GB2471383A - Self-centring rowing-boat span-gauges - Google Patents

Self-centring rowing-boat span-gauges Download PDF

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Publication number
GB2471383A
GB2471383A GB1010474A GB201010474A GB2471383A GB 2471383 A GB2471383 A GB 2471383A GB 1010474 A GB1010474 A GB 1010474A GB 201010474 A GB201010474 A GB 201010474A GB 2471383 A GB2471383 A GB 2471383A
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United Kingdom
Prior art keywords
span
boat
links
feet
self
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB1010474A
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GB201010474D0 (en
GB2471383B (en
Inventor
John Frayn Ewans
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Individual
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Individual
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Filing date
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Publication of GB201010474D0 publication Critical patent/GB201010474D0/en
Publication of GB2471383A publication Critical patent/GB2471383A/en
Application granted granted Critical
Publication of GB2471383B publication Critical patent/GB2471383B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/02—Rulers with scales or marks for direct reading
    • G01B3/04—Rulers with scales or marks for direct reading rigid
    • G01B3/06—Rulers with scales or marks for direct reading rigid folding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B79/00—Monitoring properties or operating parameters of vessels in operation
    • B63B9/08—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/16—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring distance of clearance between spaced objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/02—Rulers with scales or marks for direct reading
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/02—Rulers with scales or marks for direct reading
    • G01B3/04—Rulers with scales or marks for direct reading rigid
    • G01B3/08—Rulers with scales or marks for direct reading rigid extensible
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10—Measuring tapes
    • G01B3/1041—Measuring tapes characterised by casings
    • G01B3/1046—Details of external structure thereof, e.g. shapes for ensuring firmer hold
    • G01B3/1048—Integrated means for affixing or holding
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10—Measuring tapes
    • G01B3/1071—Separate means for supporting or affixing measuring tapes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10—Measuring tapes
    • G01B3/1084—Tapes combined with arrangements for functions other than measuring lengths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0023—Measuring of sport goods, e.g. bowling accessories, golfclubs, game balls
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/0025—Measuring of vehicle parts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B34/00—Vessels specially adapted for water sports or leisure; Body-supporting devices specially adapted for water sports or leisure
    • B63B34/30—Rowing boats specially adapted for racing; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H16/00—Marine propulsion by muscle power
    • B63H16/06—Rowlocks; Mountings therefor
    • G01B2003/1048—
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/10—Measuring tapes
    • G01B3/1071—Separate means for supporting or affixing measuring tapes
    • G01B2003/1074—Separate means for supporting or affixing measuring tapes associated with the casings

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)

Abstract

A rowing boat span-gauge 1 includes a folded rule 2 (see fig. 2) which is carried by a tube 3 that is mounted on a self-centring mechanism 4. The mechanism 4 (see fig. 2) involves collars 5 and 6 that slide on the tube 3 and are interconnected by two pairs of links 7 and 8 of a parallelogram linkage which maintains the tube 3 centred upright between feet 9 of the links 7. For span ('spread') measurement, the feet 9 are located in seat-runners 21 of the boat 20 and the rule 2 is extended to the swivel-pin 25 of an oarlock 26 of the boat from a folded, retracted condition partly within the tube 3. The folded rule 2 may be replaced by a spring-returned measuring tape 31 or a laser distance-measuring instrument.

