CA1139935A - Portable wheel truing gauge - Google Patents
Portable wheel truing gaugeInfo
- Publication number
- CA1139935A CA1139935A CA000346667A CA346667A CA1139935A CA 1139935 A CA1139935 A CA 1139935A CA 000346667 A CA000346667 A CA 000346667A CA 346667 A CA346667 A CA 346667A CA 1139935 A CA1139935 A CA 1139935A
- Authority
- CA
- Canada
- Prior art keywords
- wheel
- rim
- arms
- gauge
- bicycle
- 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.)
- Expired
Links
Classifications
-
- 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
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
-
- 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
- G01B5/20—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures
- G01B5/201—Measuring arrangements characterised by the use of mechanical techniques for measuring contours or curvatures for measuring roundness
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Braking Arrangements (AREA)
Abstract
PORTABLE WHEEL TRUING GAUGE
ABSTRACT
A pair of parallely spaced apart arms are pivotally attached to a plate member which can be attached to the fork crown of a bicycle. A rim contacting head is threadedly attached to the arms. The head is used to gauge both the roundness of the bicycle wheel and the deviation from the plane of its axis or degree of "wobble". The gauge maintains the references of the "roundness" and "wobble" while the wheel is taken in and out of the forks to tighten the wheel nipples and thereby correct the wobbles and out of truness of the wheel.
ABSTRACT
A pair of parallely spaced apart arms are pivotally attached to a plate member which can be attached to the fork crown of a bicycle. A rim contacting head is threadedly attached to the arms. The head is used to gauge both the roundness of the bicycle wheel and the deviation from the plane of its axis or degree of "wobble". The gauge maintains the references of the "roundness" and "wobble" while the wheel is taken in and out of the forks to tighten the wheel nipples and thereby correct the wobbles and out of truness of the wheel.
Description
i~3~13~i PORTABLE W~]EEL TRUING GAUGE
FIELD O~ INVENTION
The present invention relates to a device for attachment to a bicycle frame for gauging the roundness of a bicycle wheel and the deviation of the plane of the wheel from its proper position perpendicular to the wheel axle axis. In particular the invention comprises a method and means adapted to hold a reference of the roundness of the wheel and another reference of anomolies in the centering of the rim about the axle as shown by the irregularities or wobbbles in the wheel when turning. The device herein provided maintains the references while the wheel is taken in and out of the forks of the bic~cle for stressing of the spokes which are being adjusted or laced into the rim while held in the forks with the gauge and its reference means held to the forks.
PRIOR ART
The known means o~ lacing a wheel rim with spokes and of adjusting them afterwards when the wheel loses its "true", is to mount the wheel in a machine where it is capable of turning on its axis while caliper type gauges indicate to an operator where the wheel has lost its "true" and where an operator can adjust and re-adjust the spokes until the gauges of the calipers indicate that the wheel has returned to "true". By the use of the caliper reference positions a bicycle wheel can be built on the machine or more elab-orate lacing machines are used.
It has been found that the elaborate lacing machines used today and the lightweight rims and spokes required by the new generation of lightweigt bicycles produce or cause failure in the "trueness" of the wheels more frequently than heretofore~The result ~3~32~
is that bicycle owners must have the wheels taken to service shops more frequently for "truing". It is also found that with the more universal use of hand operated caliper brakes which brake on -the wheel rims more servicing of wheels that have been damaged by faulty brakes is required. The result is that many bicycle operators must either wait for service of their wheels or attempt to "true" them by their own efforts. The need for a simple but effective yauge for assisting the home mechanic is now felt and the invention herein provides such a gauge.
To ad~ust the spokes of a wheel to make it "true" four characteristics of a spoked wheel must be considered together.
The rim must be truly round. The wheel axle axis must be perpen-dicular to the plane of the circle formed by the rim. The whole of the rim must, when seen on edge, trace a straight line without irregularities or wobbles in its -path. The rim plane or axis must bisect the hub of the axle to insure that the wheel can be centred between the forks or in the case of a rear wheel, between the rear drop out slots of the frame.
A mechanic adjusting the roundness of a wheel must also remove the tire from the rim with its tube to prevent damaye to them the nipples of the spokes that protrude through the rim~triehturnet~ to Truing the wheel is accomplished by tensioning the spokes in an order dictated by a reference means showing the degree of irregularity of any particular characteristic of the wheel. The threads of the spokes are tightened into the nipples which protrude through the rim In truing a wheel the mechanic will alternately tension the spokes and then stress the wheel until the wheel is "true" again.
