NZ790128A - Clutch having abutment surfaces - Google Patents
Clutch having abutment surfacesInfo
- Publication number
- NZ790128A NZ790128A NZ790128A NZ79012822A NZ790128A NZ 790128 A NZ790128 A NZ 790128A NZ 790128 A NZ790128 A NZ 790128A NZ 79012822 A NZ79012822 A NZ 79012822A NZ 790128 A NZ790128 A NZ 790128A
- Authority
- NZ
- New Zealand
- Prior art keywords
- toroidal
- clutch
- connector
- coupler
- relative
- Prior art date
Links
Abstract
clutch for lifting a concrete component, including a toroidal connector, a latch movable relative to the toroidal connector between a disengaged condition and an engaged condition, and a coupler for coupling the toroidal connector to a lifting apparatus, wherein the toroidal connector has a circular seat for sitting upon a circular upper surface of a head of and anchor coupled to the toroidal connector, wherein the circular seat terminates in a radial bearing surface for abutment with a castellation of the anchor. ar seat for sitting upon a circular upper surface of a head of and anchor coupled to the toroidal connector, wherein the circular seat terminates in a radial bearing surface for abutment with a castellation of the anchor.
Description
A clutch for lifting a concrete component, including a toroidal connector, a latch movable relative
to the toroidal connector between a disengaged condition and an engaged condition, and a
coupler for coupling the toroidal connector to a lifting apparatus, wherein the toroidal connector
has a circular seat for sitting upon a circular upper surface of a head of and anchor coupled to the
toroidal connector, wherein the circular seat terminates in a radial g e for abutment
with a castellation of the anchor.
NZ 790128
CLUTCH HAVING ABUTMENT SURFACES
FIELD OF THE ION
This invention relates to a clutch. More particularly, but not exclusively, the invention
relates to an articulated clutch for lifting a concrete ent by way of an anchor
cast into the concrete component.
BACKGROUND OF THE INVENTION
It is known to provide a clutch for lifting concrete components where the clutch is used
to lift, for example, concrete panels after casting by way of a cast-in edge-lift anchor
and for moving them to curing racks and later onto trucks for transportation to a
construction site. However, the applicant has identified that there are disadvantages
with existing lifting clutches.
The ant has determined that it would be beneficial for there to be provided a clutch
which overcomes or at least alleviates one or more disadvantages of existing clutches.
Accordingly, examples of the present invention seek to avoid or at least ameliorate the
disadvantages of existing clutches.
Y OF THE INVENTION
In accordance with the t invention, there is provided a clutch for g a concrete
component, including a toroidal connector, a latch movable relative to the toroidal
connector between a disengaged condition and an d condition, and a coupler for
coupling the toroidal connector to a lifting apparatus, n the toroidal connector
has a ar seat for sitting upon a circular upper surface of a head of an anchor
coupled to the toroidal connector, wherein the circular seat ates in a radial
bearing surface for abutment with a castellation of the anchor.
Preferably, the circular seat has a first radial bearing surface for abutment with a first
castellation of the anchor and a , opposite, radial bearing surface for abutment
with a second castellation of the anchor.
In a preferred form, the circular seat is circular about an arc having a centre at a central
longitudinal axis of the latch. More preferably, the radial bearing surface is radial
relative to a circle having a centre at the l longitudinal axis of the latch.
There is also disclosed a clutch for lifting a concrete ent, including a toroidal
connector, a latch movable relative to the toroidal connector n a disengaged
condition and an engaged ion, and a coupler for coupling the toroidal connector
to a lifting tus, wherein the r is articulated.
Preferably, the coupler includes a first part and a second part pivotal relative to the first
part, the first part g a first loop engaged through the toroidal connector and the
second part forming a second loop for receiving the g apparatus.
Preferably, the first loop is a different size to the second loop. More preferably, the first
loop is smaller than the second loop.
In a preferred form, the second loop is adapted to allow direct fitment of a lifting chain
while also allowing direct fitment of a lifting hook.
