US1795057A - Expansion shield - Google Patents

Description

March 3, 1931. c. TOMKINSON 1,795,057

EXPANSION SHIELD Filed Jan. 21. 1927 /7 /6 39 F'zgL/Z INVENTOR (/Iar [es 6. jbm/rzm'an hZWAqu W A RNEYS Patented Mar. 3, 1931 UNITED STATES" PATENT; OFFICE CHARLES C. TOMKINSON, OF PLAINFIELD, JERSEY, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO J. EDWARD OGDEN COMPANY, OF NEW YORK, N. Y., A CORPORA- TION OF NEW JERSEY EXPANSION SHIELD Application filed January 21 1927. Serial No. 162,446.

This invention relates to improvements in expansion shields of the character employed for obtaining anchorage in walls of brick, stone and cementitious material not adapted to directly receive a threaded member.

One of the objects of the invention is to provide an expansion shield so constructed and arranged as to possess superior gripping qualities.

in Another object of the invention is to provide a device of the character specified that is simple in construction, efficient in operation and can be economically manufactured.

Further objects of the invention will appear from the following specification taken in connection with the drawings, which form a part of this application, and in which Fig. 1 is an elevational view of a shield constructed in accordance with the invention;

Fig. 2 is a longitudinal sectional elevation taken substantially on line 22 of Fig. 1;

Fig. .3 is an end view of the inner end of the shield shown in Fig. 1;

Fig. 4 is a transverse sectional elevation taken substantially on line H of Fig. 2;

Fig. 5 is a longitudinal sectional elevation showing the shield expanded in a wall opening; and

Fig. 6 is a sectional elevation similar to Fig. 2, but illustrating another embodiment of the invention.

The invention briefly described consists of an expansion shield formed of material of uniform thickness, such as sheet metal, and having expansible portions provided with an annular projection adapted to be forced Outwardly by the expanding element into gripping engagement with the wall opening. In the particular form of the invention illusr trated, the shield has reversed annular channels, one channel extending outwardly to form a projection and the other channel extending in the opposite direction. Further details of the invention will appear from the following description.

In the particular embodiment of the invention illustrated in Figs. 1 to 5 inclusive, the shield comprises a pair of sections 10 and 11,

u preferably formed of metal of uniform thickness, such as sheet metal. The two sections 1 cylindrical in shape.

treme inner end of the shield is bent inwardly as shown at to enclose the expanding element or nut 21 which is normally disposed in the position shown in Fig. 2. The nut 21 has a tapered outer surface 22 conforming in inclination to the inclination of the tapered end portion 17 of the shield and it will be noted that the nut in its normal position extends beneath or to a position within the projection 16.

The tapered portion 17 of the shield is provided with diametrically opposed slots 25 which receive oppositely projecting lugs 26 formed on or carried by the nut 21. The engagement of the lugs 26 in the slots prevents the nut from turning when it is drawn longitudinally in the shield by a bolt 28 or other expanding member. The two sections of the shield are held together by an annular split ring 29. The outer end of the shield is preferably flanged as shown at 30.

The operation of the shield is clearly illustrated in Fig. 5 and it will be seen that as the expanding element or nut 21 is drawn longitudinally in the shield, the expansible portions of the shield will be forced outwardly and the annular projection 16 will be pressed into firm gripping engagement with the wall opening.

In the embodiment of the invention illustrated in Fig. 6, the shield has an annular proj ection and a tapered end portion 36. The expanding element 37 for the shield has two tapered portions 38 and 39. When the expanding element or nut 37 is drawn longitudinally in the shield, the tapered portion 38 will engage the shoulder 40 at the outer end of the annular projection 35 and the tapered portion 39 will engage the tapered end portion 36 of the shield.

From the foregoing description it will be seen that a simple and practical form of shield has been designed and this shield will form a firm and secure anchorage.

Although certain specific embodiments of the invention have been particularly shown and described, it will be understood that the V invention is capable of modification and that changes in the construction and in the arrangement of the various cooperating parts maybe made without departingfro'm'the spirit or scope of the invention, as expressed in the following claim.

What I claim is: V I In combination, an expansion shield formed of metal of uniform thickness and having tapered expansible portions provided with an external annular projection, sur- 7 rounding the tapered portions, an expanding element movable longitudinally in the shield within said annular projection, and means for holding said expanding element from rotation as said element moves longitudinally in the shield.

i In Witness whereof, I have hereunto set my hand this 17th day of January, 1927.. V

. 7 CHARLES C. TOMKINSON.

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