IE84208B1 - A tamper evident cap - Google Patents
A tamper evident cap Download PDFInfo
- Publication number
- IE84208B1 IE84208B1 IE1999/0682A IE990682A IE84208B1 IE 84208 B1 IE84208 B1 IE 84208B1 IE 1999/0682 A IE1999/0682 A IE 1999/0682A IE 990682 A IE990682 A IE 990682A IE 84208 B1 IE84208 B1 IE 84208B1
- Authority
- IE
- Ireland
- Prior art keywords
- side wall
- cap
- tamper evident
- skirt
- wall
- Prior art date
Links
- 239000002737 fuel gas Substances 0.000 claims description 10
- 230000000295 complement Effects 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 7
- 229920003023 plastic Polymers 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 3
- 210000001138 Tears Anatomy 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
Description
"A tamper evident cap"
Introduction
This invention relates to a tamper evident cap for a
discharge valve on a pressurised fuel gas bottle.
In a previously filed patent application, Publication No.
GB 2301348, we disclosed a tamper evident cap for fuel gas
bottle valve. The cap has a cylindrical side wall closed
at one end by a top wall with a retaining ring on an
inside face of the side wall for snap engagement within a
complementary circumferential recess in an exterior of the
gas bottle valve. A tear—away strip in the side wall can
be torn away to release the cap for removal of the cap.
Other examples of tamper
indicating Caps
GB 2182915,
generally are
given in Patent Specification Nos. GB 2097768,
EP 0364857 and US 4712705.
The present invention is particularly concerned with the
of this type
valve
application of tamper indicating cap to
relatively small bodies - such that the cap
typically has a nominal internal diameter in the order of
because of
about 20 mm for example. These small caps,
their size, are more easily removed by unauthorised
personnel without damaging the tear—away strip. They can
be manually gripped and worked off the valve, if necessary
prising a screwdriver between the bottom edge of the side
wall and the valve.
The present invention is directed towards overcoming this
problem.
Statements of Invention
According to the invention there is provided a tamper
evident plastics cap for a discharge valve on a
pressurised fuel gas bottle, the cap comprising a
generally cylindrical side wall terminating in a domed top
wall at an upper end of the side wall, the outer surface
of the side wall and the top wall being of smooth
construction, retaining means on the side wall for
securing the cap in engagement with the discharge valve of
the pressurised fuel gas bottle, the retaining means
comprising’ a circumferential ridge within, the cap on an
inner face of the side wall, the circumferential ridge
projecting inwardly on the inner face of the side wall for
snap engagement in a complementary circumferential groove
on an outer wall of the discharge valve of the pressurised
fuel gas bottle, the cap side wall incorporating a tear-
away strip extending upwardly from a bottom edge of the
side wall, the tear—away strip being defined by a pair of
spaced—apart grooves in the side wall extending upwardly
froH1 a bottonx edge of the side wall and extending‘ over
portion of the domed top wall, the tear—away strip having
an outwardly extending pull tab at a botton1 end of the
tear—away strip, and a tamper evident skirt provided at a
bottom of a side wall and extending downwardly therefrom,
evident skirt number of
the tamper having a
circumferentially spaced—apart grooves, each groove
extending between a bottom and a top of the skirt in which
the wall thickness of the skirt is reduced, defining a
number‘ of castellations interconnected by thin, frangible
membranes at the grooves.
Advantageously the domed construction of the top wall and
the smoothness of the side wall and top wall makes the cap
grip,
Also,
very difficult to again inhibiting unauthorised
removal of the cap. advantageously, any attempt to
prise the cap off the valve, by for example engaging a
screwdriver with the bottom edge of the cap, will break
the skirt to give evidence that the cap has been
interfered with. The skirt will readily break at one or
more of the grooves in the event of attempted unauthorised
removal of the cap to give tamper indication.
