NZ599514B - Rigging for vehicles - Google Patents
Rigging for vehicles Download PDFInfo
- Publication number
- NZ599514B NZ599514B NZ599514A NZ59951412A NZ599514B NZ 599514 B NZ599514 B NZ 599514B NZ 599514 A NZ599514 A NZ 599514A NZ 59951412 A NZ59951412 A NZ 59951412A NZ 599514 B NZ599514 B NZ 599514B
- Authority
- NZ
- New Zealand
- Prior art keywords
- boom
- slider
- spigot
- portions
- body portion
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract description 51
- 238000005452 bending Methods 0.000 claims description 37
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 15
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 15
- 238000005520 cutting process Methods 0.000 claims description 6
- 230000000875 corresponding Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 description 8
- 239000002965 rope Substances 0.000 description 5
- 238000003698 laser cutting Methods 0.000 description 3
- 230000037250 Clearance Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 230000035512 clearance Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 206010022114 Injury Diseases 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminum Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/38—Making other particular articles locksmith's goods, e.g. handles
- B21D53/40—Making other particular articles locksmith's goods, e.g. handles hinges, e.g. door hinge plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H9/00—Marine propulsion provided directly by wind power
- B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
- B63H9/08—Connections of sails to masts, spars, or the like
- B63H2009/086—Connections of sails to masts, spars, or the like by sliders, i.e. by shoes sliding in, or guided by channels, tracks or rails; for connecting luffs, leeches, battens, or the like to masts, spars or booms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H9/00—Marine propulsion provided directly by wind power
- B63H9/04—Marine propulsion provided directly by wind power using sails or like wind-catching surfaces
- B63H9/08—Connections of sails to masts, spars, or the like
- B63H9/10—Running rigging, e.g. reefing equipment
Abstract
Patent 599514 A slider shoe fitting for a gnav assembly for exerting a downward force on a boom. The slider shoe fitting comprises a boom slider (10) for sliding along an upper portion of a surface of a boom, and a strut portion for forming at least part of a strut of the gnav assembly. The boom slider comprises a body portion (11) and a plurality of upstanding portions (15). The body portion and upstanding portions are of a single piece of material. The strut portion is pivotally mounted to the plurality of upstanding portions. m slider comprises a body portion (11) and a plurality of upstanding portions (15). The body portion and upstanding portions are of a single piece of material. The strut portion is pivotally mounted to the plurality of upstanding portions.
Description
NEW ZEALAND
S ACT, 1953
TE SPECIFICATION
RIGGING FOR VEHICLES
We, RIVER SAILING DINGHIES LIMITED, 21 British company of 46 Grandison Road,
London SW11 6LW, United Kingdom, do hereby declare the invention for which we pray that a
patent may be granted to us, and the method by which it is to be performed, to be particularly
described in and by the following statement:
RECEIVED at IPONZ on 31 August 2012
RIGGING FOR VEHICLES
This invention relates to rigging for vehicles with sails such as dinghies,
and in ular to gnav assemblies and slider shoe fittings of gnav
assemblies for use as part of such g. A gnav assembly is a
mechanism for exerting a downward force on a boom of a vehicle and
comprises means movable along the boom and a strut pivotally
connectable to the e means and a mast. Such mechanisms may
be used in place of vang systems or g straps, which comprise ropes
10_ or isms located below the boom for pulling the boom downwards.
According to one aspect of the present invention there is provided a slider
shoe fitting for a gnav assembly for exerting a rd force on a boom;
the slider shoe fitting comprising a boom slider for sliding along an
upper portion of a surface of a boom, and a strut portion for forming at
least part of a strut of the gnav assembly;
wherein the boom slider comprises a body portion and a ity of
upstanding portions, the body portion and upstanding portions being of a
single piece of material;
wherein the boom slider is made from sheet material;
and wherein the strut portion is pivotally mounted to the plurality of
upstanding portions.
