US2944308A

US2944308A - Apparatus for filling and ramming foundry flasks

Info

Publication number: US2944308A
Application number: US670539A
Authority: US
Inventors: Beech Austin Sidney
Original assignee: Foundry Equipment Ltd
Current assignee: Foundry Equipment Ltd
Priority date: 1956-07-12
Filing date: 1957-07-08
Publication date: 1960-07-12
Anticipated expiration: 1977-07-12
Also published as: FR1178719A; CH350764A; BE559183A

Description

y 2, 1960 A. s. BEECH 2,944,308

APPARATUS FOR FILLING AND RAMMING FOUNDRY FLASKS Filed July 8.' 1957 APPARATUS FOR FILLING AND RAMMING FOUNDRY FLASKS Austin Sidney Beech, Leighton Buz zard, England, assignorto Foundry Equipment Limited, Leighton Buzzard, England, a British company Filed July 8, 1957, Ser. No. 670,539 Claims priority, application Great Beam July, 12, 1956 4 Claims. on. 22-36) This invention comprises improvements in or relating to apparatus for filling'and ramming foundry flasks.

The invention consists in a modification of the invention claimed in our United States Patent No. 2,568,536, According to that patent a ramming head for projecting said into flasks comprises a circular casing, a coaxial rotor therein and at least one impeller blade carried by the rotor the root part of the blade, or of each blade, being clamped to the rotor by releasable clamping means, the operative part projecting outwardly therefrom towards the circular periphery of the casing, the clamping means being such that the blade is adjustable lengthwise to compensate for wear of the free end of the operative rates stem anti-clockwise. The impeller head 15 has' a back flange 20 which rotates close to the back wall 21 of the casing 11 and carries a cylindrical flange 22 enclosing the roots of the ramming blades 16. The flange 22 is slotted to pass the blades 16 andits front edge is close to the front door 13 when the latter is closed.

' 25 bent up on one side.

part of the blade, the casing being provided with a lateral inlet for sand close beside the pathof the operative part of the blade or blades and with a peripheral outlet. l,

The impeller blades specifically described and as claimed in claim 6 of the said patent slope backwardly with respect to the direction of motion of the rotor.

According to the present invention, where such backwardly sloping blades are employed, the tips of the blades are curved or bent forwardly, preferably to such an extent that the direction of the face of the blade at the tip is radial to the axis of the impeller. It is found that this materially increases the efficiency of the ramming blades. The preferred section of the blades and the general arrangement of the parts may be such as is described in the aforesaid patent specification No. 2,568,- 536.

Preferably the blades are bent forwardly at a position which is at some distance from the end of the blade so that as each blade wears away in use and has to be adjusted radially outwards relative to the rotor on which it is mounted, it retains the forward slope of the tip practically for its whole life.

Certain constructions in accordance with the present invention will now be described, with reference to the accompanying drawings, in which:

Figure 1 is a front elevation of a ramming head, with door open to show the interior; 1

Figure 2 is a side elevation of a blade, removed from the head;

Figure 3 is a plan of the same;

Figure 4 is an end elevation of the same, looking at the blade from the left of Figure 2, to a larger scale;

Figure 5 is a side elevation of a modification;

Figure 6 is a plan of the same; and

Figure 7 is a section upon the line 7-7 of Figure 5, looking in the direction of the arrows.

Referring to Figure l, the ramming head comprises a casing 11, lined with abrasion-resistant material 12. The

casing is short and cylindrical, with a horizontal axis and a hinged front door 13, kept shut in use. Concentric with the casing is a shaft 14 on which is mounted an impeiling head 15 having flat faces to which are secured ramming blades 16 by set screws 17. The head has an inlet chute 18' for moulding sand and a tangential Outlet 19. The direction of rotation of the head 15 is The blades 16 are shapedas shown in'Figures 24 and each comprises a fiat root-portion 23 to fit on one of the fiat'faces of the head 15 and slotted at 24 to pass the set-screw 17. The blade has a sharp knife-shaped edge This edge passes close in front of the inlet-chute 18. The other edge 26 is curved up but not sharpened. The outer end portion of the blade is curved forwardly as shown at 27 so that although the root 23' is sloped rearwardly in relation to the direction of rotation the end portion is'radial, i.e.' at right angles to the pheriphery of the casing 11, as clearly, seen in Figure l. The root 23 carries a tail 28, bent down at 29 and pierced at 30 (Figure 4) to pass a screwed positioning stud 31, which carries units, 32, 33. By loosening set screw 17 and adjusting units 32, 33, the blade can be set so that in rotation it just clears the lining 12 of casing 11, and can be locked in place by tightening gset-screw 17 again.

the-head in the form of a series of wads of sand which.

ram themselves down firmly ina foundry mould located below the head. The forward curve 27 of the blades is formed greatlyto assist the efficiency of this action.

