U.S. patent number 3,580,535 [Application Number 05/031,583] was granted by the patent office on 1971-05-25 for connecting fixture.
This patent grant is currently assigned to WHB-Anbaumobel von Poschinger K.G.. Invention is credited to Christoph Naske.
United States Patent |
3,580,535 |
Naske |
May 25, 1971 |
CONNECTING FIXTURE
Abstract
A two-piece fixture for connecting two shelf parts or the like
at right angles to each other consisting of a headed locking pin
projecting from one side of one shelf part, and a cup-shaped
slotted element to be mounted in one end of the other shelf part
and adapted to be hooked laterally over the headed projecting part
of the locking pin and to draw the two shelf parts tightly
together. The largest part of the periphery of the cup-shaped
element has a double wall, while the remaining part is formed by a
single thicker wall which is flat at its outer side and provided
with an axially extending slot which has an open end at the open
side of the cup. The inner wall surface at least of this
single-wall portion is inclined, tapering from the open end of the
slot toward its closed end.
Inventors: |
Naske; Christoph (Froschhausen,
DT) |
Assignee: |
WHB-Anbaumobel von Poschinger
K.G. (Murnau, DT)
|
Family
ID: |
6601680 |
Appl.
No.: |
05/031,583 |
Filed: |
April 24, 1970 |
Foreign Application Priority Data
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Apr 24, 1969 [DT] |
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G6916620.7 |
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Current U.S.
Class: |
248/239; 108/107;
248/225.11 |
Current CPC
Class: |
F16B
12/2009 (20130101); F16B 12/2036 (20130101); F16B
2012/2018 (20130101); F16B 2012/106 (20130101) |
Current International
Class: |
F16B
12/00 (20060101); F16B 12/20 (20060101); A47g
029/02 () |
Field of
Search: |
;248/223,224,235,250,245,244,246,239 ;108/109,110,108,107,15
;211/134,135,146,148A,153 ;312/245 ;287/2.92D,2.92J,20.926 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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157,213 |
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Jun 1954 |
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AU |
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370,567 |
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Apr 1932 |
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GB |
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Primary Examiner: Frazier; Roy D.
Assistant Examiner: Foss; J. Franklin
Claims
Having thus fully disclosed my invention, what I claim is:
1. A two-piece fixture for connecting two boards of a shelf or the
like at right angles to each other comprising a substantially
cup-shaped connecting element adapted to be mounted in a blind-end
bore in a first of said boards adjacent to one end thereof and
having a substantially round outer wall and a flat part on said
wall adapted to abut against one side of the second board, said
element further having an inner wall concentric to said outer wall
and having a closed bottom at one end and an open other end, said
two walls being integrally connected to each other adjacent to said
other end of said element and being separated from each other by a
chamber having a round substantially U-shaped cross section and an
open end outwardly adjacent to said bottom and a closed end
adjacent to said connected end of said walls, said chamber
terminating in its peripheral direction into a single thicker wall
portion having said flat part on its outer side, said wall portion
having a central slot extending in the axial direction of said
element and having an open end adjacent to the open end of said
inner wall and a closed end adjacent to said bottom, at least the
inner surface of said thicker wall portion directly adjacent to
both walls of said slot being tapered from said open end to said
closed end of said slot so that at least adjacent to said slot said
wall portion gradually increases in thickness from said open end to
said closed end of said slot, said fixture further comprising a
locking pin having a shank adapted to be mounted in a transverse
bore in said second board, and a thinner stud on one end of and
coaxial to said shank and adapted to project from said side of said
second board and having a head on its free end, said stud having a
thickness substantially equal to the width of said slot and being
adapted to be inserted into said slot, and said head having a
thickness not larger than that of said shank but larger than the
width of said slot and being adapted to engage upon said tapered
inner surface when said stud in inserted into said slot.
2. A two-piece fixture as defined in claim 1, in which the entire
inner wall surface of said element is conical and tapering from
said open side of said inner wall to said bottom thereof.
3. A two-piece fixture as defined in claim 1, in which said shank
of said locking pin has a tapped bore in its other end and a screw
screwed into said bore and having a head adapted to abut against
the other side of said second board.
4. A two-piece fixture as defined in claim 1, in which said shank
of said locking pin has a tapped bore in its other end, and a screw
screwed into said bore and having an annular flange adapted to abut
against the other side of said second board, a head on the outer
end of said screw, and a shank part intermediate said head and said
flange, said shank part and said screw head being adapted to serve
the same functions as said stud and its head for connecting another
board by means of another cup-shaped connecting element to said
other side of said second board.
