FORM 2
THE PATENT ACT 1970
&
The Patents Rules, 2003
COMPLETE SPECIFICATION (See section 10 and rule 13)
1. TITLE OF THE INVENTION:
"An apparatus for embossing on tube face"
2. APPLICANT:
(a) NAME: Larsen & Toubro Limited
(b) NATIONALITY: Indian Company registered under the
provisions of the Companies Act-1956.
(c) ADDRESS: Larsen & Toubro Limited
L&T House, Ballard Estate, MUMBAI-400001,
Maharashtra State, INDIA
3. PREAMBLE TO THE DESCRIPTION:
COMPLETE
The following specification particularly describes the invention and the manner in which it is to be performed.

An apparatus for embossing on tube face Field of invention
The present invention relates to an apparatus for embossing a specific form on tube face from inside.
Background of prior art
At present embossing devices are available for embossing on a circular pipe but there has been no device for embossing on non circular tubes with precise tolerance on the embossed face developed up to now. Embossing using hydro forming was tried but no significant results were achieved.
Object of the invention
Object of the present invention is to provide an apparatus for embossing on face of non-circular tube from inside, which is capable of achieving desired geometric tolerances required on the embossed face.
Another object of the present invention is to provide an apparatus for embossing on tube face of non-circular tube from inside, which is easy to operate.
Yet another object of the present invention is to provide an apparatus for embossing on tube face of non-circular tube from inside, which is capable to provide embossing on non circular tubes from inside with precise tolerance.
The additional advantages and the features of the invention are described in the descriptions.

It is to be understood that the foregoing general description and detailed description with the figures are explanatory and intended to provide the explanation of the inventions as claimed.
Statement of the invention
According to the present invention there is provided an apparatus for embossing on tube face from inside, the apparatus comprising: a base plate;
a die assembly disposed over the base plate at a predefined portion, wherein the die assembly capable of holding the tube in a pre-defined alignment; a power source capable of supplying pressurized fluid through hydraulic hoses;
a punch assembly secured on the base plate axially aligned with the die assembly, the punch assembly comprises:
a linear track secured on the base plate;
a cantilever arm slidably secured on the linear track, the hydraulic punch actuator receives hydraulic fluid through hydraulic hose passing through the cantilever arm from the power source and supplies therethrough;
a hydraulic punch actuator connected to the cantilever arm; a first stopper and a second stopper secured over the linear track, the first stopper capable of restricting the tube at a predefined length from the die assembly, the second stopper capable of restricting the slide of the hydraulic punch actuator secured to the cantilever arm and on the linear track at a predefined distance; and
a plurality of punching means secured to the hydraulic punch actuator, the punching means capable of embossing on face of the tube from inside upon receiving hydraulic fluid from the power source through the hydraulic punch actuator.

Typically, wherein the hydraulic punch actuator mounted on cantilever arm which is secured to a mounting block having linear motion guides for slidably securing on the linear track.
Typically, wherein the power source is a manually actuated double acting hydraulic pump.
Typically, wherein the punching means comprising pistons and punches secured over the piston.
Typically, wherein the punch actuator mechanism comprises a first oil inlet for actuation of the punching means and plurality of second oil inlets for retraction of the punching means.
Typically, wherein the die assembly comprises:
a leveling plate secured over the base plate;
a die core disposed on the leveling plate for holding the tube therebetween, the die core having a first half and a second half attached thereto, wherein the first half is movable and the second half is rigidly secured to the leveling plate, the tube is held between the first half and the second half;
a die retracting mechanism having a hand wheel, the die retracting mechanism capable of moving the first half of the die core for holding and releasing the tube therebetween;
a die insert configured on the first half and second half of the die core, wherein the die insert are aligned to coincide the punch of the punch assembly; and
a resting block with a predefined height disposed over the leveling plate for aligning the tube held in the die core;
wherein the tube is held between the first half and the second half supported over the resting block, the punch assembly is aligned with the die assembly so as to align the axis of the tube and the punch at a predefined position,

so that the punch is aligned with the die insert, there after the power source is actuated to supply hydraulic fluid there through to actuate the punch thereby embossing on face of the tube from inside,
Typically, wherein the first half is secured to the leveling plate by ciamp plates.
Typically, wherein the first half and the second half of the die core is secured with each other by connecting studs and nuts.
Brief description of the Invention
The accompanying drawings are included to provide proper understanding of the invention and the description thereof serve to explain the principle of the invention:
FIG. 1 illustrates an isometric view of an apparatus for embossing on noncircular tube from inside in accordance with the present invention;
FIG. 2 illustrates an enlarged view of a die assembly of fig. 1;
FIG. 3 illustrates an enlarged view of punch assembly of fig. 1;
FIG. 4 illustrates a sectional view of the hydraulic punch actuator of fig. 3, and
FIG. 5 illustrates a cross-sectional view of tube in accordance with the present invention.