Description

Rowing-Boat Span-Gauges This invention relates to span gauges for rowing boats.
The term "span" is used herein to refer to the distance from the centre-line of the boat to the swivel-pin of a relevant oarlock.
Although this distance is more strictly termed "spread", it is very commonly referred to as "span" and this latter term is used for it herein.
A known form of gauge used for determining span does so based on an assumption that the centre-line of the boat is half-way between the gunwales or saxboards of the boat. This assumption can lead to inaccuracy in the measurement since the gunwales or saxboards may be distorted. Furthermore, in the case of single-seat sculling boats the saxboards are generally too low for the known gauge to be used.
It is an object of the present invention to provide a span gauge for a rowing boat, for providing a measurement of span that is more-directly related to the centre-line of the boat and does not depend on the structure or condition of the gunwales or saxboards.
According to one aspect of the present invention there is provided a span gauge for a rowing boat, wherein a support for carrying distance-measuring means is mounted on a self-centring mechanism that has feet for engaging seat-runners of the boat, the self-centring mechanism is operable to centre the support between the feet, and wherein the distance-measuring means is operable to provided measurement of distance between the support and a swivel-pin of an oarlock of the boat.
The distance-measuring means may be a folding or telescopic rule, or a retractable tape which is extendable from the support to the pivot pin of the oarlock to provide the span measurement.
Alternatively, it may be a distance-measuring instrument of the kind which involves a laser beam for focussing on the target swivel-pin.
The self-centring mechanism may include a form of parallelogram linkage. More especially, the feet of the mechanism may be defined by respective ends of a first pair of links which are pivoted together and which establish two adjacent sides of the parallelogram linkage. The other two sides of the parallelogram may then be established by a second pair of links which are pivoted together and which are also pivoted to respective ones of the two links of the first pair. In these circumstances, the location of the support may be defined by the diagonal of the parallelogram linkage extending between the pivot points of the first and second pairs of links, such that the support will be maintained mid-way between the feet.
A rowing-boat span-gauge in accordance with the present invention will now be described, by way of example, with reference to the accompanying drawings, in which; Figures 1 and 2 show the span-gauge according to the invention in folded-and partially-extended conditions respectively; Figure 3 is illustrative of the span-gauge of Figures 1 and 2 when extended; Figure 4 shows the span-gauge of Figures 1 to 3 in its fully-extended condition, deployed for span measurement of a rowing boat; and Figure 5 is illustrative of a possible modification of the span-gauge of Figures 1 to 3.
Referring to Figures 1 to 3, the span-gauge 1 of this example involves a foldable rule 2 which is carried by a straight support tube 3 that is mounted on a self-centring mechanism 4. The mechanism 4 includes collars 5 and 6 that slide longitudinally on the tube 3 with friction fit. The collars 5 and 6 are interconnected by two pairs of pivoted links 7 and 8. More particularly, the two links 7, which terminate in feet 9, are coupled together to the collar 5 via a common pivot 10, whereas the two links 8 are coupled together to the collar 6 via a common pivot 11 and individually via pivots 12 to intermediate locations of the two links 7 respectively.
The spacing of each pivot 12 from the pivot 10 is the same as its spacing from the pivot 11 so that a parallelogram linkage is formed with the tube 3 effectively defining a diagonal between the pivots 10 and 11 and bisecting the (diagonal) distance between the pivots 12. Thus, since the links 7 are of the same length as one another, the tube 3 is maintained centred between the feet 9 irrespective of the spacing between them. In addition, the centring of the tube 3 between the feet 9 is unaffected by any sliding adjustment of it up or down within the collars 5 and 6 for varying the height of the rule 2 above the feet 9.
The rule 2 is made up of four laths 13 (only three shown in Figure 3) that are pivoted together end-to-end so that they are swivelable one upon another into a compact folded condition. In this folded condition the rule 2 is accommodated for storage, partly within the tube 3 and partly projecting from its upper end 14, as illustrated in Figures 1 and 2. The rule 2 is attached to a boss 15 which for storage of the rule 2 is slid down to the bottom, closed end 16 of the tube 3 drawing the folded rule 3 with it. When the rule 2 is to be deployed for measurement of span the part of it projecting from the tube 3 is pulled upwardly to withdraw it fully from the tube 3 in its folded condition.
This brings the boss 15 to the upper end 14 of the tube 3 and allows the laths 13 to be swivelled open into longitudinal alignment with one another as illustrated in Figure 3.
Use of the gauge 1 to provide a measurement of span of a rowing boat is illustrated in Figure 4 and will now be described in relation to determining the span for a starboard oarlock; the span for a port oarlock (not shown) is determined correspondingly.
Referring to Figure 4, the gauge 1 is positioned in the rowing boat 20 with its feet 9 located respectively in the rails or runners 21 of the rower's sliding seat 22. The self-centring mechanism 4 of the gauge 1 automatically locates the support tube 3 upright mid-way between the rails or runners 21, and since the runners 21 are fixed symmetrically either side of the centre-line of the boat 20, this positions the tube 3 in register with the centre-line.
The rule 2 is fully extended alongside the relevant rigger 23 of the boat to locate end-graduations 24 of the rule 2 adjacent the swivel-pin 25 of the oarlock 26. The distance from the centre-line of the boat 20 to the swivel-pin 25, namely the span, is thus directly readable from the graduations 24. The use of the tube 3 centred upright between the feet 9 has the advantage that it enables the height of the rule 2 to be readily adjusted to the height of the oarlock 26.
Instead of providing the itance-measuring means in the form of the folding rule 2 as described above, it may take the form, as illustrated by Figure 5, of a measuring-tape unit 30 mounted on the upper end 14 of the tube 3 for spring-controlled retraction of its measuring tape 31. As an alternative, it may be provided as a tubular device that is telescopically extendable and has end-graduations for use in reading off the span.