Preferably the boom slider is made from stainless steel.
The upstanding portions may be created by providing cuts in the sheet
material and bending material portions defined by the cuts about a '
bending line. The sheet al may comprise cut-outs. The body
portion may define a longitudinal axis along its length, and the bending line
may be d with the longitudinal axis. The body portion may comprise
a central portion along the longitudinal axis, and the bending line maybe
RECEIVED at IPONZ on 31 August 2012
located away from the l portion, towards an edge of the body
portion.
The bending line may be located on the body portion such that it is lower
than an uppermost n ofthe underside of the boom slider.
The cuts provided in the sheet material may be provided by water jet
cutting. atively, the cuts provided in the sheet material may be
provided by laser cutting.
There may be an enlarged cut adjacent the bending line of the upstanding
portions for stress relief. The cuts provided in the sheet material may be
arranged such that an edge portion of an upstanding n adjacent the
bending line is substantially perpendicular to the bending line. This may
facilitate bending of the upstanding portion.
ably, there are two upstanding portions. The ding portions
may be located either side of the central portion. The upstanding portions
may be arranged opposite to one another. The upstanding portions may
be located equidistant from the central n.
The upstanding portions may be spaced apart from each other by at least
one third of the width ofthe boom slider. Preferably, the upstanding
portions are spaced apart from each other by at least half of the width of
the boom slider. Preferably, the upstanding portions are spaced apart
from each other by at least two thirds of the width of the boom slider.
Preferably, the upstanding portions are located centrally along the length
of the boom slider.
RECEIVED at IPONZ on 31 August 2012
The upstanding portions may comprise creases across the bending line for
strengthening the upstanding portions. The upstanding portions may be
generally triangular in shape, with an apex of the triangle oriented away
from the body portion of the boom slider. Each upstanding portion may
comprise an aperture for mounting the strut to the boom slider. The
apertures may be located towards the apex of the upstanding portions.
The ide of the body portion may be smoothly curved. The
ide of the body portion may be free from engagement portions to
hold it on a boom. The underside of the body portion may have a part-
circular cross-section. Alternatively, the underside of the body portion may
have a part-oval cross—section.
The underside of the body portion may have a shape ponding to the
upper portion of a surface of a boom. In this context, this can include the
underside of the body portion having a radius of curvature equal to, or
slightly larger than, a radius of curvature of the upper portion of a surface
of a boom. In other words, the boom slider fits onto a boom, but there
may be some tolerance in the fit.
The underside of the body portion may be provided with at least one strip
of PTFE material for reducing friction between the boom slider and the
boom, wherein one side of the strip of PTFE al may be etched,
facilitating the adherence of the strip of PTFE material to the underside of
the body n. The strip of PTFE material may be aligned with the
udinal axis of the body portion.
The strip of PTFE material may be ed away from an uppermost
portion of the underside of the body portion. Thus there may be a
clearance between the uppermost portiOn of the underside of the body
RECEIVED at IPONZ on 31 August 2012
portion and the upper portion of a surface of a boom on which the slider is
fitted.
The boom slider may comprise rounded corners.
The body portion may comprise an integral mounting portion for a pulley.
The integral mounting portion may be d towards an end of the body
portion, along its longitudinal axis. The mounting n may se a
portion of the body portion bent relative to the remainder of the body
portion. The mounting portion may be bent away from the underside of
the body portion. The mounting portion may comprise at least one
aperture for mounting a pulley.
The strut portion may be a spigot to which a strut member is mountable to
form the strut. In such a case said strut member will typically be a hollow
tubular member such as an ium shaft. The strut portion may
comprise the complete strut.
The spigot may comprise a spigot body portion defining a spigot
longitudinal axis and a plurality of spigot ng portions for mounting
the spigot to the boom slider, which spigot mounting portions are laterally
spaced from the spigot longitudinal axis.
