Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate
2000-02-07
2001-06-19
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Machine
C081S057420
Reexamination Certificate
active
06247384
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fastening device to be used for the fastening work of a rotary member such as for fixing a flywheel to a crankshaft of an engine with a nut.
2. Description of the Prior Art
The fastening device as described above is known. In the Utility Model Publication No. HEI2-12049, a whirl-stop pin is integrally provided with an impact wrench body (case side), and this whirl-stop pin is engaged to a preset hole of a flywheel fitted to the shaft end of a crankshaft to baffle the flywheel. Further, a nut or bolt provided at the tip of a rotary shaft of the impact wrench is fastened to the shaft end of the crankshaft so as to fix the flywheel.
When the system is constituted as above, the fastening work and the whirl-stop work are simultaneously performed with a single device, so that the flywheel which is rotatable in one-piece with the rotary shaft does not need to be whirl-stopped by a detent tool other than the impact wrench. Thus, the device provides excellent workability.
According to the conventional system as above, however, because the whirl-stop pin is fixed to the impact wrench body, the fastening device can not be used when the whirl-stop detaining position changes due to the difference of objects to be fixed, with the result that such device becomes a tool for exclusive use without having universal applicability. Accordingly, the present invention has its object to provide the fastening device with universal applicability so as to be commonly usable for various kinds of objects to be fixed.
SUMMARY OF THE INVENTION
In order to solve the above subject, according to the first aspect of the invention, a fastening device in which a member to be fixed is engaged with a shaft end of a rotary shaft and fixed thereto by a fastener, comprises a fastener driving means having a rotary driving part and a driving body which rotatably supports the rotary driving part, and a whirl-stop jig which is integrally provided with a socket, the whirl-stop jig having a tubular jig body detachably fitted to the driving body and the socket rotatably supported in the tubular jig body, a whirl-stop jig body provided with a whirl-stop for holding the member to be fixed in a non-rotational manner, and the socket cooperatively connected at an end thereof to the rotary driving part to rotate therewith and provided on the other end thereof with a coupling portion for the fastener.
In the second aspect of the invention, the socket is connected to a rotary driving shaft of the rotary driving part through a coupling member. The coupling member and the socket are connected in a manner to be rotatable en bloc and relatively movable in an axial direction, and the socket is forced to project forward by a spring interposed between the coupling member and another end.
In the third aspect of the invention, the whirl-stop jig body is fitted to a jig holder which is previously fitted to the driving body in a freely rotatable manner, and a reaction force receiving part for receiving the reaction force of the fastener driving means is provided on the jig holder.
In the fourth aspect of the invention, the whirl-stop has a pin form which is engaged with an engaging hole provided on the member to be fixed.
In the fifth aspect of the invention, the whirl-stop is formed into a concave part in which a convex part provided on the member to be fixed is engaged.
In the sixth aspect of the invention, the whirl-stop is formed to be engaged with a rib provided on the member to be fixed.
In the seventh aspect of the invention, the whirl-stop is formed into a hollow member in which serration is provided on the inner surface.
According to the invention, because the whirl-stop jig is freely detachable from the fastener drive means, in case of the change of the object to be fixed, it can be replaced with a socket one-piece type jig suitable for the whirl-stop structure, so that the fastening structure suited to universal applicability can be provided.
The socket is connected to the rotary driving part through a coupling member, and the coupling member and the socket are connected in a manner to be rotatable in one-piece and relatively movable in the axial direction and the socket is forced to project forward by the spring. Accordingly, even if the position of the fastener such as a nut or bolt changes during the fastening work, the socket can favorably follow the change. Moreover, as it is possible to meet any change of the axial end position of the rotary shaft which is a subjective part of fastening and universal applicability of use to some extent can be obtained.
The whirl-stop jig body is fitted to the driving body in a freely rotatable manner, and the reaction force receiving part for receiving the reaction force of the fastener driving means is provided on the jig holder. Accordingly, when the reaction force is transmitted to a coupling region between the jig holder and the whirl-stop jig body from the socket at the time of completion of the fastening operation, it can be received there by the reaction force receiving part. When the whirl-stop has the pin form, whirl-stopping may be easily performed through an engaging hole provided on the member to be fixed.
Alternatively when the whirl-stop is formed into the concave part, whirl-stopping may be made easily with respect to the member having the convex part.
When the whirl-stop is formed to be engaged with the rib provided on the member to be fixed, whirl-stop may be easily made with respect to the member having the rib.
Further, in the case where the whirl-stop is formed with the hollow member on the inner surface of which serration is provided, when the member to be fixed has an engageable angular part such as a gear, whirl-stopping may be made by engaging the whole of the member into the hollow part.
REFERENCES:
patent: 2533703 (1950-12-01), Wilhide et al.
patent: 5024565 (1991-06-01), Pinand
patent: 5964128 (1999-10-01), Kaneyama et al.
patent: 5970824 (1999-10-01), Thompson et al.
patent: 1 469 801 (1977-04-01), None
patent: 000 8046 (1983-01-01), None
patent: 2-12049B (1985-05-01), None
Kusu Takuya
Takamura Masahiro
Tokunaga Takahiro
Birch & Stewart Kolasch & Birch, LLP
Honda Giken Kogyo Kabushiki Kaisha
Shakeri Hadi
Smith James G.
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