Insert nut and fastening device
AssigneeCanon Kabushiki Kaisha
InventorsKazushi Kitajima, Hiroshi Hiura, Kazuhisa Okuda
Life of this patent
Estimating the term…
Abstract
An insert nut includes a cylindrical portion into which a bolt is removably insertable. An inner periphery of the cylindrical portion includes a first region, a second region and a third region which are provided in the order named from an upstream side to a downstream side with respect to an insertion direction of the bolt at an inner periphery thereof. The first region and the third region include a female screw portion threadably engageable with the bolt. The second region has a minimum inner diameter larger than D1+2×h1×0.3, where D1 is an inner diameter of the female screw portion in the first region at a screw thread position and h1 is a height of a screw thread of the female screw portion in the first region.
Claims20
An insert nut comprising:
- a cylindrical portion into which a screw is removably insertable;
- a first portion provided in an inner periphery of said cylindrical portion and provided with a female screw portion threadably engageable with the screw, wherein D1 is an inner diameter of the female screw portion in the first portion at a screw thread position and h1 is a height of a screw thread of the female screw portion in the first portion;
- a second portion provided in an inner periphery of said cylindrical portion and disposed in a downstream side of the first portion with respect to an inserting direction of the screw, wherein the second portion has a minimum inner diameter larger than D1+2×h1×0.3;
- and
- a third portion provided in an inner periphery of said cylindrical portion and disposed in the downstream side of the second portion with respect to the inserting direction of the screw, the third portion being provided with a female screw portion threadably engageable with the screw, wherein a minimum inner diameter of the third portion is smaller than that of the second portion.
An insert nut comprising:
- a cylindrical portion into which a screw is removably insertable,
- a first portion provided in an inner periphery of said cylindrical portion and provided with a female screw portion threadably engageable with the screw;
- a second portion provided in an inner periphery of said cylindrical portion and disposed in a downstream side of the first portion with respect to an inserting direction of the screw;
- and
- a third portion provided in an inner periphery of said cylindrical portion and disposed in the downstream side of the second portion with respect to the inserting direction of the screw, the third portion been provided with a female screw portion threadably engageable with the screw, wherein a minimum inner diameter of the second portion is larger than that of the first portion and is larger than that of the third portion.
Dependencies are inferred from the claim text.