JPH04327016A - Nut looseness preventive device - Google Patents

Abstract

PURPOSE:To provide a nut looseness preventive device which does not require a bolt and a nut to be processed specially and is excellent in fitting workability. CONSTITUTION:The whole is formed into one unit by fitting to a support member 2 a bobbin 3 which is provided at its rotation center place with an engagement means 7 engaged attachably/detachably with either of a nut 52 and a bolt 51 and which is to be energized rotatingly in a nut 52 or bolt 51 tightening direction by means of a spring 4, and setting a condition in which spring 4 energy is accumulated, is made possible by equipping a stopper means 5 engaged in linkage and attachably/detachably with the bobbin 3 and the support member 2.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut loosening prevention device in a structure in which members are connected and joined by tightening bolts and nuts.

0002

2. Description of the Related Art In a structure in which members are fastened with bolts and nuts, if the members are wood, the bolts may loosen due to thinning of the wood due to drying, or even if the members are metal, which is not affected by drying. The bolt loosens due to vibration, residual deformation of the bolt shaft after tensile yielding, and the like. In order to prevent this bolt from loosening, it is possible to use a spring washer or a double nut, but these use cannot completely prevent the bolt from loosening and are unreliable.

[0003] Various nut loosening devices have therefore been developed. The first nut loosening prevention device includes a helical spring that is wound around the bolt, one end of which is fixed to the tightening nut, and the other end of which is hooked to a split groove in the bolt head, and the biasing force of the spring is The nut rotates along the bolt in the tightening direction (Japanese Patent Laid-Open No. 56-28
Publication No. 951). In this first nut loosening prevention device, the loosening of the nut is constantly corrected by rotational movement of the nut, so that a desired tightened state can always be obtained.

The second nut loosening prevention device also includes a core fixed to the upper end of the bolt, a rotating body rotatably mounted around the core and engaged with a nut screwed onto the bolt, and a core. and a mainspring spring interposed between the core and the rotating body, an attached holder is used to fix the core to the bolt, and the nut has an engagement hole into which the leg of the rotating body engages. (Unexamined Japanese Patent Publication No. 2-31
018 Publication). According to this second nut loosening prevention device, the spring force of the mainspring spring is transmitted to the nut via the rotating body, and the nut is always urged to rotate in the tightening direction. Therefore, the loosening of the nut is constantly corrected and the desired tightened state can always be obtained.

[0005]

[Problems to be Solved by the Invention] However, in these conventional nut loosening prevention devices, it is necessary to perform special processing on the bolts and nuts, and there is a problem that ordinary bolts and nuts cannot be used as they are, and processing is troublesome. It had a point. That is, the first nut loosening prevention device requires a groove to be formed in the bolt head, and the second nut loosening prevention device fixes the core to the upper end of the bolt.
In addition, it is necessary to drill an engagement hole in the nut.

In addition, with conventional nut loosening prevention devices, the installation of the spring and the application of torque to the spring must be performed at the construction site, and the installation work is performed at each location where the bolt and nut are installed, resulting in poor workability. It was something. That is, in the first nut loosening prevention device, it is necessary to wind a helical spring around the nut at each installation location of the bolt and nut, and fix one end to the nut and the other end to the bolt.
The second nut loosening prevention device is also installed at each installation location.
It is necessary to assemble the core, rotating body, and mainspring. In particular, the second nut loosening prevention device required a large number of parts during construction, making the workability even worse.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a nut loosening prevention device that can be applied to ordinary bolts and nuts that are not subjected to any processing, and that has excellent installation workability. is to provide.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention provides a support member having an attachment portion to an adherend, a bobbin rotatably supported by the support member, and a center of rotation of the bobbin. an engaging means provided at the portion and removably engaged with either the nut or the bolt; a spring that cooperates with the support member and the bobbin and biases the bobbin to rotate in the tightening direction of the nut or the bolt; It is characterized by comprising a stopper means which is detachably connected to the bobbin and the support member and stops the rotation of the bobbin.

[0009]

[Operation] Since the present invention has the above structure, the bobbin,
The mechanism consisting of the engagement means, the spring and the stop means are integrated on the support member, making the whole into one unit. Torque can be applied to the spring by rotating the bobbin, and then the rotation of the bobbin can be stopped by attaching a stopper means to the bobbin and the support member in conjunction with each other, thereby maintaining the state in which torque is accumulated in the spring. can.

[0010] In this state, the unit aligns the engaging portion with the fastened bolt or nut and is fixed to the adherend via the support member, so that the engaging portion engages with the bolt or nut. By removing the stopper means from the fixed unit, the spring biases the bolt or nut to rotate in the tightening direction via the engaging means of the bobbin.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below based on illustrated embodiments. 1 to 4 show a nut loosening prevention device 1 which is an embodiment of the present invention. This loosening prevention device 1 includes a casing 2 as a support member, a bobbin 3 rotatably supported within the casing 2, a constant torque spring 4 as a spring that biases the bobbin 3 to rotate, and a rotation of the bobbin 3. It is generally composed of a split pin 5 as a stopper means for stopping.

