NZ770589A - Transmissions incorporating eddy current braking - Google Patents
Transmissions incorporating eddy current brakingInfo
- Publication number
- NZ770589A NZ770589A NZ770589A NZ77058914A NZ770589A NZ 770589 A NZ770589 A NZ 770589A NZ 770589 A NZ770589 A NZ 770589A NZ 77058914 A NZ77058914 A NZ 77058914A NZ 770589 A NZ770589 A NZ 770589A
- Authority
- NZ
- New Zealand
- Prior art keywords
- eddy current
- carriage
- driving member
- movement
- elements
- Prior art date
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 85
- 230000007246 mechanism Effects 0.000 claims abstract description 65
- 230000033001 locomotion Effects 0.000 claims abstract description 57
- 239000004020 conductor Substances 0.000 claims abstract description 19
- 230000001939 inductive effect Effects 0.000 claims abstract description 15
- 230000000979 retarding effect Effects 0.000 claims abstract description 9
- 230000003993 interaction Effects 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000011800 void material Substances 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 7
- 238000013519 translation Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000001965 increasing effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 14
- 230000008901 benefit Effects 0.000 description 5
- 230000000977 initiatory effect Effects 0.000 description 3
- 239000006096 absorbing agent Substances 0.000 description 2
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- 238000007792 addition Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Landscapes
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
A zipline trolley or carriage comprising a transmission mechanism is described with a modified means of braking movement of the zipline trolley or carriage using a transmission mechanism and associated eddy current brake. In one embodiment, the transmission mechanism comprises a driving member and a driven member, movement of the driven member urged via transmission of movement from the driving member. Drag force inducing elements that move at different relative rates comprising an electrical conductor and magnet, each inducing element integrally coupled with the driven member in a manner that allows the elements to interact on movement and generate eddy current drag forces. When a motive force occurs on the driving member, that in turn applies a motive force on the driven member(s) and an eddy current drag force is then induced on the driven member(s) via interaction between the electrical conductor and the magnet that are integrally coupled to the driven member, the drag force then retarding movement of the driving member via the transmission and in turn retarding movement of the zipline trolley or carriage.
Description
TRANSMISSIONS INCORPORATING EDDY CURRENT BRAKING
TECHNICAL FIELD
Described herein is a transmission mechanism and method of use orating eddy current drag
ts and in doing so controlling or tailoring movement between members.
OUND ART
The applicant’s co-pending and granted s in the field of eddy current related devices include US
8,851,235, US 8,490,751, NZ619034, NZ627617, NZ627619, NZ627633, NZ627630 and other equivalents
all incorporated herein by reference. The s described in these patents/applications may be useful,
for example due to their providing frictionless methods of controlling movement. However , other
s of altering eddy current interactions and transmitting eddy current ctions may also be
ed or at least provide the public with a choice.
Further aspects and advantages of the transmission isms and methods of use should become
apparent from the g description that is given by way of example only.
SUMMARY
Described herein is a transmission mechanism and method of use for braking relative movement
between members, movement and braking of the members being directed through one or more
ission elements. The transmission mechanism and method of use allows for enhanced
braking/retarding performance thereby providing a r performance to that observed where the
eddy current elements are directly coupled to an external motive source.
In a first aspect, there is provided a transmission mechanism comprising:
at least one driving member (motive source); and
at least one driven member, movement of the at least one driven member urged via
transmission of movement from the at least one driving member;
drag force inducing elements that move at different relative rates comprising at least one
electrical conductor and at least one magnet, each element coupled with the transmission mechanism in
a manner that allows the elements to interact on movement and generate eddy current drag forces, the
elements y acting to govern the rate of movement between the driving and driven members.
In a second aspect, there is provided a method of transferring an eddy current drag force between
members by the step of:
(a) selecting a transmission mechanism substantially as described herein;
(b) applying a motive force on the at least one g member that in turn applies a motive force
on the at least one driven member;
(c) by causing motion of the at least one driven member, inducing an eddy current drag force on
either the at least one driving member or at least one driven member thereby retarding
movement of the member or members directly or indirectly via the transmission.
