Safety device for a lighting valve of a gas burner
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F23Q-009/08
F23Q-009/00
F23D-014/72
출원번호
US-0102275
(2005-04-08)
등록번호
US-7252109
(2007-08-07)
우선권정보
IT-TO2004A0218(2004-04-08)
발명자
/ 주소
Colombo,Pierangelo
출원인 / 주소
Industrias Unidas S.A. DE C.V.
대리인 / 주소
Baker & McKenzie LLP
인용정보
피인용 횟수 :
3인용 특허 :
4
초록▼
A safety device (61) for a lighting valve (23) of a gas burner, comprising a starting button (36), a return spring (57), a cutoff shutter (42) controlled by the starting button (36), a control shutter (41) for a pilot light nozzle, and a holding electromagnet (54) for the control shutter (41). The c
A safety device (61) for a lighting valve (23) of a gas burner, comprising a starting button (36), a return spring (57), a cutoff shutter (42) controlled by the starting button (36), a control shutter (41) for a pilot light nozzle, and a holding electromagnet (54) for the control shutter (41). The control shutter (41) is normally closed and is actuatable through the starting button (36) for the flowing of the gas to the pilot light nozzle, whilst the holding electromagnet (54) is dependent on the pilot light to hold open the control shutter (41). The starting button (36) is provided for rotation and can be depressed only for a given angular start position so that, for starting the lighting, the button (36) must be rotated up to said start position and subsequently depressed to close the cutoff shutter (42) and open the control shutter (41). There are provided a hooking condition and an unhooked condition for the starting button: in the hooking condition, the cutoff shutter (42) is closed and the control shutter (41) is open under the control of the holding electromagnet (54) without being influenced by the starting button (36); and, in the unhooked condition, the starting button (36) can return to the lifted position to open the cutoff shutter (42) for the flowing of the gas to the burner, the unhooked condition requiring a further rotation of the starting button (36) spaced away from the angular start position.
대표청구항▼
The invention claimed is: 1. A safety device (61) for a lighting valve (23) of a gas burner (16), comprising a starting button (36) provided for depression, a return spring (57) for returning the starting button (36) to a lifted position, a cutoff shutter (42) controlled by the starting button (36)
The invention claimed is: 1. A safety device (61) for a lighting valve (23) of a gas burner (16), comprising a starting button (36) provided for depression, a return spring (57) for returning the starting button (36) to a lifted position, a cutoff shutter (42) controlled by the starting button (36) and arranged upstream of the burner (16), a control shutter (41) for a pilot light nozzle (17), and a holding electromagnet (54) for said control shutter (41) wherein the control shutter (41) is normally closed and is actuatable through the starting button (36) for the flowing of the gas to the pilot light nozzle (17), whilst the holding electromagnet (54) is dependent on the pilot light to hold open said control shutter (41), said safety device (61) being characterized in that the starting button (36) is provided for rotation and can be depressed only for a given angular start position so that, for starting the lighting, the button (36) must be rotated up to said start position and subsequently depressed to close the cutoff shutter (42) and open the control shutter (41), whereby allowing the flowing of the gas to the pilot light nozzle (17); said safety device (61) providing a hooking condition and an unhooked condition for the starting button (36), wherein, in the hooking condition, the cutoff shutter (42) is closed and the control shutter (41) is open under the control of the holding electromagnet (54) and without being influenced by the starting button (36); and wherein, in the unhooked condition, the starting button (36) can return to the lifted position under the action of the return spring (57) to open the cutoff shutter (42) for the flowing of the gas to the burner (16), said unhooked condition requiring a further rotation of the starting button (36) spaced away from said angular start position. 2. Safety device (61) according to claim 1, characterized in that it comprises a pin element (67) arranged in an angularly fixed position and which normally prevents the depression of the starting button (36), whilst said button (36) has a longitudinal notch (76), which can be lined up with the pin element (67) in said start position, and wherein the longitudinal notch (76) can slidably receive said pin element (67) for allowing the depression of the starting button. 