CA1230833A - Caliper brake for bicycle - Google Patents
Caliper brake for bicycleInfo
- Publication number
- CA1230833A CA1230833A CA000449164A CA449164A CA1230833A CA 1230833 A CA1230833 A CA 1230833A CA 000449164 A CA000449164 A CA 000449164A CA 449164 A CA449164 A CA 449164A CA 1230833 A CA1230833 A CA 1230833A
- Authority
- CA
- Canada
- Prior art keywords
- brake
- sidewise
- projecting portion
- arm
- coupling piece
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62L—BRAKES SPECIALLY ADAPTED FOR CYCLES
- B62L1/00—Brakes; Arrangements thereof
- B62L1/02—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements
- B62L1/06—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged
- B62L1/10—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged by the elements moving substantially parallel to the wheel axis
- B62L1/14—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged by the elements moving substantially parallel to the wheel axis the elements being mounted on levers pivotable about different axes
- B62L1/16—Brakes; Arrangements thereof in which cycle wheels are engaged by brake elements the wheel rim being engaged by the elements moving substantially parallel to the wheel axis the elements being mounted on levers pivotable about different axes the axes being located intermediate the ends of the levers
-
- 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
Abstract
ABSTRACT OF THE DISCLOSURE
A pair of brake arms having brake shoes at their lower ends are pivoted to opposite ends of a mounting bracket attachable to the frame of a bicycle. A coupling mechanism for pivotally moving the two brake arms in synchronism in operative relation to each other comprises a coupling piece projecting from one of the brake arms integrally therewith and a cam groove formed in the other brake arm and having the coupling piece slidably fitted therein. The connections between a Bowden cable and the brake arms are not projecting largely from the brake sidewise.
A pair of brake arms having brake shoes at their lower ends are pivoted to opposite ends of a mounting bracket attachable to the frame of a bicycle. A coupling mechanism for pivotally moving the two brake arms in synchronism in operative relation to each other comprises a coupling piece projecting from one of the brake arms integrally therewith and a cam groove formed in the other brake arm and having the coupling piece slidably fitted therein. The connections between a Bowden cable and the brake arms are not projecting largely from the brake sidewise.
Description
123~ 3 TITLE OF THE INVENTION
CALIPER BRAKE FOR BICYCLES
BACKGROUND OF THE INVENTION
Conventional caliper brakes for bicycles are divided into two types: the side-pull type and the center-pull type.
Unlike the center-pull caliper brake wherein brake arms of the same length are pulled at the center by a Bowmen cable, the side-pull caliper brake comprises large and small brake arms of different lengths which are pulled each at one side by a Bowmen cable. The construction of the side-pull type therefore inevitably involves the problem that the brake shoe on the large brake arm comes into contact with the rim more quickly than the brake shoe on the small brake arm to brake the wheel at one side.
To overcome this problem, the present applicant has arrowhead proposed a device for preventing one-side action of the side-pull caliper brake as disclosed in Published Examined Japanese utility Model Application SO 55-50064.
Although the proposed device comprises a coupling mechanism for pivotal moving the two brake arms in synchronism, the coupling mechanism is complex in construction and requires an increased number of parts, rendering the device costly to make and cumbersome and time-consuming to assemble.
~:3Q~3 Further with the side-pull caliper brake, the connection of the Bowmen cable with the brake arm largely projects from the brake sideways and is therefore liable to contact an obstacle, which in turn tends to displace the brake shoe although the clearances between the brake shoes and opposite side faces of the rim are made equal when the brake is installed. The brake will then act only on one side of the rim.
The side-pull caliper brake has another drawback in that when it is installed for the rear wheel, the inner side of the thigh of the rider is likely to interfere with the connection. This drawback becomes pronounced when the rider has a fat body.
Although the center-pull caliper brake is free of the problem of one-side action or the problem of displacement of the brake shoe stated above, the brake of the center-pull type has a different problem. With this brake, the two brake arms are connected together at their upper ends by a yoke cable, and a hanger engaged with the yoke cable is pulled by the Bowmen cable, so that the brake requires the use of the yoke cable and the hanger which are not included in the side-pull caliper brake in which the Bowmen cable is connected directly to the brake arms. These components make the brake correspondingly costly to manufacture and cumbersome and time-consuming to install.
`` 123~833 SUMMARY OF THE INVENTION
A first object of the present invention is to provide a simple mechanism for coupling two brake arms together to prevent one-side braking action without using an increased number of parts and to provide a caliper brake for bicycles which is composed of a smaller number of parts than the center-pull caliper brake and which can be manufactured at a reduced cost and installed easily within a short period of time.