Advantages of the above bed transmission mechanism and method of use includes the ability to
direct and transfer an eddy current drag force directly or indirectly. Transmission of the eddy current
induced force also allows the ability to multiply the brake effects thereby sing the efficiency of the
mechanism compared to a directly coupled eddy current brake mechanism.
BRIEF DESCRIPTION OF THE DRAWINGS
Further aspects of the transmission mechanisms and methods of use will become apparent from the
following description that is given by way of example only and with reference to the accompanying
gs in which:
Figure 1 illustrates an example of a bevel gear transmission;
Figure 2 illustrates an example of a bevel gear transmission mechanism orating an eddy
current drag element;
Figure 3 illustrates images of a spool and gear transmission embodiment;
Figure 4a illustrates perspective and elevation views of a worm drive and spool embodiment;
Figure 4b illustrates an elevation view of an image of a plunger arrangement also using a worm
drive with the r elements engaged; and
Figure 4c illustrates an elevation view of an image of a plunger ement also using a worm
drive with the plunger elements dis-engaged.
ED DESCRIPTION
As noted above, described herein are transmission mechanisms and s of use for braking relative
movement between members, movement and braking of the members being directed through one or
more transmission elements. The transmission mechanism and method of use allows for enhanced
g/retarding performance thereby providing a r performance to that observed where the
eddy current elements are directly d to an external motive source.
For the purposes of this specification, the term ‘about’ or ‘approximately’ and grammatical variations
thereof mean a quantity, level, degree, value, number, frequency, percentage, dimension, size, amount,
weight or length that varies by as much as 30, 25, 20, 15, 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1% to a reference
quantity, level, degree, value, number, frequency, percentage, dimension, size, amount, weight or
length.
The term ‘substantially’ or grammatical variations thereof refers to at least about 50%, for example 75%,
85%, 95% or 98%.
The term 'comprise' and grammatical ions thereof 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.
In a first aspect, there is provided a transmission mechanism comprising:
at least one driving member (motive source); and
at least one driven member, movement of the at least one driven member urged via
transmission of movement from the at least one driving member;
eddy current drag force inducing elements that move at different relative rates comprising at
least one electrical conductor and at least one , each element coupled with the transmission
mechanism in a manner that allows the elements to interact on movement and te eddy current
drag forces, the elements thereby acting to govern the rate of movement between the driving and
driven members.
The transmission may translate movement of the driving member to movement of the at least one
second driven member. For e, transmitting on of the driving member shaft to rotation of
the driven member shaft. Transmission may be via a gear box coupling, , a cog or cogs. Transmission
may be via a coupling that does not utilise fasteners so that the driving and/or driven member(s) may be
releasably linked together.
As noted above, eddy current drag force inducing elements may be orated into the mechanism.
Eddy current drag is induced when an electrically conductive element moves in a magnetic field (or vice
versa), the eddy current drag forces induced then slow relative movement between the tive
element and the magnetic field.
The at least one conductor may be directly coupled to the at least one driving member (motive source)
and the at least one magnet is indirectly coupled to the at least one driving member e source) via
the transmission mechanism, and wherein:
(a) the ission mechanism moves both elements rotationally;
(b) the reaction torque (eddy current drag force effects) induced by the elements is transferred into
the driving member of the transmission mechanism.
Alternatively, the at least one magnet may be ly coupled to the at least one driving member
(motive source) and the at least one tor is indirectly d to the at least one driving member
(motive source) via the transmission ism, and wherein:
(a) the transmission mechanism moves both ts rotationally;
(b) the reaction torque (eddy current drag force effects) induced by the elements is transferred into
the driving member of the transmission mechanism.
The at least one electrical conductor and the at least one magnet may be independent to each other and
indirectly coupled to the at least one driving member by the transmission ism. One type of
ission mechanism employing this arrangement may be a bevel drive. As may also be appreciated,
this arrangement also allows the possibility of having varying transmission ratios for both the at least one
conductor and at least one magnet.
The at least one driving member may be a shaft or coupling that rotates. A rotational driving torque may
be imposed by a force. For example, the force may be ted by an object linked to the driving
member, non-limiting es including a wheel or an object linked to a spool via a line, the spool
rotating when the object causes the line to pay out from the spool as may be the case for autobelay or
fall safety apparatus. These devices are described in more detail below.
