JPS6242165B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention utilizes the principles of wheel gears and worm gears to tighten bolts or nuts with a small torque and with a detent effect.

Conventional technology In the past, it was common to directly tighten the head or nut of a bolt or nut using a tool such as a spanner, but this required force, and in order to prevent it from returning, it was necessary to tighten the friction force of the seat surface. A good tightening force is required, and although high tension bolts and other various measures have been taken, they have not been perfect.

Problems to be Solved by the Invention That is, in this invention, a thin flange is provided around the bolt head or nut, a foil gear is cut on the periphery, and the worm gear attached to the washer side is tightened by hand or with an L-shaped tool. By tightening, the tightening force can be easily increased and the detent effect is perfected.

Means for Achieving the Problem In order to rotate the wheel gear by turning the worm gear, it is necessary to prevent the worm gear from rotating due to the reaction force.Therefore, a serration is provided on the back side of the washer on the bearing side of the worm gear. As the bolt is tightened and moved, the washer is fixed to the frame plate.

In other words, when first inserting the bolt, the washer is turned by hand, etc., and when torque is applied, the worm gear is turned to tighten it, but at the same time,
The bolt head or nut seat presses the back of the washer against the frame plate surface, and its serrations gradually eliminate the movement of the worm, making it possible to turn the wheel gear to the appropriate torque, and the worm also acts as a detent. be.

Example Thin flange 2 is attached to the circumference of a bolt 1 whose head is circular.
A wheel gear 3 having an appropriate tooth profile is cut into the wheel gear 3, and a bearing part 6,
6 is stood up, shaft holes 7, 7 are provided in it, and a worm gear 8 is designed and attached to the position where it meshes with the wheel gear 3. The end of the worm gear 8 is provided with a wing portion 9 and designed to be turned by fingers or provided with a hexagonal hole 10 and tightened with an L-shaped tool. Serration 1 is on the back of Washi 4.
1 is provided by press forging etc. to prevent the washer 4 from rotating, but if we assume that the bolt is to be implanted and fixed, the back side of the bolt head will press against the frame plate surface 12 until the washer 4 is pressed. The bolt 1 and the washer 4 are screwed together in advance, and from the time when they are pressed together, the wing section 9 or the hexagonal hole 10 is turned manually or with a tool, respectively, until the final tightening. As the washer 4 rotates, it bites into the frame plate surface and the wheel gear 3 on the bolt head rotates more than the worm gear 8 without the washer 4 rotating. At this time, the bolt head slides on the upper surface of the washer, exerts more pressure on the washer 4, and generates high torque at that gear ratio, and also serves as a detent. Furthermore, if necessary, a retaining plug 13 with a leaf spring that fits into the hexagonal hole 10 of the worm gear 8 can be provided to provide a light-load detent, making it even safer. In addition, when tightening a nut, it is sufficient to design it in the same way as the bolt head, and in that case, the washer can be used with the same specifications.

Effects of the Invention As described above, the present invention uses a worm wheel mechanism to increase the tightening force with the reduction ratio of the gear and also has a detent effect, thereby providing a small torque manual tightening mechanism.
Alternatively, a light load detent mechanism can be adopted, and the worm gear attachment part can be positioned in any space on the bolt head during use, making it possible to use it even in narrow tightening spaces. Further, when the molded cap 14 with wheel gear is used as an attachment, it can be used for general purposes such as conventional bolts, etc. It can also be constructed as a closed type as shown in FIG. 4 and can be conveniently used in conventional locations.

[Brief explanation of the drawing]

Fig. 1 is a side view of the bolt head of the present invention during crimping and tightening; Fig. 2 is a perspective view of the bolt head when used in a nut;
FIG. 3 is a perspective view showing the back side of the washer;
FIG. 4 is a perspective view of a closed type detent plug according to the present invention, and FIG. 5 is a molded cap with a wheel gear. DESCRIPTION OF SYMBOLS 1... Bolt, 2... Flange, 3... Wheel gear, 4... Washer, 5... Outward protrusion, 6...
Bearing part, 7... Shaft hole, 8... Worm gear, 9
... wing section, 10 ... hexagonal hole, 11 ... serration, 12 ... frame plate surface, 13 ... stop plug with leaf spring, 14 ... molded cap with wheel gear.

Claims (1)

[Claims] 1 A wheel gear is cut around the bolt head or nut, and the worm gear that meshes with this is made by protruding a part of the washer with serrations on the back side and providing a rising part, which bears the worm gear and lowers the worm gear. A tightening bolt using a worm gear that uses torque rotation to screw in the bolt or nut with high torque, thereby crimping and fixing the serrations to the frame plate surface.