Tensioning involves making all of the spokes equally tight as possible. ~he tensioning of the spokes by tightening the nipples in the rim can cause the spokes to remain twisted until some external force such as riding on the wheel or stressing the wheel and rim on the floor or bench to cause the spokes to unwind. The stressing or causing the unwinding of the spokes must be done continually ~3~
during the truing process of tensioning the spokes. Each time the wheel is stressed by manually applying pressure to the wheel rim on a bench it will be found that it will have lost part of the "truing"
imparted by the tensioning operation of the spoke tightening step.
The tensioning of the spokes and the stressing of the wheel -are repeated until the wheel remains "true" after the last stressing step has been performed.
In truing a wheel however, two of the above characteristics of a "true" wheel must be determined. A means must be provided to gauge the roundness of the rim and another means must be provided for separately but simultaneously determining the straightness of the plane of the wheel to gauge the wobbles in it if an~. The reference means must also be set so that the continuous removal of the wheel from the tensioning holder, stand or jig, does not change alter or disturb the reference or setting of the gauge, until the tensioning - stressing is completed. The calipers attached to the s-tand used by service shops provide the necessary references but it is the object of the present invention to provide a portable pair of gauges assembled together and attachable to a bic~cle frame itself that will provide the references needed by the amateur in "truin~' his own bicycle.
It is known that the caliper type brakes that operate to grap the rim of the wheel to cause braking of the bicycle, are fasten-ed to the bicycle frame by means of a bolt run through an aperture in the frame. It is an object of the invention herein to use the aperture in the fork crown of the front of the frame or the aperture in the brake bridge between the seat stays of the rear of the frame to mount the reference gauge of the invention. It is known that the apertures for the brake calipers, front or rear, are centre point references for the wheels in either back or front to allow the brakes to function properly and can be used to maintain a certain fixed reference point of a wheel revolving in the forks.
~ ~3~3~
SUM~ARY OF THE INVENTION
A truing reference guide is provided by the invention herein and comprises a pair of parallely spaced apart arms each pivotably attached at one end to a bac~ plate and each having a~ree end to which is threadably attached and adjustable a rim contacting head. A cross member is attached between the top edges of the arms and has mark or notch prominently displayed in the centre of its forward edge to indicate the exact centre of the gauge between the arms. The cross member is fixed parallel to the backplate and the backplate has a centrally placed aperture for receiving a bolt member adapted to ~ix the backplate between forks of a bicycle by means of the removal of the brakes and replacement with the backplate and a bolt and wingnut fixed through the brake bolt aperture in the brake bridge of the bicycle frame. When a tire with tube is removed from a wheel rim and the rim is rotatably mounted between the forks the device is adapted as a roundness guide for the rim. The backplate is fixed parallel to the wheel axis through the axle and the arms pivot parallel to the proper plane of rotation of the wheel rim. With the tire and tube removed from the rim the cross member is lowered and raised to indicate the roudness of the rim and can be fixed at a point above the rim path o~ travel to act as the reference of trueness of the rim and thereby a guide in individual adjustment of spokes to correct irregularities in the rim roundness.
The ends of the arms are adapted to overlie the rim side edges when the arms and crossbar member are lowered toward the rim. The rim contacting heads threadably moveable axially and in parallel with the wheel axis provide centre "trueness" guide to the wheel over its hub and in relation to its own plane . When each is set opposite the rim edge it gives a reference for determining the degree of wobble to the rim which will be corrected by adjustment of the :~3~3~
spokes. When the wheel is removed to stress it on the bench or on the road under load to remove the twist to the tensioned spokes, the rim side reference heads will not be altered because the arms holding them can be pivoted upwards out of the way of the wheel being removed and replaced.
Brief Description of The Drawings A preferred embodiment of the invention is shown in the accompanying drawings wherein like reference numerals refer to like parts.
Figure one i5 a view of the invention attached to the front fork crown of a bicycle~
Figure 2 is a top plan view of the gauge prior to attachment of the bolt in the brake bridge aperture in a bicycle frame DESCRIPTION OF THE PREFERRED EMBODIMENT.
In figure 1 the device herein is designated numeral 10 and is shown attached to the fork crown 30 of a bicycle 44 with a head tube numbered 31 the forks 32, and showing a wheel xim 35 mounted between the forks 32. The wheel rim 35 is attached to an axle 40 and hub 41 by spoke members 36 threaded into the rim 35 by nipples 47.
The truing guide 10 comprises a backplate 13 mounted into the brake aperture of the fork crown 30 of the bicycle frame 44 by a bolt 12 fixed for easy removal and replacement by a wing nut.
