U.S. patent application number 10/562475 was filed with the patent office on 2007-03-15 for auto locked mechanism.
Invention is credited to Simon Garry Moore.
Application Number | 20070056148 10/562475 |
Document ID | / |
Family ID | 36123675 |
Filed Date | 2007-03-15 |
United States Patent
Application |
20070056148 |
Kind Code |
A1 |
Moore; Simon Garry |
March 15, 2007 |
Auto locked mechanism
Abstract
A securing apparatus, including a deformable body, wherein the
body is configured to provide a secure interference fit with at
least one article to which it is fitted, and an aperture within the
body, wherein the aperture is configured to accept a releasing
tool, characterized in that the securing apparatus is only unlocked
by the operation of the releasing tool with respect to the body and
remains locked at all other times.
Inventors: |
Moore; Simon Garry;
(Cambridge, NZ) |
Correspondence
Address: |
KNOBBE MARTENS OLSON & BEAR LLP
2040 MAIN STREET
FOURTEENTH FLOOR
IRVINE
CA
92614
US
|
Family ID: |
36123675 |
Appl. No.: |
10/562475 |
Filed: |
June 24, 2004 |
PCT Filed: |
June 24, 2004 |
PCT NO: |
PCT/NZ04/00132 |
371 Date: |
June 19, 2006 |
Current U.S.
Class: |
24/432 |
Current CPC
Class: |
F16B 7/0426 20130101;
E04G 25/08 20130101; E05D 7/12 20130101; F16B 4/004 20130101; E05D
5/04 20130101; F16B 5/0004 20130101; F16B 37/0828 20130101; F16B
7/0486 20130101; E05D 5/0246 20130101; F16B 7/14 20130101; F16B
7/0413 20130101; Y10T 24/2591 20150115; E05Y 2900/60 20130101; E05D
5/12 20130101 |
Class at
Publication: |
024/432 |
International
Class: |
A44B 19/34 20060101
A44B019/34 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 24, 2003 |
NZ |
526630 |
Claims
1. A securing apparatus comprising: a deformable body, wherein the
body is configured to provide a secure interference fit with at
least one article to which it is fitted, and an aperture within the
body, wherein the aperture is configured to accept a releasing
tool, wherein the securing apparatus is only unlocked by the
operation of the releasing tool with respect to the body and
remains locked at all other times.
2. The securing apparatus as claimed in claim 1 wherein the body is
permanently fixed to part of an article.
3. The securing apparatus as claimed in claim 1 wherein the body is
fitted to an article that is adjustable in length.
4. The securing apparatus as claimed in claim 1 wherein the body
joins a plurality of articles together.
5. The securing apparatus as claimed in claim 1 wherein the body
contains at least one slot that is substantially perpendicular to
the aperture and which bisects at least one side of the
aperture.
6. The securing apparatus as claimed in claim 5 wherein the slot is
terminated by a stress reduction device which is a substantially
circular hole.
7. The securing apparatus as claimed in claim 1 wherein the body
contains a plurality of apertures.
8. The securing apparatus as claimed in claim 7 wherein the
securing apparatus is configured to secure a plurality of articles,
each of which can be released individually.
9. The securing apparatus as claimed in claim 1 wherein the
securing apparatus is configured so that the absence of the
releasing tool from the aperture ensures that the securing device
is in a locked position by default.
10. The securing apparatus as claimed in claim 1 wherein the
dimensions of the body of the securing device when the releasing
tool is not operated are such that the securing apparatus cannot be
connected to the article to which it is to be secured.
11. The securing apparatus as claimed in claim 1 wherein the
securing apparatus is constructed as part of an article to which at
least one other article can be secured.
12. The securing apparatus as claimed in claim 1 wherein the body
is configured to include at least one seal that itself is
configured to stop any leakage of material from within a secured
article.
13. The securing apparatus as claimed in claim 1 wherein the
internal shape of the body is non-circular.
14. The securing apparatus as claimed in claim 13 wherein the
internal shape of the body is oval.
15. The securing apparatus as claimed in claim 1 wherein at least
one article to be secured is tubular.
16. The securing apparatus as claimed in claim 1 wherein at least
one article to be secured is solid.
17. A securing apparatus comprising: a deformable body, wherein the
body is configured to provide a secure interference fit with at
least one article to which it is fitted, and an aperture within the
body, wherein the aperture is configured to accept a releasing
tool, wherein the releasing tool is inserted within the aperture
until the securing apparatus is unlocked.
