NZ753662B2 - Method and apparatus for testing rolling resistance - Google Patents
Method and apparatus for testing rolling resistance Download PDFInfo
- Publication number
- NZ753662B2 NZ753662B2 NZ753662A NZ75366217A NZ753662B2 NZ 753662 B2 NZ753662 B2 NZ 753662B2 NZ 753662 A NZ753662 A NZ 753662A NZ 75366217 A NZ75366217 A NZ 75366217A NZ 753662 B2 NZ753662 B2 NZ 753662B2
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- New Zealand
- Prior art keywords
- mattress
- cylindrical weight
- weight
- cylindrical
- moving
- Prior art date
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- 238000005096 rolling process Methods 0.000 title claims abstract description 26
- 230000003068 static Effects 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 7
- 239000003550 marker Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000000284 resting Effects 0.000 description 1
- 239000002965 rope Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/001—Testing of furniture, e.g. seats or mattresses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
Abstract
method and apparatus for testing rolling resistance of a mattress by rolling a cylindrical weight across at least a portion of the mattress and measuring torque of the cylindrical weight moving across the mattress. The apparatus is preferably automated and preferably continuously measures torque as the cylinder is continuously moved across the mattress at a constant speed. The invention provides an alternative for roll-together testing methods to quantify and compare results in a repeatable, scientific manner. s the cylinder is continuously moved across the mattress at a constant speed. The invention provides an alternative for roll-together testing methods to quantify and compare results in a repeatable, scientific manner.
Description
METHOD AND APPARATUS FOR TESTING ROLLING RESISTANCE
FIELD OF THE INVENTION
The invention relates to a method of testing rolling resistance of a
mattress. In particular, the invention relates, but is not limited, to a method of
testing and quantifying rolling resistance of a mattress by measuring the torque
required to roll a weight across the mattress.
BACKGROUND TO THE INVENTION
Reference to background art herein is not to be construed as an
admission that such art constitutes common general knowledge.
Mattresses are often used on bed bases, or the like, for resting and
sleeping. It is fairly common for couples to sleep together on the same
mattress. In such cases deflection of the mattress can cause a phenomenon
known as ‘roll together’ whereby the weight of the users causes a depression
which encourages the two users to roll together towards each other. It is
generally considered as undesirable and many attempts have been made to try
to overcome and prevent this phenomenon.
One characteristic which is generally considered to be desirable in
preventing roll together is a resistance to rolling. In essence, this is the
resistance that mattress provides to a body, such as a person, rolling on the
mattress. It is, however, very difficult to objectively quantify and compare the
rolling resistance of mattresses, particularly at the time of purchase where is it
not possible to sleep on the mattress with a partner for any great length of time.
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OBJECT OF THE INVENTION
It is an aim of this invention to provide a method of testing rolling
resistance, or an apparatus for testing rolling resistance, of a mattress which
overcomes or ameliorates one or more of the disadvantages or problems
described above, or which at least provides a useful commercial alternative.
Other preferred objects of the present invention will become
apparent from the following description.
SUMMARY OF INVENTION
In one form, although it need not be the only or indeed the broadest
form, there is provided a method of testing rolling resistance of a mattress, the
method comprising the steps of:
positioning a cylindrical weight on the mattress;
moving the cylindrical weight across at least a portion of the
mattress; and
measuring torque of the cylindrical weight moving across the
mattress.
Preferably the step of moving the cylindrical weight across at least a
portion of the mattress comprises rolling the cylindrical weight across at least a
portion of the mattress. Preferably the cylindrical weight is rolled at least one
full revolution, even more preferably more than 1 revolution.
Preferably the step of measuring torque of the cylindrical weight
comprises measuring torque created by the cylindrical weight moving across
the mattress. Alternatively, preferably the step of measuring torque of the
cylindrical weight comprises measuring torque required to roll the cylindrical
weight across the mattress.
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Preferably the step of moving the cylindrical weight across at least a
portion of the mattress comprises moving the cylindrical weigh using at least
one actuator. Preferably the actuator is a linear actuator. Preferably the linear
actuator is a hydraulic or pneumatic actuator. Alternatively the actuator may be
powered electrically. The actuator may be a rotatory actuator. Preferably the
actuator pushes the cylindrical weight across the mattress. Alternatively the
actuator may pull the cylindrical weight across the mattress. Preferably the
actuator is operatively connected to an axle of the cylindrical weight. Preferably
the cylindrical weight and actuator are operatively connected such that mass
distribution of the cylindrical weight remains constant as the actuator moves the
cylindrical weight across at least a portion of the mattress.
