CN1817479B - Lance - Google Patents

Abstract

The invention provides a lance used in an air compressor, which comprises a housing (11) sealed by a spray head (12) including a nozzle (13) at the front portion and enclosing an air circulating passage (22) capable of being loaded with compressed air and being communicated with the nozzle (13) from the rear end portion. The lance also includes a spray medium container (23) arranged below the air circulating passage (22) in a work position and with a standpipe (26) communicating with the air circulating passage (22). The housing (11) and the spray medium container (23) are configured to sway with respect to each other in order to obtain an ever-horizontal position of the spray medium container (23) directionally independent of the housing (11). In a preferred embodiment, the spray head (12) is rigidly connected with the housing (11), and the spray medium container (23) is held on the housing (11) through a swing hinge (27).

Description

spray gun

technical field

The invention relates to a spray gun for operation on an air compressor.

Background technique

In known spray guns of this type, the housing is constructed tubular, which carries the spray head on one tube end and can be fixed on the other tube end by a bayonet-type connection. One to the air hose to the air compressor. The air compressor is, for example, a HVLP (High Flow Low Pressure) type compressor. The refillable spray medium container is fixedly connected to the housing via a neck section through which a standpipe protrudes near the bottom of the container in the interior of the tubular housing at the nozzle integrated in the spray head Near the air flow path between the hose connector and the spray head.

The operator can only work with the spray gun in the adjacent area limited by its arm length, wherein the operator must ensure that the tubular housing and thus the spray medium container are oriented as horizontally as possible , because the spray medium can only be discharged from the container if the spray gun is strongly deflected from the horizontal position when the spray medium container is completely filled, because otherwise the liquid spray medium flows from the standpipe towards the bottom outflow from the access site. It is basically impossible to spray surfaces that are horizontal or approximately horizontal or inclined at a small acute angle relative to the horizontal with good working results.

Contents of the invention

According to the invention, a spray gun for operation on an air compressor is proposed, which has a housing which is closed at its front end with a spray head comprising a nozzle and encloses a spray gun from its rear end. Lead to the air flow path of the nozzle, the latter can be loaded by compressed air through an air hose leading to the air compressor, the spray gun also has a spray medium container located below the air flow path in the working position and a submerged A standpipe in the spray medium container, which opens into the air flow path in the vicinity of the nozzle, the housing and the spray medium container being pivotable relative to each other. The spray gun according to the invention has the advantage that due to the pivotal suspension of the spray medium container with respect to the housing, the spray medium container is always oriented horizontally regardless of the orientation of the housing, and thus the standpipe is always aligned horizontally even when the spray medium is sprayed. In the case of small quantities, the immersion in the liquid spray medium is always sufficiently deep. An optimal application of the spray medium to the processing surface is thus ensured for any orientation of the spray gun. It can work in this way for a long time until the spray medium container is completely emptied.

Advantageous further developments and improvements of the spray gun specified according to the invention can be obtained by means of the following technical proposals.

According to a preferred embodiment of the invention, the spray head is rigidly connected to the housing, and the spray medium container is held on the housing via a pivot joint. In an embodiment of this construction, the spray gun can be held in all possible angular positions relative to the working surface, whereby horizontal and inclined surfaces such as ceilings, slopes, floors and the like can also be sprayed, e.g. painted .

According to an alternative embodiment of the invention, the spray medium container is held rigidly on the spray head and the spray head is connected to the housing via a pivot joint. In this embodiment of the invention, the spray gun can be used for spraying inaccessible surfaces, where the narrow spatial conditions do not allow the spray gun to be clamped horizontally. The stability of the articulated spray head is increased by the spray medium container suspended very low.

According to an advantageous embodiment of the invention, connecting means are provided on the rear end of the housing facing away from the spray head for the optional connection of extension tubes, handles or air hoses.

The coupling mechanism allows that the spray gun can be used optionally for close-area machining and for spraying surfaces that lie beyond the operator's arm's length. The extension tube and the handle itself carry the connection mechanism for connecting the air hose.

