Bolt adapted for one-handed tightening by tightening tool
AssigneesNissan Motor Co., Ltd., Kabushiki Kaisha Sannohashi Seisakusho
InventorYoshio Imai
Life of this patent
Estimating the term…
Abstract
A bolt adapted for use in automated manufacturing line such as automotive vehicle assembly line, can be tightened from one side with a mechanical wrench (16). The bolt has a threaded portion (16) engageable with a nut (18), a pin-tail (18) gripped by the mechanical wrench, and a guide section between the threaded portion and the pin-tail. The guide section has a length (l) determined in relation to the thickness (L) of the nut. The length of the guide section is selected so that approximately the entire length of the pin-tail can protrude from the nut when the nut is preliminarily attached to the bolt with about one turn of rotation.
Claims21
A fastener adapted to be tightened from one side by means of a tightening tool having an inner socket for gripping a one-handed tightening bolt to prevent the bolt from rotating and an outer socket for applying a rotational force to a nut to tighten the nut to the bolt,
- the one-handed tightening bolt comprising:
- a threaded portion engaging an internally threaded nut and extending from a position adjacent a bolt head, said nut having a thickness equal to or greater than the diameter of said bolt;
- a grip portion to be gripped by an inner socket of a tightening tool for preventing rotation, said grip portion being located adjacent the end of said bolt remote from said bolt head;
- a non-threaded, cylindrical guide section interpositioned between said threaded portion and said grip portion and having a given length, whereby approximately the entire length of the grip portion protrudes from the nut when the nut is preliminarily attached with about one-to-two turns of tightening rotation;
- and
- means, formed on said guide section between said threaded portion and said grip portion, for shearing when the tightening torque of the nut reaches a predetermined value in order to hold the nut tightening torque to the predetermined value, said shearing means being located at the end of said guide section adjacent said grip portion.
A one-handed tightening bolt, comprising:
- a bolt head and a shaft extending from said bolt head, said shaft including:
- a threaded portion engaging an internally threaded nut, said nut having a thickness equal to or greater than the diameter of said bolt;
- a grip portion to be gripped by a nut tightening tool, and located adjacent the end of said shaft remote from said bolt head;
- a non-threaded, cylindrical guide section interpositioned between said threaded portion and said grip portion and having a length approximately equal to the thickness of the threaded portion of said nut less the axial length traversed by said nut upon being rotated through one-to-two turns of tightening rotation.
A fastener adapted to be tightened from one side by means of a tightening tool having an inner socket for gripping a one-handed tightening bolt to prevent the bolt from rotating and an outer socket for applying a rotational force to an internally threaded nut to tighten the nut to the bolt,
- the one-handed tightening bolt comprising:
- a bolt head;
- a threaded portion engaging said nut and extending from a position adjacent said bolt head, said nut having a thickness equal to or greater than the diameter of said bolt;
- a grip portion to be gripped by an inner socket of a tightening tool for preventing rotation, said grip portion being located adjacent the end of said bolt remote from said bolt head;
- a non-threaded, cylindrical guide section interposed between said threaded portion and said grip portion and having a length approximately equal to the thickness of the threaded portion of said nut less the axial length traversed by said nut upon being rotated through one-to-two turns of tightening rotation;
- and
- means, formed on said guide section between said threaded portion and said grip portion, for shearing when the tightening torque of the nut reaches a predetermined value in order to hold the nut tightening torque to the predetermined value, said shearing means being located at the end of said guide section opposite said threaded portion.
A one-handed tightening bolt comprising:
- a bolt head and a shaft extending from said bolt head, said shaft including:
- a threaded portion engaging an internally threaded nut, the thickness of said nut being equal to or greater than the diameter of said bolt;
- a grip portion to be gripped by a nut tightening tool, and located adjacent the end of said shaft remote from said bolt head;
- and
- a non-threaded, cylindrical guide section interpositioned between said threaded portion and said grip portion and having a given length, whereby approximately the entire length of the grip portion protrudes from the nut when the nut is preliminarily attached with about one-to-two turns of tightening rotation.
Dependencies are inferred from the claim text.