JP2003279164A - Overtightening prevention nut and overtightening preventing connection body for hot water circulation adaptor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an overtightening prevention nut and an overtightening prevention connection body for a hot water circulation adaptor capable of easily fastening at always appropriate torque without requiring skill of an operator, loosening and reusing after idle rotation at set torque or more and of completely canceling disadvantage such as damage to thread ridge or damage to an article to be attached. <P>SOLUTION: These devices are composed of a nut main body 1 having engagement claws 14 projectingly provided at appropriate parts of an outer peripheral surface of a screw cylinder part 12 threadedly attached on a connection screw cylinder 42 of a hot water circulation adaptor 4 and a main body 3 having rotational power transmitting claws 34 engaging with the engagement claws 14 provided at appropriate parts of an inner peripheral surface of a connection opening part 32 providing the nut main body 1 rotatably and preventing the same form coming off and having a space part 33 for relieving the transmission claws corresponding to the rotational power transmitting claws 34 in such a manner that the rotational power transmitting claws 34 get over the engagement claws 14 when set torque or more act thereon. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, when fixing an object material with bolts and nuts.
The present invention relates to an overtightening prevention nut and an overtightening prevention connection body for a hot and cold water circulation adapter, which eliminates damage to a thread or an attached object itself due to overtightening of a screw.

[0002]

2. Description of the Related Art A conventional overtightening prevention nut for eliminating overtightening of a screw comprises a nut body and an operating portion for rotating the nut body (not shown). The nut main body is provided with an engagement receiving portion (for example, an engagement receiving tooth), and the operation portion is provided with an engaging portion (a thin tooth) which engages with the engagement receiving tooth.

When the operating portion is rotated, the nut body rotates, and when the torque exceeds a set torque, the engaging portion (thin teeth) is chipped or crushed, and the operating portion idles. This allows
Overtightening is prevented. The over-tightening prevention nut of this structure cannot be reused as well as reverse rotation (screw loosening) after idling because the engagement portion is damaged.

FIG. 7 is a sectional view showing a state in which the hot and cold water circulation adapter is attached and fixed to the bathtub wall by the connection body. The connection between the circulation adapter 4 and the connection body 6 is made up of the packing 6
It must be removable because of the replacement of 5, 66, the cleaning of scales in the connection body 6 and the circulation adapter 4, and the like. Therefore, the overtightening prevention nut having a structure that cannot be reused as described above cannot be adopted.

For this reason, in the conventional connection body for a hot and cold water circulation adapter, as shown in FIG. 7, the female screw 64 of the connection body 6 and the male screw 43 of the circulation adapter 4 are directly screwed together.

That is, the hot and cold water circulation adapter 4 comprises an adapter body 41 and a screw cylinder (a male thread 43 on the outer peripheral surface) 42 protruding from the body 41. The connection body 6 includes a body main body 61, a hose connection opening 61a provided on the base end side of the main body 61, and a connection opening 63 provided on the distal end side and internally provided with a female screw 64.

The adapter body 41 has an inner surface 5a of the bath wall 5.
On the side of the screw cylinder 4 with the packing 66 interposed therebetween.
2 is inserted and deployed in the through hole 51 of the bathtub wall 5. The female screw 64 of the body 61 is screwed onto the male screw 43, and the body 61 is rotated, whereby the adapter body 41 is firmly attached and fixed to the bath wall 5 via the packings 65 and 66.

[0008]

The conventional connection body has an advantage that it can be unscrewed from the screw cylinder (circulation adapter) when the packing is replaced. However, at present, the degree of screw tightening between the connection body (female screw) and the screw cylinder (male screw) depends on the skill of a skilled worker.

Therefore, when the screw tightening is loose by the operator, or when the screw tightening is too strong, there are various cases. If the screws are loosely tightened, liquid leakage may occur, and spilling of hot water is extremely dangerous. On the contrary, if the screws are tightened too much, there is a possibility that the screw threads may be damaged, and there is a possibility that the plastic bathtub wall may be destroyed.