According to an advantageous embodiment of the invention, the extension tube and the handle each have an actuating lever for controllably opening the nozzle, which is controlled when the extension tube or the handle is attached to the housing. Intervention of the nozzle needle of the nozzle.

It is advantageous if the pivot joint can be locked manually.

Advantageously, the extension tube and the handle have a connection for the air hose at their end facing away from the housing.

It is advantageous if the connection means has at least one bayonet-type connection.

Advantageously, an operating lever is pivotably arranged on the extension tube for controllably opening the nozzle, preferably at a distance from an end of the extension tube which is remote from the housing. Set the front of the handle part.

Advantageously, a stop which limits the pivoting displacement of the actuating lever is arranged on the extension tube and is designed to be adjustable.

Advantageously, the first end of a pull cord is fastened to the actuating lever, the second end of which can be coupled to a nozzle needle which holds the nozzle closed under spring force.

Advantageously, the second end of the pull cord is fastened to an adapter part of an adapter consisting of two adapter parts which can be fixedly connected to each other, which adapter parts are arranged so as to be axially movable to a limited extent In the housing-side end of the extension tube and loaded by a compression spring supported on the tube side, the pull cord is tensioned.

Advantageously, the other adapter part of the adapter is arranged axially to a limited extent in the end of the housing carrying said connection means; On the adapter part, the pull cord pulls the adapter part towards a stop on the housing side due to a spring force acting on the draw cord.

Advantageously, the extension tube is configured as a telescopic extension tube.

Advantageously, an operating lever is provided on the housing for controlled opening of the nozzle.

Advantageously, the coupling of the pull cord leading to the nozzle needle from the second adapter part is carried out by means of a coupling, which is fixedly connected with the nozzle needle through a pin; The coupling is acted upon by the force of a compression spring exerting a spring force on the cord to move.

Advantageously, the housing has a first connecting piece connected to the injection head, a second connecting piece carrying the connecting means, and a pipe bend which connects the two connecting pieces to one another integrally.

Advantageously, the actuating lever arranged on the housing is held pivotably on the first socket and is arranged at a distance in front of the second socket, which is designed to grip the handle.

Description of drawings

In the following description, the invention is explained in greater detail with the aid of exemplary embodiments shown in the drawings. The accompanying drawings indicate:

Figure 1 A side view of a spray gun with an extension tube,

Figure 2 A longitudinal section of the spray gun with extension tube from Figure 1,

Figure 3 is a side view of a spray gun with a handle,

Figure 4 is a side view of a modified spray gun with telescoping extension tube,

Figure 5 An enlarged view of the spray gun with telescoping extension tube in Figure 4,

Figures 6 and 7 are partial side views of the spray gun with telescopic extension tube in two different processing positions in Figure 4,

FIG. 8 is a top view of the eccentric sleeve provided on the extension tube in the spray gun with extension tube in FIG. 2 .

Detailed ways

The spray gun shown in side view in FIG. 1 for working on an air compressor, for example on an HVLP type compressor, has a housing 11 which is closed with a spray head 12 on its front end (abgeschlo βen ). As can be seen in the sectional view of FIG. 2, a nozzle 13 is integrated in the injection head 12, which nozzle comprises an injection opening 14, a nozzle needle 15 for controlling the injection opening 14, and a closing spring 16, which closes The spring presses the nozzle needle 15 against a valve seat on the injection head 12 surrounding the injection opening 14 and thus closes the injection opening 14 . The injection opening 14 is more or less released by the axial movement of the nozzle needle 15 against the restoring force of the closing spring 16 .

The housing 11 has a first connecting pipe 17 carrying the spray head 12 and a second connecting pipe 19 integrally connected with the first connecting pipe through a pipe elbow 18. The second connecting pipe carries a connecting mechanism on the end side for To directly or indirectly connect an air hose 20 leading to the air compressor. In this embodiment, the connection mechanism is a locking element 211 of a bayonet type connection device 21 . The housing 11 consisting of the connecting pipes 17, 19 and the pipe elbow 18 encloses an air flow passage 22 which can be passed by an air compressor starting from the pipe end of the second connecting pipe 19 carrying the bayonet type connection 21. Compressed air from the air hose 20 is applied.

