GB498334A - Improvements relating to loose leaf binders or books - Google Patents

Abstract

498,334. Loose - leaf binders. McGREGOR, W., and DUNCAN & SON, Ltd., G. Aug. 7, 1937, No. 21826. [Class 146 (i)] In a thong binder in which the stretcher-bar g is actuated by a screwed-spindle k engaging a nut therein to tighten the thongs, the nut is made in two parts h, i movably mounted so as to be released from the spindle k when rapid adjustment is necessary. In one form, the parts h, i are mounted on pivots j and are geared together for simultaneous movement. The threaded portions of the nut engage the spindle k at the side of the pivots j nearer to the clamping edge of the cover so that the parts h, i have a tendency to grip the spindle when the thongs are tightened. A spring q holds the parts h, i in either the gripping or releasing position and a knob n is provided for operating them. In modifications, the knob k is replaced by a keyoperated pinion engaging teeth on the part h or by a key-operated screwed spindle pivoted to the part h and the pinion may be replaced by a rotary cam. Alternatively, the parts h, i may be connected by toggle links having a central operating knob. Further, the parts h, i may be slidable apart against spring-action and operated by a toggle-link arrangement. Instead of the toggle-links, a slidable plate having cam slots engaging pins on the parts h, i may be employed.