Patent GB-622653-A (GB)
Title: Improvements in or relating to a method of, and apparatus for making brushes
IPC: A46B3/12
Filed: 1946-05-02
Abstract: 622,653. Shaping brush heads, and apparatus therefor. MEYER, V. F., and MEYER, H. B. May 2, 1946, No. 13413. [Class 19] Apparatus for assembling hair or like material to form a shaped brush-head comprises a substantially cylindrical shaped knocker open at the upper end and closed at the lower end, the inner surface of the walls being smooth at the upper end and roughened at the lower end, which is of tapering or conical formation, whereby the peripheral elements of the hair or like material are held substantially stationary during the knocking operation, while the more central elements pass freely into the base of the knocker. Alternatively the apparatus may comprise a substantially cylindrical shaped knocker constructed in two parts comprising an upper part open at both ends and having a smooth inner surface and a lower part closed at its bottom end detachably secured to the upper part and having a rough inner surface shaped according to the shape of brush-head required to be made. Fig. 1 shows a knocker of this type, the inner surface 4, 5 of the base part being roughened. The roughening may be effected either by submitting the base of the knocker to a process of oxidation so as to coat it with metallic oxide or by first coating the inner surface with glue and then spraying with a finely divided powder or metal, dust. The two parts of the knocker may be secured by screw threading as shown or by means of a push-fit. Figs. 2 and 4 show a machine for effecting successive lifting and dropping movement of the knockers. The machine comprises a horizontal shaft 9 mounted between frame members 7 and carrying a series of cams 10 and is provided with a transverse plate 11 immediately above the shaft 9, the cams being adapted to project through slots in the plate 11 and the position of the shaft and cams relative to the plate 11 may be adjusted by carrying the shaft 9 in bearings 13 slidably mounted in the said frame members. A plate 16 detachably secured to the plate 11 has cylindrical apertures to receive the knockers 18 so that the bases of the latter rest on the surfaces of the cams. The shaft 9 may be driven by the pulley wheel 19 and the cams are so shaped that they lift and drop the knockers once for each complete revolution. A pair of clamping plates 27, 28 having serrated edges are slidably mounted in slotted guides 25, 26 carried on side frames secured to the frame members 7 by means of brackets. The clamping plates are controlled by the knurled wheel 31 which is mounted on a shaft 32 carrying two pinion wheels which engage with a pair of racks 35, 36 disposed under the clamping plate 28.. The clamping plate 27 has a similar pair of racks which engage with a pair of pinion wheels mounted on a shaft 41 which is geared to the shaft 32 so that rotation of the wheel 31 in one or other direction causes the clamping plates to approach or recede from one another, the guides 25, 26 being slotted so as to cause the serrated edges of the plates to overlap one another. When the knocking operation is completed the plates 27, 28 are moved together so as to clamp the bundles of hairs in the knockers between the serrated edges so that the hairs may be tied or secured prior to removal. Other arrangements may be employed for lifting and dropping the knockers, e.g. a vibrating device, a system of eccentrics or a quick return mechanism. According to the Provisional Specification the slotted plate 11 or the mounting plate 16 may be provided with a pair of side arms pivotally mounted and spring loaded and arranged to converge together above the mounting plate and having means for holding the hair in position in the knockers prior to its removal.