Furthermore, the spray gun has a spray medium container 23 consisting of a neck section 24 and a spray medium tank 25 detachably attached to the neck section 24 . The spray medium container 23 is held on the housing 11 by the neck section 24, and a standpipe 26 extending through the neck section 24 to near the bottom of the spray medium tank 25 opens into the air flow near the nozzle 13. Passage 22. In order to work universally with the spray gun when the spray head 12 is in different orientations, the neck section 24 of the spray medium container 23 is held on the first connecting piece 17 by means of a pivot hinge 27, so that when the first connecting piece of the housing 11 When the degree of inclination of 17 is different, this spray medium container 23 keeps its horizontal position all the time relative to its horizontal or horizontal position shown in Fig. The standpipe 26 is always immersed in the liquid spray medium contained in the spray medium tank 25 even when there is a small residual quantity of spray medium.

For securing purposes, the pivotal support of the spray medium container 23 via the pivot joint 27 can be locked in that the pivot joint 27 is clamped by means of a manually actuatable locking knob 28 .

In order to work on the position away from the operator with this spray gun, on the spray gun shown in Fig. The second locking member 212. The extension tube 30 is rigidly connected to the housing 11 via the bayonet connection 21 . A further bayonet connection 31 connects the tube end of the extension tube 30 facing away from the spray gun to the air hose 20 . Here, a locking part 311 of the bayonet connection 31 is fastened to the extension tube 30 and the other locking part 312 is fastened to the end of the air hose 20 . The locking elements 211 and 311 , 212 and 312 are configured identically, so that the air hose 20 can be connected directly to the housing 11 by means of the locking elements 211 and 312 when the extension tube 30 is removed. In this case—as not further shown here—the second socket 19 is designed as a grip handle and is provided with a corresponding handle part.

On the end of the extension tube 30 facing away from the housing 11 there is provided a handle part 32 for gripping the extension tube 30 . An actuating lever 33 for controlling the opening of the nozzle 13 is assigned to the handle part 32 . The operating lever 33 is held pivotably on a holding part 34 connected to the handle part 32 and which surrounds the extension tube 30 on the outside. In this case, the actuating lever 33 is designed as a one-armed toggle lever, which is supported at one end so as to be pivotable at a pivot point 35 . The other end section of the toggle lever extends at an acute angle beyond the handle part 32 at a distance therefrom and forms a grip for the operator. A pull cord 29 is fastened to the actuating lever 33 at a distance from the pivot point 35 , which leads inside the tube to the nozzle 13 and is connected to the nozzle needle 15 . If the actuating lever 33 is pivoted, the nozzle needle 15 is lifted from the spray opening 14 against the force of the closing spring 16 and compressed air flows out of the nozzle 13, which draws the metered spray from the spray medium container via the standpipe 26 The amount of medium is ejected through the nozzle 13.

In order to adjust the opening stroke of the nozzle needle 15, an adjustable stop 36 cooperating with the actuating lever 33 is provided, which limits the maximum possible swivel displacement of the actuating lever 33 and thus also limits the movement of the nozzle needle 15. Open the itinerary. In the exemplary embodiment of FIG. 2 , the stop 36 is realized by an eccentric sleeve 37 ( FIG. 8 ), which is rotatably arranged on the handle part 32 . By turning the eccentric sleeve 37 , the distance of the grip portion of the actuating lever 33 relative to the eccentric sleeve 37 is changed and thus the pivoting displacement of the actuating lever 33 is reduced to a greater or lesser extent.

