US2137538A - Process of die casting and assembling expansion shields - Google Patents

Description

' Nov. 22, 1938. R MHNTOSH 2,137,538

PROCESS OF DIE CASTING AND ASSEMBLING EXPANSION SHIELDS Fil ed Jan. 7, 1957 2 Sheets-Sheet 1 INVENTOR Fey 5. McIntosh ATTORNEYS Nov. 22, 1938. R. E. MclN os 2,137,538

PROCESS OF DIE CASTING AND ASSEMBLING EXPANSION SHIELDS Filed Jan. 7, 1937 2 Sheets-Sheet 2 2/ 36 an sa 52 ga ii iiii1;::=:

INVENTOR Roy E. Mcfnfash ATTORNEYS Patented Nov. 22, 1938 UNITED STATES PATENT OFFICE PROCESS OF DIE CASTING AND ASSEM- BLING EXPANSION SHIELDS Roy E. McIntosh, New York, N. Star Expansion Bolt Company,

Y., assignor to New York, N. Y.,

Claims.

This invention relates to a process of die casting and assembling expansion shields or anchors.

' One type of anchor, such as that illustrated in Patent No. 1,695,303, granted December 18, 1928,

5 comprises an outer element or sleeve of soft or ductile metal and an inner expanding element of harder metal having tapered or wedge portions arranged to be forced or drawn into the sleeve,

whereby the sleeve is expanded laterally into engagement with the wall of the opening in which the anchor is positioned.

' The sleeve and expanding element are now cast separately in .poured molds and are then assembled.

This invention has for its salient object to simplify the making and assembling of anchor units of the character described, thereby cutting down on the number of operations now required for the manufacture of such anchors.

Another object of the invention is to provide a simple, practical and eflicient process or method of economically manufacturing anchors of the type described.

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 a top plan view of a group of die cast interconnected expanding units for a bolt anchor;

Fig. 2 is a side elevation of the structure shown in Fig. 1, one of the expanding elements and the adjacent portions of the casing and sprue being shown in section;

Fig. 3 is a top plan view similar to Fig. but showing the casting of the group of soft metal sleeves or expansible units interconnected by the sprue and adjacent portions of the casing;

Fig. 4 is a view similar to Fig. 2 and is a side elevation of the structure shown in Fig. 3, one of the units and the adjacent portions of the sprue and casting being shown in section;

Fig. 5 is an elevational view showing the castings illustrated in Figs. 2 and 4 in assembled relation;

Fig. 6 is an enlarged sectional elevation of one of the expanding elements disposed in one of the soft metal sleeves, these parts being shown in the relative position taken when the two castings are assembled, as shown in Fig. 5;

Fig. 7 is a view similar to Fig. 5, but showing the position taken by the two castings and anchor units after the expanding elements have been forced into the expansible elements by pressure between two die members;

Fig. 8 is a view similar to Fig. 6, but showing the relative position of the sleeves and expanding elements when these parts have been forced together to the relative position shown in Fig. 7

Fig. 9 is an elevational view of a press and 6 the two castings, the assembled castings being shown at the left in the position taken prior to the operation of the press or the depression of the plunger, and the parts being shown at the right in the position taken after the plunger has 10 pressed the expanding elements into the expansible elements and prior to the depression of the punches or plungers which force the expanding elements into the expansible elements and de tach or strip these elements from their castings; 16

Fig. 10 is a sectional elevation on an enlarged scale of the two castings and the expanding element and expansible element carried thereby in the positions shown in Fig. 9;

Fig. 1 shows the punch or plunger in de- 20 pressed position forcing the assembled unit from the forming die after the elements have been stripped from their sprues and adjacent portions of the casting; and

Fig. 12 is an elevational view of the anchor in 25 its completed form.

' The invention briefly described consists of a process comprising the following steps, namely, die casting in a group a plurality of soft metal expansible elements or sleeves, die casting in 30 a group a like number of expanding elements, preferably of harder metal and radially arranged, and conforming in arrangement and radii to the arrangement and radii of the soft metal elements or sleeves. The two castings are then as- 5 sembled with the expanding elements disposed in the expansible elements or sleeves and the assembled castings are then placed in a press by which the expanding elements are forced into the expansible elements, at the same time 40 straightening or alining the sleeves or expansible elements. The assembled castings are then placed in asecond press having punches or plungers which force the expanding elements further into the expansible elements and force these elements through trimming dies and forming dies whlchtrim or strip oil the excess metal or sprues and eject the assembled units or anchors from the forming die.

