FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
Complete Specification
Secification
[See Section 10 and rule 13]

1 Title of the Invention.
"Double compression cable gland with novel construction especially designed for un-armored and/or flexible cables"
2 Applicant (s)
1 Applicant SIGMA INDUSTRIES
Nationality India
Address SPECIAL SHED No. 15/2/A, G.I.D.C. - I, SHANKER TEKRI, JAMNAGAR - 361004, INDIA
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF THE INVENTION
The present invention relates to indoor and outdoor cable glands especially constructed for un-armored cables with the novel design, where dual environmental seal of identical diameter that complimentarily matches with the diameter of the outer sheath of un-armored cables providing an accurate and reliable cable termination with the enhanced durability and efficient protection to the electrical wiring system against weather, strain, twist and vibration, with the flexibility to be removed whenever required.
BACKGROUND OF THE INVENTION
There are numerous different designs of cable glands known for the cable termination into a piece of housing equipment such as a switch cabinet, a junction box or the like, serving as protection against weather, dust and moisture, strain, twist and vibration while practical operation. Cable glands with the provision of single compression and double compression for the use with two types of cables, un-armored and armored cables respectively, are available in the market.
Single compression cable gland considered as single compression due to embodiment of single seal compressed to cable for the gripping by the cable gland. This type of cable glands are generally used for the termination of the un-armored cables. Double compression cable gland, generally being used for armored cable, embody the outer seal and the inner seal, the outer seal being adapted to seal onto the outer sheath of an armored cable, in use, and the inner seal being adapted to seal onto the inner sheath. An armor clamp assembly is provided between the two seals to clamp the armor wires of an armored electrical cable.
However, now-a-days use of conventionally available double compression cable glands for the un-armored cables is also being very popular in particular with companies with substantial projects insists the use of double compression cable glands even for the un-armored cables. Although, the cable gland having double * seal arrangement with difference in the diameter of the outer seal and the inner seal, that does not compliment accurately with the sheath of the un-armored cables, further the

outer seal comprises very thick wall that is unable to even squeeze/compress properly in order to hold an un-armored cable, resulting in the inappropriate and weak gripping of the cable that has not proved to be satisfactorily effective.
Moreover, prior available double compression cable glands comprises an armor clamp assembly including clamping ring and armor cone provided between the two seals to clamp the exposed braiding of an armored cable, that are not required in the case of an un-armored cables and therefore being unnecessarily included in to the cable gland assembly with the un-armored cable, being undesirably expensive when used for the major projects.
Hence, a need continues to exist for an improved cable gland for assembling a restrained cable termination with double compression for an un-armored cable that can withstand transitory shocks and other comprehensive forces which may be encountered while in the practical use and provide the protection against the ambient factors such as dust and moisture.
Therefore the present invention is proposed to solve the above mentioned problems in an economic, environment and user friendly manner and at the same time to provide a cable gland with novel design in order to provide an efficient cable gland assembly with an un-armored cable for the farseeing durability.
OBJECT OF THE INVENTION
The major object of the present invention relates to provide a cable gland that can be used with un-armored cables with the novel sealing arrangement comprising outer seal and inner seal of the equal diameter that complementarily matches the diameter of the sheath of the un armored cables providing an accurate gripping of the cable at dual position fulfilling the purpose of the double compression, resulting in the most efficient and reliable cable termination which can withstand against weather, dust and moisture, strain, twist and vibration while practical operation.

In a preferred aspect, the invention presents the novel construct of the cable gland eliminating the requirement of the clamping ring with armor cone that are used for the mechanical clamping of armored cables thus not required for the case of present invention, that is specifically constructed to be used with the un-armored cables hence providing more simply manufactured, easily installable light weight cable gland with relatively few separate parts providing more satisfactory effect in user friendly and cost effective manner.
In further preferred aspect, the invention presents double compression cable gland with novel design construction for the E.T., NPT and METRIC thread fitting, the cable gland enclosure provides protection against the ingress of dirt and water under the standard specification of IP66 and IP67 along with the gland size varying from 10mm to 100mm depending upon the requirement.
BREIF DESCRIPTION OF THE DRAWINGS
The invention will hereinafter be described by way of preferred exemplary
embodiments with reference to the drawings, where
j Fig. 1 is a schematic structural view, of the longitudinal and transverse cross sections of the cable gland according to the preferred embodiment of the present invention, wherein the component parts are as followed
1. Compression Nut,
2. Outer Seal-1 with annular rift on outer surface,
3. Gland Nut,
4. Gland Body,
5. Outer seal-2 with annular rift on outer surface,
6. Flat Washer,
7. Lock Nut;
Fig. 2 is a perspective view, of the cable gland component parts, in accordance with the Fig. 1 of the present invention.

