Title of Invention

" A TAMPER PROOF SEAL FOR A LPG CYLINDER VALVE"

Abstract The instant invention relates to a tamper proof seal for a IPG cylinder valves having a safety cap comprising a hollow cylindrical body having one end open and the other end with a small concentric hole, a first locking ting at the open end of the said hollow cylindrical body to lock with the threads on said LPG valve, a second locking ring is provided below the said other end at a distance necessary to lock with lower surface of the rim of the safety cap, two weakening links along the length of the hollow cylindrical body to tear open said seal and an external tapered protrusion between said weakening links to bifurcate a thread on said safety cap to facilitate tearing along said weakening links, when said thread is pulled.
Full Text The present invention relates to a tamper proof seal for a LPG cylinder valve.
Background:
Liquefied Petroleum Gas (LPG) is commonly used for cooking purposes. Such gas is available in LPG cylinders from a private or public sector. The cylinder contains the liquefied petroleum gas at a required pressure and is closed with a cylinder valve with a safety cap. The safety cap has a lock wire and a nylon thread attached to the lock wire. The safety cap is opened by pulling the thread. The cylinder valve is then connected to a pressure regulator, which in turn is coimected to the cooking range. Conventionally, to make the cylinder tamper proof a metal cap is crimped over the safety cap and the cylinder valve. It is not difficult to tamper the conventional crimped metal cap to adulterate or remove some of the gas and reseal said metal crimp on the cylinder valve and thereby cheat the consumer. Furthermore, it effects the reputation of the private or public sector distributing the LPG cylinders
Objects of the Invention:
The object of this invention is to obviate the above drawback and provide a tamper proof seal for a LPG cylinder valve.
Further object of the invention is to provide a tamper proof seal for a LPG cylinder valves that breaks or visibly deforms on tampering and can not be reused.
It is further object of the invention to provide a tamper proof seal for cylinder valves that is economical and easy to manufacture.
To achieve the said objectives, the present invention provides a tamper proof seal for a LPG cylinder valves having a safety cap comprising.
- a hollow cylindrical body having one end open and the other end with a small concentric hole;
- a first locking ring at the open end of said hollow cylindrical body to lock with the threads on said LPG cylinder valve;
- a second locking ring is provided below the said other end at a distance sufficient to lock with lower surface of the rim of the safety cap;
- two weakning links along the length of the hollow cylindrical body to tear open said seal;
- an external tapered protrusion between said weakening links to bifurcate a thread on said safety cap to facilitate tearing along said weakening links, when said thread is pulled.
The said seal is made of plastic.
The said first locking ring is tapered so that it can lock with the thread on the outer surface of the cylinder valve.
The said second locking ring is also tapered but its tapering is smaller than the first locking ring.
The inner diameter of said first locking ring is smaller than that of said second locking ring.
The inner diameter of said second locking ring is such that it locks with a lower surface of a rim on said safety cap.
The said first and the second locking rings consists of two semi-circular rings around the weakening links and are diametrically opposite.
Brief Description of the Accompanying Drawings:
Th invention will now be described with reference to the accompanying drawings.
Figure 1 shows the conventional LPG cylinder with a cylinder valve and a safety cap.
Figure 2 shows the tamper proof seal for a cylinder valve in accordance with the present invention.
Figure 3 shows the tamper proof seal mounted on the cylinder valve.
Figure 4 shows the tear of the seal.
Detaiied description:
Figure 1 shows a Conventional LPG cylinder for storing liquefied petroleum gas under pressure.
The cylinder body (1) of said cylinder is closed with a cylinder valve (2) and a safety cap (3). The said safety cap (3) is provided onto the cylinder valve (2) by means of a lock wire (4). A nylon thread (5) is connected to said lock wire (4). On pulling the nylon thread (5) the lock wire (4) is released and the safety cap (3) can be removed from the cylinder valve (2). As can be seen from the figure 1 the cylinder valve (2) has threads (6) on the outer surface. A pressure regulator (not shown) is fitted onto the cylinder valve (2) to release the LPG from the cylinder body (1) to the cooking range (not shown).
Figure 2 shows the temper proof seal consisting of a hollow cylindrical body (7) having one end (8) open and the other end (9) with a small concentric hole (10). The open and (8) of the seal has a first locking ring (11) provided on the inner surface of the hollow cylindrical body (7). The first locking ring (11) is tapered so that it can lock with the threads (6) on the outer surface of the cylinder valve (2). Further, the taper on the lower surface of the first lock ring facilitates easy sliding of the seal onto the cylinder valve (2) and also resists any attempt to remove the seal once locked with said threads (6) of the valve (2).
A second locking ring (12) is provided below the said other end (9) at a distance necessary to lock with the lower surface of the rim of the safety cap (3). The said second locking ring (12) is also tapered so as to resist any attempt to remove the seal once locked with the cylinder valve (2). The tapering of said second locking ring (12) is smaller than the tapering of first locking ring (11). The inner diameter of the first locking ring (11) is smaller as compared to the second locking ring (12).
The cylindrical hollow body (7) of the seal is provided with two weakening links (13) along its length. The seal is fitted over the cylinder valve (2) in a manner such that the nylon threads (5) on the safety cap (3) comes out in the region of the weakened links (13). To remove the seal, the nylon threads (5) are pulled which results in the seal tearing along the weakened links (13), as shown in figure 4. To facilitate the tearing of the seal along the weakened links (13) a outwardly tapered protrusion (14) is provided on to hollow cylindrical body (7) at the open end (8). The protrusion (14) helps in bifurcating the nylon threads (5) and ensures that the threads (5) tear along the weakened links (13).
The seal is manufactured with very close tolerances such that the seal is tightly locked against the cylinder valve (2). In order to mount the seal, the seal must first be heated to expand, thus allowing it to slide over the cylinder valve (2). On cooling, the seal snugly fits over the cylinder valve (2). The material chosen for the seal is such that any attempt to reheat the seal in order to tamper with the cylinder will result in the deformation of the seal. Preferably the seal may be made of plastic. Thus the seal once fitted can only be removed if broken, thereby making it easy to detect any tampering of the cylinder.