It is preferred that the coupler includes an elongated pin about a longitudinal axis of
which the second part is pivotal relative to the first part.
Preferably, the latch is in the form of a circular latch passing through an inner circular
passage of the toroidal connector.
There is also disclosed a clutch for lifting a concrete component, including a toroidal
connector, a latch movable relative to the toroidal connector n a disengaged
condition and an engaged condition, and a coupler for coupling the toroidal connector
to a g apparatus, wherein the coupler includes a first part and a second part pivotal
relative to the first part about a pin, the first part having a first circular arc and the
second part having a second circular arc, and wherein the pin is located such that a
longitudinal axis of the pin is perpendicular to a line connecting a centre of the first arc
to a centre of the second arc.
There is also disclosed a clutch for lifting a concrete component, including a al
connector, a latch in the form of a locking ring movable relative to the toroidal connector
between a disengaged condition and an engaged condition, the g ring having a
handle extending radially outwardly from the toroidal connector, and a coupler for
coupling the toroidal connector to a g tus, wherein the coupler includes a
first part and a second part pivotal relative to the first part, the coupler being arranged
to limit pivotal movement of the second part relative to the first part.
Preferably, the coupler is arranged to limit pivotal movement of the second part ve
to the first part in one direction. More preferably, the coupler is arranged to limit pivotal
movement of the second part relative to the first part such that said limit prevents a tip
of the locking ring handle passing through an inner loop of the second part.
In a preferred form, the first part includes a shoulder ed to bear against the
second part at said limit.
The second part may include a shoulder ed to bear against the first part at said
limit.
Preferably, the coupler is arranged to limit pivotal movement of the second part relative
to the first part such that said limit prevents the second part from engaging with the
locking ring handle to rotate the locking ring handle. More preferably, the r is
arranged to limit pivotal movement of the second part relative to the first part such that
said limit prevents the second part from engaging with the locking ring handle to rotate
the locking ring handle from the engaged condition to the disengaged condition.
There is also disclosed a clutch for lifting a te component, including a toroidal
connector, a latch movable relative to the toroidal connector between a disengaged
condition and an engaged condition, and a coupler for coupling the toroidal connector
to a lifting tus, n the coupler includes a first part and a second part pivotal
relative to the first part about a pin, and wherein the coupler includes a tamper evident
indicator to indicate that the clutch has not been disassembled.
Preferably, the tamper evident indicator is arranged to indicate that the pin has not
been removed from the coupler.
In a red form, the coupler is provided with a bush around a central portion of the
pin. More preferably, the pin has a circular groove about its circumference and the
tamper evident indicator includes a member in engagement with the circular groove to
prevent movement of the pin along its longitudinal axis relative to the bush.
More preferably, the member is anchored to the bush.
In one form, the member is in the form of a rivet.
Alternatively, the member is in the form of a roll pin.
There is also disclosed a clutch for lifting a concrete component, including a al
connector, a latch in the form of a g ring movable ve to the toroidal connector
between a disengaged condition and an engaged condition, the locking ring having a
handle extending radially outwardly from the toroidal connector, and a r for
ng the toroidal connector to a g apparatus, wherein the locking ring handle is
arranged to abut the coupler to limit rotational movement of the coupler relative to the
toroidal connector.
Preferably, the locking ring handle is arranged to limit rotational movement of the
coupler relative to the al connector such that said limit prevents a tip of the locking
ring handle passing through an inner loop of the r.
Preferably, the coupler is arranged to limit pivotal movement of the second part relative
to the first part in two directions.
Preferably, the first part is connected to the second part by a pivotal coupling. More
preferably, the pivotal coupling includes a first hinge at one side of the coupler and a
second hinge at an opposite side of the coupler. Even more preferably, the first hinge
and the second hinge are arranged to provide pivotal movement along a common axis.
