BRPI1003296B1 - improvement on female pneumatic quick coupler - Google Patents

Abstract

improvement on female part of pneumatic quick coupler. The invention relates to the pneumatic quick coupler female part improvement which is provided with a double internal sealing system and a simplified but effective safety locking system against involuntary decoupling of the male pin. the quick coupling female part improvement comprises a body (11) formed of only one part. the rear end of the body (11) has an internal thread (111) for fixing a hose. the front end of the body (11) is surrounded by a short sliding outer sleeve (12) which is axially displaced to allow the introduction of a male pin (p). after the internal thread (111) the body (11) has a peripheral groove (112) into which a snap ring (13) which engages the spring (14) of the fluid seal internal valve (15). valve (15) has a peripheral channel (151) that houses an o-ring (16) which contacts a circumferential shoulder (113) with a conical surface located within the body (11). the shoulder (113) downstream of the o-ring (16) has a second peripheral groove (114) where a second o-ring (17) is positioned to seal the male pin nozzle (p) when coupling to the body (11) of the female part. the inner and front end of the body (11) has a chamber with holes that house the male pin retaining balls (18). externally, the front end of the body (11) has a first recess (115) which houses a snap ring (19) locking the sliding outer sleeve (12) and, after the ball holes (18), a second recess (116) ) where a spring (20) is positioned which permanently holds the outer sleeve (12) pressed against the snap ring (19). the outer sleeve (12) internally has a peripheral shoulder (121) that holds the balls (18) permanently seated within the holes in the body chamber (11). the face of the outer sleeve (12) facing the center of the body (11) has an axial groove (122) where a ball (21) fits into the body (11) as the outer sleeve (12) is recessed to make it possible to insert the male pin (p).

Description

The present invention relates to the development developed into a pneumatic quick coupler female part which is provided with a double internal sealing system and a simplified yet effective safety locking system against involuntary decoupling. of the male pin.

Female parts of known quick couplings are employed for coupling male parts (pins), usually coupled to the ends of hoses. An example of a conventional female part is described in patent document MU 8500833-8, by the same inventor, illustrated in figures 1 and 2, which comprises a body (20) formed by a threaded support (21), an intermediate sleeve (22) and an outer sleeve (23). The bracket (21) is threaded into the machine or implement where the female coupling is installed. Within this body (20) is mounted a connector (24) which houses a male part, not shown. Inside the connector (24) is mounted a valve (25) that prevents fluid from escaping when coupling or uncoupling the male part. This valve (25) is partially mounted within a cylindrical seat (28) and is constantly closed by a spring (31). Upon insertion of the male part into the coupling (20) the connector (24) recedes by dragging the cylindrical part (28). To prevent internal pressure generation, which would make coupling of the male part difficult, a pressure relief hole (26) is made in the threaded bracket (21) of the female part body. This orifice (26) is made diagonally to communicate the inner tube (27) at the bottom of the cylindrical part (28) with the outside. To prevent dirt and particulate matter from entering the female part body, a sealing ring (30) is positioned in a deep peripheral groove that is machined into the thick wall portion of the threaded support (21).

Another example of a conventional female part is described in patent document MU 8900251-9, also by the same inventor, illustrated in figures 3 and 4, comprising the same components, namely a body (40) formed by a threaded support ( 41), an intermediate sleeve (42) and an outer sleeve (43), with a connector (44) for the male coupling part (not shown) and a valve (45) preventing the outlet fluid when coupling and uncoupling the coupling. The threaded support (41) is provided with a pressure relief hole (46) which is longitudinally executed to communicate the inner tube (47) at the bottom of the inner cylindrical seat (48) with a shallow peripheral groove ( 49) machined to the thick wall portion of the threaded bracket (41). Within the shallow groove (49) is a fully enclosed sealing ring (50) that seals the hole (46), preventing particulate material from entering the female coupling body (40). The sealing ring (50) has a circular cross section.

Still another example of a conventional female part is illustrated in Figures 5 to 9 and comprises a body formed by a hose-bearing bracket (1) (not shown) and a front cylindrical part (2) which is threaded mounted on the support (1). A top sealing part (3) is pressed between the edge of the support (1) and the edge of the cylindrical part (2). This sealing part (3) acts as a seat for the valve (4), which is kept permanently in the closed position while the female is uncoupled (without the male pin) by spring action (5). An outer sleeve (6) must be moved axially over the cylindrical part (2) when it is desired to insert a male pin (P) into the female coupling. The sleeve (6) has a front inner peripheral tooth (61) which is locked by the snap ring (7) to prevent it from escaping out of the cylindrical part (2). The sleeve (6) has a second inner peripheral tooth (62) which at rest holds the balls (8) within the holes (21) of the cylindrical part (2). The balls (8) are intended to trap pin (P) through its outer peripheral tooth (PD) within the cylindrical part (2) while maintaining the pneumatic coupling. The sleeve (6) has between the two teeth (61 and 62) a recess (63) which allows the balls (8) to enter when the sleeve (6) is retracted for coupling or uncoupling of the pin (P). A spring (9) positioned between the protrusion (22) of the cylindrical part (2) and the rear tooth (62) keeps the sleeve (6) permanently projected forward, blocking the radial movement of the balls (8). A locking ring (10) is threaded into the outer thread (23) of the cylindrical part (2) enabling it to rotate in order to block the recoil of the outer sleeve (6), which prevents the unintentional release of the pin ( P) from inside the female coupling.