The backplate 13 is fixed to the frame 44 to lie in parallel relatio~ to the axle 40 of the wheel rim 35 and has a paix of arms 18 pivotably atta~hed to it at 50,51, by means of a bolt 14 carri through from a bracket 26 on one end of backplate 13 to bracket 27 on the other side of backplate 13. The bolt is held in position by ~3~3S
bolt head 20 and removeable wing nut 17 to allow the arms to freely pivot with relation to the bracket of the backplate, A sleeve 15 is spaced between the arms in ~hich the bolt 14 freely rotates and a spring member 16 is tensioned against and between the arms 18 to cause the arms 18 to bind against the brackets 26,27 and thereby permit the setting of the arms in any position over the rim 35 to create the reference point 25 on a crossmember of the arms 19 to be the guide to the mechanic tensioning spokes of the rim 35.
The pivot action of the arms 18 on brackets 26,27 allows the cross bar reference member to be raised out of the way of the wheel when it is necessary to remove the wheel for removal of the spoke twist as above described as stressing the rim. By the fine adjust-ment allowed by spring 16 to the lowering of bar 19 toward the rim 35 as shown in figure 1, the spokes can be adjusted until the rim shows perfect roundness which result will be indicated by the reference point 25 not striking the rim upon its rotational movement when minimum clearance is allowed between bar 19 and rim 35.
Irregularities in the side to side movement of the rotating rim 35 is shown by wobble in the movement and is gauged by the side reference heads 24,24 which are the heads of screws 22 threadably attached to the ends of arms 18 forward and below cross member 19.
The screws~22,22 are axially aligned with one another and with the axis of the wheel 60, and each has a knob 21 attached to the outer end remote from the head 24 for fine adjustment of the head 24 to-ward the rim side of the wheel. To assist the reference head to maintain its fine adjustment when the arms are pivoted out of the way of a rim being removed for stressing, spring members 23 are fitted over the screws 22 and spaced between the knobs 21 and the outer face of the arms. In figure 2 assembly 55 is shown with the spring 23 expanded and assembly 56 shows the spring compressed when the head is moved outwards for contact with the rim edge to gauge the extent of a wobble or irregularity in the plane edge of the rim.
FIELD O~ INVENTION
The present invention relates to a device for attachment to a bicycle frame for gauging the roundness of a bicycle wheel and the deviation of the plane of the wheel from its proper position perpendicular to the wheel axle axis. In particular the invention comprises a method and means adapted to hold a reference of the roundness of the wheel and another reference of anomolies in the centering of the rim about the axle as shown by the irregularities or wobbbles in the wheel when turning. The device herein provided maintains the references while the wheel is taken in and out of the forks of the bic~cle for stressing of the spokes which are being adjusted or laced into the rim while held in the forks with the gauge and its reference means held to the forks.
PRIOR ART
The known means o~ lacing a wheel rim with spokes and of adjusting them afterwards when the wheel loses its "true", is to mount the wheel in a machine where it is capable of turning on its axis while caliper type gauges indicate to an operator where the wheel has lost its "true" and where an operator can adjust and re-adjust the spokes until the gauges of the calipers indicate that the wheel has returned to "true". By the use of the caliper reference positions a bicycle wheel can be built on the machine or more elab-orate lacing machines are used.
It has been found that the elaborate lacing machines used today and the lightweight rims and spokes required by the new generation of lightweigt bicycles produce or cause failure in the "trueness" of the wheels more frequently than heretofore~The result ~3~32~
is that bicycle owners must have the wheels taken to service shops more frequently for "truing". It is also found that with the more universal use of hand operated caliper brakes which brake on -the wheel rims more servicing of wheels that have been damaged by faulty brakes is required. The result is that many bicycle operators must either wait for service of their wheels or attempt to "true" them by their own efforts. The need for a simple but effective yauge for assisting the home mechanic is now felt and the invention herein provides such a gauge.
To ad~ust the spokes of a wheel to make it "true" four characteristics of a spoked wheel must be considered together.
The rim must be truly round. The wheel axle axis must be perpen-dicular to the plane of the circle formed by the rim. The whole of the rim must, when seen on edge, trace a straight line without irregularities or wobbles in its -path. The rim plane or axis must bisect the hub of the axle to insure that the wheel can be centred between the forks or in the case of a rear wheel, between the rear drop out slots of the frame.
A mechanic adjusting the roundness of a wheel must also remove the tire from the rim with its tube to prevent damaye to them the nipples of the spokes that protrude through the rim~triehturnet~ to Truing the wheel is accomplished by tensioning the spokes in an order dictated by a reference means showing the degree of irregularity of any particular characteristic of the wheel. The threads of the spokes are tightened into the nipples which protrude through the rim In truing a wheel the mechanic will alternately tension the spokes and then stress the wheel until the wheel is "true" again.
