Explosion-proof assembly for guiding through a stud, and method for producing same

Patent metadata

Field	Value
Publication number	US-11004580-B2
Application number	US-201615748534-A
Country	US
Kind code	B2
Filing date	Jul 5, 2016
Priority date	Jul 28, 2015
Publication date	May 11, 2021
Grant date	May 11, 2021

Abstract

The invention relates to an explosion-proof assembly (22) having an electrically conductive stud (23) made of a material which is not deformable radially. The stud (23) is coaxially surrounded in a central portion (23a) by an electrically insulating, electrically insulating sleeve (30). The sleeve (30) is in turn coaxially surrounded by a connecting portion (41) of a plastically deformable connecting body (40). Plastic deformation of the connecting portion (41) reduces the outer dimension thereof and the connecting portion (41) presses inwardly against the sleeve (30) to form a frictionally engaged form-fitting connection therebetween such that the connecting body (40), the sleeve (30) and the stud (23) form a structural unit with at least one stop surface (26) on the stud (23) resting against a counter stop surface of the sleeve (30).

First claim

The invention claimed is:

1. An explosion-proof housing ( 20 ) comprising:
a wall structure that defines a flame-proof encapsulated area
an explosion-proof assembly ( 22 ) mounted within and extending through a wall ( 21 ) of said wall structure free of a flame ignition transmission gap between said explosion-proof assembly ( 22 ) and said wall ( 21 ),
said explosion-proof assembly including a non-deformable rigid electrically conductive stud ( 23 ) extending along a longitudinal axis (L) having a circumferential surface ( 25 ) extending around the longitudinal axis (L) and including a plurality of circumferential surface portions ( 25 a , 25 b , 25 c ), at least one of said circumferential surface portions ( 25 c ) forming a non-deformable rigid first stop surface ( 26 ) extending at an incline to the longitudinal axis (L),
an electrical insulating sleeve ( 30 ) made of an elastically deformable material having a sleeve inner surface ( 31 ) with a plurality of inner surface portions ( 31 a , 31 b , 31 c ), said sleeve inner surface ( 31 ) extending around the longitudinal axis (L) and resting against the circumferential surface ( 25 ) of the non-deformable rigid stud ( 23 ), at least one of the inner surface portions ( 31 c ) of the insulating sleeve ( 30 ) forming a first counter stop surface ( 32 ) which extends at an incline to the longitudinal axis (L) and which rests against said first non-deformable rigid stop surface ( 26 ),
a connecting body ( 40 ) surrounding at least one portion of the length of the sleeve ( 30 ) made of a plastically deformable material and having a plastically deformed connecting portion ( 41 ) pressing radially inwardly against the sleeve ( 30 ) for forming a frictionally engaged connection between the connecting body ( 40 ) and the sleeve ( 30 ) and between the sleeve ( 30 ) and the non-deformable rigid stud ( 23 ), and
said electrically conductive non-deformable rigid stud ( 23 ) being non-deformable under deformation forces on said connecting body ( 40 ) for pressing the connecting body ( 40 ) against the sleeve ( 30 ) for forming a frictionally engaged connection between the connecting body ( 40 ) and the sleeve ( 30 ) and between the sleeve ( 30 ) and non-deformable rigid stud ( 23 ) free of flame ignition transmission gaps.

2. The explosion-proof housing ( 20 ) of claim 1 in which said one first counter non-deformable rigid stop surface ( 32 ) is provided prior to the plastic deformation of the connecting portion ( 41 ).

3. The explosion-proof housing ( 20 ) of claim 1 in which said at least one first non-deformable rigid stop surface ( 26 ) is provided on an annular step of the non-deformable rigid stud ( 23 ).

4. The explosion-proof housing ( 20 ) of claim 1 in which said sleeve ( 30 ) has a sleeve outer surface ( 33 ) which rests against a passage surface ( 45 ) defined by a passage ( 44 ) extending through the connecting body ( 40 ) in the longitudinal direction (L).

5. The explosion-proof housing ( 20 ) of claim 4 in which said sleeve outer surface ( 33 ) has a plurality of outer surface portions ( 33 a , 33 b , 33 c , 33 d , 33 e ), and at least one of the outer surface portions ( 33 d , 33 e ) forms a second stop surface ( 34 ) extending at an incline to the longitudinal axis (L).

6. The explosion-proof housing ( 20 ) of claim 5 in which said passage surface ( 45 ) has a plurality of passage surface portions ( 45 a , 45 b , 45 c ), and at least one of said passage surface portions ( 45 c ) forms a second counter stop surface ( 46 ) which extends at an incline to the longitudinal axis (L) and which rests against said second stop surface ( 34 ) of said sleeve.

7. The explosion-proof housing ( 20 ) of claim 6 in which at least one of said second stop surface ( 34 ) of said sleeve and second counter stop surface ( 46 ) of said passage surface ( 45 ) is provided prior to the plastic deformation of the connecting portion ( 41 ).

Assignees

• Stahl R Schaltgeraete Gmbh

Inventors

• Kutsch Maxim
• Roll Fabian

Classifications

• H01B17/58 Primary

  Tubes, sleeves, beads, or bobbins through which the conductor passes · CPC title

• H02G3/22

  Installations of cables or lines through walls, floors or ceilings, e.g. into buildings · CPC title

• H01B17/583 Primary

  Grommets; Bushings · CPC title

• H01B17/308

  by compressing packing material · CPC title

• H01R13/527

  Flameproof cases (H01R13/70 takes precedence) · CPC title