Description
The present invention relates to a fixture for connecting two
boards, preferably of wood, for example, of a shelf or the like, at
right angles to each other, which consists of a cup-shaped element,
preferably of plastic, which is adapted to be inserted into a
blind-end bore in one board and the outer peripheral surface of
which is provided with a flat portion and a slot in this portion,
and of a locking pin or the like which has a shank inserted in and
secured to a bore in the other shelf part and a headed end which
projects from this other shelf part and has a maximum diameter
equal to or smaller than the shank. When the cup-shaped element and
the locking pin are clamped together, the projecting head of the
pin is located at the hollow inside of this element.
There is a known fixture of this kind in which the inner wall of
the cup-shaped element is cylindrical and eccentrically offset
relative to the cylindrical outer wall. A second cup-shaped member,
preferably of metal is inserted into the outer element and provided
with a slot which extends in the peripheral direction. Due to the
eccentricity of the inner wall relative to the outer wall of the
outer cup-shaped element, the distance between the inner wall and
the outer wall increases in the peripheral direction of the slot so
that, when the metallic member is turned relative to the outer
element, the projecting head of the lockin pin will be tightened
against the outer element. The outer wall of the outer element of
this known fixture is also provided with axially extending
projections of a relatively low height for locking this element in
a blind-end bore of the respective shelf part merely by pressing it
into this bore.
It is an object of the present invention to provide a connecting
fixture of the type as described above which omits entirely the
metallic member which previously had to be provided in the outer
cup-shaped element, but still permits this cup-shaped element not
only to be properly secured in one shelf part but also to be
tightly clamped to a locking pin which is secured to another shelf
part, even if the latter differs slightly from its prescribed
thickness.
For attaining this object, the present invention provides a single
cup-shaped element which has an inner wall concentric to its outer
wall, and is provided with a gap intermediate the inner and outer
walls which is open at the bottom side of the cup and closed at the
open side of the latter where the inner and outer walls are secured
to each other and an outwardly projecting rim is provided. This gap
between the two walls extends in the peripheral direction of the
cup-shaped element to points near the two sides of the slot which
extends in the axial direction of the element through the thicker
remaining wall portion, the outer side of which is preferably
flattened. The inner wall surface at least of this thicker wall
portion at both sides of the slot tapers from the open end of the
slot at the open end of the cup toward the closed end of the slot
near the bottom of the cup so that this slotted wall portion
gradually increases in thickness from the open to the closed end of
the slot. Thus, when the end surface of the shelf part containing
the cup-shaped element is placed in engagement with the side of the
other shelf part from which the locking pin projects and the shelf
parts are shifted relative to each other in the direction of the
slot through which the locking pin then projects, the head of the
locking pin will slide along the tapered inner wall surfaces at
both sides of the slot until the two shelf parts are clamped
tightly together. Like the known connecting element as previously
described, the cup-shaped element according to the invention may be
simply pressed into a blind-end bore in one shelf part or the like,
and it has the advantage that, due to the provision of the gap
between its outer and inner walls, it possesses a certain
resilience so that, when it is pressed into a blind-end bore of the
proper diameter in one shelf part, it will be firmly secured
therein. Since the inner wall surfaces at both sides of the slot
along which the head of the locking pin slides when the two shelf
parts are being connected to each other are tapered from the open
end of the slot at the open side of the cup toward the closed end
of the slot adjacent to the bottom of the cup, minor deviations
from the prescribed thickness of the shelf part carrying the
locking pin will also be compensated by the taper of the mentioned
wall surfaces.
Instead of merely making the parts of the inner wall surface of the
cup-shaped element of a tapering shape along which the head of the
locking pin is slidable, it is advisable to make the entire inner
wall surface of this element of a conical shape since it may then
be more easily manufactured.
The features and advantages of the present invention will become
further apparent from the following detailed description thereof
which is to be read with reference to the accompanying drawings, in
which:
FIG. 1 shows a perspective view of an inverted cup-shaped
connecting element according to the invention;
FIG. 2 shows a horizontal section of a vertical shelf part to which
a locking pin is secured together with a bottom view of a
connecting element according to FIG. 1, as seen in the direction of
the arrow C in FIG. 3;
FIG. 3 shows a vertical section which is taken along the line A--B
in FIG. 2 of the connection between a vertical and a horizontal
shelf part by means of the two parts of the fixture according to
the invention;
FIG. 4 shows a horizontal section of a vertical shelf part together
with a top view of the connecting element according to FIG. 1, as
seen in the direction of the arrow D in FIG. 3;
FIG. 5 shows a front view of the connecting element, as seen in the
direction of the arrow E in FIG. 3;
FIG. 6 shows a vertical section of a vertical shelf part containing
a locking pin consisting of two parts; while
FIG. 7 shows a vertical section of a vertical shelf part containing
a locking pin which likewise consists of two parts but permits a
second horizontal shelf board to be connected thereto.