However, this conventional pneumatic quick coupler female part has the following drawbacks: • The body comprises 5 machined parts, namely threaded bracket, cylindrical part, outer sleeve, valve and locking ring, which demands high raw material consumption. , high number of operations, complex assembly and excessive weight; • the part responsible for sealing the valve when the coupling is disengaged is the one that seals the pin when the coupling is engaged, causing great stress and wear of the sealing part; • The axial displacement of the locking ring occurs through several turns, as it employs the principle of the conveyor thread, which requires operator effort, as well as a greater thickness of the cylindrical part wall to allow machining of the thread threads. ; • The outer sleeve is long as it has two inner peripheral teeth spaced by an intermediate peripheral ball recess and another spring recess, which requires more material. It is therefore an object of the present invention to provide a novel concept of pneumatic quick coupler female part which, despite greater simplicity of construction, is capable of effectively overcoming said limitations of the prior art. The pneumatic quick coupler female part improvement proposed by the invention comprises a body formed of only one piece. The rear end of the body has an internal thread for hose attachment. The front end of the body is surrounded by a short sliding outer sleeve that is axially recessed to allow the introduction of a male pin. After the thread the body internally has a peripheral groove in which a snap ring which acts as a spring stop of the fluid sealing valve is fitted. The valve has a peripheral channel that houses an O-ring that contacts an internal peripheral shoulder with conical body surface. O-ring seals female coupling when pin is not inserted. The shoulder that is positioned downstream of the O-ring has a second peripheral groove where a second O-ring is positioned to seal the male pin nozzle when it engages within the female part body. The inner and front end of the body has a chamber with holes that house the retaining balls of the male pin. Externally, the front end of the body has a first peripheral groove that accommodates an outer sleeve locking snap ring and after the ball holes a second recess where a spring is positioned that permanently holds the outer sleeve pressed against the snap ring. The outer sliding sleeve internally has a peripheral shoulder that keeps the balls permanently seated within the holes in the body chamber. The face of the outer sleeve that faces the center of the body has an axial groove where a fixed ball fits into the body when the sliding outer sleeve is recessed to allow the male pin to be inserted.

When it is desired, for safety, to stop the recoil movement of the sliding outer sleeve and thus ensure permanent coupling of the male pin is sufficient to rotate it in fraction, misaligning the axial tear with the ball, causing the said ball acts as a stop that blocks the recoil of the sliding sleeve.

Optionally, the female coupling body can be made of two components, having a bushing that is threaded into the body's internal thread and which also has an internal thread for fixing a hose. In this construction option the spring is supported directly on the bushing, eliminating the snap ring. The pneumatic quick coupler female part improvement proposed by the invention results in the following advantages over conventional couplings: • Great simplicity, comprising only 3 machined parts, namely body, sliding outer sleeve and fluid sealing valve, dispensing with inner cylindrical part and external locking ring; • Demands less raw material consumption, fewer operations and simplifies the assembly process, resulting in higher productivity; • has smaller external dimensions, since internally it must preserve the same dimensions in order to accommodate the standardized male pin, and result in less weight; • has a large channel in the periphery of the body where the spring that causes the return of the sliding glove is housed, allowing the reduction of the body and glove diameters, as well as the weight and production cost of the coupling; • has a double inner seal, being the part responsible for sealing the valve when the coupling is decoupled distinct from the part that seals the pin when the coupling is coupled, reducing stress and wear on these components; • Locking of the outer sliding sleeve is by simple fractional turn rotation, reducing operator effort and operating time; • The body has a smaller wall thickness, as no external threading is required; • The sliding outer sleeve is short as it has only one inner peripheral tooth, with the peripheral recess for the balls on one side and the spring seat on the other side further reducing the demand for raw material. The quick coupling female part improvement proposed by the invention can be better understood by the following detailed description, which is based on the attached drawings, listed below: Figure 1 - side view of a first conventional female coupling model;

Figure 2 - axial section of the first conventional female coupling model;

