Hair drying device with reduced sound emissions

Abstract: A hot air blower such as a hair dryer utilizes an inner body (11) with an inlet (26), sides and a front outlet end (28). The inner body houses a heater (24), a motor (16) and a fan (22). The motor rotates the fan so that air is drawn in the back inlet (26) end, heated and forced out through the front outlet end (28). A muffler (14) surrounds the inlet (26) and sides of the inner body (11), but does not cover the opening (28) in the outlet. At least one, and preferably two, air openings (32) are disposed on the muffler (14) and are preferably positioned a predetermined distance from the front end, facing the front end.

Description: The present invention relates generally to hand-held hot air blowing devices, such as blow dryers or hair dryers. More specifically, it concerns a hair dryer for drying hair which is less noisy than conventional devices. BACKGROUND OF THE INVENTION Hair dryers and blow dryers are well known in the prior art. Conventional blow dryers utilize a tubular body secured to a handle. The body holds a heating element and a motor that rotates a fan. In operation, the rotation of the fan draws air into the body through an inlet located at the back end or sides of the body. The fan then blows the air past the heating element to warm the air. Finally, the heated air is blown out of the dryer through an outlet at the front end of the body. However, the motor and the high speed rotation of the fan typically generate noise that escapes the dryer body through the outlet, inlets, vents or other openings in the body, as well as the wall of the body itself. The document PATENT ABSTRACTS OF JAPAN vol. 1996, n° 07, 31 July 1996 (1996-07-31) & JP 08 056738A (KYUSHU HITACHI MAXELL LTD), 5 March 1996 (1996-03-05), discloses a hair drying device, comprising : an inner body having an air inlet on its upper side, one outlet on its lower side and means for drawing air through said inner body ; and an outer muffler which surrounds said inner body, including said air inlet, but not said air outlet, said muffler being separated from said inner body by an airspace, said muffler having at least one air opening positioned on said muffler at a distance from said air outlet. The main body case is directly hand-held by the user and the air openings are positioned not to be closed by the user's hand. Whether at home or in a professional setting, such as a hair salon, hair dryers are used to blow dry hair after cleaning and/or wetting the hair. The device is used near the person's ears, so the noise is at least a nuisance. Moreover, at home this is often accomplished early in the morning or late in the evening, when it would be helpful to have a quiet hair dryer so as not to disturb other people in the house, such as a sleeping spouse or child. In professional settings, a large number of hair dryers may be operating at once, creating noise levels that may be so loud that it is difficult for the hair stylists and customers to hear each other talk. Thus, there is a need for dryers which are less noisy than typical dryers. This noise can also be a problem with other hot air gun applications. For example, paint guns that blow air may be too loud to use during certain times in residential neighborhoods. The inventor contemplates that any air blowing device may need quieter operation in certain situations. Accordingly, one object of the present invention to provide a new and improved blow dryer. Another object is to provide a new and improved blow dryer that creates a relatively low level of sound emissions. Still another object is to provide a new and improved hair dryer which is relatively quiet. SUMMARY OF THE INVENTION These and other objects are met or exceeded by the present blow dryer. The invention utilizes an inner body with an air inlet usually in a back end of the body, sides and a front outlet end. The inner body houses a heater, a motor and a fan. The motor rotates the fan so that air is drawn in the inlet, heated and forced out through the outlet. A muffler surrounds the back end and sides of the inner body, including the air inlet, but does not cover the opening in the outlet. At least one, and preferably two, air openings are disposed on the muffler and are preferably positioned a predetermined distance from the front end, facing the front end. More specifically, the present hair drying device includes an inner body having an air inlet, an air outlet and means for drawing air through said inner body, and a muffler which surrounds said inner body, including said air inlet, but not said air outlet, said muffler being separated from said inner body by an airspace, said muffler having at least one air opening positioned on said muffler at a distance from said air outlet, characterized in that said air opening faces a front end of the device. Internal noise is absorbed by said muffler, without excessive recirculation of heated air. BRIEF DESCRIPTION OF THE DRAWINGS The above mentioned and other features of this invention and the manner of obtaining them will become more apparent and the invention itself will be best understood by reference to the following description taken in conjunction with the drawings, in which: FIG. 1 is a side view and partial section view of a blow dryer, made in accordance with the principles of this invention, showing the direction of airflow in the dryer; and FIG. 2 is a top and side isometric view of the blow dryer of FIG. 1, also showing the direction of airflow. DETAILED DESCRIPTION OF THE INVENTION Referring now to FIGs. 1 and 2, a blow dryer 10 has an inner body 11, a handle 12 and a muffler 14. The inner body 11 houses a motor 16 powered by a source 18 through a switch 20, a fan 22 which is turned by the motor 16, and a heater 24 which is also powered by the source 18. The body 11 has an air inlet 26 at a back end of the body, and an air outlet 28 at the front end. The muffler 14 surrounds and encloses the inner body 11, while maintaining an air space 30 between the inner body 11 and the muffler 14. The muffler 14 can extend to the outlet 28, or behind the outlet 28 at a line 29, as in the drawings. For an inner body about 8-10 inches (20.3-25.4 cm) long, the line 29 can be about 3 to 2 inches (7.6 to 5.1 cm) behind the outlet 28. The air space 30 can be about d-1 inch (2.5 cm) wide between the inner body 1 and the muffler 14. In either case, for the most part, only the air outlet 28 is exposed by the muffler 14. Air enters the air space 30 through air openings 32 in the muffler 14, which are preferably located near, yet are removed from the air outlet 28. A sloped surface 33 can be provided in the muffler 14 to allow the openings 32 to face the air outlet 28, if desired. The openings can also simply be raised to face the outlet, as shown. The openings 32 can be about 1.5 to 3 inches (3.8 to 7.6 cm) from the outlet 28, or any other suitable distance. It is not expected that much pre-heated air will be drawn in the air openings 32, although that is possible. The handle 12 may be any suitable shape, and houses the switch 20. Preferably, the handle 12 can easily be used in both the left and the right hands. In operation, air drawn into the inlets 32 (depicted by arrows 34 in FIG. 1) is drawn toward the back end 26 by the fan (as depicted by arrows 36 in FIG. 1). The suction of the fan then reverses the direction of the drawn air (as depicted by arrows 38 in FIG. 1), and propels the air toward the air inlet 26, past the motor 16 and heating element 24 and out through the outlet 28 (as depicted by arrows 40). Noise is absorbed and dissipated by the muffler 14 and the air space 30, which significantly reduces the noise generated by the device.

Claims: A hair drying device, comprising : an inner body (11) having an air inlet (26), an air outlet (28) and means (22) for drawing air through said inner body ; and a muffler (14) which surrounds said inner body (11), including said air inlet (26), but not said air outlet (28), said muffler being separated from said inner body (11) by an airspace (30), said muffler (14) having at least one air opening (32) positioned on said muffler at a distance from said air outlet, characterized in that said air opening faces a front end of the device. The hair drying device according to claim 1, wherein said at least one air opening (32) is disposed on said muffler (14) so that incoming air is provided to said air inlet (26) in a second direction (36) which is distinct from a first direction (40) along which air is propelled by said air-drawing means (22). The hair drying device according to claim 2, wherein said at least one air opening (32) is disposed on said muffler so that said first direction is generally reverse to said second direction. A hair drying device according to one of claims 1 to 3, further comprising a heater (24). A hair drying device according to one of claims 1-4, further comprising a handle (12). A hair drying according to one of claims 1-5, wherein said at least one air opening (32) is at a distance behind said air outlet (28).

Inventors: ALTAMORE NICOLO, ALTAMORE, NICOLO
Applicants: WAHL CLIPPER CORP, WAHL CLIPPER CORPORATION
Application year: 1999
Main classification: A45D20
IPC codes: A45D20