FORM-2
THE PATENTS ACT, 1970
(38 of 1970)
COMPLETE SPECIFICATION
[See Section 10, Rule 10]
Title :"Shaving Device with Multiple Unequally Spaced Blades"
Laser Shaving (India) Pvt Ltd.
Having its office at
5th Floor, Malhotra House,
Opp. G.P.O., Fort,
Mumbai 400 001, Maharashtra, India

Abstract:
The invention consists of a product called Shaving Device with Multiple Unequally Spaced Blades that has its shaving edges in the form of blades spaced unequally apart from each other. The gaps between the blades are different The first gap between first blade edge (bottom blade) and second blade edge from the bottom and the second gap i.e. the gap between the second and third blade edge from the bottom, are not of equal measurement value.
Full Specification:
The following specifications particularly describe the nature of this invention and the description thereof.
Title of the Invention:
"Shaving Device with Multiple Unequally Spaced Blades"
Definitions:
1. Axes (Dimensions) in Relation to the Multiple blade Shaving Head:
For the purpose of this patent specification, the three Dimensions in relation to the multiple blade (hereinafter called 'multiblade') shaving head is defined in the following manner:
X axis - along the edge of the blade
Y axis - perpendicular to the blade edge
XY plane - the plane parallel to the base of the shaving head
Z axis -- Vertical to the XY plane
Fig, 1 shows the axes (Dimensions) in the diagram:
No. 1 is the base of the multiblade shaving head. No. 2 is shaving surface. No. 3 shows the 5 blades which are assembled inside the shaving head. The edges of the 5 blades are parallel to each other. No. 4 is the X axis parallel to the edges of blades. No. 5 is the Y axis is perpendicular to the line of the blade edge and No. 6 is the Z axis which is perpendicular to base No. 1 of the shaving head which is in the XY plane.

2. Multiblade Shaving Head:
A device in the nature of plastic body on which three or more razor blades are assembled with spacers to form a shaving unit, often called a cartridge in common parlance. The shaving head is capable of being mounted on a suitable handle for holding the shaving head in position for shaving the beard of a person.
3. First Blade: The blade at the bottom of the shaving head when held in position for shaving on the cheek of the face.
4. Second Blade: The second blade from the bottom of the shaving head when held in position for shaving on the cheek of the face. The second blade is just on top of the first blade.
5. Third Blade: The third blade from the bottom of the shaving head when held in position for shaving on the cheek of the face. The third blade is just on top of the second blade.
6. First Gap: The vertical space or distance between the first blade and the second blade measured in the Z dimension.
7. Second Gap: The vertical space or distance between the second blade and the third blade measured in the Z dimension.
Background of the Invention
About 2 decades ago, a leading manufacturer of blades introduced a twin blade shaving head which for the first time had 2 shaving edges on the same side of the shaving device. Both the blades were held together in a plastic body and shaved in tandem at the same time. The market readily accepted the product and soon most of the leading manufacturers came to die market with Similar products. Thereafter there was a race in developing shaving heads with multiple shaving edges. Now there are shaving systems with 3, 4, 5 and even 6 blade edges on die shaving head.
Introduction of multiple edges has increased the hazard of shaving as the face is being subjected to proportionately more risk of damage to the skin. In this context, the need and function of these multiple blade edges was critically examined with a view to make a better product for shaving.

The function of the first pair of blades has been studied extensively for the twin track shaving head by the industry. The first blade enters and shaves the hair and during the process the hair gets slightly pulled out of its follicle. While the stem of the hair is still protruding, the second blade cuts it further and thus the pair of blades gives a close shave.
However in case of a shaving head having 3 or more shaving edges, during the shave by the second blade, the hair does not get any further pulled out as it is held back by the withholding force exerted by the follicle. The function of third blade and the subsequent blades in prior art was found to be ambiguous.
The present invention defines the role of the third and subsequent blades on the multiblade shaving head to make a product under the invention which is better for shaving. The main feature of the product under this invention is that the gaps between the blade edges are unequal so that the blade edges are not equally spaced one behind the other while shaving.
The Reasoning behind the Invention
During the act of shaving, the surface of the skin with the hair distorts its shape as it undergoes the stress of the shaving process. The facial surface is constantly readjusting to regain its original position in the microseconds that follow. The time varies as the process of shaving may be performed by fast strokes and or by slow strokes, with light or heavy pressure on the skin.
In case of a rapid or a fast shaving stroke, the first blade exerts a push on the skin, stretching it behind the blade in the first gap. This exposes the stem of the cut hair to the second blade which cuts it further. The skin is still stretched when the third blade strikes it It is the intent of this invention to allow different amounts of time to the skin and hair to adjust between the blade strikes. The invention achieves this by varying the distance between the three edges. The facial surface thereby exposes the hair to the blade in different configurations for the second and the third blade, which results in a closer shave.
In case of the slow stroke, the blade edges exert a pressure on the skin pressing it down, and the skin slightly bulges in between the two blades. The height of the bulge is dependent on the distance between the edges. The smaller the distance, the smaller is the bulge. With the bulge, the hairs also are pushed up with the bulge. The second blade therefore is