We claim:
J. A tamper proof seal for a LPG cylinder valves having a safety cap comprising:
- a hollow cylindrical body having one end open and the other end with a small concentric hole;
- a first locking ring at the open end of said hollow cylindrical body to lock with the threads on said LPG cylinder valve:
- a second locking ring is provided below the said other end at a distance necessary to lock with lower surface of the rim of the safety cap;
- two weakening links along the length of the hollow cylindrical body to tear open said seal;
- an external tapered protrusion between said weakening links to bifurcate a thread on said safety cap to facilitate tearing along said weakening links, when said thread is pulled.

2. A tamper proof seal as claimed in claim 1 wherein said seal is made of plastic.
3. A tamper proof seal as claimed in claim I wherein said first locking ring is tapered so that it can lock with the thread on the outer surface of the cylinder valve.
4. A tamper proof seal as claimed in claim 1 wherein said second locking ring is also tapered but its tapering is smaller than the first locking ring.
5. A tamper proof seal as claimed in claim 1 wherein the inner diameter of said first locking ring is smaller than that of said second locking ring.
6. A tamper proof seal as claimed m claim 1 wherein inner diameter of said second locking ring is such that it locks with a lower surface of a rim on said safety cap.
7. A tamper proof seal as claimed in claim 1 wherein said first and the second locking rings consists of two semi-circular rings around the weakening links and are diametrically opposite
8. A tamper proof seal for a LPG cylinder valves having a safety cap substantially as herein described with reference to and as illustrated in the accompanying drawings.

Documents:

1010-del-2004-abstract.pdf

1010-del-2004-claims.pdf

1010-del-2004-complete specification(granted).pdf

1010-DEL-2004-Correspondence Others-(17-05-2012).pdf

1010-del-2004-correspondence-others.pdf

1010-del-2004-correspondence-po.pdf

1010-del-2004-description (complete).pdf

1010-del-2004-drawings.pdf

1010-del-2004-form-1.pdf

1010-del-2004-form-19.pdf

1010-del-2004-form-2.pdf

1010-DEL-2004-Form-27-(17-05-2012).pdf

1010-del-2004-form-3.pdf

1010-del-2004-gpa.pdf

1010-del-2004-pa.pdf

1010-DEL-2004-Petition-137-(17-05-2012).pdf


Patent Number 244036
Indian Patent Application Number 1010/DEL/2004
PG Journal Number 47/2010
Publication Date 19-Nov-2010
Grant Date 15-Nov-2010
Date of Filing 02-Jun-2004
Name of Patentee ENERGY INFRASTRUCTURE (INDIA) LIMITED
Applicant Address NO. 5, E-BLOCK,LOCAL SHOPPING CENTRE, MASJID MOTH, GREATER KAILASH-II, NEW DELHI-110048, INDIA
Inventors:
# Inventor's Name Inventor's Address
1 RAJESH RAO ENERGY INFRASTRUCTURE (INDIA) LIMITED, NO. 5, E-BLOCK, LOCAL SHOPPING CENTRE, MASJID MOTH, GREATER KAILASH-II, NEW DELHI- 110048, INDIA
PCT International Classification Number F16K 1/00
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 NA