CA2192873A1 - Structure of a drum brake for bicycles - Google Patents
Structure of a drum brake for bicyclesInfo
- Publication number
- CA2192873A1 CA2192873A1 CA 2192873 CA2192873A CA2192873A1 CA 2192873 A1 CA2192873 A1 CA 2192873A1 CA 2192873 CA2192873 CA 2192873 CA 2192873 A CA2192873 A CA 2192873A CA 2192873 A1 CA2192873 A1 CA 2192873A1
- Authority
- CA
- Canada
- Prior art keywords
- brake
- hub
- bicycles
- screw rod
- brake blocks
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/16—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis
- F16D51/32—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with three or more brake shoes
- F16D51/40—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with three or more brake shoes all extending in the same direction from their pivots
- F16D51/42—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as brake-shoes pivoted on a fixed or nearly-fixed axis with three or more brake shoes all extending in the same direction from their pivots mechanically actuated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L1/00—Brakes; Arrangements thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L3/00—Brake-actuating mechanisms; Arrangements thereof
- B62L3/02—Brake-actuating mechanisms; Arrangements thereof for control by a hand lever
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Braking Arrangements (AREA)
Abstract
Le précis n'est pas disponible en Abstract Not Yet Available ce moment
Description
219287~
TITLE: AN INPROVEMENT IN T~E Sl~u~-lu~E OF A DR~M BRAKE FOR
BICYCLES
This invention relates to an improvement in the structure of a drum brake for bicycles.
The structure of a most commonly used drum brake is illustrated in FIG. 7. As shown, the drum brake 30 utilizes a arm 35 to rotate a rectangular block 34 to drive a pair of brake shoes 31 which are connected at an end by a pivot 32 thereby eYp~n~; ng the brake shoes 31 to contact the inner surface of a hub 20 and therefore reducing speed or stopping motion of a bicycle. Further, two springs 33 are provided for returning the brake shoes 31 to their original positions when the brake is released.
~owever, such a drum brake suffers from the following drawbacks:
1. The contact area between the brake shoes 31 and the inner surface of the hub is small thereby making it impossi~le to apply brake effectively.
TITLE: AN INPROVEMENT IN T~E Sl~u~-lu~E OF A DR~M BRAKE FOR
BICYCLES
This invention relates to an improvement in the structure of a drum brake for bicycles.
The structure of a most commonly used drum brake is illustrated in FIG. 7. As shown, the drum brake 30 utilizes a arm 35 to rotate a rectangular block 34 to drive a pair of brake shoes 31 which are connected at an end by a pivot 32 thereby eYp~n~; ng the brake shoes 31 to contact the inner surface of a hub 20 and therefore reducing speed or stopping motion of a bicycle. Further, two springs 33 are provided for returning the brake shoes 31 to their original positions when the brake is released.
~owever, such a drum brake suffers from the following drawbacks:
1. The contact area between the brake shoes 31 and the inner surface of the hub is small thereby making it impossi~le to apply brake effectively.
2. Once the brake shoes are worn out and the rectangular block 34 is not adjusted in time, brake 21 g28 7~
failure will easily occur.
Therefore, it is an object of the present invention to provide an improvement in the structure of a drum brake for bicycles which can obviate and mitigate the above-mentioned drawbacks.
This invention relates to an improvement in the structure of a drum brake for bicycles.
It is the primary object of the present invention to provide an improvement in the structure of a drum brake for bicycles which can effectively reduce the speed or stop the motion of bicycle.
It is another object of the present invention to provide an improvement in the structure of a drum brake for bicycles which is sensitive in operation.
It is still another object to provide an improvement in the structure of a drum brake for bicycles which is durable in use.
It is still another object to provide an improvement in the structure of a drum brake for bicycles which is easy to assemble.
2l9287~
It is a further object of the present invention to provide an improvement in the structure of a drum brake for bicycles which is low in cost.
Other objects of the invention will in part be obvious and in part hereinafter pointed out.
The invention accordingly consists of features of constructions and method, combination of elements, arrangement of parts and steps of the method which will be exemplified in the constructions and method hereinafter disclosed, the scope of the application of which will be indicated in the claims following.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an exploded view of the present invention;
FIG. 3 is an exploded view of the triangular rotor;
FIG. 4 illustrates the working principle of the present invention;
FIG. 5 is a sectional view of the present invention;
FIG. 6 i~ a working view of the present invention and 87~
FIG. 7 illustrates the structure of a prior art drum brake for bicycles.
For the purpose to promoting an understAn~; ng of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings. Specific language will be used to describe same. It will, nevertheless, be understood that no limitation of the scope o$ the invention is thereby intended, such alternations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates.
