Abstract: A speed sensitive safety lock is provided for arresting and holding a control member when it is moved above a predetermined speed along a control path in one plane in close proximity to a stationary surface. The safety lock comprises a mounting portion for mounting the safety lock to either the stationary surface of the control member, and an arresting member pivotably supported on the mounting portion having a contact surface on one end for making a glancing contact with a part on the control member or the stationary surface as the control member is moved along the control path, and an arresting portion on another end which is movable so as to arrest the control member from further movement when the glancing contact is made at a speed in excess of a predetermined level. The preferred form of the lock has a single moving part and can be readily retrofitted to existing devices.

Abstract: An improved sheet folding method comprises forming an upper folding template and a lower folding template having plate elements corresponding to predetermined fold configurations desired to be formed, the plate elements being interconnected along respective joining lines between adjacent plates by thin, flexible joining parts which allow the plate elements to be folded together along the joining lines, placing a sheet to be folded between the upper and lower folding templates, then folding the stacked sheet and templates together according to the order of the fold configurations desired, whereby the desired fold lines are formed in the sheet corresponding to the joining lines betwen the plate elements in the order of the fold configurations.