Optionally the method further comprises the step of positioning a first
weight, preferably a static weight, on the mattress. Preferably the first weight is
a first cylinder and preferably the cylindrical weight is a second cylinder.
Preferably the method comprises arranging the weighted cylinders with parallel
rotational axes. Preferably the cylinders are of similar size and weight.
Preferably the second cylinder positioned spaced apart from the first cylinder.
Preferably the step of moving the cylindrical weight across at least a portion of
the mattress comprises moving the second cylinder towards the first cylinder.
Preferably the method comprises determining any change in angle of
the first weight in response to the cylindrical weight being moved across the
mattress. Preferably the step of determining any change in angle of the first
weight in response to the second weight being moved comprises taking a
measurement using an inclinometer. Preferably the inclinometer comprises a
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digital protractor. Preferably the method comprises the step of zeroing the
digital protractor before taking any measurements.
Preferably the step of measuring torque created by the cylindrical
weight comprises measuring the output of a force gauge. Preferably the force
gauge is located at an axle of the second cylinder. Preferably the force gauge
is located between the actuator and the cylindrical weight. Preferably the force
gauge is a torque gauge.
Preferably the cylindrical weight is moved continuously. Preferably
the step of measuring torque created by the cylindrical weight moving across
the mattress comprises continuously, or at least substantially continuously,
measuring the torque as the cylindrical weight is moved continuously across the
mattress. Preferably the step of moving the cylindrical weight across at least a
portion of the mattress comprises moving the cylindrical weight continuously at
a constant speed.
Preferably the mass of at least one of the cylindrical weight and the
static weight is variable. Preferably the method comprises the step of varying
the mass of the weights until each weight has a predetermined mass.
Preferably the method further comprises the step of marking one or
more reference lines on the mattress. Preferably a plurality of reference lines
are marked on the mattress. Preferably the step of positioning a cylindrical
weight on the mattress comprises positioning the cylindrical weight on a
reference line on the mattress.
Preferably the step of marking one or more reference lines on the
mattress comprises determining a centre line of the mattress and measuring
marking at least one reference line a predetermined distance from the centre
3402534v1
line. Preferably the step of marking one or more reference lines on the
mattress comprises measuring a predetermined distance from one or more
edges of the mattress and marking a reference line parallel to an edge of the
mattress. Preferably the step of marking one or more reference lines on the
mattress comprises marking a reference grid on the mattress.
The method may comprise automatically determining a position
location of the cylindrical weight on the mattress. The method may comprise
measuring cylindrical weight as it is located on the mattress. The step of
moving the cylindrical weight across at least a portion of the mattress preferably
comprises measuring displacement of the second weight as it is moved.
Preferably the step of measuring displacement of the second weight as it is
moved is performed automatically. The displacement of the second weight may
be measured by measuring revolutions, including any partial revolution, of the
second weight as it is rolled across the mattress.
In one form the cylindrical weight is pushed along the mattress by a
drive system. In another form the cylindrical weight is pulled along the mattress
by a drive system. In the latter form, the cylindrical weight is preferably
operatively connected to a pair of line members that extend from the drive
system. Preferably an actuator retracts the line members which in turn pulls the
weighted cylinder across the mattress.
In another form, there is provided an apparatus for testing rolling
resistance of a mattress, preferably carrying out the method as hereinbefore
described, the apparatus comprising:
a cylindrical weight;
3402534v1
at least one actuator operatively coupled to the cylindrical weight, the
actuator being configured to move the cylindrical weight across at least a
portion of the mattress; and
a force gauge configured to measure torque of the cylindrical weight
moving across the mattress.
Preferably the force gauge comprises a torque gauge. Preferably
the apparatus further comprises a drive system configured to move the
cylindrical weight across the mattress. Preferably the drive system comprises
one or more actuators. Preferably the actuators are linear actuators operatively
connected to an axle of the cylindrical weight. Preferably the force gauge is
configured to measure torque created by the cylindrical weight moving across
the mattress. In another form the one or more actuators are preferably rotary
actuators configured to drive the cylinder across the mattress. In this form the
force gauge is preferably configured to measure torque required to roll the
cylindrical weight across the mattress.
