Abstract: A vehicle seat apparatus includes: a receiving device provided on a seat of a vehicle, where an auxiliary battery and a portable electronic device are received in the receiving device, and a controller that controls power transmission between the auxiliary battery received in the receiving device and a convenience device of the seat. The receiving device is provided on a back board of the seat, and the auxiliary battery and the portable electronic device may be received in the receiving device or taken from the receiving device. During charging, the auxiliary battery is charged with power of a vehicle power supply or the portable electronic device is wirelessly charged with power of the auxiliary battery in normal times, and the power of the auxiliary battery may be supplied to the convenience device of the seat in an emergency.

Abstract: Disclosed is a ball sleeve structure. The ball sleeve structure has convex ball portions and grooves. The convex ball portions are formed at the middle of its outer circumference and are tightly coupled within a ball race in a housing of a variety of joints. The grooves are formed at both sides of its outer circumference and are coupled with sealing boots. The ball portions are formed at regular thickness in the whole portions, by swaging predetermined portions in a hollow tube with holes at the center thereof, such that a metal flow is continuously connected. The ball sleeve structure can be simply and easily manufactured and has excellent strength and reduced amount of material, thereby being capable of achieving a reduction in the manufacturing costs and a reduction in the weight of the product.