18. A securing apparatus comprising: a deformable body, wherein the
body is configured to provide a secure interference fit with at
least one article to which it is fitted, and an aperture within the
body, wherein the aperture is configured to accept a releasing
tool, wherein the releasing tool is inserted and partially rotated
within the aperture until the securing apparatus is unlocked.
19. A releasing tool for a securing apparatus as claimed in claim 1
wherein the releasing tool includes a non-circular section.
20. A releasing tool for a securing apparatus as claimed in claim 1
wherein the releasing tool contains a threaded section that is
configured so that the securing apparatus is unlocked by inserting
the releasing tool into a complementary threaded area of the
securing apparatus, to a point where the required widening of an
area of the aperture is achieved.
21. A releasing tool for a securing apparatus as claimed in claim 1
wherein the releasing tool contains a non-uniform section that is
configured so that the insertion of the releasing tool within the
aperture will cause the aperture to spread to a point where the
required widening of an area of the aperture is achieved.
22. A releasing tool for a securing apparatus as claimed in claim 1
wherein the releasing tool remains attached to the mechanism even
when the securing apparatus is locked.
23-25. (canceled)
Description
TECHNICAL FIELD
[0001] This invention relates to an auto locked mechanism.
[0002] In particular the present invention is intended for use with
securing adjustable length poles, and extendable mechanisms, and
also to alternative methods of securing elements together.
BACKGROUND ART
[0003] In many industrial and consumer products there is a need to
adjust the length of elements. Examples of such elements are
telescoping tubes or pipes usually made of metal, but sometimes of
other materials.
[0004] An example is ladders, scaffolding and props in the building
industry, and bicycle seat posts, furniture, walking canes, tent
poles, and ski poles in consumer products.
[0005] Any situation where there are telescoping elements, it can
be an advantage to be able to more reliably secure the elements in
a variety of positions relative to each other.
[0006] Present mechanisms act to secure the elements in a fixed
position. An example is the twist lock on a ski pole where a
friction bush secures the elements, by being compressed by
rotation.
[0007] Often a clamp is used to reduce the diameter of the outer of
the two telescoping elements. Another securing mechanism uses a
grub screw or threaded bolt or threaded T-bar tool to lock up
against the inner telescoping element.
[0008] In industrial situations it is very important that the
fixing is very secure, as failure could lead to injury or death to
people in the vicinity.
[0009] Securing mechanisms require the operator to have enough
strength and knowledge to use the tools provided in the correct way
to achieve a safe connection between the elements. For example a
grub screw or bolt, if insufficiently tightened, may allow the
components to telescope or rotate under load or stress.
[0010] Many of the mechanisms that exist now require several
components and are unnecessarily heavy or complicated, which of
course makes them more expensive to produce.
[0011] All references, including any patents or patent applications
cited in this specification are hereby incorporated by reference.
No admission is made that any reference constitutes prior art. The
discussion of the references states what their authors assert, and
the applicants reserve the right to challenge the accuracy and
pertinence of the cited documents. It will be clearly understood
that, although a number of prior art publications are referred to
herein, this reference does not constitute an admission that any of
these documents form part of the common general knowledge in the
art, in New Zealand or in any other country.
[0012] It is acknowledged that the term `comprise` may, under
varying jurisdictions, be attributed with either an exclusive or an
inclusive meaning. For the purpose of this specification, and
unless otherwise noted, the term `comprise` shall have an inclusive
meaning--i.e. that it will be taken to mean an inclusion of not
only the listed components it directly references, but also other
non-specified components or elements. This rationale will also be
used when the term `comprised` or `comprising` is used in relation
to one or more steps in a method or process.
[0013] It is an object of the present invention to address the
foregoing problems or at least to provide the public with a useful
choice.
[0014] Further aspects and advantages of the present invention will
become apparent from the ensuing description, which is given by way
of example only.
DESCRIPTION OF THE INVENTION
[0015] According to one aspect of the present invention there is
provided a securing apparatus, including [0016] a deformable body,
wherein the body is configured to provide an interference fit with
at least one article to which it is fitted, and [0017] an aperture
within the body, wherein the aperture is configured to accept the
releasing tool, [0018] characterised in that [0019] the securing
apparatus is unlocked by the operation of the releasing tool with
respect to the body and remains locked at all other times.
