JPS6149527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a fastening tool that utilizes tightening means for threaded parts using bolts. The screws can be easily screwed in, and the screws can be easily turned and removed without causing difficulty in loosening the screws due to vibrations that may cause the screws to become too tight after tightening. To provide a fixing tool that prevents a lever from rising up by itself and a screw from unintentionally loosening even when vibration is applied.

In order to achieve the above-mentioned object, the present invention includes a lever that is movably attached to the head of a bolt with a threaded portion for fixing at the lower part thereof by means of a pivot shaft for manual screwing. The outer periphery of the end of the lever is formed by a cam-shaped surface, and this cam-shaped surface is configured to protrude from the lower surface of the bolt head, and when the bolt is screwed in, the cam-shaped surface is applied to the object to be fixed. This contact maintains the fixed state of the screw by tightening the screw, and provides the effect of preventing over-tightening of the screw and inadvertent lifting of the lever.

The structure and operation of the present invention will be explained below with reference to the drawings, but those having the essential constituent features of the present invention described in the claims of this specification will be described in this specification, for example, in their embodiments. Even if there are differences from the described embodiments, they still fall within the technical scope of this invention.
Needless to say.

In FIGS. 1 and 2, 1 is a threaded portion of bolt A, which is a part of the main components of the tightening bolt of the present invention, which is a fastening tool, and threaded portion 1 shown in FIG. 2 is a threaded portion of bolt A. The threaded portion 1 shown in FIG. 2 has a male screw threaded around the outer periphery of the bolt A. 2 is a bolt head that is integrated with the threaded part 1, and this bolt head 2 is larger than the threaded part 1 and has a hexagonal planar shape, similar to the head of a normal bolt, to match the jaws of a spanner, which is a general-purpose tightening tool. It has a thickness D. Reference numeral 3 denotes a support shaft provided on the bolt head 2, and its central axis E is orthogonal to the central axis F of the threaded portion 1 of the bolt A. B is a lever that is pivotally supported on the bolt head 2 by the above-mentioned support shaft 3, and when the lever B is near the support shaft 3, the lever B is bifurcated 5.
The bolts are each pivotally supported on the side of the bolt head 2 by a support shaft 3. The support shaft 3 may be a single shaft passing through the bolt head 2, or both of the two forks may be supported by separate short shafts on the sides of the bolt head 2. It doesn't make any difference.
Furthermore, the grip portion 6 on the opposite side of the bifurcated portion of the lever B has a thick structure so that it is convenient for a person to tighten or loosen a screw by holding it by hand, and has more weight than the bifurcated portion. Lever B is made of metal or a polymeric synthetic resin for plastic engineering, which has the same wear resistance as metal.
In the latter case, a metal weight may be buried in the grip portion, and the metal grip portion 6 may also be covered with a synthetic resin skin. In addition, although the lever B has a grip portion 6 formed by members a and b, each of which is a bifurcated extension, and a member c sandwiched between them, it goes without saying that these may be integrated. Further, the head 2 of the bolt is not limited to the usual hexagonal shape, but may be a regular square, a rectangle, or a round shape, as long as there is no difference in the support of the support shaft 3, there is no need to specify the shape. . Next, in FIGS. 1 to 3, reference numeral 7 denotes a cam-shaped surface for tightening adjustment provided on the outer periphery of the end of the lever B, which is rotatably supported on the bolt head 2 by a support shaft 3. It is essential that the surface 7 is provided so as to protrude from the lower surface C of the bolt head 2 by an appropriate dimension G.
The cam-like surface 7 shown in FIGS. 1 to 3a is formed into a concentric short cylindrical shape with the center line E of the shaft 3 as the axis, and the cam-like surface 7 shown in FIG. The radii of curvature of the shapes are sequentially different. Even in the case of the above-mentioned short cylinders, even if they have shapes with different radii of curvature, they do not necessarily need to be concentric with the axis 3,
In short, as long as the cam-shaped surface protrudes from the lower surface C of the bolt head 2 by an appropriate dimension G, the main object of the present invention can be fully satisfied.
Furthermore, providing the cam-shaped surface on both sides of the fork 5 as shown in Fig. 1 is merely a matter of design, and if there is no practical problem, it may be provided on only one side of the fork 5, and of course one of the forks 5 is unnecessary. There may also be a design that does this.

By the way, in the case of Fig. 3b, the central axis E of the support shaft 3
The plane _L1 passing through the center of lever B is the cam surface 7.
The radius of curvature of the cam at the point M where it intersects _{is 1} (first
The plane L ₂ that includes the central axis F of the bolt A and the central axis E of the support shaft 3 perpendicular to this is the cam 7.
Slightly from the point N where it intersects (5 degrees as a guide)
The radius of curvature of the cam 7 at the point P (referring to a position 60 degrees from the plane L ₁ ) that is biased toward M by ₂
(referred to as the second radius) is the maximum radius of curvature of the cam 7, and the radius of curvature increases by ₂ - ₁ during the interval S of the cam surface 7 between M and P, passing the point P and moving in the opposite direction to the point M. The radius of curvature of the cam surface 7 gradually returns to the first radius ₁ as it goes, and one end surface of the cam surface 7 ends at a position Q, which is approximately 45 degrees from the point P. In addition, the cam surface 7 in the opposite direction from the point M to the point P has the first position within a range of 75 degrees.
It consists of a radius of ₁ and ends at a position R.