3. Safety device (61) according to claim 2, characterized in that said pin element (67) is lodged in a seat of guide (84) with possibility of shifting toward a longitudinal axis of the button (36), whilst a radially acting spring (88) pushes the pin element (67) toward said axis; wherein the longitudinal notch (76) is defined by two sides of guide and by a bottom, said bottom including an inclined ramp-like section, a descending step section (81) and a basis section (82) adjacent to the step section (81); and wherein, in the lifted position of the button (36), an end (86) of the pin element (67) projects from the seat (84) and, as soon as the staring button (36) lowers, said end (86) is caused to reenter in the seat (84) by the inclined ramp-like section and against the action of the radially acting spring (88); the depression of the button (36) continuing, the radially acting spring (88) being provided for snap moving the pin element (67) from the step section (81) to said basis section (82), whereby determining the hooking condition of the starting button (36); and said pin element (67) constituting an arrest for said descending step section (81) such to prevent the return spring (57) to return the starting button (36) to its lifted position. 4. Safety device (61) according to claim 3, characterized in that the starting button (36) further includes a transversal notch (77), which crosses said longitudinal notch (76) adjacent to the step section (81) and provided for being employed by said pin element (67); wherein said transversal notch (77) extends for a predetermined angle and has a bottom defined by said basis section (82) and by at least one transversal ascending section (83a, 83b) adjacent to said basis section; and wherein said predetermined angle is associated to the further rotation of the starting button (36) such that said further rotation causes the reentry of the pin element (67) in the seat (84) by said transversal ascending section with disengagement of the pin element from the transversal notch (77) in said unhooked condition. 5. Safety device (61) according to claim 1, characterized in that it is included in a starting group (68) which is mounted on a valve body (33), said group comprising an actuating stem (56) for the starting button (36) and a guide sleeve (69) for said stem (56) and in which the cutoff shutter (42) is slidably mounted on said stem and is arrested against stop elements (71) of the actuating stem by a holding spring (72) opposed by said sleeve (69). 6. Safety device (61) according to claim 3, characterized in that it is arranged in a starting group (68) comprising an actuating stem (56) for the starting button (36) and a guide sleeve (69) for said stem (56), and wherein the cutoff shutter (42) is slidably mounted on said stem and is arrested against stop elements (71) of the stem (56) by a holding spring (72) opposed by the sleeve, said seat of guide (84) being provided in the guide sleeve (69) and said radially acting spring (88) being mounted on said sleeve. 7. Safety device (61) according to claim 6, characterized in that the guide sleeve (69) comprises an annular notch (89) also defining said seat of guide (84) and in which the radially acting spring (88) is constituted by an elastic annular leaf lodged in said annular notch (89) and having a section (91) engaging in a hole of said annular notch and another section adapted to cooperate with another end of said pin element (67). 8. Safety device (61) according to claim 5, characterized in that the guide sleeve (69) is locked in a cylindrical hollow section (92) of the valve body (33) and in which there is provided a gastight "O" ring (93) interposed between an annular notch of the sleeve and said cylindrical section (92). 9. Safety device (61) according to claim (5), characterized in that it comprises a pin element (67) arranged in an angularly fixed position and which normally prevents the depression of the button (36), and wherein the starting button (36) has a longitudinal notch (76) which can be lined up with the pin element (67) in the said angular starting position, wherein said longitudinal notch (76) can slidably receive said pin element (67) for allowing the depression of the said button (36), and wherein the starting button (36) includes a hub (63) on which said notch (76) is formed, said guide sleeve (69) having a terminal section (94) with a guide for the sliding of the actuating stem (56) and a vane (96) adapted to receive a portion of said hub (63), the return spring (57) being lodged in said vane (96), around the stem, interposed between said terminal section (94) and a seat (97) of said hub (63). 10. Safety device (61) according to claim 9, characterized in that it further includes a gastight "O" ring (98), which is interposed between a gasket seat of the sleeve and said actuating stem (56) and wherein said gasket seat is obtained in said vane (96) and is opposed by the return spring (57) of the starting button (36). 11. Safety device (61) according to claim 5, characterized in that, in the hooking condition (FIG. 4C) of the starting button (36), the cutoff shutter (42) is disengaged from the stop elements (71) and closes a seat shutter (49) for the burner (16) under the action of its holding spring (72). 12. Safety device (61) according to claim 5, characterized in that the cutoff shutter (42) is formed by a gastight disk (99) in resilient material and by a spring holding disk (101), in which said gastight disk (99) includes a surface opposed by the said stop elements (71) and a hub (102), wherein said hub (102) is slidable in gastight manner along said actuating stem (56), and wherein the spring holding disk (101) is shaped for receiving an end of the holding spring (72) and provides a hole in which the hub (102) of the said gastight disk (99) is lodged. 13. Safety device (61) according to claim 5, characterized in that it is used in a lighting valve in which said control shutter (41) comprises a gastight disk (51) and a contrast head (52), wherein said gastight disk (51) is spring urged toward the position of closing and in which the contrast head is actuatable by the actuating stem (56) of the starting button (36) in its depressed position, said actuating stem (56) being spaced away from said contrast head (52) in the hooking position at the starting button (36). 14. Safety device (61) according to claim 5, characterized in that the valve body (33) comprises an inlet (37) for the input of the gas, an input chamber (44), an intermediate chamber (46), a cutoff chamber (47), a duct (38) for the pilot light, and an output duct (39) for the gas burner (16); wherein the input chamber (44) is gas connected with said inlet (37), the duct for the pilot light is gas connected with said intermediate chamber (46), and the output duct (39) is gas connected with said cutoff chamber (47); and wherein the intermediate chamber (46) is interposed between the input chamber (44) and the cutoff chamber (47) and is gas connected with the input chamber (44) through a seat (48) for the control shutter (41), and with the cutoff chamber (47) through a seat (49) for the cutoff shutter (42); in the condition of closing of the control shutter (41), the intermediate chamber (46) being gas insulated from the inlet (37) and, in the condition of closing of the cutoff shutter (42), the cutoff chamber (47) and the output duct (39) are insulated from the inlet (37). 15. A safety device (61) for a lighting valve (23) of a gas burner (16), comprising a starting button (36) and a return spring (57) for the starting button, said device being characterized in that it further comprises a hub (63), associated with the starting button (36) and having an annular shoulder (78), a longitudinal notch (76) which interrupts said annular shoulder and a transversal notch (77) which crosses said longitudinal notch; a contrast element (67) arranged on the trajectory of depression of the hub (63) so as to normally prevent the depression of the button (36) and in which said longitudinal notch (76) can be lined up with the contrast element (67) for a predetermined angular start position of the button (36) so as to allow the depression of the said button (36); a hooking section (81) in said longitudinal notch (76) engageable by said contrast element (67) to hold back in a hooking condition said button (36) against the action of the return spring (57); and an unhooking section (ascending sections 83a and 83b) in said transversal notch (77) engageable by the contrast element in response to a further rotation of the starting button (36) for an action of disengagement from the hooking section (81) which allows the lifting of the starting button (36) by the return spring (57). 16. Safety device (61) for a lighting valve (23) according to claim (15) further comprising a control shutter (41) which is actuatable through the starting button (36), a holding electromagnet (54) for said shutter depending on the pilot light and a cutoff shutter (42) depending on the starting button (36) and arranged upstream of the burner (16), the said device being characterized in that the depression of the starting button (36) allowed by the longitudinal notch (76) ensures the opening of the control shutter (41) for the lighting of the pilot light; and the hooking condition puts the starting button (36) in an operational state in which the cutoff shutter (42) is closed and the control shutter (41) is open under the control of the holding electromagnet (54); the lifting of the button (36) by the return spring (57), after the unhooking, ensuring the opening of the cutoff shutter (42) for the flowing of the gas to the burner (16) and under the control of the pilot light.
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이 특허에 인용된 특허 (4)
Harniet, Uwe, Gas valve with a thermoelectric security device.
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