The at least one second driven member may be a shaft or coupling that also rotates.
In the above embodiment, onal movement of the at least one driving member urges at least two
driven members to rotate in opposite directions.. In one embodiment, the g member and at least
one driven member in a rotational embodiment may be angled relative to each other, movement being
transmitted via the transmission in a different (opposite) direction. The angle of translation may range
from at least 1, or 5, or 10, or 15, or 20, or 25, or 30, or 35, or 40, or 45, or 50, or 55, or 60, or 65, or 70,
or 75, or 80, or 85, or 90 degrees. In such embodiments, a bevel gearbox may be used to drive the
change in angle. Whilst not essential, this arrangement of the driven members working together via an
eddy t interaction may provide a particularly strong brake action in the embodiment described
above – counter rotation occurs between the driven members effectively amplifying (inducing double)
the eddy t drag force owing to the opposing relative movement between the magnetic field and
conductor.
Rotational nt alone as noted above should not be seen as limiting as, for example, the driven
member or members may instead undergo a linear and/or axial translation as well, an example of which
is described r below.
The transmission mechanism may move both members rotationally about a fixed axis. In one
embodiment, the fixed axis may be a common axis between the ts although offset axes may also
be used.
The ratio of movement between the driving and driven members may be pre-determined or pre-set.
This may be achieved for example via a tooth and cog gear arrangement. In one embodiment, the ratio
of movement between the driving and driven members may range from imately 1:0.001 to
1:1000. The ratio of driving and driven members may be approximately 1, or 1:0.005, or 1:0.01, or
, or 1:0.1, or 1:0.5, or 1:1 or 1:5, or 1:10, or 1:50 or 1:100, or 1:500, or 1:1000 although other ratios
may be useful depending on the end application for the mechanism. In one embodiment, the ratio of
movement between the driving and driven members may be approximately 1:1 although other ratios
may be useful depending on the end application for the mechanism.
In one example, the transmission mechanism may be ed so that:
(a) the at least one conductor rotates at a rotational velocity governed by the ission ratio
and the driving member (motive source) velocity; and
(b) the at least one magnet rotates at a rotational velocity ed by the ission ratio and
the driving member velocity in a rotational direction opposite the ion of rotation of the
conductor.
The rate of nt of the driving and driven members may vary once eddy current drag forces are
induced and continue to vary until a critical velocity is reached, the critical velocity being where the eddy
current drag force does not increase with increased rotational velocity acting on the at least one driving
member.
On initiation of eddy current drag force generation, up to a critical velocity applied to the at least one
g member, the braking torque between the eddy current elements increases by twice the
transmission ratio.
On initiation of eddy current drag force tion, up to a critical ty applied to the at least one
driving member, the braking torque between the eddy current ts may act on both the at least
one driven and at least one driving members via the transmission.
Alternatively, on initiation of eddy current drag force generation, up to a critical velocity d to the at
least one driving member, the braking torque between the eddy current elements may act on the at
least one driving member via the transmission and at least one driven member. In this embodiment, the
eddy current elements may not be directly coupled to the at least one driving member. This
embodiment may be used where further multiplication in torque achieved over an eddy current brake
effect may be desired with the at least one driving member coupled to only one eddy current element
(at least one conductor or at least one magnet).
Above the critical velocity, the reaction torque may remain multiplied relative to a directly d
system and the reaction torque remains approximately constant with variation in speed above the
critical velocity.
As may be appreciated from the above, the mechanism described allows erably increased drag
force effects than a directly coupled eddy current drag mechanism. In other words, up to the critical
velocity and torque of the eddy current drag force effects, the mechanism described herein may:
• Approximately double the braking torque in rotational speeds up to the critical velocity of the
eddy t drag force action on the on the transmission members;
• Causes the imately doubled torque on the eddy current elements to act on the driving
member (motive source) in two locations, thereby doubling the torque further;
• It can be seen that this provides approximately four times the reaction torque to the motive
force over that of the same eddy current elements directly coupled to the driving member
(motive force). Further, the critical velocity apparent at the motive input is half of that of a
directly d system.
As noted above, the critical velocity is a point where the eddy current drag force does not increase with
increased rotational velocity and the reaction torque remains multiplied over a ly coupled system
and approximately constant and/or controlled. That is, above the al velocity, an extra force input
into the driving member leads to the same eddy current drag force output.