Description of the invention
The foregoing objects of the present invention are accomplished and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiment.
The present invention provides an apparatus for embossing on face of a non-- circular tube from inside. The apparatus is useful for doing embossing on non circular tubes having larger thickness and embossing location at farther distance toward the centre of the tube length having space constraint for inserting embossing mechanism. The apparatus is includes a base plate, a linear track, a punching means, a core, a cantilever arm, and resting blocks. Indexing of the tube is manual in present case but it can be mechanized through indexing heads.
The present invention is now illustrated with reference to the accompanying drawings, throughout which reference numbers indicate corresponding parts in the various figures. These reference numbers are shown in bracket in the following description.
Referring now to Fig. 1 illustrates an isometric view of an apparatus (100) for embossing on tube face from inside in accordance with the present invention. For the purpose of explanation of the present invention the apparatus (100) used for embossing on face of non-circular tube (60) from inside is elaborated. The apparatus (100) includes a base plate (10), a die assembly (20), a punch assembly (40), a tube (60) and a power source (70). The die assembly (20), the punch assembly (40). and the tube (60) are disposed over the base plate (10). The die assembly (20) is capable of holding the tube (60) and the embossing is done by punch assembly (40).

Referring now to fig. 2 shows an enlarged view of a die assembly (20) of the present invention. The die assembly (20) includes a die core (22), a die insert (24), a die retraction mechanism (26), a hand wheel (28), a resting block (30), a leveling plate (32), clamp plates (34a and 34b) and connecting studs (36a) and nuts (36b). The die core (22) and the resting block (30) are disposed over the leveling plate (32). The leveling plate (32) is secured over the base plate (10) with proper alignment thereon. The die core (22) includes two halves first halve (22a) and second halve (22b). The die insert (24) is configured on each of the halves (22a & 22b). The first baif (22a) is secured to the base plate (10) by means of the clamp plates (34a and 34b) thereon. The first half (22a) is retractably secured with the second half (22b) of the die core (22) by means of the connecting studs (36a) and nuts (36b). The connecting studs (36a) and the nuts (36b) bare the axial load produced during embossing.
Referring now to figures 3 & 4, shows various views of punch assembly (40) of the present invention. Further, the punch assembly (40) includes a hydraulic punch actuator (42), a plurality of punching means, the present invention is shown to include two punching means,, a linear track (46), cantilever arm (48) with a linear motion guides (50a & 50b), a mounting block (52), a first stoppers (54a) & a second stopper (54b) and a power source (70). The punching means includes two punches (44) mounted on two pistons (44a).
The hydraulic punch actuator (42) includes two punches (44) for embossing. The hydraulic punch actuator (42) is secured at the free end portion of the cantilever arm (48). The cantilever arm (48) is secured at the other end to the mounting block (52). The cantilever arm (48) provides passage for hydraulic oil lines (hoses) from the power source (70) to the hydraulic punch actuator (42) The mounting block (52) is secured over the linear motion guides (50a & 50b) and then slidebly secured over a linear track (46) for sliding thereon. Further, the first stopper (54a) and the second stopper (54b) are secured over the linear track (46) to ensure the pattern of embossing distance from an end of the tube (60). The

