Gas tap with flame safety device

Abstract: A gas tap with a safety device for hob units, comprising a housing (2) for the tap, a rotary rod (3) that moves axially to control gas flow, a cover (10) in the base of the tap, forming a sealed chamber (9), a safety valve whose obturator (5) moves at right angles to the rod (3) and a mechanism (11,12) for kinetic transmission from said rod (3) for the operation by means of a rocker of said safety obturator (5), said kinetic transmission mechanism (11,12) has a thrust element (11) which can be moved axially by the rod (3) of the tap, and is free to rotate with the rocker (12), coupled inside the tap by the reciprocal contact of a number of inclined surfaces (19,20) on both.

Description: THE TECHNOLOGICAL FIELD This invention relates to a gas tap for hob units and more specifically those with a kinetic transmission mechanism to manually operate the flame safety valve obturator, combined with the control valve. PRIOR ART The document GB 2 261 495 A which is considered to represent the closest prior art, and its Spanish equivalent ES-1019084U, describes a gas tap with a flame security device for extra-flat hob units, the control for which is located on the working surface and whose tap comprises a rod or shaft to operate the tap, linked to the rotary tap control for handling the flow regulation valve, a flame safety valve whose shaft is transversal to the tap rod, and a kinetic transmission mechanism which, during lighting, temporarily pushes on the safety valve obturator when the tap rod is moved axially. The transmission mechanism for opening the safety valve is located in a sealed chamber designed with a cover under the tap housing. DESCRIPTION OF THE INVENTION The subject of this invention is the gas tap assembly for hob units as defined in claim 1. The rod for operating the tap and the safety device are housed in the body of the tap while the transmission mechanism is located in a sealed chamber designed with a cover at the base of the tap housing. The transmission mechanism operates temporarily while the gas is being lit, when the rod moves axially. The advantages of the transmission mechanism claimed are its simplicity of construction, with just two parts, the thrust element moved by the tap rod, and the rocker operating the safety obturator. Both parts of the mechanism are moulded and are housed without play between the housing and the cover of the sealed chamber where the thrust element and rocker are coupled, fitting into each other with the aid of a guide dowel protruding from the cover. The rotation angle of the rocker operating the safety valve is limited by the obturator's maximum stroke. The operational consistency of the transmission mechanism is obtained with said guide dowel and because the rocker rotates around a pivot which also protrudes from the cover, both of which form part of said cover. DESCRIPTION OF THE DRAWINGS Figure 1 is a transverse cross-section of the gas tap according to the invention. Figure 2 is an elevated view of the gas tap according to the invention, showing the kinetic transmission mechanism. Figure 3 is a face view of the tap's safety valve and the transmission mechanism. Figure 4 is a view of the rocker operating the safety valve forming part of the transmission mechanism in figure 3. Figures 5 and 6 are two different views of the thrust element forming part of the transmission mechanism in figure 3. A DETAILED DESCRIPTION OF THE INVENTION With reference to figures 1 and 2, the preferential design of the gas tap 1 according to the invention comprises the housing 2 of the tap, the vertical rod 3 to which a rotary control is coupled - not shown in the drawings - the cone 4 distributing the flow from the control valve, the horizontal safety valve 5, the kinetic transmission mechanism 11, 12 and the sealed chamber 9 formed with the lower cover 10. The transmission mechanism 11, 12 (figure 3) for the axial movement of the rod 3 to the safety valve 5, comprises the vertical thrust element 11 (figures 5 and 6) and the operating rocker 12 (figure 4) of the safety valve (figure 3) arranged horizontally on the tap cover 10. The thrust element 11 is moved axially by the rod 3 by means of a shaft 11a partly housed in said element, but it is free to rotate relatively, and it comprises said shaft 11a and a star-shaped bushing 14 forming a part thereof and coaxial thereto. Said shaft 11a has a spring 21 around it between two washers 22, one of which is fixed, for the axial recovery of the thrust element 11. The bushing 14 is riveted to shaft 11a and has three radial wings 15 in its base that fit into the rocker 12 as shown in figure 3, forming a kinetic couple which converts the movement of the rod 3 into a movement rotating the rocker 12 around the pivot 16 emerging from the cover 10. In order to house said wings 15, the rocker 1 has a rotary plate 13 at the coupling end, which rests on the cover 10, and with three arms 17 that extend upwards to form three intermediate openings 18. To convert the movement of the wings 15 and arms 17, each has a sloping contact surface 19,20 facing the other. Said wings 15 fit into the openings guided by the dowel 23 that protrudes from the cover 10. The rocker 12 is extended by an arm 12a ending in a point which connects to the obturator 5 and facing in the direction of its movement.

Claims: A gas tap assembly for hob units including a safety device, the assembly comprising a main housing (2), a rotary rod (3) that is rotatable to adjust the desired gas flow to be supplied, and a cover (10) in the base of the tap assembly forming a sealed gas chamber (9), whereby the safety device is operated in the gas ignition phase by pushing the rod (3) in a direction along its axis, the safety device comprising a safety valve obturator (5) which when pushed moves in a direction at right angles to the axis of the rod (3), whereby the gas tap assembly further comprises a mechanism (11,12) for kinetic transmission from rod (3) to safety valve obturador by means of a rocker (12), characterised in that said kinetic transmission mechanism (11,12) comprises a trust element (11) mechanically linked to the rod (3) which moves in a direction along its axis when rod (3) is pushed, whereby trust element (11) is mechanically coupled to the rocker (12) inside the tap assembly by means of reciprocal inclined contact surfaces (19,20) provided on both the thrust element (11) and the rocker (12) which interact to activate rocker (12) when rod (3) is pushed. The gas tap assembly of claim 1, wherein said trust element (11) has a bushing (14) with radial wings (15) that fits into a rotary plate of said rocker (12), supported on the cover (10) of the tap.

Inventors: AYASTUY ARETXAGA INAKI, AYASTUY ARETXAGA, INAKI
Applicants: FAGOR S COOP, FAGOR, S.COOP
Application year: 1998
Main classification: F23N5
IPC codes: F23N5