In a preferred form, the coupler includes a bush between the first hinge and the second
hinge. More preferably, the bush includes a stop for abutting against the first part or
the second part to limit rotation of the second part relative to the first part. Even more
preferably, the bush is arranged to rotate with the second part and the stop is d
to abut against the first part to limit rotation of the second part relative to the first part.
ably, the first part is provided with a tab for abutment with the stop. More
preferably, the stop is in the form of a cutout having two stop es, comprising a
first stop surface for abutting one side of the tab and a second stop surface for abutting
an opposite side of the tab for limiting rotation of the second part relative to the first
part in two directions.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is further described by way of miting example only with reference
to the accompanying drawings, in which:
Figure 1 shows a perspective view of an articulated clutch for lifting a te
component in accordance with an example of the present invention;
Figure 2 shows a side view of the articulated clutch;
Figure 3 shows a front view of the articulated clutch;
Figure 4 shows an exploded view of the articulated clutch;
Figure 5 shows a front view of the articulated clutch, ing a tamper evident
device incorporated into the clutch;
Figure 6 shows a side cross-sectional view of the lated clutch, depicting
location of the tamper evident device when in situ;
Figure 7 is a detailed perspective view of an end of the tamper evident device
when in situ;
Figure 8 shows a perspective view of the articulated clutch, depicting a limit of
rotation of a second part of a coupler relative to a first part of the coupler;
Figure 9a shows a front view of the articulated clutch, depicting the limit of
rotation of the second part relative to the first part;
Figure 9b shows a sectional view of the articulated clutch taken along line
A-A shown in Figure 9a;
Figure 9c shows a side view of the articulated , depicting the limit of
rotation of the second part relative to the first part;
Figure 10 shows a side perspective view of a toroidal connector of the
articulated clutch;
Figure 11a shows a front view of the toroidal connector;
Figure 11b shows a side sectional view of the toroidal connector taken
along line A-A shown in Figure 11a;
Figure 12 shows an opposite side perspective view of the toroidal connector;
Figure 13 shows a cross-sectional view of the al connector when
connected to a head of a cast-in anchor, taken through a l plane of the toroidal
connector;
Figure 14 shows a front view of a coupler of the articulated clutch, depicting an
axis of rotation of the second part relative to the first part with respect to a central line
of the coupler connecting a centre of a circular arc of the first part with a centre of a
ar arc of the second part;
Figure 15 shows a side view of an articulated clutch in accordance with another
example, depicting the limit of rotation of the coupler relative to the toroidal connector;
Figure 16 shows a perspective view an articulated clutch in accordance with
another example, depicting a g ring handle being sufficiently long to limit rotation
of the coupler relative to the toroidal connector;
Figure 17 shows a top view of the articulated clutch shown in Figure 16;
Figure 18 shows a side view of the articulated clutch shown in Figure 16;
Figure 19 shows a perspective view of the articulated clutch in accordance with
another example;
Figure 20 shows a detailed view of portion labelled "B" in Figure 19;
Figure 21 shows a front view of the articulated clutch shown in Figure 19 and
Figure 20; and
Figure 22 shows a detailed view of section A-A shown in Figure 21.
DETAILED DESCRIPTION
As can be seen in Figures 1 to 18 of the drawings, the present invention may provide
an articulated clutch for lifting a concrete component. Advantageously, the lated
clutch has a r including a first part and a second part pivotal ve to the first
part. The first part forms a first loop and the second part forms a second loop. The two
loops are ilar in size such that the top loop (when g) provided by the second
loop will accept a crane or lifting hook but can still accept a suitable size chain fitted
directly to the top loop.
More specifically, as shown in Figures 1 to 4, there is provided a clutch 10 for lifting a
concrete component (not shown). The concrete component may take several forms
including, but not limited to, a concrete panel. The concrete component may have a
cast in edge lift anchor (for example), the anchor having an eye which is used for
connection to a toroidal connector of the clutch 10 for lifting the concrete panel.
The clutch 10 includes a toroidal connector 12 and a latch 14. The latch 14 is movable
relative to the toroidal connector 12 between a disengaged ion (in which the latch
14 is retracted into a toroidal sleeve of the al connector 12) and an engaged
condition (see Figure 2) in which the latch 14 spans a gap of the toroidal connector 12
for engagement with an eye of and anchor cast into a concrete component. The clutch
10 also includes a coupler 16 for coupling the toroidal connector 12 to a g apparatus
18, wherein the coupler 16 is articulated.