The drive system may be configured to push and/or pull the
cylindrical weight across the mattress. The drive system may comprise a pair of
line members that extend from the drive system to the cylindrical weight. The
drive system may comprise an actuator configured to retract the line members
which, in turn, pulls the weighted cylinder across the mattress.
Preferably the apparatus comprises a static weight. Preferably the
static weight comprises an inclinometer to measure changes in angle of the
static weight as the cylindrical weight is moved across the mattress. Preferably
the inclinometer comprises a digital protractor. Preferably the mass of the
weighted cylinders is variable. Preferably the apparatus is automated to
3402534v1
continuously move the cylindrical weight across the mattress and to
continuously, or at least substantially continuously, measure the torque created
by the cylindrical weight moving across the mattress.
Further features and advantages of the present invention will
become apparent from the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
By way of example only, preferred embodiments of the invention will
be described more fully hereinafter with reference to the accompanying figures,
wherein:
Figure 1 illustrates a diagrammatic view of an apparatus testing
rolling resistance of a mattress in a first position;
Figure 2 illustrates a diagrammatic view of the apparatus testing
rolling resistance of a mattress of figure 1 in a second position;
Figure 3 illustrates a line graph showing continuous angle and torque
measurements; and
Figure 4 illustrates a perspective view of another apparatus testing
rolling resistance of a mattress.
DETAILED DESCRIPTION OF THE DRAWINGS
Figures 1 and 2 illustrate a mattress 10 having markings 12. A static
weight in the form of a first weighted cylinder 20 and a cylindrical weight in the
form of a second weighted cylinder 40 are positioned on top of the mattress 10
on the markings 12. A drive system 50 having actuators 52 in the form of
hydraulic, pneumatic, or electric actuators operatively connected to an axle 42
of the second weighted cylinder 40. In another form (not shown) the actuators
may be rotary actuators that drive the second weighted cylinder 40 across the
3402534v1
mattress 10.
A force gauge 54 configured to measure torque created by the
second weighted cylinder 40 moving across the mattress is also provided. The
force gauge determines the torque, preferably in newton metres (Nm), created
by the rolling resistance of the mattress on imparted to the second weighted
cylinder 40 as it is moved across the mattress by the drive system 50. In the
rotary actuator form, the force gauge is preferably a torque gauge that
measures the torque required to roll the second weighted cylinder 40 across the
mattress 10.
The first cylinder 20 has an inclinometer 22, preferably in the form of
a digital protractor, mounted to an end thereof. The inclinometer 22 may be
mounted to a bracket (only shown in figure 4) located on the end of the first
cylinder 20. The inclinometer 22 is configured to measure an angle of the first
cylinder 20. Although it is illustrated as being horizontal in figure 1, it is not
strictly necessary for the inclinometer 22 to start in the horizontal position,
rather it may be zeroed or have an initial reading which can be subtracted from
subsequent readings to yield a relative angle measurement from an initial
position to a further position.
The weighted cylinders 20, 40 preferably each weigh between 40
and 120kgs, more preferably between 50 and 100kgs, even more preferably
between 60 and 80kgs, and in a preferred form weigh around 70kgs.
Figure 4 illustrates an alternative arrangement whereby the second
weighted cylinder 40 is configured to be pulled towards the first weighted
cylinder 20 instead of pushed. In the arrangement in figure 4 the second
weighted cylinder 40 is operatively connected to a pair of line members 56,
3402534v1
typically made of wire or rope, which extend from the drive system 50. The
drive system has a frame that abuts the mattress 10 and an actuator retracts
the line members 56 which in turn pulls the second weighted cylinder 40 in the
direction indicated by arrow 2 towards the first cylinder 20.
Figure 3 illustrates a line graph showing torque 5 of the second
cylinder 40 and angle 7 of the first cylinder 20 as the second cylinder 40 is
moved continuously over 500mm (for example purposes) of the mattress 10.
Example steps undertaken to obtain the measurements illustrated in figure 3
are as follows.
Firstly, the mattress 10 is placed on a level supported surface.
Markings 12 are then applied to the mattress 10. The markings 12 are
preferably determined from a centreline of the mattress 10 and are spaced a
predetermined distance from the centreline and the edges of the mattress 10.
Preferably the markings form a grid, preferably with two longitudinal markings
being spaced approximately 405mm from the centreline and with two
longitudinally perpendicular lines being spaced approximately 400mm from the
short ends of the mattress 12. The markings may be made by any suitable
form such as, for example, marker pen or chalk.