A second object of the present invention is to provide a caliper brake for bicycles wherein the connection between the Bowmen wire and the brake arm assembly is unlikely to contact obstacles to assure that the brake shoes will be spaced from opposite side faces of the rim by the same clearance as initially installed so that the brake can be prevented from acting on one side only of the rim.
A third object of the present invention is to provide a caliper brake which, when installed for the rear wheel of a bicycle, is unlikely to permit the inner side of the thigh of the rider to interfere with the connection between the Bowmen wire and the brake arm assembly even if the rider has a fat body.
The above objects are met by the present invention which provides, a caliper brake for a bicycle including a pair of brake arms, having brake shoes at their lower ends and respectively supported by pivots on opposite ends of a mounting bracket attachable to the frame of the bicycle, I, - 3 -dale _ '1Z30833 the brake arms respectively having Saudis projecting portions each extending from its pivoted portion toward the other pivoted portion and opposed to each other longitudinally of the bicycle, a coupling mechanism for pivotal moving the two brake arms in synchronism in operative relation to each other, and a brake spring for biasing the lower ends of the brake arms away from each other, the brake being operable by a Bowmen cable composed of an outer wire and an inner wire, the brake being characterized in that the coupling mechanism comprises a projecting coupling piece integrally formed on one of the Saudis projecting portions and a cam groove formed in the other Saudis projecting portion in opposed relation to the coupling piece and having the coupling piece slid ably fitted therein, an auxiliary arm extending upward from the forward end of one of the Saudis projecting portions, and having a free end positioned, with respect to the Saudis direction, between opposite side ends of the brake arm having said one Saudis projecting portion, the free end supporting one end of the outer wire, the forward end of the other side-wise projecting portion having fixed thereto one end of the inner wire and being located, with respect to the Saudis direction, approximately in the same position as or inward from the outer end of the brake arm having said one Saudis projecting portion.
Other objects, features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings.
:' - pa -...
~230~ 3 BRIEF DESCRIPTION Ox THE DRAWINGS
Fig. 1 is an overall perspective view showing an embodiment of the invention;
Fig. 2 is a front view of the same;
Figs. 3 and 4 are overall front views showing the same during operation in states different from the illustrated state of Fig. l;
Fig. 5 is a view in section taken along the line A-A in Fig. 2;
Fig. 6 is a view showing the embodiment as it is seen in the direction of arrow B in Fig. 2; and Fig. 7 is an exploded perspective view showing the assembly illustrated in Fig. 6.
DETAILED DESCRIPTION OF THE INVENTION
The drawings show an embodiment of the present invention. With reference to Figs. 1 to 5, a caliper brake 1 for bicycles comprises a mounting bracket 2, a pair of first and second brake arms 3, 4, a pair of brake shoes 5, 6, a coupling mechanism 7, a brake spring 8, an auxiliary arm 9, a quick release assembly 10, etc. The brake 1 is operated by an unillustrated brake lever device through a Bowmen cable 13 comprising an outer wire 11 and an inner wire 12.
The mounting bracket 2 is arcuate and is fixed at .
~23~)833 its center portion to the fork 15 of the bicycle frame 14 by a bolt 16. The brake arms 3, 4 are spaced apart from the mounting bracket 2 by a pair of tubular portions 17, 18 projecting from opposite ends of the bracket 2.
The brake arms 3, 4 are rotatable supported by pivots 19, 20 on opposite ends of the mounting bracket 2.
Bolts are used as the pivots 19, 20 and inserted through the tubular portions 17, 18. The brake arms 3, 4 are each in an inverted L shape and include downward portions 23, 24 extending downward from portions 21, 22 supported by the pivots 19, 20 and portions 25, 26 each projecting Saudis from its pivoted portion toward the other pivoted portion.
The downward portions 23, 24 are opposed to each other laterally of the bicycle and provided at their lower ends with the brake shoes 5, 6 spaced by the same clearance from opposite side faces of the rim 28 of the front wheel 27 in opposed relation thereto. The Saudis projecting portions 25, 26 are opposed to each other longitudinally of the bicycle in the Saudis middle portion of the brake 1.
In this middle portion, the first brake arm 3 is disposed on the rear side of the second brake arm 4.
The coupling mechanism 7 for pivotal moving the two brake arms 3, 4 in synchronism in operative relation to each other comprises a coupling piece 29 and a cam groove 30. The coupling piece 29 is integral with and projected lo 333 forward from the forward end of the rear Saudis projecting portion 25. The coupling piece 29 is formed by welding a pin Jo the first brake arm 3 or is formed integrally with the first brake arm 3 by press work or the like. The front Saudis projecting portion 26 is formed at the Saudis mid portion of its rear side with the cam groove 30 which is arcuate, has a bottom and is open rearward.