[0020] Throughout the present specification the term "locked"
should be understood to mean that a force, significantly greater
than that applied during the normal operation of the assembly to
which the present invention is attached, will need to be applied to
the present invention in order to cause the present invention to
release the article to which it is secured.
[0021] It should be understood that in applications where safety
may be an issue, (an example of which would be to secure pieces of
scaffolding or framework etc,) the applied force necessary to cause
the securing device to "slip" or to release the assembly, will need
to exceed any safety limits or guidelines that may apply to the
equipment or installation.
[0022] Within some preferred embodiments of the present invention
the body will contain at least one ridge (or tooth) in order to
improve the grip applied to the article to which the present
invention is attached.
[0023] It should be understood that in some preferred embodiments
of the present invention the article to which the present invention
is attached will have a complementary recess into which a ridge or
tooth will fit to further improve the strength of adhesion between
the article and the present invention.
[0024] Throughout the present specification the term "unlocked"
should be understood to mean that the present invention is able to
be removed from, or moved with respect to, an article to which it
has been, or will be, secured.
[0025] Within some preferred embodiments of the present invention
the releasing tool includes a non-circular section, (such as a cam)
which when inserted and rotated will elastically deform at least
part of the body to increase the internal cross-section
sufficiently, over at least part of the length of the body, to
release any article that is being secured by the securing
apparatus.
[0026] It should be appreciated that throughout the present
specification the term "non-circular section" should be understood
to mean items such as a cam, or any other shape or configuration
which when inserted and/or rotated within an aperture that is
constructed as part of the body of the present invention, will
cause the present invention to be deformed from its resting
position to a point where the present invention can be moved with
respect to the article to which it was, or is intended to be,
secured.
[0027] Within some preferred embodiments of the present invention
the securing apparatus, or at least the body of which, will be
permanently fixed to, or constructed as part of, an article other
than the article to which it is intended to be secured.
[0028] It should be appreciated however that in some other
embodiments of the present invention the securing apparatus is
temporarily affixed to an article including those that can be
adjustable in length.
[0029] It should be appreciated that in some other preferred
embodiments of the present invention the securing apparatus
co-joins a plurality of articles, and in some of these embodiments
each article can be released from the present invention
individually.
[0030] It should be understood that in most preferred embodiments
of the present invention at least one side of the aperture is
bisected by a slot that is substantially perpendicular to the axis
of the aperture, wherein the slot and/or the aperture can be
terminated by a stress reduction device such as a substantially
circular hole.
[0031] The inclusion of the slot allows each section of the
aperture, i.e. the section each side of the slot, to be opened and
operated individually thereby ensuring that the operation of the
releasing tool within one part of the aperture will not release an
article to which another part of the aperture is secured.
[0032] In some preferred embodiments of the present invention there
will be a plurality of apertures, wherein each aperture can be
operated via a releasing tool so as to individually release an
article.
[0033] It should be appreciated that the internal dimensions of the
body of the securing device are smaller than the dimensions of the
shaft/tube/pipe/rod, etc to which the present invention is to be
fitted, as this will greatly improve the locking strength of the
present invention onto such an article.
[0034] In all preferred embodiments of the present invention the
removal of the releasing tool from the aperture will ensure that
the securing device is in a locked position by default.
[0035] This is due to the inherent mechanical properties of the
material(s) from which the body is constructed.
[0036] Operation of the releasing tool will cause a level of
elastic deformation of the body and hence once the tool is removed
the body will try to revert back to its normal "relaxed" state.
[0037] The relaxed dimensions of the body are such that it cannot
be fitted onto the article that it is intended to secure and needs
to be deformed by the releasing tool to a point where its
dimensions are altered sufficiently to where it can fit onto the
article.
[0038] Therefore, once the tool is released the body cannot revert
to its former dimensions due to the presence of the article and it
will therefore exert a force against the article that is hindering
this action.
[0039] It is this force that provides the positive pressure between
the body and the article and hence the interference fit that
secures the two items together.
[0040] This action is equally applicable to securing an article to
the interior surface of the body or to securing an article to the
exterior surface of the body.
[0041] An example of securing an article to the interior surface of
the body would be where an adjustable length rod is needed, as the
rod would need to be able to move through the interior of the body
to the desired position before being secured.