The coupler 16 es a first part 20 and a second part 22 pivotal relative to the first
part, the first part forming a first loop 24 engaged through the toroidal connector 12
and the second part 22 forming a second loop 26 for receiving the lifting apparatus 18.
As shown, the first loop 24 is a different size to the second loop 26. More specifically,
the first loop 24 is r than the second loop 26. The second loop 26 is adapted to
allow direct fitment of a lifting chain while also allowing direct fitment of a lifting hook.
Accordingly, the coupler 16 allows the direct fitment of a suitable size chain like a
hammerlock but also allows for direct fitment to a lifting hook as shown in Figure 5.
The articulation of this format of clutch handle (in the form of coupler 16) addresses the
issue of welded handles getting bent around the head of a concrete panel as the panel
is lifted off a truck at a building site, as the concrete panel is lifted and then rotated 90°
before being positioned. It does this while also meeting the needs of the precast factory
where the clutch 10 is used to lift concrete panels from horizontal to al after casting
and for moving them to curing racks and later onto trucks for transportation to a building
site.
The compact size of the two loops (the first loop 24 and the second loop 26) also allows
for greater head height within the factory, allowing for a gain in lifting height. This in
turn allows for increased panel sizes as well as increased manoeuvrability within the
factory, where g height is limited by the gantry height.
As shown in Figure 4, the coupler 16 includes an ted axle pin 28 about a
longitudinal axis of which the second part 22 is pivotal ve to the first part 20. The
first part 20 includes a forked end and a non-forked end. The forked end of the first part
engages with a non-forked end of the second part 22, whereas the non-forked end
of the first part 20 engages with a forked end of the second part 22. The ends of the
first part 20 and the second part 22 are provided with apertures through which the axle
pin 28 is passed so as to hold together in pivotal relationship the first part 20 and the
second part 22.
With reference to Figure 4, the latch 14 is in the form of a circular latch passing through
an inner circular passage of the toroidal tor 12. The latch 14 has a handle 30 for
moving the latch 14 between the disengaged condition and the d condition, the
handle 30 extending generally radially outwardly relative to a centre of the toroidal
connector 12.
As shown most clearly in Figure 14, the first part 20 has a first circular arc 32 and the
second part 22 has a second circular arc 34. The pin 28 is located such that a longitudinal
axis of the pin 28 is perpendicular to a line 36 connecting a centre 38 of the first arc 32
to a centre 40 of the second arc 34.
Accordingly, the axle pin 28 runs perpendicular to the centre line between the arcs of
the two loops 24, 26. This allows the handle (coupler 16) to be symmetrical such that
when rotated about the toroidal connector 12, the coupler 16 has the same angular
movement either way. This perpendicular configuration may also assist in the
articulation of the coupler 16 when it needs to be bent around the end of a concrete
panel being lifted.
Turning to Figures 8 to 9c, the latch 14 in the form of the locking ring may have a handle
extending lly radially outwardly from the toroidal connector 12. The coupler
16 may be specifically arranged to limit l nt of the second part 22 relative
to the first part 20. In other words, in Figure 2 the first part 20 and the second part 22
are shown in a co-planar configuration, whereas in Figures 8 to 9c there is shown a limit
of pivotal movement of the second part 22 relative to the first part 20.
In one form, the coupler 16 may be arranged to limit pivotal movement of the second
part 22 relative to the first part 20 in one ion. The coupler 16 may also be arranged
to limit pivotal movement of the second part 22 relative to the first part 20 such that
the limit prevents a tip 42 of the g ring handle passing through an inner loop 26
of the second part 22.
As best shown in the cross-sectional drawing shown in Figure 9B, the first part may
include a shoulder 44 arranged to bear against the second part 22 at the limit.
Alternatively, or in addition, the second part 22 may include a shoulder arranged to bear
against the first part 20 at the limit.
