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Publication numberUS3870266 A
Publication typeGrant
Publication dateMar 11, 1975
Filing dateJun 7, 1973
Priority dateJun 7, 1973
Publication numberUS 3870266 A, US 3870266A, US-A-3870266, US3870266 A, US3870266A
InventorsPaul M Macdonald
Original AssigneePx Ind Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Self-locking shelf support
US 3870266 A
An L-shaped shelf bracket is provided with a rearwardly extending fixed plug adapted to be mounted in a cooperating socket formed in the side of a cabinet wall. The plug is formed with an axial chamber closed at the rearward end and open at the forward end to receive a spring and pin mounted for reciprocation therein. The pin is adapted to be forced fully back into the chamber when retracted against the force of the spring and to extend outwardly parallel to the upper surface of a shelf placed on the lower leg of the L-shaped bracket in order to lock the shelf in position against vertical displacement. The device may be attached to any socket in a cabinet wall so that a shelf may be adjusted as to height. The retractable pin holds the shelf in place during and after shipment.
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Claims  available in
Description  (OCR text may contain errors)

States atem [1 1 o ilnite [111 3,870,266

MacDonald Mar. 11, 1975 SELF-LOCKING SHELF SUPPORT Primarv Examiner-William H. Schultz 75 Ivet PalM.M D ld,N th I 1 n n or Ablzngtony iz gf or glltfgney. Agent. or Firm-Morse, Altman. Oates & [73] Assignee: P.X. Industries, Inc., Rockland,

Mass 57 ABSTRACT [22] Wed: June 1973 An L-shaped shelf bracket is provided with a rear- [21] Appl. N0.: 367,745 wardly extending fixed plug adapted to be mounted in a cooperating socket formed in the side of a cabinet wall. The plug is formed with an axial chamber closed [22;] :LSIII. 248l23g5i72b4g/62gg at the rearward end and Open at the forward end to qi 250 receive a spring and pin mounted for reciprocation 1 0 earc l therein. The pin is adapted to be forced fully back into 56 R f d the chamber when retracted against the force of the l e erences lte spring and to extend outwardly parallel to the upper UNITED STATES PATENTS surface of a shelf placed on the lower leg of the L- 883323 3/1908 Macduff 248/250 shaped bracket in order to lock the shelf in position 9 5 12/1933 Parker 248/250 against vertical displacement. The device may be atg g tached to any socket in a cabinet wall so that a shelf mp enso" may be adjusted as to height. The retractable pin 3 47l,i MacDonald X holds th shelf i p a ng nd after shipment.

FOREIGN PATENTS OR APPLICATIONS 3 Claims, 3 Drawing Figures 389.197 6/1965 Switzerland 248/235 PATENTEUHARI 1 1s 3,870,266

I do

SELF -LOCKING SHELF SUPPORT BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates generally to cabinet hardware and more particularly is directed towards a new and improved shelf support bracket having a self-locking mechanism for restraining a shelf against displacement.

2. Description of the Prior Art In the manufacture of various types of cabinets or similar products which incorporate shelves, it is a desirable feature to fabricate the cabinet so that any shelves involved may be adjusted to different heights whereby the customer may set the shelf height to his own particular needs. This feature is normally adhieved by a drilling rather shallow sockets vertically along opposing side walls of the cabinet and inserting small posts into the sockets with the other ends of the posts projecting from the wall so as to support the ends of a shelf placed thereon. The height of the shelf is changed by removing the plug and replacing it in a socket at a different level. While this type of shelf support is satisfactory for installed units, it is unsatisfactory for use during shipment since the shelves are not held against vertical displacement and may easily tumble about inside a cabinet possibly damaging or marring the cabinet. For this reason, shelves are normally packaged and shipped separately from the cabinet for installation at the customers site. This practice is also unsatisfactory since the shelves and cabinets may not arrive at the same time and often times the shelves will become lost during shipment.

In U.S. Pat. No. 3,471,1l2 dated Oct. 7, 1969 and entitled Combination Self Support & Anchor there is disclosed a shelf bracket which locks the top and bottom edges of the shelf so as to permit the shelf to be shipped installed without becoming loose. It is an object of the present invention to provide improvements over the shelf lock disclosure in the foregoing patent and to provide an adjustable, self-locking shelf support particularly useful for mounting heavy shelves.

SUMMARY OF THE INVENTION This invention features a self-locking adjustable shelf support, comprising an L-shaped bracket formed with a rearwardly extending plug or peg on one leg thereof adapted to be mounted in a cooperating socket formed in the side wall of a cabinet. The plug is formed with an axial chamber and a spring-loaded pin is mounted in the chamber adapted to telescope into the plug when retracted and snap out into a locking position over the end of a shelf mounted on another leg of the bracket.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view in perspective of a self-locking shelf support made according to the invention,

FIG. 2 is a view in front elevation thereof, and,

FIG. 3 is a sectional side view showing the device in locking position with a shelf.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings the reference character generally indicates a self-locking device for mounting a shelf 12 to a wall 14. The device is particularly useful for mounting shelves to a selected height position in cabinets, bookcases or similar structures,


especially those in which the shelf 12 is relatively heavy.

In the preferred form of the invention the device 10 is generally organized about an L-shaped bracket 16 having a flat body portion 18 and a perpendicularly extending flat lip or leg 20 extending from the lower edge thereof. The bracket piece preferably is stamped from steel or the like to provide strength and rigidity sufficient to support a heavy load. Typical dimensions of the bracket include a body length of perhaps llainches and a leg length of perhaps one-half inch. These dimensions are only by way of example and obviously a wide variety of sizes may be employed depending upon the particular application.

