Adjustable parking frame of bicycle

An adjustable bicycle parking frame comprises a fastening plate, an inner rod, a support rod and an adjustment rod. The parking frame can be turned and located by a spring, an outer tube and a fitting ring, which are disposed between the fastening plate and the inner rod. Located at the bottom of the inner rod is a receiving space having on the top edge thereof a round hole in which a spring and a retaining block are received. The support rod is provided at the bottom thereof with a support block and at the top thereof with an outer threaded portion. The adjustment rod is provided axially with a fitting hole having therein at the midpoint thereof an inner threaded portion engageable with the outer threaded portion of the support rod. The fitting hole is provided therein at the top end thereof with a retaining groove engageable with the retaining block of the inner rod when the inner rod is fitted into the fitting hole of the adjustment rod. The length adjustment of the support rod is attained by turning the adjustment rod.

FIELD OF THE INVENTION 
The present invention relates generally to a bicycle, and more particularly 
to an adjustable bicycle parking frame. 
BACKGROUND OF THE INVENTION 
As shown in FIG. 1, a prior art bicycle parking frame comprises mainly a 
plate 11 and a support rod 12. Such a bicycle parking frame as described 
above is intended to support the bicycle on the ground in a slightly 
tilting manner. The plate 11 is fastened securely with the bicycle frame. 
The support rod 12 is fastened with the plate 11 such that the support rod 
12 can be caused to swivel so as to support the parked bicycle in a 
slightly tilting manner. The optimum inclination, at which the bicycle is 
parked, ranges between 6 and 12 degrees. In other words, a bicycle which 
is parked at the inclination smaller than 6 degrees or greater than 12 
degrees is vulnerable to toppling. 
It is necessary to provide a bicycle with a parking frame of an appropriate 
size in accordance with the size of the bicycle frame. There are bicycle 
frames of various sizes. Accordingly, the bicycle parking frames of 
various sizes must be made. Such a manufacturing practice of making the 
bicycle parking frames of various sizes is not cost-effective. In 
addition, the prior art bicycle parking frames are defective in design in 
that they do not allow a bicyclist to adjust at will the inclination at 
which the bicycle is parked. 
With a view to overcoming the drawbacks of the prior art bicycle parking 
frames described above, a variety of new and improved bicycle parking 
frames were disclosed. The known bicycle parking frames are adjustable in 
length; nevertheless they are rather complicated in construction and can 
not be made economically. 
SUMMARY OF THE INVENTION 
It is therefore the primary objective of the present invention to provide 
an adjustable bicycle parking frame which can be easily adjusted in length 
without the use of a hand tool and made economically. 
It is another objective of the present invention to provide an adjustable 
bicycle parking frame which is rather exquisite in construction and gives 
an added value to a bicycle to which the parking frame is fastened. 
The foregoing objectives of the present invention are accomplished by the 
adjustable bicycle parking frame, which comprises mainly a fastening plate 
provided at the bottom thereof with an inner rod which is in turn provided 
on the outer edge of the midpoint thereof with two protuberances having a 
flat top. Located between two protuberances and the fastening plate are a 
spring, an outer tube and a collar for enabling the parking frame to 
swivel and locate. 
The inner rod is provided at the bottom thereof with a receiving space 
having axially a sliding slot. Located between the top edge of the 
receiving space and two protuberances is a first round hole in which a 
spring and a retaining block are received. A support rod is provided at 
the bottom thereof with a support block and at the top thereof with an 
outer threaded portion having on the top thereof a circular hole. An 
adjustment rod of a cylindrical construction is provided axially with a 
fitting hole having at the midpoint of the inner wall thereof an inner 
threaded portion of a smaller diameter. The inner threaded portion of the 
adjustment rod is engageable with the outer threaded portion of the 
support rod. A pin is received in the circular hole of the outer threaded 
portion of the support rod. The fitting hole of the adjustment rod is 
provided on the inner wall of the top end thereof with a retaining groove 
engageable with the retaining block of the first round hole of the inner 
rod. The parking frame can be adjusted in length by rotating the 
adjustment rod so as to cause the inner threaded portion of the adjustment 
rod to move in relation to the outer threaded portion of the support rod.