The coupling piece 29 is slid ably fitted in the cam groove 30. Thus the coupling mechanism 7 is simple in construction, while the provision of the mechanism 7 does not require additional parts. The brake 1 can therefore be assembled and installed easily within a short period of time and can be manufactured at a low cost.
The brake spring 8 is adapted to bias the downward portions 23, 24 of the brake arms 3, 4 away from each other, is wound around the left tubular portion 17 and has one free end engaged with a pin 31 projecting from the left end front side of the mounting bracket 2. The other free end of the spring 8 is engaged with a pin 32 projecting rearward from the rear side of an upper part of the downward portion 23 of the first brake arm 3. The spring biases the downward portion 23 laterally outward, further biasing the downward portion 24 of the second brake arm 4 laterally outward through the coupling mechanism 7.
The auxiliary arm 9 extends from the forward end ~230833 of the Saudis projecting portion 25 of the first brake arm 3 upward above the portion 25 and has a free end which is positioned between opposite side ends of the first brake arm 3 with respect to the Saudis direction. As seen in Figs. 6 and 7, the free end of the auxiliary arm 9 has inserted there through a forwardly projecting mounting bolt 33, which is fixed to the end by a nut 34. The mount-in bolt 33 is provided with an adjusting bolt 36 having a lock nut 35. The end of the outer wire if is supported by lo the upper end of the bolt 36.
The quick release assembly 10 serves to space apart the two brake shoes 5, 6 by a larger distance than when the brake is in its inoperative state shown in Fig. 2.
The assembly lo comprises a tubular member 37 and cam member 38 and is mounted on the bolt 33. With respect to the Saudis or lateral direction, the assembly lo is positioned between opposite side ends of the first brake arm 3 and is not projecting from the brake l Saudis. This eliminates the likelihood that the assembly lo will be inadvertently operated by contact with an obstacle. The tubular member 37 has a flange 39 at its upper end and is axially movably inserted through the front portion of the mounting bolt 33 from above leftwardly downward. The adjusting bolt 36 is axially movably screwed into the tubular member 37 and fixed by the lock nut 35. The clearances between the opposed brake shoes 5, 6 and opposite side faces of the rim 28 are adjustable by advancing or retracting the adjusting bolt 36. The cam member 38 comprises a pair of front and rear cam portions I and a lever portion 41 ~Z3~333 interconnecting the cam portion 40 at their base ends. The cam portions 40 are rotatable fitted around the mounting bolt 33 on the front side and the rear side of the tubular member 37. Each of the cam portions 40 has at its outer periphery a first cam face 42 in contact with the flange 39 of the tubular member 37 and a second cam face 43 at a right angle with the first cam face 42. The distance between the first cam face 42 and the mounting bolt 33 is larger than the distance between the second cam face 43 and the bolt 33.
Usually the first cam faces 42 are in contact with the flange 39 as shown in Fig. 2 to hold the brake shoes 5, 6 spaced from the side faces of the rim 28 by the proper distance.
When the front wheel 27 is to be removed or installed, the cam member 38 is rotated to contact the second cam faces 43 with the flange 39 as shown in Fig. 4 to move the downward portions 23, 24 away from each other under the action of the brake spring 8 and increase the distance between the brake shoes 5, 6 and the rim 28. The front wheel 27 positioned between the two brake arms 3, 4 is then easy to handle.
The inner wire 12 is inserted through the adjusting bolt 36 and the tubular member 37, and the inserted end is fixed to the forward end of the Saudis projecting portion 26 of the second brake arm 4 by a bolt 44 and a nut 45. With respect to the Saudis direction, the forward end of the projecting portion 26 is approximately in the same position as the outer end of the first brake arm 3.
lZ3~33 Since the Bowmen wire 13 is connected directly to the brake arms 3, 4 as stated above, the yoke wire and the hanger needed for the center-pull caliper brake can be dispensed with. The present brake can therefore be assembled and installed more easily within a shorter period of time and is less costly.
With the embodiment described above, the unillustrated brake lever device is operated to pull the inner wire 12 and actuate the brake 1, whereby the brake arms 3, 4 and the auxiliary arm 9 are rotated about the pivots 19, 20, bringing the opposed brake shoes 5, 6 into pressing contact with the side faces of the rim 28 to brake the front wheel 27.