The spigot mounting portions may be mounted to the upstanding portions
by a bolt. Washers may be provided between the spigot mounting
ns and the upstanding portions to absorb shock. The shock
absorbing s may be made of nylon.
The spigot may comprise at least one cutaway portion adjacent the spigot
mounting portions which enables a greater relative pivoting between the
spigot and the boom slider than would othen/vise be possible.
RECEIVED at IPONZ on 31 August 2012
The spigot may comprise at least one recess portion d adjacent the
spigot mounting portions which enables the spigot to be mounted to the
boom slider such that the spigot mounting portions are closer to the boom
slider body portion than would othenivise be possible. The spigot
mounting portions may protrude into the cut-outs of the boom slider.
According to another aspect of the present invention there is provided a
gnav assembly having a strut for exerting a rd force on a boom,
the gnav assembly comprising a slider shoe fitting, the slider shoe fitting
comprising a boom slider for g along an upper portion of a surface of
a boom, and a strut portion which forms at least part of the strut in the
gnav assembly, wherein the boom slider comprises a body portion and a
plurality of upstanding portions, the body portion and upstanding ns
being of a single piece of material, wherein the boom slider is made from
sheet material, and wherein the strut portion is lly d to the
plurality of upstanding portions.
The gnav assembly typically comprises a mast end toggle for pivotal
mounting of the gnav assembly to a mast.
The slider shoe fitting of said other aspect may comprise any one of, or
any combination of, the additional features described above in relation to
the slider shoe fitting mentioned as part of said one aspect defined above.
According to yet another aspect of the present invention there is provided
rigging for a vehicle, the rigging comprising a mast, a boom and a gnav
assembly having a strut for ng a downward force on the boom, the
gnav'assembly comprising a slider shoe fitting, the slider shoe fitting
comprising a boom slider for sliding along an upper portion of a e of
the boom, and a strut portion which forms at least part of the strut in the
RECEIVED at IPONZ on 31 August 2012
(followed by 7a)
gnav assembly, wherein the boom slider comprises a body portion and a
ity of upstanding portions, the body portion and ding portions
being of a single piece of al, wherein the boom slider is made from
sheet material, and wherein the strut portion is pivotally mounted to the
plurality of upstanding portions; wherein an underside of the body portion
has a shape corresponding to an upper portion of the surface of the boom.
The gnav assembly typically comprises a mast end toggle for pivotal
mounting of the gnav assembly to the mast.
The slider shoe fitting of said yet another aspect may comprise any one of,
or any combination of, the additional features described above in relation
to the slider shoe fitting mentioned as part of said one aspect defined
above.
ing to a further aspect of the present invention there is provided a
method of making a boom slider comprising the steps of:
cutting a flat sheet of material;
bending at least two portions of the material away from the sheet
material, towards the same side of the sheet, to form upstanding portions;
bending the sheet material so that it curves away from the
upstanding portions so as to have a shape corresponding to an upper
portion of a surface of a boom; and
introducing creases at the join between the upstanding portions and
the bent sheet al to then the upstanding portions.
The method may comprise the step of bending the sheet material so that
an underside curves ly.
The sheet material may be cut using a waterjet. The sheet material may
be cut using a laser.
RECEIVED at IPONZ on 31 August 2012
(followed by 8)
The term 'comprising' as used in this specification and claims means
'consisting at least in part of‘. When interpreting statements in this
specification and claims which include the term ising', other features
besides the features prefaced by this term in each statement can also be
present. Related terms such as 'comprise' and 'comprised' are to be
interpreted in r manner.
