kippah

A kippah is a small hinged or pivoting bucket, typically made from steel or aluminum, that tips material downward into a receiving hopper, chute, or conveyor. The bucket rotates on a fixed axis, allowing an operator or automatic mechanism to discharge its contents by tilting it forward or to one side. The term appears in European manufacturing contexts, particularly in Central Europe, where it describes a simple but essential component of batch feeding systems.

The kippah holds material, powders, granules, small parts, or other dry goods, and releases it in controlled quantities. A latch or detent mechanism typically holds the bucket in the receiving position while it fills, then releases to allow gravity to empty the contents. The pivot point is usually mounted at the rear or side of the bucket, requiring minimal clearance. Capacities range from a few liters for precision dosing applications to several hundred liters for bulk material handling.

Construction and variants

Most kippahs are fabricated from 1.5 to 2 mm sheet steel with reinforcing ribs or flanges along the bottom edges to resist deformation under load. The pivot hinge uses a threaded or bolted rod mounted to a fixed frame, often with a bushing or bearing to reduce friction and wear. Some versions feature a counterweight or spring return to restore the bucket to the receiving position after discharge. Aluminum construction appears in food and pharmaceutical applications where corrosion or contamination control matters, though it is more expensive and less durable under abrasive loads.

The kippah differs from a simple chute because it actively contains and meters material; it differs from a full-scale reciprocating or rotary feeder because it relies on gravity and simple mechanics rather than active conveying. This makes it economical and reliable for applications where batch sizing is more important than continuous flow. It sits between manual transfer buckets and automated weigh-batch systems in the hierarchy of charging equipment.

Wear occurs at the pivot point and along the lower lip where the bucket seats against the hopper opening. Debris or moisture can cause the latch to bind. Industrial practice involves periodic lubrication of the hinge and inspection of the latch mechanism. In dusty environments, a flexible spillguard or lip seal reduces spillage and contains fines, though it must be designed to clear the bucket movement without binding.