Patent ID: 7518496

Claim:
A transmitter unit of an apparatus for monitoring the condition of a tire, the tire being secured to a rim wheel, the transmitter unit comprising: a casing having an opening defined in an end of the casing, wherein the casing includes a first projection; a transmitter for gathering and wirelessly transmitting information regarding the condition of the tire, wherein the transmitter is inserted through the opening into the casing in a first direction, which is a tangential direction with respect to the rim wheel, thereby being received in the casing, wherein the transmitter includes a second projection, the second projection being engaged with the first projection of the casing by inserting the transmitter into the casing in the first direction through the opening, thereby preventing the transmitter from moving in a second direction, which is opposite to the first direction; an adhesive member by which the casing is secured to an outer circumferential surface of the rim wheel; and an urging member for urging the transmitter received in the casing in the second direction.