The fixing tool of the present invention has the above-mentioned configuration, and when it is applied to a well-known parts feeder as an example, its usage and action will be explained as follows. In Figure 4, 8 is the base of the parts feeder, and 9 is the bowl of the parts feeder screwed onto the base 8 using the fixing tool of the present invention, and a threaded parts supply gutter is provided on the inner periphery of the bowl. The parts placed in the container are forcibly vibrated by a vibrating device 10 built in the lower part, so that the parts are guided into the gutter, aligned, and then supplied to the required equipment.

The following Figures 5 and 6 are enlarged front views, partially in section, showing the state in which the bowl 9 of the parts feeder shown in Figure 4 is fixed to the base 8 using the tightening adjustment bolt of the present invention. Fig. 5 shows the state before bolt A is completely tightened, and Fig. 6 shows the state before bolt A is completely tightened.
It is shown in a completely closed state. bowl 9
To fix it to the base 8, as shown in Fig. 5, with the lever B tilted with respect to the center axis F of the bolt A, turn the lever B clockwise to tighten it so that it is lower than the bottom surface C of the bolt A. Tightening is completed when the protruding cam-shaped surface 7 comes into contact with the washer 11.
In a parts feeder, the bolt A tends to tighten automatically due to vibrations during work, but if the tightening adjustment bolt of the present invention is used, the cam-shaped surface 7 and the washer 11 will be in a substantially linear shape when tightened. Lever B must be in contact with head 2 of bolt A in a narrow area.
The bowl 9 can be removed by rotating the bolt counterclockwise with relatively light manual force without having to pivot the bowl 9.

FIGS. 7a and 7b are action explanatory diagrams explaining the second embodiment. In FIG. It contacts the washer 11 at a point P having the maximum radius of curvature. This point P effectively prevents the lever B from rising due to the vibration of the parts feeder, which is located slightly deviated from N to M as described above. Next, when loosening the bolt A, it is sufficient to raise the lever B until the plane _L1 passing through the center of the lever B coincides with the central axis F of the bolt, as shown in FIG. 7b. At this time the 7th
As shown in Figure b, a gap d of _2-1 is created between the lower surface of the cam-shaped surface 7 and the upper surface of the washer ₁₁ . Therefore, the bolt can be loosened immediately by rotating the lever B counterclockwise about the central axis F of the bolt.

The present invention has the above-described structure and operation. A lever is supported by a spindle on the head of a bolt having a threaded portion so that it can be raised and lowered freely. The radius of curvature from the axis of the cam-shaped surface is set to a size that allows the cam-shaped surface to protrude from the bottom surface of the bolt head, making it easy to tighten the screw.
No special tools are required for removal, and even if the screw becomes overtightened due to vibration after tightening, the bolt can be easily loosened by turning the screw.

Further, in the second embodiment, since the radius of curvature of the cam-shaped surface is sequentially changed, it is possible to prevent the lever from rising by itself, and it is possible to loosen the screw more easily. .

As described above, when the tightening adjustment bolt, which is a fastening tool of the present invention, is used in many fastening fields where it is required, it is a truly excellent invention in that it can be expected to make a great contribution to improving the efficiency of various tasks and reducing labor at the site where it is used. It can be said that.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the tightening adjustment bolt of the present invention, Fig. 2 is a front view thereof, Fig. 3a is a front view showing an enlarged part of the tightening adjustment bolt in Fig. 2, and Fig. 3b is a front view similar to a showing the second embodiment,
Fig. 4 is a perspective view showing the state in which the tightening adjustment bolt of the present invention is used in a parts feeder, and Fig. 5 is an enlarged front view showing a part of the parts feeder in section before the tightening adjustment bolt is tightened. , FIG. 6 is an enlarged front view showing the state in which the tightening adjustment bolt is completely tightened, and FIGS. 7a and 7b are explanatory diagrams showing the operating state of the second embodiment. A... Bolt, B... Lever, C... Lower surface (of bolt head), 1... Threaded part, 2... Bolt head, 3... Support shaft, 7... Cam-shaped surface.

Claims (1)

[Scope of Claims] 1. The end of a lever B is pivotally supported by a support shaft 3 on the head 2 of a bolt A, which has a threaded portion 1 for fixing at the lower part thereof, so that the lever B can be raised and lowered freely. A tightening adjustment bolt for fastening, in which the outer periphery of the end portion is formed by a cam-shaped surface 7, and this cam-shaped surface is provided to protrude from the lower surface C of the bolt head 2. 2. The fixing tightening adjustment bolt as set forth in claim 1, wherein the cam-shaped surface C has a shape in which the radius of curvature around the axis E of the support shaft 3 is sequentially different. 3. The contact area P of the cam-shaped surface 7 with the object to be fixed is aligned with the center of the lever B with respect to the plane _L2 including the central axis F of the threaded portion of the bolt A and the central axis E of the support shaft 3 perpendicular to this. The fixing tightening adjustment bolt according to claim 2 is arranged with a slight deviation in the direction of the point M where the plane _L1 passing through intersects the cam-shaped surface C.