초록 ▼

The present invention is directed to a method of producing a container for holding a columnar member in a cylindrical housing with a shock absorbent member wrapped around the columnar member. The method comprises the steps of (1) compressing at least a part of the absorbent member wrapped around the

The present invention is directed to a method of producing a container for holding a columnar member in a cylindrical housing with a shock absorbent member wrapped around the columnar member. The method comprises the steps of (1) compressing at least a part of the absorbent member wrapped around the columnar member, by a pushing member in a radial direction toward the longitudinal axis, (2) measuring a pressure applied to the absorbent member by the pushing member, (3) measuring a distance between the axis of the columnar member and an end of the pushing member contacting the absorbent member, when the measured pressure substantially equals a predetermined target pressure, to provide a target radius, (4) inserting the columnar member and the absorbent member into the housing loosely, and (5) reducing a diameter of the housing along its longitudinal axis, with the absorbent member being compressed, to such an extent that the inner radius of the housing substantially equals the target radius, to hold the columnar member and the absorbent member compressed at the target pressure, in the housing.

대표청구항 ▼

1. A method of producing a container for holding a columnar member in a cylindrical housing with a shock absorbent member wrapped around the columnar member, comprising:compressing at least a part of the shock absorbent member wrapped around the columnar member, by a pushing member in a radial direc