The ission mechanism may be a worm drive. The term ‘worm drive’ refers to a gear arrangement
where a worm (gear in the form of a screw) meshes with a mating gear. Other types of drive with a
similar mechanism are also encompassed with this term including helical gears with angularly offset axes
and/or helical spur gears with axes of rotation angularly rotated to each other. In this embodiment, the
transmission may operate in the mode of ing a step up in velocity from the rotational velocity of
the driving member to the rotational velocity of the eddy current inducing element or elements thereby
providing a resisting force to the rotational velocity of the driving member.
The transmission ratio and/or coefficient of friction at the gear interface may be selected such that the
transmission operates with a prescribed level of mechanical efficiency. The prescribed level of
mechanical ency may be sufficiently low to provide a supplementary retarding torque over that
provided by the induced eddy current drag force and the numerical gear ratio alone. In practice it is
envisaged that the mechanism may have a low mechanical efficiency – that is, there would be significant
mechanical losses in the transmission. The prescribed level of mechanical efficiency (if low) results in an
increase on the reaction torque on the motive force in excess of that conferred by the eddy current drag
force and the numerical gear ratio alone. A benefit of this is that the ical losses in the worm
system can be used as a mentary retarding torque, tional to the eddy current drag force, as
governed by the laws of friction, thereby decreasing the torque demand ed of the eddy current
drag force over an eddy current brake system coupled with a very high efficiency transmission system.
In the above worm drive embodiment, a friction torque may be held imately in proportion to the
eddy current element induced braking torque. As may be appreciated, this arrangement may act to
amplify the eddy current induced braking torque.
The transmission mechanism may be ured to comprise a worm drive using an axially fixed eddy
current element retaining worm. As may be appreciated this is a very simple arrangement yet this
achieves the d objective of transmitted driving and driven elements with eddy current induced
braking effects on movement.
The transmission mechanism may be configured to comprise:
a tube including a wall and void defined therein;
a cylinder that fits into the tube void, the cylinder being a driven member linked to a driving
member ing an input torque, the cylinder moving in response to an input torque on the driving
member relative to the tube via axial ation of the cylinder relative to the tube so that the er
can pass at least partially into or out of the tube void; and rotation of the cylinder relative to the tube
about a longitudinal axis, the axis passing through the tube void;
n, coupled to the tube and cylinder are one or more eddy current inducing elements and,
in use, the er and tube have different relative speeds of rotation to each other such that, when the
tube and/or cylinder is or are moved via axial translation caused by the driven member so that the
cylinder at least lly enters the tube void, a braking reaction force on rotation of the driven member
occurs due to induced eddy current drag force generation thereby slowing the velocity of rotation of the
driving member.
In the above configuration, the degree of overlap between the tube and cylinder may determine the
degree of eddy current induced drag force.
The axial force applied to the cylinder may be imposed by the driven member, the degree of axial force
applied being proportional to the torque acting on the driving member. Imposing may be via a reaction
force acting on the driven member causing driven member movement e.g. extension of the worm along
the line of a shaft that is the driven member causing driven member rotation. This example should not
be seen as limiting as it should be appreciate that the imposed axial force may be applied in many
different ways to suit the end application.
The transmission used in the above tube and er embodiment may be a worm drive, the term
‘worm drive’ defined in a similar manner to that noted above except in this case the worm drive is
incorporated into the tube and cylinder arrangement.
The eddy current elements may be selectively d to the driven member (or worm element if used),
whereby the axial force applied to the driven member may be used to engage and age a coupling
connecting the driven member to the eddy current elements. ment occurs in response to a force
threshold having been achieved. Disengagement occurs in response to a force threshold having been
achieved. An engaging effect may be useful to allow movement under a range of ‘normal’ scenarios for a
device in which the mechanism is used, but, on application of a predetermined force, engagement and
braking then occurs (and disengagement as well once the predetermined force is reached post
ment). Movement of the eddy current elements (magnets and conductor(s)) er or apart to
engage or disengage may be urged via a mechanism such as a bias mechanism.