The present invention solves the above problems, does not require the skill of an operator, can always be easily tightened with a proper torque, and can be loosened even after idling with a torque higher than a set value. An object of the present invention is to provide an over-tightening prevention nut and an over-tightening prevention connection body for a hot and cold water circulation adapter, which are possible and reusable, and in which disadvantages such as damage to a screw and damage to an attached object are completely eliminated.

[0011]

In order to achieve this object, an overtightening prevention connection body for a hot and cold water circulation adapter according to claim 1 of the present invention has the following structure. The over-tightening prevention connection body for the hot and cold water circulation adapter consists of a nut body with protruding engaging claws at appropriate places on the outer peripheral surface of the screw cylinder that is screwed into the connection screw cylinder of the hot and cold water circulation adapter, and the nut body is rotatably removed. At a proper place on the inner peripheral surface of the connection opening to be stopped and provided, a rotational force transmitting pawl that engages with the engaging pawl is provided, and a transmitting pawl escape space portion is provided corresponding to the rotational force transmitting pawl, and the setting is set or more. When the torque of (1) is applied, the rotational force transmitting claw is composed of a body body which is configured to ride over the engaging claw.

In the connection body for preventing over-tightening for the hot and cold water circulation adapter having such a structure, the nut body is rotatably arranged in the connection opening portion which is one end portion of the body body so as not to come off.

The female thread of the nut body is screwed into the male threaded cylinder of the adapter body protruding to the outer surface of the bath wall. And
When the connecting body is rotated, the rotational force transmitting claw engages with the engaging claw, the nut body rotates synchronously, and the connecting body advances to the bathtub wall side.

When the front surface of the nut body is in a state of firm contact with the outer surface of the bath wall, and when the connecting body is further rotated, that is, when a torque larger than a preset value is applied, the rotational resistance of the engaging claw is the rotational force transmitting claw. Acts on the base of.

That is, the thin-walled base portion, which is thin due to the transmission claw escape space, is retracted in the radial direction by the rotation resistance of the engaging claws. As a result, the rotational force transmitting claw rides on the engaging claw and further crosses the engaging claw.

Thus, when the connecting body is rotated at a torque equal to or higher than the set torque, the connecting body idles. In this way, the rotational force transmitting claws pass over the engaging claws, whereby the connection body idles, and damage caused by overpressure on the male screw and the bathtub wall is eliminated.

Further, the rotating force transmitting claws that have passed over the engaging claws and the engaging claws are engaged with each other at their vertical surfaces. Therefore, it is easy to rotate the engaging claw in the screw loosening direction, and reuse can be realized. Therefore, the packing can be replaced, the inside of the circulation adapter can be cleaned, and the like.

The overtightening prevention nut according to the present invention has the following construction. The overtightening prevention nut consists of a nut body that has a flange plate-shaped flange around one end of a screw cylinder part that has a threaded part on the inner peripheral surface, and an engaging claw on the outer peripheral surface of the screw cylinder part, and this nut. A rotational force transmitting pawl that engages with the engaging pawl is provided at an appropriate position on the inner peripheral surface of the cylindrical hole that rotatably retains the screw tubular portion of the main body, and the rotational force transmitting pawl is applied when a torque larger than a preset value is applied. Is composed of an operation holder provided with a transmission claw escape space portion for overcoming the engagement claw.

This overtightening prevention nut comprises a nut body and an operation holder for rotating the nut body.
The operation holder is a plate body having a hexagonal planar shape with a predetermined thickness, and a cylindrical cylindrical hole is opened in the plane, and the nut body is rotatably provided in the cylindrical hole and is prevented from coming off. .

The feature of this overtightening prevention nut is that the object to be attached is not limited. In other words, the hot water circulation adapter is not limited to being attached to the bathtub wall.

For example, a bolt (male screw) is penetrated through the two objects to be mounted, and an overtightening prevention nut is screwed onto this male screw. When the operation holder is rotated, the rotational force transmitting pawl engages with the receiving pawl, and the nut body rotates.

