Movable body feeding apparatus
To provide a movable body feeding apparatus at a low cost by reducing a number of parts and making manufacturing process such as a molding, an assembling or the like simpler, the apparatus employs a tubular body ( 8 ) obtained by integrally forming a thread tube ( 8 a ), a ratchet gear ( 8 e ) in a side of a main body tube ( 1 ) and an elastic body ( 8 b ), instead of the conventional structure that a pair of ratchet gears are arranged between an engaging mechanism in a side of a main body tube and a compression coil spring, in which it is necessary to separate the engaging mechanism side and the compression coil spring side, and three parts (a plurality of parts) are required.
1. A movable body feeding apparatus comprising:
a main body tube;
a thread tube which is arranged within the main body tube, is engaged with said main body tube so as to be synchronously rotatable and has a female thread formed in an inner peripheral surface thereof;
a stick-shaped movable body in which a male screw engaging with said female thread is formed in an outer peripheral surface thereof;
an operating tube which is connected to a rear end side of said main body tube so as to be relatively rotatable and is provided with an engaging portion engaging said movable body so as to be synchronously rotatable and be slidable in an axial direction;
a pair of ratchet gears which are respectively provided in a side of the threaded tube and a side of the operating tube; and
an elastic body which energizes such that the ratchet gears are engaged with each other;
said movable body being sequentially fed on the basis of a relative rotation of said main body tube and said operating tube,
wherein the movable body feeding apparatus is provided with a tubular body in which said thread tube, the ratchet gear in said threaded tube side and said elastic body are integrally formed.
2. A movable body feeding apparatus as claimed in claim 1 , wherein said pair of ratchet gears are arranged so as to oppose in an axial direction, said elastic body is constituted by a compression spring energizing in such a manner that said ratchet gears are engaged with each other, and said tubular body is constituted by an integrally molded product with a resin, has said thread tube in a leading end portion, has said main body tube side ratchet gear in a rear end portion, is integrally formed so as to have said compression spring connecting the leading end portion and the rear end portion, and is arranged so as to be pinched between said main body tube and said operating tube in such a manner that said movable body passes through an inner side thereof.
3. A movable body feeding apparatus as claimed in claim 2 , wherein the ratchet gear in said operating tube side is provided in the leading end surface of said operating tube.
4. A movable body feeding apparatus as claimed in claim 2 , wherein the engaging portion of said operating tube is provided at plural number in the inner peripheral surface of said operating tube so as to protrude to an inner side in a radial direction, and the leading end portion of the engaging portion of said operating tube is formed as the ratchet gear in said operating tube side.
5. A movable body feeding apparatus as claimed in claim 1 , wherein the ratchet gear in said operating tube side is provided in the leading end surface of said operating tube.
6. A movable body feeding apparatus as claimed in claim 1 , wherein the engaging portion of said operating tube is provided at plural number in the inner peripheral surface of said operating tube so as to protrude to an inner side in a radial direction, and the leading end portion of the engaging portion of said operating tube is formed as the ratchet gear in said operating tube side.