The casing 2 includes a surrounding wall 21 formed in a substantially rectangular shape, and plates 22, 2 attached to both sides of the surrounding wall 21.
It is formed into a box body consisting of 3. The plates 22 and 23 are attached to the peripheral wall 21 by screws 24 screwed into four corners of the casing 2. A mounting hole 25 for attaching an adherend is provided in the casing 2 so as to pass through the peripheral wall 21 and the plates 22 and 23. Inside this casing 2 is a bobbin 3.
and an auxiliary bobbin 6 are rotatably attached. Therefore, bearing holes 22a and 2 which rotatably support the bobbin 3 and the auxiliary bobbin 6, respectively, are provided at opposing positions of the plates 22 and 23.
3a, and 22b, 23b are bored.

The bobbin 3 is formed to have a larger diameter than the auxiliary bobbin 6, and the casing 2 is supported by the cylindrical projections 3a, 3b formed to protrude outward on both sides of the rotation center portion and supported by the bearing holes 22a, 23a. It is rotatably mounted inside. A through hole 8 having a square hole 7 at one end is formed at the center of rotation of the bobbin 3. Square hole 7 at this time
is formed into a hexagonal hole corresponding to the outer shape of the nut, and serves as an engagement means that detachably engages with the nut.

Similar to the bobbin 3, the auxiliary bobbin 6 is rotatably mounted inside the casing 2 by having cylindrical projections 6a, 6b formed outwardly projecting from both sides of the rotation center portion supported by bearing holes 22b, 23b. ing.

The constant torque spring 4 is formed by winding a band-shaped plate spring material, and is attached to the auxiliary bobbin 6 at the inner end and hooked to the bobbin 3 at the outer end. For this reason, the auxiliary bobbin 6 and the bobbin 3 are formed with slits 6c and 3c into which the end of the constant torque spring 4 is inserted.
The ends of the spring 4 inserted into the springs c and 3c are fixed by screws 6d and 3d (see FIG. 4). Constant torque spring 4
is wound onto the auxiliary bobbin 6 side when the bobbin 3 is in an unloaded state (free state).

The split pin 5 has a lock hole 9 drilled parallel to the rotation center axis at a position away from the rotation center of the bobbin 3, and an insertion hole 10 drilled in the plates 22 and 23.
and 11 can be inserted into the casing 2 by aligning them. By inserting the split pin 5, the bobbin 3 and the casing 2 are linked together via the split pin 5, as shown in FIG. 3, and the relative rotation of the bobbin 3 with respect to the casing 2 is stopped. This split pin 5 can be easily pulled out, and by pulling it out, the above-mentioned linkage is released and the bobbin 3 becomes free to rotate, and rotates in the biasing direction of the constant torque spring 4.

The nut loosening prevention device 1 constructed as described above operates as follows. Initially, the loosening prevention device 1 is in a state in which the spring 4 is wound onto the auxiliary bobbin 6 side. In this state, a suitable jig is engaged with the square hole 7 and the bobbin 3 is rotated against the spring force of the constant torque spring 4, thereby winding the constant torque spring 4 onto the bobbin 3 side. In this wound state, the split pin 5 is inserted to link the bobbin 3 and the casing 2, and the state in which the torque of the constant torque spring 4 is accumulated can be maintained. In this manner, the loosening prevention device 1 can be set in a state in which the torque of the constant torque spring 4 is accumulated before installation. 1 to 4 show this set state.

Therefore, the loosening prevention device 1 is brought to the site in a set state and installation is completed by simply fixing it to the adherend. This installation will be explained based on FIG. 5. A nut 52 is screwed onto a bolt 51 and attached to the adherend member 50 . In order to apply the loosening prevention device 1 to this nut 52, the square hole 7 may be aligned with the nut 52, and the loosening prevention device 1 may be fixed to the adhered member 50. This fixing is performed by a mounting bolt 53 inserted into the mounting hole 25, and after fixing, the nut 52 is fitted into the square hole 7.

After the split pin 5 is installed, it is removed from the casing 2. By removing the split pin 5, the bobbin 3 becomes free to rotate, and is urged to rotate in the tightening direction of the nut 52 by the spring force of the spring 4. As a result, when the nut 52 becomes loose, the nut 52 is rotated in the tightening direction by the bobbin 3 rotated by the spring force of the constant torque spring 4, and a desired tightened state can always be maintained.

Furthermore, since the constant torque spring 4 is used in this embodiment, the spring force acting on the nut 52 via the bobbin 3, that is, the tightening force, is maintained at a high level without weakening even at the final stage of the stroke. There is an advantage that it can be done.