In a preferred example, the coupler 16 is arranged to limit pivotal movement of the
second part 22 relative to the first part 20 such that the limit prevents the second part
22 from engaging with the locking ring handle 30 to rotate the locking ring handle 30.
More specifically, the r 16 may be arranged to limit pivotal movement of the
second part 22 relative to the first part 20 such that the limit prevents the second part
22 from ng with the g ring handle 30 to rotate the locking ring handle 30
from the engaged condition to the disengaged condition.
In this way, the two loops 24, 26 are limited in rotation in one ion to ate the
large loop being able to hook under the locking ring handle 30. The ant has
identified that, where the upper loop (secondly 26) is large enough to accept a lifting
hook, then that loop has the potential to cook under the locking ring handle 30 and
could allow the clutch 10 to become disconnected from the anchor unintentionally.
Advantageously, by limiting rotation in this way es of the present invention are
able to prevent unintentional disconnection.
As shown in Figures 4 to 7, the second part 22 is l relative to the first part 20
about the axle pin 28. The coupler 16 may also include a tamper evident indicator 46
to indicate that the clutch 10 has not been disassembled. The tamper evident indicator
may be is arranged to indicate that the axle pin 28 has not been removed from the
coupler 16. In the example shown, the coupler 16 is provided with a bush 48 around a
central portion of the axle pin 28, the central portion being between the distal end of
the first part 20 and the second part 22. The second part 22 may be provided with
longitudinal slots which are received in corresponding longitudinal s of the bush
48 to keep the bush 48 aligned relative to the second part 22 and to prevent rotation
of the bush 48 relative to the second part 22.
With reference to Figure 4, the pin 28 may have a circular groove 50 about its
circumference and the tamper evident indicator 46 may include a member in
engagement with the circular groove 50 to prevent movement of the pin 28 along its
longitudinal axis relative to the bush 48. In addition, the toroidal connector 12 may be
provided with a stop pin 52 to limit rotation of the latch 14 relative to the toroidal
connector 12. The member 46 may be anchored to the bush 48. With reference to
Figure 6, the member 46 may be in the form of a rivet which passes through the bush
48 and has a flange at each end to retain the rivet relative to the bush 48. Alternatively,
the member may be in the form of a roll pin.
In this way, there is provided a tamper evident centre bush 48. The bush 48 may be
profiled to match the loops 24, 26, the bush 48 being d by either a rivet or a roll
pin that does not pass through the middle of the axle pin 28 but passes tially
through the groove 50 on the axle pin 28. If secured by a rivet, the rivet will be deformed
to secure it and the deformed end may have a branded logo (see Figure 5 and Figure
7) to indicate the handle (coupler 16) has not been tampered with. If a roll pin is used,
then a seal (possibly in the form of epoxy or solder) may be used to te the clutch
has not been disassembled.
As will be appreciated from the drawings, the bush 48 has a non-cylindrical shape. The
locking pin or rivet 46 runs tangentially through the groove 50 in the axle pin 28.
Accordingly, this provides an tion to the user that the clutch 10 has not been
tampered with since proof testing. The applicant has identified that a commercial
hammerlock can be disassembled and reassembled without it being evident that this
has happened. Therefore, the original proof testing and certification could be d as
this must be conducted anytime the clutch is modified.
Advantageously, the incorporation of a tamper evident feature gives the user confidence
that the clutch 10 has not been tampered with since proof testing. The unique shape of
the bush 48 allows the rivet or cross pin 46 to hold the axle 28 by the groove 50 rather
than passing the centre of the axle 28. This creates far less stress concentration, making
the axle 28 stronger. The unique shape of the bush 48 also allows the use of the tamper
evident rivet 46. The tangentially positioned groove 50 allows for easier assembly of the
system compared to that of a centrally located hole as less alignment is required (that
is, alignment is only required in the x-axis and not in both x and y axes).
