WO2009106480A1

WO2009106480A1 - Spray gun comprising an extension device for extending the handle of the spray gun

Info

Publication number: WO2009106480A1
Application number: PCT/EP2009/052007
Authority: WO
Inventors: Joao Jorge Bergner; Nuray Tekogul; Joerg Albrecht; Christoph Cramer
Original assignee: Robert Bosch Gmbh
Priority date: 2008-02-25
Filing date: 2009-02-20
Publication date: 2009-09-03
Also published as: EP2257387A1; RU2010139288A; DE102008000396A1; EP2257387B1; RU2490073C2

Abstract

The invention relates to a spray gun (10) for dispensing spray material, comprising a housing (16), a receiving device (33) for receiving spray material containers (32a, 32b) of different heights (32a, 32b), a handle (18) for holding the spray gun and a extending device (20) that is provided on the handle for extending the length of said handle in order to adapt the length of said handle to the height (H1, H2) of a spray material container that is received by the receiving device such that the handle and the spray material container form together a support surface for supporting the spray gun. The extension device comprises at least one extension element (38, 60) that is secured to said handle in an adjustable manner in the longitudinal direction of said handle.

Description

Spray gun with an extension device for extending the handle of the spray gun

The present invention relates to a spray gun for dispensing an injection molding, in particular a water-dilutable and solvent-containing injection molding material, such as paints, varnishes, glazes, primers, stains, wood preservatives, or the like.

Spray guns of the type mentioned are known in the art in a variety of configurations. The spraying method used is usually the low-pressure spraying method, which is a method in which sprayed material sprays at a low pressure of about 0.2 to about 0.5 bar and with a high volume of air at about 200 liters per minute becomes. This HVLP spraying process achieves a low overspray, i. because of its low spray losses, coating levels up to about 65% and is thus superior to conventional processes that achieve coating levels between about 20 and about 35%. Characteristic of the method is the air surrounding the spray material, which reduces overspray and color fog. This results in advantages such as paint savings and low solvent emissions, which have a particularly environmentally friendly effect.

In order to be able to park such spray guns during a break in work, a shelf is usually provided, which is often formed by the bottom of a spray gun held on the spray container. In most cases, however, the bottom of the spray material receptacle does not suffice as a storage surface in order to be able to reliably prevent overturning and concomitant soiling and / or damage to the spray gun. To solve this problem, spray guns have been proposed in which the length of the handle of the spray gun is adjusted to the height of a spray gun arranged on the spray container so that the bottom of the container and the bottom of the handle together form a storage area for stopping the spray gun. In this way, the stability of the spray gun could be greatly improved.

In order to ensure this improved stability even at different levels Spruchtgutbehältern, it is necessary to adjust the handle length to the respective height of the Spritzgutaufnahmebehälters. In this regard, it is known to attach different high extension elements at the free end of the handle to achieve in this way the height compensation between the handle and Spritzgutaufnahmebehälter. A disadvantage of such different high handle extension elements, however, is that they can be lost, whereupon the described height compensation is no longer feasible. In addition, it is cumbersome to always carry several such handle extension elements with the spray gun. Finally, the user of the spray gun must select a handle extension element matching the height of the sprayer container to be used from a plurality of such elements, which may require the user to try several of these handle extension elements before finding the correct element. This can be very tedious.

Based on this prior art, it is an object of the present invention to provide a spray gun of alternative construction, which at least partially solves the problems mentioned above.

Disclosure of the invention To achieve this object, the present invention provides a spray gun for dispensing an injection molding comprising a housing; a receiving device for the optional recording of different levels of sprayed containers; a handle for holding the spray gun and provided on the handle extension means for extending the length of the handle to adjust the length of the handle to the height of a recorded on the receiving device Spritzgutbehälters that handle and Spritzgutbehälter together form a storage area for stopping the spray gun. According to the invention, the extension device has at least one extension element, which is fastened adjustably in the length direction of the handle. Due to the adjustability of the extension element in the length direction of the handle, in contrast to the prior art described above, only a single extension element is required. The attachment of the extension element to the handle creates a captive. Furthermore, the extension element is always carried along with the spray gun and is always ready for use accordingly.

Preferably, the extension element is received in an open to the free end of the handle cavity of the handle. Accordingly, the extension member does not take up extra space and does not affect the external appearance of the spray gun. If necessary, the extension element can be pulled out of the handle to adjust the length of the handle to the height of a Spritzgutbehälters.

Advantageously, at least one guide for guiding the adjustment movement of the extension element is provided, whereby the handling of the extension device is improved.