At this time, the coupling piece 29 of the coupling mechanism 7 slidingly moves relative to the cam groove 30, thereby permitting the brake arms 3, 4 to move in synchronism in operative relation to each other and bring the opposed brake shoes 5, 6 into contact with the rim 28 at the same time. Thus the front wheel 27 can be braked properly without the likelihood that one of the brake shoes 5, 6 will contact the rim 28 earlier than the other for the brake 1 to act on one side of the rim.
When the brake lever device is relieved of the operating force, the brake spring 8 and the coupling mechanism act to move the brake arms 3, 4 reversely to the original position in synchronism.
The free end of the auxiliary arm 9 supporting one end of the outer wire is positioned between opposite side ends of the first brake arm 3 with respect to the Saudis lZ3(~3 direction, while the forward end of the Saudis projecting portion 26 to which one end of the inner wire 12 is fixed is approximately in the same position as the outer end portion of the first brake arm 3 with respect to the Saudis direct lion, without allowing the connections between the sodden wire 13 and the brake arms 3, 4 to project largely Saudis.
The connections are therefore unlikely to contact obstacles, with the result that the brake shoes 5, 6 can be held spaced from opposite side faces of the rim 28 by the same clearance lo as initially installed. This reduces the likelihood that the brake will act on one side only of the rim owing to different clearances.
Although the coupling piece 29 is provided on the rear Saudis projecting portion 25, with the cam groove 30 formed in the front Saudis projecting portion 26, these portions may be provided in reverse relation to the above.
The cam groove 30 may be in the form of a hole, while another brake spring may be provided on the right tubular portion 18.
The forward end of the Saudis projecting portion 26 to which one end of the inner wire 12 is fixed may be positioned inward from the outer end of the first brake arm 3 having the other projecting portion 25. Furthermore, the auxiliary arm 9 may be provided on the second brace arm 4, with the inner wire 12 fixed to the forward end of the Saudis projecting portion 25 of the first brake arm 3.
The brake l, which is provided for the front wheel 27 of the bicycle, may be installed for the -ear wheel.
Z~333 Since the connections between the Bowmen cable 13 and the brake arm assembly are not projecting from the brake 1 largely Saudis, the inner side of the thigh of the rider is then unlikely to interfere with the connections even if the rider has a fat body.
s s/., "1
CALIPER BRAKE FOR BICYCLES
BACKGROUND OF THE INVENTION
Conventional caliper brakes for bicycles are divided into two types: the side-pull type and the center-pull type.
Unlike the center-pull caliper brake wherein brake arms of the same length are pulled at the center by a Bowmen cable, the side-pull caliper brake comprises large and small brake arms of different lengths which are pulled each at one side by a Bowmen cable. The construction of the side-pull type therefore inevitably involves the problem that the brake shoe on the large brake arm comes into contact with the rim more quickly than the brake shoe on the small brake arm to brake the wheel at one side.
To overcome this problem, the present applicant has arrowhead proposed a device for preventing one-side action of the side-pull caliper brake as disclosed in Published Examined Japanese utility Model Application SO 55-50064.
Although the proposed device comprises a coupling mechanism for pivotal moving the two brake arms in synchronism, the coupling mechanism is complex in construction and requires an increased number of parts, rendering the device costly to make and cumbersome and time-consuming to assemble.
~:3Q~3 Further with the side-pull caliper brake, the connection of the Bowmen cable with the brake arm largely projects from the brake sideways and is therefore liable to contact an obstacle, which in turn tends to displace the brake shoe although the clearances between the brake shoes and opposite side faces of the rim are made equal when the brake is installed. The brake will then act only on one side of the rim.
The side-pull caliper brake has another drawback in that when it is installed for the rear wheel, the inner side of the thigh of the rider is likely to interfere with the connection. This drawback becomes pronounced when the rider has a fat body.
Although the center-pull caliper brake is free of the problem of one-side action or the problem of displacement of the brake shoe stated above, the brake of the center-pull type has a different problem. With this brake, the two brake arms are connected together at their upper ends by a yoke cable, and a hanger engaged with the yoke cable is pulled by the Bowmen cable, so that the brake requires the use of the yoke cable and the hanger which are not included in the side-pull caliper brake in which the Bowmen cable is connected directly to the brake arms. These components make the brake correspondingly costly to manufacture and cumbersome and time-consuming to install.
`` 123~833 SUMMARY OF THE INVENTION
A first object of the present invention is to provide a simple mechanism for coupling two brake arms together to prevent one-side braking action without using an increased number of parts and to provide a caliper brake for bicycles which is composed of a smaller number of parts than the center-pull caliper brake and which can be manufactured at a reduced cost and installed easily within a short period of time.