In order to work with the spray gun in the close range, a handle 38 can be attached to the housing 11 instead of the extension tube 30 , as shown in FIG. 3 . The handle 38 also carries a locking member 212 on one end, and a locking member 311 on the other end, so that the handle 38 can be connected to the housing 11 on the one hand and the air on the other hand. Hose 20 is locked. In the handle 38 there is the same actuating mechanism as in the extension tube 30 for metered opening of the nozzle 13 , which actuating mechanism can intervene in the nozzle needle 15 when the handle 38 is attached to the housing 11 . For this purpose, for example, two adapter parts of an adapter, which will be described later in FIG. , the adapter connects the pull cord 29 fixed on the operating lever 33 with the pull cord extending in the housing 11 leading to the nozzle 13 . Such adapters can likewise be provided in the case of switchable use of the extension tube 30 .

The spray gun shown in FIG. 4 is modified with respect to the previously described spray gun, and the relative pivotability between the housing 11 and the spray medium container 23 is realized in such a way that the spray medium container 23 is held rigidly on the On the spray head 14, and the spray head 14 is connected with the housing 11 through a swing hinge 40. Furthermore, the housing 11 is connected to a telescopic extension tube 41 . The telescopic extension tube 41 is equipped with the corresponding bayonet type connection 21, 31, an operating lever 33 and a handle part 32 in the same manner as the extension tube 30 described in FIGS. Words refer to the previous description of the extension tube 30. Therefore, the same components are denoted by the same reference numerals.

In order to ensure that the spray gun can also be used without the telescoping extension 41 , the pull cord 29 for actuating the nozzle needle 15 is fastened on the end side to the actuating lever 33 , and at the other end of the cord is fastened to an adapter of the adapter 42 421 , the latter is held in the tube end of the telescopic extension tube 41 facing the housing 11 with limited axial movement. The clutch part 421 is loaded via a compression spring 49 supported on the tube side against a stop 50 in such a way that the pull cord 29 is tensioned. At the free end of the second socket 19 of the housing 11 , the second clutch part 422 of the clutch 42 is also held axially to a limited extent. The second adapter part 422 is connected to a coupling part 44 via a pull cord 43 and abuts against a stop 51 on the tube side via a compression spring 45 supported on the housing side and acting on the coupling part 44 superior. The coupling part 44 is rigidly connected via a pin 46 to the nozzle needle 15 , which is guided axially displaceably in a channel 47 formed in the injection head 12 . When the operating lever is not actuated, the injection opening 14 is closed by the compression spring 45 acting on the nozzle needle 15 via the pin 46 . A further actuating lever 48 , which is pivotably mounted on the first socket 17 of the housing 11 , acts on the coupling part 44 . If the further actuating lever is pivoted towards the second socket 19 , it moves the coupling piece 44 , wherein the coupling piece 44 lifts the nozzle needle 15 from the injection opening 14 via the pin 46 . The second connection piece 19 is formed as a grip handle and has a corresponding grip surface, not shown here, so that the spray gun can be operated by hand after the telescopic extension 41 has been removed and the operator can use it in the immediate area. Airbrush works. With the telescoping extension tube 41 attached, the adapter parts 421 , 422 cooperate with each other, and the adapter 42 is engaged. If the actuating lever 33 on the telescopic extension 41 is now actuated, the adapter 42 is axially moved to a limited extent via the pull cord 29 , whereby the nozzle 13 is opened again via the pull cord 43 and the pin 46 .

As can be seen from the sectional view of FIG. 5 , this spray medium container 23 corresponds to the spray medium container 23 described in FIGS. 1 to 3 , and therefore identical parts of the spray medium container 23 are provided with the same reference numerals. The standpipe 26 opens into the widened region of the channel 47 in which the nozzle needle 15 and the pin 46 are guided.

FIGS. 6 and 7 show different orientations of the telescopic extension tube 41 , shown only in sections. It can be clearly seen that the spray head 12 with the spray medium container 23 maintains its horizontal orientation independently of the orientation of the telescopic extension 41 . As a result, the spray medium can be applied from different positions of the operator on a vertical, hand-inaccessible surface.