In addition, the extension device advantageously comprises a locking device by means of which the extension element can be locked in several positions. According to a first variant of the present invention, the positions which can be locked by means of the locking device are defined positions. In this regard, the locking device preferably includes at least two toothed components adapted to be selectively engageable with and disengaged from each other and defining the plurality of positions, wherein the locking occurs in the engaged state of the components. The geometry of the teeth of the toothed components, their pitch and the number of mutually corresponding teeth determine the plurality of positions.

The locking device preferably comprises at least one spring element, which biases the toothed components in their engaged state. In this way, an undesired change of a set position of the extension element can be prevented.

The biasing force of the at least one spring element is chosen so large according to a variant that the locked position of the extension element when stopping the spray gun is maintained, and chosen so small that the locking of the extension element by manual force on the extension element can be overcome. In other words, the biasing force of the at least one spring element can be overcome by manually applying a tensile or compressive force to the extension element. On the other hand prevents the extension element unintentionally moved from the user-selected locked position when the spray gun is parked on a substrate.

According to a further variant of the present invention, at least one of the toothed components is operatively connected to an actuating mechanism which is designed such that the inlet Grips state of the toothed components is released in its operation against the biasing force of the spring element. In other words, the locked position selected by the user can only be canceled by operating the actuating mechanism by the user.

Preferably, the actuating mechanism has a lever arranged to reduce the force required to release the engaged state of the toothed components. Accordingly, force for actuating the operating mechanism is reduced and the handling of the spray gun is improved.

Advantageously, the actuating mechanism has an actuating element arranged on the handle and accessible from the outside, such as a push button or the like, so that the user can conveniently operate the actuating mechanism.

According to an alternative embodiment of the present invention, the locking device is such that positions of the extension element are infinitely lockable. In this regard, the lock produced by the locking device is preferably non-positively.

embodiments

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In it is:

1 is a perspective view of a spray gun according to a first embodiment of the present invention in a first state; FIG. 2 is a perspective view of the spray gun shown in FIG. 1 in a second condition; FIG.

Fig. 3 is a partial longitudinal sectional view of a lower portion of the handle of the spray gun shown in Fig. 1, showing an embodiment of the handle and an extension device according to a first variant of the present invention;

Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 3;

Fig. 5 is a partial longitudinal sectional view of the handle of the spray gun shown in Fig. 1, showing an embodiment of the handle and an extension device according to a second variant of the present invention; and

6 is a cross-sectional view along the line VI-VI in Fig. 5th

Like reference numerals refer to the same or similar components below.

FIG. 1 is a perspective view showing a spray gun 10 according to an embodiment of the present invention. In the present case, the spray gun 10 is subdivided into two main units, namely an electrical unit 12 and a spray unit 14, which can be detachably connected to one another by means of a connecting device, not shown, in order to facilitate the cleaning of the spray unit 14 having color after use. The electrical unit 12 comprises a housing 16 which defines a receiving space for the electrical components (not shown) of the spray gun 10, in particular for a compressed air generating device. Is integral with the housing 16 a downwardly extending handle 18 is formed, which can be gripped by a user for handling the spray gun 10. Within the handle 18, an extension means 20 for extending the length of the handle 18 is provided, which is in Fig. 1 in the retracted state in which it protrudes only slightly from the bottom of the handle 18, but they are still taken by a user can. An operation switch 22 for turning on and off the spray discharge of the spray gun 10 is integrally formed with the handle 18 at an upper portion thereof so that an operator can easily operate it when grasping the handle 18. The side of the control switch 22, an adjustment 24 is provided, which is used for manual adjustment of the amount of spray, which is to be delivered by the spray gun 10 per unit time. At the rear lower end of the handle 18, a cable 26 is connected, which serves to supply the recorded in the housing 16 electrical components of the spray gun 10 with electrical energy.

The spray unit 14 comprises at its front end a spray nozzle 30, via which the spray material is discharged. The spray nozzle 30 is such that the user can set various beam shapes and beam directions in which the sprayed material is dispensed, such as a point beam, a horizontally extending elliptical beam, or a vertically extending elliptical beam. Accordingly, the jet shape of the injection molding can be adapted to a specific application. At the lower end of the spray unit 14, a spray material container 32a with the height Hi is detachably fastened to a holding device 33 of the spray unit 14. This releasable attachment can be done for example by means of a screw, a connector, a snap-in connection or the like.

The underside of Spritzgutbehälters 32 a and the underside of the extension device 20 are in height so each other coordinated that they together form a storage area for parking the spray gun 10. Thus, the spray gun 10 can be safely parked on a surface.

FIG. 2 shows the spray gun shown in FIG. 1 in a state in which the spray material container 32a having the height Hi has been replaced by a spray material container 32b having the height H ₂ , the height H _{2 being} greater than the height Hi. In order to adapt the extension device 20 to the greater height of the sprayed material container 32b, the extension device 20 according to FIG. 2 is in a state in which it has been pulled out in accordance with the height difference H ₂ -Hi. Thus, the Spritzgutbehälter 32b and the handle 18 or in this integrated extension device 20 in turn together form a storage area for parking the spray gun 10th

Hereinafter, a structure of the handle 18 and the extension device 20 according to a first variant of the present invention will be described with reference to Figs. 3 and 4, wherein Fig. 3 is a partial longitudinal sectional view of the lower portion of the handle 18 shown in FIG Handle 18 with the integrated therein extension device 20, and Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 3.

The handle 18 includes an outer wall 34 that defines a downwardly open cavity 36. In the cavity 36, the extension device 20 shown in FIGS. 1 and 2 is received. The extension device 20 comprises an extension element 38 in the form of an elongated insert provided with a pedestal 40, which is received in the direction of the arrow A upwardly and downwardly movably received in the cavity 36. The extension element 38 is received between sliding surfaces 41 which are formed in the interior of the cavity 36, these sliding surfaces 41, the extension element 38 during its up and down lead upward movement. A by means not shown fastening means 42, such as screws or the like, attached to the outer wall 34 of the handle 18 spring element 43 in the form of a bent leaf spring exerts a biasing force on the inner surface 44 of a pressure piece 46, which along sliding surfaces 48th is arranged transversely to the longitudinal direction of the handle 18 slidably. The pressure piece 46 is provided at its pointing to the extension member 38 front portion with a toothing 50 which engages in a similar manner to the extension member 38 teeth 52, whereby the extension member 38 is locked in a position. The toothing 52 of the extension element 38, the toothing 50 of the pressure piece 46 and the spring element 43 accordingly form a locking device. The geometries of the teeth 50 and 52, their tooth pitch and the number of mutually corresponding teeth are matched. For balancing the length of the handle 18 to the level of a bottom surface of a container 32a or 32b, the extension member 38 is gripped by a user at his stand 40 and pushed into the cavity 36 of the handle 18 or pulled out of this. The teeth 50 of the pressure element 46 and the teeth 52 of the extension element 38 are shifted from each other by the pressure piece 46 dodges against the bias of the spring element 43. The geometry of the teeth 50 and 52 and the biasing force of the spring element 43 are dimensioned such that the support leg 40 can be pulled out and pushed in without much effort, but it is ensured that caused by the engagement of the teeth 50 and 52 locking the extension element 38 is maintained when stopping the spray gun 10 on the jointly formed by the handle 18 and the bottom of a Spritzgutbehälters 32a or 32b storage area.

In the embodiment of the handle 18 and the extension device 20 shown in FIGS. 3 and 4, the length of the Handle 18 are easily adapted to the heights of different spray containers, which is done by simply pulling or pushing the extension element 38.

Hereinafter, an embodiment of the handle 18 and the extension device 20 according to a second variant of the present invention will be described with reference to Figs. 5 and 6, wherein Fig. 5 is a partial longitudinal cross-sectional view of the handle 18 and the extension device 20 according to this second variant and Fig. 6 is a cross-sectional view along the line VI-VI in Fig. 5.

According to this second variant, the extension device 20 comprises an extension element 60, which is also slidably received in the cavity 36 of the handle 18 along sliding surfaces 61 up and down and has a toothing 62 on its outer side. The toothing 62 of the extension element 60 is operatively connected to an actuating mechanism 63, which has a lever 68 rotatably mounted about a pivot point 66. At the upper free end of the lever 68, a toothed segment 70 is formed, wherein the toothed segment 70 engages under the bias of a spring element 72 in the toothing 62 of the extension member 60, whereby the position of the extension member 60 is locked within the cavity 36 of the handle 18. The toothed segment 70 of the lever 68, the toothing 62 of the extension element 60 and the spring element 72 accordingly together form a locking device. The actuating mechanism 64 is activated by the user pressing the provided on the outer wall 34 actuator 74 against the lower free end of the lever 68, whereupon the sector gear 70 of the actuating mechanism 64 against the biasing force of the spring member 72 from the engagement with the teeth 62 of Extension member 60 moves so that the user can grip the extension member 60 on the base, not shown in Figs. 5 and 6 and can move freely up or down. As soon as the user actuating element 74 of the actuating mechanism 64, the toothed segment 70 is pressed by the spring element 72 into engagement with the toothing 62 of the extension element 60 again, so that the corresponding position of the extension element 60 is locked. The number of possible positions of the extension element 60 is predetermined by the geometry of the toothing 62 and its length.

Also, the embodiment of the handle 18 and the extension device 20 shown in FIGS. 5 and 6 allows a simple and flexible adaptation of the length of the handle 18 to the height of the incised Spritzgutbehälters.

Since the extension elements 38 and 60 shown in FIGS. 3 to 6 are firmly received in the cavity 36 of the handle 18, the extension device 20 is always carried along with the spray gun 10 and can be used accordingly at any time. In addition, the extension device 20 is difficult to get lost. To prevent a complete withdrawal of the extension device 20 from the cavity 36 of the handle 18, a corresponding fuse (not shown) may be provided.

Although an embodiment and variants of the present invention have been previously described in which the length adjustment of the handle takes place in different levels sprayed in stages, it should be understood that the invention is not limited thereto. Thus, the length adjustment can also be made continuously, similar to, for example, in conventional telescopic rods, wherein the locking of a position is then preferably carried out by means of frictional engagement.

Furthermore, it should be clear that the embodiment and variants of the spray gun according to the invention described above only serve as examples and are in no way limiting. Rather, modifications and changes are possible without the The scope of the present invention is defined by the appended claims. In particular, the compressed air generating device need not be integrated in the spray gun. Alternatively, it can also be arranged in a separate unit, the spray gun in this case being connected to the pressure generating device via a compressed air hose.

Claims

R. 322454Patent claims

A spray gun (10) for dispensing an injection molding comprising a housing (16); a receiving device (33) for optionally receiving different levels of sprayed material containers (32a, 32b); a handle (18) for holding the spray gun (10) and an extension means (20) provided on the handle (18) for extending the length of the handle (18) so as to increase the length of the handle (18) to the height (Hi, H ₂ ) of a receiving device (33) arranged Spritzgutbehälters (32 a, 32 b) to adapt that handle (18) and Spritzgutbehälter (32 a, 32 b) together form a storage area for stopping the spray gun (10),

characterized in that

the extension device (20) has at least one extension element (38; 60) which is adjustably fastened in the length direction of the handle (18).

2. Spray gun (10) according to claim 1, characterized in that the extension element (38; 60) in a free end of the handle (18) open cavity (36) of the handle

(18) is recorded.

3. Spray gun (10) according to any one of the preceding claims, characterized in that at least one guide (41; 61) for guiding the adjusting movement of the extension element (38; 60) is provided.

4. Spray gun (10) according to any one of the preceding claims, characterized in that a locking device vorge see, with the aid of which the extension element (38, 60) can be locked in several positions.

5. Spray gun (10) according to claim 4, characterized in that the positions which can be locked by means of the locking device are defined positions.

6. Spray gun (10) according to claim 5, characterized in that the locking device has at least two toothed components (38, 52, 46, 50; 60, 62, 68, 70) which are adapted to be selectively in and out can be brought into engagement with each other, and which define the plurality of positions, wherein in the engaged state of the toothed components (38, 52, 46, 50; 60, 62, 68, 70), a locking takes place.

7. Spray gun (10) according to claim 6, characterized in that the locking device comprises at least one spring element (43; 72), which the toothed components (38, 52, 46, 50; 60, 62, 68, 70) in their engaged state biases.

8. Spray gun (10) according to claim 7, characterized in that the biasing force of the at least one spring element

(43) is chosen so large that when stopping the spray gun (10), the locked position of the extension element (38) is maintained, and is chosen so small that the locking of the extension element (38) by manual force on the extension element (38) is surmountable.

9. A spray gun (10) according to claim 7, characterized in that at least one of the toothed components (68, 70) with an actuating mechanism (64) is operatively connected, which is such that the engaged state of the toothed Components (68, 70, 60, 62) is released in its operation against the biasing force of the spring element (72).

A spray gun (10) according to claim 9, characterized in that the actuating mechanism (64) comprises a lever (68) arranged to provide the force necessary to release the engaged state of the toothed components (68, 70, 60) , 62) is reduced.

11. Spray gun (10) according to claim 9 or 10, characterized in that the actuating mechanism (64) arranged on the handle (18) and accessible from the outside actuating element (74).

12. Spray gun (10) according to one of claims 1 to 4, characterized in that the locking device is designed such that positions of the extension element are infinitely lockable.

13. Spray gun (10) according to claim 12, characterized in that the locking produced by the locking device is non-positively.