With reference to the drawings and in particular to FIGS. 1, 2 and 3 thereof, the drum brake for bicycles according to the present invention mainly comprises a a hub 20, a brake means 10 The hub 20 is a cylindrical member with a flange 21 at bot~ sides and a circular rece~A 211 at one end thereof. A screw rod 22 extends through the hub 10 and 2lg2873 supported by a bearing (not shown) arranged within the hub 20. A circular packing 13 is formed with a center hole 131 and disposed within the circular recess 211 of the hub 20, with the screw rod 22 ext~n~;ng through the center hole 131.
A brake means 10 which includes three brake blocks 11 is fitted on the screw rod 22 and installed within the circular recess 211 of the hub 21. Each of the brake block 11 is formed with a curved surface at the outer side, a flat surface at the inner side, a hole 111 at an end, and a curved groove 115 along the curved surface.
The three brake blocks 11 are arranged together by engaging a retainer ring 113 with the grooves 115 of the brake blocks 11 so that there is a triangular space between the brake blocks 11. A triangular rotor 112 is fitted into the triangular space between the brake blocks 11. The triangular rotor 112 is formed with a cylindrical portion 1121 at an end and a square portion 1122 at an end of the cylindrical portion 1121. Further, the triangular rotor 112 has an axial through hole 114 for the passage of .~
the screw rod 22.
A positioning means 12 including a positioning plate 121 is mounted on the brake means 10. On the right side (see FIGS. 2 and 5) of the positioning plate 121 there is a tubular portion 123 having three guide rods 124. The positioning plate 121 has an opening 125 coaxial with the tubular portion 123 for the passage of the screw rod 22, the cylindrical portion 1121 and the sguare portion 1122.
The guide rods 124 of the positioning plate 121 are slidably inserted into the holes 111 of the brake blocks 11. The square portion 1122 of the triangular rotor 112 extends through the positioning plate 121 to engage with a square hole 141 of an arm 14. The arm 14 is designed to be connected to a brake cable (not shown). A nut 221 is engaged with the screw rod 22 to prevent the arm 14 from being disengaged from the triangular rotor 112. A torsion spring 15 is fitted over the screw rod 22, abutting against the nut 221. A co~er 16 having a protruded portion 161 at the central portion is fixedly mounted on the positioning plate 121 by bolts 17, with the screw rod 219~73 22 ext~n~;ng through the center hole 162 of the cover 16.
The cover 16 has a notch 163 for engaging with a leg of the torsion spring 15. The other leg of the torsion spring 15 is engaged with the arm 14. Two nuts 221 are mounted on the screw rod 22 for fixing the cover 16 on the positioning plate 121.
When the brake cable is pulled to apply brake, the arm 14 will be first rotated thereby turning the triangular rotor 112. In the meantime, the brake blocks 11 will be forced by the triangular rotor 112 to go outwards thus bearing against the inner side of the hub 20. Hence, the hub 20 will be reduced in speed or stopped in motion. As the brake cable is released, the torsion spring 15 will return the arm 14 to its original position which will in turn rotate the triangular rotor 112 to its normal position. Thus, the brake blocks 11 will no longer bear against the inner wall of the hub 20.
HOWeV~L, it should be noted that the triangular rotor 112 may be replaced with a polygonal member.
In conclusion, the drum brake according to the 21g2873 present invention has the following advantages over the prior art:
1. The drum brake utilizes three brake blocks to contact the inner wall of the hub thereby providing a larger contact area between the brake blocks and the inner wall of the hub than the prior art and therefore making more effective to apply brake.
2. The three brake blocks will apply forces on the inner wall of the hub evenly and this will increase the braking sensitivity and shorten the time for stopping motion of a bicycle.
The invention is naturally not limited in any sense to the particular features specified in the forgoing or to the details of the particular embodiment which has been chosen in order to illustrate the invention.
Consideration can be given to all kinds of variants of the particular embodiment which has been described by way of example and of its constituent elements without thereby departing ~rom the scope of the invention. This invention accordingly includes all the means constituting technical equivalents of the means described as well as their combinations.
failure will easily occur.
Therefore, it is an object of the present invention to provide an improvement in the structure of a drum brake for bicycles which can obviate and mitigate the above-mentioned drawbacks.
This invention relates to an improvement in the structure of a drum brake for bicycles.
It is the primary object of the present invention to provide an improvement in the structure of a drum brake for bicycles which can effectively reduce the speed or stop the motion of bicycle.
It is another object of the present invention to provide an improvement in the structure of a drum brake for bicycles which is sensitive in operation.