A second object of the present invention is to provide a caliper brake for bicycles wherein the connection between the Bowmen wire and the brake arm assembly is unlikely to contact obstacles to assure that the brake shoes will be spaced from opposite side faces of the rim by the same clearance as initially installed so that the brake can be prevented from acting on one side only of the rim.
A third object of the present invention is to provide a caliper brake which, when installed for the rear wheel of a bicycle, is unlikely to permit the inner side of the thigh of the rider to interfere with the connection between the Bowmen wire and the brake arm assembly even if the rider has a fat body.
The above objects are met by the present invention which provides, a caliper brake for a bicycle including a pair of brake arms, having brake shoes at their lower ends and respectively supported by pivots on opposite ends of a mounting bracket attachable to the frame of the bicycle, I, - 3 -dale _ '1Z30833 the brake arms respectively having Saudis projecting portions each extending from its pivoted portion toward the other pivoted portion and opposed to each other longitudinally of the bicycle, a coupling mechanism for pivotal moving the two brake arms in synchronism in operative relation to each other, and a brake spring for biasing the lower ends of the brake arms away from each other, the brake being operable by a Bowmen cable composed of an outer wire and an inner wire, the brake being characterized in that the coupling mechanism comprises a projecting coupling piece integrally formed on one of the Saudis projecting portions and a cam groove formed in the other Saudis projecting portion in opposed relation to the coupling piece and having the coupling piece slid ably fitted therein, an auxiliary arm extending upward from the forward end of one of the Saudis projecting portions, and having a free end positioned, with respect to the Saudis direction, between opposite side ends of the brake arm having said one Saudis projecting portion, the free end supporting one end of the outer wire, the forward end of the other side-wise projecting portion having fixed thereto one end of the inner wire and being located, with respect to the Saudis direction, approximately in the same position as or inward from the outer end of the brake arm having said one Saudis projecting portion.
Other objects, features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings.
:' - pa -...
~230~ 3 BRIEF DESCRIPTION Ox THE DRAWINGS
Fig. 1 is an overall perspective view showing an embodiment of the invention;
Fig. 2 is a front view of the same;
Figs. 3 and 4 are overall front views showing the same during operation in states different from the illustrated state of Fig. l;
Fig. 5 is a view in section taken along the line A-A in Fig. 2;
Fig. 6 is a view showing the embodiment as it is seen in the direction of arrow B in Fig. 2; and Fig. 7 is an exploded perspective view showing the assembly illustrated in Fig. 6.
DETAILED DESCRIPTION OF THE INVENTION
The drawings show an embodiment of the present invention. With reference to Figs. 1 to 5, a caliper brake 1 for bicycles comprises a mounting bracket 2, a pair of first and second brake arms 3, 4, a pair of brake shoes 5, 6, a coupling mechanism 7, a brake spring 8, an auxiliary arm 9, a quick release assembly 10, etc. The brake 1 is operated by an unillustrated brake lever device through a Bowmen cable 13 comprising an outer wire 11 and an inner wire 12.
The mounting bracket 2 is arcuate and is fixed at .
~23~)833 its center portion to the fork 15 of the bicycle frame 14 by a bolt 16. The brake arms 3, 4 are spaced apart from the mounting bracket 2 by a pair of tubular portions 17, 18 projecting from opposite ends of the bracket 2.
The brake arms 3, 4 are rotatable supported by pivots 19, 20 on opposite ends of the mounting bracket 2.
Bolts are used as the pivots 19, 20 and inserted through the tubular portions 17, 18. The brake arms 3, 4 are each in an inverted L shape and include downward portions 23, 24 extending downward from portions 21, 22 supported by the pivots 19, 20 and portions 25, 26 each projecting Saudis from its pivoted portion toward the other pivoted portion.
The downward portions 23, 24 are opposed to each other laterally of the bicycle and provided at their lower ends with the brake shoes 5, 6 spaced by the same clearance from opposite side faces of the rim 28 of the front wheel 27 in opposed relation thereto. The Saudis projecting portions 25, 26 are opposed to each other longitudinally of the bicycle in the Saudis middle portion of the brake 1.
In this middle portion, the first brake arm 3 is disposed on the rear side of the second brake arm 4.
The coupling mechanism 7 for pivotal moving the two brake arms 3, 4 in synchronism in operative relation to each other comprises a coupling piece 29 and a cam groove 30. The coupling piece 29 is integral with and projected lo 333 forward from the forward end of the rear Saudis projecting portion 25. The coupling piece 29 is formed by welding a pin Jo the first brake arm 3 or is formed integrally with the first brake arm 3 by press work or the like. The front Saudis projecting portion 26 is formed at the Saudis mid portion of its rear side with the cam groove 30 which is arcuate, has a bottom and is open rearward.
