A mounting unit ( 10 ) for mounting an electrical component ( 16 ) to a panel has a first member ( 12 ) arranged to engage a first side of said panel and a second member ( 14 ) arranged to engage the first member and a second, opposite side of said panel, so as to secure the first and second members to opposite sides of the panel through a hole in the panel. The first and second members define a space for receiving the electrical component. The mounting unit is particularly suitable for mounting the electrical component to a ceiling tile.
1. A mounting unit for mounting an electrical component to a panel comprising:
a first member arranged to engage a lower side of said panel, the first member being a bezel; and
a second member comprising a ring arranged to abut an upper, opposite side of said panel, the second member arranged to engage the first member, so as to secure the first and second members to opposite sides of the panel through a hole in the panel;
wherein the mounding unit comprises complementary ratchet portions for securing the first and second members to one another, the mounting unit being arranged such that the first and second members may be mounted together in a first position in which the ratchet portions engage, and in a second position in which the ratchet portions do not engage, and
wherein the first and second members define a space for receiving the electrical component from above the mounting unit.
2. A mounting unit according to claim 1 , wherein neither the first member nor the second member is an electrical component.
3. A mounting unit according to claim 1 , wherein the mounting unit comprises a connector for securing the members to one another.
4. A mounting unit according to claim 1 , wherein one of the first and second members comprises a plurality of locking ridges, the slope of which extends in a first direction, and the other of the first and second members comprises one or more locking ridges, the slope of which extends in a second direction substantially opposite to the first direction.
5. A mounting unit according to claim 1 , wherein the bezel comprises a bezel ring arranged to abut the panel to which the mounting unit it is to be fitted.
6. A mounting unit according to claim 1 , further comprising a rotation restrictor for restricting rotation of the electrical component relative to the mounting unit.
7. A mounting unit according to claim 6 , wherein the rotation restrictor comprises at least one tooth in one member, arranged to engage a complementary recess in the other.
8. A mounting unit according to claim 1 , further comprising a catch for securing the electrical component thereto.
9. A mounting unit according to claim 8 , wherein the catch comprises at least one cantilever arm, the or each arm being arranged to engage and secure the electrical component to the mounting unit.
10. A mounting unit according to claim 8 or claim 9 , wherein the catch comprises a snap-fit arrangement.
11. A mounting unit according to claim 1 , wherein the second member comprises a ring arranged to abut the panel to which the mounting unit it is to be fitted.
12. A mounting unit according to claim 1 , further comprising a panel locator for restricting rotational movement of the mounting unit relative to said panel.
13. A mounting unit according to claim 12 , wherein the second member comprises at least one hole for receiving a screw for securing the second member to the panel.
14. A mounting unit according to claim 12 or claim 13 , wherein the panel locator comprises a spur arranged to engage said panel in use.
15. A mounting unit according to claim 1 , further comprising a resilient arm arranged to engage said panel in use.
16. A mounting unit according to claim 14 , when dependent from claim 13 , wherein the spur extends substantially perpendicularly from the resilient arm.
17. A mounting unit according to claim 16 , wherein the second member comprises a hole adjacent to the means for securing the members to one another.
18. A mounting unit according to claim 1 , wherein the first and second members of the mounting unit are shaped such that relative rotation of said members is restricted.
19. A mounting unit according to claim 18 , wherein a protrusion is formed on one of the first and second members, and a complementary recess is formed on the other of the first and second members.
20. A mounting unit according to claim 1 , wherein said panel is a ceiling tile.
21. An electrical component for mounting in the mounting unit of claim 1 .
22. An electrical component according to claim 21 , comprising a restrictor for restricting rotation thereof relative to the mounting unit.
23. An electrical component according to claim 22 , wherein the rotation restrictor comprises a protrusion arranged to abut a complimentary protrusion on the mounting unit.
24. A mounting unit according to claim 1 , wherein the ratchet portions are arranged circumferentially around the surface of the first and second members.
25. A mounting unit according to claim 18 , wherein a plurality of protrusions are formed on one of the first and second members, and a plurality of complementary recesses is formed around a circumference on the other of the first and second members.
26. An electrical component according to claim 22 , wherein the restrictor comprises castellations formed around a circumference of the electrical component.