able to reach the bottom of the hair and shave closer than the first blade. Since the bulge height is dependent on the gap between the blades, the height of the bulge is increased by the increased distance between the blades with a larger gap. Thus with the Second gap bigger than the First gap, the third blade gets to cut the hair closer to the base than was possible for the second blade.
Similar result can be achieved by having the First gap bigger than die Second gap in which case the bulge of die facial surface is larger in the first gap than the Second gap. This configuration is more suited for thin beard types.
The invention optimises the shaving device to give a clean shave without compromising on the safety of the skin. The invention creates a shaving head in which the first pair of blades gives the primary shave, and subsequent blade(s) give a finishing touch to the shaving process.
Description of the Product in the Invention
The invention discloses die design of the "Shaving Device with Multiple Unequally Spaced Blades" and describes distinguished features of the Product
Process of making the Product in this invention:
A multiblade shaving head in prior art is made by producing plastic base with injection moulding machines, stamping out metal spacers, and producing the shaving edges in a razor blade factory.
The modification to the process for the present invention is that the spacers are stamped out from sheets or rolls of desired thickness related to die design of die invention and not from a standard thickness as in prior art
In prior art die spacers are of uniform thickness, whereas in die present invention die spacers are of thickness equal die gaps designed under die invention.
The assembly of the product under die present invention is identical to that of prior art except that die spacers used in the assembly are made of unequal thickness as described in die present invention.

Distinguished feature of the invented Product
The product under this invention is distinguished from prior art by the fact that the first two gaps from the bottom between the two pairs of consecutive blade edges as mounted on plastic base of the multiblade shaving head are of different measurement values.
The product under this invention is distinguished from prior art by the fact that the gap between the First blade edge which is the bottom edge and the Second blade edge above the First blade is not of the same measurement value as the gap between the Second blade edge from the bottom and the Third blade edge above the Second blade.
Prior Art
Shaving devices with multiple blades are well known in prior art These can be of 2, 3, 4, 5 or 6 blade systems. In prior art, the neighbouring blades on shaving heads with multiple shaving edges are always evenly spaced, i.e. the gap or the distance between any 2 consecutive blades on the shaving head in the device is the same. The blades are always spaced at equal distance from each other. A typical drawing of the configuration of a 5 blade system is given in Fig. 2.
No 7 is the first blade, No. 8 is the second blade, No. 9 is the third blade, No. 10 is the fourth blade, No. 11 is the fifth blade. No. 12 is the Z dimension on which the distance between the blades. The distances between the blades or gaps are as follows:
1. The First Gap between the first blade No. 7 and the second blade No. 8 measured in the Z dimension is 0.38mm
2. The Second Gap between the second blade No. 8 and the third blade No. 9 measured in the Z dimension is 0.38mm
3. The Third Gap between the third blade No. 9 and the fourth blade No. 10 measured in the Z dimension is 0.38mm
4. The Fourth Gap between the fourth blade No. 10 and the fifth blade No. 11 measured in the Z dimension is 0.38mm
As can be seen all the four gaps are equal.
In the above case, the gap between the First Blade and Second Blade is
the same as the gap between the Second Blade and Third Blade at
0.38mm.
In different products the actual gap distance may vary but it is
maintained at the same level from gap to gap on the same shaving head.

