Abstract: A helmet has both functions of a cap body of the full face type for protecting a wide area and a cap body of the jet type for exposing a large window opening. An auxiliary cap body is mounted on left and right opposite sidewalls of a main cap body of the jet type having the large window opening for turning between a lowered position in which the auxiliary cap body covers a lower half of the large window opening, and a lifted position in which the entire large window opening is exposed. And a lock mechanism is provided for automatically locking the auxiliary cap body to the main cap body in the lowered position of the auxiliary cap body. Thus, when the helmet is brought into the full face type state, the locking of the auxiliary cap body to the main cap body can reliably and easily be achieved.

Abstract: In a helmet for riding a vehicle, a chin cover is expandably and contractibly upholstered at a lower edge of a chin covering portion for covering the user's chin. At least a portion of the chin cover is formed of a mesh material, so that the flowing-out of a user's exhalation through the mesh material is promoted by wind flowing along a lower surface of the chin cover. Thus, it is possible to prevent a wind-cutting sound due to an inclusion of the wind into the chin covering portion of the cap body and to eliminate the stay of the user's exhalation in the chin covering portion.

Abstract: In an air intake device in a helmet, a recess is defined in a front wall of a shell of a cap body so as to be recessed inwardly of the shell, and has an opening defined in an upper surface of the recess to communicate with the inside of the cap body. A shutter plate is inserted into the opening for opening and closing the recess. A guide rod is projectingly disposed on a back surface of the shutter plate, so that it comes into sliding contact with an innermost wall of the recess and is slidably received in a guide hole provided in a lower wall of the recess. The shell of the cap body is provided with a function of a shutter housing, thereby eliminating the need for an exclusive shutter housing and simplifying the air intake device.

Abstract: In an air intake device in a helmet, a housing is molded as one piece from a synthetic resin material and as an upper wall, a lower wall, a left end wall and a right end wall. First and second recesses are defined in the back surface of the upper wall and in the front surface of the lower wall, respectively, so as to communicate with each other to define a shutter chamber. Wind guide sleeves are formed on the lower wall which are opened and closed by a shutter plate which is vertically accommodated in the shutter chamber. The housing of shutter as an essential part of the air intake device in the cap body is formed of a single piece of a synthetic resin, thereby providing a simplified structure.

Abstract: A vehicle helmet, including a cap body comprised of a shell and a shock absorbing liner fitted to an inner surface of the shell, and a longitudinally extending air duct which is provided in a wall of of the cap body, such that the inside of the cap body can be ventilated through the air duct, wherein at least a portion of the shock absorbing liner is divided into an outer layer on the side of the shell, and an inner layer superposed on an inner surface of the outer layer, the inner and outer layers having recessed grooves provided in opposed surfaces thereof to define an air duct, the inner layer having a vent hole. Thus, air-stream flowing into the air duct can flow at a high rate without any leakage, thereby reliably performing a ventilation of the inside of the cap body.

Abstract: Support portions are integrally molded on an inner surface of a helmet shell made of synthetic resin for supporting folded-back portions of a chin belt, and belt holes, through which the chin belt is passed, are provided in a shock-absorbing liner in correspondence to the support portions. Thus, the chin belt can be simply attached to a cap body without use of any separate support plate and rivet, thereby providing a cost reduction and a better external appearance.