US1864210A - Turtle back reenforcing casting for dipper doors - Google Patents

Description

June 2l, D H MEYER TURTLE BACK REENFORCING CASTING FOR DIPPER DOORS Filed Oct. 4, 1929 @o O mi O i lfb (o Patented June 2l, 1932 UNITED STATES PATENT OFFICE DANIEL H. MEYER, OF ELKVVILLE, ILLINOIS,

ASSIGNOR T AMERICAN MANGANESE TURTLE BACK REENFORCING CASTING FOR DIPPER DOORS Application -led October 4, 1929. Serial No. 397,879.

This invention relates to improvements in the construction of dipper doors, more particularly to the design of a reenforcing casting which may be attached to the excavating dipper to render it more vulnerable under impact of heavy rocks which the dipper may handle in use.

The ordinary construction of an excavating dipper comprises a front to which is attached removable dipper teeth and to which is rigidly secured a dipper back having connections for handling the dipper. A' discharge door is generally pivoted to the back of the dipper and serves to retain the material in the dipper as itis moved to the place of delivery. Excavating di ppers are sometimes employed for handling large, heavy rocks and the discharge door will receive the impact of the rocks as they are loaded in the dipper. There is therefore a tendency for the door to wear out at its center portion.

It is an object of the present invention to improve upon the design of the door and to provide a stronger construction which will give longer life in use than present forms.

It is further an object of the present invention to form the surface of the door which faces towards the interior of the dipper in an arched formation, symmetrical with respect to two axes of the dipper door.

An additional object of the present invention resides in the construction of a 'turtle back reinforcing casting which may be applied to the door of existing dipper designs and will provide a stronger constructionV which will resist wear under rocks handled by the dipper.

Further objects of the present invention will be more readily apparent as the description proceeds in connection with the attached drawing in which:

Figure 1 is a transverse section through an excavating dipper showing the door elevation;

Figure 2 is a plan view of the eenforcing casting which is designed to be attached to the inner surface of the dipper door;

Figure 3 is a longitudinal section on the plane indicated hy 3er-3a: in Figure 2;

Figure 4 is a section taken transverse to impact of heavy door of an the plane of the section shown in Figure 3 along the line indicated 4w-4w in Figure 2.

In the drawing: l

Figure 1 illustrates the ordinary construction of an excavating dipper comprising a dipper frontl() having secured thereto by the rivets 11 a dipper back ll-a. The-forward edge of the dipper front has removably attached thereto dipper teeth 12 in the customary manner. The dipper back 11--a has formed therewith integral pivots 13 whereby the dipper stick may be connected to handle the dipper. has an integral connecting pivot 14 serving as a connection by pivot pin 15 with'the arm 16 carrying a dipper door 17. Suitable latching means are provided as at 18 for holding the door in closed position. It is general practice to form the dipper door 17 having a plane interior surface and it will be apparent that when the dipper is used for handling heav rocks that the impact of the rocks will be )orne primarily at the center portion of the dipper door.

It is the purpose of this invention to reenforce the construction of the dipperdoor and a desirable manner consists in forming the interior surface of the dipper door in a symmetrically arched shape such as shown by the surface 19. Thus, the interior surface of the door will have substantially a turtle back shape and the impact pressures of the rocks upon the center portion of the door Will be transmitted towards the edges thereof in lateral directions. It is of course apparent that the turtle back surface could be formed integrally with the door but a preferred construction consists in the provision of an integral casting which may be attached to the doors of existing dippers to obtain the desired improvements.

Therefore, I have shown in Figure 2 a plan view of an integral casting 20. The casting 20 is generally of elliptical shape in plan view and is arched along a longitudinal axis in Figure 3 and along a transverse axis asl `shown in Figure 4. A continuous edge 21 having a iattened lower surface is formed around the casting whereby the edge 21 will atly seat on the plane surface of the dipper The dipper back also ,i

door 17. As shown in Figures 2, 3 and 4 rivet receiving openings 22 are provided at spaced points around the edge 21 of the reenforcing casting .20 whereby the casting 5 may be rigidly riveted to the dipper door 17.

In order to further strengthen the arched casting 2O a longitudinal rib 23 is provided `on the lower surface of the casting and joins with a transverse rib 24. The ribs 23 and 24 are substantially T-shaped whereby Hanges 25 and 26 are provided in the plane of the ed e 21 of the casting.

t will be apparent that reenforcing casting such as illustrated may be readlly designed to fit any of the customary shal es of dipper doors and will rovide great y increased strength and resist wear of the door under the impact action of .avy materials handled by the dipper.

Various changes and modifications may be `resorted to without departingfrom the spirit v of my invention as expressed in the appended claims.

I claim:

1. In excavating dipper construction, a dipper door and a renewable reenforcing casting secured to and substantially covering the inner surface of the dipper door.

-2. In excavating dipper construction a dipper door and a renewable reenforcing casting 'secured to the inner surfacel of the dipper door, said reinforcing casting being of arched. formation.

Y, `3. In an excavating dipper a dipper door and a renewable ieeinfol'cin castin secured to the inner surface of said dipper oor, said reinforcing casting being of arched formation about two axes in the plane of the door.

4. A renewable reenforcin casting adapt- 40 ed to be secured to a dip er oor, the impact receivinff surface of said casting being of arched faormation and integral ribs disposed on the under surface of said casting.

5. A renewable reenforcingcasting adapted to be secured to a dipper door, said casting i being of arched formation symmetrically above a longitudinal and a transverse axis, said casting also including integral ribs disposed beneath the arched surface.

Signed at Elkville, Illinois, this 25th day of September, 1929.

DANIEL H. MEYER.

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