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Title:
A BICYCLE WITH ANTI-THEFT PROTECTION.
Document Type and Number:
WIPO Patent Application WO/2008/119349
Kind Code:
A1
Abstract:
A bicycle with anti-theft protection, where a kickstand having one or two unfoldable legs is disposed below the crank (2) of the bicycle, so that the legs block the movement of the pedals (3) of the bicycle in an unfolded support position, and where the legs are also capable of assuming a folded together position when being pulled into a pipe (15), which is disposed above the legs, by means of a pull rod on which the legs are pivotably mounted, so that the legs are folded together and retracted into the pipe by a pull of the pull rod, and where means are provided by which the pull rod may be fixed in the two positions which correspond to the support position of the legs and their position inside the pipe. The pipe (15), into which the legs (4) are retracted (the guide pipe), is contained in or is formed by the pipe in the frame of the bicycle which extends from areas at the crank (2) upwards toward the saddle, said pipe being open at the end facing toward the crank. This provides a simple and practical structure, where the arrangement does not affect the physical appearance or the properties of the bicycle, such as air resistance.

Inventors:
LARSEN CONNY MARIANNE
Application Number:
DK2008/000119
Publication Date:
October 09, 2008
Filing Date:
March 28, 2008
Export Citation:
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Assignee:
MADSEN, Kurt (Hojtoften 38, Aars, DK-9600, DK)
International Classes:
B62H1/04; B62H5/08; B62K19/30
Foreign References:
BE354753A
DE4219579A11992-10-22
LV10757B1995-12-20
JPH0322982U1991-03-11
EP0849148A21998-06-24
DE10107902A12002-09-19
Attorney, Agent or Firm:
LARSEN & BIRKEHOLM A/S (Skandinavisk Patentbureau, Banegårdspladsen 1, Copenhagen V, DK-1570, DK)
Download PDF:
Claims:
PATENT CLAIMS

1. A bicycle with anti-theft protection, wherein the anti-theft protection is of the type where a kickstand having one or preferably two unfoldable legs is disposed below the crank (2) of the bicycle such that, in an unfolded sup- Dort position, the legs block the movement of the pedals (3) of the crank, and wherein the legs may also assume a folded-together position when oeing pulled into a pipe (10), which is disposed above the legs, by means of a pull rod on which the legs are pivotably mounted, so that the legs are folded together and retracted into the pipe by a pull of the pull rod, and wherein means are provided by which the pull rod may be fixed in the two positions which correspond to the support position of the legs and their position inside the pipe, c h a r a c t e r i z e d in that the pipe (10), into which the legs (4) are retracted (the guide pipe), is contained in or is formed by the pipe in the frame of the bicycle which extends from the area at the crank (3) upwards toward the saddle, said pipe being open at the end facing toward the crank.

2. A bicycle with anti-theft protection according to claim I . c h a r a c t e r- i z e d in that the upper end of the pull rod is provided with a tension spring

(21 ), which is connected with the frame of the bicycle.

3. A bicycle with anti-theft protection according to claim 1 or 2, c h a r a c t e r i z e d in that the guide pipe is configured with a longitudinal slit (11) of a length which corresponds to the distance between the unfolded support position of the support legs and their fully retracted position, and which serves as a guide for a handle (5) which is connected with the pull rod (9), and with which the pull rod may be displaced between the said two positions.

4. A bicycle with anti-theft protection according to claim 3, c h a r a c t e r-

RECTiFlED SHEET (RULE 91)

i z e d in that the longitudinal slit has a short transverse branch (22) at the ends.

5. A bicycle with anti-theft protection according to any one of claims 1-4, characterized in that, at the end facing toward the crank of the bicycle, the guide pipe is configured with two engagement faces (18) which form an angle corresponding to the angle of the support legs in the support position.

6. A bicycle with anti-theft protection according to claim 5, characterize d in that the engagement faces are formed by a cone-shaped collar.

7. A bicycle with anti-theft protection according to any one of claims 1-6, characterized in that the means for fixing the pull rod in the two po- sitions are formed by a locking pawl (6), which is arranged on the guide pipe and with a pawl bolt (13) which extends through mating holes in the guide pipe and in the pull rod in each of the locked positions.