In a second aspect, there is provided a method of transferring an eddy current drag force between
members by the step of:
(a) selecting a transmission mechanism substantially as described herein;
(b) applying a motive force on the at least one driving member that in turn applies a motive force
on the at least one driven member;
(c) by causing motion of the at least one driven member, ng an eddy current drag force on
either the at least one driving member or at least one driven member thereby retarding
movement of the member or members directly or indirectly via the ission.
Final embodiments for the transmission mechanism described herein may be varied. For e, an
autobelay or self retracting lifeline (SRL) embodiment may use the transmission mechanism and method
of use described. In an SRL embodiment, a line may extend and retract from the SRL device and when
the line extends from the SRL device at a rate beyond a predefined threshold, the transmission
mechanism engages and applies a ing force on the rate of line extension. SRL and autobelay
applications should not be seen as limiting since the transmission mechanisms described may be used
for a wide variety of other applications, non-limiting examples including speed control or load control of:
• A rotor in a rotary turbine;
• Exercise equipment e.g. rowing es, epicyclic trainers, weight training equipment;
• Roller-coasters and other amusement rides;
• Elevator and escalator systems;
• Evacuation descenders and fire escape devices;
• Conveyer systems:
• Rotary drives in factory production facilities;
• Materials ng devices such as conveyer belts or a g device in a chute;
• Roadside safety systems e.g. the energy absorber may be connected in a system to provide
crash attenuation though the dissipation of energy via the energy absorber;
• Seat belts in vehicles;
• Zip lines;
• Braking mechanisms for trolleys and carriages;
• Bumpstops in transport applications;
• Bumpstops in crane applications;
• Torque or force limiting devices in mechanical drive train;
• ural overload protection in wind es;
• Load ng and energy dissipation in structures, ngs and bridges.
Advantages of the above described transmission mechanism and method of use includes the ability to
direct and transfer an eddy current drag force directly or indirectly. Transmission of the eddy current
induced force also allows the ability to ly the brake effects thereby increasing the efficiency of the
mechanism ed to a directly coupled eddy current brake mechanism.
The embodiments described above may also be said y to consist in the parts, elements and
features referred to or indicated in the specification of the application, individually or collectively, and
any or all combinations of any two or more said parts, elements or features.
r, where specific integers are mentioned herein which have known equivalents in the art to which
the ments relate, such known lents are deemed to be incorporated herein as of
individually set forth.
WORKING EXAMPLES
The above described transmission mechanism and method of use is now described by reference to
specific es.
EXAMPLE1
Figure 1 illustrates a bevel gear transmission 1. The driving member 2 drives nt of the driven
members 3,4 via a cog ement 5. Rotation movement of the driving member 2 drives r
rotating movement shown by the arrows A and B of the driven members 3,4. Gearing may be used on
the cogs to increase or decrease relative counter rotation of the driven members.
Figure 2 illustrates how an eddy current drag inducing t may be integrated into the bevel gear
transmission 1 shown in Figure 1. Figure 2 shows a driving member 2 that rotates to impart rotation
movement on the driven members 3,4. Movement is transmitted via the transmission about a 90 degree
bend 5. By virtue of this force transmission the driven members 3,4 oppose each other and they counter
rotate relative to each other. An eddy current drag element may be integrated into the transmission
mechanism by use of magnets 6 located about the axis of a first driven member 3 and a shaft 7
extending from the axis of the second driven member 4 that acts as a conductor 7 which interacts with
the magnetic field created by the magnets 6 on the first driven member 3. Since the driven members 3,4
are positioned opposite each other a common axis of rotation can integrate the eddy current drag
element. As noted above, the bevel gear transmission 5 imparts counter rotational movement of the
driven members 3,4 . This has the advantage of effectively doubling the eddy t induced forces
since the relative motion between the driven members 3,4 is potentially equal and opposite rotation. It
should be appreciated that the magnets 6 and tor 7 may be reversed with the magnets 6 being
located on the second driven member shaft 4 and the conductor 7 being located about the first driven
member 3.
EXAMPLE 2
Figure 3 illustrates a potential product ment where the driving member is d to a spool 10
of line 11, the line 11 attached to an object such as a person (not shown). In the event of line 11 being
drawn from the spool 10, spool 10 rotation occurs that in turn causes rotation of the driven members
12,13. The driven s 12,13 orate an eddy current drag element 14 and when on
occurs, a drag force is imparted on the spool 10 via the transmission mechanism 15. In Figure 3, the
eddy current drag element comprises an axial shaft 16 extending from the first driven member 12 and a
conductive member 17 on the shaft 16 that may move rotationally with the shaft 16 and axially based on
an urging force (not . T he second driven member 13 es a hollow cylindrical extension 18
located with a common axis of rotation X with the second driven member 13 (and first driven member
12). The inside of the hollow cylinder 18 may be lined with magnets 19 to create a magnetic field inside
the hollow cylinder 18. Driving member 10 movement causes counter rotational driven members 12,13
movement via the transmission 15. Axial movement of the tive member 17 on the first driven
member 12 may occur moving the conductive member 17 into the hollow er 18 thereby inducing
eddy current drag interactions. This in turn brakes relative nt between the driven members
12,13 which, via the transmission 15, brakes movement of the g member 10.
EXAMPLE 3
Figure 4a illustrates an alternative embodiment using a worm drive 30 as a driven member and a spool
31 with line 32 acting as the driving member. The worm drive 30 acts as a transmission mechanism
transmitting rotational movement of the spool 31 into rotational and axial movement of the worm drive
. The worm drive 30 may include an eddy current drag element 35.
In Figure 4b, the eddy current drag element comprises a hollow cylinder 33 with a magnetic field
generated by magnets 33A and a conductive member (a plunger) 34 that moves rotationally and,
optionally axially, into and out of the magnetic field. When the plunger 34 is in the magnetic field, eddy
current drag forces are induced thereby slowing rotation and/or axial translation of the worm drive 30.
This in turn slows movement of the spool 31 or driving member. The r 34 may move axially in
response to the axial thrust provided by the worm drive 30. Figure 4c illustrates how the plunger 34 and
cylinder 33 may separate via axial translation along a common axis of rotation. Once ted, the
parts may not incur and eddy current braking effects but can engage once a predetermined force
old is reached
Aspects of the transmission mechanism and method of use have been described by way of example only
and it should be appreciated that modifications and additions may be made thereto without departing
from the scope of the claims herein.
Claims (18)
1. A zipline trolley or carriage comprising a ission mechanism, the transmission mechanism comprising: at least one driving member ; and at least one driven member, movement of the at least one driven member urged via transmission of movement from the at least one driving member; drag force inducing elements that move at different relative rates comprising at least one electrical conductor and at least one magnet, each inducing t integrally coupled with at least one driven member in a manner that allows the elements to interact on movement and generate eddy t drag forces, and when a motive force occurs on the at least one driving member, that in turn applies a motive force on the driven members, an eddy current drag force is then induced on the driven members via interaction n the at least one electrical conductor and the at least one magnet that are integrally coupled to the at least one driven member, the drag force then ing movement of the at least one driving member via the transmission and in turn retarding movement of the zipline trolley or carriage.
2. The zipline y or carriage as d in claim 1 n the at least one conductor is directly coupled to the at least one driving member (motive source) and the at least one magnet is indirectly coupled to the at least one driving member (motive source) via the transmission mechanism, and wherein: (a) the transmission mechanism moves both elements rotationally; (b) the reaction torque (eddy current drag force effects) induced by the elements is transferred into the driving member of the ission mechanism.
3. The zipline y or carriage as claimed in claim 1 wherein the at least one magnet is directly coupled to the at least one driving member (motive source) and the at least one conductor is indirectly coupled to the at least one driving member (motive source) via the transmission mechanism, and n: (a) the transmission mechanism moves both elements onally; (b) the on torque (eddy current drag force effects) induced by the elements is transferred into the driving member of the transmission mechanism.
4. The zipline trolley or carriage as claimed in claim 1 wherein the at least one electrical conductor and the at least one magnet are independent to each other and coupled to the driven members.
5. The e trolley or carriage as claimed in claim 1 wherein rotational movement of the at least one driving member urges at least two driven members to rotate in opposite directions.
6. The e trolley or carriage as claimed in claim 1 wherein the transmission mechanism moves both members rotationally about a fixed axis.