RECEIVED at IPONZ on 31 August 2012
Embodiments of the present invention will now be described by way of
example only with reference to the accompanying drawings in which:
Figure 1 tically shows rigging for a sailing e;
Figure 2 is a ctive view of part of a gnav assembly — a slider shoe
fitting- of the rigging shown in Figure 1;
Figures 3a and 3b are ctive views of part of the gnav assembly
shown in Figure 2;
Figure 4 is a top view of the part of the gnav assembly shown in Figures
3a and 3b;
Figure 5 is a side view of the part of the gnav assembly shown in Figures
3a and 3b;
Figure 6 is a perspective view of a different part of the gnav assembly
shown in Figure 2;
Figure 7 is a side view of the different part of the gnav ly shown in
Figure 6; and
Figure 8 is a perspective view of part of the gnav assembly shown in
Figure 2 showing a further development.
Figure 1 shows a sailing vehicle 1 comprising a hull 2. Rigging is provided
on the hull 2. The rigging comprises a mast 4 and a boom 5. The mast 4
is provided generally upstanding from the hull 2 and the boom 5 is
pivotally connected to the mast 4 about a pivot joint 6. Sails 7 are
supported by the mast 4.
A gnav assembly 8 is provided between the mast 4 and the boom 5 for
exerting a downward force on the boom 5. This allows greater control of
the sail 7. The gnav assembly comprises a strut 9 with a fixed length.
The gnav assembly comprises a slider shoe fitting, the slider shoe fitting
comprising a boom slider 10 for sliding along an upper portion ofa surface
of the boom 5 and a strut portion. In this embodiment, the strut portion
RECEIVED at IPONZ on 31 August 2012
comprises a spigot 21 (see figure 2). An aluminium tubular member is
mounted to the spigot to form the strut 9.
A first end of the strut 9 is pivotally mounted to the mast 4 by a standard
mast end toggle about a mounting point 3. A second end of the strut 9 is
pivotally mounted to the boom slider 10 via the spigot 21. The boom slider
is ed so that it can slide along an upper portion of the surface of
the boom 5 towards and away from the mast 4, i.e. along at least part of
the length of the boom 5.
Thus, as the boom slider 10 slides along the upper portion of the surface
of the boom 5 towards the mast 4, the boom 5 will tend to move/be
pushed downwards. In one embodiment, control of the boom slider 10 is
ed by means of a pulley (not shown) mounted to the boom slider 10;
a rope passing h the pulley allows the boom slider 10 to be drawn
s the mast 4.
In alternative embodiments, a pulley may be mounted to the strut portion.
In yet other embodiments, the strut portion may comprise an aperture for
receiving a rope, allowing the boom slider to be drawn towards the mast.
When the sailing boat 1, orthe wind, changes directions, the boom 5 may
pivot about the pivot joint 6 and move sideways relative to the hull 2.
When the boom 5 reaches the end of its motion, it may experience a sharp
decelerating force resulting in a ys shock force to the boom slider
which may tend to cause the boom slider 10 to experience a torque
about the boom 5. Various features of the t apparatus have been
developed with this in mind, and will be described in more detail below.
More detail of the boom slider 10 is described below with reference to
Figures 2 to 5. As will become apparent from the drawings and the
RECEIVED at IPONZ on 31 August 2012
following ption, the boom slider 10 is made of a piece of sheet metal
which has been cut and bent into shape. In one embodiment the boom
slider is made from stainless steel, although other suitable materials may
be used. The boom slider 10 has rounded corners. Since the boom slider
is located on the boom 5 in use, the provision of rounded s
serves to reduce the likelihood of injury should the boom slider 10 contact
a person, and also reduces the hood of the boom slider 10 catching
an edge whilst sliding along the boom 5.
Referring to figure 2, the boom slider 10 comprises a rically curved
body portion 11. The concave side of the body portion 11 is its underside
12. The boom slider 10 further comprises a central n 13. The boom
slider 10 has a longitudinal axis 14 aligned along the length of the body
portion 11 of the boom slider 10. The longitudinal axis 14 is aligned with
the central portion 13 (see figure 4).
As can best be seen from Figure 5, the underside 12 of the boom slider 10
is smoothly curved. The underside 12 of the boom slider 10 does not
comprise any engagement portions to hold it in place on a boom 5. The
boom slider 10 is designed for use with a boom with no protruding or
recessed engagement features on its curved surfaces.