1. A method of producing a container for holding a columnar member in a cylindrical housing with a shock absorbent member wrapped around the columnar member, comprising:compressing at least a part of the shock absorbent member wrapped around the columnar member, by a pushing member in a radial direction toward a longitudinal axis of the columnar member;measuring a pressure applied to the shock absorbent member by the pushing member;measuring a distance between the axis of the columnar member and an end of the pushing member contacting the shock absorbent member, when the measured pressure substantially equals a predetermined target pressure, to provide a target radius;inserting the columnar member with the shock absorbent member wrapped around the columnar member, into the cylindrical housing loosely; andreducing a diameter of at least a part of the cylindrical housing with the shock absorbent member held therein along the longitudinal axis of the cylindrical housing, with the shock absorbent member being compressed, to such an extent that the inner radius of the part of the cylindrical housing substantially equals the target radius, to hold the columnar member with the shock absorbent member wrapped around the columnar member and compressed at the target pressure, in the cylindrical housing. 2. The method of claim 1, wherein the target pressure is determined on the basis of a static coefficient of friction of the outer surface of the columnar member, and a static coefficient of friction of the inner surface of the cylindrical housing, and pushing force of the pushing member applied to the shock absorbent member. 3. The method of claim 1, wherein a plurality of pushing members are placed around the periphery of the columnar member in parallel with the longitudinal axis thereof, and wherein at least one of the pushing members compresses the shock absorbent member wrapped around the columnar member in the radial direction toward the longitudinal axis of the columnar member, to measure the pressure applied to the shock absorbent member. 4. The method of claim 3, wherein the plurality of pushing members comprise a plurality of elongated members, each having a length corresponding to the part of the cylindrical housing with the shock absorbent member held therein, and wherein the plurality of elongated members are placed in parallel with one another around the periphery of the shock absorbent member wrapped around the columnar member. 5. The method of claim 4, wherein the columnar member wrapped with the shock absorbent member in an intermediate state thereof between the compressed state by the pushing member and the original state released from the pushing force applied by the pushing member, is inserted into the cylindrical housing. 6. The method of claim 4, wherein the plurality of elongated members placed in parallel with one another around the periphery of the shock absorbent member reduces the diameter of the cylindrical housing with the shock absorbent member held therein, with the shock absorbent member being compressed, to the extent that the inner radius of at least the part of the cylindrical housing substantially equals the target radius. 7. The method of claim 1, wherein a predetermined amount of correction is provided on the basis of at least one of a change in diameter and a change in thickness of the cylindrical housing when the diameter of the cylindrical housing is reduced, and wherein the reducing amount of the cylindrical housing is adjusted according to the amount of correction, when the diameter of the cylindrical housing with the shock absorbent member held therein is reduced. 8. The method of claim 7, wherein the amount of correction is provided by measuring a limit radius of the cylindrical housing, when the shock absorbent member is compressed by the pushing member to such an extent that the inner radius of at least the part of the cylindrical housing is reduced to be less than the target radius and immed iately before the columnar member will be fractured, and setting a predetermined distance less than a difference between the limit radius and the target radius, as the amount of correction. 9. The method of claim 1, further comprising:determining an inner diameter of a final target shape provided for at least an end portion of the cylindrical housing, on the basis of the measured distance between the axis of the columnar member and the end of the pushing member contacting the shock absorbent member, when the measured pressure substantially equals the predetermined target pressure;enlarging the inner diameter of the end portion to form an enlarged diameter portion with a predetermined maximum inner diameter;providing a plurality of target working portions having a central axis with a relationship with one of oblique to, offset from, and skewed from the central axis of a body portion of the cylindrical housing, and extending to an outer peripheral surface of the enlarged diameter portion;providing a plurality of working target axes on the basis of the plurality of target working portions;holding the cylindrical housing to place the central axis of the enlarged diameter portion substantially on the same axis as one of the plurality of working target axes; andspinning at least the enlarged diameter portion, with the central axis of the enlarged diameter portion placed on each of the plurality of working target axes, to reduce a diameter of the enlarged diameter portion at each of the plurality of working target axes, and form a necking portion of the final target shape. 10. The method of claim 9, wherein the necking portion is formed by spinning the body portion from at least an end portion thereof including a predetermined area thereof to an open end of the cylindrical housing, along the working target axis with a relationship with the central axis of the body portion, the relationship being one of oblique to, offset from, and skewed from the central axis. 11. The method of claim 9, wherein the predetermined maximum inner diameter is determined by a distance between the central axis of the body portion and the inner surface of the end portion with the final target shape thereof extending outward of a virtually extending surface from the outer peripheral surface of the body portion. 12. An apparatus for producing a container for holding a columnar member in a cylindrical housing with a shock absorbent member wrapped around the columnar member, comprising:compression means having a plurality of elongated pushing members, each having a length corresponding to at least a part of the cylindrical housing with the shock absorbent member held therein, and being placed in parallel with one another around the periphery of the shock absorbent member wrapped around the columnar member, and compressing at least the part of the shock absorbent member wrapped around the columnar member, by the pushing members in a radial direction toward a longitudinal axis of the columnar member;measurement means for measuring a pressure applied to the shock absorbent member by the pushing members, and measuring a distance between the axis the columnar member and an end of at least one of the pushing members contacting the shock absorbent member, when the measured pressure substantially equals a predetermined target pressure, to provide a target radius; andcontrol means for inserting the columnar member with the shock absorbent member wrapped around the columnar member into the cylindrical housing loosely, and driving the compression means to reduce a diameter of at least the part of the cylindrical housing with the shock absorbent member held therein along the longitudinal axis of the cylindrical housing, by the pushing members, to such an extent that the inner radius of the part of the cylindrical housing substantially equals the target radius, to hold the columnar member with the shock absorbent member wrapped around the columnar member and compressed at th e target pressure in the cylindrical housing. 13. The apparatus of claim 12, wherein the control means is adapted to provide a predetermined amount of correction on the basis of at least one of a change in diameter and a change in thickness of the cylindrical housing when reducing the diameter of the cylindrical housing, and adjust the reducing amount of the cylindrical housing according to the amount of correction, when reducing the diameter of the cylindrical housing with the shock absorbent member held therein. 14. The apparatus of claim 13, wherein the measurement means is adapted to provide the amount of correction by measuring a limit radius of the cylindrical housing, when compressing the shock absorbent member by the pushing members to such an extent that the inner radius of at least the part of the cylindrical housing is reduced to be less than the target radius and immediately before the columnar member will be fractured, and setting a predetermined distance less than a difference between the limit radius and the target radius, as the amount of correction. 15. The apparatus of claim 12, wherein the plurality of elongated pushing members include T-slots. 16. The apparatus of claim 12, wherein the compression means further comprises a cylindrical shrinking device surrounding said plurality of elongated pushing members. 17. The apparatus of claim 12, wherein the apparatus holds a plurality of columnar members in a cylindrical housing with a plurality of shock absorbent members around the columnar members. 18. The apparatus of claim 12, wherein the cylindrical housing includes an overlapped working portion extending beyond an upper and a lower extremity of the columnar member. 19. The apparatus of claim 12, wherein the cylindrical housing includes a plurality of parallel traces.