Tensioning involves making all of the spokes equally tight as possible. ~he tensioning of the spokes by tightening the nipples in the rim can cause the spokes to remain twisted until some external force such as riding on the wheel or stressing the wheel and rim on the floor or bench to cause the spokes to unwind. The stressing or causing the unwinding of the spokes must be done continually ~3~
during the truing process of tensioning the spokes. Each time the wheel is stressed by manually applying pressure to the wheel rim on a bench it will be found that it will have lost part of the "truing"
imparted by the tensioning operation of the spoke tightening step.
The tensioning of the spokes and the stressing of the wheel -are repeated until the wheel remains "true" after the last stressing step has been performed.
In truing a wheel however, two of the above characteristics of a "true" wheel must be determined. A means must be provided to gauge the roundness of the rim and another means must be provided for separately but simultaneously determining the straightness of the plane of the wheel to gauge the wobbles in it if an~. The reference means must also be set so that the continuous removal of the wheel from the tensioning holder, stand or jig, does not change alter or disturb the reference or setting of the gauge, until the tensioning - stressing is completed. The calipers attached to the s-tand used by service shops provide the necessary references but it is the object of the present invention to provide a portable pair of gauges assembled together and attachable to a bic~cle frame itself that will provide the references needed by the amateur in "truin~' his own bicycle.
It is known that the caliper type brakes that operate to grap the rim of the wheel to cause braking of the bicycle, are fasten-ed to the bicycle frame by means of a bolt run through an aperture in the frame. It is an object of the invention herein to use the aperture in the fork crown of the front of the frame or the aperture in the brake bridge between the seat stays of the rear of the frame to mount the reference gauge of the invention. It is known that the apertures for the brake calipers, front or rear, are centre point references for the wheels in either back or front to allow the brakes to function properly and can be used to maintain a certain fixed reference point of a wheel revolving in the forks.
~ ~3~3~
SUM~ARY OF THE INVENTION
A truing reference guide is provided by the invention herein and comprises a pair of parallely spaced apart arms each pivotably attached at one end to a bac~ plate and each having a~ree end to which is threadably attached and adjustable a rim contacting head. A cross member is attached between the top edges of the arms and has mark or notch prominently displayed in the centre of its forward edge to indicate the exact centre of the gauge between the arms. The cross member is fixed parallel to the backplate and the backplate has a centrally placed aperture for receiving a bolt member adapted to ~ix the backplate between forks of a bicycle by means of the removal of the brakes and replacement with the backplate and a bolt and wingnut fixed through the brake bolt aperture in the brake bridge of the bicycle frame. When a tire with tube is removed from a wheel rim and the rim is rotatably mounted between the forks the device is adapted as a roundness guide for the rim. The backplate is fixed parallel to the wheel axis through the axle and the arms pivot parallel to the proper plane of rotation of the wheel rim. With the tire and tube removed from the rim the cross member is lowered and raised to indicate the roudness of the rim and can be fixed at a point above the rim path o~ travel to act as the reference of trueness of the rim and thereby a guide in individual adjustment of spokes to correct irregularities in the rim roundness.
The ends of the arms are adapted to overlie the rim side edges when the arms and crossbar member are lowered toward the rim. The rim contacting heads threadably moveable axially and in parallel with the wheel axis provide centre "trueness" guide to the wheel over its hub and in relation to its own plane . When each is set opposite the rim edge it gives a reference for determining the degree of wobble to the rim which will be corrected by adjustment of the :~3~3~
spokes. When the wheel is removed to stress it on the bench or on the road under load to remove the twist to the tensioned spokes, the rim side reference heads will not be altered because the arms holding them can be pivoted upwards out of the way of the wheel being removed and replaced.
Brief Description of The Drawings A preferred embodiment of the invention is shown in the accompanying drawings wherein like reference numerals refer to like parts.
Figure one i5 a view of the invention attached to the front fork crown of a bicycle~
Figure 2 is a top plan view of the gauge prior to attachment of the bolt in the brake bridge aperture in a bicycle frame DESCRIPTION OF THE PREFERRED EMBODIMENT.
In figure 1 the device herein is designated numeral 10 and is shown attached to the fork crown 30 of a bicycle 44 with a head tube numbered 31 the forks 32, and showing a wheel xim 35 mounted between the forks 32. The wheel rim 35 is attached to an axle 40 and hub 41 by spoke members 36 threaded into the rim 35 by nipples 47.