[0042] An example of securing an article to the exterior surface of
the body would be where a streamlined connection of two or more
tubes is desired, as the body would not stand proud of the exterior
surfaces of the tubes.
[0043] It should be appreciated that in some preferred embodiments
of the present invention the releasing tool is constructed with a
threaded section and is configured so that the securing apparatus
is unlocked by the insertion of the releasing tool into a
complementary threaded area of the body, or of the aperture, to a
point wherein the required widening of an area of the aperture is
achieved.
[0044] In some preferred embodiments of the present invention the
releasing tool is tapered or has a non-uniform cross-section (e.g.
a dovetailed or wedged section) configured so that the releasing
tool is pushed into the aperture in order to spread the aperture to
a point where the previously secured article is now insecure or
unlocked, or to the point where the present invention can be fitted
over part of an article to which it is intended to be secured.
[0045] In preferred embodiments of the present invention the body
is configured to include at least one seal wherein the seal is
configured to stop any leakage of material from within a secured
article.
[0046] It should be appreciated that in most embodiments of the
present invention the internal shape of the body will be
circular.
[0047] However, this should not be seen to be a limitation on the
present invention in any way as in other embodiments the body can
be non-circular, e.g. oval, rectangular, triangular etc.
[0048] It should be clearly understood that the present invention
is equally suited to securing tubular items as well as solid items
and that tubular items may be secured by their internal surface or
their external surface.
[0049] The items secured could include tubes or solid bars of any
cross-section, or made of plate glass, sheet or plate metal, or any
other relatively incompressible material, in any cross-section or
dimension.
[0050] A useful application would be a threaded nut which has a
slot allowing an increase in the internal aperture dimension,
perhaps by operation of a releasing tool on the nut, thereby
allowing a quick release, or application of the nut, with out
having to wind along the thread.
[0051] Such a nut could also be designed to be self-locking by the
nut element compressing against the threaded shaft of the bolt
element (whether a bolt or other form). The thread of the nut would
therefore be forming a compressive interference fit on the
bolt.
[0052] According to another aspect of the present invention as
provided a method of operating a securing apparatus, including:
[0053] a deformable body, wherein the body is configured to provide
a secure interference fit with at least one article to which it is
fitted, and [0054] an aperture within the body, wherein the
aperture is configured to accept a releasing tool,
[0055] characterised by the step of [0056] inserting a releasing
tool within the aperture until the securing apparatus is
unlocked.
[0057] According to another aspect of the present invention as
provided a method of operating a securing apparatus, including:
[0058] a deformable body, wherein the body is configured to provide
a secure interference fit with at least one article to which it is
fitted, and [0059] an aperture within the body, wherein the
aperture is configured to accept a releasing tool,
[0060] characterised by the step of [0061] inserting and partially
rotating a releasing tool within the aperture until the securing
apparatus is unlocked.
[0062] According to another aspect of the present invention there
is provided a releasing tool for a securing apparatus as previously
disclosed,
[0063] characterised in that [0064] the releasing tool is
configured to operate with respect to the body in order to unlock
the securing assembly.
[0065] In some preferred embodiments of the present invention the
releasing tool is configured as a cam.
[0066] In some other preferred embodiments of the present invention
the releasing tool is threaded.
[0067] In some other preferred embodiments of the present invention
the releasing tool has a wedge-like configuration.
[0068] It is clear from the a foregoing description that the
present invention has many significant advantages over other forms
of connector, particularly in areas where safety is concerned such
as the construction industry, as a simple glance at the fitted
securing apparatus can ascertain whether the releasing tool is
present or not, as if the releasing tool is not present the
securing apparatus must be in the locked position.
[0069] This simple fact ensures that items such as scaffolding
joints can be seen to be securely fitted as there is no partial
securing of these elements as they will either be locked or
unlocked.
[0070] This overcomes a serious problem with the present mechanisms
that are available as these are generally tightened with an Allen
key (or other securing device) in a manner that allows for partial
securement to be achieved and which can then cause the subsequent
collapse of the structure.
[0071] Another significant advantage of the present invention is
that it can be constructed to operate to either secure an article
by gripping the articles outer surface, or to fit inside and secure
an article by gripping its' inner surface.
[0072] A combination of these systems can also be used e.g. to
secure the inner surface of an article to a stud or rod-like
structure.
