CA2113533A1 - Steering bearing assembly for a bicycle - Google Patents

Steering bearing assembly for a bicycle

Info

Publication number
CA2113533A1
CA2113533A1 CA002113533A CA2113533A CA2113533A1 CA 2113533 A1 CA2113533 A1 CA 2113533A1 CA 002113533 A CA002113533 A CA 002113533A CA 2113533 A CA2113533 A CA 2113533A CA 2113533 A1 CA2113533 A1 CA 2113533A1
Authority
CA
Canada
Prior art keywords
steerer tube
tube
bearing assembly
steerer
head
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
Application number
CA002113533A
Other languages
French (fr)
Inventor
Douglas Chiang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA002113533A priority Critical patent/CA2113533A1/en
Publication of CA2113533A1 publication Critical patent/CA2113533A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62KCYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
    • B62K21/00Steering devices
    • B62K21/06Bearings specially adapted for steering heads

Abstract

A steering bearing assembly includes a head tube, a steerer tube that has a first end which is connected to a front fork of a bicycle and which extends through the head tube, and a bearing assembly disposed between the head tube and the steerer tube. A truncated cone-shaped inserter is disposed in a second end of the steerer tube and has an axially extending threaded bore formed therethrough. A C-shaped resilient member with an inner tapered wall is press-fitted into the steerer tube above the inserter. A threaded bolt is disposed on the second end of the steerer tube and is threaded into the inserter. When the threaded bolt is tightened, the resilient member expands radially to abut frictionally against the steerer tube and to compress downward simultaneously a tubular connector that is disposed on the head tube around the steerer tube.

Description

--1-- 2113~33 STEERING BEARING ASSEMBLY FOR A BICYCLE
BACKGROUND OF THE lNV~NlION
1. FIELD OF THE INVENTION
The invention relates to a bicycle frame, more particularly to a steering bearing assembly for connecting a front wheel and handle bars to the bicycle frame.
2. DESCRIPTION OF THE RELATED ART
A conventional steering bearing assembly is used to connect a front fork wheel and handle bars to a bicycle frame. The conventional steering bearing assembly includes a head tube which is preferably welded to top and down tubes of the bicycle frame, and a steerer tube, one end of which is connected to a fork that carries a front wheel and while the other end passes through the head tube. After a tubular connector of a stem is provided around the steerer tube so as to dispose the same on the head tube, an adjuster nut is placed on an upper end of the steerer tube to fasten the connnector, the steerer tube and the head tube together.
The above-mentioned steering bearing assembly is advantageous, however, has a drawback. The internal thread at the upper end of the steerer tube can wear out due to constant vibration of the bicycle when in operation or due to a long period of use. When replacing the steerer tube, the user has to disassemble _ --2-- 2113 ~ 3 3 all the connecting parts, such as the stem, the head tube or the like, thus inconveniencing the user.
SUMMARY OF THE INVENTION
A main objective of the present invention is to provide a steering bearing assembly for a bicycle frame which is easy to disassemble, thereby facilitating replacement of a fastening member to fasten a steerer tube and handle bars of the bicycle frame.
According to the present invention, the steering bearing assembly includes a head tube connected securely with a top tube and a down tube of a bicycle frame, a steerer tube connected to a front wheel fork and passing through the head tube, and a bearing assembly provided at an upper end of the head tube.
The bearing assembly includes a lower race connected to the head tube, an upper race connected to the steerer tube, and a plurality of ball bearings enclosed between the upper and lower races to permit relative rotation of the two races. The upper race has an inner diameter that is greater than an external diameter of the steerer tube so that a clearance is formed between the upper race and the steerer tube. A compression ring is disposed in the clearance confined by the upper race and the steerer tube. A mounting stem is disposed above the compression ring and around the steerer tube.
The mounting stem is used for connecting the handle bars of the bicycle frame to the steerer tube.