Modern lightweight booms are typically made from carbon fibre and may
have ar or oval cross-sections and generally no surface features. In
this ment the boom slider 10 has a part circular cross-section so as
to correspond to the upper portion of the surface of a boom 5 with a
circular cross-section. in alternative embodiments, the boom slider 10
may have differing ure, for example a part-oval cross—section so as
to correspond to a boom with an oval cross-section. In some
embodiments the boom slider 10 may have a radius of curvature slightly
larger than that of the boom, such that limited lateral movement is
RECEIVED at IPONZ on 31 August 2012
le. This may reduce the sideways stress or shock on the boom
slider 10.
Strips of PTFE material 32 are provided on the underside 12 of the boom
slider 10. The strips of PTFE material 32 extend longitudinally along the
length of the boom slider 10, as can be seen in Figure 3b. The provision
of the strips of PTFE material 32 facilitate easy g of the boom slider
along the boom 5. Prior to adhering the strips of PTFE al 32 to
the underside 12 of the boom slider 10, one side of the strips of PTFE
material 32 is etched so as to provide an appropriate surface for adhering
to the boom slider 10.
In other ments there may not be a strip of PTFE material at an
uppermost portion of the underside of the body portion. Thus there may
be a clearance between the uppermost n of the underside of the
body portion and the upper portion of a surface of a boom, thus helping to
avoid grit under the boom slider 10 that is pushed to the top of the
underside of the body portion affecting the sliding of the boom slider 10.
The boom slider 10 further comprises two ding portions 15. The
upstanding portions 15 comprise generally triangular portions which are
bent away from the body portion 11 along a bending line 16. The
upstanding portions 15 are connected to the body portion 11 along the
bending line 16.
The bending line 16 is aligned along the length of the boom slider 10 such
that the bending line 16 is parallel to the longitudinal axis 14. A crease 17
is ed in the bending line 16. In this embodiment the crease 17 is
provided at the midpoint of the bending line 16, and is perpendicular to the
bending line 16. The provision of the crease 17 strengthens the
RECEIVED at IPONZ on 31 August 2012
upstanding portions 15 and s the likelihood of the upstanding
portions 15 flexing about the bending line 16.
The ding portions 15 are bent away from the body portion 11 of the
boom slider 10 such that two cut-outs 18 remain in the body portion 11.
The cut—outs 18 are located at a midpoint along the length of the boom
slider 10. One cut-out is located to each side of the central portion 13.
The l portion 13 narrows due to the location of the two cut-outs 18,
as can best be seen from figure 4.
The upstanding portions 15 comprise mounting means. Referring to figure
3a, the mounting means comprises an aperture 19 provided towards an
apex of each triangular upstanding portion 15 that is away from the
bending line 16.
There are two upstanding portions 15 which are provided at a midpoint
along the length of the boom slider 10. Providing the upstanding ns
at this location on the boom slider 10 improves the stability of the gnav
assembly 8 in use.
The bending lines 16, and hence the tive upstanding portions 15,
are located either side of the longitudinal axis 14 of the boom slider 10.
Providing the upstanding portions 15 spaced lly from the longitudinal
axis 14 in this way improves the stability of the gnav assembly in use. The
upstanding portions 15 are provided opposite one another and are
generally parallel such that the re 19 in one upstanding portion 15 is
aligned with the aperture 19 in the other upstanding portion 15.
As can be seen from Figure 5, the bending line 16 is provided at a n
of the body portion 11 of the boom slider 10 that is below the uppermost
part of the underside 12 of the boom slider 10.
RECEIVED at IPONZ on 31 August 2012
Locating the mounting means of the boom slider 10 closer to the boom 5
reduces the potential torque applied to the boom slider 10 in use. This
therefore increases the ity of the gnav ly 8.