The coupling piece 29 is slid ably fitted in the cam groove 30. Thus the coupling mechanism 7 is simple in construction, while the provision of the mechanism 7 does not require additional parts. The brake 1 can therefore be assembled and installed easily within a short period of time and can be manufactured at a low cost.
The brake spring 8 is adapted to bias the downward portions 23, 24 of the brake arms 3, 4 away from each other, is wound around the left tubular portion 17 and has one free end engaged with a pin 31 projecting from the left end front side of the mounting bracket 2. The other free end of the spring 8 is engaged with a pin 32 projecting rearward from the rear side of an upper part of the downward portion 23 of the first brake arm 3. The spring biases the downward portion 23 laterally outward, further biasing the downward portion 24 of the second brake arm 4 laterally outward through the coupling mechanism 7.
The auxiliary arm 9 extends from the forward end ~230833 of the Saudis projecting portion 25 of the first brake arm 3 upward above the portion 25 and has a free end which is positioned between opposite side ends of the first brake arm 3 with respect to the Saudis direction. As seen in Figs. 6 and 7, the free end of the auxiliary arm 9 has inserted there through a forwardly projecting mounting bolt 33, which is fixed to the end by a nut 34. The mount-in bolt 33 is provided with an adjusting bolt 36 having a lock nut 35. The end of the outer wire if is supported by lo the upper end of the bolt 36.
The quick release assembly 10 serves to space apart the two brake shoes 5, 6 by a larger distance than when the brake is in its inoperative state shown in Fig. 2.
The assembly lo comprises a tubular member 37 and cam member 38 and is mounted on the bolt 33. With respect to the Saudis or lateral direction, the assembly lo is positioned between opposite side ends of the first brake arm 3 and is not projecting from the brake l Saudis. This eliminates the likelihood that the assembly lo will be inadvertently operated by contact with an obstacle. The tubular member 37 has a flange 39 at its upper end and is axially movably inserted through the front portion of the mounting bolt 33 from above leftwardly downward. The adjusting bolt 36 is axially movably screwed into the tubular member 37 and fixed by the lock nut 35. The clearances between the opposed brake shoes 5, 6 and opposite side faces of the rim 28 are adjustable by advancing or retracting the adjusting bolt 36. The cam member 38 comprises a pair of front and rear cam portions I and a lever portion 41 ~Z3~333 interconnecting the cam portion 40 at their base ends. The cam portions 40 are rotatable fitted around the mounting bolt 33 on the front side and the rear side of the tubular member 37. Each of the cam portions 40 has at its outer periphery a first cam face 42 in contact with the flange 39 of the tubular member 37 and a second cam face 43 at a right angle with the first cam face 42. The distance between the first cam face 42 and the mounting bolt 33 is larger than the distance between the second cam face 43 and the bolt 33.
Usually the first cam faces 42 are in contact with the flange 39 as shown in Fig. 2 to hold the brake shoes 5, 6 spaced from the side faces of the rim 28 by the proper distance.
When the front wheel 27 is to be removed or installed, the cam member 38 is rotated to contact the second cam faces 43 with the flange 39 as shown in Fig. 4 to move the downward portions 23, 24 away from each other under the action of the brake spring 8 and increase the distance between the brake shoes 5, 6 and the rim 28. The front wheel 27 positioned between the two brake arms 3, 4 is then easy to handle.
The inner wire 12 is inserted through the adjusting bolt 36 and the tubular member 37, and the inserted end is fixed to the forward end of the Saudis projecting portion 26 of the second brake arm 4 by a bolt 44 and a nut 45. With respect to the Saudis direction, the forward end of the projecting portion 26 is approximately in the same position as the outer end of the first brake arm 3.
lZ3~33 Since the Bowmen wire 13 is connected directly to the brake arms 3, 4 as stated above, the yoke wire and the hanger needed for the center-pull caliper brake can be dispensed with. The present brake can therefore be assembled and installed more easily within a shorter period of time and is less costly.
With the embodiment described above, the unillustrated brake lever device is operated to pull the inner wire 12 and actuate the brake 1, whereby the brake arms 3, 4 and the auxiliary arm 9 are rotated about the pivots 19, 20, bringing the opposed brake shoes 5, 6 into pressing contact with the side faces of the rim 28 to brake the front wheel 27.
