EP1030576B1

EP1030576B1 - Extendable shelf assembly

Info

Publication number: EP1030576B1
Application number: EP98954594A
Authority: EP
Inventors: Stephen N. Hardy
Original assignee: RTC Europe Ltd; RTC Industries Inc
Current assignee: RTC Europe Ltd; RTC Industries Inc
Priority date: 1997-11-13
Filing date: 1998-11-13
Publication date: 2002-04-03
Anticipated expiration: 2018-11-13
Also published as: JP3380804B2; BR9815626A; WO1999025220A1; EP1030576A1; DE69804656T2; JP2001522676A; AU732458B2; AU1165099A; DE69804656D1

Description

The present invention relates to an extendable shelf assembly.

Retail store locations, such as drug stores, grocery stores and toy stores, require a large amount of shelving both to store merchandise and to display the merchandise to consumers. The shelving should be inexpensive, easy to install and capable of housing and displaying a large number of items. To satisfy these requirements, may retail store locations use gondola shelving systems. Gondola shelving systems typically employ long metal gondola shelves attached to slotted gondola uprights. These systems can be quickly and inexpensively assembled and are widely used in retail store locations.

In certain environments, it is advantageous if the shelf apparatus slides to an extended position. When in such an extended position, the contents on the shelf may be more easily viewed and accessed. In particular, a shelf apparatus that slides to an extended position allows for more efficient stocking.

Prior art systems have employed standard uncoordinated drawer glides. However, when a shelf on standard drawer glides is moved in or out, "racking" and binding may result. That is, unless an equal pulling force is applied across the longitudinal surface of the shelf, the shelf often extends unevenly, i.e. in a non-perpendicular direction, from the glides and thus becomes jammed in the glides. Therefore, in prior art systems, sliding an extendable shelf has typically required the ues of two hands to prevent the shelf from binding in the glides. In other words, equal pulling force had to be applied to the shelf at two locations or the shelf would become misaligned relative to the system, and the shelf would become jammed.

For example, US-A-5 673 801 discloses a shelf frame which can support a shelf and which can be moved along a pair of extender arms.

According to the present invention there is provided an extendable shelf assembly as claimed in Claim 1 of the appended Claims.

In certain merchandising and stocking situations it may be preferable to lock the shelf assembly in a fully extended or non-extended position. In addition, as the shelf is extended to one of various positions, it is also preferable to lock the shelf assembly in the or each of the extended positions. It additionally desirable to employ a locking apparatus that requires only a single hand to operate.

Preferably, there is provided an extendable shelf assembly as claimed in Claim 2 of the appended Claims.

Further features are set out in Claims 3 et seq.

Further features of prior art shelving systems are explained in US-A-4 934 645, "Shelving Assembly", and US Patent Application Serial Number 08/596,301 (now US Patent 5 738 019), "Adjustable Shelf Assembly for Merchandising Display Stand".

Preferred embodiments of the present invention are described with reference to the following figures:-

FIGURE 1 is a front oblique view of a preferred embodiment of the universal category management shelf system;

FIGURE 2 is an overhead elevational view of the shelf assembly of the embodiment of FIGURE 1;

FIGURE 3 is a side elevational view of the shelf assembly of FIGURE 2 with a position locking mechanism shown in dashed lines in the locked position;

FIGURE 4 is a side elevational view of a similar shelf assembly of FIGURE 3 with the position locking mechanism in the unlocked position;

FIGURE 5 is a rear elevational view of the shelf assembly of FIGURE 2;

FIGURE 6 is a side elevational view of a sprocket used in the invention;

FIGURE 7 is another side elevational view of the sprocket of FIGURE 6;

FIGURE 8 is an overhead elevational view of a position locking mechanism used in the invention;

FIGURE 9 is a side elevational view of the position locking mechanism of FIGURE 8;

FIGURE 10 is a rear elevational view of the position locking mechanism of FIGURE 8;

FIGURE 11 is a front oblique upside down view of the position locking mechanism of FIGURE 8 engaging a slot of an extender arm;

FIGURE 12 is a front elevational view of the position locking mechanism of FIGURE 11;

FIGURE 13 is a front elevational view as in FIGURE 12 depicting a biasing apparatus holding the position locking mechanism in position;

FIGURE 14 is a front elevational view of a back rail used in the invention;

FIGURE 15 is an overhead elevational view of a shelf frame used in the invention;

FIGURE 16 is a front elevational view of the front rail of FIGURE 15;

FIGURE 17 is a side elevational view of a side rail of FIGURE 15;

