack. Thus, the Petter system would either have to be set up prior to using the storage rack or after emptying the items already on the storage rack in order to retrofit those racks. Additionally, the Petter system requires the wire mesh columns to penetrate through each shelving layer to form the passageway. Thus, the system would require extensive modification of the storage rack shelves where storage racks with continuous shelves are used.
It is believed that another effort to address the problem with conventional flue spaces provided relatively complex welded crossbars that were mounted to the front face of each front upright (i.e., the surface facing the aisle 104), and the rear face of each rear upright (i.e., the surface facing the longitudinal flue space 116). In addition to being relatively difficult to manufacture, and thus expensive, it is understood that these crossbars were difficult to install on a common rack system, particularly where the rack was already loaded with boxes or other goods.
Therefore a need still exists for an economical and functional flue spacer system that will address the fire safety issue in storage racks and allow retrofitting to filled storage racks.
SUMMARY OF THE INVENTIONIn one aspect, a flue spacer for providing a flue space in a storage rack is provided. The exemplary flue spacer has a transversely extending spacer surface, a first leg extending from a first end of the spacer surface, a first tab extending from the first leg, a second leg extending from a second end of the spacer surface, a second tab extending from the second leg, and at least one resilient member between the first and second tabs. The resilient member is adapted to allow the first and second tabs to be moved towards one another and apply a restoring force to urge the first and second tabs away from one another. The first and second tabs are adapted to attach the spacer surface to at least two storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space within the storage rack.
In another aspect, another flue spacer for providing flue space in a storage rack is provided. The exemplary flue spacer has a transversely extending spacer surface, a first leg extending from a first end of the spacer surface, a first tab associated with the first leg such that it is movable relative to the spacer surface and adapted to engage a first storage rack upright, a second leg extending from a second end of the spacer surface, a second tab associated with the second leg and adapted to engage a second storage rack upright, and at least one resilient member between the first tab and the spacer surface. The resilient member is adapted to allow the first tab to be moved towards the second tab, and to apply a restoring force to urge the first tab away from the second tab. The first and second tabs are adapted to attach the spacer surface to the first and second storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space within the storage rack.
In another aspect, a shelving system is provided. The exemplary shelving system has at least two storage rack uprights, at least one shelf suspended on the storage rack uprights, and a flue spacer. The flue spacer has a transversely extending spacer surface, a first leg extending from a first end of the spacer surface, a first tab associated with the first leg, a second leg extending from a second end of the spacer surface, a second tab associated with the second leg, and at least one resilient member between the first and second tabs. The resilient member is adapted to allow the first and second tabs to be moved towards one another and apply a restoring force to urge the first and second tabs away from one another. The first and second tabs are adapted to attach the spacer surface to the storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space adjacent the shelf,
The foregoing aspects are exemplary only, and not intended to limit the claimed invention. Other variations on the foregoing will be apparent to one of ordinary skill in the art after studying the present disclosure and practicing the inventions described herein.
Embodiments of the invention are described in the following exemplary drawing figures:
The present invention provides a system for providing flue spaces in storage racks. Because a typical storage facility can contain hundreds of storage racks, one preferred embodiment of the invention is simple to install, inexpensive to manufacture, and does not consume a large portion of the valuable storage space. In addition, the preferred embodiment preferably can be easily retrofitted into existing storage racks that already are filled with items. While it is most preferred for embodiments of the present invention to satisfy one or more of these objectives, it will be understood that this is not strictly necessary of all embodiments of the invention, and the statement of these objectives is not intended to limit the claimed invention in any way.
Referring now to
As noted above, the flue spacer 200 may be made with any suitable shape. To this end, the spacer 200 may be formed, cast, or assembled in any known manner. One preferred way to form the spacer of
Embodiments of the present invention may be assembled or attached to storage racks in any suitable manner. In a preferred embodiment, such as the embodiment of
The foregoing embodiment is preferred when the shelves are not already filled with boxes or other stored goods because, at that time, an installer can relatively easily attach both legs 204 to the storage rack uprights 106. This embodiment might, however, be somewhat more difficult to install when the shelves are already filled or partially-filled. As such, another embodiment of the invention replaces one of the holes 206 with a remotely-installable attachment device that can be firmly attached to the back upright 106 from a distance.
Examples of remotely-installable attachment devices are shown in
Any suitable tab shape may be used. In the embodiment of
Additional and alternative shapes and sizes of tabs may be provided to fit into standard support openings, as will be appreciated by persons of ordinary skill in the art in view of the present disclosure. In one preferred embodiment, tabs 906 are provided with flue spacers as an adapter kit for installing the flue spacer in tight spaces or on shelves that already have boxes stored on them.
The tabs 900, 902 and 1000 attach the spacer 200 to the rack upright 106 by sliding into corresponding holes therein. These tabs are particularly useful for retrofitting storage racks that already have items stored on the shelves because an installer can simply reach the flue spacer back behind the stored goods and slide the tabs into holes in the uprights to secure the back of the flue spacer, all without having to remove the goods or climb into the shelf space. Once the rear tab is inserted, the installer can attach the front spacer leg using a fastener, hook, tab, or other attachment device.
Referring now to
Referring now to
A number of variations on the foregoing embodiment will be apparent to those of ordinary skill in the art in view of the present disclosure. For example, the spring 1208 may be replaced by a turnbuckle or other axial positioning device that is manually expanded to lock the tabs 1206 into their respective holes. The telescoping members 1202a, 1202b may also be replaced by adjacent sliding members or a linkage (such as a trapezoidal 4-bar linkage). These and other variations are included in the present invention.