Innovation in the Invention:
1. A shaving device in the form of multiple shaving edges on the same side of the shaving head with unequal first and second gaps or distances separating the first two pairs of blades from bottom is new invention and not known in prior art
2. A shaving device in the form of multiple shaving edges on the same side of the shaving head which has a the first gap i.e. the gap between the first which is the bottom blade and the second blade just above it, is larger than the gap between the second blade and the third blade just above it is a new invention and not known in prior art
3. In another embodiment of the invention, the shaving device in the form of multiple shaving edges on the same side of the shaving head which has a the first gap i.e. the gap between the first or the bottom blade and the second blade just above it is smaller than the gap between the second blade and the third blade just above it is a new invention and not know in prior art
Example No. 1 Named as "Razor 1+2"
The first example of the embodiment of the invention is a 3 blade shaving head of the following description:
In the first example of the embodiment of the invention, the first blade is spaced further apart from the second as compared to the space between the second and third blade. The vertical gap between the first and the second blade is 38% more than the vertical gap between the second and third blade. This configuration is more particularly described in Fig, 3. The figure shows cross section of the shaving head, which has the height No. 16 of 5.3mm and width No. 17 of 16.8mm. No. 13 is the First blade mounted on the shaving head, No. 14 is the Second blade, and No. 15 is the Third blade. The gaps measured between the blades in the Z dimension are as follows: i). The First gap between the first blade No. 13 and the second blade No. 14 is 0.58mm.
ii). The Second gap between the second blade No. 14 and the third blade No. 15 is 0.42mm
Thus the First Gap is 38% larger than the Second Gap. The two gaps are unequal.
This is an example of a "Shaving Device with Multiple Unequally Spaced Blades" described in this invention.

Example No. 2: Named as "Razor 2+1"
The second example of the embodiment of the invention is a 3 blade shaving head of the following description:
In the second example of the embodiment of the invention, the first blade is spaced nearer to the second as compared to die space between the second and third blade. The vertical gap between the first and the second blade is 28% less than the vertical gap between the second and third blade. This configuration is more particularly described in Fig, 4. The figure shows cross section of the shaving head which has the height No. 23 of 5.3mm and width No. 24 of 16.8mm. No. 20 is the First blade mounted on the shaving head, No. 21 is the Second blade, and No. 22 is the Third blade. The gaps measured between the blades in the Z dimension are as follows: i). The First gap between the first blade No. 20 and the second blade No. 21 is 0.42mm.
ii). The Second gap between the second blade No. 21 and the third blade No. 22 is 0.58mm
Thus the First Gap is 28% smaller than the Second Gap. The two gaps are unequal.
This is another example of a "Shaving Device with Multiple Unequally Spaced Blades" described in this invention.
Example No. 3
The third example of the embodiment of the invention is a 4 blade
shaving head of the following description:
The configuration of the first 3 blades is as per Example No. 2 with the
addition of the 4th blade above the 3rd blade with following gaps:
Gap in Z Dimension between First and Second Blade - 0.42mm
Gap in Z Dimension between Second and Third Blade = 0.58mm
Gap in Z Dimension between Third and Fourth Blade = 0.38mm
Example No. 4
The fourth example of the embodiment of the invention is a 5 blade shaving head of die following description:
The configuration of the first 3 blades is as per Example No. 2 with the addition of the 4th blade and 5th blade above the 3rd blade as follows: Gap in Z Dimension between First and Second Blade - 0.42mm Gap in Z Dimension between Second and Third Blade = 0.58mm Gap in Z Dimension between Third and Fourth Blade = 0.38mm Gap in Z Dimension between Fourth and Fifth Blade = 0.38mm

Example No. 5
The fifth example of the embodiment of the invention is a 6 blade shaving head of the following description:
The configuration of the first 3 blades as per Example No. 2 with the addition of the 4th blade, 5th blade and the 6th blade above the 3rd blade with following gaps:
Gap in Z Dimension between First and Second Blade = 0.42mm Gap in Z Dimension between Second and Third Blade = 0.58mm Gap in Z Dimension between Third and Fourth Blade = 0.38mm Gap in Z Dimension between Fourth and Fifth Blade = 0.38mm Gap in Z Dimension between Fifth and Sixth Blade = 0.38mm

I claim:
1. A shaving device in the form of 3 shaving edges on the same side of the shaving head with unequal gaps which are the vertical distances separating the planes of any two neighbouring blades,
2. A shaving device described in Claim 1 wherein the gap between the first and second blade being at least 10% greater than the gap between the second and third blade.
3. A shaving device described in Claim 1 wherein the gap between the first and second blade being at least 10% smaller than the gap between the second and third blade.
4. A shaving device in the form of 4 shaving edges on the same side of the shaving head with unequal first and second gaps or distances separating the first two pairs of blades from the bottom.
5. A shaving device In the form of 5 shaving edges on the same side of the shaving head with unequal first and second gaps or distances separating die first two pairs of blades from the bottom.
6. A shaving device in the form of 6 shaving edges on the same side of the shaving head with unequal first and second gaps or distances separating the first two pairs of blades from the bottom.
7. A shaving device incorporating one or more shaving razor systems as described in any of the Claims 1 to 6 above and variants of such shaving devices made by persons well versed in
the art