| 摘要 |
1,181,783. Hand shears. WILKINSON SWORD Ltd. 15 March, 1967 [29 March, 1966], No. 13715/66. Heading B4B. A hand tool such as a pair of shears comprises a pair of pivotally-connected blades, a first handle rigid with a first blade and a second handle connected to a second blade through a coupling comprising rolling elements, e.g. balls resting in recesses in the coupling parts, the coupling being effective, when the tool is cutting or shearing a piece of material, to bias the blades towards one another in a direction perpendicular to the direction of their relative movement with a force which is related to the resistance offered by the material. In one embodiment, the coupling between a blade 21 and its handle 23, comprises balls 31 resting partly in recesses formed in a plate 27 secured to the handle 23 and partly in recesses formed in the blade 21, relative movement of the handles causing the balls to ride partially out of the recesses and thereby generate a force in a direction normal to the direction of the relative movement to bias the blades towards one another. In another embodiment, Fig. 5, a blade 41 is rigid with a handle 42 and carries a pivot 43 on which the blade 40 is pivoted. The blade 40 is movable relative to the blade 41 by a coupling 44 comprising balls 49 nesting in frustro-conical recesses 48 in a plate 45 and in the upper face of the blade 40, the plate 45 having a shoulder (55), Fig. 7 (not shown), engageable by a finger 54 on a plate 52 carried by a movable handle 50 pivoted to the handle 42. |