As mentioned above, the boom slider 10 is formed by g sheet
material and bending it into shape. Cuts are made in the sheet material to
define edges forthe upstanding ns 15. The cuts may be made by
et cutting, laser cutting, or other appropriate cutting methods.
An enlarged cut 20 is made at either end of the cut made in the sheet
material (see figure 2). The enlarged cut 20 provides a stress-relieving
portion when the upstanding portions 15 are bent away from the sheet
material. This results in material under a lower resulting strain, and hence
improves the stability of the boom slider 10.
In this embodiment, the enlarged cut 20 is made such that an end portion
of the cut is generally perpendicular to the bending line 16. This facilitates
the bending of the upstanding portions 15 about the bending lines 16.
The spigot 21 will now be further described, with reference to Figures 6
and 7.
The spigot 21 comprises a spigot body 22. The spigot body 22 is
generally cylindrical and defines a spigot longitudinal axis 23 along the
length ofthe spigot body 22. A first end 24 of the spigot body 22 has an
outer er adapted to fit within a hollow end of the strut member 91.
The spigot 21 is riveted to the strut member 91. In other embodiments,
alternative attachment means may be used. A second end 25 of the
spigot 21 comprises spigot mounting portions 26.
RECEIVED at IPONZ on 31 August 2012
Referring to figure 7b, there are two spigot ng portions 26. The
spigot mounting portions are ed offset from the spigot longitudinal
axis 23. The spigot mounting portions 26 are provided on opposite sides
of the spigot 21.
The spigot mounting portions 26 comprise an aperture 29 for receiving a
bolt 30. The bolt 30 passes through both of the spigot mounting ns
26, as can be seen from Figure 2.
The bolt 30 mounts the spigot mounting portions 26 to the upstanding
portions 15 of the boom slider 10.
When the spigot 21 is mounted to the boom slider 10, the bolt 30 passes
through the aperture 19 in one of the upstanding portions 15, through the
aperture 29 in the spigot mounting portions 26 and through the aperture
19 in the other ding portion 15.
Respective washers 31 are provided between the spigot mounting portion
26 and the respective ding portions 15 (see figure 2). Each washer
31 is made from nylon, and s some of the shock on the boom slider
that occurs at the end of lateral travel of the boom 5. This reduces the
shock transferred to the rest of the gnav assembly 8. This shock
tion assists in maintaining the stability of the gnav assembly 8.
In other embodiments, respective washers may be provided on the outside
of the respective upstanding portions 15 in addition to or in alternative to
being provided on the inside of the respective upstanding portions 15.
This may reduce the shock transferred to the rest of the gnav assembly 8.
In this way the spigot 21 is pivotally mounted to the boom slider 10 and
may pivot about the axis of the bolt 30. As the boom slider 10 slides along
RECEIVED at IPONZ on 31 August 2012
the boom 5 towards or away from the mast 4, the spigot 21 will pivot
relative to the boom slider 10.
Respective cut-away portions 27 are provided s the second end 25
of the spigot 21. As can be seen from Figure 7a there are two cut-away
portions 27, one provided each side of the second end 25 of the spigot 21,
between the spigot mounting portions 26.
The cut-away portions 27 facilitate the pivoting of the spigot 21 relative to
the boom slider 10. As the spigot 21 pivots in one direction relative to the
boom slider 10, the second end 25 of the spigot 21 will get closer to the
boom slider 10. When the spigot 21 contacts the boom slider 10, the
spigot 21 will not pivot further in that ion. Providing cut-away
portions 27 extends the range of l motion of the spigot 21 relative to
the boom slider 10. The ay portions 27 also enable the range of
pivotal motion of the spigot 21 relative to the boom slider 10 to be
maintained as the axis about which the spigot pivots, i.e. that of the bolt
, is made to be closer to the body portion 11 of the boom slider 10.