The first cylinder 20 and second cylinder 40 may then be placed on
the mattress 10. As the cylinders 20, 40 are weighted, they are typically very
heavy and the assistance of a crane, or the like, may be employed to assist with
locating the cylinders 20, 40 on the mattress 10. A removable anchor, such as
an eye bolt 24, 44 (as seen in figure 4), may be affixed to the cylinders 20, 40
for the purpose of being lifted by the crane.
3402534v1
Once the cylinders 20, 40 are located on the mattress 10, they may
be positioned on the markings 12. Specifically, the axles of each cylinder 20,
40 are preferably aligned with the markings 12. The drive system 50 is
preferably removably attached to the second cylinder 40 and, accordingly, the
actuators 52 of the drive system 50 are preferably connected to the axle 42 of
the second cylinder 40. Optionally, the drive actuators 52 of the drive system
50 may be permanently mounted to the second cylinder 40, in which case the
drive system 50 preferably includes means for lifting and locating the second
cylinder 40 onto the mattress 10.
Optionally, an inclinometer 22 may be mounted to the first cylinder
to measure angle to simultaneously assess roll together characteristics of
the mattress 10. If such roll together characteristics are not of interest, then the
first cylinder 20 may not be deemed necessary. However, it is preferred to
have a static weight, such as the first cylinder 20, for the second cylinder 40 to
approach as outlined.
Once the cylinders 20, 40 are positioned and the second cylinder 40
is operatively connected to the actuators 52 of the drive system 50, the
actuators are activated which drives the second cylinder 40 towards the first
cylinder 10, as indicated by arrow 2. As the second cylinder moves across the
mattress 10, the rolling resistance of the mattress 10 creates a torque in the
second cylinder 20 which is measured using the force gauge 54. The
movement and measurement are preferably performed simultaneously and
continuously.
3402534v1
Once the measurements have been taken, they can then be plotted.
as shown in figure 3, and rolling resistance characteristics of the mattress 10
can be quantified and compared with other mattresses.
Advantageously, the invention allows rolling resistance
characteristics of mattresses to be quantified and compared in a repeatable,
scientific manner. The method is relatively straight forward and accurately
measures rolling resistance and ‘roll together’ characteristics. Mattresses with
enhanced rolling resistance can therefore be readily identified and advertised
accordingly.
In this specification, adjectives such as first and second, left and
right, top and bottom, and the like may be used solely to distinguish one
element or action from another element or action without necessarily requiring
or implying any actual such relationship or order. Where the context permits,
reference to an integer or a component or step (or the like) is not to be
interpreted as being limited to only one of that integer, component, or step, but
rather could be one or more of that integer, component, or step etc.
The above description of various embodiments of the present
invention is provided for purposes of description to one of ordinary skill in the
related art. It is not intended to be exhaustive or to limit the invention to a single
disclosed embodiment. As mentioned above, numerous alternatives and
variations to the present invention will be apparent to those skilled in the art of
the above teaching. Accordingly, while some alternative embodiments have
been discussed specifically, other embodiments will be apparent or relatively
easily developed by those of ordinary skill in the art. The invention is intended
to embrace all alternatives, modifications, and variations of the present
3402534v1
invention that have been discussed herein, and other embodiments that fall
within the spirit and scope of the above described invention.
In this specification, the terms ‘comprises’, ‘comprising’, ‘includes’,
‘including’, or similar terms are intended to mean a non-exclusive inclusion,
such that a method, system or apparatus that comprises a list of elements does
not include those elements solely, but may well include other elements not
listed.
3402534v1
Claims (31)
1. A method of testing rolling resistance of a mattress, the method comprising the steps of: positioning a cylindrical weight on the mattress; moving the cylindrical weight across at least a portion of the mattress; measuring torque of the cylindrical weight moving across the mattress.
2. The method of claim 1, wherein the step of moving the cylindrical weight across at least a portion of the mattress comprises moving the cylindrical weight using at least one actuator operatively connected to an axle of the cylindrical weight.
3. The method of claim 2, wherein the cylindrical weight and actuator are operatively connected such that mass distribution of the cylindrical weight remains constant as the actuator moves the cylindrical weight across at least a portion of the mattress.
