SEAL WITH A BLOCKABLE ROTOR FOR MEASURING INSTRUMENTS

Abstract

The invention relates to means for sealing measuring instruments and equipment, specifically to seals with a blockable rotor to enable monitoring for unauthorized access to instruments measuring consumption of electrical and heating energy, natural gas and water. A seal with a rotor comprises a transparent body (1) made from a high-strength plastic and formed with a cylindrical cavity (2) having a blind end and openings (3) which are formed on lateral sides of the cavity (2) and through which a flexible sealing element passes, and a rectangular cavity (4) which is installed at the open end of the cavity (2), transversely with respect to the latter, wherein the cavities (2) and (4) are interconnected. A rotor (6) is arranged in the cavity (2) so as to be rotatable in one direction. Openings for the flexible sealing element are formed in the lateral walls of the cavity (2) and in the rotor. A cross-shaped blocking element (9) is installed at one end of the rotor. A device (5) for blocking the rotation of the rotor is arranged in the cavity (4), one end of which device is provided with two projections in the form of a fork (13), between which a trapezoidal groove (15) is formed for securing the cross-shaped blocking element (9).

Claims

1. The seal with a blockable rotor for measuring instruments comprises a transparent body 1 made from a high-strength plastic and formed with a cylindrical cavity 2 having a blind end and openings 3, which are formed on lateral sides of the cavity 2, and through which a flexible sealing element passes, and a rectangular cavity 4, which is installed at the open end of the cavity 2, transversely with respect to the latter, wherein the cavities 2 and 4 are interconnected. Cavity 4 contains a device 5 to block the rotation of the rotor 6 while the cylindrical cavity 2 houses the rotor 6 with the openings 7, coaxial with openings 3 located on the lateral sides of the cylindrical cavity 2. The rotor 6 is arranged inside the cylindrical cavity 2 so as to be rotatable in one direction with the help of flexible ratchet locks 8 made on it, contacting with the longitudinal ribs made on the inner side of the cavity 2, in the lateral walls of which and in the rotor (6) coaxial openings (3) and (7) for the flexible sealing element are made; the rotor (6) is divided by a partition (10) into two cavities for winding a flexible sealing element on it. On one end of the rotor (6) a blocking cross-shaped element (9) is mounted while on the front outer wall of the rotor (6) a handle (11) is installed. The rectangular cavity (4) houses a blocking device (5) for the rotor (6) rotation, one end of which two fork-shaped projections (13) are available between which a trapezoidal groove (15) is made to fix the blocking cross-shaped element (9). At the same time, the flexible ratchet locks (16) are made on the lateral walls of the blocking device (5) and rigid ribs (17) are made on the inner front walls of the element in the form of a rectangular parallelepiped (4).

2. A seal with a lockable rotor, according to the formula of invention 1, where a rectangular cavity is made on the outer side of the blocking device (5) for applying the reference data on the seal.

3. The seal with a lockable rotor, according to the formula of invention 1, for the purpose of automating the assembly, is made in blocks of five pieces connected by jumper bars.

4. The seal with a lockable rotor, according to the formula of invention 1, where the blocking device (5) is made with an option of installation in the cavity (4) in two positions: 1pre-installation; 2final installation and blocking of the rotor.

Description

[0011] The essence of the claimed technical solution is explained by the description of the drawings (FIGS. 1-3) as follows:

[0012] FIG. 1, in section view of the seal with the assembled rotor blocking device;

[0013] FIG. 2, side view, section B-B;

[0014] FIG. 3, view, section A-A.

[0015] The seal with a blockable rotor for measuring instruments comprises a transparent body 1 made from a high-strength plastic formed with a cylindrical cavity 2 having a blind end and openings 3, which are formed on lateral sides of the cavity 2, through which a flexible sealing element passes, and a rectangular cavity 4, which is installed at the open end of the cavity 2, transversely with respect to the latter, wherein the cavities 2 and 4 are interconnected. Cavity 4 contains a device 5 to block the rotation of the rotor 6 while the cylindrical cavity 2 houses the rotor 6 with the openings 7, coaxial with the openings 3 located on the lateral sides of the cylindrical cavity 2. Rotor 6 is arranged in the cylindrical cavity (2) so as to be rotatable in one direction with the help of flexible ratchet locks 8 made on it, contacting with longitudinal ribs made on the inner side of the cavity 2. Rotor 6 is equipped with a blocking cross-shaped element 9, which provides blocking of the rotor rotation during the sealing. Partition 10 divides the rotor 6 into two concentric cavities for winding a flexible sealing element on it. On the front outer side of the rotor 6, a handle 11 is installed made in the form of two separate blades with the possibility of their separation from the rotor by breaking off in the point of thinning 12. The lower side of the blocking device 5 is equipped with two fork-shaped projections 13. A trapezoidal groove 15 is made in the cavity 14 between the projections 13, contacting the blocking cross-shaped element 9 when the rotor 6 is locked. The flexible ratchet locks 16 are installed on the sides of the locking device 5, contacting with rigid ribs 17 made on the inner sides of the cavity 4. A rectangular cavity 18 is made on the outer side of the blocking device 5 to apply a bar code containing information about the seal with the option to automatically read the information.

[0016] The device 5 for blocking the rotation of the rotor 6 is designed so that it can be installed in two stages: 1pre-installation, allowing the rotation of the rotor and winding of the flexible sealing element (cable); 2final installation and blocking of the rotor 6. The inability to remove the rotor 6 from the cavity 2 is achieved by equipping the inner side of the blocking device 5 with two fork-shaped projections allowing, after sealing, to block the rotor 6 on both sides, preventing its rotation and axial movement.

[0017] The blocking device 5 and the body 1 of the seal are made of plastic, resistant to external influences and mechanical forces, with the blocks of five pieces connected by jumper bars, thereby providing the opportunity to automate the assembly, leading to a decrease of both the assembly time and the cost of the seal.

[0018] Flexible sealing element can be made of steel cable, polymer fiber optic cable or webbed copper cable.

[0019] Method of assembly of the seal with the blockable rotor for measuring instruments.

[0020] In the cavity 2 of the body 1, made by casting method from a transparent plastic, the rotor 6 is installed, after which the blocking device 5 is inserted into the rectangular cavity 4 in such a way as to allow ratchet locks 16 on its sides to contact with the rigid ribs 17 on the inner sides of the cavity 4, with the condition that the cavity 14 with the trapezoidal groove 15 does not interlock with the locking cross-shaped element 9 on the rotor 6, ensuring its free rotation. After that, the free end of the flexible sealing element is inserted into one of the openings 3, made on the lateral walls of the cavity 2, pre-arranged coaxial with the openings 7 of the rotor 6. Then, with the help of the handle 11, one or two clockwise rotations are made fixing the flexible sealing element on the rotor 6. Availability of the ratchet locks 8 on the rotor 6 interacting with the longitudinal ribs on the inner surface of the cavity 2 ensures the rotation of the handle 11 only in one direction while the end of the flexible element inserted into the body 1 of the seal cannot be removed without damaging the body. Thus, this position completes the first stage of pre-installation of the seal ready to be delivered to the addressee for further use.

[0021] Installation and blocking of the seal on the material object is performed as follows.

[0022] An operator inserts the free end of the flexible element through the openings or lugs of the object to be sealed and then passes it through the openings 3 of the cavity 2 and the openings 7 of the rotor 6 and then rotates the rotor 6 with the handle 11 winding the flexible element on it until it is fully tensioned. Then, the external walls of the blocking device 5 are exposed to an action until its full insertion into the inner part of the cavity 4 in such a way that the cavity with the outer surface 14 with a trapezoidal groove 15 would come into contact with the blocking cross-shaped element 9 of the rotor 6. As a result of the coupling of the fork-shaped projections 13 of the blocking device 5, the rotor 6 is completely locked on both sides, preventing its rotation and extraction. Thus, the procedure for the final installation of the seal is completed after which the handle 11 should be broken off at the thinning point 12 from the contact area with the outer surface of the rotor 6.

[0023] Thus, the proposed invention has the following advantages: [0024] The design of the seal meets modern technological requirements; [0025] The technical solution of the blocking device provides effective and irreversible sealing as well as reliable protection of the sealed object from unauthorized disassembly; [0026] Ability to place the information about the seal due to the bar code; [0027] Production of seals in blocks of 5 pieces; [0028] Ability to automate the assembly and reduce the cost of the seal; [0029] Ability to install the seal in two stages: 1pre-installation; 2final installation and blocking of the rotor.

BIBLIOGRAPHIC REFERENCE

[0030] 1. MD 3134 G2 [0031] 2. RO 119490 B1 [0032] 3. U.S. Pat. No. 5,402,958 A [0033] 4. MD 4034 C1