At this time, the coupling piece 29 of the coupling mechanism 7 slidingly moves relative to the cam groove 30, thereby permitting the brake arms 3, 4 to move in synchronism in operative relation to each other and bring the opposed brake shoes 5, 6 into contact with the rim 28 at the same time. Thus the front wheel 27 can be braked properly without the likelihood that one of the brake shoes 5, 6 will contact the rim 28 earlier than the other for the brake 1 to act on one side of the rim.
When the brake lever device is relieved of the operating force, the brake spring 8 and the coupling mechanism act to move the brake arms 3, 4 reversely to the original position in synchronism.
The free end of the auxiliary arm 9 supporting one end of the outer wire is positioned between opposite side ends of the first brake arm 3 with respect to the Saudis lZ3(~3 direction, while the forward end of the Saudis projecting portion 26 to which one end of the inner wire 12 is fixed is approximately in the same position as the outer end portion of the first brake arm 3 with respect to the Saudis direct lion, without allowing the connections between the sodden wire 13 and the brake arms 3, 4 to project largely Saudis.
The connections are therefore unlikely to contact obstacles, with the result that the brake shoes 5, 6 can be held spaced from opposite side faces of the rim 28 by the same clearance lo as initially installed. This reduces the likelihood that the brake will act on one side only of the rim owing to different clearances.
Although the coupling piece 29 is provided on the rear Saudis projecting portion 25, with the cam groove 30 formed in the front Saudis projecting portion 26, these portions may be provided in reverse relation to the above.
The cam groove 30 may be in the form of a hole, while another brake spring may be provided on the right tubular portion 18.
The forward end of the Saudis projecting portion 26 to which one end of the inner wire 12 is fixed may be positioned inward from the outer end of the first brake arm 3 having the other projecting portion 25. Furthermore, the auxiliary arm 9 may be provided on the second brace arm 4, with the inner wire 12 fixed to the forward end of the Saudis projecting portion 25 of the first brake arm 3.
The brake l, which is provided for the front wheel 27 of the bicycle, may be installed for the -ear wheel.
Z~333 Since the connections between the Bowmen cable 13 and the brake arm assembly are not projecting from the brake 1 largely Saudis, the inner side of the thigh of the rider is then unlikely to interfere with the connections even if the rider has a fat body.
s s/., "1
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A caliper brake for a bicycle including a pair of brake arms, having brake shoes at their lower ends and respectively supported by pivots on opposite ends of a mounting bracket attachable to the frame of the bicycle, the brake arms respectively having sidewise projecting portions each extending from its pivoted portion toward the other pivoted portion and opposed to each other longitudinally of the bicycle, a coupling mechanism for pivotally moving the two brake arms in synchronism in operative relation to each other, and a brake spring for biasing the lower ends of the brake arms away from each other, the brake being operable by a Bowden cable composed of an outer wire and an inner wire, the brake being characterized in that the coupling mechanism comprises a projecting coupling piece integrally formed on one of the sidewise projecting portions and a cam groove formed in the other sidewise projecting portion in opposed relation to the coupling piece and having the coupling piece slidably fitted therein, an auxiliary arm extending upward from the forward end of one of the sidewise projecting portions, and having a free end positioned, with respect to the sidewise direction, between opposite side ends of the brake arm having said one sidewise projecting portion, the free end supporting one end of the outer wire, the forward end of the other sidewise projecting portion having fixed thereto one end of the inner wire and being located, with respect to the sidewise direction, approximately in the same position as or inward from the outer end of the brake arm having said one sidewise projecting portion.
2. A caliper brake as defined in claim 1 wherein the coupling piece is formed on the rear sidewise projecting portion, and the cam groove is formed in the front sidewise projecting portion.
3. A caliper brake as defined in claim 1 wherein the sidewise projecting portion having the coupling piece is provided with the auxiliary arm, and the inner wire is fixed to the sidewise projecting portion having the cam groove.