7. The zipline trolley or carriage as claimed in claim 6 wherein the fixed axis is a common axis between the elements.
8. The zipline trolley or carriage as claimed in claim 1 wherein the rate of movement of the driving and driven members vary once eddy current drag forces are induced and continue to vary until a al velocity is reached, the critical velocity being where the eddy current drag force does not increase with increased rotational velocity acting on the at least one driving member.
9. The zipline trolley or carriage as d in claim 1 wherein the transmission mechanism is a worm drive.
10. The zipline trolley or ge as claimed in claim 9 wherein the transmission es in the mode of providing a step up in velocity from the rotational ty of the g member to the rotational velocity of the eddy current inducing element or elements thereby providing a ing force to the rotational velocity of the driving member.
11. The zipline y or carriage as claimed in claim 1 wherein a friction torque is held approximately in proportion to the eddy current element induced braking torque.
12. The zipline trolley or carriage as claimed in claim 1 wherein the transmission mechanism is configured to comprise: a tube including a wall and void defined therein; a er that fits into the tube void, the cylinder being a driven member linked to a driving member providing an input torque, the cylinder moving in response to an input torque on the g member relative to the tube via axial translation of the cylinder relative to the tube so that the cylinder can pass at least partially into or out of the tube void; and rotation of the cylinder relative to the tube about a longitudinal axis, the axis g through the tube void; wherein, coupled to the tube and cylinder are one or more eddy current inducing elements and/or one or more magnetic attraction effects; and, in use, the cylinder and tube have ent relative speeds of rotation to each other such that, when the tube and/or cylinder is or are moved via axial translation caused by the driven member so that the cylinder at least partially enters the tube void, a braking reaction force on rotation of the driven member occurs due to induced eddy current drag force generation thereby slowing the velocity of rotation of the driving .
13. The zipline trolley or carriage as claimed in claim 12 wherein the degree of overlap between the tube and cylinder ines the degree of eddy current induced drag force and/or magnetic attraction
14. The zipline trolley or carriage as claimed in claim 12 n the axial force applied to the cylinder is imposed by the driven member, the degree of axial force applied being proportional to the torque acting on the driving member.
15. The zipline trolley or carriage as claimed in claim 12 n the transmission is a worm drive.
16. The zipline trolley or carriage as d in claim 15 wherein the eddy current elements are selectively coupled to the worm element, y the axial force applied to the worm gear is used to engage and disengage a coupling connecting the worm drive to the eddy current elements.
17. The zipline trolley or carriage as d in claim 16 wherein engagement occurs in response to a force threshold having been achieved.
18. The zipline trolley or carriage as claimed in claim 16 wherein disengagement occurs in response to a force threshold having been achieved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ770589A NZ770589A (en) | 2014-12-04 | 2014-12-04 | Transmissions incorporating eddy current braking |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ770589A NZ770589A (en) | 2014-12-04 | 2014-12-04 | Transmissions incorporating eddy current braking |
NZ713671A NZ713671A (en) | 2014-12-04 | 2014-12-04 | Transmissions incorporating eddy current braking |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ770589A true NZ770589A (en) | 2022-07-01 |
Family
ID=82257964
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NZ770589A NZ770589A (en) | 2014-12-04 | 2014-12-04 | Transmissions incorporating eddy current braking |
NZ713671A NZ713671A (en) | 2014-12-04 | 2014-12-04 | Transmissions incorporating eddy current braking |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NZ713671A NZ713671A (en) | 2014-12-04 | 2014-12-04 | Transmissions incorporating eddy current braking |
Country Status (1)
Country | Link |
---|---|
NZ (2) | NZ770589A (en) |
-
2014
- 2014-12-04 NZ NZ770589A patent/NZ770589A/en unknown
- 2014-12-04 NZ NZ713671A patent/NZ713671A/en unknown
Also Published As
Publication number | Publication date |
---|---|
NZ713671A (en) | 2022-07-01 |
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Legal Events
Date | Code | Title | Description |
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PSEA | Patent sealed | ||
RENW | Renewal (renewal fees accepted) |
Free format text: PATENT RENEWED FOR 1 YEAR UNTIL 04 DEC 2024 BY HOLMES SOLUTIONS LIMITED PARTNERSHIP Effective date: 20230908 |