When the front surface of the nut body is firmly in contact with the object to be mounted and a torque larger than a preset value is applied, the rotational resistance of the engaging claws acts on the base of the rotational force transmitting claws. The base portion for projecting the rotational force transmitting claw is thin due to the transmitting claw escape space provided correspondingly.

Therefore, when the thin-walled base portion is retracted in the direction of increasing the diameter, the rotational force transmitting pawl rides on the engaging pawl and rides over it. Thus, the operation holder idles, and the attached object is fixed with an appropriate torque. Also, even after spinning
The rotating force transmitting claw and the engaging claw are engaged with each other in vertical surfaces, and can rotate the nut body in the loosening direction.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Specific embodiments of the overtightening prevention connecting body for a hot and cold water circulation adapter according to claim 1 of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an overtightening prevention connection body of an embodiment.

The over-tightening prevention connection body A is the body 3
And nut body 1. The body 3 is provided with hose connection ports 36, 3 for connecting the hose end fittings provided on the base end side.
6 and a connection opening 32 provided on the tip end side.

The cylindrical connection opening 32 is provided with three rotational force transmitting claws 34 projecting from the inner peripheral surface thereof at regular intervals. Further, at the position corresponding to the rotational force transmitting claw 34,
The transmission claw escape space 33 is provided in the shape of a groove, and the space between the groove-shaped space 33 and the transmission claw 34, that is, the base where the transmission claw 34 projects is a thin wall 33a that is easily bent.

The nut body 1 has an internal thread 13 on its inner peripheral surface.
A flange 11 in the form of a collar plate is provided around one end of a screw cylinder 12 provided with, and three engaging claws 14 are provided at appropriate positions on the outer peripheral surface of the screw cylinder 12 at regular intervals.

FIG. 2 is a sectional view showing a state in which the nut body 1 is fitted in the connection opening 32. A groove 15 is formed on the outer peripheral surface of the tip of the screw cylinder 12 of the nut body 1, and a groove 35 is also provided at a corresponding position of the cylindrical connection opening 32 (a position corresponding to the groove 15). .

A retaining ring 16 is interposed between the groove lines 15 and 35, and the nut body 1 and the connection opening (body body 3) 32 are rotatable with respect to each other and are attached in a retaining manner. There is. An O-ring 17 is provided between the connection opening 32 and the screw cylinder 12 to prevent liquid leakage.

FIG. 4 shows the rotating force transmitting claw 34 and the engaging claw 1.
4 shows the engagement relationship with No. 4. As shown in FIG. 1, the rotational force transmitting pawl 34 and the engaging pawl 14 both have vertical surfaces 34b and 14b at one end and an inclined surface (curved inclined surface) 1 at the other end.
4a and 34a. Further, the inclination angle of the curved inclined surface 14a on one end side of the engaging claw 14 and the engaging claw 1
The reference torque is set by setting the rising height of 4 and the like.

When tightening the screw, the inclined surface 14
It is set so that a and 34a engage with each other in a contact surface state, and the vertical surfaces 34b and 14b engage with each other in a contact surface state when the screw is loosened. When the screw is loosened, the problem of the set torque does not occur, so that the vertical rising surface, which exerts a force and is efficient, is engaged (see FIG. 6).

When the circulation adapter 4 is attached to the bathtub wall 5 by the hot water / water circulation adapter overtightening prevention connection body having such a configuration, it is performed as shown in FIG.

The hot and cold water circulation adapter 4 has an adapter main body 41 having a low temperature hot water suction hole on the front surface and a high temperature hot water discharge hole 44 on the side surface, and a connection screw tube 42 protruding from the main body 41 and having a male screw 43 on the outer peripheral surface. It consists of and.

The adapter body 41 is provided on the inner surface side 5 of the bathtub wall 5.
The connection screw cylinder 42 is located at the position a through the packing 52, and the through hole 51 of the bathtub wall 5 is inserted therein. The nut main body (body main body 3) 1 is screwed into a portion of the connecting screw cylinder 42 that projects to the outer surface side 5b of the bathtub wall 5 via a packing 53.

That is, the female screw 13 of the screw cylinder 12 is screwed into the male screw cylinder 42. Here, when the body body 3 is rotated, as shown in FIG. 4, the curved inclined surface 34a of the rotational force transmitting pawl 34 engages with the curved inclined surface 14a of the engaging pawl 14 in a surface contact manner.

Therefore, the nut body 1 rotates in synchronization with the body body 3, the body body (nut body 1) 3 advances to the bath wall 5 side, and the flange 11 surface of the nut body 1 presses the packing 53. .

Then, the surface of the flange 11 of the nut body 1 is in a firm contact state with the outer surface 5b of the bath wall, and when the body body 3 is further rotated, that is, when a torque above the set reference is applied, the engaging claws are engaged. The rotational resistance of 14 acts on the thin-walled base portion 33 a of the rotational force transmission claw 34.

That is, the thin-walled base portion 33a is easily bent by the transmission pawl escape space 33, the rotational force transmission pawl 34 retracts in the radial direction, and rides on the engaging pawl 14 as shown in FIG. Ride over the engaging claw 14 (see FIG. 6).

Therefore, when the body body 3 is rotated with a torque equal to or more than the set torque, the body body 3 idles. Thus, the circulation adapter 4 can always be attached and fixed to the bathtub wall 5 with an appropriate pressure regardless of the skill level of the operator. Therefore, male screw 4
Since no pressure higher than the set torque acts on 3 and the bathtub wall 5, there is no possibility of damaging it.

Further, as shown in FIG. 6, the rotational force transmitting pawls 34 that have passed over the engaging pawls 14 are vertical surfaces 34b, 1b of the mutual ones.
4b are brought into surface-to-face engagement. Therefore, the engaging claw (nut body 1) 14 can be rotated in the screw loosening direction with a light rotational force.

Therefore, when the packings 52, 53 are replaced, the body 3 can be easily removed from the male screw cylinder 42, and reuse after idling can be realized.

FIG. 8 is an exploded perspective view showing a concrete embodiment of the overtightening prevention nut according to the invention as defined in claim 4. In FIG. The overtightening prevention nut comprises a nut body 1 and an operation holder 2 for rotating the nut body 1.

This overtightening prevention nut has substantially the same structure as the nut body 1 of the previous embodiment shown in FIG. 1 in the structure of the nut body 1, and the engaging claw 14 and the rotational force transmitting claw 23.
Since the engaging structure with and is almost the same, detailed description of this point will be omitted.

The nut body 1 has a flanged plate-like flange 11 provided at one end of a screw cylinder 12 having an internal thread 13 on its inner peripheral surface.
Three engaging claws 14 are provided at appropriate positions on the outer peripheral surface of the screw cylinder 12 at regular intervals. Further, a plurality of retaining claws 15 are provided on the tip end side of the outer peripheral surface of the screw cylinder 12 so as to project.

The operation holder 2 is a plate body 21 having a predetermined thickness and a hexagonal planar shape, and is provided with a fitting recess 21a in which the flange 11 is fitted, and the fitting recess 21a.
A cylindrical tube hole 2 communicating with a and into which the screw tube 12 is inserted.
2 is formed through.

Three rotational force transmitting claws 23 are formed at appropriate positions on the inner peripheral surface of the cylindrical hole 22 and are open at predetermined intervals. Furthermore,
A transmission pawl escape space 24 is provided at a position corresponding to the rotational force transmission pawl 23, and the base portion on which the rotational force transmission pawl 23 stands is set to be a thin base portion 24a that is easily bent.

FIG. 9 is a perspective view showing a state in which the screw cylinder 12 is fitted and inserted into the cylinder hole 22 of the plate-shaped operation holder 2 to form an integrated structure. The retaining claws 15 are configured to project outward in a normal state and have a recessed base portion that is bent when a pressing force is applied.

That is, by forming the groove-shaped space (release space) 15a inside the screw cylinder 12, that is, inside the thickness of the cylinder 12 corresponding to the retaining claw 15, the retaining claw 15 is pushed inward. The base of the claw 15 is set to bend inward when pressure is applied.

Therefore, when the screw cylinder 12 is fitted in the cylinder hole 22, the retaining claw 15 is pressed by the inner peripheral surface of the cylinder hole 22, and the base of the claw 15 (the wall itself of the screw cylinder 12) faces inward. The hexagonal plate 21 bends and passes in a concave shape, returns to the original state after passing through the cylindrical hole 22, and is locked to the back surface side of the hexagonal plate body 21. As a result, the nut body 1 can be rotated with respect to the operation holder 2,
Moreover, it is attached in a retaining shape.

The overtightening prevention nut having such a structure is characterized in that the kind of the object to be used is not limited. For example, two objects to be attached, bolts (male screws)
Through, and screw the overtightening prevention nut onto this male screw. When the operation holder 2 is rotated, the torque transmitting pawl 23 engages with the engaging pawl 14 and the nut body 1 rotates.

That is, as shown in FIG. 10, when the operation holder 2 is rotated in the direction of the arrow, the inclined surface 23b of the rotation transmitting pawl 23 and the inclined surface 14a of the engaging pawl 14 are engaged in a surface contact state, and the nut is engaged. The main body 1 rotates in synchronization with the operation holder 2.

When the front surface of the flange 11 of the nut body 1 is firmly in contact with the object to be attached and a torque larger than a preset value is applied, the rotation resistance of the engaging claw 14 causes the thin base 24a of the torque transmitting claw 23 to move. Retreat in the direction of diameter expansion.

As a result, as shown in FIG. 11, the rotational force transmitting pawl 23 rides on the engaging pawl 14 and rides over it (see FIG. 12). As a result, the operation holder 2 idles, and the attached object is attached and fixed with an appropriate torque value.

As shown in FIG. 12, when the rotational force transmitting claw 23 passes over the engaging claw 14, the vertical surface 14b,
23b engage with each other in a surface contact manner. Therefore, the rotation operation in the screw loosening direction can be appropriately and easily performed, and the reuse can be realized.

[0055]

As described above, in the connection body for preventing over-tightening of the hot and cold water circulation adapter according to the invention described in claim 1, the nut body is rotatably provided in the connection opening portion of the body body. The engaging force of the rotating force transmitting claw of the nut body is engaged with the engaging force of the nut body, and the setting is made so that the rotating force transmitting claw gets over the engaging claw when a torque larger than the set value is applied. Regardless, the circulation adapter can always be attached and fixed to the bathtub wall by proper screw tightening.

Therefore, it is not possible to eliminate the disadvantage that the screw tightening is too strong and the male screw and the bathtub wall are damaged as in the conventional case, and the body body and the circulation adapter can be detached by loosening the screw. The over-tightening prevention nut can be reused, such as replacement of the above, cleaning of the body and the inside of the adapter can be performed.

In the overtightening prevention nut according to the invention as defined in claim 4, the nut body is rotatably provided in the cylindrical hole of the plate-like operation holder and is prevented from coming off. Since the engaging claws of the nut body are engaged and the torque transmitting claws are set so as to ride over the engaging claws when a torque greater than the set value is applied, proper screw tightening can always be achieved, and the male screw and the screw The disadvantage of damaging the mounting member can be eliminated.

Further, the rotating force transmitting claws that have passed over the engaging claws and the engaging claws are engaged with each other in vertical surfaces, and by rotating the operation holder in the loosening direction, the nut body can be easily removed from the male screw (bolt). The overtightening prevention nut can be reused, such as by removing. Further, since the operation holder is a plate body having a cylindrical hole in the surface, it has an advantage that the use is not restricted regardless of the kind of the material to be attached, and the excellent effects of achieving the object of the invention are achieved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a connection body for a circulation adapter according to claim 1.

FIG. 2 is a cross-sectional view showing a connection body for a circulation adapter.

FIG. 3 is a cross-sectional view showing a state where a circulation adapter is attached and fixed to a wall of a bath with a connection body.

FIG. 4 is an explanatory diagram showing a state in which the connection body and the nut body rotate in synchronization with each other.

FIG. 5 is a partially enlarged explanatory view showing a state in which the rotational force transmitting claw has been mounted on the engaging claw.

FIG. 6 is a partially enlarged explanatory view showing a state in which the rotational force transmitting claw has passed over the engaging claw.

FIG. 7 is a cross-sectional view showing a conventional connection body for a circulation adapter.

FIG. 8 is an exploded perspective view showing an overtightening prevention nut according to claim 4;

FIG. 9 is a perspective view showing an overtightening prevention nut.

FIG. 10 is an explanatory diagram showing a state in which the operation holder and the nut body rotate in synchronization with each other.

FIG. 11 is an explanatory diagram showing a state in which the rotational force transmitting claw has been mounted on the engaging claw.

FIG. 12 is an explanatory diagram showing a state in which the rotational force transmitting claw has passed over the engaging claw.

[Explanation of symbols]

1 nut body 2 Operation holder 3 body 4 circulation adapter 5 bathtub walls 12 screw cylinder 13 female screw 14 Engaging claw 14a inclined surface 14b vertical surface 21 Holder body 22 Tube hole 23 Rotational force transmission claw 23a inclined surface 23b vertical surface 24 Transmission claw relief space 24a thin-walled base 32 connection opening 33 Transmission claw relief space 33a Thin-walled base 34 Rotational force transmission claw 34a inclined surface 34b vertical surface 41 Adapter body 42 Screw tube for connection 43 Male 5a Bathtub inner surface side 5b Bathtub outer surface side

Claims (7)

[Claims] 1. A connection body with an overtightening prevention function for mounting and fixing a hot and cold water circulation adapter, in which a connecting screw cylinder is inserted into a through hole of a bathtub wall, the connection body being a connection of the hot and cold water circulation adapter. The nut main body with engaging claws protruding from the outer peripheral surface of the screw cylinder that is screwed to the screw cylinder, and the inner peripheral surface of the connection opening that rotatably retains the nut main body. A torque transmitting pawl that engages with the engaging pawl is provided, and a transmission pawl escape space is provided corresponding to the torque transmitting pawl, and the torque transmitting pawl passes over the engaging pawl when a torque larger than a set value is applied. Over tightening prevention connection body for hot and cold water circulation adapter consisting of the body body. 2. The rotating force transmitting pawl and the engaging pawl are engaged with each other in inclined planes in a surface contact state when tightening a screw, and in a vertical contact with each other when the screw is loosened. The connection body for preventing overtightening of the hot and cold water circulation adapter according to claim 1, wherein the connection body is set to be engaged. 3. The transmission pawl escape space is provided corresponding to the base portion of the rotational force transmission pawl so that the base portion of the rotational force transmission pawl retreats in the radial expansion direction when a torque larger than a set value is applied. It has been established in 1
Over-tightening prevention connection body for the hot water circulation adapter described. 4. A nut body in which a flange plate-shaped flange is provided around one end of a threaded cylinder portion having a threaded portion on its inner peripheral surface, and engaging claws are provided at appropriate positions on the outer circumferential surface of the threaded cylinder portion, and this nut body. The screw cylinder portion is rotatably pulled out and provided at an appropriate position on the inner peripheral surface of the cylinder hole. A torque transmitting pawl that engages with the engaging pawl is provided, and the torque transmitting pawl is operated when a torque larger than a preset value is applied. An over-tightening prevention nut consisting of an operation holder provided with a space for escaping a transmission claw that goes over an engagement claw. 5. The rotating force transmitting pawl and the engaging pawl are set so that their inclined surfaces engage with each other when the screw is tightened and their vertical surfaces engage with each other when the screw is loosened. The overtightening prevention nut according to claim 4, wherein 6. A retainer pawl is provided at a proper position on the outer peripheral surface of the screw cylinder portion so as to project outward in the normal state and recede in a concave shape upon receiving a pressing force. The overtightening prevention nut according to claim 4, wherein the operation holder is locked on the outer surface of the operation holder so as not to come off. 7. The transmission pawl escape space is provided so as to correspond to the base of the rotational force transmission pawl so that the base of the rotational force transmission pawl retreats in the radial expansion direction when a torque above a set value is applied. The overtightening prevention nut according to claim 4, which has been opened.