U.S. patent number 3,706,105 [Application Number 05/087,268] was granted by the patent office on 1972-12-19 for portable play platform.
Invention is credited to Joseph L. Loomis, Winslow C. Nicholas.
United States Patent |
3,706,105 |
Nicholas , et al. |
December 19, 1972 |
PORTABLE PLAY PLATFORM
Abstract
This invention is a portable play platform which may be attached
or detached to commercially available children's playpens or cribs,
giving the child a playing surface to play upon while the child is
standing. In general, the device is comprised of a playing surface
member usually mounted on the top of the playpen or crib by a
bracket attached to the bottom thereof. An adjustable hook-like
compression member attached to the playing surface member clamps
the upper portion of the playpen against the bracket and a broad
torque reaction bar secured between the brackets adjacent to the
playpen bears against the playpen thus securing the device rigidly
into position. Bolts with wing nuts may be provided to tighten the
compression member so as to hold the bracket, and compression
member rigidly against the playing surface member.
Inventors: |
Nicholas; Winslow C. (State
College, PA), Loomis; Joseph L. (Pennsylvania Furnace,
PA) |
Family
ID: |
22204142 |
Appl.
No.: |
05/087,268 |
Filed: |
November 5, 1970 |
Current U.S.
Class: |
5/93.1; 248/236;
211/88.01 |
Current CPC
Class: |
A47D
13/06 (20130101) |
Current International
Class: |
A47D
13/06 (20060101); A47D 13/00 (20060101); A47D
15/00 (20060101); A47d 007/00 () |
Field of
Search: |
;5/93,332 ;108/46,47
;211/86,88,90 ;248/235,238,241,236 ;182/120 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Nunberg; Casmir A.
Assistant Examiner: Marquette; Darrell
Claims
I claim:
1. A portable play platform adapted for attachment to a child's
playpen having a railing thereon, comprising in combination:
a playing surface member, having a guidance groove in the lower
portion thereof, said guidance groove being approximately
perpendicular to said railing;
a compression member positioned within said groove, said
compression member having a smooth hook-like end portion thereon
adapted to grasp said railing and having longitudinal slots
therethrough;
a right angled bracket positioned adjacent to said compression
member having holes therethrough, said right angled bracket
comprised of a single vertical and single horizontal member and
said vertical member being bendably adjustable relative to said
playpen at an acute angle to the vertical;
screws extending through said playing surface member, said slots
and said holes in said horizontal member;
wing nuts screwably positioned upon said screws adapted to clamp
said playing surface member, said compression member and said
bracket;
a wide surface torque reaction member attached to the end portion
of said bracket vertical member;
whereby said play platform attaches to said playpen.
2. The combination as claimed in claim 1, having two brackets and a
single wide surface torque reaction member integrally attached to
each of said brackets.
3. The combination as claimed in claim 2, in which the sides of
said play platform are comprised of a yieldable material, said
adjustable brackets being bent to force said torque reaction member
against said yieldable material, whereby said playing surface
member is supported in a horizontal position.
4. The combination as claimed in claim 3, in which said yieldable
material is netting.
5. The combination as claimed in claim 4, in which said brackets
bend toward said playpen at an acute angle to the vertical, said
angle being between 10.degree. and 60.degree..
Description
This invention relates to portable shelves and in particular to
portable shelves which may be secured to a child's playpen or the
like.
Children like to stand to play. When children are free to move
about in unrestricted areas, little is needed to occupy their
attention and interest. However, when in enclosed areas,
specifically playpens or cribs, there is no flat surface on which
to place toys and play while the child is standing. The only flat
surface which is available while in a crib is the mattress, and in
a playpen, its floor or pad. To use these surfaces for play, the
child must sit. If standing the only surface is the upper railing
around the crib or playpen, usually somewhat rounded and only about
three-fourths of a inch wide.
This unique invention provides a portable easily yet firmly mounted
flat playing surface which can be attached to the crib or playpen.
It provides the child with a flat hard surface to place and play
with toys while standing. It is provided with a railing so that
toys will not easily fall to the floor outside of the crib or
playpen. The playing surface is outside of the play area proper and
thus can not be bumped into while playing in the playpen. It
encourages the child to stand while giving him some support in
standing, thus helping to develop balance and standing skills.
Although a child's playpen is referred to throughout this
Specification and Claims, it is to be understood that the invention
is equally applicable to a child's crib or any other infant
enclosure. Hence the word "playpen" is meant to designate any child
enclosure.
An object of this invention is to provide a portable playing
surface that can be attached to a child's crib or playpen.
Another object of this invention is to provide a horizontal playing
surface having a railing so that the child's toys will not easily
fall to the floor.
Still another object of this invention is to provide a play surface
which will encourage a child to stand while playing.
Yet another object of this invention is to provide a portable
platform having suitable dimensions so that it may be clamped upon
most existing child playpens or cribs.
It is still another object of this invention to provide for a
portable playing surface that may be clamped upon a child's playpen
or crib having a net, cloth or other movable slide surface.
Yet another object of this invention is to provide a playing
surface located outside of the playpen area to avoid bumping by the
child.
Another object of this invention is to provide a portable play
platform which may be fabricated from wood, metal, plastic or other
like materials.
These and other objects of the invention are more fully described
and particularly pointed out in the following Specification and
Drawings.