A further variation of a spring-loaded flue spacer is illustrated in
A number of variations on the foregoing embodiment are envisioned and will be apparent with practice of the present invention and upon review of the present disclosure. For example, spring-loaded tabs may be provided on both ends of the flue spacer, or other kinds of spring (or other resilient material, such as elastomer), may be used. The spring arrangement also may be modified. For example, the leg may be provided as a spring-loaded member that pivots relative to the spacer surface. This embodiment may use a mechanical pivot between the leg and the spacer surface in conjunction with a spring that biases the leg into the engaged position, or the spacer surface itself may be flexible enough to act as a spring. In the latter case, the user can install the flue spacer by inserting the rear tab into a rear vertical support hole, flexing the support surface to fix the front tabs into a front vertical support hole, and releasing the flue spacer to lock it into place.
It should be understood that the foregoing embodiments are exemplary only, and other embodiments will be apparent to those of ordinary skill in the art in light of the teachings provided herein. For example, any type of fastening mechanism may be used to install the spacers, and the spacers can take any suitable shape. Spacers may be installed in any suitable pattern to obtain the desired flue space volume, and may be made larger or smaller, or attached with shims, to provide smaller or larger flue spaces, if necessary or desired. Also, the spacers may be installed by attaching them to the shelves or horizontal or angled rack elements, rather than the uprights. The claimed invention is limited only by the following claims.
Claims
1. A flue spacer for providing a flue space in a storage rack, the flue spacer comprising:
- a transversely extending spacer surface;
- a first leg extending from a first end of the spacer surface;
- a first tab extending from the first leg;
- a second leg extending from a second end of the spacer surface;
- a second tab extending from the second leg;
- at least one resilient member provided between the first and second tabs, the resilient member being adapted to allow the first and second tabs to be moved towards one another and apply a restoring force to urge the first and second tabs away from one another;
- wherein the first and second tabs are adapted to attach the spacer surface to at least two storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space within the storage rack.
2. The flue spacer of claim 1, wherein the spacer surface comprises a tubular rod, and the first and second legs comprise bent and flattened end portions of the tubular rod.
3. The flue spacer of claim 1, wherein the spacer surface comprises a generally linear surface.
4. The flue spacer of claim 3, wherein the generally linear surface has a circular profile.
5. The flue spacer of claim 1, wherein the first tab is slidably attached to the first leg, and the resilient member comprises a spring connecting the first tab to the first leg.
6. The flue spacer of claim 1, wherein the spacer surface comprises a first member and a second member telescopically positioned within the first member, and the resilient member comprises a spring positioned between the first member and the second member.
7. (canceled)
8. A flue spacer for providing a flue space in a storage rack, the flue spacer comprising:
- a transversely extending spacer surface;
- a first leg extending from a first end of the spacer surface;
- a first tab associated with the first leg such that it is movable relative to the spacer surface, the first tab being adapted to engage a first storage rack upright;
- a second leg extending from a second end of the spacer surface;
- a second tab associated with the second leg, the second tab being adapted to engage a second storage rack upright;
- at least one resilient member provided between the first tab and the spacer surface, the resilient member being adapted to allow the first tab to be moved towards the second tab, and to apply a restoring force to urge the first tab away from the second tab; and
- wherein the first and second tabs are adapted to attach the spacer surface to the first and second storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space within the storage rack.
9. The flue spacer of claim 8, wherein the spacer surface comprises a tubular rod, and the first and second legs comprise bent and flattened end portions of the tubular rod.
10. The flue spacer of claim 8, wherein the spacer surface comprises a generally linear surface.
11. The flue spacer of claim 10, wherein the generally linear surface has a circular profile.
12. The flue spacer of claim 8, wherein the first tab is slidably attached to the first leg, and the resilient member comprises a spring connecting the first tab to the first leg.
13. The flue spacer of claim 12, wherein the first tab comprises a sleeve that slidably fits over a flattened end portion of the first leg, and the spring is connected to the sleeve at a first end of the spring, and to the flattened end portion of the first leg at a second end of the spring.
14. (canceled)
15. A shelving system comprising:
- at least two storage rack uprights;
- at least one shelf suspended on the storage rack uprights; and
- a flue spacer comprising: a transversely extending spacer surface, a first leg extending from a first end of the spacer surface, a first tab associated with the first leg, a second leg extending from a second end of the spacer surface, a second tab associated with the second leg, and at least one resilient member provided between the first and second tabs, the resilient member being adapted to allow the first and second tabs to be moved towards one another and apply a restoring force to urge the first and second tabs away from one another, wherein the first and second tabs are adapted to attach the spacer surface to the at least two storage rack uprights such that the spacer surface is offset from the storage rack uprights to form a vertical flue space adjacent the at least one shelf.
16. The flue spacer of claim 15, wherein the spacer surface comprises a tubular rod, and the first and second legs comprise bent and flattened end portions of the tubular rod.
17. The flue spacer of claim 15, wherein the spacer surface comprises a generally linear surface.
18. The flue spacer of claim 15, wherein the first tab is slidably attached to the first leg, and the resilient member comprises a spring connecting the first tab to the first leg.
19. The flue spacer of claim 15, wherein the spacer surface comprises a first member and a second member telescopically positioned within the first member, and the resilient member comprises a spring positioned between the first member and the second member.
20. (canceled)
Type: Application
Filed: May 14, 2007
Publication Date: Oct 2, 2008
Applicant:
Inventor: Gary Thomas Smith (Suffolk, VA)
Application Number: 11/748,230
International Classification: A47F 5/01 (20060101);