Screw-threaded fasteners

A torque-limiting screw-threaded fastener has a body (10) provided with a principal head (11) by means of which that body may be rotated, the body being screw-threaded over at least part of its length. A socket (14) is formed in the principal head (11), a part (17) of a torque member (15) being non-rotatably received in that socket (14). The torque member has a sacrificial head (16) by means of which torque may be applied to the body. The sacrificial head (16) is arranged to shear off that part (17) of the torque member received in the socket (14) when a torque in excess of some predetermined value is applied to the sacrificial head. That part (17) remaining in the socket is appropriately coded so that an inspection of the principal head (11) will show the torque to which the fastener has been subjected.

Buoyant force

Containers

Knot tying and teaching device

A knot tying and teaching device includes a frame (1) and fingers (2) with aperture (9). Each aperture is uniquely identifiable relative to the side of the device from which said aperture is seen so that a rope (11) threaded through the apertures in accordance with a pre-determined scheme for a particular type of knot form that knot through the device. To remove a knot from the device, the fingers (2) are released from the frame (1) allowing each of the fingers (2) to be rotated around the hinges (5) relative to the frame (1) and independently of the other fingers thus enabling the size of the apertures between any two adjacent fingers or a finger adjacent to the frame to be increased allowing the knot to be removed from the fingers (2).

Knot tying and teaching device

A knot tying and teaching device includes a frame (1) and fingers (2) with aperture (9). Each aperture is uniquely identifiable relative to the side of the device from which said aperture is seen so that a rope (11) threaded through the apertures in accordance with a pre-determined scheme for a particular type of knot form that knot through the device. To remove a knot from the device, the fingers (2) are released from the frame (1) allowing each of the fingers (2) to be rotated around the hinges (5) relative to the frame (1) and independently of the other fingers thus enabling the size of the apertures between any two adjacent fingers or a finger adjacent to the frame to be increased allowing the knot to be removed from the fingers (2).

Bath safety plug

Fresh beverage maker

Fresh beverage maker

Fresh beverage maker