EP3261778B1 - Spray gun - Google Patents

Spray gun Download PDF

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Publication number
EP3261778B1
EP3261778B1 EP16712505.3A EP16712505A EP3261778B1 EP 3261778 B1 EP3261778 B1 EP 3261778B1 EP 16712505 A EP16712505 A EP 16712505A EP 3261778 B1 EP3261778 B1 EP 3261778B1
Authority
EP
European Patent Office
Prior art keywords
needle
bushing
head
collet
gun
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16712505.3A
Other languages
German (de)
French (fr)
Other versions
EP3261778A1 (en
Inventor
Marco Negri
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anest Iwata Strategic Center SRL
Original Assignee
Anest Iwata Strategic Center SRL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Anest Iwata Strategic Center SRL filed Critical Anest Iwata Strategic Center SRL
Priority to PL16712505T priority Critical patent/PL3261778T3/en
Publication of EP3261778A1 publication Critical patent/EP3261778A1/en
Application granted granted Critical
Publication of EP3261778B1 publication Critical patent/EP3261778B1/en
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/14—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts
    • B05B15/18—Arrangements for preventing or controlling structural damage to spraying apparatus or its outlets, e.g. for breaking at desired places; Arrangements for handling or replacing damaged parts for improving resistance to wear, e.g. inserts or coatings; for indicating wear; for handling or replacing worn parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2489—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device an atomising fluid, e.g. a gas, being supplied to the discharge device

Definitions

  • the present invention relates to spray guns of the type comprising a body having a handle and a head, an air inlet for supplying air under pressure and a substance inlet for supplying a fluid substance to be sprayed.
  • a spray nozzle is applied to the head and a trigger-operated air valve is associated with the air inlet.
  • the air valve is passed through by a needle for controlling the flow through the spray nozzle, which is also operated by the trigger.
  • the object of the invention is that of resolving the problem related to a quick and easy replacement of the needle of the gun in a constructively simple and functional manner.
  • this object is achieved thanks to the fact that a restraining collet is screwed within the bushing, with which the end of the needle engages axially, said restraining collet being operable in rotation to advance the needle outwards with respect to the bushing from the head of the body, and to release said end from the restraining collet to enable withdrawal of the needle from the gun.
  • the removal of the needle for its periodic replacement can be performed extremely simply and quickly, without requiring disassembly of other components of the gun, except for the nozzle which, moreover, also constitutes an element subject to wear and thus requires replacing together with the needle.
  • the restraining collet and the bushing conveniently have respective surfaces of mutual force-fit engagement to provide blocking of said end of the needle within said restraining collet.
  • a spray gun essentially comprises a body 1 having a handle 2 and a head 3 to which a hand guard 4 is applied.
  • the handle 2 is provided at its base with an inlet connector 5 connectable to a source of air under pressure, and the head 3 is connected to a substance inlet 6 for supplying a fluid substance to be sprayed.
  • numeral 7 indicates a manually-operable trigger for controlling an air valve 8 which controls the opening and closing of a passage 9 connected to the air inlet 5.
  • the air valve 8 contrasts axially against a bushing 10 axially movable within the body 1, on the opposite side to the head 3, against the action of an elastic system 11.
  • Numeral 12 indicates a needle which extends between the bushing 10 and a spray nozzle 13, applied in a removable manner to the head 3.
  • the function of the needle 12 is that of controlling the flow of fluid substance sprayed through the nozzle 13.
  • the needle 12 passes through the air valve 8, which is hollow, and is axially displaceable together therewith, due to the effect of operating the trigger 7.
  • the end of the needle 12 opposite to the nozzle 13, indicated by 14 in Figure 9 engages within a restraining collet 15 inserted coaxially and rotatably with threaded coupling 16 within the bushing 10.
  • the threaded coupling 16 is such so that the restraining collet 15 operates in a screw-like manner and the bushing 10 operates in a nut-like manner.
  • the end 14 of the needle 12 is inserted axially into a blind hole 17 of the restraining collet 15, at which said collet 15 has a tapered outer portion 18 configured to cooperate with a corresponding internal tapered portion 19 of the bushing 10.
  • the end of the restraining collet 15 opposite to the air valve 8 has a seat 20 accessible from the outside, following the removal of a cap 21, for the insertion of an Allen key B through which the screwing or unscrewing of the restraining collet 15 is controlled relative to the bushing 10.
  • the nozzle 13 is unscrewed and removed from the head 3 of the body 1 ( Figure 3 ) and the removal of the cap 21 can then be carried out ( Figure 4 ).
  • the Allen key B is introduced within the seat 20 of the restraining collet 15 ( Figure 5 ), which then operates the screwing rotation of the restraining collet 15 relative to the bushing 10. Due to the effect of this maneuver, the restraining collet 15 advances in the direction of the head 3 of the body 1 and in so doing moves the needle 12 in the same way, which in this way is made to protrude beyond the head 3.
  • This maneuver also causes the disengagement between the tapered surfaces 18 and 19, so as to loosen the force-fit engagement of the end 14 of the needle 12 within the hole 17.
  • the needle 12 can then be pulled and extracted outside of the head 3, as represented in Figure 7 , to be replaced.
  • the new needle 12 is inserted through the head 3 of the body 1, and then through the air valve 8 to engage the hole 17 of the restraining collet 15 with its end 14.
  • the restraining collet 15 is then rotated in the unscrewing direction relative to the bushing 10, in order to engage the tapered surfaces 18, 19 with each other again, thus producing the forced blocking of the end 14 of the needle 12 relative to the restraining collet 15.

