Pumps for discharging fluid products

Abstract

The present invention relates to a pump for discharging a fluid product, comprising: a pump body (14) having a pump chamber (14a); a piston (16) that slides between a resting position and an operating position within the pump body (14); an elastic return member (50) that returns the pump to the resting position after each operation; and a deformable element (60) that generates pre-compression at the start of each operation, wherein the deformable element (60) includes a hollow cylindrical tube (61) made of a deformable material such as an elastomer, particularly a thermoplastic elastomer, wherein the tube (61) is positioned radially inward of the piston (16), is slightly deformed radially inward by radially protruding profiles (65, 65') in the resting position of the piston (16), and is bent radially inward when a threshold operating force is applied to the piston (16) by the user during operation.

Claims

[Claim 1] A pump for discharging fluid products, A pump body (14) having a pump chamber (14a), A piston (16) slides between a resting position and an operating position within the pump body (14), An elastic return member (50) that returns the pump to the resting position after each operation, A deformable element (60) that causes pre-compression at the start of each operation, Equipped with, The deformable element (60) includes a hollow cylindrical tube (61) made of a deformable material such as an elastomer, particularly a thermoplastic elastomer. The tube (61) is positioned radially inward of the piston (16) and, in the resting position of the piston (16), is slightly deformed radially inward by the radially protruding profile (65, 65'), and during operation, when a threshold operating force is applied to the piston (16) by the user, it is bent radially inward. A pump characterized by the following features. [Claim 2] One of the tube (61) and the piston (16) is provided with the radially protruding profile (65, 65'), The radially protruding profiles (65, 65') come into contact with the other of the tube (61) and the piston (16) when the piston (16) is in a resting position, causing the slight radially inward deformation of the tube (61). The pump according to feature 1. [Claim 3] The radially protruding profile (65) is a radially outward protruding profile formed on the tube (61), protruding radially outward from the tube (61), and cooperating with the piston (16) in the resting position. The pump according to feature 2. [Claim 4] The radially protruding profile (65') is a radially inward protruding profile formed on the piston (16), protruding radially inward from the piston (16) and cooperating with the tube (61) in the resting position. The pump according to feature 2. [Claim 5] The radially protruding profiles (65, 65') are peripheral ribs. The pump according to any one of features 1 to 4. [Claim 6] The radially protruding profiles (65, 65') include a plurality of lugs arranged at the same axial height around the tube (61) or the piston (16). The pump according to any one of features 1 to 4. [Claim 7] The radial projection profiles (65, 65') are positioned approximately in the axial center of the tube (61) or the piston (16). The pump according to any one of claims 1 to 6. [Claim 8] The pump body (14) comprises an upper opening that is closed by the piston (16) and a lower opening (29) that is closed by an inlet valve (20) held in a predetermined position by a valve holder (21) fixed inside the pump body (14). The piston (16) slides in a sealed state within the pump body (14) around a hollow axial rod (15) connected to the discharge head (1). The hollow axial rod (15) has an axial inner channel (15a) that is closed on the axial lower side and communicates with the outside by a radial orifice (17b). The piston (16) has an outer seal lip (16a) on its radially outer edge, configured to seal against the pump body (14), and an inner seal lip (16c) on its radially inner edge, configured to close the radial orifice (17b) when not in operation. The pump according to any one of claims 1 to 7. [Claim 9] The tube (61) is supported on its upper axial side by the shoulder (23) of the hollow axial rod (15) and on its lower axial side by the piston (16). The pump according to feature 8. [Claim 10] A hollow axial insert (17) is fixed to the hollow axial rod (15), and the radial orifice (17b) is provided in the hollow axial insert (17). The pump according to feature 8 or 9. [Claim 11] The elastic return member (50) is made of nonmetal. The pump according to any one of claims 1 to 10. [Claim 12] The elastic return member (50) is a bellows positioned between the discharge head (1) and a portion fixed to the pump body (14), such as the fixing ring (10). The pump according to feature 11. [Claim 13] A fixing ring (10) is provided for fixing the pump body (14) to the container via a neck seal (11). A ring seal (13) is provided to ensure a secure seal between the fixing ring (10) and the pump body (14). The pump according to any one of claims 1 to 12. [Claim 14] In the aforementioned resting position, the axial upper end (16b) of the piston (16) cooperates with the ring seal (13) in a sealed state. The pump according to feature 13. [Claim 15] A fluid product dispensing device comprising a discharge head (1) provided with a discharge port (2), The discharge head (1) is attached to the pump according to any one of claims 1 to 14. A fluid product dispensing device characterized by the following features.

Images