Powered mechanical apparatus for removing frost and snow from windshield and other viewing areas
A handheld mechanized windshield scraper with a built-in blower to remove snow, ice and other material from a motor vehicle windshield and window panes. The blower tube is tapered to increase air velocity. A plurality of scraper blades is rotatably mounted on a shaft away from the blower to scrape material off of the windshield. Vents are provided in the casing for air to blow the scraped snow out from the work area. The unit can have a built-in power source or can be connected directly to the power outlet of the automobile.
The present invention relates to handheld devices for removing frost and snow from windshields and window panes of automobiles, trucks and other types of vehicles. The invention more particularly relates to handheld power operated mechanical devices to scrape frost from surfaces on automobiles and other vehicles.
BACKGROUND OF INVENTIONThe most common snow removal devices found in automobiles are simple hand-held devices having a scraper blade and/or brush on one or both ends of the handle. Generally, the hand-held devices tend to require a great deal of effort and are extremely slow in removing frost and snow, especially when the snow has hardened. To make it a little easier to remove frost and ice, heating devices generally comprising of an electrical coil and battery to power the heater element have been disclosed. The heating devices are of only slightly greater efficiency, since their power output is low and takes a long time to melt the snow on the window pane or windshield. These have been disclosed in U.S. Pat. No. 5,973,294—“Heated windshield scraper device” awarded to Michael Schatt et al., U.S. Pat. No. 5,357,646—“Heated ice scraper” awarded to David Kim, U.S. Pat. No. 4,930,176—“Combination heated scraper and brush” awarded to Gideon Gelman, 20050061793—“Ice scraper” submitted by Williams J. Deane III (patent pending), 20040148810—“Ice and snow remover” submitted by Bill Hsu (patent pending) and 20040021575—“Methods and apparatus for melting snow and ice on a vehicle” submitted by John Jeffrey Oskorep (patent pending). Because the power output of the heater is limited while the heat required to melt snow on the windshield is large, the task of removing snow from a windshield is still likely to take a considerable amount of time.
To overcome the above limitations, David Weissberger obtained a patent with U.S. Pat. No. 3,935,425 for a “Mechanized electrically heated windshield cleaner”. In this, the scraper head is moved back and forth in a straight line by a motor. At the same time, the tip of the scraper is heated using a heating element. Though this is a much better solution than the ones cited above, it also suffers from certain drawbacks. First, since it takes a relatively long time to melt snow, the heating element is ineffective. Second, since the scraper head does not have a guide, optimal scraping angle and pressure cannot be applied to the scraper head for it to do a good job. Third, since the scraper blade is not enclosed, it is not safe to work with an exposed blade. Fourth, the back and forth motion is not very efficient since the blade tip goes from zero velocity to a maximum velocity and back to zero velocity before changing its direction of movement. Fifth, to transfer a rotational motion of the motor to linear motion, a few linkages have to be used which increases the cost of manufacture. Sixth, the scraped snow will accumulate just ahead of the scraper blade and should be brushed off by the user.
SUMMARY OF INVENTIONThe primary objective of the present invention is to come up with a powered mechanical scraper that overcomes the above mentioned deficiencies so as to minimize the driver's exposure to the elements and help the driver do a better job of cleaning the front and rear windshields and window panes.
Another objective of the present invention is to make the manufacture of the improved mechanized scraper cost effective for the manufacturer to adopt it.
The foregoing objectives are attained by having a multi-blade circular scraper (so called because of the circular motion of the scraper blades) attached to one end of a motor shaft and having a protective housing around the circular scraper so that the scraping edge of the scraper and the bottom rim of the housing are at the same level. Thus the driver can apply optimal pressure on the scraper housing without damaging the scraper blades. Also, the driver is protected from injury from the rotating blades by the protective housing around the blades. The multi-blade design hastens the process of snow and frost removal from the automotive windshield and window panes.
To aid in the fast removal of the scraped snow from the work area, a fan is attached to the other end of the motor shaft, away from the scraper blades. The air blown by the fan is directed at the work area and the scraped snow is blown away from the work area through vents in the circular housing.
To make it convenient for the driver to use the unit, the scraper is powered by rechargeable battery that can be charged using the car power outlet.