Landscapes

  • Nozzles (AREA)

Description

    Field of the invention
  • The present invention relates to spray guns of the type comprising a body having a handle and a head, an air inlet for supplying air under pressure and a substance inlet for supplying a fluid substance to be sprayed. A spray nozzle is applied to the head and a trigger-operated air valve is associated with the air inlet. The air valve is passed through by a needle for controlling the flow through the spray nozzle, which is also operated by the trigger.
    • State of the art
  • In spray guns of this type, for example, as generally described in the document US-3,482,781 , the spray nozzle and the needle must be periodically replaced, as they are subject to wear. Consequently, the needle is secured in a removable manner, at its end opposite to the nozzle, to a bushing axially movable in the body of the gun together with the air valve. Traditionally, the disassembly operation of the needle is relatively long and complex, as it requires disassembling the various components, which also usually includes the trigger.
  • To try to resolve this problem, solutions have been proposed, such as the one described in the document WO-2010/080365 , which entail, however, additional structural complications.
    • Summary of the invention
  • The object of the invention is that of resolving the problem related to a quick and easy replacement of the needle of the gun in a constructively simple and functional manner.
  • According to the invention, this object is achieved thanks to the fact that a restraining collet is screwed within the bushing, with which the end of the needle engages axially, said restraining collet being operable in rotation to advance the needle outwards with respect to the bushing from the head of the body, and to release said end from the restraining collet to enable withdrawal of the needle from the gun.
  • Thanks to this solution idea, the removal of the needle for its periodic replacement can be performed extremely simply and quickly, without requiring disassembly of other components of the gun, except for the nozzle which, moreover, also constitutes an element subject to wear and thus requires replacing together with the needle.
  • According to the invention, the restraining collet and the bushing conveniently have respective surfaces of mutual force-fit engagement to provide blocking of said end of the needle within said restraining collet.
    • Brief description of the drawings
  • Additional features of the invention will become apparent from the detailed description which follows, with reference to the attached drawings provided purely by way of non-limiting example, in which:
    • Figure 1 is a perspective view of an embodiment of a spray gun according to the invention,
    • Figures 2, 3 and 4 are analogous views to Figure 1, which exemplify the modes of disassembly of the needle of the gun in respective successive steps,
    • Figure 5 is a perspective dorsal view of the gun showing an additional step during disassembly of the needle,
    • Figure 6 is a front perspective view on an enlarged scale of the gun in the step corresponding to Figure 5,
    • Figure 7 is a perspective view analogous to Figures 1 to 4 which shows the gun following removal of the needle,
    • Figure 8 is a view analogous to Figure 6, on an enlarged scale and partially cross-sectioned, and
    • Figure 9 shows a part of Figure 8, further cross-sectioned.
    Detailed description of the invention
  • Referring initially to Figure 1, a spray gun according to the invention essentially comprises a body 1 having a handle 2 and a head 3 to which a hand guard 4 is applied. The handle 2 is provided at its base with an inlet connector 5 connectable to a source of air under pressure, and the head 3 is connected to a substance inlet 6 for supplying a fluid substance to be sprayed.
  • Referring now in greater detail to Figure 8, numeral 7 indicates a manually-operable trigger for controlling an air valve 8 which controls the opening and closing of a passage 9 connected to the air inlet 5. The air valve 8 contrasts axially against a bushing 10 axially movable within the body 1, on the opposite side to the head 3, against the action of an elastic system 11.
  • Numeral 12 indicates a needle which extends between the bushing 10 and a spray nozzle 13, applied in a removable manner to the head 3. The function of the needle 12 is that of controlling the flow of fluid substance sprayed through the nozzle 13.
  • As is illustrated in detail in Figure 9, the needle 12 passes through the air valve 8, which is hollow, and is axially displaceable together therewith, due to the effect of operating the trigger 7.
  • According to the unique characteristic of the invention, the end of the needle 12 opposite to the nozzle 13, indicated by 14 in Figure 9, engages within a restraining collet 15 inserted coaxially and rotatably with threaded coupling 16 within the bushing 10. The threaded coupling 16 is such so that the restraining collet 15 operates in a screw-like manner and the bushing 10 operates in a nut-like manner.
  • Still with reference to Figure 9, the end 14 of the needle 12 is inserted axially into a blind hole 17 of the restraining collet 15, at which said collet 15 has a tapered outer portion 18 configured to cooperate with a corresponding internal tapered portion 19 of the bushing 10.
  • The end of the restraining collet 15 opposite to the air valve 8 has a seat 20 accessible from the outside, following the removal of a cap 21, for the insertion of an Allen key B through which the screwing or unscrewing of the restraining collet 15 is controlled relative to the bushing 10.
  • The sequence of disassembly of the needle 12 for its periodic replacement is exemplified in Figures 1 to 7.
  • Following the removal of the hand guard 4 (Figure 2), the nozzle 13 is unscrewed and removed from the head 3 of the body 1 (Figure 3) and the removal of the cap 21 can then be carried out (Figure 4). The Allen key B is introduced within the seat 20 of the restraining collet 15 (Figure 5), which then operates the screwing rotation of the restraining collet 15 relative to the bushing 10. Due to the effect of this maneuver, the restraining collet 15 advances in the direction of the head 3 of the body 1 and in so doing moves the needle 12 in the same way, which in this way is made to protrude beyond the head 3. This maneuver also causes the disengagement between the tapered surfaces 18 and 19, so as to loosen the force-fit engagement of the end 14 of the needle 12 within the hole 17. The needle 12 can then be pulled and extracted outside of the head 3, as represented in Figure 7, to be replaced.
  • For replacement, the new needle 12 is inserted through the head 3 of the body 1, and then through the air valve 8 to engage the hole 17 of the restraining collet 15 with its end 14. Through the Allen key B, the restraining collet 15 is then rotated in the unscrewing direction relative to the bushing 10, in order to engage the tapered surfaces 18, 19 with each other again, thus producing the forced blocking of the end 14 of the needle 12 relative to the restraining collet 15.
  • It is apparent from above that the operations of disassembly and reassembly of the needle 12 can be carried out very quickly and easily without requiring the removal of other parts of the gun, apart from the spray nozzle 13 which is, however, also an element subject to wear, and therefore requires periodic replacement like the needle 12.
  • Of course, the details of construction and the embodiments may be widely varied with respect to those described and illustrated, without departing from the scope of the present invention as defined by the following claims.

Claims (2)

  1. A spray gun comprising a body (1) having a handle (2) and a head (3), an air inlet (5) for the supply of air under pressure, a substance inlet (6) for the supply of a fluid substance to be sprayed, a spray nozzle (13) releasably secured to the head (2), an air valve (8) associated with the air inlet (5), a needle (12) for controlling the flow through the spray nozzle (13), and a trigger (7) for operating the air valve (8) and the needle (12), wherein the needle (12) passes through the air valve (8) and is releasably fixed at its end (14) opposite to the spray nozzle (13) to a bushing (10), which is axially movable within the gun body (1) characterized in that a restraining collet (15) is screwed within said bushing (10) with which said end (14) of the needle (12) is axially engaged, said restraining collet (15) being operable in rotation to advance the needle (12) outwards with respect to the bushing (10) from the head (2) of the body (1) and release said end (14) from the restraining collet (15) so as to enable withdrawal of said needle (12) from the gun.
  2. Spray gun according to claim 1, characterized in that the restraining collet (15) and the bushing (10) have respective surfaces of mutual force-fit engagement (18, 19) to provide blocking of said end (14) of the needle (12) within said restraining collet (15) .
EP16712505.3A 2015-02-26 2016-02-22 Spray gun Active EP3261778B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16712505T PL3261778T3 (en) 2015-02-26 2016-02-22 Spray gun

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20150138 2015-02-26
PCT/IB2016/050938 WO2016135612A1 (en) 2015-02-26 2016-02-22 Spray gun

Publications (2)

Publication Number Publication Date
EP3261778A1 EP3261778A1 (en) 2018-01-03
EP3261778B1 true EP3261778B1 (en) 2018-11-21

Family

ID=52815196

Family Applications (2)

Application Number Title Priority Date Filing Date
EP15197146.2A Withdrawn EP3061530A1 (en) 2015-02-26 2015-11-30 Spray gun
EP16712505.3A Active EP3261778B1 (en) 2015-02-26 2016-02-22 Spray gun

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP15197146.2A Withdrawn EP3061530A1 (en) 2015-02-26 2015-11-30 Spray gun

Country Status (4)

Country Link
EP (2) EP3061530A1 (en)
ES (1) ES2702083T3 (en)
PL (1) PL3261778T3 (en)
WO (1) WO2016135612A1 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1613588A (en) * 1923-12-26 1927-01-04 De Vilbiss Mfg Co Air brush
US2146416A (en) * 1935-10-31 1939-02-07 Binks Mfg Co Spray gun nozzle
US2934246A (en) * 1953-05-25 1960-04-26 Sharpe Mfg Co Paint spray gun
US3482781A (en) 1968-03-18 1969-12-09 Sharpe Mfg Co Spray gun with pressure gauge feature
AU2009335963B2 (en) 2008-12-18 2014-10-09 Graco Minnesota Inc. Tooless needle change spray gun

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
PL3261778T3 (en) 2019-04-30
WO2016135612A1 (en) 2016-09-01
EP3061530A1 (en) 2016-08-31
EP3261778A1 (en) 2018-01-03
ES2702083T3 (en) 2019-02-27

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