Hence the provision of the cut-away portions 27 tates the increased
stability of the boom slider 10 by allowing the apertures 19 to be provided
closer to the body portion 11 whilst maintaining the range of pivotal motion
of the spigot 21 relative to the boom slider 10.
The second end 25 of the spigot 21 further comprises a recess portion 28
(see figure 7b). The recess portion 28 is located between the two spigot
mounting portions 26. The recess portion 28 comprises a curved portion.
In alternative embodiments the recess portion 28 may be shaped
differently.
RECEIVED at IPONZ on 31 August 2012
The recess portion 28 is arranged such that the narrow portion of the
central portion 13 is able to be received into the recess portion 28. The
spigot mounting portions 26 will then protrude into the cut-outs 28. The
provision of the recess portion 28 thus enables the res 19 on the
upstanding portions 15 to be located closer to the body n 11, which
results in a more stable gnav assembly 8 as mentioned above.
Figure 8 shows a boom slider 10 of another embodiment. In this
embodiment, the boom slider 10 comprises an integral ng portion,
but othenNise the gnav assembly of this embodiment will be the same as
above. The integral mounting portion comprises a front upstanding portion
33. The front upstanding portion 33 is located on the body portion 11 of
the boom slider 10, towards an end of the boom slider 10. In use, the front
upstanding portion 33 is located at the end of the boom slider 10 which
faces the mast 4.
The front upstanding portion 33 comprises an aperture 34 for mounting a
pulley (not . A rope (not shown) passing through the pulley
enables the boom slider 10 to be drawn towards the mast 4. Providing
slack in the rope allows the boom slider 10 to move away from the mast 4.
The front upstanding portion 33 is d on the longitudinal axis 14 of the
boom slider 10. This enables the boom slider 10 to be drawn towards the
mast 4 without ucing a twisting force.
In this embodiment, the front upstanding portion 33 comprises a ular
portion cut out of the body portion 11 of the boom slider 10. Cuts defining
the front upstanding portion 33 may be provided by waterjet cutting or by
laser cutting.
The front upstanding portion 33 is bent about a bending line located
towards the end of the boom slider 10. In alternative embodiments, the
RECEIVED at IPONZ on 31 August 2012
front upstanding portion 33 may be bent about a bending line located
away from the end of the boom slider 10. In the embodiment shown in
Figure 8, the axis of the aperture 34 for mounting the pulley generally
faces the mast 4. It is envisaged that, in other embodiments, the axis of
the re 34 for mounting the pulley may be generally upright.
RECEIVED at IPONZ on 31 August 2012
Claims (21)
1. A slider shoe fitting for a gnav assembly for exerting a downward force on a boom; the slider shoe fitting comprising a boom slider for sliding along an upper portion of a surface of a boom, and a strut portion for forming at least part of a strut of the gnav assembly; wherein the boom slider comprises a body portion and a plurality of upstanding portions, the body portion and upstanding portions being ofa 10 single piece of material; wherein the boom slider is made from sheet material; and wherein the strut portion is lly mounted to the plurality of upstanding portions. 15
2. A slider shoe fitting according to claim 1 in which the upstanding ns have been created by providing cuts in the sheet material and bending al portions defined by the cuts about a g line.
3. A slider shoe fitting according to claim 1 or claim 2 in which the 20 sheet material comprises cut—outs.
4. A slider shoe fitting according to claim 2 or claim 3 in which the body portion defines a udinal axis along its length, and the bending line may be aligned with the longitudinal axis.
5. A slider shoe fitting ing to claim 4 in which the bending line is located on the body portion such that it is lower than an uppermost portion of the underside of the boom slider. 30
6. A slider shoe fitting according to claim 4 or claim 5 in which the cuts provided in the sheet material are arranged such that an edge portion of RECEIVED at IPONZ on 31 August 2012 an upstanding portion adjacent the bending line is substantially perpendicular to the bending line.
7. A slider shoe fitting according to any one of claims 4 to 6 in which the ding ns comprise creases across the bending line for strengthening the upstanding portions.