The truing guide 10 comprises a backplate 13 mounted into the brake aperture of the fork crown 30 of the bicycle frame 44 by a bolt 12 fixed for easy removal and replacement by a wing nut.
The backplate 13 is fixed to the frame 44 to lie in parallel relatio~ to the axle 40 of the wheel rim 35 and has a paix of arms 18 pivotably atta~hed to it at 50,51, by means of a bolt 14 carri through from a bracket 26 on one end of backplate 13 to bracket 27 on the other side of backplate 13. The bolt is held in position by ~3~3S
bolt head 20 and removeable wing nut 17 to allow the arms to freely pivot with relation to the bracket of the backplate, A sleeve 15 is spaced between the arms in ~hich the bolt 14 freely rotates and a spring member 16 is tensioned against and between the arms 18 to cause the arms 18 to bind against the brackets 26,27 and thereby permit the setting of the arms in any position over the rim 35 to create the reference point 25 on a crossmember of the arms 19 to be the guide to the mechanic tensioning spokes of the rim 35.
The pivot action of the arms 18 on brackets 26,27 allows the cross bar reference member to be raised out of the way of the wheel when it is necessary to remove the wheel for removal of the spoke twist as above described as stressing the rim. By the fine adjust-ment allowed by spring 16 to the lowering of bar 19 toward the rim 35 as shown in figure 1, the spokes can be adjusted until the rim shows perfect roundness which result will be indicated by the reference point 25 not striking the rim upon its rotational movement when minimum clearance is allowed between bar 19 and rim 35.
Irregularities in the side to side movement of the rotating rim 35 is shown by wobble in the movement and is gauged by the side reference heads 24,24 which are the heads of screws 22 threadably attached to the ends of arms 18 forward and below cross member 19.
The screws~22,22 are axially aligned with one another and with the axis of the wheel 60, and each has a knob 21 attached to the outer end remote from the head 24 for fine adjustment of the head 24 to-ward the rim side of the wheel. To assist the reference head to maintain its fine adjustment when the arms are pivoted out of the way of a rim being removed for stressing, spring members 23 are fitted over the screws 22 and spaced between the knobs 21 and the outer face of the arms. In figure 2 assembly 55 is shown with the spring 23 expanded and assembly 56 shows the spring compressed when the head is moved outwards for contact with the rim edge to gauge the extent of a wobble or irregularity in the plane edge of the rim.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A portable wheel truing gauge comprising in combination;
a back plate having a central aperture therein adapted to receive a bolt fastened into the brake bolt aperture in the brake bridge of a bicycle frame;
a pair of parallely spaced apart arms each having two ends thereto, and each perpendicularly and pivotably attached at one of their two ends to said back plate;
a bicycle rim contacting means adjustably moveable inwardly and out-wardly of said gauge and attached to at least one of said arms adjacent the other one of the ends thereof, and moveable in a path parallel to said brake bridge and the axle of a bicycle wheel fixed in the forks of said frame;
and means associated with said rim contacting means to fix the adjustment thereof in relation to said arm.
a back plate having a central aperture therein adapted to receive a bolt fastened into the brake bolt aperture in the brake bridge of a bicycle frame;
a pair of parallely spaced apart arms each having two ends thereto, and each perpendicularly and pivotably attached at one of their two ends to said back plate;
a bicycle rim contacting means adjustably moveable inwardly and out-wardly of said gauge and attached to at least one of said arms adjacent the other one of the ends thereof, and moveable in a path parallel to said brake bridge and the axle of a bicycle wheel fixed in the forks of said frame;
and means associated with said rim contacting means to fix the adjustment thereof in relation to said arm.
2. A portable wheel truing gauge as in claim 1, having a cross member attached to and between the top edges of said arms parallel to said back plate and having a mark thereon to indicate the centre point between said arms.
3. A portable wheel truing gauge as in claim 1 having means associated with the ones of the ends of said arms adjacent the backplate for adjustably fixing the arms in a pivot positionover the wheel rim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000346667A CA1139935A (en) | 1980-02-28 | 1980-02-28 | Portable wheel truing gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000346667A CA1139935A (en) | 1980-02-28 | 1980-02-28 | Portable wheel truing gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1139935A true CA1139935A (en) | 1983-01-25 |
Family
ID=4116355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000346667A Expired CA1139935A (en) | 1980-02-28 | 1980-02-28 | Portable wheel truing gauge |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1139935A (en) |
-
1980
- 1980-02-28 CA CA000346667A patent/CA1139935A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |