JP3553291B2 - Drop-off prevention aid and drop-off prevention external thread member including the same - 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 male 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, for example, the bolt and the nut are screwed by rotating the nut with a tool while holding the bolt head with one hand or a tool such as a hexagon wrench while applying the nut to the tip of the bolt exposed from the bolt hole opening. Combine. Therefore, Nishigochu, the one of the bolts and nuts must be held with one hand, otherwise, the bolt or nut falls off.
[0003]
However, holding the bolt or nut with one hand and tightening the nut or bolt with a tool with the other hand is poor 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.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to hold and fix a male screw member before screwing to a material to be fastened without dropping, so that a female screw member can be screwed to the male screw member without supporting the male screw member with one hand. Is to do.
[0005]
[Means for Solving the Problems and Functions / Effects]
Invention solves child the problems described above, in the stopper member for holding the male screw member on the inner peripheral surface of the male screw hole of the fastening member, this stopper member for holding the head portion of the male screw member The male screw side holding portion and the hole side holding portion that fits into the male screw hole of the material to be fastened are integrally formed, and the male screw member before screwing, which is held by the drop prevention member at the male screw side holding portion, has a hole. The hole is held by the side holding portion in the male screw hole of the material to be fastened, and 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 hole side holding portion. A flange portion provided between the head of the male screw member and the material to be fastened so as to extend outward from the hole-side holding portion, and the hole-side holding portion contacting the material to be fastened. the whole stopper member including a flange portion and, and coming off from the fastening member, it male Characterized by being formed of a material of the friction coefficient resulting in preventing or suppressing frictional force accompanying rotation when screwing the member and the female screw member.
[0006]
That is, by holding the male screw member such as a bolt in the male screw side holding portion of the falling-off preventing member and fitting the hole side holding portion into the male screw hole of the material to be fastened, the male screw before screwing is formed. Since the member is held so as to face the male screw hole of the material to be fastened, a female screw member such as a nut can be screwed together without manually supporting the male screw member before screwing. Therefore, one hand is free, and the tightening operation is facilitated.
Also, a clearance is formed between the inner diameter of the falling-off prevention member and the outer diameter of the male screw member, and a flange portion is provided between the head of the male screw member and the material to be fastened from the hole side holding portion. Preventing the male screw member from rotating together with the female screw member by forming the entire fall prevention member from a material having a coefficient of friction that generates a frictional force that prevents or suppresses the entrainment during screwing with the female screw member. Was completed.
[0007]
Specifically, the hole side holding part is formed of a flat cylindrical body that contacts the inner peripheral surface of the male screw hole of the material to be fastened, and the male screw side holding part is formed so as to expand outward from the hole side holding part. The fall prevention member formed of a flat cylindrical wall portion rising from the outer peripheral edge of the formed flange portion toward the opposite side of the male screw hole, and configured by the hole side holding portion, the male screw side holding portion, and the flange portion is, for example, a synthetic. It was good to be formed integrally with resin, and the falling-off prevention member could be handled as one bolt in a state where the male screw side holding portion was fitted to the male screw member.
[0008]
The shape of the hole-side 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 hole-side holding portion of the drop-off prevention member is in close contact with the inner peripheral surface of the male screw hole, and a stable holding state is obtained. can get.
[0009]
Also, the a stopper member configured as a falling-off preventing aid, de drop preventing external threads and the hole-side holding portion and the flange portion and the falling-off preventing aid constituted by the male screw holding portion externally threaded member is integrated to advance When the member is used, the time and labor for assembling the fall-off prevention aid when using the male screw member can be omitted, and the member can be easily handled.
[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 falling-off preventing member, a falling-off preventing cap C1 (hereinafter referred to as a cap C1) constituting the falling- off preventing member functions as a fall-off preventing auxiliary tool. It is made and, alternatively, formed by injection molding of a synthetic resin. The cap C1 is finished into a relatively thin flange member, and has a small-diameter flat cylindrical bolt hole insertion portion 1 (hole-side holding portion) and a larger flat-bottomed flat hexagonal cylindrical bolt holding portion ( Male screw side holding portion) 2 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.
[0012]
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.
[0013]
As shown in FIG. 1 (b), the bolt holding portion 2 has a hexagonal 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 hexagonal cylindrical wall portion 4 rising integrally from the wall. In other words, it can be said that the flange portion 3 forms the bottom of the bolt holding portion 2. As shown in FIG. 2 (b), the wall portion 4 has a shape and internal dimensions for just fitting the hexagonal head 6 of the bolt B, and its depth t2 (FIG. 1 (b)) Is adjusted so that the use of a tool such as a wrench is not hindered while sufficiently holding the wrench.
[0014]
FIG. 2 shows an embodiment of a captive male screw member in which the cap C1 of FIG. The cap C1 task to give Ru the captive bolt A1 constituting the captive male screw member Nde write fitted to the bolts B and, as the fall preventing 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 the factory by an automatic assembling machine at the time of manufacturing the cap C1, and the cap C1 can be shipped as a fall prevention bolt A1.
In the latter case, in order to omit the fitting step, it is possible to insert the bolt B at the time of injection molding of the cap C1 to integrally form the cap C1. , Welding and the like.
[0015]
When a nut is screwed into the captive bolt A1, as shown in FIG. 3A, the bolt hole insertion portion 1 of the cap C1 in which the bolt B is fitted is inserted into one of the fastening members Wa or Wb. It is applied to the opening of the bolt hole 11 and the flange 3 is inserted until it hits the outer surface 13 of the material Wa to be fastened. As a result, the cap C1 with the bolt B is in close contact with the inner peripheral surface 12 of the material Wa to be fastened all around its outer peripheral surface 1a. do not do. In this state, if the nut N is screwed in as shown in FIG. 3B, the bolt B and the nut N can be easily screwed together without supporting the bolt B with one hand. FIG. 3C shows a tightening completed state.
[0016]
If there are many bolts and nuts to be tightened, the work of inserting the captive bolt A1 should be performed first, and the work of tightening the nuts should be performed later. The efficiency of the setting work and the tightening work can be improved.
[0017]
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 hole-side holding portion, and is substantially parallel to the axial direction of the bolt hole around the entire circumference of the barrel-shaped cylindrical portion. It has a barrel-shaped bolt hole insertion portion 41 with a slit provided with a 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.
[0018]
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 hole-side holding portion by forming a plurality of slits 52 in a cylindrical portion to form a plurality of engagement claws 53. Prepare. 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. After the plurality of engaging claws 53 elastically reduce the diameter and enter the bolt hole 11, the locking projection 54 engages with the step 55 by expanding the locking stopper C <b> 5 holding the bolt B. It is stopped.
[0019]
As in the embodiment shown in FIG. 6 , the bolt hole insertion portion or the bolt holding portion of the cap for preventing falling off may be a bolt hole insertion portion 61 or a bolt holding portion 62 composed of projections at predetermined intervals (C6 to C8). ). Furthermore , as in the embodiment shown in FIG. 7 , when the shape of the bolt head is circular, or when a circular flange is provided on the seat of the bolt head, the same circular bolt holding portion 71 is provided. (C9).
[Brief description of the drawings]
FIG. 1 is a diagram showing a fall-off prevention aid according to an embodiment of the present invention.
FIG. 2 is a diagram dropout-preventing aid of the embodiment of FIG. 1 shows the captive male screw member that is integrated with the externally threaded member.
FIG. 3 is an operation explanatory view showing stepwise a screwed state of a falling-off prevention external thread member and a female screw member formed of a nut.
FIG. 4 is a view showing an auxiliary device for preventing falling off according to another embodiment.
5 is a sectional view showing a tightened state captive male screw member according to another embodiment.
FIG. 6 is a perspective view showing an embodiment in which a hole-side holding portion or a male screw-side holding portion has a protrusion.
FIG. 7 is a perspective view showing a case where a male screw side holding portion is circular.
[Description of sign]
1 Bolt hole insertion part (hole side holding part)
2 Bolt holding part (male screw side holding part)
3 Flange part 4 Wall part 5 Bolt hole 11 Bolt hole 12 Inner peripheral surface B Bolt N Nut W Workpiece

