Patent GB-370954-A (GB)
Title: Improvements in or relating to plungers for use with cases or holders for shaving soap sticks and for other purposes
IPC: A45D40/02
Filed: 1931-01-05
Abstract: 370,954. Sliding bolts. MARR, P. G., Rydens End, Walton-on-Thames. Jan. 5, 1931, No. 405. [Class 44.] Relates to non-return plungers for use as seals for sliding bolts and for other purposes and of the kind having a body formed or provided at the rear of a front transverse end wall with one or more projections for engaging the internal periphery of the barrel of the bolt and preventing movement of the plunger therein in one direction but not in the other and in which the length and diameter of the plunger in relation to the barrel are such as to prevent the plunger rocking therein to such an extent that the end wall can lie substantially out of a plane normal to the longitudinal axis of the barrel. According to the invention rearwardlydirected means extends from the end wall and is shaped to provide a cavity or space at the rear thereof. As shown in Fig. 2, the rearwardly-directed means 36 is in the form of an annular peripheral wall or skirt and the projections for engaging the inner surface of the barrel are formed by sharp teeth 37 arranged around the edge of the skirt adjacent an annular groove 38 therein ; the teeth may be blunt and the plunger is then particularly adapted for use with a barrel having internal peripheral grooves. The teeth 37 may be formed between the end wall 35 and the edge of the skirt 36 as shown in Fig. 22, the end 125 of the barrel of the sliding bolt 121 being grooved for engagement by the teeth 37 of the plunger ; a split pin 129 inserted through apertures in the barrel and plunger may be used to prevent accidental rupture of the seal. The teeth 55, Fig. 5, of the plunger may be formed at the end or ends of a leaf spring 54 sprung within the cavity at the rear of the end wall 35 of the plunger with the toothed end or ends projecting through slots 51 in the skirt thereof ; the spring is retained in the cavity by lugs 52 at the sides of the slots ; the spring may be retained in position by a slotted cap which is slid over or within the skirt of the plunger and secured thereto ; the spring may enter through holes or perforations in the skirt of the plunger and the skirt may have flexible lugs at the ends of a diameter at right-angles to the spring. The spring may be secured to the end of a stem projecting from the underside of the end wall and in this case the skirt of the plunger may be omitted ; the stem projecting from the end wall may be formed with a projecting circular flange toothed around its periphery to engage the barrel and slit radially to render it resilient. The plunger may be formed of resilient material 87, Fig. 13, with an annular flange 90 projecting from the rearwardly-directed skirt 86 for engaging the interior of the barrel and forced into engagement therewith when pressure is applied to the end wall 35 by a conical or other spring member 91 arranged within the cavity at the rear of the wall. In another form a rubber ring is held in an inset groove at the edge of the skirt of a cup-shaped metal plunger. The barrel in which the plunger slides may be formed of a metal, celluloid, cardboard, phenolic condensation product, &c. and the interior surface may be smooth or scored, roughened, pitted, or grooved and to facilitate entry of the plunger into the barrel the outer edge thereof may be flared outwards. The barrel 300 shown in Fig. 19 has V-shaped grooves 104 formed on its internal periphery for engagement by teeth 101 projecting at right-angles from the edge of the skirt 36 of the plunger 100 ; the skirt may be slit at 102 to render it resilient. Specifications 9289/97, 9557/10, 108,751, and 237,724, [all in Class 18, Boxes &c.], are referred to.