DETAILED DESCRIPTION OF THE INVENTION 
As shown in FIGS. 2-8, the adjustable bicycle parking frame embodied in the 
present invention comprises a fastening member 20 and an adjustment member 
40. 
The fastening member 20 comprises a fastening plate 21 of a metal material. 
The fastening plate 21 is fastened securely with the bicycle frame and is 
fastened at the bottom thereof with an inner rod 23 by means of a locating 
pin 22. The inner rod 23 is provided on the outer surface of the midpoint 
thereof with two protuberances 231, which have respectively a flat top and 
are opposite in location to each other. The protuberances 231 are urged by 
a spring 24 which is fitted into an outer tube 25 and is provided at the 
top end thereof with a collar 26 fitted thereover. The bicycle parking 
frame of the present invention can be caused to swivel and locate, thanks 
to the fastening plate 21, the inner rod 23, the spring 24, the outer tube 
25 and the collar 26, which are all similar in construction and function 
to those of the bicycle parking frames of the prior art and will not be 
therefore described further. The inner rod 23 is provided at the bottom 
end thereof with a receiving space 232 of a predetermined depth. The 
receiving space 232 is provided axially on one side thereof with a sliding 
slot 233, as shown in FIG. 6, and is further provided on the top edge 
thereof with two circular holes 234 and 235 which are located on the 
peripheral surfaces located between the top edge of the receiving space 
232 and two protuberances 231. The circular hole 234 is intended to 
receive therein a spring 31 and a retaining block 33 while the circular 
hole 235 is to accommodate therein a spring 33 and a steel ball 34, as 
shown in FIGS. 7 and 8. 
The adjustment member 40 comprises an adjustment rod 41 and a support rod 
42. The adjustment rod 41 has a fitting hole 43 which is provided on the 
inner wall of the midpoint thereof with an inner threaded portion 44 
smaller in the inner diameter. The fitting hole 43 is provided in the 
upper end thereof with a pivoting ring 54 which is made of a plastic 
material and is fitted thereinto. The pivoting ring 54 has an inner 
diameter slightly greater than the outer diameter of the inner rod 23 and 
is provided on the inner wall of the lower portion thereof with a 
retaining groove 45. Located equidistantly on the peripheral surface 
between the retaining groove 45 and the inner threaded portion 44 are four 
round through holes 46. The support rod 42 is provided at the bottom 
thereof with a support block 47 and at the top thereof with an outer 
threaded portion 48 engageable with the inner threaded portion 44 of the 
adjustment rod 41. The outer threaded portion 48 is provided at the top 
thereof with a circular hole 49 and at the bottom thereof with a plastic 
pivoting jacket 56 fitted thereover. The pivoting jacket 56 has an outer 
diameter slightly smaller than the inner diameter of the fitting hole 43 
of the adjustment rod 41. 
In combination, the outer threaded portion 48 of the support rod 42 is 
engaged with the inner threaded portion 44 of the adjustment rod 41, as 
shown in FIG. 4. A pin 52 is inserted into the circular hole 49 of the 
outer threaded portion 48 so as to ensure that the outer threaded portion 
48 does not become disengaged with the inner threaded portion 44 when the 
support rod 42 and the adjustment rod 41 are loosened to be in the state 
of retreating. Thereafter, the inner rod 23 of the fastening member 20 is 
fitted into the fitting hole 43 of the adjustment rod 41 such that the pin 
52 of the outer threaded portion 48 is received in the sliding slot 233 of 
the inner rod 23, as shown in FIG. 6. In the meantime, the retaining block 
32 and the steel ball 34, which are located in the circular holes 234 and 
235, are forced by the springs 31 and 33 to be retained in the retaining 
slot 45 and the through hole 46 of the adjustment rod 41, as shown in 
FIGS. 7 and 8. As a result, the adjustment rod 41 can not be disengaged 
with the inner rod 23. In other words, the adjustment rod 41 and the inner 
rod 23 can be rotated in relation to each other, thanks to the retaining 
block 32 which is inserted into the retaining slot 45 of the adjustment 
rod 41. 
The support rod 42 of the present invention can be adjusted in length by 
turning the adjustment rod 41 as to cause the support rod 42 to displace 
up and down by the guiding effect of the outer threaded portion 48 of the 
support rod 42 and the inner threaded portion 44 of the adjustment rod 41. 
It must be noted here that the support rod 42 can not be caused to rotate 
in relation to the inner rod 23 when the adjustment rod 41 is turned, in 
view of the fact that the pin 52 of the support rod 42 is confined by the 
sliding slot 233 when the adjustment rod 41 is turned. For this reason, 
the support rod 42 is caused to move up and down in the axial direction 
when the adjustment rod 41 is turned. 
When the adjustment rod 41 is turned for an angle of 90 degrees, the steel 
ball 34 is caused to be retained in another through hole 46 by a pressure 
exerting thereon. As a result, the length adjustment of the support rod 42 
can be easily regulated by the extent to which the adjustment rod 41 is 
rotated. 
Furthermore, it must be noted that the pivoting ring 54 of the adjustment 
rod 41 is fitted over the inner rod 23, and that the pivoting jacket 56 of 
the support rod 42 is fitted into the fitting hole 43 of the adjustment 
rod 41. As a result, the action of the axial rotation of the adjustment 
rod 41 in relation to the inner rod 23 can be brought about with ease and 
precision. In other words, the eccentric rotation of the adjustment rod 41 
is averted. 
The embodiment of the present invention described above is to be regarded 
in all respects as merely illustrative and not restrictive. Accordingly, 
the present invention may be embodied in other specific forms without 
deviating from the spirit thereof. The present invention is therefoe to be 
limited only by the scope of the following appended claims.