Fixed securely to the body portion 18 is a pin or plug 22 located perhaps one inch up from the lip 20. In the illustrated embodiment, the plug 22 is of a cylindrical configuration terminating in a conical tip at its outer end and formed with a reduced neck 24 which projects through a circular opening 26 in the wall of the flat body portion 18. The neck is fitted tightly to the body 18 and this may be done by a variety of techniques such as press fitting, welding or the like. The outer end of the neck 24 terminates substantially flush with the forward face of the body portion 18. The plug 22 is formed with an axial recess 28 open at the left-hand end thereof as viewed in FIG. 3 and closed at the right-hand end thereof. Preferably, the passage 28 is cylindrical and terminates at its left-hand end with a slight restriction 30 which cooperates with an annular rib 32 formed on the pin or plunger 34 mounted for reciprocation in the passage 28. The pin 34 preferably is cylindrical and is normally urged into the extended position of FIG. 3 by means of a coil spring 36 mounted in the passage compressed between the right-hand end of the pin and the back wall of the passage. The shank of the pin 34 has a length such that when fully retracted the outer end will be substantially flush with the outer face of the body 18. Typically, the shank will project perhaps a one-fourth inch out from the body face when fully extended. Here again, the dimension is only by way of example and may be varied according to requirements.

In the use of the device, the wall 14, whether it be a cabinet, bookcase or the like, is formed with a socket 38 having a diameter substantially equal to the outside diameter of the plug 22 and having a depth at least equal to the length of the plug. If the shelf is to be made adjustable, a number of socket holes 28 may be drilled in a vertical row along the wall 14. Generally, these holes are drilled in horizontal pairs so that two shelf brackets may be employed at each end of the shelf. A similar set of sockets is drilled in the opposite wall'to receive other brackets for the opposite end of the shelf. With the sockets formed in the wall, the devices 10 are mounted in pairs at the same level in opposite walls, preferably two devices for each end of the shelf. The shelf 12 is then mounted by depressing the pin 34 so that it retracts fully into the passage 28. The shelf is then dropped down to rest on the lip 20 and the pin is released to snap out into a locking position over the top of the shelf 12. This effectively locks the shelf at top and bottom against vertical displacement so that a shelf may be installed in the cabinet, for example, by the manufacturer and shipped in place without fear of the shelf becoming loose. The shelf is easily removed in order to change the height by merely depressing the pin 34 and lifting the shelf clear. The device may then be 3 4 removed from its socket 38 and placed in another d. a pin retractably mounted for limited axial movesocket where the shelf may be re-installed. ment in said chamber parallel to said plug, and,

Having thus described the invention what I claim and e. resilient means engaging said pin and normally desire to obtain by Letters Patent of the United States urging said pin to a position extending perpendicuis: 5 larly from the front face of said plate in spaced parl. A self-locking shelf support, comprising allel relation to said lip, said pin adapted to be tema. a plate formed with a lip extending perpendicularly porarily retracted into said chamber by axial presfrom the front face thereof, sure applied to the outer end thereof.

b. a plug fixed to said plate in spaced parallel relation 2. A self-locking shelf support according to claim 1 to said lip and above said lip and extending perpenwherein said means includes a coil spring mounted in dicularly from the rear face of said plate for mountsaid chamber between said pin and an end wall of said ing said support to a cooperating socket in an upplug.

right cabinet wall and the like, 3. A self-locking shelf support according to claim 2 c. said plug being formed with a chamber open at the wherein said plate is L-shaped stamped from sheet front face of said plate and closed at the rear of said metal.


Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US883323 *Nov 25, 1907Mar 31, 1908James Bruce MacduffBracket.
US1939408 *Jan 3, 1933Dec 12, 1933Charles Parker CompanyShelf bracket
US2570731 *Jun 6, 1949Oct 9, 1951Susnow Saul HCornice bracket
US3245181 *Aug 7, 1961Apr 12, 1966Lloyd G StephensonAnchor plate for posts
US3471112 *Nov 21, 1967Oct 7, 1969Px Ind IncCombination shelf support and anchor
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3981475 *Jan 16, 1975Sep 21, 1976Champion International CorporationShelf anchoring clip
US4053132 *Aug 5, 1976Oct 11, 1977James Anthony Del PozzoShelf support
US4666117 *Oct 9, 1985May 19, 1987P.X. Industries, Inc.Low profile shelf lock
US4732358 *Jul 22, 1987Mar 22, 1988Hughes Supply Co. Of Thomasville, Inc.Shelf bracket
US4819901 *Jun 27, 1988Apr 11, 1989P. X. Industries, Inc.Metal shelf lock
US4830323 *Apr 19, 1988May 16, 1989Titus Tool Co., Ltd.Shelf support
US4856746 *Oct 24, 1988Aug 15, 1989Lsi Corporation Of America, Inc.Interchangeable shelf support bracket
US5642675 *Jun 28, 1995Jul 1, 1997Webb; William T.Propped knockdown furniture
US6866316May 23, 2003Mar 15, 2005Durakon Acquisition Corp.Frame to vehicle cargo area mounting
US6986488 *Feb 2, 2004Jan 17, 2006Agostino Ferrari S.P.A.Disappearing device for shelf support in furniture
DE3030264A1 *Aug 9, 1980Feb 18, 1982Ernst HopfShelf base support system - includes plug-in pin mounted on centre piece support also fitted with two clamping pins supporting shelf base between them
U.S. Classification248/235
International ClassificationA47B96/06
Cooperative ClassificationA47B96/027, A47B96/063
European ClassificationA47B96/06C
Legal Events
May 26, 1992ASAssignment
Effective date: 19920331
May 26, 1992AS02Assignment of assignor's interest
Owner name: P.X. INDUSTRIES, INC.
Effective date: 19920331