Claims (4)

In a fall-off prevention member for holding the male screw member on the inner peripheral surface of the male screw hole of the material to be fastened,
A male screw side holding portion that holds the head of the male screw member and a hole side holding portion that fits into the male screw hole of the material to be fastened are formed integrally with this drop-off prevention member ,
The male screw member before screwing held by the fall prevention member at the male screw side holding portion is held in the male screw hole of the material to be fastened by the hole side holding portion,
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 hole-side holding portion,
The flange portion is provided toward between the head and the fastening member of the male screw member so as to extend outwardly from the drop-off prevention in the member bore side holding portion,
The entirety of the drop-preventing member including the hole-side holding portion and the flange portion in contact with the material to be fastened is prevented or suppressed from falling off from the material to be fastened and co-rotating when the male screw member and the female screw member are screwed together. An auxiliary device for preventing falling off, which is formed of a material having a friction coefficient that generates a frictional force. The hole-side 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 male screw side holding portion is formed of a flat cylindrical wall portion that rises from the outer peripheral edge of the flange portion formed so as to expand outward from the hole side holding portion toward the opposite side of the male screw hole,
2. The fall-off prevention aid according to claim 1, wherein the fall-off prevention member composed of a hole-side holding portion, a male screw-side holding portion, and a flange portion is integrally formed. 3. The outer peripheral surface of the hole-side holding portion forms a barrel-shaped outer peripheral surface bulging outward, and is parallel to the entire circumference of the hole-side holding portion having the barrel-shaped outer peripheral surface in the axial direction of the male screw hole of the material to be fastened. The drop-off prevention aid according to claim 1 or 2 , wherein a plurality of slits are formed in the auxiliary tool. The male screw member has an auxiliary tool for preventing the male screw member from falling off on the inner peripheral surface of the male screw hole of the material to be fastened,
  This fall prevention aid includes a flange portion closely contacting the surface of the head of the male screw member on the material to be fastened, and a flat cylindrical wall portion rising from the outer peripheral edge of the flange portion on the outer periphery of the head of the male screw member. A male screw-side holding part is provided, and the male screw-side holding part is located on the outer periphery of the head of the male screw member, and the male screw member and the fall-off prevention auxiliary tool are united.
  The fall-off prevention aid includes a hole-side holding portion that fits with the inner peripheral surface of the male screw hole of the material to be fastened and holds the male screw member in the male screw hole of the material to be fastened. The auxiliary tool is integrally formed of a material having a coefficient of friction that generates a frictional force that prevents or suppresses co-rotation when the male screw member and the female screw member are screwed together. With clearance between the inner diameter of the hole-side holding part of the fall-prevention auxiliary tool to be inserted into the hole,
  A drop-off including a drop-off prevention cap, which prevents or suppresses falling-off of the material to be fastened of the male screw member from the hole for the male screw and rotation of the male screw member when screwing the male screw member with the female screw member. Prevent male screw member.

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