Abstract: A chalk reel includes a housing defining a chalk chamber and an opening from the chalk chamber; a spool positioned within the chalk chamber; and a line wound on the spool and extending through the opening, the line having a width of dimension X. The spool comprises an axial hub and a sidewall. The sidewall comprises a plurality of apertures extending through the sidewall from a first face distal from the axial hub to a second face proximal to the axial hub. Each of the plurality of apertures having a maximum width of dimension Y. The dimension Y is sized so that no loops of the line may fit through each of the plurality of apertures.

Abstract: A chalk reel includes a housing defining a chalk chamber and an opening from the chalk chamber; a spool positioned within the chalk chamber; and a line wound on the spool and extending through the opening, the line having a width of dimension X. The spool comprises an axial hub and a sidewall. The sidewall comprises a plurality of apertures extending through the sidewall from a first face distal from the axial hub to a second face proximal to the axial hub. Each of the plurality of apertures having a maximum width of dimension Y. The dimension Y is less than or approximately equal to twice the dimension X.

Abstract: A chalk reel includes a housing defining a chalk chamber and an opening from the chalk chamber; a spool positioned within the chalk chamber; and a line wound on the spool and extending through the opening, the line having a width of dimension X. The spool comprises an axial hub and a sidewall. The sidewall comprises a plurality of apertures extending through the sidewall from a first face distal from the axial hub to a second face proximal to the axial hub. Each of the plurality of apertures having a maximum width of dimension Y. The dimension Y is less than or approximately equal to twice the dimension X.

Abstract: A keyswitch includes a key cap, a base, a first support member, a second support member and a link member. The base has a first restraining portion and a third restraining portion. The first support member is disposed between the key cap and the base. The first support member has a second restraining portion. The first restraining portion restrains the second restraining portion from moving in a direction perpendicular to the base. The second support member is disposed between the key cap and the base and opposite to the first support member. The second support member has a fourth restraining portion. The third restraining portion restrains the fourth restraining portion from moving in the direction perpendicular to the base. When the key cap is pressed to a bottom of the base, the second and fourth restraining portions are located under the first and third restraining portions respectively.

Abstract: A keyswitch includes a key cap, a base, a first support member, a second support member and a link member. The base has a first restraining portion and a third restraining portion. The first support member is disposed between the key cap and the base. The first support member has a second restraining portion. The first restraining portion restrains the second restraining portion from moving in a direction perpendicular to the base. The second support member is disposed between the key cap and the base and opposite to the first support member. The second support member has a fourth restraining portion. The third restraining portion restrains the fourth restraining portion from moving in the direction perpendicular to the base. When the key cap is pressed to a bottom of the base, the second and fourth restraining portions are located under the first and third restraining portions respectively.

Abstract: The invention discloses a membrane cable including several metal wires, a cover body and a reinforcement plate. The cover body covers the metal wires, and the reinforcement plate is adhered to an external surface of the cover body. The cover body and the metal wires are bended toward the reinforcement plate, and the reinforcement plate can prevent the cover body and the metal wires from being over-bended.