Patent GB-190628654-A (GB)
Title: Grinding Machine particularly suitable for Grinding Certain Parts of "Spiral" Chucks.
Inventor: TAYLOR CHARLES
Filed: 1906-12-15
Granted: 1907-04-04
Abstract: 28,654. Taylor, C., and Taylor, G. B. Dec. 15. Screwing.-Relates to a grinding-machine particularly suitable for grinding screw-threads on the internal conical faces of rings, such as those used in " spiral " chucks. The work is rotatably held in a chuck and is operated upon by a grinding-wheel, mounted on a system of slides and traversed parallel to the face of the cone. The direction of motion of the tool is periodically reversed automatically, and an automatic device is provided which compensates for the back-lash due. to reversing. The work x, Fig. 2, is held in a chuck d mounted on a head a of the usual lathe type. A shaft a<5> adjustable longitudinally in a sleeve a<6>, which is driven through an intermediate shaft a<2> from the lathe head, carries a skew gear a<4> engaging with a skew gear e<4> driving a screw e<20> mounted in bearings on a saddle e, which is adjustable along the machine bed by a screw e<2>. The cross-piece of the saddle e carries a slide f, Figs. 2 and 3, which is traversed parallel to the conical surface either by hand through a screw f<2>, or automatically by the screw e<20> which engages a nut f<6> carried by a block f<8> which slides in ways on the saddle e and acts as a journal for a plain end of the screw f<2>. The saddle e carries in bearings e<6>, e<7>, e<8>, Fig. 3, a shaft g, from which depends a pin g<20> which engages between screw-thread parts h<2>, h<3> on a sleeve h, slidable along and rotatable with a shaft i. The sleeve h is moved along the shaft i when the saddle e is adjusted along the bed c by a pin e<18>, carried by the saddle and fitting between shoulders h<4> on the sleeve. Stops f 9, f<10> adjustable along the edge of the slide f come, as the slide traverses, into contact with a projection h<5> on the sleeve, and cause the shaft i to rotate and so operate a belt-shifting or other mechanism to reverse the rotation of the lathe head a. The rotation of the screw-thread parts h<2>, h<3> on the sleeve h causes a slight rotation of the shaft g; this is communicated through a link g<5> to the screw shaft f causing it to rotate through a sufficient angle to compensate for the back-lash due to raversing the direction of motion. An arm g<2>, Fig. 7, is adjustably mounted on the shaft g, and an arm g<4> is carried by the bushing g<3> on the screw f<2>. The link g<5> is pivoted to the latter, its other end being adjustable along a slot on the arm g<2>. The rotation of the shaft i, consequent upon the engagement of,the stops j<9> or f<10> with the projection h<5>, causes a toothed quadrant i', Fig. 6, on the shaft to rotate a pinion i<6> on another shaft carrying a weighted arm i<8>, so that the arm is carried just over the vertical position. The further motion of the arm causes the projection i<5> to operate the rotary pin i<9> and, through a link i<10>, the belt-shifting or other reversing-mechanism. The slide f supports a swivelling. carrier j which can be clamped in position. This carrier supports a compound slide k, l operated by screws j<5>, k<4> having micrometer adjustments. On the top of this is mounted a carrier m, centrally pivoted and carrying the grindmg-wheets y, s<2> and an electric motor (not shows) to drive them. The grinding-wheel s<2>, which is slidable in its bearings by means of the toothed sector s' and rack s<5>, is used for grinding parallel work ; in this case the skew gears e<4>, a<4> are thrown out of action and the movement of the grinding-wheel is accomplished by a hand operation of the slides le, l and of the lever s<6>. Rests t are provided for trueing the grinding-wheels.