JP3553290B2 - Cap for preventing falling off and female screw member for preventing falling off including the cap - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for fastening a material to be fastened by a female screw member.
[0002]
[Prior art]
Conventionally, when bolts and nuts are used for fastening a male screw member and a female screw member, for example, for joining plates or mounting an instrument, a material to be fastened such as a plate (hereinafter referred to as a bolt and nut) is used. the shall called "the fastening material".) open the appropriate bolt holes in which the saw insertion of appropriate diameter and length of the bolt, tighten screwed with a nut. In this case, the bolt and the nut are, for example, applied to the tip of the bolt exposed from the bolt hole opening, and holding the nut with one hand or a tool such as a hexagon wrench, and fixing the bolt head with a tool such as a hexagon wrench. Rotate and screw. During screwed in this way, usually, the nut must be held with one hand, otherwise, nut fall off.
[0003]
However, holding the nut with one hand and tightening a bolt or the like with a tool with the other hand is inferior in workability. In particular, when it is not easy to put a hand on the back side of the material to be fastened, the work efficiency is further reduced. This is a problem common not only to bolts and nuts but also to the case where another male screw member and a female screw member are screwed together.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to hold and fix a female screw member before screwing to a material to be fastened without falling off, so that a male screw member can be screwed to the female screw member without supporting the female screw member with one hand. Is to do.
[0005]
[Means for Solving the Problems and Functions / Effects]
SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problem is directed to a drop-off preventing member for holding a female screw member on the inner peripheral surface of a male screw hole of a material to be fastened. Portion and a first holding portion that fits in the male screw hole of the material to be fastened are formed integrally, and the female screw member before screwing held by the falling-off preventing member at the second holding portion is the A clearance is provided between the outer diameter of the male screw member inserted into the male screw hole of the material to be fastened and the inner diameter of the first holding portion, while being held in the male screw hole of the material to be tightened by the one holding portion. The male screw member is screwed to the female screw member through, and the falling-off prevention member is provided with a flange portion between the female screw member and the material to be fastened so as to expand outward from the first holding portion, entire stopper member including the first holding portion and the flange portion which the contact with the fastening member , Characterized by being formed of a material fall off and the friction coefficient resulting in frictional force of about preventing or inhibiting the co-rotation during the screwing between the female screw member and the externally threaded member from the fastening member.
[0006]
That is, as shown in FIGS. 3, 5 and 6 , with the female screw member held by the second holding portion of the falling-off prevention member , the first holding portion is fitted into the male screw hole of the material to be fastened. By fixing the female screw member before screwing, the screw hole of the female screw member before screwing is held so as to face the male screw hole of the material to be fastened, even if the female screw member before screwing is not supported by hand or the like. The male screw member can be screwed. Therefore, one hand is free, and the tightening operation is facilitated.
Further, to form a clearance between the outer diameter of the external thread member to be inserted into the inner diameter and the male screw hole of the fastening member of this dehydration drop preventing member, also internally threaded so as to extend outwardly from the first holding portion A flange portion is provided between the member and the material to be fastened, and the entire cap including the first holding portion and the flange portion that is in contact with the material to be fastened, falls off from the material to be fastened, and a bolt. By using a material having a coefficient of friction that generates a frictional force to prevent or suppress swirling of the female screw member, it was possible to prevent the female screw member from rotating together with the male screw member.
[0007]
Specifically, the first holding portion is formed of a flat cylindrical body that comes into contact with the inner peripheral surface of the male screw hole of the material to be fastened, and the second holding portion extends outward from the first holding portion. It is formed of a flat cylindrical wall that rises from the outer peripheral edge of the flange portion formed so as to extend to the opposite side of the male screw hole, and includes a first holding portion, a second holding portion, and a flange portion. The falling-off preventing member may be formed integrally, and this falling-off preventing member can be handled as one nut with the second holding portion fitted to the female screw member.
[0008]
The shape of the first holding portion in the stopper member can be set to a shape of a slit in ones of a barrel shape, for example. With this configuration, even when the diameter of the male screw hole formed in the material to be fastened is slightly larger, the first holding portion of the falling-off prevention member is in close contact with the inner peripheral surface of the male screw hole, and a stable holding state is obtained. Is obtained.
[0009]
Also, the a stopper member configured as a drop-off prevention cap, if the drop-off prevention cap and the female screw member This is a pre-fall preventing female screw member without an integral, drop-off prevention cap when using internally threaded member The work of assembling is eliminated and the handling becomes easier.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to examples shown in the drawings.
In Fig 1 showing an embodiment of the stopper member, the falling-off prevention cap C1 constituting the stopper member (hereinafter, referred to cap C1) is made by machining such as metal, also, as another method It is formed by injection molding of a synthetic resin. The cap C1 is finished as a relatively thin flange member, and has a small-diameter flat cylindrical bolt hole insertion portion 1 (first holding portion) and a larger-diameter flat-bottomed flat cylindrical nut holding portion. A part 2 (second holding part) is provided concentrically and integrally.