It is still another object to provide an improvement in the structure of a drum brake for bicycles which is durable in use.
It is still another object to provide an improvement in the structure of a drum brake for bicycles which is easy to assemble.
2l9287~
It is a further object of the present invention to provide an improvement in the structure of a drum brake for bicycles which is low in cost.
Other objects of the invention will in part be obvious and in part hereinafter pointed out.
The invention accordingly consists of features of constructions and method, combination of elements, arrangement of parts and steps of the method which will be exemplified in the constructions and method hereinafter disclosed, the scope of the application of which will be indicated in the claims following.
FIG. 1 is a perspective view of the present invention;
FIG. 2 is an exploded view of the present invention;
FIG. 3 is an exploded view of the triangular rotor;
FIG. 4 illustrates the working principle of the present invention;
FIG. 5 is a sectional view of the present invention;
FIG. 6 i~ a working view of the present invention and 87~
FIG. 7 illustrates the structure of a prior art drum brake for bicycles.
For the purpose to promoting an understAn~; ng of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings. Specific language will be used to describe same. It will, nevertheless, be understood that no limitation of the scope o$ the invention is thereby intended, such alternations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated herein being contemplated as would normally occur to one skilled in the art to which the invention relates.
With reference to the drawings and in particular to FIGS. 1, 2 and 3 thereof, the drum brake for bicycles according to the present invention mainly comprises a a hub 20, a brake means 10 The hub 20 is a cylindrical member with a flange 21 at bot~ sides and a circular rece~A 211 at one end thereof. A screw rod 22 extends through the hub 10 and 2lg2873 supported by a bearing (not shown) arranged within the hub 20. A circular packing 13 is formed with a center hole 131 and disposed within the circular recess 211 of the hub 20, with the screw rod 22 ext~n~;ng through the center hole 131.
A brake means 10 which includes three brake blocks 11 is fitted on the screw rod 22 and installed within the circular recess 211 of the hub 21. Each of the brake block 11 is formed with a curved surface at the outer side, a flat surface at the inner side, a hole 111 at an end, and a curved groove 115 along the curved surface.
The three brake blocks 11 are arranged together by engaging a retainer ring 113 with the grooves 115 of the brake blocks 11 so that there is a triangular space between the brake blocks 11. A triangular rotor 112 is fitted into the triangular space between the brake blocks 11. The triangular rotor 112 is formed with a cylindrical portion 1121 at an end and a square portion 1122 at an end of the cylindrical portion 1121. Further, the triangular rotor 112 has an axial through hole 114 for the passage of .~
the screw rod 22.
A positioning means 12 including a positioning plate 121 is mounted on the brake means 10. On the right side (see FIGS. 2 and 5) of the positioning plate 121 there is a tubular portion 123 having three guide rods 124. The positioning plate 121 has an opening 125 coaxial with the tubular portion 123 for the passage of the screw rod 22, the cylindrical portion 1121 and the sguare portion 1122.
The guide rods 124 of the positioning plate 121 are slidably inserted into the holes 111 of the brake blocks 11. The square portion 1122 of the triangular rotor 112 extends through the positioning plate 121 to engage with a square hole 141 of an arm 14. The arm 14 is designed to be connected to a brake cable (not shown). A nut 221 is engaged with the screw rod 22 to prevent the arm 14 from being disengaged from the triangular rotor 112. A torsion spring 15 is fitted over the screw rod 22, abutting against the nut 221. A co~er 16 having a protruded portion 161 at the central portion is fixedly mounted on the positioning plate 121 by bolts 17, with the screw rod 219~73 22 ext~n~;ng through the center hole 162 of the cover 16.
The cover 16 has a notch 163 for engaging with a leg of the torsion spring 15. The other leg of the torsion spring 15 is engaged with the arm 14. Two nuts 221 are mounted on the screw rod 22 for fixing the cover 16 on the positioning plate 121.
When the brake cable is pulled to apply brake, the arm 14 will be first rotated thereby turning the triangular rotor 112. In the meantime, the brake blocks 11 will be forced by the triangular rotor 112 to go outwards thus bearing against the inner side of the hub 20. Hence, the hub 20 will be reduced in speed or stopped in motion. As the brake cable is released, the torsion spring 15 will return the arm 14 to its original position which will in turn rotate the triangular rotor 112 to its normal position. Thus, the brake blocks 11 will no longer bear against the inner wall of the hub 20.
HOWeV~L, it should be noted that the triangular rotor 112 may be replaced with a polygonal member.