In a further embodiment, an internally bevelled transition
portion is provided, betweenc a top of the skirt and the
bottom of the side wall, an inner face of the side wall of
the cap at the bottom of the side wall tapering outwardly
to meet the top of the skirt. This conveniently allows
the smooth engagement of the inner face of the side wall
with the valve when pushing a cap onto the valve.
Instead of the slots the upper rim of the skirt may itself
be attached to the bottom edge of the side wall by a thin
membrane such that any attempt to interfere with the skirt
will break it away from the side wall.
Preferably, the retaining ridge and/or the cap side wall
are of a plastics material which is sufficiently resilient
resilient deformation for
to allow engagement of the
retaining ridge within, the complementary groove in the
valve such that the cap can be pressed onto the valve.
To aid in removal of the tear—away strip, preferably a
ring pull is provided at a bottom end of the tear~away
strip.
Detailed Description of the Invention
The invention will be more clearly understood by the
following description of some embodiments thereof, given
by way of example only, with reference to the accompanying
drawings, in which:
Fig. l is a perspective view of a tamper evident cap
according to the invention;
Fig. 2 is a plan view of the cap;
Fig. 3 is a sectional elevational View of the cap; and
Fig. 4 is an elevational view of the cap shown mounted
on a valve of a pressurised gas bottle which is
indicated in broken outline.
Referring’ to the drawings there is illustrated. a tamper
evident cap according to the invention indicated generally
by the reference numeral l.
side wall 2
hemispherical domed top wall 3 at an upper end of the side
wall 2.
wall 2 and has an associated ring pull 5 for parting the
The cap 1 has a generally
cylindrical terminating in a generally
A tear-away strip 4 is incorporated in the side
strip 4 from the side wall 2. Also a tamper evident skirt
6 is provided at a bottom of a side wall 2. Within the
cap 3 on an inner face of the side wall 2 is a
circumferential retaining ridge 7 which projects inwardly
on an inside face 8 of the side wall 2 for snap engagement
with a complementary circumferential groove (not shown) on
an outer wall of a valve 10 of a pressurised. fuel gas
bottle.
extends
The tamper evident skirt 6
bottom of the side wall 2.
downwardly from a
A number of weakened portions
are provided. in the skirt 6 formed. by circumferentially
spaced-apart vertical grooves 11 in which the wall
thickness of the skirt 6 is reduced. The grooves ll
extend between. a bottom and a top of the skirt 6 and
essentially divide the skirt 6 into a number of
castellations l2 interconnected by thin frangible
membranes 13 at the grooves ll.
An internally bevelled transition portion 14 is provided
between a top of the skirt 6 and the bottom of the side
wall 2. Thus, the inside face 8 of the side wall 2 tapers
outwardly and downwardly to meet the top of the skirt 6.
The tear—away strip 4 is defined by a pair of spaced-apart
grooves or slots 15, 16 which extend upwardly from a
bottom edge of the skirt 6 through the side wall 2. The
slots 15, 16 provide areas where the thickness of the side
wall 2 is reduced sufficiently so that upon engagement of
the ring pull 5 the strip 4 can be torn upwardly so that
It will be
that the slots 15, 16 extend up the side wall and
Thus the strip 4
the cap 1 can be released from the valve 10.
noted
partially across the domed top wall 3.
can be torn away while at the same time remaining attached
to the top wall 3 for convenient disposal.
It will be noted that the outer surface of the side wall 2
and top 3 are smooth. This feature and in addition the
domed construction of the top wall 3 make it very
difficult for someone to grip the outside of the cap for
unauthorised removal.
