Steam iron water tank with air trap and gear mounts

Abstract: A steam iron (10) having a water tank (29) with an internal air trap (130) and external gear mounts (110,112). The air trap (130) holds a volume of air when the iron is being filled with water, but receives water when the iron is moved to a horizontal position to prevent water from spilling out of a water fill spout (114). The iron has gears (66,68) that connect a temperature control (26) of the iron to a water metering valve (32). The gears (66,68) are stabily rotatably mounted directly to the water tank (29) on the gear mounts (110,112).

Description: The present invention relates to steam irons and, more particularly, to a steam iron with an improved water tank. US Patent 4,688,340 discloses an iron with a water reservoir in a handle. US Patent 5,138,778 discloses a water reservoir with a large rear portion. US Patent 5,138,778 discloses an open area in a top, middle of a water tank. US Patent 4,870,763 discloses a housing with a sliding gear mounting area. US Patent 4,688,340 discloses a knob mounted on a raised ring surface. In accordance with the present invention, a steam iron is provided comprising a soleplate, means for heating the soleplate, and a water tank for holding water to be delivered onto the soleplate, the water tank having a water fill inlet that is connected to a water fill spout of the iron, and wherein a portion of a water holding volume of the water tank is located above a portion of the water fill spout when the iron is in a horizontal position. The water tank further comprises an air trap that holds a volume of air when the iron is in a vertical position and being filled with water. The air trap receives water when the iron is moved to a horizontal position to prevent water from spilling out of the fill spout. The foregoing aspects and other features of the invention are explained in the following description, taken in connection with the accompanying drawings, wherein: Fig. 1 is a perspective view of an iron incorporating features of the present invention; Fig. 2 is a schematic cross-sectional view of the lower front portion of the iron shown in Fig. 1; Fig. 3 is a perspective view of the water tank used in the iron shown in Fig. 1; Fig. 4 is an elevational side view of the water tank shown in Fig. 3; Fig. 5 is a cross-sectional view of the water tank shown in Fig. 3. Referring to Fig. I, there is shown a perspective view of a steam iron 10 incorporating features of the present invention. Although the present invention will be described with reference to the single embodiment shown in the drawings, it should be understood that features of the present invention can be embodied in various alternative embodiments of steam irons. In addition, any suitable size, shape or type of elements or materials could be used. The iron 10 generally comprises a soleplate 12, a housing 14, a temperature control knob 16, a spray button 18a and a surge button 18b. Referring also to Fig. 2 a partial cross-sectional view of the front of the iron is shown. The soleplate 12 has a raised wall 24 in a general triangular shape that forms the side walls for the steam chamber 20. A cover 22 is attached to the top of the wall 24 to form the top of the steam chamber. A thermostat 26 is mounted on the soleplate 12 and connected to the temperature control knob 16 by the shaft 28. The housing 14 includes a water tank 29 that forms a water reservoir 30. A valve 32 is provided between the reservoir 30 and the soleplate 12. The valve 32 includes a valve body or member 34 and a valve stem 36. The valve member 34 is mounted on the steam chamber cover 22 and forms a valve seat 37. The water metering valve is described in greater detail in U.S. patent application No. 08/716,962. The top section of the stem 36 has a rim 58 and a stud 64. The temperature control shaft 28 is connected to the valve stem 36 by two gears 66, 68. The first gear 66 is connected to the shaft 28 such that axial rotation of the shaft 28 axially rotates the first gear 66. The second gear 68 is mounted on the top stud 64 of the valve stem 36. The two gears 66, 68 have relatively broad outer perimeters 70, 72 with teeth 74, 76, respectively. The teeth 74, 76 are intermeshed at a junction 78 of the two gears. The stud 64 has a keyed shape. The bottom center of the second gear 68 has a keyed aperture. The stud 64 is located in the aperture such that axial rotation of the second gear 68 axially rotates the valve stem 36. A spring 60 is provided in a spring cavity. The spring 60 is in contact with the bottom of the rim 58 and biases the valve stem 36 in an upward direction. The bottom of the second gear's center rests against the top of the rim 58. Therefore, the second gear 68 is also biased in an upward direction. The top center of the second gear 68 has a rider protrusion 82. As seen best in Figs. 1 and 2, mounted to the housing 14 is a user actuatable selector 84. The selector 84 is a lever pivotally mounted to the housing 14 at pivot 86 and movably captured by a portion of the housing 14. Located on the bottom of the selector 84 is a cam section 90 that projects through a hole 92 in the housing 14. The biasing action of the spring 60 biases the rider protrusion 82 against the bottom surface of the cam section 90. The bottom surface of the cam section 90 forms a cam surface. A skirt 100 is mounted on the soleplate. On top of the skirt 100 is the water tank 29. Referring also to Fig. 3, a perspective view of the water tank 29 is shown. The water tank 29 is comprised of two pieces; a top piece 102 and a bottom piece 104. The top piece 102 includes a front end 106 with a water fill inlet 108. The water fill inlet 108 is connected to a fill spout 114 of the housing 14. In the embodiment shown, the housing 14 has a pivotable door 116 that covers the entrance to the fill spout 114. The top piece 102 also includes two integral gear mounts 110 and 112. The first integral gear mount 110 has a raised ring or collar 33. The second integral gear mount 112 has a second raised ring or collar 35 and a raised perimeter shell 37. The first collar 33 has the first gear 66 stabily rotatably mounted directly thereon. The second gear mount 112 has the second gear 68 stabily rotatably mounted directly thereon. More specifically, the bottom center 69 of the second gear 68 projects into the second raised collar 35 and a majority of the side perimeter of the second gear 68 is supported by the raised perimeter shell 37. The second gear mount 112 is adapted to allow the second gear 68 to longitudinally move up and down in the second gear mount 112. Referring also to Fig. 4, an elevational side view of the water tank 29 is shown. The rear end 118 of the water tank 29 has an elevated section 120. The elevated section 120 has a portion of the reservoir or water holding volume of the water tank. With the iron in a horizontal position, the elevated section 120 is located above, at least partially, the water fill inlet 108 and the fill spout 114. A portion of the water holding volume is thus located above the fill spout 114 when the iron is in a horizontal position. In order to prevent water from spilling out the fill spout 114, after the tank is filled with water and moved to a horizontal position, the water tank 29 has been provided with an air trap that functions as a spill dampener. Referring also to Fig. 5, a perspective cross-sectional view of the water tank 29 is shown. The front of the water tank 29 has a thermostat receiving area 122 extending up from its bottom. The front of the tank also has a dividing wall 124. The tank 29 thus forms a water entry point 126, a left side water entry flow path 128, and a right side air trap 130. In order to fill the iron with water, the user opens the door 116 and places the fill spout under a water faucet in a generally vertical position. Water from the faucet enters the tank at the inlet 108, into the entry point 126 and down the flow path 128. As the water fills the reservoir 30, it forms an air pocket in the air trap 130. This air pocket prevents water from entering the air trap 130 while the iron is being filled with water. After the tank 29 is filled, the user closes the door 116 and can move the iron to a horizontal position for ironing. When the iron is moved towards a horizontal position the water in the elevated section 120 moves down and is replaced by the air from the air trap 130. The air trap 130 thus now receives water to substantially prevent the water from spilling out the fill spout 114. The elevated section 120 of the water tank 29 has been provided to increase the water holding capacity of the water tank 29 without increasing the length and width of the tank. To compensate for the possible problem of spilling of water out of the iron when the iron is moved to a horizontal position, the air trap 130 has been provided. Thus, the water tank can have a water holding volume located above the water entry fill spout of the iron to increase the water holding capacity of the tank without increasing the size of its footprint.

Claims: A steam iron (10) having a soleplate (12), and a water tank (29) for holding water to be delivered onto the soleplate (12), the water tank (29) having a water fill inlet (108), the inlet (108) being connected to a water fill spout (114) of the iron, a portion (120) of a water holding volume of the water tank (29) being located above a portion of the water fill spout (114) when the iron is in a horizontal position, characterized by : the water tank (29) further comprising an air trap (130) that holds a volume of air when the iron is in a vertical position and being filled with water, wherein the air trap (130) receives water when the iron is moved to a horizontal position to prevent water from spilling out the fill spout (114). An iron as in Claim 1 wherein the water fill inlet {108) is at a first end (106) of the water tank (29) and the portion (120) of the water holding volume located above the fill spout (114) is located at an opposite second end (118) of the water tank. An iron as in Claim 2 wherein the air trap (130) is located at the first end (106) of the water tank (29). An iron as in Claims 2 or 3 wherein the water tank (29) has an area (122) proximate the first end (106) for receiving a portion of a thermostat (26) of the iron and wherein the air trap (130) is located on a first side of the thermostat receiving area (122) and a water entry path (128) from the water fill inlet (108) is located on a second opposite side of the thermostat receiving area (122). An iron as claimed in any one of the preceding claims further comprising gears (66,68) connecting a temperature control (26) of the iron to a water metering valve (32) disposed between the water tank (29) and the soleplate (12). An iron as in any one of the preceding claims wherein the water tank (29) further comprises integral gear mounts (110,112) for stabily mounting gears (66,68) directly onto the water tank (29). An iron as in Claim 6 wherein a first one (110) of the gear mounts (110,112) comprises a first raised collar (33) for rotatably mounting a first gear (66) directly on the raised collar. An iron as in Claim 7 wherein a second one (112) of the gear mounts (110,112) comprises a raised perimeter shell (37) surrounding a majority of a side perimeter of a second gear (68). An iron as in Claim 8 wherein the second gear mount (112) further comprises a second raised collar (35) with the second gear (68) directly rotatably mounted on the second raised collar (35). An iron as in Claim 9 wherein the second gear (68) is longitudinally movable on the second raised collar (35) and along the raised perimeter shell (37).

Inventors: KUBICZ EDWARD M, MARCHETTI MICHAEL J, KUBICZ, EDWARD M., MARCHETTI, MICHAEL J.
Applicants: BLACK & DECKER INC, BLACK & DECKER INC.
Application year: 1997
Main classification: D06F75
IPC codes: D06F75