Turning now to Figures 10 to 13, the toroidal connector 12 may be provided with a
circular seat 54 for sitting upon a circular upper surface 56 of a head 58 of an anchor
60 coupled to the toroidal connector 12. The ar seat 54 terminates in a radial
bearing surface 62 for o-face abutment with a castellation 64 of the anchor 60.
As can be seen most clearly in Figure 13, the ar seat 54 has a first radial bearing
surface 62 for abutment with a first castellation 64 of the anchor and a second, opposite,
radial bearing surface 62 for abutment with a second castellation 64 of the anchor 60.
In the example shown, the ar seat 54 is ar about an arc 66 having a centre
at a central longitudinal (tangential) axis 68 of the latch 14. More specifically, the radial
bearing surface 62 is radial relative to a circle having a centre at the central longitudinal
axis 68 of the latch 14.
Advantageously, the provision of the radial bearing surfaces 62 improve the ace
of the toroidal connector 12 and the anchor 60, when ed with existing connectors
which abut at an edge or point. The applicant has identified that the face-to-face
bearing provides less re owing to the greater surface area of contact, reducing
wear on the toroidal connector 12. In particular, the applicant has identified that
previous clutch designs for castellated anchors would see the sides of the torus bear on
the castellations (or in a point or line contact where the sides of the torus meet the
curved cut out). In the example of the invention shown, a new angled face cts
with the angled face of the anchor 60 to achieve a far r bearing area resulting in
less wear on the torus over time. This is achieved by way of the angled faces on the
toroidal connector 12 which bear against the castellations 64 on the head 58 of the
anchor 60. This is in contrast to ng arrangements where a toroidal connector bears
on flat faces of the anchor or, where the anchor is castellated, the sides of the torus
bear on the castellations.
With reference to Figures 15 to 18, there is shown an alternative example of the present
invention in which the locking ring handle 30 is arranged to abut the coupler 16 to limit
rotational movement of the coupler 16 relative to the toroidal connector 12. In
particular, the locking ring handle 30 is ed to limit rotational movement of the
coupler 16 relative to the toroidal connector 12 such that the limit prevents a tip 42 of
the locking ring handle 30 passing through an inner loop 26 of the coupler 16. This may
be achieved by dimensioning the locking ring handle 30 such that the tip 42 of the
locking ring handle 30 extends radially further from a centre of the toroidal connector
12 than an outermost edge of the coupler 16.
g to Figures 19 to 22, there is shown an example of the present invention in which
the coupler 16 is arranged to limit pivotal movement of the second part 22 ve to
the first part 20 in two directions. More specifically, as can be seen in Figure 19, the
first part 20 is connected to the second part 22 by a pivotal coupling 70. In the example
shown, the pivotal coupling 70 es a first hinge 72 at one side of the r 16
and a second hinge 74 at an te side of the coupler 16. As can be seen, the first
hinge 72 and the second hinge 74 are arranged to provide pivotal movement of the
second part 22 relative to the first part 21 along a common axis which may be ensured
by a single axle pin 28.
In the example shown in Figures 19 to 22, the pivotal coupling 70 includes a bush 48
between the first hinge 72 and the second hinge 74. The bush 48 includes a stop 76 for
abutting against the first part 20 or the second part 22 to limit rotation of the second
part 22 relative to the first part 20. The bush 48 may be arranged to rotate with the
second part 22 (for example, engaged with the second part 22 by way of a tongue and
groove connection) and the stop 76 may be adapted to abut against the first part 20 to
limit rotation of the second part 22 relative to the first part 20.
Figure 20 shows an enlarged and ed view of the portion ed "B" in Figure 19.
In Figure 20 it can be seen that the first part 20 is provided with a tab 78 for abutment
with the stop 76.
Figure 21 shows a front view of the coupler 16, and Figure 22 shows an enlarged and
detailed view of the cross-section labelled A-A in Figure 21. With reference to Figure 22,
the stop 76 may be in the form of a cutout 80 having two stop surfaces, comprising a
first stop surface 82 for abutting one side of the tab 78 and a second stop e 84
for ng an opposite side of the tab for ng rotation of the second part 22 relative
to the first part 20 in two ions.