FIGURE 18 is a side elevational view of a shelf assembly including a divider tilted upwardly at a 17 degree angle;

FIGURE 19 is a side elevational view of the shelf assembly of FIGURE 18 in a level horizontal position;

FIGURE 20 is a side elevational view of the shelf assembly of FIGURE 19 tilted downward at a 17 degree angle;

FIGURE 21 is a close up side elevational view of the embodiment of FIGURE 19;

FIGURE 22 is a close up side elevational view of an embodiment similar to FIGURE 21 including a different divider arrangement;

FIGURE 23 is an overhead elevational view of the shelf assembly of FIGURE 2 with the shelf frame in a retracted or closed position;

FIGURE 24 is an overhead elevational view of the shelf assembly of FIGURE 23 with the shelf frame in a fully open or extended position; and

FIGURE 25 is an overhead elevational view of the shelf assembly of FIGURE 24 with the shelf frame in a partially open or extended position.

Referring to FIGURE 1, a preferred embodiment of a shelf assembly 20 of the present invention includes a back cross rail 22, a side rail 24, a side rail 26 and a front cross rail 70, which together define a shelf frame 25. A gondola bracket 28 connects to a slotted upright or standard 30. Specifically,

tabs

32 and 34 are fitted into slots in the upright 30 as indicated by the dashed lines shown at 36. The upright 30 is typically attached to a back wall 31.

FIGURE 1 shows the shelf frame 25 in a partially extended position. The shelf frame 25 slides along an internal rack arm or extender arm 40 that includes a series of slots 42, 44, 46. A rotating wheel also referred to as a cog or sprocket 50 is attached to the back cross rail 22 via an axle 52. The axle 52 is preferable square.

The sprocket 50 includes teeth, including, for example, a tooth 54. The teeth of the sprocket 50 engage the slots 42, 44, 46 of the extender arm 40 as the shelf frame 25 slides from a partially open position, as shown in FIGURE 1, to a closed position, along the direction shown by the arrow 60. Similarly, the shelf frame 25 may slide to a fully open or extended position by sliding in the direction opposite the arrow 60.

Referring to FIGURE 2, the invention also employs a second sprocket 49, not shown in FIGURE 1, at the opposite end of the axle 52. Preferably, the second sprocket 49 is identical to the first sprocket 50, and includes multiple teeth for

engaging slots

41, 43 of the side rail 26.

Further details of the shelf assembly 20 are also shown in FIGURE 2, which shows the back cross rail 22, the

side cross rails

24,26 and a front cross rail 70, which together define the shelf frame 25. The mounting bracket 28 and a mounting bracket 74 affix the shelf assembly 20 to the slotted uprights (not shown). The sprocket 50 is attached to the axle 52, and

sprocket washers

76, 78 are situated on either side of the sprocket 50 on the axle 52. In a preferred embodiment, the sprocket 50 and

sprocket washers

76, 78 are molded into a single piece from nylon or other suitable material. The shelf frame 25 slides along the extender arm 40 and an extender arm 72.

The use of a first sprocket 50 and second sprocket 49 that engage slots on the cross rails 24, 26 eliminates "racking" and binding when a shelf frame 25 is moved in or out. The teeth of the sprockets engage slots on the cross rails 24, 26 and insure that a pulling or pushing force is evenly applied such that the shelf frame 25 slides in a perpendicular direction to the upright 30 or the back wall 31.

Referring to FIGURE 3, which shows a side elevational view of the shelf assembly of FIGURE 2, a mounting bracket 90 attaches the internal rack arm 40 to the slotted upright (not shown). The sprocket washer 76 helps to couple the sprocket 50 to the axle 52.

FIGURE 3 also illustrates details of a position locking mechanism or locking lever 100 that prevents the shelf frame 25 from sliding along the

extender arms

40, 72. The position locking mechanism 100 includes a tab 102 and extends from the tab 102 to an extension 104 that fits into one of the slots, for example slot 103, on the arm 40. The position locking mechanism 100 is affixed to the side rail 24 by a bolt 106 and washer (not shown) and is rotatable in the direction indicated by

arrows

108, 110 about the bolt 106.

As is discussed in more detail later, the extension 104 is biased, for example by piece of steel (not shown) to extend into the slot 103, preventing the arm 40 from moving forward or backward, thus preventing the shelf frame 25 from sliding along the arm 40. In order to slide the shelf frame 25 forward or backward, a user depresses the tab 102 by applying force with a finger in the direction indicated by the arrow 114. Accordingly, the position locking mechanism 100 rotates about the axis defined by the bolt 106, and the extension 104 slides out of the slot 103, as is shown in FIGURE 4.

The position locking mechanism 100 engages the same slots that the sprocket 50 engages, resulting in multiple locking positions of the shelf frame 25. In other words, the shelf frame 25 may be locked at each position that a tooth of the

sprocket

49, 50 engage the respective slots in the side rails 26, 24.

Because dual sprocket and slot engagement results in the shelf frame 25 sliding evenly along the

rails

24, 26, the invention requires only a single position locking mechanism 100. In other words, the position locking mechanism 100 is only required along one of the side rails 24, 26. In the FIGURES, the single position locking mechanism is only located along the side rail 24, and not along the side rail 26, although the position locking mechanism 100 could also be employed along only the side rail 26 and not along the side rail 24. This implementation reduces the cost of a locking slidable shelf frame.

FIGURE 4 depicts the position locking mechanism 100 in the released position such that the side rail 24 can slide along the arm 40. FIGURE 4 also depicts other alternative forms of the invention including a rotatable mounting bracket 120. Additionally, a stopping device, such as a bolt or other removable barrier 122 and nut (not shown) combination is in a different location than the bolt 106 and nut combination of FIGURE 3. FIGURE 4 also depicts an alternative sprocket 126 affixed to the axle 52.

FIGURE 5 depicts a back view of the sprocket 50 affixed to the axle 52 with

washers

76, 78. The position locking mechanism 100 is shown in dashed lines. FIGURE 5 also shows the back rail 22, the mounting bracket 90, the arm 40 and the side rail 24. The sprocket 50 rotates on the axle 52 between an inner plate 127 and outer plate 129 of the rail 24. A wall 131 of the arm 40 is between the sprocket 50 and the outer plate 129 of the rail 24.

Referring back to FIGURE 3, a stopping device, such as a bolt or nut 99 attached extends from the inside wall 131 of the arm 40. As the shelf frame 25 is extended in the direction of the arrow 97, the nut 99 eventually comes into contact with the sprocket 50, preventing the shelf frame 25 from being extended any further from this fully extended position.

Further details of the sprocket 126 are shown in FIGURE 6 and FIGURE 7. The sprocket 126 includes a series of teeth, including a tooth 130, a tooth 132, a tooth 134 and a square opening 136 that fits around the square axle 52. The sprocket 126 is preferably molded into a single piece from nylon.

Details of the structure and operation of the position locking mechanism 100 are shown in FIGURES 8, 9, 10, 11, 12 and 13. FIGURE 9 shows the position locking mechanism 100, including the tab 102 and the extension 104, from the same perspective as in FIGURE 3 and FIGURE 4. The position locking mechanism 100 is affixed to a side rail by a bolt and nut pair through an opening or hole 140. As explained in more detail later, a biasing apparatus, for example a piece of metal attached to the rail 24 by a bolt, is used to maintain the position locking mechanism in a locked position, that is, engaging one of the slots on the arm 40. The position locking mechanism 100 is preferably made of 14 gauge steel.

Referring to FIGURES 11, 12 and 13 which are upside down views, the position locking mechanism 100 includes a plate 101 and the extension 104 that extends into a slot, for example slot 111 of the arm 40. The extension 104 is maintained within the slot 111 by a biasing apparatus, as shown in FIGURE 13, preferably a soft metal piece 113 that is affixed by a bolt 115 and nut 117 to an inner wall 119 of the rail 24. The metal piece 113 applies a force in the direction indicated by arrow 125, pushing the extension 104 into the slot 111. FIGURE 13 also illustrates a top wall 121 and outer wall 123 of the rail 24.

Referring back to FIGURE 9, as force is applied, for example by a finger, in the direction indicated by the arrow 142 against the surface 144, the extension 104 moves downward in the direction indicated by the arrow 146, disengaging the slot of the arm 40. Referring to FIGURE 13, the extension 104 moves in the direction opposite the arrow 125 so that the extension 104 no longer engages the slot 111 in the arm 40. Thus, the rail 24 may freely slide along the arm 40. Referring again to FIGURE 9, the surface 144 preferably includes a thin layer of a soft spongy material for improved feel and control when the surface is touched by a finger. The invention preferably includes a single position locking mechanism 100 in the shelf assembly 20 to allow for one-handed release of the lever and one handed sliding of the shelf frame 25 along the

arms

40, 72. Two release levers may be employed, for example, to reduce the possibility of accidental unlocking of the position locking mechanism.

Further details of the shelf frame 25 and its components are illustrated in FIGURES 14, 15, 16 and 17. FIGURE 14 shows the back rail 22, FIGURE 16 shows the front rail 70, FIGURE 17 shows the side rail 24, and FIGURE 15 shows the shelf frame 25 including the side rails 24, 26, the front rail 70 and the back rail 22.

Various configurations of the shelf apparatus 20 are shown in FIGURES 18, 19 and 20. FIGURE 18 shows the shelf assembly 20 mounted to the upright 30 and tilted upwardly at a 17 degree angle. FIGURE 19 shows the shelf assembly of FIGURE 18 in a level horizontal position, and FIGURE 20 shows the shelf assembly of FIGURE 19 tilted downward at a 17 degree angle. The different mounting angles depend on the arrangement of a mounting bracket 281.

Sample views of the shelf frame 25 in three different representative positions are shown in FIGURES 23, 24 and 25. FIGURE 23 shows the shelf frame 25 in a retracted or closed position. FIGURE 24 shows the shelf frame 25 in a fully open or extended position. Similarly, FIGURE 25 shows the shelf frame 25 in a partially open or extended position. The shelf frame may also be extended to multiple other positions and is limited only by the frequency of the teeth and slot engagement between the sprockets and the side rails. In addition, the shelf frame 25 is locked by the position locking mechanism 100 in each position.

In a preferred embodiment of the invention, the

rails

22, 24, 26, 70, the arm 40 and the axle 52 are made of steel of various gauges, as one skilled in the art would know.

It is to be understood that alternative forms of the various components of the described embodiments are covered by the full scope of equivalents of the claimed invention. To particularly point out and distinctly claim the subjects regarded as the invention, the following claims conclude this specification.

Claims

An extendable shelf assembly (20) comprising
a first extender bar (40) and a second extender bar (72) which can, in use, be mounted on a first slotted upright (30) and a second slotted upright (30) respectively, characterised by a front rail (70), a back rail (22), a first side rail (24) and a second side rail (26) defining a shelf frame (25) arranged, in use, for supporting a shelf thereon and for movement along said first extender bar (40) and said second extender bar (40),
a first series of slots (42, 44, 46) on said first extender bar (40) and a second series of slots (41, 43) on said second extender bar (72), and by a first rotatable sprocket wheel (50) comprising a first plurality of teeth and a second rotatable sprocket wheel (49) comprising a second plurality of teeth, the first and second wheels (50, 49) being affixed at opposite ends of an axle (52) which extends across said shelf frame (25) and runs parallel to the back rail (22), the arrangement being such that, in use, movement of said shelf frame (25) is facilitated by rotation in unison of said first rotatable sprocket wheel (50) and said second rotatable sprocket wheel (49) traversing said first series of slots (42, 44, 46) and said second series of slots (41, 43) respectively.
An extendable shelf assembly as claimed in Claim 1, further comprising a position locking mechanism (100), in use, affixed to said shelf frame (25), which position locking mechanism (100) comprises a tab (102) and an extension (104) wherein, in use, the extension engages a slot of said first series of slots (42, 44, 46) to inhibit said shelf frame (25) from moving.
An extendable shelf assembly as claimed in Claim 2, further comprising a metal biasing apparatus (113) coupled to the shelf frame (25) wherein, in use, the biasing apparatus (113) urges said extension (104) into engagement with a slot of said series of slots (42, 44, 46).
An extendable shelf assembly as claimed in Claim 1, 2 or 3, further comprising a removable barrier (122) extending from said first extender bar (40) wherein, in use, the removable barrier (122) can engage said first rotatable sprocket wheel (50) to inhibit said shelf frame from sliding off said first extender bar (40) and said second extender bar (72).
An extendable shelf assembly as claimed in Claim 1, 2, 3 or 4, wherein said axle (52) is square in cross-section.
An extendable shelf assembly as claimed in any preceding Claim, wherein said shelf frame (25) is rotatable to a non-horizontal position.
An extendable shelf assembly as claimed in Claim 6, wherein said shelf frame (25) is rotatable to a plurality of non-horizontal positions.
An extendable shelf assembly as claimed in any preceding Claim, further comprising a first bracket (28) and a second bracket (74) for, in use, affixing said first extender bar (40) and said second extender bar (72) to first (30) and second (30) slotted uprights respectively.
A shelving system comprising a pair of slotted uprights (30) having an extendable shelf assembly (20) as claimed in any preceding Claim mounted thereon.