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US8743662(PATIENTS PENDING LTD [GB])
[0018] Yet further features of the invention provide for the switch mechanism to include a leaf spring that projects into the interior of the body; for the leaf spring to be oriented so that it is has a fixed end closer to the first, open end of the body and a free end closer to the second, closed end of the body so that the act of inserting the front part of the device into the cap causes the leaf spring to flex towards the cavity without the free end hooking on any features at the front part of the device; and for the leaf spring to be mounted so as abut an electromechanical switch so as to actuate the switch when the leaf spring is bent towards the cavity. The leaf spring may be made from spring steel and may have sufficient flex no that differently shaped front parts of different devices will all engage the leaf spring sufficiently so as to activate the switch.

EP2708116(PIONEER PET PRODUCTS LLC [US])
[0037] During assembly, the basin 38 is attached to a perforate cage wall 34 such as via hooks that hook onto one of a plurality of generally horizontal wires or beams of a perforate cage wall 34. Where the basin 38 is mounted using a basket 82, the basket 82 can be attached first with its hooks 84 hooking on and over a generally horizontally extending wire or beam of the cage wall 34 before the basin 38 is place in the basket 82.

US2210661(LUFKIN FOUNDRY & MACHINE COMPA)
 The present invention therefore provides a convenient apparatus to disconnect one or more of the pull rods and to reconnect such rods, when desired, without disturbing the remainder of the system or interfering with the continuous operation thereof. The invention comprehends provision of means for effecting the hooking off and hooking on of the pull rods while the unit is operating and the mechanism for which will now be described. Sinc. e the mechanism for disconnecting or reconnecting the respective pull rods are alike, description of one only will given.