[0073] Due to the simplicity of the design of the present invention
it is envisaged that they can also be used in the construction of
various mechanical assemblies, including miniature devices or any
other size of device where the positive securing of a device to
another device or into a preferred position is needed.
[0074] This can include items such as window frames, hinges, etc.
and can be used to replace nuts or other fastenings in a variety of
applications.
[0075] Where the hinge is designed to self lock onto the parts it
connects to, such as plate glass, the hinge pin could have a cam
aperture and slot, both orientated lengthways, allowing the hinge
pin to have a dual function of being the element the hinge parts
rotate about and also the location for the insertion of a releasing
tool (in the cam aperture of the hinge pin)
[0076] Another advantage of the present invention is that the
operation of the releasing tool can be used to not only remove the
securing device from the article but also to adjust the position of
the article with respect to the securing device or another article
to which the securing device is adjoined.
DESCRIPTION OF VIEWS OF THE INVENTION
[0077] FIG. 1: A diagrammatical representation of a trench prop
with an auto locked mechanism in various stages of assembly and
extension.
[0078] FIG. 2: A diagrammatical representation of an auto locked
mechanism, which uses a cam tool.
[0079] FIG. 3: A diagrammatical representation of a pedestal table
base with an auto locked mechanism.
[0080] FIG. 4: A diagrammatical representation of an auto locked
connector, which is an example of a mechanism that uses a threaded
tool.
[0081] FIG. 5. An auto locked connector for securing to articles by
an internal surface.
[0082] FIG. 6. An auto locked nut.
[0083] FIG. 7. A toothed auto locked connector.
[0084] FIG. 8. An extruded auto locked window frame or picture
frame moulding.
[0085] FIG. 9. An auto locked connector for securing sheet
materials.
[0086] FIG. 10. A releasing tool and auto locking slotted tube.
[0087] FIG. 11. An auto locked hinge with split hinge pin and
associated releasing tool.
[0088] FIG. 12. An auto locked tube or pipe T-shaped connector.
[0089] FIG. 13. An auto locked tube or pipe straight connector.
[0090] FIG. 14. An auto locked tube or pipe telescopic
connector.
[0091] FIG. 15. A wedge shaped releasing tool, and auto locking
slotted tube with dovetailed slot detailing.
BEST MODES FOR CARRYING OUT THE INVENTION
[0092] With reference to the figures there as illustrated a
securing apparatus.
[0093] The securing apparatus (1) consists of a body (2) and an
aperture (3.)
[0094] Some embodiments also contain a side slot (4), particularly
if the aperture (3) does not extend the full length of the body
(2), or if the aperture (3) is split into separately operated
sections.
[0095] FIG. 1 shows the securing apparatus (1) fitted to the end of
a hollow shaft (5).
[0096] The telescoping section (6), which has a smaller
cross-sectional area, is then secured by an area of the body (2)
with a correspondingly smaller cross-sectional area to the area
securing the hollow shaft (5).
[0097] It is necessary to adjust the position of the telescoping
section (6) with respect to the shaft (5 ) without affecting the
locking of the securing apparatus (1) onto the shaft (5).
[0098] Therefore a side slot (4) bisects the aperture (3) so that
each section of the securing apparatus (1) can be released
separately.
[0099] FIG. 2 shows a similar embodiment of the securing apparatus
to that in FIG. 1, however this embodiment has a non-aperture
section (7) of the body (2) that can be permanently affixed to
items such as the shaft (5).
[0100] It should be noted that the non-aperture section (7 ) can
equally be constructed as part of a device or assembly, including a
shaft (7) such as in FIG. 1.
[0101] FIG. 2 clearly shows that this embodiment is to be operated
with a cam style releasing tool.
[0102] FIG. 3 shows a pedestal table leg (8) that can have its
length adjusted.
[0103] The securing apparatus 1 in this application is of an
extended body length (2) in order to provide a large surface
contact area between the body (2) and the leg (8) to increase the
load that is able to be safely supported by the table leg (8).
[0104] It should be noted that the stress reduction device (9) can
clearly be seen at the end of the aperture (3) in the close up view
of figure (3).
[0105] FIG. 4 shows a typical securing apparatus (1) for securing
two articles together.
[0106] A threaded releasing tool (13) is inserted into a
complementarily threaded section (10) if the body (2) until the
aperture (3) is opened sufficiently to allow the securing apparatus
(1) to be moved over the parts of the two articles that are to be
secured together.
