Abstract: A propulsion system assembly includes a propeller and a motor configured to drive the propeller to rotate. The propeller includes one of a first body and a second body. The motor comprises the other one of the first body and the second body. The propulsion system assembly also includes a locking mechanism configured to detachably connecting the first body and the second body. The locking mechanism includes a locking member and a position limiting lock catch. The locking member is configured to lock the first body and the second body. The locking member includes locking parts located at at least two sides of the locking member. When the locking parts of the locking member rotate to a locking position, the position limiting lock catch is mounted to a side of the locking parts, to restrain the locking member from rotating relative to the first body.

Abstract: A snap-type fastener arrangement includes various elements. For example, the snap-type fastener arrangement includes a socket component and a stud component. The stud component is insertable into the socket component to releasably couple two items together. The snap-type fastener includes a construction having a relatively low profile that does not extensively protrude outward from the underlying article to which the snap-type fastener is attached. The socket component includes a portion for securing the socket component to a textile layer and a central portion that extends through the textile layer. The stud component may be inserted into a socket aperture in the central portion of the socket in order to mate the two components.

Abstract: An audio demonstration kit encourages understanding of audio concepts by enabling children to construct and study speaker performance. In a particular example, the audio demonstration kit includes a paper speaker and instructions. The paper speaker includes a backplate, a suspension, and a diaphragm cut from a single sheet of paper. The demonstration kit may feature an amplifier that is configurable to accommodate various hardware additions as a child is ready for more progressively challenging construction. For example, the amplifier of an example allows single and dual mode operation, as well as drives a rotary motor and is coordinated with a strobe light. The amplifier of an example is synchronized with the strobe light and a moveable platform to create the impression of that jiggling figures attached to the table are dancing. Interfaces with smart phone, recording, and other technologies further enhances and encourages the learning experience.

Abstract: A foldable storage case comprises a one-piece, waterproof container. The container comprises a body, a bottom, and a cover, where the body, the bottom, and the cover form an interior space therebetween. The body comprises a plurality of body panels, the bottom comprises a plurality of bottom panels, and the cover comprises a plurality of cover panels. A plurality of removable fasteners is used to fasten together the body panels and the bottom panels. Further, each cover panel includes a projection adapted to be received by a receiving area of at least one of the body panels. When the cover is folded such that two or more projections are disposed adjacent each other within the receiving area, the projections and the receiving area interfere with each other, detachably securing the cover panels in place.

Abstract: An airtight cover assembly includes a side panel folded around goods on a pallet presenting top and bottom opening, a top panel with a plurality of pouches positioned on an inside surface above a vented rigid plate, and a bottom panel encloses the pallet. Hook and loop closures secure the panel assembly. Panel inner and outer surfaces of a poly-vinyl chloride material bonded to an aluminum laminate enclose multiple layers of foam.

Abstract: A bottle for liquids which is biodegradable and is comprised of pulp products.

Abstract: A container includes a body, a liner attached to the interior of the body, a lid dimensioned to attached to the top of the liner, and a perimeter seal attached to the lid. The lid includes a hole and the perimeter seal includes a region dimensioned to create a friction fit when disposed in the hole. Each of the body, the liner, and the lid may include a paper pulp coated with a biodegradable, organically derived, plastic resin. Methods of constructing the container are also disclosed.

Abstract: A box flap securing device for securing two opposing box flaps in a closed position wherein the box flap securing device includes a bottom member having an edge, a top member disposed a distance from the bottom member and in an overlying relationship with the bottom member, and a post interconnecting the bottom member and the top member. The post has an edge which is disposed in a coextensive relationship with at least a portion of the edge of the bottom member whereby the bottom member, top member and post cooperate to define a box flap receiving slot having a height at least equal to the thickness of the box flap but less than two times the thickness of the box flap.