Frame and housing for trigger head dispensing device

Abstract

A frame (8a, 8b) for a trigger head (6a, 6b) of a liquid product dispensing device (1a, 1b), the frame comprising: a frame base (18); a pressure chamber (26); an inlet duct (30); an outlet duct (42); a distribution duct (36); a shoulder (52) consisting of a shoulder wall (54) projecting at the back from the rear region of the frame base (18) to form a support structure for the user's hand gripping the head (6a, 6b) when dispensing the product. The shoulder (52) comprises a rear coupling (60) for the housing (100) of the head (1a, 1b).

Description

Technical Field

[0001] The invention belongs to the field of triggered dispensing devices for delivering products for use in, for example, household hygiene, air freshening, personal hygiene and care, clothing care and the like. Background Art

[0002] Such devices are very popular and appreciated by users due to their practicality, versatility and the possibility of multiple uses by appropriately refilling the bottle with the product. Hundreds of millions of such devices are produced every year.

[0003] To better meet consumer needs, there are multiple types of trigger head dispensing devices that differ in, for example, the type of product that can be dispensed, the volume of the dispensed product, the type of connection between the trigger dispensing head and the bottle, and other further variations.

[0004] Each type of trigger head dispensing device includes multiple components that are usually designed and manufactured for that specific type of trigger head dispensing device. Therefore, manufacturing companies that offer multiple types of options to customers find themselves having to manage countless different components, resulting in inconveniences in production, storage, transportation and assembly.

[0005] The object of the present invention is to meet the needs of the industry and to overcome the disadvantages discussed above with reference to the prior art. Specifically, the object of the present invention is to provide: a first type of trigger-type dispensing head that can be applied by a ring nut that is threaded onto a bottle; and a second type of trigger-type dispensing head that can be applied by a bayonet connection to the bottle, both variants having a plurality of common parts to minimize the total number of parts. Summary of the invention

[0006] The object of the present invention is to meet the needs of the industry and overcome the disadvantages discussed above with reference to the prior art. Specifically, the object of the present invention is to provide: a first type of trigger-type dispensing head that can be applied by a ring nut that is threaded onto a bottle; and a second type of trigger-type dispensing head that can be applied by a bayonet connection to the bottle, both having a plurality of common parts to minimize the total number of parts.

[0007] This object is achieved by a frame for a trigger-type dispensing head according to claim 1. The dependent claims disclose further advantageous embodiments of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The characteristics and advantages of the frame according to the invention will become apparent from the following description given by way of non-limiting example with reference to the figures of the accompanying drawings in which:

[0009] -Figure 1a depicts a trigger-type dispensing device with a bayonet connection;

[0010] - Figure 1b depicts a trigger-type dispensing device with a threaded connection;

[0011] - Figure 2a yes Figure 1a A cross-sectional view of a dispensing head with a trigger-type dispensing head with a bayonet connection;

[0012] - Figure 2b yes Figure 1b A cross-sectional view of a dispensing head with a threaded trigger-type dispensing head;

[0013] - Figure 3a Depicted Figure 2a A frame for a trigger-type dispensing head with a bayonet connection;

[0014] - Figure 3b Depicted Figure 2b A frame with a threaded trigger dispenser head;

[0015] - Figure 4a yes Figure 3a A side view of the frame in FIG.

[0016] - Figure 4b yes Figure 3b A side view of the frame in FIG.

[0017] - Figure 5 Schematically showing the assembly of a housing onto a dispensing head with a bayonet connection and the assembly of a housing onto a dispensing head with a threaded connection;

[0018] - Figure 6 A housing according to the invention is shown;

[0019] - Figure 7 yes Figure 6 A side view of the housing in FIG.

[0020] - Figure 8 Observed from below Figure 7 A plan view of the housing in FIG. DETAILED DESCRIPTION

[0021] Description of the First Embodiment of the Present Invention

[0022] According to one embodiment ( Figure 1a , Figure 2a , Figure 3a , Figure 4a), the trigger-type dispensing head 1a comprises: a bottle 2 having a neck 4a and a bottle internal chamber 3; and a trigger-type dispensing head 6a with a bayonet connection, which is applied to the neck 4a by means of the bayonet connection.

[0023] For the bayonet connection, the neck 4a has a plurality of neck ridges forming a ramp and a channel for snap-fitting to the dispensing head 6a. An exemplary embodiment of a neck for a bayonet connection is shown in document WO-A1-2019 / 092517 in the name of the applicant.

[0024] The head 6a includes a frame 8a for supporting components whose function is to dispense a product, and a housing 100 that can be applied to the frame 8a to cover the frame.

[0025] frame

[0026] The frame 8a comprises an annular skirt 10a constituted by a cylindrical skirt wall 12a and having a centre axis Z and a predetermined axial extension along said centre axis Z.

[0027] Preferably, the skirt 10a has at least one skirt window 14a, such as a pair of skirt windows 14a, through the thickness of the skirt wall 12a, the at least one skirt window preferably being symmetrical.

[0028] The skirt 10a also comprises at least one flexible fin 16a for snap-insertion onto the neck 4a and engagement with the neck ridge of the neck 4a of the bottle 2. Preferably, three fins 16a are envisaged, angularly spaced and preferably arranged at the lower edge of the respective skirt window 14a.

[0029] The frame 8a also comprises a frame base 18 extending substantially orthogonally to the central axis Z, from the bottom of which the skirt 10a projects.

[0030] The frame 8a also comprises an annular sealing wall 20a coaxial with the skirt wall 12a, projecting axially from the bottom of the frame base 18 and radially inwardly of the skirt wall 12a and the fins 16a to form a liquid seal when the head 6a is applied to the neck 4a of the bottle 2.

[0031] The frame 8a also includes an inlet duct 22 protruding axially from the bottom of the frame base 18 (eg offset relative to the central axis Z) and preferably a vent tube 24a protruding axially from the bottom of the frame base 18 (eg offset relative to the central axis Z).

[0032] A cylindrical pressure chamber 26 is also formed in the frame 8a, which has a chamber axis X orthogonal to the central axis Z and is annularly delimited by a chamber wall 28 and supported by the frame base 18. The pressure chamber 26 has an opening 26' for the piston at the front; the pressure chamber 26 is delimited at the back by a chamber bottom 26".

[0033] An entry pipe 30 is also formed in the frame 8a for connecting the bottle chamber 3 with the pressure chamber 26 fluid; for example, the entry pipe 30 includes: a vertical entry section 32 parallel to the center axis Z, which extends at least partially into the entry conduit 22 and into the bottle chamber 3; and a horizontal entry section 34 parallel to the chamber axis X, which is connected to the vertical entry section 32 and enters the pressure chamber 26.

[0034] A dispensing duct 36 for dispensing the product into the external environment is also formed in the frame 8a, the dispensing duct having an extension along a dispensing axis Y spaced apart from and parallel to the chamber axis X between an inner end 38 and an outer end 40 for dispensing the product. The dispensing duct 36 is delimited by an annular dispensing wall 37 having an extension along the dispensing axis Y.

[0035] The chamber axis X and the dispensing axis Y lie on the same imaginary sagittal plane Ps of the frame 8a and / or of the dispensing head 1a; preferably, the central axis Z also lies on said sagittal plane Ps.

[0036] An outlet pipe 42 is also formed in the frame 8a for connecting the pressure chamber 26 to the distribution pipe 36 fluid; for example, the outlet pipe 42 includes: a horizontal outlet section 44 parallel to the chamber axis X, which enters the pressure chamber 26; and a vertical outlet section 46 parallel to the center axis Z, which is connected to the horizontal outlet section 44 and to the inner end 38 of the distribution pipe 36.

[0037] Furthermore, the vertical outlet section 46 has an outlet extension 48 which projects above the dispensing wall 37 and is delimited by an outlet pipe 50 .

[0038] The frame 8a also comprises a shoulder 52 formed by a shoulder wall 54 which projects at the back from a rear region of the frame base 18 to form a support structure for the hand of a user gripping the dispensing head when dispensing product.

[0039] In particular, the shoulder wall 54 has a preferably arcuate lower surface 56 and an upper surface 58 opposite the lower surface against which the area between the thumb and index finger of the hand rests.

[0040] The shoulder 52 includes a rear connecting piece 60 of the shell 100 for the head 1a, which is preferably composed of a hook wall 62 and a facing wall 66, wherein the hook wall extends upward from the upper surface 58 and has, for example, teeth 64, and the facing wall extends upward from the upper surface 58, faces the hook wall 62 and is flexible to form a snap connection with the shell 100.

[0041] Furthermore, preferably, the shoulder 52 includes a rear support 68 constituted by a support wall 70 protruding upward from the upper surface 58 of the shoulder wall 54 to support the housing 100 .

[0042] The frame 8a also includes an intermediate coupling 72 for the housing 100, which is supported above by the distribution wall 37, arranged at the inner end 38 of the distribution duct 36 and preferably located in front of the outlet pipe 50. Preferably, the intermediate coupling 72 is composed of a hook-shaped wall 74 and a facing wall 76, the hook-shaped wall protruding upward from the distribution wall 37, and the facing wall protruding upward from the distribution wall 37, facing the hook-shaped wall 74 and being flexible to form a snap connection with the housing 100.

[0043] The outlet pipe 50 is arranged between the rear coupling piece 60 and an intermediate coupling piece 72 protruding upward from the distribution wall 37 .

[0044] Furthermore, the frame 8a preferably comprises an intermediate support 78 for the housing 100, which is supported above by the distribution wall 37, arranged between the inner end 38 and the outer end 40 of the distribution duct 36 and preferably located in front of the intermediate coupling 72. For example, the intermediate support 78 comprises a cross-shaped support wall 80.

[0045] The frame 8 a also comprises a front coupling 82 for the housing 100 , supported above by the distribution wall 37 , arranged at the opening 26 ′ of the pressure chamber 26 and preferably in front of the intermediate support 78 .

[0046] Preferably, the front coupling 82 comprises a pair of couplings 84 protruding upward from the distribution wall 37 and arranged symmetrically about the sagittal plane Ps of the frame 8a. Preferably, the coupling 84 is composed of a hook-shaped wall 86 and facing walls 88', 88", the hook-shaped wall being located, for example, on the sagittal plane Ps, the facing wall protruding upward from the distribution wall 37, facing the hook-shaped wall 84 and being flexible to form a snap connection with the housing 100. Therefore, the two hook-shaped walls 88', 88" face each other and are parallel, and are located on opposite sides of the sagittal plane Ps.

[0047] Furthermore, preferably, the frame 8a comprises a front support 90 for the housing 100, supported above by the distribution wall 37, arranged at the outer end 40 of the distribution duct 36 and preferably in front of the front coupling 82. For example, the front support 90 constitutes a support wall 92, which is located on an imaginary plane orthogonal to the distribution axis Y.

[0048] Preferably, the frame 8a is made in one piece from a plastic material, for example from a polyolefin polymer material such as polypropylene (PP) or recycled polypropylene (rPP), for example by injection moulding.

[0049] case

[0050] The housing 100 is made of thin walls which form a shell which covers the distribution wall 37, the pressure chamber 26 and the associated chamber wall 28 as well as the shoulder 52 up to the frame base 18. The skirt 10a is not covered.

[0051] The housing 100 is generally symmetrical about the sagittal plane Ps and is composed of a front cover 101, which spans the distribution duct 36a and is formed by a right front wall 102 and a left front wall 104 connected at the top, and a rear cover 103, which is arranged above the shoulder 52 and is formed by a right rear wall 106 and a left rear wall 108 connected at the top. The front portion of the rear cover 103 is connected to the rear edge of the front cover 101.

[0052] The front cover 101 covers the distribution wall 37 and the pressure chamber 26 from the side and from above; the rear cover 103 covers the shoulder 52 from above.

[0053] The housing 100 comprises a rear counter-coupler 160 adapted to snap-connect with the rear coupler 60 of the frame 8a, which rear counter-coupler protrudes inwardly from the rear cover 103. For example, the rear counter-coupler 160 comprises a hooked counter wall 162 terminating in a blunt counter tooth 164 for facilitating snap-insertion between the hooked counter wall 62 and the facing wall 66 of the rear coupler 60 of the shoulder 52. Preferably, the hooked counter wall 162 is orthogonal to the central axis Z, for example symmetrical about the sagittal plane Ps.

[0054] Furthermore, preferably, the housing 100 comprises a rear counter-support 168 which projects inwardly from the rear cover 103 and which preferably follows a stepped shape so as to rest on the rear support 68 of the shoulder 52 .

[0055] The housing 100 further comprises a cap element 151 which is suitable for forming a cap for the outlet pipe 50 of the frame 8a and which protrudes inwardly from the front cover 101. For example, the cap element 151 constitutes a tubular cap 153 which is open at the open end and is closed at the bottom by a cap region 155 of the housing 100, in particular by a cap region of the front cover 101. Preferably, the cap element 151 is symmetrical about the sagittal plane Ps.

[0056] The housing 100 further comprises an intermediate counter-coupling 172 suitable for forming a snap connection with an intermediate counter-coupling 172 of the frame 8a, which intermediate counter-coupling protrudes inwardly from the front cover 101. For example, the intermediate counter-coupling 172 constitutes a hooked counter-wall 174 terminating in a blunt counter-tooth 175 for facilitating snap-in insertion between the hooked counter-wall 74 and the facing wall 76 of the intermediate coupling 72 of the shoulder 52. Preferably, the hooked counter-wall 174 is orthogonal to the central axis X, for example asymmetrical with respect to the sagittal plane Ps.

[0057] The housing 100 further comprises a front counter-coupler 182 suitable for forming a snap-fit ​​connection with the front coupler 82 of the frame 8 a , which front counter-coupler protrudes inwardly from the front cover 101 and is located in front of the intermediate counter-coupler 172 .

[0058] Preferably, the front reverse coupling 182 comprises a pair of reverse couplings 184 arranged symmetrically about the sagittal plane Ps. Each reverse coupling 184 constitutes a hooked reverse wall 186 terminating in a blunt reverse tooth 187 for facilitating snap-in insertion between the hooked wall 86 and the facing walls 88', 88" of the coupling 84 of the frame 8a. Preferably, the hooked reverse walls 186 face each other and are parallel and are located on opposite sides of the sagittal plane Ps.

[0059] Preferably, the housing 100 is made of a plastic material in one piece, for example a polyolefin polymer material such as polypropylene (PP) or recycled polypropylene (rPP).

[0060] Other components

[0061] The head 6a also comprises a piston 122 which is slidably sealed in the pressure chamber 26 along said chamber axis X. Preferably, the piston 122 is made in one piece from a plastic material, for example a polyolefin polymer material such as polypropylene (PP), recycled polypropylene (rPP) or high-density polyethylene (HDPE).

[0062] The head 6 a also comprises a trigger 124 suitable for being manually actuated, preferably applied to the frame 8 a and operatively connected to the piston 122 to actuate the latter in translation within the pressure chamber 26 .

[0063] The head 6a further comprises elastic return means adapted to permanently bias the piston 122 towards the initial position. Preferably, the return means comprises a flexible return portion of the trigger 124. In other words, the return means is integrally formed into the trigger 124. Preferably, the trigger 124 is made in one piece from a plastic material, for example from a polyolefin polymer material such as polypropylene (PP) or recycled polypropylene (rPP).

[0064] Preferably, the head 6a also comprises a fixed or rotating nozzle 126 and the nozzle is applied to the free end of the dispensing tube 36 for changing the spray pattern of the dispensed jet or allowing the dispensing tube to be closed and hindering the dispensing of the product. Preferably, the nozzle 126 is made in a single piece of plastic material, for example, a polyolefin polymer material such as polypropylene (PP).

[0065] The head 6a also comprises valve means adapted to regulate the flow of product from the bottle chamber to the pressure chamber and from the pressure chamber to the external environment. Preferably, the valve means comprises a valve body 140, made in one piece, for example by injection molding, of a polyolefin polymer material, for example low density polyethylene (LDPE) or ethylene thermoplastic octene (TPEO), housed in the pressure chamber 26 at the chamber bottom 26″ to cooperate with the inlet conduit 30 and the outlet conduit 42.

[0066] Head Assembly

[0067] The assembly of the trigger head is preferably fully automatic and comprises, in sequence: machine loading of the frame, mounting of the valve body into the pressure chamber, mounting of the piston to the frame, mounting of the trigger to the frame, mounting of the nozzle to the frame, mounting of the housing to the frame.

[0068] The housing 100 can be applied to the frame 8a in a vertical direction, that is to say it is applied to the frame in a vertical direction by translation parallel to the central axis Z.

[0069] When the housing 100 is applied to the frame 8a:

[0070] - coupling the rear counter-connector 160 of the housing 100 to the rear counter-connector 60 of the frame 8a; in particular, snap-inserting the hooked counter-connector wall 162 between the hooked wall 62 and the facing wall 66 of the shoulder 52;

[0071] - coupling the cap element 151 of the housing 100 to the outlet pipe 50 of the frame 8a to close the outlet pipe; in particular, inserting the tubular cap 153 into the outlet pipe 50;

[0072] - coupling the intermediate counter-coupling 172 of the housing 100 to the intermediate coupling 72 of the frame 8a; in particular, snap-inserting the hooked counter-coupling wall 174 between the hooked wall 74 and the facing wall 76 of the frame 8a;

[0073] - Connect the front counter-connection 182 of the housing 100 to the front connector 82 of the frame 8a; specifically, snap-insert the hooked counter-wall 186 of the housing 100 between the hooked wall 86 and the corresponding facing wall 88', 88" of the frame 8a.

[0074] Therefore, the housing 100 is supported by the frame 8a, specifically:

[0075] - the rear counter-support 168 of the housing 100 rests on the rear support 68 of the shoulder 52;

[0076] - the intermediate region 78 ′ of the housing 100 , arranged between the intermediate counter-coupling 172 and the front counter-coupling 182 , rests on the intermediate support 78 of the frame 8 a ;

[0077] The front region 90 ′ of the housing 100 , which is arranged in front of the front counter-coupling 182 , rests on the front support 90 of the frame 8 a .

[0078] Description of a preferred embodiment of the present invention

[0079] According to another embodiment ( Figure 1b , Figure 2b , Figure 3b , Figure 4b ), the trigger-type dispensing head 1b comprises: a bottle 2 having a neck 4b and a bottle internal chamber 3; and a trigger-type dispensing head 6b with a threaded connection, which is applied to the neck 4b by means of the threaded connection.

[0080] For this threaded connection, the neck 4b has an external thread for screwing the ring nut 150 of the head 6b. The ring nut 150 can be screwed by rotating it around the central axis Z.

[0081] The head 6b comprises a frame 8b for supporting the components whose function is to dispense the product. The frame 8b comprises a frame base 18 extending substantially orthogonally to the central axis Z.

[0082] The frame 8 b also comprises an annular peripheral sealing wall 20 b coaxial with the central axis Z, which protrudes axially from the bottom of the frame base 18 and to which the annular nut 150 is coupled.

[0083] In an embodiment variant (not shown), the frame 8b comprises a second annular sealing wall, located inside the first annular sealing wall and coaxial with the central axis Z, so as to form a head seal on the neck of the bottle.

[0084] The frame 8 b also comprises an inlet duct 22 b which projects axially from the bottom of the frame base 18 , for example offset relative to the central axis Z.

[0085] Apart from the features described here, the frame 8b is identical in structure and function to the frame 8a of the bayonet-connection head 1a. In particular, the frame 8b of the head 1b with threaded connection does not have a skirt 10a.

[0086] The other components described with respect to the bayonet-connection head 1 a are also identical in structure and function to the corresponding components of the head 1 b with a threaded connection: housing 100 , piston 122 , trigger 124 , nozzle 126 , valve body 140 .

[0087] The assembly of the head 1 b with threaded connection is carried out as described above for the bayonet connection head 1 a , with the additional inclusion of mounting the ring nut to the frame.

[0088] Creatively, the present invention meets the needs of the field and overcomes the above-mentioned disadvantages, in particular, using the same parts (excluding the frame) and the same assembly line to manufacture the bayonet-type head or the head with a threaded connection. This reduces the number of total parts and enables the use of the same assembly line.

[0089] Furthermore, advantageously, the dispenser head according to the invention is highly recyclable, since 98% by weight of the components used can be moulded from PP; the main valve body can be moulded from LDPE or TPEO, but due to the low weight of the main valve body, the dispenser head can still be considered as a single material in accordance with industry regulations.

[0090] Furthermore, advantageously, the heavier components (ie, trigger, piston, nozzle, frame, housing and ring nut) which together constitute 70% of the weight of the head can be moulded from recycled polypropylene (rPP).

[0091] Furthermore, advantageously, the weight of the head according to the invention is extremely controlled, the Applicant estimating that the weight of the head is approximately 20% lighter than similar devices on the market.

[0092] It is obvious that those skilled in the art can make changes to the dispensing head, and in particular to the valve body of the valve device, to meet possible needs. These modifications are all included in the protection scope defined by the attached claims.

Claims

1. A frame (8a, 8b) for a trigger head (6a, 6b) of a liquid product dispensing device (1a, 1b), the frame comprising: - a frame base (18), orthogonal to the central axis (Z); - a cylindrical pressure chamber (26) having a chamber axis (X) orthogonal to the central axis (Z) and being annularly delimited by a chamber wall (28) and located above the frame base (18) and having an opening (26') at the front and a chamber bottom (26") at the back; an inlet duct (30), an outlet duct (42) and a distribution duct (36) having an extension along a distribution axis (Y) spaced apart from and parallel to the chamber axis (X) and delimited by a distribution wall (37); - a shoulder (52) formed by a shoulder wall (54) which projects at the back from the rear region of the frame base (18) to form a support structure for the hand of a user gripping the head (6a, 6b) when dispensing the product; The shoulder (52) comprises a rear coupling member (60) for the housing (100) of the head (1a, 1b), wherein the rear coupling member is adapted to form a snap-fit ​​connection with the housing (100).

2. The frame according to claim 1, wherein: The shoulder wall (54) has an arcuate lower surface (56) and an upper surface (58) opposite the lower surface, the lower surface being adapted to support the area between the thumb and index finger of a hand.

3. The frame according to claim 2, wherein: The rear coupling (60) includes a hook-shaped wall (62) and a facing wall (66), the facing wall facing the hook-shaped wall (62) and being flexible to form a snap connection with the housing (100).

4. A frame according to any one of the preceding claims, wherein: The shoulder (52) includes a rear support (68) for supporting the housing (100).

5. Frame according to any one of the preceding claims, comprising an outlet pipe (50) defining an extension of the outlet duct (42) and arranged in front of the rear coupling (60).

6. A frame according to any one of the preceding claims, comprising an intermediate connector (72) for the housing (100), which is arranged in front of the outlet pipe (50) and is suitable for forming a snap connection with the housing (100).

7. The frame according to claim 6, comprising an intermediate support member (78) for supporting the housing (100), the intermediate support member being arranged in front of the intermediate link (72).

8. A frame according to claim 6 or 7, comprising a front connecting piece (82) for the shell (100), which is arranged in front of the intermediate connecting piece (72) and is suitable for forming a snap connection with the shell (100).

9. The frame according to claim 8, comprising a front support member (90) for supporting the housing (100), the front support member being arranged in front of the front link (82).

10. A frame according to any one of the preceding claims, made in one piece from a plastic material, such as a polyolefin polymer material, such as polypropylene (PP) or recycled polypropylene (rPP).

11. A frame (6a) according to any one of the preceding claims, comprising an annular skirt (10a) formed by a cylindrical skirt wall (12a), the annular skirt protruding from the bottom of the frame base (18), coaxial with the central axis (Z), and comprising at least one flexible fin (16a) inside for snap-fitting onto the neck (4a) of the bottle (2) of the dispensing device (1a).

12. The frame according to claim 11, wherein: The skirt (10a) has at least one skirt window (14a) passing through the thickness of the skirt wall (12a), and the fin (16a) is arranged at the lower edge of the skirt window (14a).

13. A housing (100) for a trigger head (6a, 6b) of a liquid product dispensing device (1a, 1b), the housing being adapted to be applied to a frame (8a, 8b) according to any one of the preceding claims.

14. A trigger head (6a, 6b) for a liquid product dispensing device (1a, 1b), comprising: - a frame (8a, 8b) according to any one of claims 1 to 12; - A housing (100) according to claim 13, which is applied by snapping onto the frame (8a, 8b).

15. The trigger head according to claim 14, wherein: The housing extends to the frame base (18).

16. A housing (100) for a trigger head (6a, 6b) of a liquid product dispensing device (1a, 1b), the housing comprising: - a front cover (101) formed by a right front wall (102) and a left front wall (104) connected at the top; and a rear cover (103) formed by a right rear wall (106) and a left rear wall (108) connected at the top and the rear, wherein the front of the rear cover (103) is connected to the rear edge of the front cover (101); - a rear counter-connector (160) adapted to snap-connect with the frame (8a, 8b) of the trigger head (6a, 6b), and the rear counter-connector protrudes inwardly from the rear cover (103).

17. The housing according to claim 16, wherein: The rear reverse coupling (160) includes a hooked reverse wall (162) terminating in a blunt reverse tooth (164).

18. A housing according to claim 16 or 17, comprising a rear counter-support (168) protruding inwardly from the rear cover (103) to support the frame (8a, 8b).

19. A housing according to any one of claims 16 to 18, comprising a cap element (151) adapted to form a cap for an outlet pipe (50) of the frame (8a, 8b) and projecting inwardly from the front cover (101).

20. A housing according to any one of claims 16 to 19, comprising an intermediate counter-coupling (172) for snap-connection to the frame (8a, 8b), the intermediate counter-coupling protruding inwardly from the front cover (101).

21. The shell according to claim 20 further comprises a front reverse connecting piece (182) for snap-connecting to the frame (8a, 8b), wherein the front reverse connecting piece protrudes inwardly from the front cover (101) and is located in front of the middle reverse connecting piece (172).

22. A housing according to any one of claims 16 to 21, made in one piece from a plastic material, such as a polyolefin polymer material, such as polypropylene (PP) or recycled polypropylene (rPP).

23. A frame (8a, 8b) for a trigger head (6a, 6b) of a liquid product dispensing device (1a, 1b), the frame being suitable for application to a housing (100) according to any one of claims 16 to 22.

24. A trigger head (6a, 6b) for a liquid product dispensing device (1a, 1b), comprising: - a housing (100) according to any one of claims 15 to 21; - A frame (8a, 8b) according to claim 23, which is applied by snapping onto the housing (100).

25. The trigger head according to claim 24, wherein: The housing (100) extends up to a base frame (18) of the frames (8a, 8b).

26. A trigger head (6a, 6b) for a liquid product dispensing device (1a, 1b), comprising: - a frame (8a, 8b) according to any one of claims 1 to 12; - A housing (100) according to any one of claims 16 to 22, which is applied by snapping onto the frame (8a, 8b).

27. The trigger head according to claim 26, wherein: The housing (100) extends up to the base frame (18) of the frames (8a, 8b).

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