Figure 3 - axial section of a second conventional female coupling model;

Figure 4 - Internal detail of the second conventional female coupling model;

Figure 5 - perspective view of a third conventional female coupling model;

Figure 6 - top view of the third conventional female coupling model;

Figure 7 - axial section of the third conventional female coupling model;

Figure 8 - axial section of the third conventional female coupling model with the coupling pin;

Figure 9 - Internal detail of the third conventional female coupling model with the coupling pin;

Figure 10 - perspective of the female coupling improved by the invention;

Figure 11 - top view of the female coupling of the invention;

Figure 12 - axial section of the female coupling of the invention;

Figure 13 - axial section of the female coupling of the invention with the coupled pin;

Figure 14 - Internal detail of the female coupling of the invention with the coupled pin;

Figure 15 - perspective view of a constructive option of the female coupling of the invention with the pin coupled;

Figure 16 - Axial section of the coupling option of the invention with the coupled pin.

Figures 1 to 9 illustrate conventional female quick coupler parts which have already been described above as an example of the prior art.

Figures 10 to 14 illustrate the pneumatic quick coupler female part embodiment proposed by the invention comprising a body (11) formed of a single part only. The rear end of the body (11) has an internal thread (111) for attaching a hose (not shown). The front end of the body (11) is surrounded by a short sliding outer sleeve (12) which is axially displaced to allow the introduction of a male pin (P). After the internal thread (111) the body (11) has a peripheral groove (112) in which a snap ring (13) which acts as a spring stop (14) of the internal fluid seal valve (15) is fitted. The valve (15) has a peripheral channel (151) which houses an O-ring (16) which contacts a conical surface (113) with a conical surface located inside the body (11). O-ring (16) seals female coupling valve (15) when pin (P) is not inserted. The shoulder (113), downstream of the O-ring (16), has a second peripheral groove (114) where a second O-ring (17) is positioned to seal the male pin nozzle (P) when coupling to the body (11) of the female part. The inner and front end of the body (11) has a chamber with holes supporting the male pin retaining balls (18) (P). Externally, the front end of the body (11) has a first recess (115) which houses a snap ring (19) for locking the sliding outer sleeve (12) and, after the ball holes (18), a second recess (116). ) where a spring (20) is positioned which permanently holds the outer sleeve (12) pressed against the snap ring (19). The outer sleeve (12) internally has a peripheral shoulder (121) that holds the balls (18) permanently seated within the holes in the body chamber (11). The face of the outer sleeve (12) facing the center of the body (11) has an axial groove (122) that fits a ball (21) attached to the body (11) when the outer sleeve (12) is recessed to make it possible to insert the male pin (P).

When it is desired, for safety, to stop the recoil movement of the outer sleeve (12) and to ensure permanent coupling of the male pin (P), it is sufficient to rotate it fractionally, misaligning the axial tear (122) with the ball ( 21) causing the ball (21) to act as a stop that blocks the recoil of the glove (12).

Figures 15 and 16 illustrate a constructive option of the quick coupler female part whose body (11 ') can be made of two components, having a bushing (22) which is threaded into the internal thread (111') of the body and which further has an internal thread for fixing a hose. In this construction option the spring (14) is supported directly on the bushing (22), eliminating the snap ring.

Claims (2)

1 - “PNEUMATIC QUICK-Hitch FEMALE PARTS IMPROVEMENT” intended to accommodate a pin (P), characterized in that it comprises: - a body (11) formed of a single piece with rear end having an internal thread (111) and front end involved by a short sliding outer sleeve (12), the body (11) having a peripheral groove (112) after the inner thread (111) having a snap ring (13) for the spring (14) of the valve (15) followed by a shoulder (113) with a second peripheral groove (114) where a second O-ring (17) is positioned for sealing the pin nozzle (P) and followed by a chamber with ball-bearing holes (18) ) for retaining the male pin (P), the body (11) having at the outer end a first recess (115) which receives a snap ring (19) for the sliding outer sleeve (12) and, after the ball holes ( 18), a second recess (116) where a spring (20) of the outer sleeve (12) is positioned ); - an internal fluid sealing valve (15) having a peripheral channel (151) that houses an O-ring (16) which contacts a conical surface peripheral shoulder (113) located within the body (11) ; - an outer sleeve (12) having an integral peripheral shoulder (121) which contacts the balls (18) and on the face facing the center of the body (11) an axial groove (122) of a ball (21) attached to it in the body (11). 2. "PNEUMATIC QUICK-Hitch FEMALE PARTS IMPROVEMENT" according to claim 1, characterized in that the body (11 ') has a bushing (22) which is threaded into the inner thread (111) at whose edge of the bushing (22 ) is directly supported by the spring (14) of the sealing valve (15).