--3~~ 2113~33 A C-shaped resilient member is disposed inside the steerer tube and is formed with an internal tapered wall. A truncated cone-shaped inserter is inserted into the tapered wall of the C-shaped resilient member and is in contact with the tapered wall of the latter.
The inserter has an axially extending threaded bore formed therethrough. A threaded bolt with a head is disposed at an upper end of the steerer tube and connects threadedly with the inserter in the threaded bore of the latter. When the threaded bolt is tightened, the inserter is squeezed into the resilient member such that the latter expands radially to abut frictionally against the steerer tube. The stem is simultaneously forced downward by the head of the threaded bolt so as to compress the compression ring against the second race and the steerer tube in order so as to retain the steerer tube vertically relative to the bearing assembly.
In the event that the screw thread in the threaded bore of the inserter wears out, the inserter can be replaced easily by removing the threaded bolt from the steerer tube. There is no need to remove the stem, the head tube and the bearing assembly from the steerer tube as required in the prior art.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features and advantages of the present invention will become more apparent in the following --4~~ 21 i 3 ~ 3 3 detailed description of the preferred embodiment with reference to the accompanying drawings, in which:
Figure 1 shows a steering bearing assembly of U. S.
Pat. No. 5,095,770 which is used to connect handle bars and a front fork wheel of a bicycle frame;
Figure 2 is an exploded view of the steering bearing assembly shown in Figure 1;
Figure 3 is a partially cross sectional view of the steering bearing assembly shown in Figure 1;
Figure 4 is a cross sectional view of the steering bearing assembly shown in Figure 1;
Figure 5 is an exploded view of a steering bearing assembly of the present invention which is to be used to connect a front fork wheel and handle bars to a bicycle frame; and Figure 6 is a cross sectional view of the steering bearing assembly of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Figures 1 to 4, illustrate a steering bearing assembly of a bicycle frame according to U. S. Pat. N0.
5, 095, 770 which is used to connect a front wheel and handle bars to the bicycle frame. The steering bearing assembly includes a steerer tube 33, one end of which is connected to a fork assembly 31 that carries the front wheel, a head tube 21 that is connected fixedly to a top tube 19 and a down tube 23 of the bicycle, and a stem 37 that carries the hand bars 15.

--5-- 21135~3 The steerer tube 33 extends through the head tube 21 and through a tubular connector 35 of the stem 37.
In order for the steerer tube 33 to rotate relative to the head tube 21, a lower bearing assembly 47 and an upper bearing assembly 49 are mounted between the steerer tube 33 and the head tube 21. The upper bearing assembly 49 is located at an upper end of the head tube 33 and includes a first race 57 and a second race 59 which encase cooperatively a plurality of ball bearings 61. The first and second races 57, 59 are supported to rotate relative to each other by the ball bearings 61. The first race 57 is fixedly connected with the head tube 2lso that it rotates with the same.
The second race 59 has an inner diameter that is greater than an outer diameter of the steerer tube 33 so that the steerer tube 33is carried by the upper bearing assembly 49 with a clearance formed between the second race 59 and the steerer tube 33. The second race 59 has an annular contact face 63 which tapers at an angle with respect to a longitudinal axis 65 of the steerer tube 33.
An annular compression ring 67 with a gap 69 is disposed above the second race 59 of the bearing assembly 49. The compression ring 67 has an upper surface 71 and a tapered contact surface 75 which matches the contact face 63 of the second race 59 in the bearing assembly 49.