Advantageously, this ement enables the ng of angular movement of the
second part 22 relative to the first part 20 in two directions and avoids a weakness
which may otherwise be incurred if the limiting mechanism is attempted to be achieved
within the first hinge 72 and/or the second hinge 74. The arrangement shown in Figures
19 to 22 takes advantage of there being no load or only little load on the coupler 16
when the rotation limiting mechanism is required to perform its duty. In other words,
the arrangement shown in Figures 19 to 22 changes how rotation of the upper loop
relative to the lower loop is achieved. In this revised version, this limitation of on
is achieved between radial shoulders in the centre bush 48 that limit the movement of
a lug or tab on the inside of the lower loop.
The revised arrangement limits rotation in both directions, not just one direction. It will
be understood by those skilled in the art that the two directions may be different (for
example, in magnitude of limitation), thereby preventing the large loop – the second
part – from interacting with the locking ring handle while allowing extra rotation in the
opposite direction. This revised arrangement works between the lower loop – the first
part 20 – and the centre bush 48, where the centre bush 48 is keyed to the upper bush
to maintain alignment with the upper loop.
While various embodiments of the present invention have been described above, it
should be understood that they have been presented by way of e only, and not
by way of limitation. It will be apparent to a person skilled in the relevant art that
various s in form and detail can be made therein without departing from the
spirit and scope of the invention. Thus, the present ion should not be limited by
any of the above described exemplary embodiments.
The reference in this ication to any prior publication (or information derived from
it), or to any matter which is known, is not, and should not be taken as an
acknowledgment or admission or any form of suggestion that that prior publication (or
information derived from it) or known matter forms part of the common general
knowledge in the field of endeavour to which this specification relates.
List of features:
Clutch
12 Toroidal connector
14 Latch
16 Coupler
18 Lifting tus
First part
22 Second part
24 First loop
26 Second loop
28 Axle pin
Handle of the latch
32 First ar arc
34 Second circular arc
36 Line
38 Centre of the first arc
40 Centre of the second arc
42 Tip of the locking ring handle
44 Shoulder
46 Tamper evident indicator
48 Bush
50 Circular groove
52 Stop pin
54 Circular seat
56 Circular upper surface
58 Head
60 Anchor
62 Radial bearing surface
64 Castellation
66 Arc
68 Central longitudinal axis of the latch
70 Pivotal coupling
72 First hinge
74 Second hinge
76 Stop
78 Tab
80 Cutout
82 First stop surface
40 84 Second stop surface
Claims (4)
1. A clutch for lifting a te component, including a toroidal connector, a latch movable relative to the toroidal connector between a disengaged condition and an engaged condition, and a coupler for coupling the toroidal connector to a lifting apparatus, wherein the toroidal connector has a ar seat for sitting upon a circular upper surface of a head of an anchor coupled to the toroidal connector, wherein the circular seat terminates in a radial bearing e for abutment with a castellation of the anchor.
2. A clutch as claimed in claim 1, wherein the circular seat has a first radial bearing surface for abutment with a first castellation of the anchor and a second, opposite, radial bearing e for nt with a second castellation of the anchor.
3. A clutch as claimed in claim 1 or claim 2, wherein the circular seat is circular about an arc having a centre at a l longitudinal axis of the latch.
4. A clutch as claimed in claim 3, wherein the radial bearing surface is radial relative to a circle having a centre at the central longitudinal axis of the latch. A clutch for lifting a concrete component, including a toroidal tor, a latch movable 5 relative to the toroidal connector between a disengaged condition and an engaged condition, and a coupler for coupling the toroidal connector to a lifting tus, wherein the toroidal connector has a circular seat for sitting upon a circular upper surface of a head of and anchor coupled to the toroidal connector, wherein the circular seat terminates in a radial bearing surface for nt with a castellation of the 10 anchor. 12
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2021205061 | 2021-07-14 | ||
AU2022204593 | 2022-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ790128A true NZ790128A (en) | 2022-07-29 |
Family
ID=
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