Triggered dispensing device with mechanism to avoid product loss

Abstract

A trigger dispensing head (4) applicable to a bottle (2) of a trigger dispensing device (1) includes a cylindrical chamber (14), a primary vent passage (26), a sleeve (30), a secondary vent passage (50), a piston (80), a pumping conduit, and a dispensing conduit. The sleeve (30) is rotatable by a user between an angular working position in which the primary vent passage (26) is in fluid communication with the secondary vent passage (50) and an angular rest position in which the primary vent passage (26) is fluidly separated from the secondary vent passage (50).

Description

[0001] Existing technology

[0002] This invention belongs to the field of trigger-type dispensing devices, which are typically used to dispense liquid products for household hygiene, personal care, and a number of other purposes. Specifically, the subject of this invention is a trigger-type dispensing head applicable to bottles, wherein the trigger-type dispensing head is provided with a leak-proof device to prevent product leakage from the venting channel. Background Technology

[0003] Trigger-activated dispensing devices are very popular today, with hundreds of millions manufactured and sold every year.

[0004] Traditionally, once the bottles are filled with product and the dispensing heads have been applied, these devices are placed in specially sized cardboard boxes to ensure their safe transport to storage or sales locations. Specifically, these boxes ensure that the devices are not subjected to impacts that could impair their functionality or cause product spillage, whether loading or unloading from transport or storage facilities. Furthermore, placing individual devices on supermarket shelves is a meticulous and typically very careful task performed by attentive staff.

[0005] In recent years, consumers have widely utilized online commerce to purchase food, detergents, and other goods. This widespread use of sales methods has also created new demands and raised new challenges for the trigger-activated dispensing device industry.

[0006] In fact, it is quite common to store the device under less than ideal conditions, or to ship the device to consumers in a standard-sized box that is larger than the device itself, or to place different items (such as books or other bottles) in the same box.

[0007] During transportation, the device is subjected to impacts and compression, which may result in breakage of components such as triggers or housings, device disintegration, unintended activation of triggers, and often product leakage.

[0008] One drawback is that the product leaks through a venting duct, which typically connects the bottle's internal compartments to the external environment. This is necessary to allow air to enter the bottle during the suction step while simultaneously drawing the product from the bottle toward the pressure chamber. Summary of the Invention

[0009] The purpose of this invention is to manufacture a trigger-based allocation header that meets the above requirements and overcomes the aforementioned drawbacks.

[0010] This objective is achieved by the allocation header as described in the present invention. This trigger-type dispensing head is applicable to bottles of trigger-type dispensing devices. The trigger-type dispensing head includes: a cylindrical chamber annularly defined by a cylindrical wall having an inner surface; a primary venting channel passing through the cylindrical wall and adapted to communicate an inner compartment of the bottle with the inner surface of the cylindrical wall; a sleeve, at least partially received within the cylindrical chamber, the sleeve including: an annular sleeve wall having an outer surface and an inner surface communicating with an external environment; and a secondary venting channel passing through the sleeve wall; an axially sliding piston sealed within the sleeve between an initial rest position and a final stroke end position, the piston including an annular piston seal forming a pressure chamber; a suction conduit and a dispensing conduit, the suction conduit adapted to communicate an inner compartment of the bottle with the pressure chamber, and the dispensing conduit adapted to communicate the pressure chamber with the external environment; wherein the sleeve is rotatable by a user between an angular working position and an angular rest position, in which the primary venting channel and the secondary venting channel are in fluid communication, and in the angular rest position, the primary venting channel and the secondary venting channel are in fluid separation.

[0011] The present invention also includes other advantageous embodiments as described below.

[0012] Preferably, the dispensing head includes a sealing ridge disposed between the inner surface of the columnar wall and the outer surface of the sleeve wall; wherein, in the angular static position, the main ventilation channel is fluidly separated from the secondary ventilation channel by the sealing ridge.

[0013] Preferably, the sleeve has at least one recess inside, the recess extending at a predetermined angle and axially accessible from the outside, and the piston includes at least one abutment; such that in the angular rest position of the sleeve, the abutment prevents the piston from axially translating toward the end-of-stroke position, and in the angular working position, the abutment can be inserted into the recess to allow the piston to translate toward the end-of-stroke position.

[0014] Preferably, the sleeve wall includes a sleeve edge that circumferentially defines a head opening for inserting a piston, and wherein a recess forms an extension on the sleeve edge that is adapted to insert an abutment portion of the piston.

[0015] Preferably, the sleeve includes an operating portion that protrudes radially from the outside of the sleeve wall, the operating portion being able to be gripped by a user to rotate the sleeve.

[0016] Preferably, the dispensing head includes: a suction valve device adapted to allow product to enter the pressure chamber from the suction pipe during the suction step and to prevent product from entering the suction pipe from the pressure chamber during the dispensing step; and a pre-compression valve device adapted to allow product to enter the dispensing pipe from the pressure chamber only when the pressure of the product in the pressure chamber exceeds a predetermined threshold.

[0017] Preferably, the dispensing head includes a valve element comprising a flexible annular diaphragm that engages with a sleeve to achieve pre-compression of the valve device.

[0018] The sleeve includes an annular end wall, which cooperates with the diaphragm to realize the pre-compression valve device.

[0019] The valve element includes a flexible flap that mates with a suction nozzle that defines the suction channel to realize a suction valve device.

[0020] According to another aspect of the present invention, a trigger-type dispensing device is provided, comprising: a trigger-type dispensing head according to a first aspect of the present invention; a bottle for containing a product to be dispensed; wherein the dispensing head is applied to the bottle.

[0021] According to another aspect of the present invention, a trigger-type dispensing head is provided, applicable to bottles of a trigger-type dispensing device. The trigger-type dispensing head includes: a cylindrical chamber; a sleeve at least partially received in the cylindrical chamber and having at least one recess inside, the recess extending at a predetermined angle and axially accessible from the outside; an axially slidable piston sealed inside the sleeve between an initial rest position and a final stroke end position, the piston including: an annular piston seal forming a pressure chamber; and at least one abutment; a suction conduit and a dispensing conduit, the suction conduit being adapted to communicate an inner compartment of the bottle with the pressure chamber, and the dispensing conduit being adapted to communicate the pressure chamber with the external environment; wherein the sleeve is rotatable by a user between an angle-locked position and an angle-unlocked position, in the angle-locked position, the abutment preventing axial translation of the piston toward the stroke end position, and in the angle-unlocked position, the abutment being insertable into the recess to allow translation of the piston toward the stroke end position.

[0022] Preferably, the piston is a single piece. Attached Figure Description

[0023] The features and advantages of the distribution head according to the invention will become apparent from the following description, which is given by way of non-limiting example with reference to the figures in the accompanying drawings, in which: - Figure 1 A trigger-type dispensing device according to an embodiment of the present invention is described; - Figure 2 A cross-sectional view of a trigger-type distribution head according to an embodiment of the present invention is shown; - Figure 3 The initial locking configuration for the allocation header is shown; - Figure 4 yes Figure 3 Cross-sectional view; - Figure 5 The initial release configuration of the allocation header is shown; - Figure 6 yes Figure 5 Cross-sectional view; - Figure 7 The dispensing head is depicted with the pre-compression valve device in an open configuration; - Figure 8 The distribution head is depicted with the piston in the end-of-stroke position. - Figure 9 The dispensing head is depicted with the suction valve device in an open configuration. - Figure 10 The framework for assigning the head is depicted; - Figure 11 yes Figure 10 A cross-sectional view of the frame in the diagram; - Figure 12 The sleeve for dispensing the head is shown; - Figure 13 yes Figure 12 A cross-sectional view of the sleeve in the middle; - Figure 14 The piston of the dispensing head is shown; - Figure 15 yes Figure 14 A cross-sectional view of the piston in the image; - Figure 16 The trigger for assigning the header is described; - Figure 17 yes Figure 16 A cross-sectional view of the trigger in the circuit; - Figure 18 depicts the valve element of the dispensing head; - Figure 19 is a cross-sectional view of the valve element in Figure 18; Figure 20 is a plan view of the valve element in Figure 18. Detailed Implementation

[0024] Referring to the figures in the accompanying drawings, the trigger-type dispensing device, including the bottle 2 for containing the liquid product to be dispensed and the trigger-type dispensing head 4 applied to the neck 2a of the bottle, is collectively referred to as 1. The neck 2a has a neck axis X.

[0025] The head 4 can be applied to the bottle 2 via a sleeve system comprising a threaded sleeve that can be screwed onto the neck 2a, or, according to a variant, the head can be connected to the bottle via a locking system (not shown), which preferably has an anti-removal ridge.

[0026] The head 4 includes a frame 10 adapted to support the components of the head 4, which is preferably made of a single piece of plastic material, for example by injection molding.

[0027] The frame 10 includes an attachment portion 12 having a main opening 12a with an attachment axis Z; when the head 4 is applied to the neck 2a, the main opening 12a communicates with a compartment inside the neck 2a, and the attachment axis Z coincides with the neck axis X.

[0028] The head 4 also includes a cylindrical chamber 14 having a chamber axis K orthogonal to the attachment axis Z; preferably, the cylindrical chamber 14 is formed in the frame 10.

[0029] The head 4 also includes a suction tube that connects the main opening 12a to the columnar chamber 14.

[0030] Preferably, the suction conduit includes: a first suction section 16, starting from the main opening 12a and extending along a first suction axis W parallel to and preferably spaced apart from the attachment axis Z; and a second suction section 18, fluidly communicating within the cylindrical chamber 14 and extending along a second suction axis Y parallel to the chamber axis K; for example, the second suction axis Y coincides with the chamber axis K. The second suction section 18 is defined by a suction nozzle portion 18a.

[0031] Furthermore, preferably, the first suction section 16 and / or the second suction section 18 are formed in the frame 10.

[0032] The head 4 also includes a distribution conduit that connects the columnar chamber 14 to the external environment.

[0033] Preferably, the dispensing conduit includes: a first dispensing section 20, starting from the columnar chamber 14 and extending along a first suction axis J orthogonal to the chamber axis K; and a second dispensing section 22, opening to the external environment and extending along a second dispensing axis Q parallel to the chamber axis K.

[0034] Furthermore, preferably, the first allocation segment 20 and / or the second allocation segment 22 are formed in the frame 10.

[0035] The head 4 also includes a nozzle 29 applied to the free end of the second dispensing section 22. The nozzle is preferably rotatable between a dispensing position and a closed position, in which the second dispensing section 22 is in communication with the external environment and in which fluid communication between the second dispensing section 22 and the external environment is blocked.

[0036] The cylindrical chamber 14 is annularly defined by a cylindrical wall 24 having an inner surface 24b and a bottom wall 25, from which the suction nozzle 18a of the suction conduit (and specifically the second suction section 18) protrudes. Furthermore, a valve compartment 25' is defined between the sleeve 30, the cylindrical wall 24, and the bottom wall 25, which will be discussed below.

[0037] On the other hand, a main ventilation passage 26 is formed in the columnar wall 24 to connect the main opening 12a with the columnar chamber 14. In addition, at least one through slot 28 with a circumferential pattern is present in the columnar wall 24, which is preferably a pair of slots.

[0038] The head 4 also includes a sleeve 30 inserted into the cylindrical chamber 14, which is axially rotatable relative to the chamber axis K, and preferably the sleeve is constrained in terms of axial translation.

[0039] For example, sleeve 30 includes a cylindrical sleeve wall 32 that defines a head opening 33 of sleeve 30 defined by sleeve edge 33a; sleeve wall 32 also has an outer surface 32a and an inner surface 32b. Sleeve 30 also includes: a bottom wall 34 orthogonal to the chamber axis K; and an annular end wall 36 that defines a bottom opening 38 of sleeve 30.

[0040] Preferably, the annular end wall 36 decreases in the radial direction relative to the sleeve wall 32. Preferably, the diameter of the end wall 36 is smaller than the diameter of the sleeve wall 32.

[0041] Preferably, the valve compartment 25' has an annular shape that extends radially outward around the end wall 36.

[0042] On the outer surface 32a, the sleeve 30 has: a first sealing region 40 defined by a first sealing ridge (e.g., a first circumferential sealing ridge 42a and a first axial sealing ridge 42b); and a second closed sealing region 44 defined by a second sealing ridge (e.g., a second circumferential sealing ridge 42c).

[0043] Preferably, the first circumferential sealing ridge 42a and the second circumferential sealing ridge 42c form two continuous, axially spaced circumferential sealing convex edges, while the first axial sealing ridge 42 forms two continuous, circumferentially spaced axial sealing convex edges disposed between the circumferential sealing convex edges.

[0044] According to a variant embodiment (not shown), the axial sealing ridge is disposed on the outer surface of the sleeve, while the circumferential sealing ridge is disposed on the inner surface of the columnar wall.

[0045] The sleeve 30 also has a secondary venting passage 50 that passes through the sleeve wall 32 and leads to the outer surface 32a within the first sealing region 40.

[0046] The sleeve 30 also includes at least one pin 51 (preferably a pair of pins) that extends from the outer surface 32a and is adapted to be received in a corresponding slot 28 of the columnar chamber 14.

[0047] Internally, the sleeve 30 has at least one recess 60 (preferably a pair of recesses) with a predetermined angular extension, and the recess opens at the head opening 33 of the sleeve 30 for axial access. For this purpose, the recess 60 forms an enlargement 62 on the sleeve edge 33a of the head opening 33.

[0048] The sleeve 30 also includes an actuating portion 70, which includes, for example, an element extending radially outward from the sleeve wall 32 near the head opening 33.

[0049] The suction conduit is in fluid communication with the sleeve 30 through the bottom opening 38; specifically, the second suction section 18 leads to the sleeve 30, for example, to the annular compartment defined by the end wall 36.

[0050] The head 4 also includes a piston 80, which is inserted into the sleeve 30 through the head opening 33 and can be slidably sealed within the sleeve 30.

[0051] Preferably, the piston 88 is made of a single piece of plastic material, for example, by injection molding.

[0052] The preferred hollow piston 80 includes an annular piston wall 82 extending along the piston axis P between a front end 84 and a rear end 86. The piston 80 also includes a piston bottom 86 located at the front end 84 and at least one circumferential piston seal 88 projecting outward from the piston wall 82. At the rear end 86, the piston 80 has a piston coupling portion 90 for coupling to a trigger of the head 4, for example, the piston coupling portion being provided with a hole 92.

[0053] The piston 80 also includes at least one abutment portion 94 (preferably a pair of abutment portions) that extends radially outward from the piston wall 82 and is preferably located near the rear end 86.

[0054] When assembling the head 4, the sleeve 30 is inserted into the cylindrical chamber 14 such that the sleeve edge 33a remains outside the cylindrical chamber 14 and abuts against the edge of the cylindrical wall 24; the operating part 70 also remains outside.

[0055] The pin 51 of the sleeve 30 is slidably received in the slot 28.

[0056] The sealing ridges 42a, 42b, and 42c located on the outer surface 32a of the sleeve 30 together form a seal with the inner surface 24b of the columnar wall 24.

[0057] The piston 80 is then inserted into the sleeve 30; within the sleeve 30, the piston seal 88 defines a pressure chamber 30a on the open side of the suction pipe.

[0058] The head 4 also includes a trigger 100, which includes: a lever actuation portion 102 adapted to position a user's finger for actuating the head 4; and a trigger engagement portion 104 for connection with the piston 80. For example, the trigger 100 is hinged to the piston 80, such as through engagement of the trigger engagement portion 104 with the piston engagement portion 90 of the piston 80.

[0059] The head 4 also includes a resilient return device adapted to act directly or indirectly on the piston 80 permanently to bring the piston to its initial position (which will be discussed below). For example, the return device includes at least one flexible element 110 (preferably a pair of flexible elements) that is made as a single piece with the actuation portion 102 of the trigger 100.

[0060] The head 4 also includes a valve device adapted to regulate the flow of product from the suction pipe to the pressure chamber 30a and from the pressure chamber 30a to the distribution pipe. The valve device is housed in the valve compartment 25'.

[0061] The valve device includes at least a partially flexible valve element 200, which is manufactured as a single piece, for example, by injection molding.

[0062] Valve element 200 includes a tubular portion 202, which includes an annular valve wall 204 extending along the valve axis V between a front end 210 and a rear end 206 defining a rear opening 208.

[0063] The valve element 200 also includes a flexible flap 212 that is cantilevered to the front end 210 of the valve wall 204 and extends radially inward.

[0064] The lobes 212 have a baffle portion 214 on the side facing the rear opening 208, which is, for example, flat, hemispherical, or truncated cone in shape.

[0065] The valve element 200 also includes an annular diaphragm 216 extending radially outward from the tubular portion 202. The diaphragm 216 is, for example, flat, or according to another variation (not shown), the diaphragm is recessed on the portion facing the front end 210 of the tubular portion 202, or protrudes on the portion facing the front end 210 of the tubular portion 202.

[0066] The valve element 200 also includes a support portion 218, which includes an annular support wall 220 connected to and surrounding the diaphragm 216.

[0067] Preferably, the support wall 220 has a flared shape toward the front end 210 of the tubular portion 202, and the support wall has a wavy valve base 222 on the portion facing the rear end 206, the valve base forming a support portion for the valve element.

[0068] The valve element 200 is located in the columnar chamber 14 and abuts against the bottom wall 25, and the valve base 222 is placed against the bottom wall; on the other hand, the support wall 220 contacts the columnar wall 24 and forms a seal to prevent product leakage.

[0069] The tubular portion 212 is threaded onto the suction conduit, and specifically threaded onto the second suction section 18, and the flap 212 forms a flexible baffle for the suction conduit. The suction nozzle portion 18a of the suction conduit and the flexible flap 212 form a suitable suction valve device for allowing product from the suction conduit into the pressure chamber 30a during the suction step, and for preventing product from entering the suction conduit from the pressure chamber 30a during the dispensing step.

[0070] The diaphragm 216 mates with the sleeve 30, and specifically, the diaphragm closes the bottom opening 38 of the pressure chamber 30a and abuts against the end wall 36. The end wall 36 and the diaphragm 216 form a pre-compression valve device adapted to allow product from the pressure chamber 30a into the distribution channel only when the pressure in the pressure chamber 30a exceeds a predetermined threshold. The pre-compression valve is also adapted to prevent product from entering the pressure chamber 30a from the distribution channel during the suction step.

[0071] Therefore, the valve element 200, which mates with the suction nozzle portion 18a of the suction pipe and the end wall 36 of the sleeve, integrates the suction valve device and the pre-compression valve device into a single component.

[0072] In normal operation of the trigger-type dispensing device, the head 4 is applied to the bottle 2, so that the suction tube is connected to the compartment inside the bottle via the main opening 12a.

[0073] Preferably, in the initial locking configuration ( Figure 3 In the initial locking configuration, the sleeve 30 is in the angular locking position, whereby the sleeve edge 33a impedes the axial translation of the piston 80's abutment portion 94. Therefore, when the trigger 100 is actuated, the piston 80 is prevented from completing the actuation distribution stroke. In the initial locking configuration, the operating portion 70 and the pin 51 of the sleeve 30 are in their respective angular locking positions.

[0074] In this configuration, the main ventilation passage 26 is sealed to isolate it from the external environment, thereby preventing product leakage in the event of the device tipping over. In fact, when the sleeve is in the angle-locked position, the main ventilation passage 26 leads to a second sealing area 44 on the outer surface 32a of the sleeve 30, which engages with the inner surface 24b of the columnar wall 24 to form a sealed, enclosed space. Figure 4 ).

[0075] Preferably, the head 4 reaches the initial release configuration by rotating the sleeve 30 by, for example, about 45° via the actuating part 70. Figure 5 In this initial release configuration, the recess 60 of the sleeve 30 is axially aligned with the abutment portion 94 of the piston 80, such that when the trigger 100 is actuated, the piston 80 can perform an actuation stroke that allows the product to be dispensed. In the initial release configuration, the operating portion 70 and the pin 51 of the sleeve 30 are in the corresponding angular release positions.

[0076] Furthermore, in this configuration, the main venting passage 26 opens to the external environment, thereby allowing air to be drawn from the outside into the internal compartment of the bottle during the suction step. In fact, when the sleeve 30 is in the angled release position, the main venting passage 26 is in fluid communication with a first sealing region 40 on the outer surface 32a of the sleeve 30. This first sealing region cooperates with the inner surface 24b of the columnar wall 24 to form a defining space, which communicates with the inner surface 32b of the sleeve 30 via a secondary venting passage 50. This inner surface is in fluid communication during the suction step (…). Figure 6 During this period, it is connected to the external environment.

[0077] In other words, the sleeve 30 can be rotated by the user between an angular working position and an angular rest position. In the angular working position, the main venting passage 26 and the secondary venting passage 50 are in fluid communication, and in the angular rest position, the main venting passage 26 and the secondary venting passage 50 are fluidly separated. Specifically, in the angular rest position, the main venting passage 26 is fluidly separated from the secondary venting passage 50 by the sealing ridges 42a, 42b, and 42c located between the inner surface 24b of the columnar wall 24 and the outer surface 32a of the sleeve wall 32.

[0078] In the initial release configuration, trigger 100 and piston 80 are in their respective initial rest positions, and the pre-compression valve device and suction valve device are in their respective closed configurations.

[0079] Actuation trigger 100 causes piston 80 to move axially, which moves within sleeve 30 and applies pressure to the product contained in pressure chamber 30a.

[0080] Once the predetermined threshold pressure in pressure chamber 30a is exceeded, the pre-compression valve device switches to an open configuration, in which the pre-compression valve device allows the product to enter the distribution pipe from pressure chamber 30a. Figure 7 ).

[0081] Specifically, the diaphragm 216 separates from the end wall 36 of the sleeve 30 and allows the product to enter the dispensing channel, thereby allowing the product to be dispensed outward through the nozzle 29 (dispensing step). The suction valve device remains in a closed configuration.

[0082] Once trigger 100 and piston 80 are in the end-of-stroke position ( Figure 8 Once the allocation steps are completed, the trigger 100 is released and the elastic return mechanism operates to return the piston 80 and the trigger 100 to their initial rest positions.

[0083] The piston 80 returning to its initial rest position causes a pressure drop in the pressure chamber 30a, which causes the suction valve device to move into an open configuration, in which the suction valve device allows product to be drawn from the suction line into the pressure chamber 30a. Figure 9 ).

[0084] Specifically, the flap 216 bends and separates from the suction nozzle 18a of the suction pipe, thereby allowing the product to enter the pressure chamber 30a from the suction pipe (suction step).

[0085] Furthermore, during the suction step, the internal compartment of the bottle is connected to the external environment through the secondary ventilation passage 50, the first sealing area 40, and the main ventilation passage 26.

[0086] Furthermore, according to a preferred embodiment, the head 4 includes a housing 300 attached to the frame 10 to cover the frame. Preferably, the housing 300 is applied to the frame 10 by at least one snap-fit ​​connector.

[0087] For example, a first snap-fit ​​connector 302 is provided in the upper region of the frame 10, such as above the second distribution section 22; and a second snap-fit ​​connector 304 is provided in the lower region of the frame, such as below the bottom wall 25 of the columnar chamber 14.

[0088] For example, at least one snap-fit ​​connector includes a pair of flexible hooks 302', 302' that operate in opposite directions.

[0089] Furthermore, preferably, the upper surface 306 of the housing 300 includes a flat region 308. Advantageously, this region allows for better support of any weight on the device (e.g., during storage in a warehouse), thereby preventing the housing from detaching from the frame.

[0090] Furthermore, according to one embodiment, the first distribution segment 20 is formed in the frame 10 and extends along a first suction axis J orthogonal to the chamber axis K, and the frame 10 also has an extension 10' of the first distribution segment 20 along the first suction axis J.

[0091] The extension 10' itself opens to the outside to allow the introduction of a core for forming the first distribution segment 20 during the molding of the frame.

[0092] Preferably, the outer casing 300 includes an inwardly projecting cap 310 adapted to close the inlet / outlet of the extension 10' to the outside.

[0093] Furthermore, preferably, the cap 310 is connected to the remainder of the housing 300 via a plurality of breakable spacers 312. In the event of a strong impact (such as even causing temporary deformation or disintegration of the housing 300), at least some of the spacers 312 will break, causing the cap 310 to be at least partially released from the remainder of the housing 300 and retaining the closed extension 10'. Advantageously, this prevents product leakage from the extension 10'.

[0094] According to a variant embodiment (not shown), the outer casing has no cap, but the head includes a separate cap applied to the extension to close the extension.

[0095] According to another aspect of the invention, the distribution head includes: - Columnar chamber 14; - Sleeve 30, at least partially received in columnar chamber 14 and having at least one recess 60 inside, the at least one recess extending at a predetermined angle and axially accessible from the outside; - An axially slidable piston 80 is sealed inside a sleeve 30 between an initial rest position and a final stroke end position, and the piston includes: an annular piston seal 88 forming a pressure chamber 30a; and at least one abutment portion 94; - A suction pipe and a dispensing pipe, wherein the suction pipe is adapted to connect the internal compartment of the bottle with the pressure chamber 30, and the dispensing pipe is adapted to connect the pressure chamber 30a with the external environment; - The sleeve 30 can be rotated by the user between an angle-locked position and an angle-unlocked position. In the angle-locked position, the abutment 94 prevents the piston from axially translating toward the end-of-stroke position. In the angle-unlocked position, the abutment 94 can be inserted into the recess 60 to allow the piston 80 to translate to the end-of-stroke position.

[0096] According to another aspect of the invention, the dispensing head includes: - A columnar chamber 14, which is circumferentially defined by columnar walls 24 and at its bottom by a base wall 25; - Sleeve 30 can be at least partially inserted into cylindrical chamber 14; - An axially sliding piston 80 is sealed inside a sleeve 30 between an initial rest position and a final stroke end position, and the piston includes an annular piston seal 88 forming a pressure chamber 30a. - A suction pipe and a dispensing pipe, wherein the suction pipe is adapted to connect the inner compartment of the bottle to the pressure chamber 30a, and the dispensing pipe is adapted to connect the pressure chamber 30a to the external environment. - A valve device suitable for regulating the flow of product from the suction pipe to the pressure chamber 30a and from the pressure chamber 30a to the distribution pipe.

[0097] Innovatively, the dispensing head described above meets industry needs and overcomes the shortcomings discussed above because, when in its initial locked configuration, the dispensing head prevents product from escaping through the venting channel. Simultaneously, the dispensing head also prevents the trigger from actuating the piston.

[0098] Furthermore, advantageously, the piston slides inside a sleeve that has not shrunk significantly after molding; thus, the sliding occurs on a surface with high cylindricity, which ensures a better seal.

[0099] It should be understood that, in order to meet possible needs, those skilled in the art may modify the allocation header described above, and all such modifications are included within the scope of protection defined by the appended claims.

Claims

1. A trigger-type dispensing head (4) applicable to a bottle (2) of a trigger-type dispensing device (1), the trigger-type dispensing head comprising: - A columnar chamber (14) is annularly defined by a columnar wall (24) having an inner surface (24b); - A main ventilation channel (26) passes through the columnar wall (24) and is adapted to communicate the inner compartment of the bottle with the inner surface (24b) of the columnar wall (24); - A sleeve (30), at least partially received in the cylindrical chamber (14), the sleeve comprising: an annular sleeve wall (32) having an outer surface (32a) and an inner surface (32b) communicating with the external environment; and a secondary ventilation channel (50) passing through the sleeve wall (32). - An axially sliding piston (80) is sealed inside the sleeve (30) between an initial rest position and a final stroke end position, and the piston includes an annular piston seal (88) forming a pressure chamber (30a). - A suction pipe and a dispensing pipe, the suction pipe being adapted to communicate the inner compartment of the bottle with the pressure chamber (30a), and the dispensing pipe being adapted to communicate the pressure chamber (30a) with the external environment; - Wherein, the sleeve (30) can be rotated by the user between an angular working position and an angular stationary position, in which the main ventilation channel (26) and the secondary ventilation channel (50) are in fluid communication, and in the angular stationary position, the main ventilation channel (26) and the secondary ventilation channel (50) are in fluid separation.

2. The allocation header according to claim 1, comprising: - Sealing ridges (42a, 42b, 42c) are provided between the inner surface (24b) of the columnar wall (24) and the outer surface (32a) of the sleeve wall (32); - in, In the angular static position, the primary ventilation channel (26) is fluidly separated from the secondary ventilation channel (50) by the sealing ridges (42a, 42b, 42c).

3. The distribution head according to claim 1 or 2, wherein, - The sleeve (30) has at least one recess (60) inside, the recess extends at a predetermined angle and can be axially entered from the outside, and the piston (80) includes at least one abutment (94). - So that in the angular rest position of the sleeve (30), the abutment (94) prevents the piston from axially translating toward the stroke end position, and in the angular working position, the abutment (94) can be inserted into the recess (60) to allow the piston (80) to translate toward the stroke end position.

4. The allocation head according to claim 3, wherein, - The sleeve wall (32) includes a sleeve edge (33a) that circumferentially defines a head opening (33) for inserting the piston (80), and wherein, - The recess (60) forms an extension (62) on the sleeve edge (33a), the extension being adapted to be inserted into the abutment (94) of the piston (80).

5. The distribution head according to claim 1 or 2, wherein, The sleeve (30) includes an operating portion (70) that protrudes radially from the outside of the sleeve wall (32), the operating portion (70) being able to be gripped by a user to rotate the sleeve.

6. The allocation header according to claim 1 or 2, comprising: - A suction valve device, adapted to allow product to enter the pressure chamber (30a) from the suction channel during a suction step, and to prevent product from entering the suction channel from the pressure chamber (30a) during a dispensing step; and - A pre-compression valve device adapted to allow the product to enter the distribution pipe only when the pressure of the product in the pressure chamber (30a) exceeds a predetermined threshold.

7. The dispensing head according to claim 6, comprising a valve element (200) including a flexible annular diaphragm (216) that cooperates with the sleeve (30) to realize the pre-compression valve device.

8. The allocation head according to claim 7, wherein, The sleeve (30) includes an annular end wall (36) that cooperates with the diaphragm (216) to realize the pre-compression valve device.

9. The allocation head according to claim 8, wherein, The valve element (200) includes a flexible flap (212) that engages with a suction nozzle portion (18a) that defines the suction conduit to realize the suction valve device.

10. A trigger-type dispensing device (1), comprising: - Triggered allocation header (4) according to any one of the preceding claims; - Bottle (2), used to hold the product to be dispensed; - Wherein, the dispensing head (4) is applied to the bottle (2).

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