In conclusion, the drum brake according to the 21g2873 present invention has the following advantages over the prior art:
1. The drum brake utilizes three brake blocks to contact the inner wall of the hub thereby providing a larger contact area between the brake blocks and the inner wall of the hub than the prior art and therefore making more effective to apply brake.
2. The three brake blocks will apply forces on the inner wall of the hub evenly and this will increase the braking sensitivity and shorten the time for stopping motion of a bicycle.
The invention is naturally not limited in any sense to the particular features specified in the forgoing or to the details of the particular embodiment which has been chosen in order to illustrate the invention.
Consideration can be given to all kinds of variants of the particular embodiment which has been described by way of example and of its constituent elements without thereby departing ~rom the scope of the invention. This invention accordingly includes all the means constituting technical equivalents of the means described as well as their combinations.
Claims (2)
1. A drum brake for bicycles comprising:
a cylindrical hub having a flange at both sides and a circular recess at an end thereof;
a screw rod extending through said hub and supported by a bearing arranged within said hub;
brake means including a rotor and three brake blocks fitted on said screw rod and installed with said circular recess, each of said brake blocks being formed with a curved surface at an outer side, a flat surface at an inner side, a hole at an end and a curved groove along said curved surface, said three brake blocks being arranged together by engaging a retainer ring with said groove thereby forming a space between said brake blocks, said rotor being fitted in said space and having a triangular portion, a square portion at an end thereof, a cylindrical portion between said portion and said square portion, and an axial through hole receiving said screw rod;
a positioning plate provided with three guide rods adapted to be slidably engaged with respective hole of said brake blocks;
an arm having a square opening receiving said square portion;
a torsion spring bearing against said arm; and a cover fixedly mounted on said positioning plate.
a cylindrical hub having a flange at both sides and a circular recess at an end thereof;
a screw rod extending through said hub and supported by a bearing arranged within said hub;
brake means including a rotor and three brake blocks fitted on said screw rod and installed with said circular recess, each of said brake blocks being formed with a curved surface at an outer side, a flat surface at an inner side, a hole at an end and a curved groove along said curved surface, said three brake blocks being arranged together by engaging a retainer ring with said groove thereby forming a space between said brake blocks, said rotor being fitted in said space and having a triangular portion, a square portion at an end thereof, a cylindrical portion between said portion and said square portion, and an axial through hole receiving said screw rod;
a positioning plate provided with three guide rods adapted to be slidably engaged with respective hole of said brake blocks;
an arm having a square opening receiving said square portion;
a torsion spring bearing against said arm; and a cover fixedly mounted on said positioning plate.
2. The drum brake for bicycles as claimed in Claim 1, wherein said rotor is replaced with a polygonal member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96201558U CN2249204Y (en) | 1996-01-22 | 1996-01-22 | Drum-type braking device |
| CN96201558.X | 1996-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2192873A1 true CA2192873A1 (en) | 1997-07-23 |
Family
ID=5130664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2192873 Abandoned CA2192873A1 (en) | 1996-01-22 | 1996-12-13 | Structure of a drum brake for bicycles |
Country Status (6)
| Country | Link |
|---|---|
| KR (1) | KR970049458U (en) |
| CN (1) | CN2249204Y (en) |
| CA (1) | CA2192873A1 (en) |
| FR (1) | FR2743773B3 (en) |
| IT (1) | IT239881Y1 (en) |
| NL (1) | NL1004913C2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107600120A (en) * | 2017-10-24 | 2018-01-19 | 北京交通大学 | A kind of electric stair climbing mechanism based on slider-crank mechanism |
| CN108825680A (en) * | 2018-08-09 | 2018-11-16 | 郭千华 | A kind of drum brake |
-
1996
- 1996-01-22 CN CN96201558U patent/CN2249204Y/en not_active Expired - Fee Related
- 1996-12-13 CA CA 2192873 patent/CA2192873A1/en not_active Abandoned
- 1996-12-24 IT IT96TO000266 patent/IT239881Y1/en active
- 1996-12-30 FR FR9616173A patent/FR2743773B3/en not_active Expired - Fee Related
- 1996-12-30 NL NL1004913A patent/NL1004913C2/en not_active IP Right Cessation
-
1997
- 1997-01-16 KR KR2019970000510U patent/KR970049458U/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| FR2743773B3 (en) | 1997-12-19 |
| NL1004913A1 (en) | 1997-07-25 |
| ITTO960266U1 (en) | 1998-06-24 |
| CN2249204Y (en) | 1997-03-12 |
| IT239881Y1 (en) | 2001-03-13 |
| NL1004913C2 (en) | 1997-10-15 |
| KR970049458U (en) | 1997-08-12 |
| FR2743773A3 (en) | 1997-07-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |