JP4620227B2 - Bonding bracket - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a fitting for connecting hoses such as fire hoses to each other, or connecting hoses and piping elements of pumps and other devices. More specifically, the present invention is a hose coupling metal fitting composed of a pair of identical fitting metal bodies with no distinction between males and females, which is undesirable when an impact is applied or when negative pressure is applied. The present invention relates to a coupling fitting that prevents uncoupling.
[0002]
[Prior art]
In general, there are plug-in fittings for hoses such as fire fighting hoses, and such plug-in fittings have a structure in which a pair of coupling fitting bodies are engaged and locked together in the axial direction. is there. Such plug-in type fittings are specified in, for example, Japanese Industrial Standards JIS B 9911, and such fittings are called “machino-type fittings” and are widely used.
[0003]
Such plug-in type fittings can be coupled and uncoupled with a simple device, and have favorable characteristics as a fitting for fire fighting hoses that require quick and reliable operation.
[0004]
However, in the conventional plug-in type fittings, there is a distinction between male and female in the pair of fittings to be joined. One is a male fitting and the other is a female fitting. Can not. For this reason, for example, during fire extinguishing work, when a plurality of fire hoses are extended and joined together, there is a possibility that the fire hoses may be accidentally extended so that the male brackets or the female brackets correspond. It is preferable to eliminate such a possibility from the viewpoint of speed of operation and certainty. In addition, the conventional coupling metal has to be manufactured with two types of metal fittings, ie, a male fitting and a female fitting, which have different structures.
[0005]
In order to solve such a problem, a hose coupling fitting having a pair of coupling fitting bodies having the same shape and no distinction between males and females has been developed. This joint fitting is the same as the applicant of the present patent application, Japanese Patent Application No. 7-275835 (Japanese Patent Laid-Open No. 9-119557) , Japanese Patent Application No. 8-94340 (Japanese Patent Laid-Open No. 9-280454). Japanese Patent Application No. 8-94341 (Japanese Patent Laid-Open No. 9-280453) and the like.
[0006]
Such a coupling fitting includes a pair of coupling fitting bodies that fit in a complementary manner, and a plurality of fitting projections are formed forward from these coupling fitting bodies, and these fitting protrusions are formed. Between the parts, a fitting recess is formed. These fitting projections are fitted in the fitting recesses of the mating fitting main body in the axial direction.
[0007]
Further, locking hooks are formed on one side surfaces of these fitting protrusions, and these locking hooks are engaged with each other in the circumferential direction by the relative rotation of the coupling metal body. Then, the coupling metal bodies are coupled by restricting the movement of the coupling metal bodies in the direction away from each other in the axial direction.
[0008]
Further, on the other side surface of the fitting protrusion, a biasing mechanism, for example, a plunger mechanism provided with a steel ball or the like biased in a protruding direction by a spring is provided. When the fitting protrusions are fitted in the mating fitting recesses in the axial direction, the plunger mechanisms are brought into contact with each other and pressed so that the coupling metal bodies are attached to each other in the rotation direction. The engaging hooks are engaged with each other in the circumferential direction, and the engaged state of the engaging hooks is maintained.
[0009]
By the way, in order to fit and engage such a coupling metal body with each other, a certain amount of play is required for each part. For example, in order to engage the locking hooks with each other, a certain amount of clearance is required on their engaging surfaces, so that the fitting protrusions are located at a position where the engaging surfaces of these locking hooks coincide. Need to go further. For this reason, in the state which said latching hook part mutually engaged, a play, ie, a clearance gap, is formed between the front end surface of a fitting protrusion, and the back wall surface of the other party fitting recessed part.
[0010]
In a normal case, the above-mentioned locking hooks are maintained in a state of being engaged with each other by the urging mechanism. However, when an impact or the like is applied, the urging mechanism resists the urging force of the urging mechanism. The coupling fitting main body moves in a direction close to each other by the gap, and the engagement surface of the locking hook part is released, causing rattling.
[0011]
Moreover, it is preferable that the engaging surface of said latching hook part is formed in overhang shape so that the front-end | tip edge may be located in the base end side of a fitting protrusion. By forming the overhang in this way, the engagement surfaces of these locking hooks mesh with each other when a hydraulic pressure acts on the hose and a force that causes the coupling bracket body to be pulled apart in the axial direction acts. , Preventing undesired decoupling.
[0012]
However, when the engagement surface of the locking hook portion is formed in an overhang shape in this way, the gap between the tip surface of the fitting protrusion and the back wall surface of the fitting recess is the amount corresponding to the overhang. Must be increased, and the above-described rattling increases.
[0013]
Such rattling not only generates abnormal noise when using this fitting, but also causes the coupling bracket body to rotate in the direction of rotation with the engagement surface of the locking collar portion separated as described above. When this load is applied, there is a possibility that the coupling of these coupling metal bodies is undesirably released.
[0014]
Further, when this fitting is used as, for example, a hose on the suction side of a fire truck, that is, a suction pipe joint, a negative pressure acts naturally. When negative pressure is applied in this way, an axial load is applied such that these coupling metal bodies are close to each other.
For this reason, the engagement surfaces of the locking collars of the fitting protrusions may be separated from each other, and these engagements may be released.
[0015]
[Problems to be solved by the invention]
The present invention has been made based on the above circumstances, the fitting of the hose as described above, if and an impact is applied, even when the negative pressure is applied, close these fitting body to each other providing a fitting which is capable of preventing undesired bonds cancel these fitting body to regulate the relative rotation of these fitting body after engagement surface of the locking hook is separated Te Is.
[0016]
[Means for Solving the Problems]
The present invention according to claim 1 is a coupling fitting for connecting piping elements, and is formed on a pair of coupling fitting main bodies having a cylindrical shape and front end surfaces of these coupling fitting main bodies, and abuts each other in the axial direction. A sealing surface, a plurality of fitting protrusions that are arranged in the circumferential direction so as to surround the sealing surface from the coupling metal body and project in the axial direction, and a fitting recess formed therebetween, The fitting protrusions and the fitting recesses of the pair of coupling metal bodies are axially fitted to the fitting depressions and the fitting protrusions of the coupling metal body on the other side, and the mating protrusions are opposed to the mating protrusions. In which a locking collar portion is formed that locks in the circumferential direction on the fitting protrusion of the coupling metal body to restrict axial movement and locks the pair of coupling metal bodies in the axial direction.
The front end surface of each of the fitting protrusions of the pair of coupling metal bodies and the inner wall surface of the fitting recess of the mating coupling metal body are in the engaged state of the locking hooks. Are spaced apart in the axial direction,
Engagement surface of the locking hook in each of the pair of fitting body, locking the proximal end side of said of said fitting projection of said locking hook is formed hook Is inclined so as to approach the back wall surface of the fitting recess facing in the axial direction as it goes to the tip away from the fitting protrusion formed .
The rear wall surface of the fitting recess of the mating fitting body on the opposite side is located on the tip surface of the fitting protrusion on the opposite side of the engagement surface of the locking collar in the axial direction. The restriction protrusion is formed so as to approach
On the rear wall surface of the fitting recess, the engagement surface of the locking hook portion of the fitting protrusion of the pair of coupling metal bodies is mutually connected to the proximal end portion on the fitting protrusion side. The locking protrusions of the fitting protrusions of the pair of coupling metal bodies are received while receiving the restricting protrusions of the coupling metal body on the other side when they are separated from the axially locked state in the axial direction. A recess is formed that allows rotation in the circumferential direction of the pair of coupling metal bodies to a position where the engagement surfaces of the two engagement surfaces do not face each other in the axial direction and restricts further rotation .
It is characterized by that.
[0017]
In the coupling metal fitting of the present invention according to claim 1 , a negative pressure is applied to the impact or the inside by a combination of the restriction protrusion on the front end surface of the fitting protrusion and the recess on the back wall surface of the fitting recess. Even in the case of the action of these, the coupling metal bodies are close to each other and the relative rotation of the coupling metal bodies after the engagement surface of the locking collar part is separated is restricted, and the coupling metal bodies are undesired. Can be prevented from being released. [0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, explaining the basic structure of fitting the implementation form of the present invention with reference to FIGS. 1 to 3 is applied. In this embodiment, the coupling fitting is applied to a fire hose coupling fitting. The coupling fitting is composed of a pair of coupling fitting bodies 1a and 1b having the same structure, and fire hose 2a and 2b are connected to the coupling fitting bodies 1a and 1b, respectively.
[0019]
These coupling metal bodies 1a and 1b are each provided with a cylindrical body 3, which has a substantially cylindrical shape, and a hose attachment portion 4 having serrated irregularities is formed on the inner peripheral surface thereof. Yes. And the edge part of fire hose 2a, 2b is inserted in this hose attachment part 4, The outer peripheral surface of this hose is pressed against this hose attachment part 4 by the crimping ring (not shown) from the internal peripheral surface of these hoses. Install this fire hose.
[0020]
A cylindrical sealing surface member 5 is screwed on the inner peripheral surface of the front end portion of the cylinder body 3, and the front end surface of the sealing surface member 5 is formed as a sealing surface. A sealing member 6 such as is attached. Therefore, when these coupling metal bodies 1a and 1b are fitted and coupled to each other in the axial direction, these sealing members 6 are brought into contact with each other, and the inside of these cylinder main bodies 3 communicates with each other and has a sealing property. To maintain.
[0021]
A plurality of, for example, six fitting projections 8 are integrally projected at the front end of the cylinder body 3. These fitting protrusions 8 are arranged at equal intervals in the circumferential direction, and protrude in the axial direction with respect to the sealing surface of the sealing surface member 5. Further, a space between these fitting protrusions 8 is formed as a fitting recess 7. When these fitting metal bodies 1a and 1b are abutted in the axial direction, one fitting metal body 1a The fitting protrusion 8 fits in the fitting recess 7 of the other coupling metal body 1b, and the fitting protrusion 8 of the other coupling metal body 1b fits in the fitting recess 7 of the one coupling metal body 1a. Mates and fits in a complementary fashion.
[0022]
In this case, the width of the fitting recess 7 is slightly wider than the width of the fitting protrusion 8. Accordingly, the fitting protrusions 8 are fitted in the fitting recesses 7 in the axial direction and are also rotatable by a predetermined amount in the circumferential direction.
[0023]
A stepped hook-shaped locking hook 9 is formed on one side surface 8a of the fitting protrusion 8, respectively, and these are engaged with the locking hook of the mating protrusion on the other side. It is configured to engage in a direction. Therefore, in a state where these fitting projections 8 are fitted in the mating fitting recesses 7 in the axial direction, the coupling metal bodies 1a and 1b are rotated relative to each other, and one of the fitting projections 8 is When the side surfaces 8a are close to each other, these locking hooks 9 are engaged with each other and locked in the axial direction as shown in FIG. 3, and the coupling metal bodies 1a and 1b are coupled to each other. Note that. A bent portion 11 for preventing stress concentration at this portion is formed at the base portion of the locking collar portion 9. Further, the leading end corners of the other side surfaces of these fitting protrusions are formed in an arc shape to form a guide portion 12, and when these are fitted, these guide portions 12 come into contact with each other. It is configured as follows.
[0024]
Further, the engaging surfaces 9a of these locking hooks 9 are inclined in an overhanging state by a predetermined angle a so that the leading edge thereof is located on the base end side of the fitting protrusion 8. When a load is applied in a direction in which the coupling metal bodies 1a and 1b are separated from each other due to internal water pressure or the like in a state in which they are fitted, the locking hooks 11 are more strongly fitted, and the coupling metal body It is configured to reliably prevent the disconnection of 1a and 1b.
[0025]
In addition, although the structure of said fitting protrusion 8, the fitting recessed part 7, the latching hook part 9, etc. becomes a special structure in order to prevent an undesired coupling | bonding cancellation | release as mentioned above, The point will be described in detail later.
[0026]
Moreover, the other side surface 8b of these fitting protrusions 8 is inclined with respect to the axial direction of these coupling metal bodies 1a and 1b. Therefore, the fitting protrusion 8 is formed in a taper shape such that the circumferential width becomes narrower as it goes to the tip, and the fitting recess 7 similarly has its circumferential width as it goes to the inner part. Is formed in a taper shape such that becomes narrower. Thereby, fitting of these fitting protrusions 8 and fitting recesses 7 becomes easy. In addition, one side surface on which the above-described locking hook portion 9 is formed is formed substantially parallel to the axial direction of the coupling metal bodies 1a and 1b.
[0027]
Further, an urging mechanism 10 is provided on each of the other side surfaces 8b of the fitting protrusions 8. These urging mechanisms 10 are constituted by urging members, for example, steel balls 15, which are slidably accommodated in a cylindrical case member 14, and springs 16 which urge the steel balls 15 in the protruding direction. These urging mechanisms 10 are embedded in the other side surfaces of the fitting projections 8. Therefore, when these fitting projections 8 are fitted in the mating fitting recesses 7 as shown in FIG. 3, the steel balls 15 come into contact with each other and are pressed against each other. The other side surfaces of the projections 8 are urged away from each other, and as a result, one side surface 8a of the fitting projection 8 is urged so as to be close to each other. The locking hooks 9 are biased so as to engage with each other.