8. A bicycle with anti-theft protection according to claim 7, character- i z e d in that the locking pawl is formed by a portion of a cylinder lock with a removable key.

Description:

A BICYCLE WITH ANTI-THEFT PROTECTION

The invention relates to a bicycle with anti-theft protection, wherein the anti- theft protection is of the type where a kickstand having one or preferably two unfoldable legs is disposed below the crank of the bicycle such that, in an unfolded support position, the legs block the movement of the pedals of the bicycle, and wherein the legs are also capable of assuming a folded- together position when being pulled into a pipe (the guide pipe), which is disposed above the legs, by means of a pull rod on which the legs are piv- otably mounted, so that the legs are folded together and retracted into the pipe by a pull of the pull rod, and wherein means are provided by which the pull rod may be fixed in the two positions which correspond to the support position of the legs and their position inside the pipe.

Bicycles with anti-theft protection of this type are known, where the guide pipe, which receives the support legs folded together, is arranged on the frame, typically at the side of the pipe which extends from the crank up toward the saddle. An arrangement of this type is described in BE 354 753. Related arrangements are seen in e.g. German Utility Model No. 206 787 and in Japanese Patent Application No. 9230357.

It is common to these known arrangements that they necessitate the mounting of elements externally on the frame of the bicycle, which makes the structure complicated and has a considerable impact on the air resis- tance of the bicycle and its appearance and look.

The object of the present invention is to provide a bicycle with an anti-theft protection of the above-mentioned type which is completely integrated in the bicycle, so that it maintains its appearance, and which does not require any addition of elements which may have an adverse impact on the air resistance.

This is achieved according to the invention by a bicycle with anti-theft protection of the stated type, where the pipe, into which the legs are retracted (the guide pipe), is contained in or is formed by the pipe in the frame of the bicycle which extends from the area at the crank upwards toward the saddle, said pipe being open at the end facing toward the crank, as is stated in claim 1.

Using, in this manner, this pipe, which is already present on the bicycle, provides a simple manner of accomplishing the anti-theft protection, which has practically no impact on the properties or the appearance of the bicycle.

The stated pipe is open at the end which faces toward the crank, so as to provide for the necessary space for the support legs. In many modern bicycles, the pipes are bulky and make room for this arrangement, otherwise the pipe may be arranged slightly offset rearwards relative to the crank.

The pull rod may be connected with the frame of the bicycle by a tension spring, as stated in claim 2, whereby the retraction of the support legs is facilitated and may optionally take place almost without any application of force to the pull rod.

Configuration of the guide pipe with a longitudinal slit which cooperates with a handle, as stated in claims 3 and 4, brings about a particularly simple and effective way of performing the retraction and extension of the support legs.

When, as stated in claims 5 and 6, the lower opening of the guide pipe is configured with inclined engagement faces, the support legs may be fixed at the desired angle in a simple manner.

As stated in claims 7 and 8, the pull rod may be fixed in the two positions by means of a pawl, which extends through holes in the pipe and the pull rod,

and which may be formed by the locking pawl in a cylinder lock.

The invention will now be explained with reference to the drawing, in which

fig. 1 shows the position of the locking unit on the bicycle,

fig. 2a shows details of the inner guide cylinder of the support legs and their suspension from the guide mechanism,

fig. 2b shows a lateral view of the details shown in fig. 2a,

fig. 3a shows a longitudinal section of the lock in the upper lockable position (I) of the support legs,

fig. 3b shows a longitudinal section of the lock in the lower lockable working position of the support legs,

fig. 4 shows a section of the outer pipe of the lock with the arrangement of the locking handle in the guide slit.

The lock for anti-theft protection of a bicycle is expediently disposed in the frame part 1 between the saddle 2 and the crank area with the pedals 3, as shown in fig. 1. It is essential to the function of the lock as a blocking feature for the pedals 3 that the support legs 4 do not collide with the crank shaft during the extension from the frame part 1 , but that an extension of the legs takes place immediately behind the crank shaft.