[0107] The threaded releasing tool (13) is then removed so that the
aperture (3) will try to close to its original position and will
therefore secure the two articles together.
[0108] FIG. 5 shows an alternative to the securing apparatus (1) in
FIG. 4, wherein the securing apparatus (1) is configured to join
the two articles together by securing their internal surfaces (11)
rather than their external surfaces as in FIG. 4.
[0109] The body (2) includes a section (12) that can rotate around
the body (2).
[0110] The rotating section (12) includes a threaded section
(10).
[0111] The body (2) includes a number of apertures (3) at either
end of the body (2), all of which extend only partially along the
length of the body (2).
[0112] The threaded releasing tool (13) is inserted into the
threaded section (10) which is positioned so that when fully
inserted the releasing tool (13) will press against a section of
the body (2) causing at least one aperture (3) and a section of the
body (2) to deform to a point where (for example), a tube (14) can
be fitted over one end of the securing apparatus (1).
[0113] Once the releasing tool (13) is at least partially removed
the body (2) and apertures (3) will try to assume their previous
positions and thereby will secure the tube (14) by its inside
surface.
[0114] Any releasing tool described in this specification may
remain attached some part of the mechanism, or item the mechanism
is attached to, even when the securing apparatus is locked. In this
way the tool is to hand when needed to use.
[0115] The rotating section (12) is then moved to a position where
the releasing tool (13) can be wound in to deform a corresponding
aperture (3) and section of the body (2) at the opposite end of the
securing apparatus (1) in order that the process can be repeated to
secure the second tube (14) to the securing apparatus (1).
[0116] FIG. 6 shows an example of a quick release slotted nut, with
a thread (18) that will engage a threaded bolt (not shown) located
at the aperture (21). This nut could be configured to perform the
function of a spring washer.
[0117] FIG. 7 shows an auto locking fitting with a ribbed internal
surface area (20), which would enhance the gripping action. A cam
shaped releasing tool would operate in the cam hole (19).
[0118] FIG. 8 is an example of an extruded profile, which could
lock on a plate element (location at (21)). A rubber extrusion
could be used in a recess (22) to ensure no damage to fragile sheet
materials such as glass.
[0119] FIG. 10 shows a tool (22), which uses leverage to open an
auto locking tube (26). In this way a simple slot in a tube can be
used and the tube itself can be the auto locking mechanism itself.
In this case the internal diameter of the tube (26) would be a
little smaller than the external diameter of the tube or element it
is designed to auto lock onto (not shown).
[0120] FIG. 11 shows a hinge designed to self lock onto the parts
it connects to, such as plate glass, the hinge pin (27) could have
a cam aperture (39) and slot (38), both orientated lengthways,
allowing the hinge pin to have a dual function of being the element
the hinge parts rotate about and also the location for the
insertion of a releasing tool (in the cam aperture of the hinge pin
(39)) Rotating a cam release tool in the aperture (39) would
increase the separation of the two sides of the hinge (30 and
31).
[0121] With the releasing tool removed, the cam hinge pin would be
circular in external cross section, and cam shaped in internal
cross section.
[0122] FIGS. 12, 13, and 14 show respectively T-shaped, straight
and telescoping tube or pipefittings. There is a raised boss (45)
that increases the surface area for the cam action and a cam hole
(42) for the releasing tool to operate within. The cam hole is
split by a longitudinal slot, which allows the auto locked
mechanism to increase in internal dimension with the action of the
releasing tool.
[0123] The telescoping tube mechanism in FIG. 14 secures a larger
tube (not shown) at one end (43) and a smaller telescoping tube
(not shown) with the other end (44), in the aperture shown (41).
The side slot (46) allows one end (44) to open. And the other (43)
to remain fixed.
[0124] FIG. 15 shows a simple tubular auto locking mechanism (36)
(although it need not be this cross section), which has a slot
(34), which is widened by the action of the releasing tool (32). In
use the tool is grasped by a handle portion (35) and forcibly slid
along the slot (34) to increase the internal dimension of the
aperture (37). The cross section of the tool (32) may be reduced in
the leading end (33) to aid the insertion and use of the releasing
tool.
[0125] Aspects of the present invention have been discussed by way
of example only and it should be appreciated that modifications and
additions may be made thereto without departing from the scope
thereof as defined in the appended claims.
* * * * *