FIELD OF INVENTION 0001 The present invention relates to a bicycle and, more particularly, to a turn signal of a bicycle.

BACKGROUND OF INVENTION 0002 Taiwanese Patent Publication No. 405559 discloses a turn signal of a bicycle. The turn signal includes a lens 10, a reflector 30, a circuit 20 installed in the reflector 30, a cap 40 for keeping a battery in the reflector 30 and a plug 50 secured to the cap 40. A switch 24 is mounted on the reflector 30 and connected with the circuit 20. The bicycle includes a right grip 61 and a left grip 61. A right turn signal is attached to the right grip 61 through inserting its plug 50 in the right grip 61. A left turn signal is attached to the left grip 61 through inserting its plug 50 in the left grip 61. However, the turn signals are not easily observable from the back. 0003 The present invention is therefore intended to obviate or at least alleviate the problem encountered in prior art.

SUMMARY OF INVENTION 0004 It is the primary objective of the present invention to provide a turn signal that is easily observable from the back. 0005 To achieve this objective, the turning signal includes a transmitting device attached to the handle for transmitting a wireless signal, a receiving device attached to the bicycle for receiving the wireless signal, and a light electrically connected with the receiving device for signaling an intention to turn the bicycle. 0006 It is another objective of the present invention to provide a turn signal that is easily observable from the front and the back. 0007 To achieve this objective, the turning signal includes a transmitting device attached to the handle for transmitting a wireless signal, a front light electrically connected with the transmitting device for signaling an intention to turn the bicycle, a receiving device attached to the bicycle for receiving the wireless signal, and a rear light electrically connected with the receiving device for signaling an intention to turn the bicycle. 0008 Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the attached drawings.

BRIEF DESCRIPTION OF DRAWINGS 0009 The present invention will be described through detailed illustration of embodiments referring to the attached drawings wherein: 0010 FIG. 1 is a perspective view of a according to the present invention. 0011 FIG. 2 is an exploded view of the shown in FIG. 1. 0012 FIG. 3 is a cross-sectional view of the shown in FIG. 1.

DETAILED DESCRIPTION OF EMBODIMENTS 0013 Referring to FIG. 1, a bicycle 70 includes a handle 71 with two ends and a rear fork 72 with two prongs. According to a first embodiment of the present invention, a turn signal includes a transmitting unit 30 attached to the right or left end of the handle 71 and a receiving unit 60 attached to the right or left prong of the rear fork 72. 0014 A rider can operate the transmitting unit 30 so as to transmit a wireless signal to the receiving unit 60. On receiving the wireless signal, the receiving unit 60 provides light in order to signal the rider's intention to turn right or left. 0015 FIGS. 25 show that the transmitting device 30 is attached to the right end of the handle 71. 0016 Referring to FIGS. 3 and 4, a plug 40 is fit in the right end of the handle 71. An adjusting device 50 is used for adjusting the extent to which the plug 40 abuts against an internal face of the right end of the handle 71. A housing 10 is connected with the plug 40. A power supply 20 is put in the housing 10. The transmitting unit 30 is connected with the housing 10 and electrically connected with the power supply 20. 0017 The plug 40 defines a tunnel extending throughout its axis. The tunnel includes an oblong section 41, a first circular section 44, a second circular section 45, a third circular section 46, a fourth circular section 47 and a conical section 48. Two grooves 49 are communicated with the fourth circular section 47 of the tunnel. The plug 40 includes several slits 42, thus dividing the plug 40 into a corresponding number of claws 43. 0018 The adjusting device 50 includes a bolt 51 and a conical nut 52. The bolt 51 is inserted into the circular sections 46 and 47 of the tunnel. An enlarged head of the bolt 51 is retained in the second circular section 45 of the tunnel. The conical nut 52 is put in the conical section 48 of the tunnel. Two fins 53 formed on the conical nut 52 are inserted in the grooves 49, thus avoiding rotation of the conical nut 52 relative to the plug 40. The conical nut 52 is engaged with the bolt 51. The plug 40 is fit into the right end of the handle 71. The conical nut 52 can be moved towards the enlarged of the bolt 51 by rotating the bolt 51, thus pushing the claws 43 outwardly for tighter abutment against the internal face of the right end of the handle 71. 0019 The housing 10 includes a first end at which a socket 11 is formed and a second end at which an anchor 13 is formed. A switch 12 is mounted on the housing 10. The anchor 13 includes a cylindrical portion and an oblong portion. 0020 The power supply 20 includes two batteries put in the housing 10. The power supply 20 is electrically connected with the switch 12. 0021 The transmitting unit 30 includes a transmitter 34, a light 35 and a support 36 on which the transmitter 34 and the light 35 are mounted. The support 36 is shaped like a portion of a ball. A buffer 31 is put in the socket 11. A bolt 32 and a spring 33 are put in the housing 10. The spring 33 is mounted on the bolt 32. The support 36 is put in the buffer 31. The bolt 32 is driven into a hole 37 defined in the transmitting unit 30, thus connecting the transmitting unit 30 with the housing 10. Thus, the support 36 and the socket 11 form a ball-and-socket mechanism, i.e., rotation of the support 36 relative to the socket 11 is allowed. 0022 The oblong portion of the anchor 13 is put in the first circular section 44 through the oblong section 41 of the tunnel. Then, the anchor 13 is rotated, thus attaching the housing 10 to the plug 40. 0023 Referring to FIGS. 4 and 5, the transmitting unit 30 is pivotal relative to the housing 10 0024 Referring to FIG. 1, the receiving unit 60 includes a light 61, a clip 62 and a receiver 63. Because of the clip 62, the receiving unit 60 can be held in any proper position on the right or left prong of the fork 72. The receiver 63 can receive the wireless signal from the transmitter 34. On receiving the wireless signal, the receiver 63 turns on the light 61. 0025 FIG. 6 shows two turn signals according to a second embodiment of the present invention. The second embodiment is identical to the first embodiment but including a selection unit 80 instead of the switch 12. The selection unit 80 includes two buttons 81 and 82. Via pressing one of the buttons 81 and 82, the rider can actuate the transmitter 34 of the turn signal mounted on one of the ends of the handle 71. The rider can easily reach the buttons 81 and 82 with the thumb of his right hand. The selection unit 80 may alternatively include a transmitter 83 instead of the transmitter 34. 0026 The present invention has been described via detailed illustration of two embodiments. Those skilled in the art can derive variations from the embodiments without departing from the scope of the present invention. Therefore, the embodiments shall not limit the scope of the present invention defined in the claims.