When all of the elements are in place, an adjuster nut 79 is threaded to an internally threaded upper end 77 of the steerer tube 33. At this stage, a head 83 of the adjuster nut 79 contacts an upper end of the tubular connector 35 and forces the latter downward on the steerer tube 33. Longitudinal and radial forces are exerted consequently on the compression ring 67 such that the latter is compressed against the steerer tube 33 and the second race of the bearing assembly 49, thereby locking the compression ring 67 in place on the steerer tube 33.
Since the construction of a steering bearing assembly of the present invention is generally similar to the steering bearing assembly of U. S. Pat.
5,095,770, only the characterizing parts and components which relate to the present invention will be described in the following paragraphs.
Referring to Figures 5 and 6, the steering bearing assembly of the present invention is characterized by the compression member 60 and the fastening member.
The compression member 60 is a circular ring with a gap 62 and is easier to fabricate compared to the conventional compression ring of the U. S. Patent because it does not require a tapered contact surface.
The fastening member includes a threaded bolt 90, a C-shaped resilient member 81 and a truncated cone-shaped inserter 82. The threaded bolt 90 has an annular head ~~7~~ ~113~33 91, a contact face 92 and a threaded shank 100 which extends detachably from the annular head 91. The C-shaped resilient member 81 has a knurled external surface 811 and an inner tapered wall 813. The truncated cone-shaped inserter 82 has an axially extending threaded bore 822 formed therethrough. The steerer tube 20 is secured relative to the head tube 10 for relative rotational movement. It will be appreciated that the head tube 10 is typically welded to the bicycle frame members 24 and 25. There is provided a lower bearing assembly 29 and an upper bearing assembly 50 between the steerer tube 20 and the head tube 10. The lower bearing assembly 29 has a first race 30 and a second race 34. The first race 30 may be press fit into the lower end of the head tube 10, so that the first race 30 pivots with the head tube 10. The second race 34 of the lower bearing assembly 29 may be press fit into the steerer tube 20, so that the second race 34 pivots with the steerer tube 20. A
plurality of ball bearing 30' is enclosed between the first and second races 30 and 34, respectively.
Accordingly, the first and second races 30 and 34' are supported to rotate relative to each other by ball bearings 30'.
The upper bearing assembly 50 has an upper race 52 and a lower race 32 encasing a plurality of ball bearings 52' which enable the races 52 and 32 to rotate _ --8-- 2113~33 relative to each other. The upper race 52 is of larger inner diameter than the outer diameter of the steerer tube 20. A compression member 60 and a fastening member are employed to connect the upper race 52 to the steerer tube 20. The lower race 32 is connected to the head tube 10 by a press fit, for example.
An upper end of a steerer tube 20 which is employed in the preferred embodiment is not threaded.
Therefore, a manufacturing step is reduced in the process for manufacturing the steerer tube 20. In assembly, the compression member 60 is disposed between a clearance 11 which is cooperatively defined by an upper race 52 of the bearing assembly 50 and the steerer tube 20. The inserter 82 is placed in the steerer tube 20, and the C-shaped resilient member 81 is press-fitted into the steerer tube 20 above the inserter 82. The threaded bolt 90 is disposed at a topmost end of the steerer tube 20 such that the threaded shank 100 extends into the steerer tube 20 to connect threadedly with the inserter in the threaded bore 822 of the latter.
When the threaded shank 100 is tightened, the inserter 82 is squeezed into the C-shaped resilient member 81 and radially forces the tapered wall 813 of the C-shaped resilient member 81 such that the latter expands to abut frictionally against the steerer tube 20. A tubular connector 70 of the stem 78 which is -- --9-- 2113~33 disposed above the compression member 60 and is compressed downward by the head 91 of the threaded bolt 90, thereby forcing the compression member 60 to abut the steerer tube 20 and the upper race 52 of the bearing assembly 50 so as to retain the steerer tube 20 rotatably and vertically relative to the head tube 10.
When the threads on the shank 100 and inside the inserter 82 wear out in time, the inserter 82 and the shank 100 can be easily replaced by removing the threaded bolt 90 from the steerer tube 20. There is no need to disassemble the tubular connector 70 and the head tube 10 from the steerer tube 20. The objective and feature of the present invention is accordingly achieved.
While a preferred embodiment has been explained and described, it will be apparent that many changes and modifications can be made in the general construction and arrangement of the present invention without departing from the scope and spirit thereof.
Therefore, it is desired that the present invention be not limited to the exact disclosure but only to the extent of the appended claims.