FIGS. 6 to 9 show another embodiment of a nut loosening prevention device 60. This loosening prevention device 60 differs from the loosening prevention device 1 in that a mainspring spring 40 is used as a biasing means for the bobbin 3, and other structures are generally the same as the loosening prevention device 1. For this reason, the loosening prevention device 60
In the description, the same components as those of the loosening prevention device 1 will be given the same reference numerals, and the description thereof will be omitted.

[0022] The bobbin 3 has a square hole 7 formed at its center of rotation to engage a nut, and is rotatably attached to the casing 2. A peripheral wall 21 of the casing 2 is formed to also serve as a barrel, and a mainspring spring 40 is formed on the peripheral wall 2.
1. The mainspring spring 40 surrounds the bobbin 3 and is attached with its inner end hooked to the bobbin 3 and its outer end hooked to the peripheral wall 21, respectively. Therefore, the bobbin 3 and the peripheral wall 21 have engagement grooves 30a and 2 in which the end of the mainspring spring 40 engages.
1a is formed.

The free state of the loosening prevention device 60 is such that the mainspring spring 40 is separated from the bobbin 3 as shown in FIG. By winding up 40, the set state shown in FIG. 9 is obtained. In this set state, the rotation of the bobbin 3 is stopped by the lock pin 70, and the state in which the spring force of the mainspring spring 40 is accumulated can be maintained.

The loosening prevention device 60 is fixed to the member to be adhered by inserting a nut into the square hole 7 in the set state. After fixing, the bobbin 3 is made free to rotate by removing the lock pin 70, and the spring force of the mainspring spring 40 can be transmitted to the nut via the bobbin 3. The bobbin 3 is urged to rotate in the direction of tightening the nut by the mainspring spring 40, and maintains the nut in the tightened state at all times. In this embodiment, since the mainspring spring 40 is used as the biasing means for the bobbin 3, the auxiliary bobbin 6 of the loosening prevention device 1 described above is unnecessary, which has the advantage of reducing the number of parts.

Furthermore, in both of the above-mentioned loosening prevention devices 1 and 60, the supporting member is the casing 2, and the mechanical part consisting of the bobbin and the spring is built into the casing 2, so that they are not affected by the adverse effects from dust, etc. It looks like this.

[0026] The present invention is not limited to the above-mentioned embodiments, and various modifications such as the following are possible. The support member may be a simple frame body in which the bobbin and the spring that biases the bobbin to rotate are exposed to the outside, and the engagement means may be formed not only in a square hole corresponding to the external shape of the nut but also in the bolt head. It may also be a square column protruding from the center of rotation of the bobbin so as to be able to engage with the square hole. When this prismatic projection forms the engagement means, the bolt is rotationally biased in the tightening direction to prevent the nut from loosening.

[0027]

Effects of the Invention The present invention provides a unit in which a bobbin equipped with means for engaging a nut or bolt and a spring for biasing the bobbin to rotate are integrated into a unit, and the rotational energy of the spring is stored. Installation can be completed by simply bringing the set unit to the site and fixing it to the adherend. This eliminates the need to assemble mechanical parts and apply torque to springs on site, improving work efficiency and preventing incomplete operation when bolts and nuts are not tightened sufficiently on site. It becomes highly reliable. .

[Brief explanation of drawings]

FIG. 1 is a front view of a nut loosening prevention device of the present invention.

FIG. 2 is a side view taken in the direction of the X arrow in FIG. 1;

FIG. 3 is a sectional view taken along line AA in FIG. 1;

FIG. 4 is a sectional view taken along line BB in FIG. 2;

FIG. 5 is a sectional view illustrating the operation of the present invention.

FIG. 6 is a front view of another nut loosening prevention device of the present invention.

7 is a cross-sectional view taken along the line AA in FIG. 6. FIG.

8 is a cross-sectional view of the nut loosening prevention device of FIG. 6 in a free state; FIG.

9 is a cross-sectional view of the nut loosening prevention device of FIG. 6 in a set state; FIG.

[Explanation of symbols]

1,60 Nut loosening prevention device 2 Casing (supporting member) 3 Bobbin 4 Constant torque spring (spring) 5 Split pin (stopper means) 7 Square hole (engaging means) 40 Main spring (spring) 50 Attached member 51 Bolt 52 Nut 70 Lock pin (stopper means)

Claims (1)

[Claims] Claim 1: A support member having an attachment portion to a member to be adhered to, a bobbin rotatably supported by the support member, and a bobbin provided at the center of rotation of the bobbin and capable of being attached to or detached from one of a nut and a bolt. a spring that is coupled to the support member and the bobbin and urges the bobbin to rotate in the direction of tightening the nut or bolt; and a spring that is detachably coupled to the bobbin and the support member to rotate the bobbin. A nut loosening prevention device comprising a stopper means for stopping the loosening of a nut.