Fluid-tight slide fastener
A fluid tight slide fastener ( 10 ) including a slider ( 15 ) slidably associated with opposite edges ( 12 a ) of two flanking strips ( 12 ) to provide for their closure, and an upper end stop ( 16 ) with which the slider ( 15 ) is removably engaged upon closure. A clearance-recovery wedge-like coupling is included at the upper stop ( 16 ) and in the slider ( 15 ), which includes respective tilted sections ( 19,21 ) and opposite tilted sections ( 46,47 ) to make, upon engagement of the upper stop ( 16 ) and slider ( 15 ), a clearance-recovery taper fit.
1. A fluid tight slide fastener comprising:
two flanking strips, each of said flanking strips having a row of closure elements;
a slider slidably associated with opposite edges of said two flanking strips to provide for their closure; and
an upper end stop with which said slider is removably engaged upon closure,
wherein said upper end stop has at least one section with a first tilted surface having a slope with reference to a horizontal symmetry plane with respect to the upper end stop;
wherein said slider has at least one section with a second tilted surface having a slope with reference to said horizontal symmetry plane; and
wherein said first tilted surface of the upper end stop matches said second tilted surface of the slider, such that said first and second tilted surfaces are complementary to each other, providing a clearance-recovery wedge coupling between the slider and the upper end stop upon closure of the slide fastener and engagement of said slider with said upper end stop.
2. The slide fastener according to claim 1 , wherein said tilted surfaces are formed integrally in said upper end stop and in said slider, respectively.
3. The slide fastener according to claim 1 , wherein said upper end stop is composed of a block of plastic material sealed on the outer perimeter to said strips, said block comprising a head portion connected to a pair of opposite left and right arms, said arms and said head portion forming a seat for a diamond of said slider.
4. The slide fastener according to claim 3 , wherein said head portion of the upper end stop has said tilted surfaces on opposite top and bottom sides, and each of said left and right arms of the upper end stop has tilted surface sections on opposite top and bottom sides.
5. The slide fastener according to claim 4 , wherein the slope of the tilted surfaces of the head portion of the upper end stop is greater than a slope of the tilted surfaces of the arms of the upper end stop.
6. The slide fastener according to claim 5 , wherein the slope of the tilted surfaces of the head portion is in the range of 5°-25°, while the slope of the tilted surfaces of the arms is not greater than 8° with reference to said horizontal plane of symmetry.
7. The slide fastener according to claim 5 , wherein each tilted surface of said arms has a variable slope.
8. The slide fastener according to claim 7 , wherein said slider comprises an upper element and a lower element connected by a middle diamond core and internally forming a seat for said upper end stop.
9. The slide fastener according to claim 8 , wherein said slider comprises a front tilted surface followed by a left tilted surface and a right tilted surface, the left and right tilted surfaces being formed in each of said upper and lower elements.
10. The slide fastener according to claim 9 , wherein for each of the upper and lower elements, the slope of said front tilted surface is greater than the slope of said left and right tilted surfaces.
11. The slide fastener according to claim 9 , wherein each front tilted surface of an upper or lower element of the slider is mated with one of the opposite tilted surfaces of the head portion of the upper end stop while the left and right tilted surfaces of an upper or lower element is mated to a respective tilted section of one of the arms of the upper end stop.
12. The slide fastener according to claim 9 , wherein said diamond is in a rear position with respect to the front end of said slider.
13. The slide fastener according to claim 9 , wherein the arms of the upper end stop have respective appendages towards the exterior, said appendages being guided by lateral walls of said seat of the slider during the engagement of the upper end stop with the slider, and substantially come into abutment against each other upon completed engagement.
14. The slide fastener according to claim 6 , wherein the slope of the titled surfaces of the head portion is in the range of 10°-15°, while the slope of the tilted surfaces of the arms is between 2°-6° with reference to said horizontal plane of symmetry.
15. The slide fastener according to claim 7 , wherein each tilted surface of said arms has a variable slope with the angle increasing towards the front end of the upper end stop.