4. A caliper brake as defined in claim 1 wherein the free end of the auxiliary arm is provided with a quick release assembly supporting the end of the outer wire for spacing apart the two brake shoes by a larger distance than when the brake is in its inoperative state, and the assembly is positioned, with respect to the sidewise direction, between opposite side ends of the brake arm having the auxiliary arm.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58-130725 | 1983-08-23 | ||
| JP1983130725U JPS6037491U (en) | 1983-08-23 | 1983-08-23 | bicycle caliper brake |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1230833A true CA1230833A (en) | 1987-12-29 |
Family
ID=15041133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000449164A Expired CA1230833A (en) | 1983-08-23 | 1984-03-08 | Caliper brake for bicycle |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS6037491U (en) |
| KR (2) | KR850002420A (en) |
| CA (1) | CA1230833A (en) |
| DE (1) | DE3409779A1 (en) |
| FR (1) | FR2551017B1 (en) |
| GB (1) | GB2145484B (en) |
| IT (1) | IT1179158B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3614677A1 (en) * | 1986-04-30 | 1987-11-05 | Union Sils Van De Loo & Co | RIM BRAKE FOR A BICYCLE |
| JPS63192684A (en) * | 1987-02-02 | 1988-08-10 | 佐藤 政太郎 | Caliper brake |
| TW451868U (en) * | 2000-01-31 | 2001-08-21 | Proking Sports Corp | Improved device for adjustment seat of front wheel brake |
| DE20313347U1 (en) * | 2003-08-27 | 2005-01-05 | Canyon Bicycles Gmbh | calipers |
| ES2383189T3 (en) | 2008-08-27 | 2012-06-19 | Chang Hui Lin | Bicycle brake device |
| TW201231345A (en) * | 2011-01-17 | 2012-08-01 | zhen-hua Huang | Balancing device for bicycle brake clamper |
| US8997943B2 (en) | 2011-03-04 | 2015-04-07 | Shimano, Inc. | Bicycle brake with synchronized brake arms |
| EP2495159B1 (en) * | 2011-03-04 | 2015-11-04 | Shimano Inc. | Bicycle brake assembly |
| EP2495160B1 (en) * | 2011-03-04 | 2018-05-09 | Shimano Inc. | Bicycle brake assembly |
| JP2012214117A (en) * | 2011-03-31 | 2012-11-08 | Shimano Inc | Quick release mechanism for bicycle brake |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR439083A (en) * | 1912-01-16 | 1912-06-05 | Arlanges Emile D | Rim brake for all types of cycles |
| FR22679E (en) * | 1920-01-05 | 1921-08-04 | Auguste Dandrieux | Progressive brake for cycles and motorcycles |
| DE1245780B (en) * | 1961-02-08 | 1967-07-27 | Karl Altenburger | Rim brake, especially for two-wheeled vehicles |
| CH385049A (en) * | 1961-02-08 | 1965-02-26 | Altenburger Karl | Rim brakes for vehicles |
| FR1495868A (en) * | 1966-10-04 | 1967-09-22 | Weinmann Ag | Central control rim brake |
| US3809187A (en) * | 1972-10-20 | 1974-05-07 | R Grieve | Brake assembly for vehicle wheel |
| US4027746A (en) * | 1975-09-05 | 1977-06-07 | Shimano Industrial Company, Limited | Center-pull type caliper brake for a bicycle |
| JPS5315097Y2 (en) * | 1975-09-05 | 1978-04-21 | ||
| DE2903191A1 (en) * | 1977-10-05 | 1980-07-31 | Mafac S A Ets | Central pull type bicycle brake - has cable control to caliper-type mechanism via Y-piece springs open to admit wheel self balancing |
| JPS559732A (en) * | 1978-07-05 | 1980-01-23 | Saito Shigenori | Waste straw conveying device in combined harvester |
| JPS5830137Y2 (en) * | 1979-08-04 | 1983-07-02 | 株式会社荏原製作所 | Pump suction tank vortex prevention device |
| JPS625437Y2 (en) * | 1981-02-26 | 1987-02-06 |
-
1983
- 1983-08-23 JP JP1983130725U patent/JPS6037491U/en active Granted
-
1984
- 1984-02-22 GB GB08404623A patent/GB2145484B/en not_active Expired
- 1984-03-05 KR KR1019840001104A patent/KR850002420A/en not_active Application Discontinuation
- 1984-03-08 CA CA000449164A patent/CA1230833A/en not_active Expired
- 1984-03-08 IT IT8447819A patent/IT1179158B/en active
- 1984-03-16 DE DE19843409779 patent/DE3409779A1/en active Granted
- 1984-05-22 FR FR8407937A patent/FR2551017B1/en not_active Expired
-
1987
- 1987-08-24 KR KR2019870014116U patent/KR870003905Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE3409779C2 (en) | 1988-12-29 |
| DE3409779A1 (en) | 1985-03-14 |
| GB2145484B (en) | 1986-09-24 |
| KR870003905Y1 (en) | 1987-12-05 |
| IT8447819A0 (en) | 1984-03-08 |
| IT1179158B (en) | 1987-09-16 |
| FR2551017B1 (en) | 1987-02-13 |
| GB2145484A (en) | 1985-03-27 |
| JPS633593Y2 (en) | 1988-01-28 |
| FR2551017A1 (en) | 1985-03-01 |
| JPS6037491U (en) | 1985-03-15 |
| GB8404623D0 (en) | 1984-03-28 |
| KR850002420A (en) | 1985-05-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |