Mechanical safety interlock for covers of explosionproof electrical housing专利检索-抗爆性燃油喷射和点火系统专利检索查询-专利查询网

Mechanical safety interlock for covers of explosionproof electrical housing

阅读：354发布：2023-07-17

专利汇可以提供Mechanical safety interlock for covers of explosionproof electrical housing专利检索，专利查询，专利分析的服务。并且An explosionproof electrical enclosure has a body with two caps threaded on opposite ends of the body. Within the body is an electrical switch operable by a handle positioned outside the body. The caps are held against rotation by pins which extend through the body and are resiliently urged into recesses in the caps. These pins are accessible from outside the body so that they can be moved out of the recesses thereby allowing the caps to be rotated and unthreaded. A second set of pins adjacent and parallel to the first are moved longitudinally by the caps when the caps are removed or replaced. A safety interlocking mechanism includes plates positioned adjacent the inner ends of the pins and movable coincident with the turning of the handle between the switch-open and the switch-closed position. This interlocking mechanism prevents the first pins from being unseated from the cap recesses so long as the electrical switch is closed and prevents the handle from being turned from the switch-open to the switch-closed position so long as one or both of the second pins detects the absence of a cap.，下面是Mechanical safety interlock for covers of explosionproof electrical housing专利的具体信息内容。

权利要求

1. In an explosionproof electrical enclosure apparatus comprising a housing having a body with an opening with threads therearound and a cap threaded onto said threads and covering said opening, an electrical switch within said housing and operable between a switch-open position and a switch-closed position, said switch having a member within said housing for moving the switch between said positions which member is operable from outside said housing, a locking device interengaging said cap of said housing and movable between a first position at which said cap is locked at a desired location against rotation and a second position at which said cap is free to be rotated to unthread the cap for removal to expose said opening, said locking device being operable from outside said housing, the improvement comprising: interlocking means operatively interconnecting the switch operating member and said cap locking device for retaining said locking device in said first position so long as the member is in the switch-closed position while freeing the locking device for movement to the second position so long as the member is in the switch-open position, and for normally blocking the member for movement from switch-open to switch-closed position so long as the cap is off the body, said interlocking means including a sensor positioned to be contacted by said cover and in a first position when said cover is in place and to be moved to a second position when said cover is off the body; said locking device including a first pin in said body and movable in a direction generally parallel to the axis of the threads between a blocking position and an unblocking position, said cap having abutment means positioned adjacent the pin when the cap is in place and said pin is in the blocking position to prevent rotation of the cap to unthread the cap from the body, resilient means bearing on the pin to urge the pin to said blocking position, said pin being movable against said resilient means to said unblocking position at which said cap may be rotated; said sensor including a second pin on said body, movable in a direction generally parallel to the axis of the threads and positioned so that one end of the second pin will contact said cap when said cap is in place, resilient means bearing against the second pin and urging it in the direction of said one end, whereby said second pin is held in a first position by the pressure of said cap when the cap is in place and is moved to a second position by the last-mentioned resilient means when the cap is removed; and said interlocking means including a plate movable in said housing and having portions adjacent said pins, said plate being connected to said member.

2. In an apparatus as set forth in claim 1, wherein said pins each have a longitudinal axis, said plate bEing movable in a plane intersecting said axes between a first position at which the member is in the switch-closed position and a second position at which the member is in the switch-open position, said plate having a closed area aligned with the axis of the first pin when the member is in the switch-closed position with said closed area being positioned to block movement of the first pin from the blocking to the unblocking position, said plate having an open area aligned with the axis of the first pin when the member is in the switch-open position with said open area unblocking said first pin so that it may be moved to the unblocking position, said second pin having an abutment thereon which abutment is moved with the second pin, said abutment being positioned to block the movement of the plate from the switch-open to the switch-closed position when the second pin is in its second position, said abutment being moved to an unblocking position when the second pin is moved to the first position.

3. In an apparatus as set forth in claim 2, wherein said cap has a flange thereon, said abutment means being in the side of said flange adjacent said body, said flange having a small opening extending from said abutment means to the other side of the flange, whereby a small object may be inserted through said small opening to move the first pin from the blocking to the unblocking position.

4. In an apparatus as set forth in claim 2, wherein as said cap is moved toward said desired location by the rotation of said cap and said second pin is being moved from said second position toward said first position to release said plate, said first pin is simultaneously being moved by the cap into a position at which it blocks the movement of the plate until the cap reaches said desired location and the first pin engages said abutment means thereby moving the first pin out of blocking position to free said plate.

5. In an apparatus as set forth in claim 1, wherein said cap has a flange thereon, said flange having a recess in the side of said flange adjacent said body and defining said abutment means, said flange having a small opening extending from said recess to the other side of the flange, whereby a small object may be inserted through said small opening to move the first pin from the blocking to the unblocking position.

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Mechanical safety interlock for covers of explosionproof electrical housing

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