Tunnel device
AssigneeHi-Lex Corporation
InventorShinsaku Koarashi
Life of this patent
Estimating the term…
Abstract
A tunnel device includes a base portion, a shaft to be connected to the base portion at one end of the shaft, and a tip portion to be connected to another end of shaft. The base portion is provided with a shaft connection portion to which the one end of shaft is connected. The shaft is provided with a shaft-side screw portion at the one end of the shaft. The shaft connection portion includes a shaft housing portion having an inner diameter substantially same as an outer diameter of the one end of the shaft, and a base-portion side screw portion provided on a further inner side relative to the shaft housing portion. The base portion and the shaft are fixed to each other by screwing between the shaft-side screw portion and the base-portion side screw portion.
Claims3
A tunnel device, comprising:
- a base portion;
- a shaft connected to the base portion at one end of the shaft, the one end of the shaft being a cylindrically shaped end;
- and
- a tip portion connected to another end of the shaft, wherein
- the base portion is provided with a shaft connection portion to which the cylindrically shaped end of the shaft is connected,
- the shaft is provided with a shaft-side screw portion having a female screw portion on an inner peripheral surface of the cylindrically shaped end of the shaft,
- the shaft connection portion includes:
- a shaft housing portion having an inner diameter substantially same as an outer diameter of the cylindrically shaped end of the shaft;
- and
- a base-portion-side screw portion having a male screw portion provided on a further inner side relative to the shaft housing portion,
- the base portion and the shaft are fixed to each other by screwing between the shaft-side screw portion and the base-portion-side screw portion,
- the tunnel device further comprises:
- a base-portion-side tapered portion provided in a depth-side wall portion of the shaft housing portion in an insertion direction of the shaft;
- and
- a shaft-side tapered portion provided in an end edge of the cylindrically shaped end of the shaft such that the shaft-side tapered portion is connected in a tapered manner with and has surface contact with the base-portion-side tapered portion when the base portion and the shaft are fixed to each other,
- the base-portion-side tapered portion includes a first tapered portion and a second tapered portion which are inclined in an axial direction of the base portion,
- the first tapered portion and the second tapered portion are provided so as to intersect with each other in the axial direction, and
- the first tapered portion and the second tapered portion are provided such that a taper angle of the first tapered portion with respect to the axial direction is greater than a taper angle of the second tapered portion with respect to the axial direction.
A tunnel device, comprising:
- a base portion;
- a shaft connected to the base portion at one end of the shaft;
- and
- a tip portion connected to another end of the shaft, wherein
- the base portion is provided with a shaft connection portion to which the one end of the shaft is connected,
- the shaft is provided with a shaft-side screw portion at the one end of the shaft,
- the shaft connection portion includes:
- a shaft housing portion having an inner diameter substantially same as an outer diameter of the one end of the shaft;
- and
- a base-portion-side screw portion provided on a further inner side relative to the shaft housing portion,
- the base portion and the shaft are fixed to each other by screwing between the shaft-side screw portion and the base-portion-side screw portion,
- the tunnel device further comprises:
- a base-portion-side tapered portion provided in the shaft housing portion;
- and
- a shaft-side tapered portion connectable in a tapered manner with the base-portion-side tapered portion, the shaft-side tapered portion being provided in the one end of the shaft,
- the base-portion-side tapered portion includes a first tapered portion and a second tapered portion which are inclined in an axial direction of the base portion,
- the first tapered portion and the second tapered portion are provided so as to intersect with each other in the axial direction, and
- the first tapered portion and the second tapered portion are provided such that a taper angle of the first tapered portion with respect to the axial direction is greater than a taper angle of the second tapered portion with respect to the axial direction.
Dependencies are inferred from the claim text.