Claims (2)

1. A steering bearing assembly for a bicycle frame, characterized by:
a head tube connected to the bicycle frame;
a steerer tube connected to a front wheel fork of the bicycle frame and passing through said head tube;
a bearing assembly including a lower race connected to said head tube, an upper race connected to said steerer tube, and a plurality of ball bearings enclosed between said lower and upper races to permit relative rotation therebetween, the upper race having an inner diameter that is greater than an external diameter of said steerer tube, thereby forming a clearance between the upper race of said bearing assembly and said steerer tube;
a compression member disposed in the clearance of the bearing assembly;
a mounting stem for connecting a handle bar of the bicycle frame to said steerer tube, said mounting stem having a tubular connector being disposed on said compression member and around said steerer tube;
a C-shaped resilient member being press-fitted into said steerer tube and having an inner tapered wall;
a truncated cone-shaped inserter inserted into said C-shaped resilient member, said inserter having an axially extending threaded bore; and a threaded bolt with a head provided on the steerer tube above said tubular connector and connected threadedly to said truncated cone-shaped inserter in the threaded bore, radially expanding said C-shaped resilient member when said threaded bolt is tightened so as to abut against the steerer tube and simultaneously force said tubular connector to compress said compression member against the upper race of the bearing assembly and said steerer tube, thereby retaining the compression member between said bearing assembly and the steerer tube to support the steerer tube vertically.
2. The steering bearing assembly as defined in Claim 1, wherein the C-shaped resilient member has a knurled external surface to increase friction between said steerer tube and said resilient member.
CA002113533A 1994-01-14 1994-01-14 Steering bearing assembly for a bicycle Abandoned CA2113533A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002113533A CA2113533A1 (en) 1994-01-14 1994-01-14 Steering bearing assembly for a bicycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA002113533A CA2113533A1 (en) 1994-01-14 1994-01-14 Steering bearing assembly for a bicycle

Publications (1)

Publication Number Publication Date
CA2113533A1 true CA2113533A1 (en) 1995-07-15

Family

ID=4152747

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002113533A Abandoned CA2113533A1 (en) 1994-01-14 1994-01-14 Steering bearing assembly for a bicycle

Country Status (1)

Country Link
CA (1) CA2113533A1 (en)

Similar Documents

Publication Publication Date Title
US5319993A (en) Steering bearing assembly for a bicycle
US5387255A (en) Steering bearing assembly for a bicycle
US5095770A (en) Steering bearing assembly for wheeled vehicle
US4436468A (en) Ball head lock nut as a component element of bicycle head parts
US5586472A (en) Detachable bicycle pedal mounting structure
US6186027B1 (en) Handlebar stem assembly for bicycle fork
US5687616A (en) Handle stem fixing device in a bicycle
US5997104A (en) Device for rotatably supporting a hub of a bicycle wheel
US5540457A (en) Steering assembly with external bearing pre-load adjustment
US5680798A (en) Handlebar stem assembly and fork of a bicycle having expander nut structure
KR100390410B1 (en) Hinge Assembly
US5893574A (en) Bicycle steering assembly
US20070170690A1 (en) Steering bearing assembly for a bicycle
US20110140391A1 (en) Bicycle front fork assembly
US5496126A (en) Bicycle front fork mounting structure
US20070052201A1 (en) Bicycle pedal
US6276234B1 (en) Bicycle crank system
US5865069A (en) Light-weight bicycle handlebar stem for use with non-threaded fork tubes
US4418584A (en) Gear crank for a bicycle
JPS6018483B2 (en) Rolling disc tensioning device
CA2113533A1 (en) Steering bearing assembly for a bicycle
CA3102344C (en) Axle assembly having an adjustable length
US20060061058A1 (en) Steering bearing assembly for vehicle
US7073996B1 (en) Two-piece crank hanger set for bicycles
US5100217A (en) Wheel bearing

Legal Events

Date Code Title Description
EEER Examination request
FZDE Discontinued