CA1218033A

CA1218033A - Shelf support

Info

Publication number: CA1218033A
Application number: CA000461455A
Authority: CA
Inventors: Timothy J.H. Nicholson; Andrew L. Lee; Clifford Roberts
Original assignee: CLIFFHANGER MARKETING Ltd
Current assignee: CLIFFHANGER MARKETING Ltd
Priority date: 1983-09-30
Filing date: 1984-08-21
Publication date: 1987-02-17
Also published as: AU3149884A; AU556477B2

Abstract

ABSTRACT

In a shelf support formed as a continuous section and capable of supporting a shelf as a cantilever by the cooperation of: a supporting member to lie below and in contact with said shelf, said supporting member being disposed upon a plate for fixing to a wall; and a retaining member to lie above and in contact with said shelf, said retaining member being disposed upon said plate; the improvement comprising, locating a region of said retaining member, spaced from said plate, closer to said supporting member than a region of said retaining member adjacent said plate and providing a ramp surface to urge the retaining member upwards, whereby the shelf is gripped between the supporting member and the retaining member and wherein the supporting member is in contact with the shelf at at least a first location and at least a second location, said second location being closer to said plate than said first location.

Description

The present invention relates to an elongate shelf support for supporting a rectangular section shelf and holding it as a cantilever, the shelf support being formed as a length to run at least part of the length of the rear portion of the shelf, and having support means disposed to engage the rear portion only of the underside of the shelf and retaining means disposed to 10 engage the rear portion of the top of the shelf, whereby the shelf can be frictionally engaged between the support surface and the retaining surface. Normally, there will be parts of the support which extend respectively up above the retaining surface and down 15 below the support surface, to give bracing against an upright surface such as a wall when the shelf support is mounted thereon.

GB 2 05~ 6~6B discloses a shelf support of thls general type. In practice, the shelf support functions very 20 well provided the thickness of the shelf is within-fairly fine tolerances. However, it is found expensive to maintain fine tolerances in manufacture, and if , ~ .

custolners use thei.r own shelving, the shelviny is often outside the re~uired -tolerances~ ~t is thexe~o~e desirable to improve the shelf support so that i-t can accept shelving of greater thickness tolerances.
According to the present invention tnere is provided a shelf support for engaging a rea~ portion of a rectangular section sheIf having an underside and a top, and holding said shelf as a cantilever, said shelf support being formed as a leng-th whereby it can extend along a substantial part of the length of a rear portion of said shelf, said shelf support comprising mounting means for mounting said shelf support on an upright surface, said mounting means having a rear suxface for engaging said upriyht surface support means carried by said mounting means and comprising first and second support parts a-t substantially the same level for engaging a rear portion of said underside of said shelf, said second support part being spaced behind said first support part whereby said second support part is nearer said mounting means rear surface than is said first support part and retaining means carried by sai.d mounting means for engaging a rear portion of said top of said shelf, said retaining means having a lowermost retaining part which extends downwards with respect to the top of the shelf when the shelf is held in position by the shelf supportl and which is spaced above said first and second support parts and positioned nearer said mounting means rear surface than said first support 2cl part but further from s~id mounting means re~r surface than said second support ~art, said retaininy part beiny movable upwards ~ith respect to said support means by the application of only substantial vertical upwards force to said retaining part, said retaininy means and said support means defining a gap for receiving and frictionally engaging said rear portion of said shelf, whereby when the shelf is inserted, the upwards force applied by the top of the shelf to said retaining part causes said retaining par-t to move upwardly with respec-t to said support means.
In accordance with the present invention the forward edge of -the retaining means is suitably the lowest part of the retaining means, and the support means has a dip below the forward edge oE the re-taining means, to enable the rear of the shelf to be engaged beneath the forward edge of the retaining means with the front of the shelf slightlv raised, prior -to pushing the shelf home.
By arranging that the forward edge of the retaining means is the lowest part of the re-taining means, and by providing the dip in the suppor-t means below the forward edge of the retaining means, or the equivalent of such a dip, a somewhat thicker shelf can be inserted between the dip and the forward edge of the retaining means by slightly lifting the forward edge of -the shelf, for instance throuyh about 5; once the shelf has been inserted, it can be pushed firmly home, the

2:b extra thickness being taken up by the forward edge of the retaining means flexing upwards and possibly the forward edge of ~he retaining means biting slightly into the shelf: also, if a detent is provided on the support means, the detent may bite further into the underside of the shelf. For instance, in this way, it is found that a shelf support which is designed for a 15 mm thick shelf can comfortably accept 15.5 mm ~hick or even 16 mm thick shelves.

The invention is further described, by way of example, with reference to the accompanying drawings, in lO which _ Figure 1 is an exploded, isometric view of a first shelf support of the invention together with two end pieces:

Figure 2 is a vertical section along the plane II-II
15 in Figure 1, on a smaller scale. showing the insertion of a shelf; and Figure 3 is a vertical section through a second shelf support of the invention.

Fi~ures 1 and 2 As shown in Figure 2, an elongate, continuous

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section shelf suppor~ 1 is of unitary construction and is of uniform cross-section throughout. The shelf support 1 has a braced, roughly ho~izontal support means in the form of a member defining a support surface 2 which has the following zones, going from front to rear: a front lip 3, a horizontal zone 4, a curved transition zone 5, a dip zone 6, a ramp OI wedge zone 7 (acting as wedge means) providing a wedge surface inclined at a small angle to the horizontal, a small lO downwards step 8 and a horizontal rearmost zone 9. The transition zone 5 fo~ms a smooth curve between the horizontal zone 4 and the dip zone 6. The rearmost zone 9 is below the level of the rear end or edge of the wedge zone 7, which is in turn at the same level as the 15 front lip 3. The dip and wedge zones 6,7 meet at a large ob~use angle and form a dip, the angles of the zones to the horizontal preferably being respectively 5 and 11. In effect, the support surface 2 provides spaced first and second support locations or parts (lip 20 3 and the rear edge of the wedge zone 7~ at the same level.

The shelf support 1 also has retaining means in the form of a member defining a roughly horizontal retaining surface 10 which is inclined forwards and downwaIds so 25 that its downwardly extending forward part or edge part 11 is its lowest part. The retaining surface 10 is preferably substantially parallel to the rear zone 7, , and may be for instance inclined at 10 to the horizontal.

The vartical distance between the edge part 11 and the front end of the wedge zone 7 is greater than the 5 vertical distance between the edge par~ 11 and the rear end of the wedge zone 7 or the lip 3.

The support 1 has mounting means in the form of a rear plate 12 which has a rear surface for abutting against an upright surface 13 such as wall, and is rebated at 14 to improve seating against an irregular surface. The grooves 15 are for metal saving. but the groove 16 imparts some flexibility at the junction of ~he retaining surface 10 and rear plate 12. The rear plate 1~ carries the support means and the retaining lS means.

The support 1 can be screwed in position, and a small loca~ing groove 17 is provided for drilling ~he screw holes. ~hen in position~ the lowest part of the rear plate 12 and the top of an upward extension 18 give 20 bracing against the surface 13, preventing the ga~
between the support surface 2 and the retaining surface 10 being opened up excessively iE a large weight is carried by the shelf 19.

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The support surface 2 and the retaining surface 10 define a gap for receiving the rear portion of a shelf.
As shown, a slightly over-thickness rectangular section shelf 19 can be inserted with its forward edge sligh~ly raised; as its rear bottom edge will be beneath the level of the horizontal upper zone 4 of the support surface 2, the thickness of the shelf 19 can be slightly above that specified. When the shelf 19 is pushed firmly home. the retaining surface 10 will flex slightly 10 u~wards to accommodate the extra thickness of the shelf 19. When this occurs, the top of the extension 18 may bite in~o the surface 13 and/or may slide up the surface 13, possibly with some dishiny of the extension 18: ~hus the edge part 11 is movable upwards by the application 15 of a substantial vertical force. The wedging action applies strong forces; an upwards force applied to the edge part 11 has a relatively large lever arm on the join between the retaining surfaces 10 and the rear plate 12. In addi~ion ~o the movement of ~he edge part 20 11, the step 8 may bite further into the underside of the shelf 19. The sh01f 19 will be gripped or frictionally engaged between the support surface 2 and the retaining surface 10 and locked in position hy the step 8 which acts as a retaining detent or barb. The 25 front lip 3 may very slightly indent the underside of the shelf 19 when pressure is applied to the top of the shelf 19. The lip 3 provides a narrow support zone and avoids difficulties that could be caused by small irregulari~ies on the underside of the shelf 19. The suppor~ 1 is designed so that the shelf 19 assumes a roughly horizontal position. In position, the rear of the shelf 19 will be against the rear plate 12. In theory at least, only the forward edge part 11 of the retaining surface 10 is necessary, unless very severe loads are applied; however, the rear part of the retaining surface 10 determines an upper limit to the l0thiCkneS5 of the shelf 19, when the whole of the surface 10 is flush against the top of the shelf 19. The resistance of the edge part 11 is sufficient to support normal loads, and in practice ~he main purpose of the bracing extension 18 is to prevent the re~aining surface 15 ~o flexing upwards significantly if the front of the shelf 19 is raised (when the lever arm on the edge part ll would be greater).

As shown in Figure 1, decorative plastics-ma~erial end pieces 20 can be provided for push-fitting into the 20 ends of the shelf support 1.

General dimensions of the shelf support 1 and shelf

4 and material or alternative materials for their construction can be as in GB 2 053 666B, which also gives other useful information. Pre-ferably, the shelf 25 support 1 is extruded from aluminium or plastics material or rolled rom sheet metal strip. The SUppOlt surface 2 will normally project from the rear plate 12 less than 50% or less than 30~ of the shelf width, and may project as little as about 10% of the shelf width.

5 The support 1 will normally have a length of 300 mm or greater, i.e. a substantial extent along the rear of the shelf 19.

Fiaure 3 Figure 3 illustra~es four modifications any or all of 10 which can be made to the shelf support.

According to a first modification, a second wedge zone 20 is provided to the rear of the first wedge zone 7, behind the step 8, the second wedge zone 20 terminating in a step 21. The rear edge of the second wedge zone 20 l5 is higher than that of the first wedge zone 7, but the front lip 3 is raised so as to be at the same level as the rear edge of the second wedge zone 20. The retaining surface 10 is also higher so that the vertical distance between the front lip 3 and the edge part 11 is 20 the same as in Figure 2. It i5 found in this way that rather thicker shelves can be accommoda~ed; the barb formed by the rear edge of the second wedge zone 20 digs in further, but only the very rear part of the shelf need be pushed past it.

~ccording to a second modification, a small protrusion or barb 22 is provided in the wedge zone 7. This serves a purpose earticularly when the shelf is long. One end can be pushed in beyond the small barb 22 and temporarily held while the other end is inserted -without the small barb 22, special care has to be taken to stop the first end corning out ~hen the second end is inserted.

According to a third modification, the rearmost zone 9 10 can have a slight inclination, say about 5, forwards and upwards.

According to a fourth modification, an elongate, uniform and continuous section insert 23 can be engaged under the retaining surface l0. The insert 23 has a rib 24 15 which engages in the respective ~roove 15. In effect, the underside of the insert 23 acts as the new retaining surface and a thinner shelf can be accommoda~ed.

As a fifth modification (not illustrated), the support surface could be flat and horizontal, the wedge surface 20 being on the ront part of the retaining member whose underside would slope forwards and upwards from its lowermost part (ll).

As a sixth modification (not illustrated), the rear edge of the first wadge zone 7 (Figure 2) OI of the second 25 wedge zone 20 (Figure 3) can be arranged to bend over or ~;2~

break off when an extra-thick shelf is inserted, thus allowing the shelf to be accommodated.

As a seventh modification (not illustrated), the shelf support could be formed as a casting sr injection moulding. The support surface 2 as well as the inclined bracing member therebelow, the retaining surface 10 as well as the inclined upward extension 18,and the part of the rear plate 12 which forms the back of the gap between the support and retaining surfaces 2,10 remain 10 as of uniform section throughout, but the upper and lower parts of the rear plate 12 are aeertured to receive mould cores or die pieces, and the support surface 2 and retaining surface 10 are supported by respective triangular vertical webs formed between the 15 apertures.

