Note: Descriptions are shown in the official language in which they were submitted.
104930Z
This invention relates to a plug for mounting either a solid or a
hollow blind frame, or the like, particularly at a position spaced from a
wall, and comprising a sleeve, adapted to expand inside a bore in the wall and
to project from its surface and a mounting screw or the like adapted to be
inserted into the sleeve.
Plugs of the prior art used for the mounting of a blind frame or a
hollow body, have a number of shortcomings. With a prior plug of this kind
the spacing between the body to be mounted and the wall is altered during the
insertion of the fastening screw. Moreover, the connection between the body
and the plug is problematical. Finally, the prior art plugs are cumbersome
to insert and a post-mounting adjustment of the spacing from the wall is
often necessary.
The present invention is thus concerned with a plug which can be
inserted in an easy and sufficiently accurate fashion and which affords a
good connection between wall and plug on the one hand and between plug and
mounted body on the other hand.
According to the present invention there is provided a plug for
mounting a blind frame or the like on a wall at a position spaced from the
wall, the plug comprising: a plug body in the form of a sleeve with an inner
end adapted to be anchored to a wall and an outer end adapted to be fixed to
the frame or the like, said outer end including a diametrical slot dividing
the outer end into two outwardly divergent portions that are resiliently
movable towards one another so as to enable passage of the plug through a hole
that is smaller than the maximum diameter of the outer end, each outer end
portion having a stepped configuration providing an outwardly facing abutment
and a guide projection extending outwardly beyond the abutment such that the
abutment may engage behind an inner face of a frame to be mounted with the
guide projections extending into a hole therein; and an anchoring screw ex-
tending through the plug body for anchoring the inner end to a wall and a
frame to the outer end.
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104930Z
A plug of this kind may be inserted into the wall through a blind
frame, with the anchoring screw substantially introduced into the sleeve
so that the frame will be kept in position between screw head and the abut-
ments.
The opening in the sleeve will, at its outer expansible portion,
advantageously correspond in compressed condition to at least the outer
diameter of the anchoring screw. This ensures good rotatability of the
screw, even after the plug has been inserted into a blind frame, or the
like. This further permits the plug with the screw in substantially inserted
position to be pushed either into or through the mounting frame.
In the accompanying drawings which illustrate an exemplary embodi-
ment of the present invention:
Figure 1 is a partially cross-sectional view of a plug in opera-
tional
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position with a hollow body attached;
E:igure 2 shows the plug illustrated in Figure 1 with a wooden blind
frame attached,
Figure 3 is a longitudinal cross-section of the outer spreading sec-
tion of a plug with an inserted screw, partially inserted into a fluid frame;
Figure 4 shows the spread-open outer section of the plug secured to
a blind frame; and
Figure 5 is an end view of the insertable end of the plug with part
of the tongues spread out.
A plug 1 (Figure 1) includes a sleeve 2 having at its outer and in-
ner ends expansible portions 3 and 4. An expanding body 7 provided with an
inner thread 6 is adapted to be drawn into the inner end portion 4 by means of
a fastening screw 5. This inner end portion 4 is provided with tongues 8 and
9 which are of different lengths and adapted to be radially spread. The ex-
panding body 7 has axially offset sloping cam faces 10 and 11 which cooperate
with the tongues 8 and 9 respectively.
In the present embodiment two spreading sections, formed by tongues
8 and 9 respectively, are provided in the inner expansible portion 4, in that
there are three longer tongues 8 and three shorter tongues 9 alternately dis-
posed around portion 4, This results in an axially longer expansible portion
4 which affords a good anchoring in a wall bore 12.
The sloping faces 10 and 11 on the expanding body 7 are constructed
in conformance with the different lengths of tongues 8 and 9 and are disposed
in axially staggered fashion so that the tongues are spread open at approxi-
mately the same time as the expanding body is drawn into portion 4.