In use, a pressurised gas bottle is filled and then the
cap 1 is pressed into engagement with the valve 10. This
can be done in a single movement pressing the cap 1
downwardly. The cap 1. is of plastics material which is
sufficiently resilient such that the side wall 2 and ridge
7 deform so that the cap 1 can be pressed downwardly over
the valve until the ridge 7 snaps into engagement with a
complementary groove on an outer side wall of the valve
. The cap 1 is then locked in position on the valve 10
and can only be removed by releasing the tear—away strip 4
which gives evidence of tampering.
off the
Any attempt to prise
the cap 1 upwardly valve 10 by for example
engaging a screwdriver with a bottom edge of the skirt 6
will damage the skirt 6 breaking the skirt 6 at one or
more of the slots 11 to give evidence of tampering.
It will be noted that the depth of the ridge 7 is such as
to allow the cap 1 be pressed into engagement with the
valve 10 but once the ridge 7 is engaged with the
complementary groove on the valve 10 the cap 1 cannot be
pulled. off the valve 10 without releasing the tear—away
strip 4. It will also be noted that the ridge 7 is
interrupted at positions corresponding to the slots 15, 16
on the inside wall 8.
The ring pull 5 provides a secure grip for removal of the
tear-away strip.
limited to the
The invention is not embodiments
hereinbefore described which may be varied in both
construction and detail within the scope of the appended
claims.
Claims (1)
- CLAIMS A tamper evident plastics cap for a discharge valve on a pressurised fuel gas bottle, the cap comprising a generally cylindrical side wall terminating in a domed top wall at an upper end of the side wall, the outer surface of the side wall and the top wall being of smooth construction, retaining means on the side wall for securing the cap in engagement with the discharge valve of the pressurised fuel gas bottle, the retaining means comprising a circumferential ridge within the cap on an inner face of the side wall, on the the circumferential ridge projecting inwardly inner face of the side wall for snap engagement jjl a complementary circumferential groove of the discharge valve of the bottle, the cap side wall on an outer wall pressurised fuel gas incorporating a tear—away strip extending upwardly frmn a bottom edge of the side wall, the tear—away strip being defined by a pair of spaced-apart grooves in the side wall extending upwardly fIOHl a bottom edge of the side wall and extending over portion of the domed top wall, the tear—away strip having an outwardly extending pull tab at a bottom end of the tear-away strip, and a tamper evident skirt provided at a bottom of a side wall and extending downwardly therefrom, the tamper evident skirt having a number of circumferentially spaced-apart grooves, each groove extending between a bottom and a top of the skirt in which the wall thickness of the skirt is castellations at the reduced defining a number of interconnected by thin frangible membranes grooves. A tamper evident plastics cap as claimed in claim 1, wherein an internally bevelled transition portion is provided between a top of the skirt and the bottom of the side wall, an inner face of the side wall of the cap at the bottom of the side wall tapering outwardly to meet the top of the skirt. A tamper evident cap as claimed in claim l, wherein a top of the tamper evident skirt is attached to the bOttOH1 edge of the side wall by a thin frangible membrane. A tamper evident cap as claimed in claim 1, wherein the retaining ridge and/or the cap side wall are of a plastics material which is sufficiently resilient to allow resilient deformation for engagement of the retaining ridge within the complementary groove in the valve such that the cap can be pressed onto the valve. A tamper evident cap as claimed in any preceding claim, wherein a ring pull is provided at a bottom end of the tear—away strip. A tamper evident plastics cap for a discharge valve on a pressurised fuel gas bottle substantially as hereinbefore described with reference to the accompanying drawings. CRUICKSHANK & CO. 84208
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE1999/0682A IE84208B1 (en) | 1999-08-09 | A tamper evident cap |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IEIRELAND07/08/1998S1998/0660 | |||
IE19980660A IES980660A2 (en) | 1998-08-07 | 1998-08-07 | A tamper evident cap |
IE1999/0682A IE84208B1 (en) | 1999-08-09 | A tamper evident cap |
Publications (2)
Publication Number | Publication Date |
---|---|
IE990682A1 IE990682A1 (en) | 2000-03-22 |
IE84208B1 true IE84208B1 (en) | 2006-05-17 |
Family
ID=
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