A reusable device for holding and releasing a bar. The device includes a tightening component, a hold and release component, and at least one loosening component. The hold and release component includes a plurality of segments, each segment includes a first bearing surface configured to bear on part of the bar, when the plurality of segments is in a holding configuration under the effect of a tightening pressure generated by the tightening component. The plurality of segments includes a second bearing surface configured to bear on one end of the at least one loosening component. The at least one loosening component is made from a first single-acting shape memory material. Each end of the at least one loosening component exerting a loosening pressure compensating for the tightening pressure, so as to place the hold and release component in a configuration in which the part of the arm is released.

A system for carrying or using a device includes the device and at least one attachment apparatus. The device may include at least one attachment element. The attachment apparatus may include a length of material and at least one attachment point arranged on an end of the length of material. The at least one attachment point may include at least one magnetic feature configured to attach and detach the device and the length of material. The material can include but is not limited to cloth, metallic (magnetic and non-magnetic), fibrous material, and so forth.

A system for carrying or using a device includes the device and at least one attachment apparatus. The device may include at least one attachment element. The attachment apparatus may include a length of material and at least one attachment point arranged on an end of the length of material. The at least one attachment point may include at least one magnetic feature configured to attach and detach the device and the length of material. The material can include but is not limited to cloth, metallic (magnetic and non-magnetic), fibrous material, and so forth.

A system for locating a first component with respect to a second component. The system includes a bracket and a coupling member. The bracket defines a base wall and a side wall. The side wall extends from the base wall and defines an end remote to the base wall. The side wall defines a thickness and a length spanning from the base wall to the end. The coupling member is fastened to the base wall, and is configured to couple the base wall with the first component. The side wall is configured to be brought into contact with the second component to space and locate the second component with respect to the first component by at least one of the thickness defined by the side wall or at least a portion of the length defined by the side wall.

A device for mounting a leap block capable of automatically adjusting the mounting direction of the leap block comprises a block stand fixedly mounted to one end of a blocking device frame and configured to support a leap block so that the leap block is rotatable in a horizontal direction; the leap block in which a support rotatably supported by the block stand is formed in the center, and a first magnetic body is mounted in one direction; and a leap block mounting unit to which a second magnetic body that couples with the first magnetic body by magnetic force is mounted in one direction, and which rotates in the horizontal direction and couples with the leap block in a fixed direction.

A device for mounting a leap block capable of automatically adjusting the mounting direction of the leap block comprises a block stand fixedly mounted to one end of a blocking device frame and configured to support a leap block so that the leap block is rotatable in a horizontal direction; the leap block in which a support rotatably supported by the block stand is formed in the center, and a first magnetic body is mounted in one direction; and a leap block mounting unit to which a second magnetic body that couples with the first magnetic body by magnetic force is mounted in one direction, and which rotates in the horizontal direction and couples with the leap block in a fixed direction.

A display system comprises a display board comprising opposed front and back surfaces; at least one elongated channel formed in the front surface; wherein each elongated channel is recessed with respect to the front surface of the display board. The elongated channel comprises a plurality of substantially parallel elongated channels vertically spaced from one another; a metal strip disposed within each elongated channel. The metal strip has a front surface recessed with respect to the front surface of the display board. The metal strip is configured to display at least one display item having a magnetic element. The magnetic element shares at least one dimension with the width of a respective metal strip. The cover layer covers the front surface of the display board and the metal strip disposed in each channel. The cover layer follows contours of the front surface of the metal strip disposed in each channel.

A display system comprises a display board comprising opposed front and back surfaces; at least one elongated channel formed in the front surface; wherein each elongated channel is recessed with respect to the front surface of the display board. The elongated channel comprises a plurality of substantially parallel elongated channels vertically spaced from one another; a metal strip disposed within each elongated channel. The metal strip has a front surface recessed with respect to the front surface of the display board. The metal strip is configured to display at least one display item having a magnetic element. The magnetic element shares at least one dimension with the width of a respective metal strip. The cover layer covers the front surface of the display board and the metal strip disposed in each channel. The cover layer follows contours of the front surface of the metal strip disposed in each channel.

An apparatus having components that are interconnectable without fasteners. A first component includes a male connection portion including a connection wall defining a non-circular, closed-geometric shape, and one or more grooves extending along a least a portion of an outer side of the connection wall. A second component includes a female connection portion including a capture wall defining a shape within which the connection wall fits in a first orientation and a second orientation. The second orientation is a fastened state achieved via a rotational twist action of the first component with respect to the second component. One or more protrusions extend inwardly from the capture wall. The one or more protrusions are sized to engage the one or more grooves of the connection wall of the first component when the connection wall is oriented in the second orientation within the capture wall.

An apparatus having components that are interconnectable without fasteners. A first component includes a male connection portion including a connection wall defining a non-circular, closed-geometric shape, and one or more grooves extending along a least a portion of an outer side of the connection wall. A second component includes a female connection portion including a capture wall defining a shape within which the connection wall fits in a first orientation and a second orientation. The second orientation is a fastened state achieved via a rotational twist action of the first component with respect to the second component. One or more protrusions extend inwardly from the capture wall. The one or more protrusions are sized to engage the one or more grooves of the connection wall of the first component when the connection wall is oriented in the second orientation within the capture wall.