JPS6238474Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a front fork locking device for locking a head pipe and a front fork in a bicycle frame.

This idea firstly starts moving while parked,
Alternatively, this was done to prevent falls as a result. That is, a bicycle is equipped with a front basket integrated with a front fork for carrying shopping, etc., but when luggage is placed in the front basket, the center of gravity changes and the bicycle starts to move, or the bicycle may fall over.
This is an attempt to improve this point. Second, the purpose is to provide convenience when folding and transporting folding bicycles and the like. Thirdly, the purpose of this invention is to provide a locking device which has a simple structure and is highly reliable in terms of operability, handle handling, and durability.

This invention will be explained below with reference to the drawings which are an example of implementation. 1 is a head pipe, 2 is a front fork, and a stem 3 is integrally connected to the upper end. Reference numeral 4 denotes a lock pin, which is supported by the support body 5, and whose tip is slid back and forth by a knob 6 connected to the rear end protruding outward from the rear surface 5b opposite to the mounting surface 5a. It is provided so as to be freely retractable from the mounting surface 5a, and an annular groove 7 is provided on the outer periphery of the mounting surface 5a.
The support body 5 is provided with a housing chamber 8 corresponding to the lock pin 4, and an expansion coil spring 10 connecting the ball 9 is housed on the opening edge side of the chamber 8, and the ball 9 is brought into pressure contact with the outer periphery of the lock pin 4. The mounting surface 5a is attached to the head pipe 1 with its mounting surface 5a connected to the approximate center of the back surface of the head pipe 1, and the tip of the lock pin 4 is inserted into and engaged with the lock holes 11 and 12 drilled in the stem 3 of the head pipe 1 and the front fork 2. The front fork 2 is held in place against the front fork. Since the lock pin 4 is pressed against the ball 9, the lock pin 4 is held in that state by its resistance. In the figure, when the lock pin 4 is pulled out rearward, its tip comes out of the lock hole 12 of the stem 3 of the front fork 2, leaving the front fork 2 free, and the ball 9 fits into the annular groove 7 of the lock pin 4. hold in state. In the embodiment, when the lock pin 4 is inserted into the lock hole 12 of the stem 3, the ball 9 is simply brought into pressure contact with the outer peripheral surface of the lock pin 4 to maintain its position. However, an annular groove is provided at this position. , it may be inserted to ensure its operation.

Therefore, 15 is the head drag, 16 is the upper pipe,
17 is a lower pipe, 18 is a front wheel, and 19 is a rear wheel. Of course, the support body 5 may be attached to the outer surface of the head drag 15, and the lock pin 4 may be moved inward and engaged with the lock hole of the stem of the front fork 2.

This device locks the front fork by providing a locking hole in the front fork stem and inserting a locking pin from the outside, so compared to conventional handle locking devices, it is possible to lock the locking member on the outer surface of the head pipe, for example. There is no need to attach a lock pin as a lock member, and the structure is extremely simple, and by attaching an elastic support mechanism to the lock pin, it does not operate while driving, making it safe. Further, since the lock pin is attached to the back side of the head pipe as in the embodiment, it can be hidden from the design point of view.

In addition, by locking the front fork, the front wheel does not turn left or right, so when storing luggage in the front basket, it is stable and does not accidentally fall over, and the As in the embodiment shown, a head drag 15 is provided, and support shafts 20 and 21 are arranged at the upper and lower rear of the head pipe 1, and the tips of the upper pipe 16 and the lower pipe 17 are pivoted to these, and the upper pipe 16 is Especially in the case where the front wheel 18 is rotated forward and folded as shown by the temporary line below the lower pipe 17, the front wheel 18
are held on the same line with respect to the frame, making it easy to fold without fear of falling over during folding, and the front wheels do not move, making it easy to carry.

[Brief explanation of the drawing]

The drawings illustrate the case where this invented device is implemented on a folding bicycle, in which Figure 1 is a side view of the entire folding bicycle, Figure 2 is a cross-sectional explanatory view of the main parts,
FIG. 3 is a partially cutaway side view as well. 1... Head pipe, 2... Front hawk, 3...
Front Hawk stem, 4... Lock pin, 5... Support, 6... Knob, 7... Annular groove, 8... Coil spring, 9... Ball, 11, 12... Lock hole, 13... Frame.

Claims (1)

[Scope of utility model registration request] A front fork in a bicycle frame, characterized in that a lock hole is provided in the front fork stem, and a lock pin that protrudes and retracts into a head pipe and engages with the lock hole is installed on the outer side of the head pipe in association with an elastic support mechanism. locking device.