Modern bicycle design frequently uses other constructional details than the previously known ones. Previously, e.g., the most usual thing was that the crank area was positioned at the lower end of the frame part 1.

Frame structures of modern bicycles, however, frequently incorporate frame parts of an oval cross-section for aerodynamic reasons. In these types of bicycles, the frame part will easily allow the extension of the support legs to take place immediately behind the crank shaft.

The same applies if the crank - as is the case in many bicycles - has been moved forwards relative to the lower end of the frame part 1.

Figs. 2a and 2b show details of the guide mechanism. It comprises a pull rod in the form of a pipe 9 whose length is adapted such that, in their retracted position of rest (I), the support legs 4 are concealed completely in an outer cylindrical pipe 10 (not shown).

When the inner cylindrical pipe (the pull rod) 9 is made longer, it is possible also to achieve to operational advantage that the two locking positions (I and II) of the anti-theft protection may be moved further upwards toward the saddle post.

An attachment device for the attachment of a tension spring 21 (return spring) is arranged at the upper, open end of the pull rod 9. This tension spring 21 , whose upper end is secured to the outer pipe 10 (not shown), contributes to facilitating the operation of the lock by automatically moving the pull rod 9 upwards toward the upper locking position (I).

Figs. 2a and 2b moreover show how the two support legs 4 are pivotably suspended from the lower end of the pull rod. Here, the pipe is flattened so as to provide two opposed recesses 19. The recesses 19 are dimensioned in the width so that the width is the same as the diameter of the pull rod, and so that the recesses 19 may hereby be displaced unobstructedly inside the outer pipe 10. The upper end of the support legs is pivotably secured at suspension points 17 on the opposed side faces of the recesses 19 by

means of a screw connection extending therethrough. With the purpose of stabilizing the parking of the bicycle, the support legs 4 are provided with support faces 16 at their free end which engage the substrate 20. The support faces 16 may optionally be configured as rolls of metal or plastics to facilitate the swing of the support legs to their outer position on firm substrates 20.

Fig. 2a also shows a lateral view of the handle 5. This may be a displace- able ring, which surrounds the frame part, and which, when being activated, slides up and down it, or it may be configured as a cylindrical shaft of a suitable length, which is machined at one end to a thin cylindrical neck 8, which ends in a threaded part 7. This threaded part is mounted in a threaded hole in the pull rod 9. Further, the figure shows two locking holes 15 which are moved through the pipe wall of the pull rod 9, and whose mu- tual distance corresponds to the distance between the two locking positions I and Il of the anti-theft protection.

The two locking holes 15, with which a locking pawl 13 of the locking device 6 is engaged in the locking positions of the anti-theft protection, are fixed in their vertical plane of movement by means of a guide slit 11 in the outer pipe 10. The cylinder lock 6 is fixedly mounted on the frame part 1 , and its position relative to the upper locking hole 15 is shown in fig. 2b, just as also the locking pawl 13 in engagement with this locking hole 15 is indicated. Thus, the two figures show the cooperation between the three sub-ele- ments of the anti-theft protection, the support legs 4, the handle 5 and the locking device 6, when the anti-theft protection is in its lower, lockable position II, in which the pedals will be blocked.

Figs. 3a and 3b show longitudinal sections of the outer pipe 10 in the two lockable positions I and Il of the anti-theft protection. It also appears from the figures how the outer pipe 10 surrounds the guide mechanism accord-

ing to figs. 2a and 2b. The handle 5 may be moved between the two outer positions in the guide slit 11 in the outer pipe 10.

Fig. 4 shows a smaller section of the outer pipe 10. The guide slit 11, which is also passed through the frame part 1, extends longitudinally of the pipe

10 and the frame part 1 , and it has an extent in the length which is limited by the two locking positions I and II. At its upper and lower ends, the guide slit 11 may be configured with transverse locking areas 22, in which the cylindrical neck 8 of a locking handle may be twisted inwards to retain the two locking positions.

The configuration of the locking areas and the width of the guide slit 11 are adapted to the diameter of the machined cylindrical neck 8 on the locking handle 5 in such a manner that play is avoided or minimized as much as possible.

RECTIFIED SHEET (RULE 91) ISA/EP