Fig. 3 is a schematic structural view, of the longitudinal and transverse cross sections of the cable gland according to the preferred embodiment of the present invention, wherein the component parts are as followed
1. Compression Nut,
2. Outer Seal-1 with smooth outer surface,
3. Gland Nut,
4. Gland Body,
5. Outer seal-2 with smooth outer surface,
6. Flat Washer,
7. Lock Nut;
Fig. 4 is a perspective view, of the cable gland component parts, in accordance with the Fig. 3 of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Advantages and features of the claimed invention will be apparent from the following detailed description to be read in conjugation with the accompanying drawings. A double compression cable gland build up with a unique design for the highly reliable termination of un-armored cables secured with the removable dual seal lock system according to preferred embodiment of the present invention is described herein after. In describing the present invention any related known function or structures are not described in detail so as to not vague the gist of the present invention.
In the preferred embodiment of the present invention, double compression cable gland specifically constructed with the novel design in particular with the un-armored cable comprising dual seal arrangement wherein the diameter of two outer seals are identical to each other that are complimentarily matching with the outer diameter of the sheath of the un-armored cable consequently providing the accurate gripping of the cable at dual positions on the cable correspondingly the position of the seals within the cable gland, undeniably fulfilling the purpose of the double compression, establishing the

most efficient and reliable cable termination that is stronger enough to withstand with transitory shocks and other comprehensive forces as well as prevents the ingress ion of dust and moisture within the cable gland which may be encountered while operation.
In further preferred aspect, the present invention demonstrates a unique design of cable gland with the limited numbers of separate parts by eliminating the requirement of the clamping ring and armor cone that are being used as clamping assembly to aid mechanical clamping of an exposed braiding of an armored cable being undesirable for the preferred use with an un-armored cable of the present invention. The said elimination of undesired parts will indulge simplified manufacturing of a cable gland with enhanced efficacy for the dual compression gripping of an un-armored cable than the prior known knowledge along with the advantages like light in weight, less expensive, and easy to install thus user friendly.
Fig. 1 and Fig. 3 illustrates a schematic structural view of the longitudinal and transverse cross sections of the double compression cable gland for an un-armored cable according to preferred embodiment of the present invention wherein the gland comprising mainly three separate component parts:
a compression nut (1), is incorporated with a sealing member that is the outer seal-I (2) at the internal unthreaded portion and a threaded end for engagement with the gland nut (3);
a gland nut (3) having threads at both the ends for interengagement with said compression nut (1) and gland body (4); and
a gland body (4) that can also be referred as main body is incorporated with another sealing member that is the outer seal-II (5) at the internal unthreaded portion and having threads on coupling end and a nut engaging end, a fiat washer (6) externally arranged on the threaded coupling end and a lock nut screwed on the threaded coupling end.
With this arrangement, due to elimination of undesired armored clamping parts and incorporation of sealing members, outer seal-I (2) and outer seal-II (5), into the compression nut (1) and gland body (4) respectively, the cable gland is easier to install

as there are reduced number of separate parts for assembly on cable. Further, in this arrangement in accordance with the Fig. 1 the compression nut (1) and gland body (4) fits with the respective seals without leaving any space around the sealing members, wherein outer seal-I and outer seal-II comprises the annular rift on the outer surface as a provision of compression space while compression by compression nut (1) and gland body (4). Whereas in accordance with the Fig. 3, the compression nut (1) and gland body (4) fits with the respective seals leaving an inclined space in between in order to provide an inclined compression of the sealing members comprising the uniformly smooth outer surface, while compression by compression nut (1) and gland body (4).
Alternatively, to make the said installation of cable gland with the un-armored cable, the cable has to be passed through the loosened cable gland components. Tightening of the compression nut (1) by screwing it up on the gland nut (3) will result in the compression of the outer seal-I (2) thereby aiding in gripping of the cable at that particular position. Likewise, tightening of gland body (4), compresses the outer seal-II (5) to grip the cable at that particular position thereby fulfilling the purpose of the double compression at dual position on cable, for the most efficient and reliable cable termination. The said gland body (4) implements cable termination either by means of lock nut (7) and/or flat washer (6) or directly by interengagement of threaded coupling end with the female threaded end/plain holes of the electrical box housing.
Fig. 2 and Fig. 4 illustrates a perspective view of the cable gland components, in accordance with the present invention wherein compression nut (1) preferably comprises an internal unthreaded portion and an internal threaded portion for engagement with the gland nut (3). The internal unthreaded portion preferably incorporated with the cylindrical hollow sealing member outer seal-I (2). Further, the gland nut (3) most preferably has threads at both the ends serving interengagement with the compression nut (1) and gland body (4). Furthermore, gland body (4) preferably comprises an internal unthreaded portion preferably for the incorporation of the outer seal-II (5) and an internal and external threaded portion at nut engaging end and coupling end respectively.

In further preferred aspect, the seal material being used here is preferably neoprene rubber and sealing members are made with the standardized thickness being able to be compressed apparently with the tightening of the compression nut and gland body providing an appropriate and appreciable gripping of the cable. Most preferably gland material can be brass, stainless steel, mild steel, and aluminum with the preferable plating options of Nickel, Chrome, Tin, and Zinc. The preferred cable gland can be used with the operating temperature range -30°C to +190°C with or without the supporting accessories such as Shroud, Earth tag, Blank plugs, Adaptor/Reducer, and Entry thread seal.
In further preferred aspect, the invention presents double compression cable gland with novel design construction for the E.T., NPT and METRIC thread fitting. Further, the preferred cable gland according to Fig. 1 and 2 serves as protection against the ingress of dirt and water as preferred to follow the standard specification of IP66 and the preferred cable gland according to Fig. 3 and 4 serves as protection against the ingress of dirt and water as preferred to follow the standard specification of IP67 accurately. Furthermore, the range for the gland size may vary accordingly from 10 mm to 100mm or even customized to all possible sizes of un-armored/flexible cables depending upon the requirement thereof.
The said invention is purposed to provide a double compression cable gland for an un-armored cables with dual environmental seal and reduced number of separate parts to be assembled with the cable and housing, thereby providing a cable gland with lesser weight and expense, easy installation, for the most efficient and reliable cable termination. Although the subject matter has been described with reference to certain preferred embodiments thereof, other embodiments are possible. As such, the spirit and scope of the subject matter described herein should not be limited to the description of the embodiment contained herein.

We Claim:
1. A double compression cable gland particularly constructed for un-armored cables
with dual environmental seal arrangement and reduced number of separate parts to
be assembled with the cable in order to provide a highly reliable cable termination
in an economic and user friendly manner wherein the cable gland comprising
majody three separate components:
- a compression nut (1) is incorporated with a sealing member that is the outer seal-I (2) at the internal unthreaded Portion and a threaded end for engagement with the gland nut (3);
- a gland nut (3) having threads at both the ends for interengagement with said compression nut (1) and gland body (4); and
- a gland body (4) is incorporated with another sealing member that is the outer seal-II (5) at the internal unthreaded portion and having threads on coupling end and a nut engaging end, a flat washer (6) externally arranged on the threaded coupling end and a lock nut screwed on the threaded coupling end.

2. The cable gland as claimed in claim 1, characterized, in that the said outer seal-I (2) and outer seal-II (5) incorporated in the compression nut (1) and the gland body (4) respectively are of identical diameter, complimentarily matching with the outer diameter of the sheath of the un-armored cables, consequently providing the accurate gripping of the cable at dual positions on the cable, corresponding to the position of the seals within the cable gland.
3. The cable gland as claimed in claim 1 and 2, characterized in that the said cable gland providing accurate gripping of the cable with simple mechanism of tightening the compression nut (1) compressing the outer seal-I (2) on the cable, likewise tightening the gland body (4) compressing the outer seal-II (5) on cable, thereby holding the cable at dual position, fulfilling the purpose of the double compression, establishing the highly reliable cable termination that are manufactured under the protection class IP66 and IP67.

4. The cable gland components as claimed in claim 1, wherein said cable gland components with all practically possible sizes and shapes may be configured to be used for termination of any un-armored and/or flexible cables, required for the cable termination in industrial as well as hazardous segments thereof.