[0011]
The inside of the bolt hole insertion portion 1 becomes a bolt hole 5, and the diameter of the bolt hole 5 is obtained by adding a slight clearance to the thread diameter of the bolt in order to avoid contact with the bolt passing therethrough. When the cylindrical outer peripheral surface 1a of the bolt hole insertion portion 1 is fitted into the bolt hole 11 of the material to be tightened W shown in FIG. The outer diameter and height t1 (FIG. 1 (b)) are determined so as to generate a frictional force that prevents or suppresses rotation.
In addition, from the viewpoint of preventing such drop-off and entrainment, the entire cap C1 is made of a material having a high friction coefficient, or the surface roughness of the outer peripheral surface 1a of the bolt hole insertion portion 1 is increased, or It is also effective to provide irregularities on the outer peripheral surface 1a.
[0012]
As shown in FIG. 1 (b), the nut holding portion 2 includes a circular flange portion 3 formed on the outer peripheral edge of one end of the bolt hole insertion portion 1 so as to expand laterally, and an outer peripheral edge of the flange portion 3. And a flat cylindrical wall portion 4 which stands up integrally. In other words, it can be said that the flange portion 3 forms the bottom of the nut holding portion 2. As shown in FIG. 2 (b), the wall portion 4 has an inside diameter into which the circular seat portion 6 of the nut N is just fitted, and while the nut N is sufficiently held, the use of a tool such as a wrench is not hindered. The depth t2 (FIG. 1 (b)) is made substantially equal to the thickness of the seat 6 so as not to occur.
[0013]
FIG. 2 shows an embodiment of a captive female screw member in which the cap C1 of FIG. 1 and a nut N with a circular seat are joined and integrated. The cap C1 task Ru obtain the captive nuts A1 constituting the captive female screw member Nde write fitted to the nut N as falling prevention nut A1 in worker fitted just prior to use to prepare a two component separately Although it can be used, the fitting operation can be performed at a factory by an automatic assembling machine at the time of manufacturing the cap C1, and the cap C1 can be shipped as a fall-off prevention nut A1.
In the latter case, in order to omit the fitting step, it is possible to insert and integrate the nut N at the time of the injection molding of the cap C1. There is welding and the like.
[0014]
As shown in FIG. 3A, when a bolt is screwed into the fall-off prevention nut A1, the bolt hole insertion portion 1 of the cap C1 in which the nut N is fitted is inserted into either the tightened material Wa or Wb. purchase against the opening of the bolt holes 11, insertion No to the flange portion 3 abuts against the outer surface 13 of the fastening member Wa. As a result, the cap C1 with the nut N is in close contact with the inner peripheral surface 12 of the material Wa to be fastened over the entire outer peripheral surface 1a. do not do.
In this state, if the bolt B is screwed in as shown in FIG. 3B, the nut N and the bolt B can be easily screwed together without supporting the nut N with one hand. FIG. 3C shows the tightening completed state.
[0015]
If there are many bolts and nuts to be tightened, the work of inserting the captive nuts A1 should be performed first, and the work of tightening the bolts should be performed later. The efficiency of the setting work and the tightening work can be improved.
[0016]
The embodiment of the cap C4 for preventing falling off shown in FIG. 4 has a barrel-shaped outer peripheral surface bulging outward as a first holding portion, and the entire circumference of the barrel-shaped tube is substantially aligned with the axial direction of the bolt hole. It has a barrel-shaped bolt hole insertion part 41 with a slit provided with a parallel slit 42. By providing the slit 42, the barrel-shaped bolt hole insertion portion 41 is easily elastically deformed inward. Accordingly, the maximum diameter portion of the barrel-shaped bolt hole insertion portion 41 is formed to be larger than the inner diameter of the bolt hole 11, and the maximum diameter portion is pushed into the bolt hole 11 while being elastically reduced in diameter, thereby increasing the holding force. Can be.
[0017]
In the embodiment of the cap C5 for preventing falling off shown in FIG. 5 , a snap-fit type bolt hole insertion portion 51 is formed as a first holding portion by forming a plurality of slits 52 in a cylindrical portion to form a plurality of engagement claws 53. Is provided. A locking projection 54 projecting outward is formed at the tip of each engaging claw 53, and a step 55 is formed on the inner peripheral surface 12 of the bolt hole 11. The cap C5 holding the nut N is prevented from slipping out by engaging the locking projection 54 with the step 55 after the plurality of engaging claws 53 elastically reduce the diameter and enter the bolt hole 11 and then expanding. Is done.
[0018]
In the embodiment of the cap C6 for preventing falling off shown in FIG. 6 , the nut holding portion 61 as the second holding portion is tightly fitted and fitted to the end inner peripheral surface 62 where the screw of the nut N is not formed. And integrated. The inner peripheral surface 62 of the end is larger than the inner diameter of the female screw hole of the nut N and is formed so as to sit on the end of the nut. The cap C6 according to the present embodiment can be used in common even if the nuts to be used have various outer edge shapes (for example, hexagonal or circular) and sizes, as long as the hole diameter of the end inner peripheral surface 62 is the same. Having.