4. The method of any one of the preceding claims, comprising the step of positioning a static weight on the mattress.
5. The method of claim 4, wherein the static weight is a first cylinder and the cylindrical weight is a second cylinder, and the method comprises arranging the weighted cylinders with parallel rotational axes and the step of moving the 3402534v1 cylindrical weight across at least a portion of the mattress comprises moving the second cylinder towards the first cylinder.
6. The method of claim 4 or 5, further comprising determining any change in angle of the first weight in response to the cylindrical weight being moved across the mattress.
7. The method of any one of the preceding claims, wherein the step of measuring torque created by the cylindrical weight comprises measuring the output of a force gauge.
8. The method of claim 7 wherein the force gauge is located at an axle of the second cylinder.
9. The method of claim 7, wherein the force gauge is located between the actuator and the cylindrical weight.
10. The method of any one of the preceding claims wherein the cylindrical weight is moved continuously across the mattress.
11. The method of claim 10, wherein the step of measuring torque created by the cylindrical weight moving across the mattress comprises continuously, or at least substantially continuously, measuring the torque as the cylindrical weight is moved continuously across the mattress. 3402534v1
12. The method of claim 10 or 11, wherein the cylindrical weight is moved continuously across the mattress at a constant speed.
13. The method of any one of the preceding claims, wherein the weight of the cylindrical weight is varied until it has a predetermined mass.
14. The method of any one of the preceding claims, wherein the step of moving the cylindrical weight across at least a portion of the mattress comprises measuring displacement of the second weight as it is moved.
15. The method of claim 14, wherein the displacement of the second weight is measured by measuring revolutions, including any partial revolution, of the second weight as it is rolled across the mattress.
16. The method of any one of the preceding claims, wherein the cylindrical weight is pushed along the mattress by a drive system.
17. The method of any one of claims 1 to 15, wherein the cylindrical weight is pulled along the mattress by a drive system.
18. The method of claim 17, wherein the cylindrical weight is operatively connected to a pair of line members that extend from the drive system and an actuator retracts the line members which in turn pulls the weighted cylinder across the mattress. 3402534v1
19. The method of any one of the preceding claims, wherein the step of moving the cylindrical weight across at least a portion of the mattress comprises rolling the cylindrical weight across at least a portion of the mattress.
20. The method of claim 19, wherein the cylindrical weight is rolled at least one full revolution across the mattress.
21. An apparatus for testing rolling resistance of a mattress, preferably carrying out the method as hereinbefore described, the apparatus comprising: a cylindrical weight; at least one actuator operatively coupled to the cylindrical weight, the actuator being configured to move the cylindrical weight across at least a portion of the mattress; and a force gauge configured to measure torque of the cylindrical weight moving across the mattress.
22. The apparatus of claim 21, wherein the force gauge comprises a torque gauge.
23. The apparatus of claim 21 or 22, wherein the apparatus further comprises a drive system configured to move the cylindrical weight across the mattress.
24. The apparatus of claim 23, wherein the drive system is configured to push the cylindrical weight across the mattress. 3402534v1
25. The apparatus of claim 23, wherein the drive system is configured to pull the cylindrical weight across the mattress.
26. The apparatus of claim 25, wherein the drive system comprises a pair of line members that extend from the drive system to the cylindrical weight.
27. The apparatus of claim 26, wherein the drive system comprises an actuator configured to retract the line members which, in turn, pulls the weighted cylinder across the mattress.
28. The apparatus of any one of claims 21 to 27, wherein the force gauge is configured to measure torque created by the cylindrical weight moving across the mattress.
29. The apparatus of any one of claims 21 to 27, wherein the force gauge is configured to measure torque required to roll the cylindrical weight across the mattress.
30. The apparatus of any one of claims 21 to 27, wherein the apparatus comprises a static weight with an inclinometer configured to measure changes in angle of the static weight as the cylindrical weight is moved across the mattress. 3402534v1
31. The apparatus of any one of claims 21 to 28, wherein the apparatus is automated to continuously move the cylindrical weight across the mattress and to continuously, or at least substantially continuously, measure the torque created by the cylindrical weight moving across the mattress. 3402534v1
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2016904240A AU2016904240A0 (en) | 2016-10-19 | Method and apparatus for testing rolling resistance | |
AU2016904240 | 2016-10-19 | ||
PCT/AU2017/051133 WO2018071974A1 (en) | 2016-10-19 | 2017-10-19 | Method and apparatus for testing rolling resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ753662A NZ753662A (en) | 2020-12-18 |
NZ753662B2 true NZ753662B2 (en) | 2021-03-19 |
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