In the ensuing description, frost, ice and snow are used interchangeably.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The numbering is kept consistent across
When the user wants to scrape frost off the windshield, he/she turns the switch 3 on while holding the scraper unit in such a way that the scraper blades touch the frost. In the case of the double shafted motor, this causes the motor shafts 13 and 15 to rotate, thus rotating the fan blades as well as the scraper blades. In the case of the single shafted motor, turning on switch 3 causes the motor shaft 13 to rotate, thus rotating the scraper blades as well as the fan blades. The scraper blades make a circular motion and scrape the snow. At the same time, the fan blades draw air in through the air inlet 11 and blow it on the scraped snow. The snow and air are forced out through vents 8 adjacent to the scraper blades. Once all the glass surfaces such as the front and rear windshield and window panes have been cleared of frost, the user can power off the unit and replace it in the car power outlet to charge the scraper unit for future use.
Claims
1. A mechanized handheld scraper for scraping snow, frost and ice from a surface comprising of a fan assembly to blow air on the scraped material, a reduction gear assembly, a scraper assembly connected to said reduction gear assembly, an electric motor to power said fan assembly and said reduction gear assembly, a cylindrical hollow body having a first end and a second end, said second end having an opening, a tubular hollow handle having a first end and a second end, a power source and a switch; said cylindrical hollow body housing said fan assembly, said electric motor, said reduction gear assembly and said scraper assembly; said tubular hollow handle housing said power source and said switch; said power source connected to said electric motor via said switch.
2. A cylindrical hollow body of claim 1 where said cylindrical hollow body has a plurality of vents on its circumference close to said second end for scraped material to be blown out.
3. A cylindrical hollow body of claim 2 where said cylindrical hollow body is uniform in diameter.
4. A cylindrical hollow body of claim 2 where said cylindrical hollow body is tapered from said first end to said second end.
5. A cylindrical hollow body of claim 2 where said cylindrical hollow body has an opening at said first end for air inlet; said opening covered by a permeable membrane.
6. A fan assembly of claim 1 where said fan assembly is an axial flow fan; said axial flow fan drawing air from said opening at said first end in said cylindrical hollow body.
7. A cylindrical hollow body of claim 2 where said cylindrical hollow body has an opening along the circumference near said first end for air inlet; said opening covered by a permeable membrane.
8. A fan assembly of claim 1 where said fan assembly is a radial flow fan; said radial flow fan drawing air from said opening near said first end in said cylindrical hollow body.
9. A reduction gear assembly of claim 1 where said reduction gear assembly has a first end on a first plane, a second end on a second plane; said first plane parallel to said second plane; said first end accepting circular motion as input; said second end providing circular motion as output; said output angular velocity less than said input angular velocity.
10. A scraper assembly of claim 1 where said scraper assembly has one scraper blade connected radially to a scraper blade assembly shaft; said scraper blade having a radial length less than the radius of the inner circle inscribed by said second end of said cylindrical hollow body.
11. A scraper assembly of claim 10 where the scraping edge of said scraper blade assembly is substantially on the same plane as said second end of said cylindrical hollow body.
12. A scraper assembly of claim 11 where said scraper blade is flat.
13. A scraper assembly of claim 11 where said scraper blade is curved.
14. A scraper assembly of claim 1 where said scraper assembly has a plurality of scraper blades connected radially to a scraper blades assembly shaft; said scraper blades having substantially the same angular distance between consecutive blades; said scraper blades having substantially the same linear length; said scraper blades having a radial length less than the radius of the inner circle inscribed by said second end of said cylindrical hollow body.
15. A scraper assembly of claim 14 where said scraper blades have their scraping edges on substantially the same plane; said plane of said scraping edges being substantially the same as the plane of said second end of said cylindrical hollow body.
16. A scraper assembly of claim 15 where the radial ends of said scraper blades are connected to a ring to prevent deflection of said scraper blades; bottom plane of said ring being above said plane of said scraping edges.
17. A scraper assembly of claim 16 where said scraper blades are flat.
18. A scraper assembly of claim 16 where said scraper blades are curved.
19. A scraper assembly of claim 18 where said scraper blades are curved in the same direction by the same angle.
20. A tubular hollow handle of claim 1 where said first end of said tubular hollow handle is attached to said first end of said cylindrical hollow body; said tubular hollow handle having an axis at an angle to the axis of said cylindrical hollow body.
21. A power source of claim 1 where said power source is a battery of rechargeable cells internal to said mechanized handheld scraper.
22. A power source of claim 1 where said power source is external to said mechanized handheld scraper.
Type: Application
Filed: Jun 15, 2005
Publication Date: Dec 21, 2006
Inventor: Narayanan Subramanian (Marietta, GA)
Application Number: 11/160,253
International Classification: A47L 9/06 (20060101); A47L 5/14 (20060101);