8. A slider shoe fitting according to any preceding claim in which the upstanding portions are located centrally along a length of the boom slider.
9. A slider shoe fitting according to any ing claim in which the underside of the body portion is free from engagement portions to hold it on a boom. 15
10. A slider shoe fitting according to any preceding claim in which the underside of the body portion has a shape corresponding to the upper portion of a surface of a boom.
11. A slider shoe fitting according to any preceding claim in which the 20 underside of the body portion is provided with at least one strip of PTFE material for reducing on between the boom slider and the boom, wherein one side of the strip of PTFE material may be etched, facilitating the nce of the strip of PTFE material to the underside of the body portion.
12. A slider shoe fitting according to claim 11 in which the strip of PTFE al is provided away from an uppermost portion of the underside of the body portion. RECEIVED at IPONZ on 31 August 2012
13. A slider shoe fitting according to any preceding claim in which the strut portion comprises a spigot to which a strut member is mountable to form the strut.
14. A slider shoe fitting according to claim 13 in which the spigot comprises a spigot body n g a spigot longitudinal axis and a plurality of spigot mounting portions for mounting the spigot to the boom slider, which spigot mounting portions are laterally spaced from the spigot longitudinal axis.
15. A slider shoe fitting according to claim 14 in which the spigot ses at least one cutaway portion adjacent the spigot mounting portions which enables a greater relative pivoting between the spigot and the boom slider than would otherwise be possible.
16. A slider shoe fitting according to claim 14 or claim 15 in which the spigot comprises at least one recess portion located adjacent the spigot ng portions which enables the spigot to be mounted to the boom slider such that the spigot mounting portions are closer to the boom slider 20 body portion than would otherwise be le.
17. A slider shoe fitting according to any one of claims 14 to 16 in which the spigot mounting portions protrude into the cut-outs of the boom slider. 25
18. A gnav assembly having a strut for exerting a downward force on a boom, the gnav assembly comprising a slider shoe fitting, the slider shoe fitting comprising a boom slider for sliding along an upper portion of a surface of a boom, and a strut portion which forms at least part of the strut in the gnav assembly, wherein the boom slider comprises a body portion 30 and a plurality of upstanding portions, the body portion and upstanding ns being of a single piece of material, wherein the boom slider is ED at IPONZ on 31 August 2012 made from sheet material, and wherein the strut portion is pivotally mounted to the plurality of upstanding portions.
19. Rigging for a vehicle, the rigging comprising a mast, a boom and a gnav assembly having a strut for exerting a rd force on the boom, the gnav assembly comprising a slider shoe fitting, the slider shoe fitting comprising a boom slider for sliding along an upper portion of a surface of the boom, and a strut portion which forms at least part of the strut in the gnav assembly, wherein the boom slider ses a body portion and a 10 plurality of upstanding portions, the body portion and upstanding portions being of a single piece of material, wherein the boom slider is made from sheet material, and wherein the strut portion is pivotally mounted to the plurality of upstanding portions; wherein an underside of the body portion has a shape corresponding to an upper portion of the surface of the boom.
20. A method of making a boom slider comprising the steps of: cutting a flat sheet of material; g at least two portions of the material away from the sheet material, towards the same side of the sheet, to form ding portions; 20 bending the sheet material so that it curves away from the upstanding portions so as to have a shape corresponding to an upper portion] of a surface of a boom; and introducing s at the join between the upstanding portions and the bent sheet material to strengthen the upstanding portions.
21. A slider shoe fitting substantially as hereinbefore described with nce to and as rated in the accompanying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1106959.8 | 2011-04-21 | ||
GB1106959.8A GB2490174B (en) | 2011-04-21 | 2011-04-21 | Rigging for vehicles |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ599514A NZ599514A (en) | 2012-10-26 |
NZ599514B true NZ599514B (en) | 2013-01-29 |
Family
ID=
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