As illustrated in the drawings, the connecting element 1 according
to the invention has a substantially inverted cup shape like other
fixtures of this type as previously known and it comprises a
conical inner wall 7 which is integrally connected at the open end
of the fitting to a substantially cylindrical outer wall 8, an
outwardly projecting rim 2 on this open end of the cup, and a
bottom 3 on the other end of the inner wall 7. The two walls 7 and
8 are further integrally combined at one lateral side into a single
wall the outer side of which is provided with a flat surface 4 and
a slot 5 in this surface which extends in the axial direction of
the cup and through the thicker single wall portion to the inner
surface of the inner wall 7. Slot 5 has an open end at the open end
of the cup and a closed, preferably rounded end adjacent to the
inner surface of the bottom 3. Since the inner wall 7 tapers in the
direction toward the bottom 3, the cross-sectional size of the
walls of slot 5 gradually increases from its open end toward its
closed end. The inner and outer walls 7 and 8 are separated by a
chamber 9 of a substantially U-shaped or horseshoelike cross
section which is open at the bottom side of the cup and closed at
the open side of the cup adjacent to the rim 2 and terminates in
the peripheral direction of the cup at a certain distance from the
two walls of slot 5.
The connecting element 1 is to be inserted into a blind-end bore in
a horizontal shelf part 10, for example, a wooden shelf board, by
being pressed into the same, and due to its chamber 9 its outer
wall 8 will then be resiliently compressed so as to lock the
connecting element 1 in a fixed position within this bore. If
desired, the outer surface of the outer wall 8 may be additionally
provided with longitudinally extending riblike serrations 11 or the
like, as shown at one part of the outer wall 8 in FIG. 1. These
serrations 11 are preferably provided in the form of at least two
groups.
This connecting element 1 is operatively associated with a locking
pin 13 the shank part of which is to be secured in a bore 16 in a
vertical shelf part, for example, another wooden board 12, and has
a head 14 at one end which engages upon an outer surface of the
shelf part 12, while on its other end it has a stud projecting from
the opposite surface of the shelf part 12. This stud has a head 15
of a diameter equal to or smaller than the diameter of the shank of
the locking pin 13 in the bore 16 of the shelf part 12.
Intermediate this head 15 and the shank of pin 13, the projecting
stud has a part 17 of a reduced diameter of a thickness
substantially equal to the width of slot 5 so that, when pin 13 is
mounted in the shelf part 12 and the other shelf part 10 containing
the fitting 1 is moved downwardly so that the open end of slot 5
passes over the reduced stud portion 17, the walls of the slots
will slide along the stud portion 17, while the head 15 overlaps
the inner edges of the slot walls and its inner side adjacent to
the reduced stud part 17 engages with the upwardly tapered inner
surface of the thicker single wall portion at both sides of slot 5.
By means of these tapered inner wall portions directly adjacent to
both sides of slot 5 in fitting 1 it is possible to compensate for
minor variations in the prescribed thickness of the vertical shelf
part 12 and to draw the end surface of the horizontal shelf part 10
tightly against the side of the vertical shelf part 12.
FIG. 3 illustrates a modification of the locking pin 18, in which
the head 14 of the pin as shown in FIG. 1 is provided with a
studlike projection 19 which is similar to that on the other end of
the pin, as previously described and permits a further shelf part
(not shown) similar to the part 10 to be connected to the other
side of the shelf part 12 by means of another connecting element 1
which is mounted in this further shelf part in the same manner as
previously described.
As illustrated in FIGS. 6 and 7, the locking pin may also consist
of two parts. The head of the locking pin 20 according to FIG. 6
may consist of the head of a screw 21 which is screwed into a
tapped bore in pin 20, while when a further horizontal shelf part
(not shown) is to be connected to the side of the vertical shelf
part 12 opposite to the side carrying the shelf part 10, screw 21
may be replaced by another screw 23, as shown in FIG. 7, which is
provided with a flange which engages upon the outer side of the
shelf part 12, while the head of this screw 23 is adapted to serve
the same function as the head 15 for connecting the further
horizontal shelf part by means of another connecting element 1 to
the vertical shelf part 12.
Although my invention has been illustrated and described with
reference to the preferred embodiments thereof, I wish to have it
understood that it is in no way limited to the details of such
embodiments but is capable of numerous modifications within the
scope of the appended claims.
* * * * *