Claims (10)

  1. Claims: 1. A span gauge for a rowing boat, wherein a support for carrying distance-measuring means is mounted on a self-centring mechanism that has feet for engaging seat-runners of the boat, the self-centring mechanism is operable to centre the support between the feet, and wherein the distance-measuring means is operable to provided measurement of distance between the support and a swivel-pin of an oarlock of the boat.
  2. 2. A span gauge according to Claim 1 wherein the distance-measuring means is a folding or telescopic rule.
  3. 3. A span gauge according to Claim 1 wherein the distance-measuring means is a retractable tape.
  4. 4. A span gauge according to any one of Claims 1 to 3 wherein the self-centring mechanism includes a parallelogram linkage.
  5. 5. A span gauge according to Claim 4 wherein the feet of the self-centring mechanism are respective ends of a first pair of links which are pivoted together and which establish two adjacent sides of the parallelogram linkage, and wherein the other two sides of the parallelogram linkage are established by a second pair of links which are pivoted together and which are also pivoted to respective ones of the two links of the first pair.
  6. 6. A span gauge according to Claim 5 wherein the support is an elongate member on which the pivot point of the first pair of links and the pivot point of the second pair of links are slidably mounted for maintaining the said member mid-way between the feet.
  7. 7. A span gauge according to Claim 6 wherein the elongate member is tubular.
  8. 8. A span gauge according to Claim 6 or Claim 7 wherein the distance-measuring means is mounted on one end of said member.
  9. 9. A span gauge for a rowing boat, substantially as hereinbefore described with reference to Figures 1 to 4 of the accompanying drawings.
  10. 10. A span gauge for a rowing boat, substantially as hereinbefore described with reference to Figure 5 of the accompanying drawings.
GB1010474.3A 2009-06-22 2010-06-22 Rowing-boat span-gauges Expired - Fee Related GB2471383B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB0910666.7A GB0910666D0 (en) 2009-06-22 2009-06-22 Rowing-boat span-guages

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GB201010474D0 GB201010474D0 (en) 2010-08-04
GB2471383A true GB2471383A (en) 2010-12-29
GB2471383B GB2471383B (en) 2012-02-01

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GBGB0910666.7A Ceased GB0910666D0 (en) 2009-06-22 2009-06-22 Rowing-boat span-guages
GB1010474.3A Expired - Fee Related GB2471383B (en) 2009-06-22 2010-06-22 Rowing-boat span-gauges

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108871143A (en) * 2018-09-11 2018-11-23 奇瑞汽车股份有限公司 Seat cubing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3709187A1 (en) * 1987-03-20 1988-09-29 Michael Schwager Rowlock height measuring device for rowboats
US5044090A (en) * 1990-10-15 1991-09-03 Hunter Mark A Truck span measuring apparatus
US5398419A (en) * 1993-11-01 1995-03-21 Cooper Industries, Inc. Methods and apparatus for facilitating a measurement taken from a vehicle wheel axis
CA2430418A1 (en) * 2003-05-29 2004-11-29 Michael S. Stewart Self-centering tool for measuring or adjusting the position of an oarlock relative to the centerline of a racing shell
GB2403808A (en) * 2003-06-12 2005-01-12 John Frayn Ewans An instrument for measuring the rigger-spread of a boat

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3709187A1 (en) * 1987-03-20 1988-09-29 Michael Schwager Rowlock height measuring device for rowboats
US5044090A (en) * 1990-10-15 1991-09-03 Hunter Mark A Truck span measuring apparatus
US5398419A (en) * 1993-11-01 1995-03-21 Cooper Industries, Inc. Methods and apparatus for facilitating a measurement taken from a vehicle wheel axis
CA2430418A1 (en) * 2003-05-29 2004-11-29 Michael S. Stewart Self-centering tool for measuring or adjusting the position of an oarlock relative to the centerline of a racing shell
GB2403808A (en) * 2003-06-12 2005-01-12 John Frayn Ewans An instrument for measuring the rigger-spread of a boat

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108871143A (en) * 2018-09-11 2018-11-23 奇瑞汽车股份有限公司 Seat cubing

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Publication number Publication date
GB0910666D0 (en) 2009-08-05
GB201010474D0 (en) 2010-08-04
GB2471383B (en) 2012-02-01

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20150622