In-vehicle cup holder and combined in-vehicle implement containing same

An in-vehicle cup holder, comprising:

• a cup holder housing, the cup holder housing being provided therein a cup holder foot support and a knob member;
• wherein the knob member is disposed above the cup holder foot support, and the cup holder foot support is extended and retracted under an effect of the knob member;
• the knob member comprises:
• a knob lower case, a knob upper case disposed on the knob lower case, a knob cover plate, and a knob mechanism, wherein the knob mechanism is mounted on the knob upper case, and the knob cover plate is mounted on an inner side wall of the cup holder housing and is in contact with the knob mechanism;
• the knob upper case comprises:
• a first screw hole, a first mounting slot, and a track, wherein the first screw hole is disposed in correspondence to a second screw hole on the knob lower case and is configured to connect the knob upper case to the knob lower case, and the knob mechanism is mounted in the first mounting slot;
• the knob cover plate comprises:
• a first serration and a third screw hole, wherein the first serration is disposed on an inner side wall of the knob cover plate, and the third screw hole is disposed in correspondence to a fourth screw hole on the cup housing;
• and
• the knob mechanism comprises:
• two rotation button, a spring, a gear, a rack, a second serration, and a mounting cavity, wherein the gear is disposed in correspondence to the rack and disposed at a middle portion of the knob mechanism, each of the two rotation buttons is disposed on one side of the gear, the spring is mounted inside the mounting cavity, one end of the spring is in contact with a fascia on the knob upper case, the other end of the spring is in contact with the mounting cavity, the second serration is disposed on each of two ends of the knob mechanism, the second serration is disposed in correspondence to the first serration, and the second serration is bi-directionally slidable on the track.