U.S. patent number 3,870,266 [Application Number 05/367,745] was granted by the patent office on 1975-03-11 for self-locking shelf support.
This patent grant is currently assigned to P.X. Industries, Inc.. Invention is credited to Paul M. MacDonald.
United States Patent |
3,870,266 |
MacDonald |
March 11, 1975 |
SELF-LOCKING SHELF SUPPORT
Abstract
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.
Inventors: |
MacDonald; Paul M. (North
Abington, MA) |
Assignee: |
P.X. Industries, Inc.
(Rockland, MA)
|
Family
ID: |
23448430 |
Appl.
No.: |
05/367,745 |
Filed: |
June 7, 1973 |
Current U.S.
Class: |
248/235 |
Current CPC
Class: |
A47B
96/063 (20130101); A47B 96/027 (20130101) |
Current International
Class: |
A47B
96/06 (20060101); A47b 096/06 () |
Field of
Search: |
;248/235,250,223 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Schultz; William H.
Attorney, Agent or Firm: Morse, Altman, Oates &
Bello
Claims
Having thus described the invention what I claim and desire to
obtain by Letters Patent of the United States is:
1. A self-locking shelf support, comprising
a. a plate formed with a lip extending perpendicularly from the
front face thereof,
b. a plug fixed to said plate in spaced parallel relation to said
lip and above said lip and extending perpendicularly from the rear
face of said plate for mounting said support to a cooperating
socket in an upright cabinet wall and the like,
c. said plug being formed with a chamber open at the front face of
said plate and closed at the rear of said plug,
d. a pin retractably mounted for limited axial movement in said
chamber parallel to said plug, and,
e. resilient means engaging said pin and normally urging said pin
to a position extending perpendicularly from the front face of said
plate in spaced parallel relation to said lip, said pin adapted to
be temporarily retracted into said chamber by axial pressure
applied to the outer end thereof.
2. A self-locking shelf support according to claim 1 wherein said
means includes a coil spring mounted in said chamber between said
pin and an end wall of said plug.
3. A self-locking shelf support according to claim 2 wherein said
plate is L-shaped stamped from sheet metal.
Description
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
customer's 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. 3,471,112 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 10 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 11/4inches 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 removed from its socket 38 and placed in
another socket where the shelf may be re-installed.
* * * * *