The faces 10 for the longer tongues 8 are disposed in an otherwise
cylindrical section of the expanding body 7, This cylindrical section extends,
at that end of the body 7 which in operational position is remote from the
inner end 16, into the sloping faces 11 for shorter tongues 9. The groove-
like recesses 15, in which the longer tongues 8 engage, prevent any rotation
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1049302
of the body as it is drawn into the sleeve 2 by the fastening screw 5.
The drawing of the body 7 into the sleeve 2 of the plug is facili-
tated by providing the sloping faces 10 and 11 at the outer ends thereof with
guide projections extending below the tongues 8 and 9 of sleeve 2 in their ini-
tial position.
Figure 5 shows an end elevation of the inner expansible portion 4
and tongues 8 and 9 projecting radially from the outer circumference of the
conical body 7.
The aforedescribed configuration of the inner expansible portion 4
provides a good securing of the plug 1 in a bore 12 in a wall, in that even in
unfavourable walls 17, i.e. those having hollow spaces, the axially elongate
expansible portion formed by means of the offset disposed tongues 8 and 9
guarantee sufficient anchoring. Moreover, a substantial advantage is offered
in that the plug 1, once it has been inserted into bore 12, does not change
its position when the screw 5 is threaded in. This is of particular importance
in the case of either a blind frame or a hollow body 19 to be mounted at a
position spaced from the wall. Any post-mounting adjustment in such a case
would be cumbersome and time-consuming (Figure 2).
Outer expansible portion 3 is designed to facilitate a simple push-
in type of assembly. In relaxed, expanded position two spreadable tongues 20,
separated from one another by means of two wedge-shaped axial slots 21 (Figure
4) extend radially slightly beyond the outer circumference of the sleeve 2.
When the expansible portion 3 is pushed through an aperture in a hollow body
25 or the like (Figure 3), the diameter of which aperture approximates that of
the sleeve 2, the expansible portion 3 becomes compressed. The rotatability
of the anchoring screw 5 remains unaffected by this compressed position. The
outer edges 22 of the outer expansible portion 3 are disposed so as to form an
abutment face 23 for the inner surface of a hollow body 19 to be attached to
the plug in a plane normal to the centre axis of the plug 1. The abutment face
23 has guide projections 24 for engaging the outer bore of a hollow body 19 to
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104930Z
be mounted. When the tongues 20 have been pushed through an aperture in a
hollow body or the like (Figure 4), they spread radially so that their guide
projections 24 engage the aperture and abutment face 23 engages the inner face
of the hollow body. Wall 25 of hollow body 19 is thus held in place between
the head 26 of the screw and the abutment face 23 of the plug 1. When the
fastening screw is tightened, the inclined lower surface of the flat head 26
of the screw abuts against projection 24. When the wall of the hollow body
and the aperture therein have the proper configuration, the spreading section
20 will be well secured in its operational position (Figure 4).
This type of securing is of particular importance when a blind frame
(Figure 2) is used, because it permits a frictional connection between the
plug 1 and the blind frame 18. The screw head 26 may be disposed inside the
hole 18 of the blind frame, thereby permitting an invisible mounting.
A similarly advantageous use is feasible in a wooden frame18, because
the edges of the tongues 20 may be pressed into the wood so that the frame will
be locked in place. The conical face of the screw head 26 acts in that case
as an expanding cone ~Figure 2).
In particular the combination of the outer expansible portion 3, as
described above and the use of a conical body 7, adapted to be adjusted longi-
tudinally of the plug sleeve 2, by means of the screw 5 offer substantial
advantages of assembly. It can be carried out in a simple fashion, in that
the entire plug unit may be pushed through a bore, permitting the outer abut-
ment face 23 to become engaged with the inside face of a hollow body 19 so that
the latter, together with the plug unit, can be placed in the proper position
relative to a hole 12 in a wall 17. All that is required then is that the
screw be tightened in order to hold everything securely. Any spacing of a
blind frame, a hollow body, or the like from a wall 17 may be obtained in ad-
vantageous fashion.
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