In the accompanying drawings:
FIG. 1 is a perspective view of a playpen, containing an infant, on
which the present invention has been installed;
FIG. 2 is an exploded view of the invention of FIG. 1 showing each
of the component parts of the invention;
FIG. 3 is a view taken in the direction of arrows 3--3 in FIG.
1.
FIG. 4 is a sectional side view similar to that of FIG. 3 of the
present invention modified to fit upon a playpen having sides of
flexible netting.
Referring to the drawings in which like parts are designated by
numerals throughout the several views, 10 represents a conventional
child's playpen having vertical rungs 12 comprising the sides
thereof, on the top of which is mounted railing 14 which is the
uppermost member of the playpen 10. Although the sides of playpen
10 are here shown as being comprised of rungs 12, it may also be
comprised of a netting (shown in FIG. 4) cloth material, or other
fabrics. In many playpens having yieldable fabrics, the sides there
are rigid members which support the upper railing (which supports
the netting). In this case the rigid side members may serve the
same function as rungs 12 in conventional playpens.
The invention attached to the playpen 10 is comprised of a
horizontal playing surface member 16 having vertical back railings
18 and side railings 20 vertically mounted thereon on the edge of
the playing surface member 16. A bite railing 19 comprised of
plastic-like material is mounted on the front edge of the playing
surface member 16 to protect infants' teeth should they bite. These
railings 18 and 20 are screwed to playing surface member 16 by
means of wood screws 21 to prevent toys or other objects resting on
the playing surface member 16 from falling on the floor. Playing
surface member 16 rests upon two compression members 22, slots 24
therethrough and a hook-like end portion 26 which bears against the
railing 14. Playing surface member 16 has two parallel grooves 25
on the bottom surface, shaped to retain compression member 22 in a
sliding relationship. Compression member 22 rests upon brackets 28
which are bent to a right angle. Brackets 28, and compression
member 22 are retained to playing surface member 16 by means of
bolts 30 which extend through playing surface member 16, slots 24
and brackets 28. Wing nuts 32 which may be hand tightened are
screwed onto bolts 30 to clamp playing surface member 16,
compression member 22 and bracket 28 together. It should be noted
that compression member 22 can slide horizontally within the
confines of slots 24 to allow hook-like end 26 to clamp railing
14.
A torque reaction bar 34 is secured to the portion of brackets 28
by means of cap nuts and bolts 36. Cap nuts and bolts 36 are
designed to have no sharp edges which might cut infants' hands.
Torque reaction bar 34 bears against a rigid side of the playpen,
in this case rungs 12 in a horizontal direction to secure brackets
28 in position.
Torque reaction bar 34 is relatively broad and extends and is
secured between two brackets 28. The distance between the center
line of brackets 28 is critical insofar as the ability of the
invention to fit upon the numerous makes and models of commercial
playpens. The dimension found most satisfactory was 183/8 inches.
Likewise the dimension of the hook-like portion of compression
member 22 is critical insofar as attachment is concerned. The
inside vertical dimension of this hook most satisfactory was 11/4
inch.
Referring now to FIG. 4, the invention may also be used upon
playpens having netting, cloth or yieldable sides. Here netting 40
is attached to tubular railing 42 which serves the same purpose as
railing 14. Netting 40 extends completely around the playpen 10
(not shown) and is attached to the floor thereof (not shown) as is
well known in the art. It is frequently necessary to bend the
portion of brackets 28 having torque reaction bar 34 inwardly
toward the netting 40, when the device is mounted on playpens
having sides of netting or yieldable fabric. When the invention is
mounted upon a playpen with sides of netting 40, the netting 40 is
pressed inwardly by the torque reaction bar 34 until sufficient
resistance is offered to the torque reaction bar 34 to support the
device. The angle that the brackets 28 must be bent depends on the
tension of the netting. It has been found that angles from
10.degree. - 60.degree. to the vertical are sufficient for most net
playpens. The brackets 28 may be bent by hand or by using a simple
tool till the proper angle for the particular net playpen is found
so that the playing surface member 16 remains approximately
horizontal. As may be seen, torque reaction bar 34 must have a
large area to bear against a large area of the flexible netting 40
to seek support.
In operation, wing nuts 32 are loosened so as to allow compression
member 22 to slide easily within slot 24 in a horizontal direction.
To install the invention upon the playpen 10, compression member 22
is set on top of railing 14 and hook-like end portion 26 pressed
inwardly so as to engage and compress railing 14 or netting 40.
Torque reaction bar 34 bears horizontally inward against rungs 12
or netting 40 thus supporting the invention in a rigid position
with playing surface member 16 parallel to the ground. Wing nut 32
is then tightened to bear against bracket 28 securing compression
member 22, bracket 28 and playing surface member 16 rigidly
together. Railing 14 is thus securely clamped. As may be noted the
invention may be simply and easily removed from playpen 10 and
placed upon another crib or playpen by reversing the instructions
previously given.
Although the playing surface member 16, side and back railings 18
and 20 and compression member 22 are described and shown as being
constructed of wood, it is within the contemplation of this
invention that metal, plastic, or other substances may be used and
might be molded in a single unit. Likewise the brackets 28 and
compression member 22 may be constructed of material other than
metal without departing from the invention's contemplation.
Although the invention has been described as attachable to a
playpen, it is within the contemplation of the invention that it be
attached to cribs or any other playing area utilized by children.
Thus as may be seen the invention presents a simple, easily
mountable and most practical playing surface used by children in
their infant years.
Although the invention has been described with specificity, it is
understood that various modifications may be made without departing
from the spirit of the invention.
* * * * *