[0019]
As in the embodiment shown in FIG. 7 , a bolt hole insertion portion 81 as a first holding portion or a nut holding portion as a second holding portion is provided with a bolt hole insertion portion 81 formed of arc-shaped projections at predetermined intervals or a nut holding portion. may be a part 86, as further shown in FIG. 8, it may be a nut holding portion 91 of the same hexagonal shape of the nut.
[0020]
Further, the present invention is not limited to the nut. For example, as in the embodiment shown in FIG. 9 , when a small piece 96 (female screw member) having a plurality of female screw holes 95 is bolted to the material W to be fixed, another female screw may be used. It can also be applied to members.
In addition, it goes without saying that the present invention can be carried out in various modified forms based on the knowledge of those skilled in the art.
[Brief description of the drawings]
Shows the captive cap of the embodiment of the present invention; FIG.
FIG. 2 is a diagram of Example dropout-preventing cap of Figure 1 showing the captive female screw member that is integrated with the female screw member.
FIG. 3 is an operation explanatory view showing stepwise a threaded state of a falling-off prevention internal thread member and a male thread member formed by bolts.
FIG. 4 shows the captive cap in other embodiments.
5 is a sectional view showing a tightened state captive female screw member according to another embodiment.
6 is a sectional view showing a tightened state captive female screw member according to another embodiment.
FIG. 7 is a perspective view showing a case where a bolt hole insertion portion or a nut holding portion of the cap for preventing falling off is an arc-shaped projection.
FIG. 8 is a perspective view showing a case where the nut holding portion of the cap for preventing falling off is hexagonal.
FIG. 9 is a cross-sectional view showing an example in which a female screw member different from a nut is combined with the cap for preventing falling off of the embodiment of FIG. 6;
[Explanation of symbols]
1 Bolt hole insertion part (first holding part)
2 Nut holding part (second holding part)
3 Flange part 4 Wall part 5 Bolt hole 11 Bolt hole (male screw hole)
12 Inner peripheral surface B bolt (male screw member)
N nut (female screw member)
W material to be fastened

Claims (4)

In a fall-off prevention member for holding the female screw member on the inner peripheral surface of the male screw hole of the material to be fastened,
A second holding portion that holds the female screw member and a first holding portion that fits into the male screw hole of the material to be fastened are integrally formed on the falling-off prevention member ,
The female screw member before screwing held by the falling-off prevention member in the second holding portion is held in the male screw hole of the material to be fastened by the first holding portion,
Between the outer diameter of the male screw member to be inserted into the male screw hole of the tightened member and the inner diameter of the first holding portion, the male screw member is screwed to the female screw member via a clearance,
The fall-off prevention member is provided with a flange portion between the female screw member and the material to be fastened so as to expand outward from the first holding portion,
The entirety of the fall-prevention member including the first holding portion and the flange portion in contact with the material to be fastened is prevented from falling off from the material to be fastened , or preventing the female screw member and the male screw member from rotating together when screwed. A cap for preventing falling off, wherein the cap is made of a material having a coefficient of friction that produces a reduced frictional force. The first holding portion is formed of a flat cylindrical body that contacts the inner peripheral surface of the male screw hole of the material to be fastened,
The second holding portion is formed of a flat cylindrical wall portion rising from the outer peripheral edge of the flange portion formed to extend outward from the first holding portion toward the opposite side of the male screw hole,
2. The cap according to claim 1, wherein the falling-off preventing member formed of a first holding portion, a second holding portion, and a flange portion is integrally formed. The outer peripheral surface of the first holding portion forms a barrel-shaped outer peripheral surface bulging outward, and a plurality of slits are formed in the entire periphery of the first holding portion having the barrel-shaped outer peripheral surface in parallel to the axial direction of the male screw hole. The cap for preventing falling off according to claim 1 or 2, wherein the cap is formed. The female screw member has a cap for preventing the female screw member from falling off in the male screw hole of the material to be fastened,
  The cap for preventing falling off is a second holding portion comprising a flange portion which is in close contact with the surface of the female screw member on the side of the material to be fastened, and a flat cylindrical wall portion which rises from the outer peripheral edge of the flange portion on the outer circumference of the female screw member. And the second holding portion is located on the outer periphery of the female screw member, and the female screw member and the cap for preventing falling off are united,
  The cap for dropping-off is provided with a first holding portion that fits with the inner peripheral surface of the male screw hole of the material to be fastened and holds the female screw member before screwing in the male screw hole of the material to be fastened. The cap for preventing falling off is integrally formed of a material having a coefficient of friction that generates a frictional force that prevents or suppresses co-rotation at the time of screwing the female screw member and the male screw member, and is inserted into the male screw hole of the member to be fastened. Having a clearance between the outer diameter of the externally threaded member and the inner diameter of the first holding portion of the cap for preventing falling off,
  A drop-off including a drop-off prevention cap, which prevents or suppresses the female screw member from falling off from the male screw hole of the material to be fastened and the co-rotation of the female screw member at the time of screwing the female screw member and the male screw member. Prevent internal thread member.

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