[0028]
Further, a plurality of tool grooves 20 are formed on the outer peripheral surfaces of these coupling metal bodies 1a and 1b. These tool grooves 20 are formed in a shape that can be fitted with a tool such as a wrench, for example, and in the unlikely event that the coupling of these coupling metal bodies 1a and 1b cannot be released due to the engagement of sand or the like. Can be released by fitting a tool such as a wrench into these tool grooves 20 and forcibly turning the coupling metal bodies 1a and 1b.
[0029]
Further, in FIG. 4 shows an implementation embodiment of the present invention applied to the basic structure of the fitting, which is shown in FIGS. In this configuration, stepped restricting protrusions 37 and 38 that are in contact with each other as cam surfaces are provided on the front end surface of the fitting protrusion 8 and the back wall portion of the fitting recess 7. 37 and 38 are separated from each other in the state in which the locking collar portion 9 is engaged.
[0030]
In this embodiment, when the coupling metal bodies 1a and 1b are relatively rotated by an impact or the like in a state where the engagement surface 9a of the locking collar portion 9 is separated due to an impact or an internal negative pressure. Since these restricting protrusions 37 and 38 come into contact with each other and further rotation is restricted, there is less possibility of undesired release of the connection of these connecting metal bodies.
[0031]
The present invention is not limited to the above-described embodiment. For example, the present invention is not limited to the fitting for fire fighting hoses, and can be applied to a fitting for connecting piping elements for various other purposes in general. Moreover, the coupling fitting of the present invention can be formed of any material such as metal, synthetic resin, and other composite materials.
[0032]
【The invention's effect】
As described above, according to the present invention, even when an impact or a negative pressure is applied to the inside of the engaging hook portion in the engaged state, these coupling metal bodies are close to each other and the engaging surface of the engaging hook portion is The effect is great, for example, by restricting the relative rotation after the separation and reliably preventing the union of the coupling metal bodies from being undesirably released.
[Brief description of the drawings]
FIG. 1 is a perspective view of a basic structure of a coupling fitting to which an embodiment of the present invention is applied .
FIG. 2 is a side view showing a cross section of one of the coupling metal bodies of the coupling metal of FIG.
3 is a plan view of a fitting state between a fitting protrusion and a fitting recess of the coupling metal fitting in FIG. 1. FIG.
[4] The fitting protrusion and a portion of the locking hook of the fitted state of the embodiment of Figure 1 to the present invention applied to the basic structure of the fitting, which is shown in FIG. 3 shows schematically Plan view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a, 1b Coupling metal fitting body 7 Fitting recessed part 8 Fitting protrusion 9 Locking hook part 9a Engagement surface 10 Energizing mechanism 37, 38 Restriction protrusion

Claims (1)

A coupling fitting for coupling piping elements, a pair of cylindrical coupling fitting bodies, a seal surface formed on the front end face of these coupling fitting bodies and axially abutted with each other, and the above-described coupling fitting body A plurality of fitting protrusions arranged in the circumferential direction so as to surround the sealing surface and protruding in the axial direction, and fitting recesses formed between them, and the fitting protrusions of the pair of coupling metal bodies And the fitting recess are axially fitted to the fitting recess and the fitting protrusion of the mating fitting main body on the other side, and the fitting protrusion is connected to the fitting projection of the mating fitting main body on the other side. In what is formed with a locking collar portion that locks in the circumferential direction and restricts movement in the axial direction and locks the pair of coupling metal bodies in the axial direction.
The front end surface of each of the fitting protrusions of the pair of coupling metal bodies and the inner wall surface of the fitting recess of the mating coupling metal body are in the engaged state of the locking hooks. Are spaced apart in the axial direction,
Engagement surface of the locking hook in each of the pair of fitting body, locking the proximal end side of said of said fitting projection of said locking hook is formed hook Is inclined so as to approach the back wall surface of the fitting recess facing in the axial direction as it goes to the tip away from the fitting protrusion formed .
The rear wall surface of the fitting recess of the mating fitting body on the opposite side is located on the tip surface of the fitting protrusion on the opposite side of the engagement surface of the locking collar in the axial direction. The restriction protrusion is formed so as to approach
On the rear wall surface of the fitting recess, the engagement surface of the locking hook portion of the fitting protrusion of the pair of coupling metal bodies is mutually connected to the proximal end portion on the fitting protrusion side. The locking protrusions of the fitting protrusions of the pair of coupling metal bodies are received while receiving the restricting protrusions of the coupling metal body on the other side when they are separated from the axially locked state in the axial direction. A recess is formed that allows rotation in the circumferential direction of the pair of coupling metal bodies to a position where the engagement surfaces of the two engagement surfaces do not face each other in the axial direction and restricts further rotation .
A coupling fitting characterized by that.

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