The sand, being highly abrasive, wears the exposed parts of the blades away, especially at the tip. As wear occurs, the blades are adjusted outwards from time to time by nuts 32, 33 to keep their tips close to the lining 12. Although this makes the ends of the blades come a little further back from the position shown in the drawings, considered relative to the direction of rotation, it does not, with reasonable proportions, as shown, seriously alter the angle of the tip of the blade relatively to the lining so long as part of the forwardly curved portion of the blade remains. When this is gone the blade should be renewed.

Figures 5, 6 and 7 show a similar blade but the forwardly bent portion 34 beyond the bend 27 is shorter. This Works quite well and illustrates how, even when working the shape of Figures 2 to 4 remains effective.

I claim:

1. A ramming head for projecting sand into flasks -c0mprising a circular casing, a coaxial rotor therein, a

plurality of substantially straight, narrow, channel-shaped impeller blades each of uniform cross-section through its entire length and having an operative part and a straight inoperative root part carried by the rotor, the root part ofthe blade being clamped within the rotor by releasable clamping means, the operative part projecting outwardly from the rotor towards the circular periphery of the easing, the clamping means being such that the blade is adjustable lengthwise to compensate for .wear of the free end of the operative part of the blade, the impeller blade being mounted on the rotor so that the straight root part slopes backwardly with respect to the direction of movement and the tip of the blade being curved forwardly so as to be radial to the axis of the impeller, the casing being provided with a lateral inlet for sand close beside the path of the operative part of the blade and with a peripheral outlet.

2. A ramming head for projecting sand into flasks comprising a circular casing, a coaxial rotor therein, a plurality of substantially straight, narrow channel-shaped impeller blades each of uniform cross-section throughout its entire length and having a straight fiat root portion pe a ef-. e e hta. h amp n me he ein h h.

h t e hl sl f a ihet le h i to ee pe e tee eae e ree. n f; he hetetive; p r t he r lade the impeller blade being mounted; orga seat within the 10; e he he r ight EQQFPQYI eit ahae y with ee e t to t ed-. he. t he: heal and he t nt 9f; the ade; h e e e e w rdlw so as e e subs an ial ll/419?; l hee ha d' tt e e hahe haat v tie w h e ateral: et or e e eee eeide the P rt Q he pe e: p t.

ef lade nt wi h he h t h l tt 3- A hlede e e rehnduc ehs r ihe he i in e e rew ra h fla wet P9 5 2 ee i ew tions curving up from the root portion, one of; the said ide p tions a n ehe pnif ehehe a ed e he a e having aforwardly curved tip. portion, said root portioncarrying, at the opposite end from said: tip portion a; tail portion bent and pierced to re eive, an adjusting stud 4. A ramming head for projecting; moulding sand intov flasks comprising in combination a circular casing having an; inlet in one side close to the outer part of. the

casing and a peripheral outlet, a hollow rotor coaxial t he ea in and. ha n ts hellew ntet szt aeeeae h e from one side, a plurality of impeller blades on the rotor, each said impeller blade being of rectilinear channel-like form in cross-section and being substantially straight longitudinally and having a forwardly curved tip portion, said rotor being slotted in its periphery to lit the blade and enable itto enter-"theinterior of the rotor but project therefrom toward the periphery of the casing, and a seat- 18: fe db a within o o a d dampin neana vyi.tl:,1- in the hollow, partof; the rotor to hold said blade on said seating, the seating and the portion, of the. blade supported therebybeing tangential to a circle within the rotor, the flanges of the channel blade projecting forwardly in the direction oi the rotation; of the r0t 0,r:, the blade sloping rearwardly with reference to a radius of said circle and the tip of-the blade bending forwardly so as to lie at right angles with respect to the periphery of thecasing.

References Cited in the file of, this patent UNITED STATES PATENTS