As an eighth modification (not illustrated), the shelf support i6 in short lengths connected together by plugs which engage in the ends of each of two abutting lengths.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:-

1. A shelf support for engaging a rear portion of a rectangular section shelf having an underside and a top, and holding said shelf as a cantilever, said shelf support being formed as a length whereby it can extend along a substantial part of the length of a rear portion of said shelf, said shelf support comprising mounting means for mounting said shelf support on an upright surface, said mounting means having a rear surface for engaging said upright surface; support means carried by said mounting means and comprising first and second support parts at substantially the same level for engaging a rear portion of said underside of said shelf, said second support part being spaced behind said first support part whereby said second support part is nearer said mounting means rear surface than is said first support part; and retaining means carried by said mounting means for engaging a rear portion of said top of said shelf, said retaining means having a lowermost retaining part which extends downwards with respect to the top of the shelf when the shelf is held is position by the shelf support, and which is spaced above said first and second support parts and positions nearer said mounting means rear surface than said second support part, said retaining part being movable upwards with respect to said support means by the application of only substantial vertical upwards force to said retaining part, said retaining means and said support means defining a gap for receiving and frictionally engaging said rear portion of said shelf, whereby when the shelf is inserted, the upwards force applied by the top of the shelf to said retaining part causes said retaining part to move upwardly with respect to said support means.

2. The shelf support of Claim 1, wherein said retaining means comprises a retaining surface inclined forwards and downwards at a small angle to the top of the shelf when the shelf is held in position by the shelf support.

3. The shelf support of Claim 2, wherein said retain-ing surface is inclined at an angle of about 10° to the top of the shelf when the shelf is held in position by the shelf support.

4. The shelf support of Claim 1, 2 or 3, and further comprising wedge means having a wedge surface inclined at a small angle to the underside of the shelf when the shelf is held in position by the shelf support, for engagement by the rear portion of the shelf, the vertical distance between the end of said wedging surface which is furthest from said mounting means rear surface and the opposite side of said gap being greater than the vertical distance between said retaining part and said first support part or said second support part, whereby when said shelf is pushed generally horizontally towards said upright surface, wedging action of said wedge surface causes said retaining part to move upwardly with respect to said support means.

5. The shelf support of Claim 1, wherein, between said first and second support parts, there is a dip defined by a dip zone and said wedge surface, both said dip zone and said wedge surface being defined on said support means and meeting at a large obtuse angle, said dip zone being inclined forwards and upwards at a small angle to the underside of the shelf when the shelf is held in position by the shelf support and said wedge surface being inclined forwards and downwards at a small angle to the underside of the shelf when the shelf is held in position by the shelf support.

6. The shelf support of Claim 1, 2. or 5, wherein said wedge surface is inclined at an angle of about 10° to the underside of the shelf when the shelf is held in position by the shelf support.

7. The shelf support of Claim 5, wherein said dip zone is inclined at an angle of about 5° to the underside of the shelf when the shelf is held in position by the shelf support.

8. The shelf support of Claim 5 or 7, wherein said support means defines the following zones, going from front to rear: a horizontal zone forming said first support part, a curved section transition zone, said dip zone, and a wedge zone forming said wedge surface, said transition zone forming a smooth curve between said horizontal zone and said wedge zone, and the rear edge portion of said wedge zone forming said second support part.

9. The shelf support of Claim 5 or 7, wherein said wedge surface terminates in a step spaced from the rear of said support means, the said support means defining a rearmost part spaced below the level of the rear edge of said wedge surface.

10. The shelf support of Claim 1, 2 or 5, wherein there is a small portrusion on the wedge surface, for providing temporary retention of a partly inserted shelf.

11. The shelf support of Claim 1, 2 or 5, wherein said support means and said retaining means are formed as a continuous section of substantially uniform cross-section throughout.

12. The shelf support of Claim 1, 2 or 5, and formed as continuous section of substantially uniform cross-section throughout.

13. The shelf support of Claim 1, 2 or 3 wherein, when the shelf is held in position by the shelf support, the underside of the shelf is horizontal.

14. The shelf support of Claim 1, 2 or 3 wherein, when the shelf is held in position by the shelf support, the top of the shelf is horizontal.

15. In a shelf support formed as a continuous section and capable of supporting a shelf as a cantilever by the cooperation of: a supporting member to lie below and in contact with said shelf, said supporting member being disposed upon a plate for fixing to a wall: and a retaining member to lie above and in contact with said shelf, said retaining member being disposed upon said plate; the improvement comprising, locating a region of said retaining member, spaced from said plate, closer to said supporting member than a region of said retaining member adjacent said plate and providing a ramp surface to urge the retaining member upwards, whereby the shelf is gripped between the supporting member and the retaining member, and the supporting member is in contact with the shelf at at least a first location and at least a second location, said second location being closer to said plate than said first location.

16. The shelf support of Claim 15, wherein there is a small protrusion on the ramp surface, for providing temporary retention of a partly inserted shelf.