punches (44) and the die assembly (20) are aligned with each other to maintain a proper alignment of the tube (60) thereon.
Further, the tube (60) is inserted between the first halve (22a) and second halve (22b) of the die core (22) secured by operating the hand wheel (28) to operate the die retraction mechanism (26), and the tube (60) is rested over the resting block (30) and restrained by the first stoppers (54a). The first stopper (54a) restricts the movement of the tube (60) at a predefined distance from the die assembly (20). The second stopper (54b) is provided to restrain the movement of the mounting block (52). Further, additional supports may be provided on the base plate (10) for maintaining the alignment of the tube (60) thereon. The first stoppers (54a) and the second stopper (54b) are provided at a predefined distance from the die core (22). The resting block (30) is configured to have a predefined height to ensure location of embossing profile on the tube (60).
Thereafter, the punches (44) of the punch assembly (40) are aligned to coincide with the die insert (24). The hydraulic force is applied by operating the power source (70) which enables pistons (44a) of the punch actuator (42) to move thereby moving the punches (44) upon receiving hydraulic fluid in a first oil inlet (56), thereby activating the punches (44) for embossing on the tube (60). Further, plurality of second oil inlets (58), the present invention is shown to include two second oil inlets (58) are provided for retracting the two punches (44). Furthermore, the hydraulic fluid is supplied through the second oil inlets (58) for retracting the actuated punch (44) after embossing on the tube (60) from inside. In an embodiment, the power source (70) is a manually operated double acting hydraulic pump. In another embodiment, the power source (70) is connected to the punch assembly (40) through hoses pipe (72). Further, the connecting studs (36a) and the nuts (36b) is loosed to release the tube (60) held in the die core (22) for removing the tube (60) therefrom. Moreover, the above mentioned process is repeated for embossing on the other side of the tube (60) (refer FIG. 5).

Advantages of the present invention of an apparatus (100) are:
1. The apparatus (100) is capable of achieving desired geometric tolerances required on the embossed face.
2. The apparatus (100) is easy to operate.
3. The apparatus (100) is capable to provide embossing on non circular tubes with precise tolerance.
Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure, or matter.
The embodiments of the invention as described above and the methods disclosed herein will suggest further modification and alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the spirit and scope of the invention; which is defined by the scope of the following description.

We Claim:
1. An apparatus for embossing on tube face from inside, the apparatus comprising:
a base plate;
a die assembly disposed over the base plate at a predefined portion, wherein the die assembly capable of holding the tube in a pre-defined alignment;
a power source capable of supplying pressurized fluid through hydraulic hoses:
a punch assembly secured on the base plate axially aligned with the die assembly, the punch assembly comprises:
a linear track secured on the base plate;
a cantilever arm slidably secured on the linear track, the hydraulic punch actuator receives hydraulic fluid through hydraulic hose passing through the cantilever arm from the power source and supplies therethrough;
a hydraulic punch actuator connected to the cantilever arm; a first stopper and a second stopper secured over the linear track, the first stopper capable of restricting the tube at a predefined length from the die assembly, the second stopper capable of restricting the slide of the hydraulic punch actuator secured to the cantilever arm and on the linear track at a predefined distance; and
a plurality of punching means secured to the hydraulic punch actuator, the punching means capable of embossing on the face of the tube from inside upon receiving hydraulic fluid from the power source through the hydraulic punch actuator.
2. The apparatus as claimed in claim 1, wherein the hydraulic punch actuator mounted on cantilever arm which is secured to a mounting block having linear motion guides for slidably securing on the linear track.

3. The apparatus as claimed in claim I, wherein the power source is a manually actuated double acting hydraulic pump.
4. The apparatus as claimed in claim 1, wherein the punching means comprising pistons and punches secured over the piston.
5. The apparatus as claimed in claim 1, wherein the punch actuator mechanism comprises a first oil inlet for actuation of the punching means and plurality of second oil inlets for retraction of the punching means,
6. The apparatus as claimed in claim I, wherein the die assembly comprises:
a leveling plate secured over the base plate;
a die core disposed on the leveling plate for holding the tube therebetween, the die core having a first half and a second half attached thereto, wherein the first half is movable and the second half is rigidly secured to the leveling plate, the tube is held between the first half and second half;
a die retracting mechanism having a hand wheel, the die retracting mechanism capable of moving the first half of the die core for holding and releasing the tube therebetween;
a die insert configured on the first half and second half of the die core, wherein the die insert are aligned to coincide the punch of the punch assembly; and
a resting block with a predefined height disposed over the leveling plate for aligning the tube held in the die core;
wherein the tube is held between the first half and the second half supported over the resting block, the punch assembly is aligned with the die assembly so as to align the axis of the tube and the punch at a predefined position, so that the punch is aligned with the die insert, there after the power source is actuated to supply hydraulic fluid there through to actuate the punch thereby embossing on face of the tube.

7. The apparatus as claimed in claim 5, wherein the first half is secured to the leveling plate by clamp plates.
8. The apparatus as claimed in claim 5, wherein the first half and the second half of the die core is secured with each other by connecting studs and nuts.
9. An apparatus for embossing on tube face from inside substantially as described in the description with reference to the accompanying diagram.