Claims (19)

1. A spray gun for running on an air compressor, which has a housing (11), which is closed on its front end with a spray head (12) comprising a nozzle (13) and surrounds a The air flow path (22) leading from its rear end to the nozzle (13), which can be loaded with compressed air through an air hose (20) leading to an air compressor, the spray gun also has a A spray medium container (23) below the air flow path (22) and a standpipe (26) immersed in the spray medium container (23), which leads into the air flow path ( 22), it is characterized in that: the casing (11) and the spray medium container (23) are configured to be able to swing relative to each other. 2. Spray gun according to claim 1, characterized in that: the spray head (12) is rigidly connected to the housing (11), and the spray medium container (23) is held in the housing ( 11) on. 3. Spray gun according to claim 1, characterized in that: the spray medium container (23) is rigidly held on the spray head (12), and the spray head (12) is connected to the housing via a swing hinge (40) (11) CONNECTION. 4. Spray gun according to claim 2 or 3, characterized in that the pivot hinge (27; 40) can be locked manually. 5. Spray gun according to claim 1, characterized in that: a connecting mechanism is provided on the rear end of the housing (11) away from the spray head (12), for selectively connecting an extension tube (30 ) or handle (38) or air hose (20). 6. Spray gun according to claim 5, characterized in that the extension tube (30) and the handle (38) have connections for the air hose (20) at their ends remote from the housing. 7. Spray gun according to claim 5 or 6, characterized in that the connection means has at least one bayonet connection (21). 8. The spray gun according to claim 5, characterized in that an operating lever (33) is swingably arranged on the extension tube (30) for controllably opening the nozzle (13). 9. Spray gun according to claim 8, characterized in that: the operating lever (33) is arranged at a distance in front of a handle part (32), which is arranged on the extension tube (30) away from the housing near the end of the tube. 10. The spray gun according to claim 8 or 9, characterized in that: the extension tube (30) is provided with a stop (36) that limits the swing displacement of the operating lever (33), and the stop is configured as adjustable. 11. Spray gun according to claim 8, characterized in that: the first end of a pull cord (29) is fixed on the operating lever (33), and its second end can be connected with a nozzle needle (15) Coupled, the nozzle needle holds the nozzle (13) closed under spring force. 12. Spray gun according to claim 11, characterized in that the second end of the pull cord (29) is fixed in a joint formed by two coupler parts (421, 422) which can be fixedly connected to each other. On a first adapter part (421) of the device (42), the first adapter part is arranged in the end of the casing side of the extension tube (30) in an axially limited movable manner and is held on the tube side by a The supporting stage clip (49) is loaded to tighten the stay cord (29). 13. The spray gun according to claim 12, characterized in that: the second adapter part (422) of the adapter (42) is axially limitedly movable and arranged on the part of the housing (11) carrying the connecting mechanism. In the end; a pull cord (43) coupled with the nozzle needle (15) is fixed on said second adapter part (422), the pull cord due to a spring force acting on the pull cord (43) Instead, the second adapter part (422) is pulled towards a stop (51) on the housing side. 14. The spray gun according to claim 5, characterized in that the extension tube (30) is configured as a telescopic extension tube (41). 15. Spray gun according to claim 13, characterized in that an operating lever (48) is provided on the housing (11) for controllably opening the nozzle (13). 16. Spray gun according to claim 15, characterized in that the connection of the stay cord (43) leading to the nozzle needle (15) from the second adapter part (422) is carried out by means of a coupling (44), which The part is fixedly connected with the nozzle needle (15) through a pin (46); in order to make the coupling part (44) move against the force of a compression spring (45), the operating lever (48) acts on the coupling part (44) On, this stage clip exerts spring force on stay cord (43). 17. The spray gun according to claim 15, characterized in that: the housing (11) has a first connecting pipe (17) connected to the spray head (12), a second connecting pipe (19) carrying the connecting mechanism ) and a pipe elbow (18) that connects the two connecting pipes (17; 19) to each other, and the operating lever (48) provided on the housing (11) is swingably held on the first connecting pipe ( 17) on. 18. Spray gun according to claim 17, characterized in that the actuating lever (48) arranged on the housing (11) is arranged at a distance in front of the second socket (19) designed to grip the handle. 19. Spray gun according to claim 1, characterized in that an operating lever (48) is arranged on the housing (11) for controllably opening the nozzle (13).

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