Detachable barrier for electrical switching apparatus
An arc shield for electrical switching apparatuses is provided. The arc shield comprises a mounting base and a detachable barrier and includes a multi-point mounting system that eliminates the need for hardware and gloves when installing the detachable barrier on the mounting base. The mounting base is formed with a hinge tab and two locking tabs, and the detachable barrier is formed with a corresponding notch and two tab receiving openings formed with retention profile. The notch can be seated on the hinge tab in order to establish a hinge, and once the hinge is established, the locking tabs can be inserted through the tab receiving openings by bending the detachable barrier. Once the bending force is removed, the retention profiles of the locking tabs ensure that the detachable barrier cannot be removed from the mounting base unless a bending force is intentionally reapplied to the barrier.
1. An arc shield for an electrical apparatus, the arc shield being structured to shield a user from energized electrical components in the electrical apparatus, the arc shield comprising:
a mounting base, the mounting base comprising:
a hinge tab, the hinge tab including a ledge portion and a lip portion; and
two locking tabs, each locking tab including a retention portion with a retention profile; and
a detachable barrier, the detachable barrier comprising:
a notch; and
two tab receiving openings,
wherein each tab receiving opening has a corresponding locking tab, the corresponding king tab being one of the two locking tabs,
wherein the notch is structured to be seated upon the ledge portion of the hinge tab such that the detachable barrier is positioned between a front surface of the mounting base and the lip portion of the hinge tab,
wherein each locking tab has a tab width relative to a lengthwise dimension, the lengthwise dimension being orthogonal to the front surface of the mounting base, and
wherein, for each tab receiving opening, the tab receiving opening is structured to enable the retention portion of the corresponding locking tab to extend frontward relative to a front surface of the detachable barrier, such that the retention portion obstructs the detachable barrier from moving frontward past the retention profile when no bending force is exerted upon the detachable barrier.
2. The arc shield of claim 1 ,
wherein the detachable barrier is structured to be planar when no external force is acting upon the detachable barrier,
wherein the detachable barrier is structured to require a bending force to be exerted upon the detachable barrier in order to enable the locking tabs to be inserted frontward through the tab receiving openings.
3. The arc shield of claim 1 ,
wherein the hinge tab extends frontward relative to the front surface of the mounting base, and
wherein each locking tab extends frontward relative to the front surface of the mounting base.
4. The arc shield of claim 1 ,
wherein the detachable barrier is structured such that, when the notch is seated upon
the ledge portion of the hinge tab:
for each tab receiving opening, some portion of the tab receiving opening is
an aligning portion that partially aligns with the tab width of the corresponding locking tab when no bending force is acting upon the detachable barrier,
the detachable barrier can be bent in order to enable the aligning portion of each tab receiving opening to fully align with the tab width of the corresponding locking tab.
5. The arc shield of claim 4 ,
wherein the tab receiving openings are U-shaped cutouts, such that each tab receiving opening comprises two arms connected by a bend extending between the two arms, and
wherein, for each tab receiving opening, the aligning portion is one of the two arms.
6. The arc shield of claim 5 ,
wherein, for each tab receiving opening:
the two arms include one medial arm and one lateral arm, and
a height of the medial arm and a height of the lateral arm are orthogonal to a bottom edge of the detachable barrier.
7. The arc shield of claim 1 ,
wherein the notch is formed as a cutout in a bottom edge of the detachable barrier such that the cutout extends upward from the bottom edge of the detachable barrier, and
wherein the tab receiving openings are positioned above the notch.
8. The arc shield of claim 7 ,
wherein the locking tabs are positioned above the hinge tab.
9. The arc shield of claim 1 ,
wherein, for each locking tab, the retention profile is formed as a curve orthogonal to the front surface of the mounting base.
10. The arc shield of claim 1 ,
wherein, for each locking tab, the retention profile is formed as a plurality of retention surfaces, with each retention surface having two adjacent surfaces and being positioned at an obtuse angle relative to the two adjacent surfaces.
11. A method of installing a detachable barrier in an electrical switching apparatus to form an arc shield, the method comprising:
providing a mounting base, the mounting base comprising:
a hinge tab, the hinge tab including a ledge portion and a lip portion; and
two locking tabs, wherein each locking tab:
includes a retention portion with a retention profile; and
has a tab width relative to a lengthwise dimension, the lengthwise dimension being orthogonal to a front surface of the mounting base;
providing the detachable barrier, the detachable barrier comprising:
a notch; and
two tab receiving openings, wherein each tab receiving opening has a corresponding locking tab, the corresponding locking tab being one of the two locking tabs;
seating the notch upon the ledge portion of the hinge tab such that the detachable barrier is positioned between the front surface of the mounting base and the lip portion of the hinge tab; and
for each tab receiving opening, inserting the retention portion of the corresponding locking tab through the tab receiving opening such that the retention portion extends frontward relative to a front surface of the detachable barrier.
12. The method of claim 11 ,
wherein the detachable barrier is structured to be planar when no external force is acting upon the detachable barrier, and
wherein the method further comprises bending the detachable barrier in order to insert the locking tabs through the tab receiving openings.
13. The method claim 11 ,
wherein the hinge tab extends frontward relative to the front surface of the mounting base, and
wherein each locking tab extends frontward relative to the front surface of the mounting base.
14. The method of claim 11 ,
wherein the detachable barrier is structured such that, when the notch is seated upon the ledge portion of the hinge tab:
for each tab receiving opening, some portion of the tab receiving opening is an aligning portion that partially aligns with the tab width of the corresponding locking tab when no bending force is acting upon the detachable barrier, and
wherein the method further comprises:
identifying the aligning portion of each tab receiving opening and bending the detachable barrier,
for each tab opening, fully aligning the aligning portion of the tab receiving opening with the tab width of the corresponding locking tab prior to inserting the retention portion of the corresponding locking tab through the tab receiving opening, and
removing all bending force from the detachable barrier once the retention portion of each locking tab extends frontward relative to the front surface of the detachable barrier.
15. The method of claim 14 ,
wherein the tab receiving openings are U-shaped cutouts, such that each tab receiving opening comprises two arms connected by a bend extending between the two arms, and
wherein, for each tab receiving opening, the aligning portion is one of the two arms.
16. The method of claim 15 ,
wherein, for each tab receiving opening:
the two arms include one medial arm and one lateral arm, and
a height of the medial arm and a height of the lateral arm are orthogonal to a bottom edge of the detachable barrier.
17. The method of claim 11 ,
wherein the notch is formed as a cutout in a bottom edge of the detachable barrier such that the cutout extends upward from the bottom edge of the detachable barrier, and
wherein the tab receiving openings are positioned above the notch.
18. The method of claim 17 ,
wherein the locking tabs are positioned above the hinge tab.
19. The method of claim 11 ,
wherein, for each locking tab, the retention profile is formed as a curve orthogonal to the front surface of the mounting base.
20. The method of claim 11 ,
wherein, for each locking tab, the retention profile is formed as a plurality of retention surfaces, with each retention surface having two adjacent surfaces and being positioned at an obtuse angle relative to the two adjacent surfaces.