Патент USA US2123017код для вставки
July 5, 1938. . _ ' K. MIEISTER“ JAW BREAK-ER Filed Aug; 2, 1935 2,123,017 Patented July 5, 1938 2,123,011 > ' UNITED STATES PATENT OFFICE 2,123,017 JAW BREAKER Karl Meister, Magdeburg, Germany, assignor to the ?rm Fried. Krupp Grusonwerk Aktienge sellschaft, Magdeburg-Buckau, Germany ' Application August 2, 1935, Serial No. 34,459 ' In Germany September 1, 1934 1 Claim. My invention relates to a jaw breaker, the jaws (Cl. 83-53) . trates a breaker constructed according to the of which lie one over the other and form an‘ .invention, in vertical section. obliquely extending breaking gap, the arrange ment being such that the lower jaw alone, or 5 both jaws, are adapted to be moved. In all law breakers, capable of disintegration of the material in a progressive manner-the breaking gap be comes narrower towards- the mouth of the jaws and the quantity of crushed material passing in therethrough becomes greater. Consequently, a constant overloading of the lower breaking zones occurs. In order to avoid this overloading, it has The upper breaking jaw 2 is secured to the frame I of the breaker, and beneath this upper jaw 2 the lower breaking jaw 3 is mounted in a 5 rocking member 4. This rocking member may be mounted and driven in various ways known per se. It may, for example, be adapted to piv ot at its upper end about a shaft 5 rigidly mount ed in the breaker frame, whilst the lower end may 10 be moved in‘ an upward and‘ downward direction already been proposed to widen the breaking jaws ‘ by means of an eccentric drive 6. As a further in the direction of the mouth or delivery gap. example, the rocking member could also be 16 This step, however, is in practice ineffective be cause the material only follows the surface of the widened portions within certain limits. It has also already been proposed to accelerate the pas _ sage of the disintegrated material by producing 50 a projecting movement in the lower breaking gap to avoid the. overloading of the lower breaking zones. This step, however, is contingent upon ' the material being charged in a grain size corre sponding approximately to the width of the upper 25 gap of the breaker. The object of the present invention is to pro duce a jaw breaker with which over-stressing in .the lower breaking zones and damming of the material to be broken are obviated, and with this 30 object in view, according to the invention the inclination of the breaking surface of the lower breaking jaw is increased in the direction of the delivery gap. In this case, the form of the break ing jaw is of minor importance but the clamping I6 angle between the two breaking jaws must be made such that the material to be broken does not jump upwards out of the breaking mouth during the breaking operation. It is preferable to adapt the upper breakingjaw to the lower ‘0 breaking jaw as far as possible by giving it an inwardly curved form The upper surface of the lower breaking jaw ' may, for example, be so shaped that the upper surface extends evenly or practically evenly at a “ small angle with respect to the horizontal, then falls in a slight curve and finally again falls away evenly or substantially evenly at a steeper angle. However, the entire surface may be‘ made in w arched form without departing from the scope of the invention‘. In order that the said invention may be clearly understood and readily carried into effect, the _ same will now be described more fully with ref “ erence to the accompanying drawing which illus ' mounted at its lower end on a support and be driven at‘ its upper end by an eccentric carried 15 by a driving shaft. ,A‘ccording'to the invention, the breaking surface of the jaw 3 is increasingly inclined in the direction of the delivery gap, this surface extending at a small angle relatively to the horizontal from a to b, but then merging.20 from b to 0 into a slight downwardly bent curve ' the curve extending downwardly more steeply from M. , > The surface of the upper breaking jaw .2 is curved inwardly to correspond to the curvature 25 of the lower breaking jaw. However, it could, for example, also extend evenly. The inclination of the breaking surface of the upper jaw is prefer ably such that at the entrance of the breaking space a further gap is formed which to a certain extent forms an extension of the charging hopper. The material to be broken may be charged into ‘ the filling hopper ‘l of the breaker in unlimited quantities, i. e. ‘the hopper may always be com pletely filled without fear of over-stressing the breaking jaws. Owing to the hereinbefore de scribed formation of the breaking jaw 3, the ma as terial to be crushed is, in the upper part of the breaking jaw where it lies on a slightly inclined surface, at ?rst retained somewhat and is only conveyed slowly towards the delivery gap. As, consequently, the material remains longer than usual in the upper breaking space, a much better utilization of the breaker results in this breaking 45 zone. - The material already su?lciently crushed in the upper breaking mouth is only ‘conveyed forward with increasing speed in proportion with the progressive crushing, so that the quantity of 50 crushed material and the conveyance of the ma terial in all zones of the breaking ‘mouth are sub stantially adapted to one another. ,The breaker consequently works in a completely uniform man- ' ner in all its breaking zones, and is not subjected 55 2,123,017 2 to any over-stressing owing to heavy charging oi.’ individual breaking zones. , The e?ectiveness of the form of the gap here inbeiore described may be further increased by making the stroke as long as possible and the number of rocking operations’ of the rocking law as large as possible, so that the material prefer ably completes a zig-zag movement over its con veying' path in the lower part of the gap, or even 10 a projecting movement in the direction of the ‘delivery gap may be imparted to the material. The material to be broken will thus, between two strokes, travel over a path which is in any case greater than the path over which it would travel 15 in the breaking gap merely owing to‘ the force of gravity. The magnitude of the movement of ' the material in the direction of the delivery gap, however, is also dependent on the ‘form. of the breaking mouth, this movement being greater 20 as the breaking surface repelling the material is steeper.v According to the present invention, the increase of speed for this movement towards the the material, that is to say, with a completely filled breaking mouth. What I claim is: A jaw breaker having a stationary upper law with an inclined lower crushing face, an inclined lower jaw pivoted at its upper end and having a crushing face opposed to said upper jaw, means for oscillating the lower end of said lower jaw toward and away from said upper law, a hopper above the upper end of said lower jaw, said lower 10 jaw having a receiving surface below said hop per inclined very slightly toward the discharge end of said jaws, the ‘crushing face of said lower jaw having a generally convex surface joined to the lower end of said receiving surface and slop ll ing downward therefrom, ?rst at an inclination just enough greater than the inclination of said receiving‘ area to feed the material thereon at a slightly greater speed, and then with a gradually increasing inclination toward the discharge end of said jaws, said upper jaw having a crushing face inclined somewhat more steeply than the average inclination of the face of said lower law, so as to form a gap of gradually diminishing size toward the discharge end, the upper end of 25 the lower breaking jaw that a strong projecting said gap being of suitable size to cause the larger movement and consequently a considerable free ing from load of the breaking mouth is produced lumps to be ‘crushed in the upper end of the in the lower zone. This movement of projection gap, and the shape of said gap and the gradually will not be set up in the upper part of the break; increasing inclination of the face of said lower ing gap owing to the sllghter inclination of this jaw being so related that the material is crushed part of the breaking surface,‘ but the material on progressively as it moves down the gap and the this part of the breaking surface will only be quantity of crushed material and the convey delivery gap is so considerable owing to the in creasing inclination of the breaking surface of moved forward slightly and at the same time in- ' ance of the material in all zones of the gap are tensely broken, so that the breaker can work 35 without any special quantitative apportioning of substantially adapted to one another. KARL MEISTER.