Further details of the invention will appear from the following.

The process described and claimed in this application is similar in certain respects to that described in applicants co-pending application.

119,465, filed January "I, 1987, but is patentably distinct therefrom.

In the particular embodiment of the invention illustrated, the expanding elements 20 are die cast in a group and are interconnected. This figure shows the sprue 2| having a circular portion 22 and laterally extending or radial portions 23 which are connected to the expanding elements 20. As will be understood by those familiar with the art of die casting, the casting shown in Fig. 1 is formed in a die having a gate through which the metal is forced under pressure into the die, the gate communicating with a circular groove which in turn communicates with lateral openings which lead to the mold cavities in which the elements III are cast. As shown in Fig. 2, each of the elements 20 has cast therein an internal thread 24.

The die casting shown in Figs. 3 and 4 is made in a manner similar to that described in the preceding paragraph and comprises a plurality of sleeves 25 which are connected by the adjacent portions of the casting, including an annular portion 26, laterally extending portions 21 connected thereto and a sprue 28, the parts 21, 26 and 28 all forming a portion of the sprue.

From the illustration in Figs. 1 and 3 it will be noted that the radius A of each of the elements 20 is the same as the radius B of each of the elements 25, and further, that these two groups of elements are similarly arranged and are spaced in exactly the same manner, so that the casting shown in Fig. 1 can be superposed on the casting shown in Fig. 3 in the manner illustrated in Fig. and when so superposed the expanding elements 20 will fit into the expansible elements or sleeves 25. Fig. 6 shows the relative positions of the expanding elements and sleeves and it will be noted that the expanding elements have tapered portions 29 which rest on the upper inner edges 39 of the sleeves.

When the parts have been assembled in the manner shown in Fig. 5 the assembled castings are placed on a fixed support 30 shown in Fig. 9 and a die or plunger 3! is depressed to an extent sufficient to force the expanding elements into the expansible sleeves to the position shown in Figs. 7 and 8.

During the operation described in the preceding paragraph, the sleeves will be properly straightened or alined and if desired this alinement can be accomplished before the die castings are assembled by pressing the die casting of the sleeve or of the expanding element between plane surfaces, such as the parts 3|! and ii shown in Fig. 9.

After the two castings have been assembled in the manner shown in Fig. '7, the assembled castings are transferred to the portion of the press shown at the right in Fig. 9, comprising a trimming die 35, a forming die 36 and a plunger 31 having a plurality of punches 38 depending therefrom and arranged to engage the upper ends of the expanding elements 20.

The operation performed by the punches and trimming and forming dies, is illustrated in the sections shown in Figs. and 11. In Fig. 10 it will be noted that the sleeves 25 with the expanding elements disposed therein are initially supported on the upper ends of the openings in the trimming die 35. When the plunger descends the punches 38 engage the upper ends of the expanding elements and force the assembled units downwardly, stripping from the expanding elements and the sleeves the adjacent portions of the casting or the sprues by which they are connected. Furthermore, as the assembled units are forced through the forming die a the expanding elements will be pressed into the soft metal sleeves to form the anchor in its completed form shown in Figs. 11 and 12.

From the foregoing description it will be clear that a simple, practical and eftlcient process of making and assembling expansion anchor elements has been worked out and that this process will eliminate many operations now necessary in the manufacture and assembling of these elements.

Although one specific embodiment of the invention has been particularly shown and described it will be understood that the invention is not limited to the particular steps or sequence of steps outlined, but that the process may be modified and no limitations are intended other than those set forth in the appended claims.

What I claim is:

1. The process of making and assembling inner expanding elements and outer expansible elements for expansion anchors which consists of die casting a plurality of expanding elements of relatively hard metal in an interconnected group, die casting a like number of similarly arranged and similarly spaced interconnected expansible elements of relatively soft metal, inserting the group of expanding elements in the group of expansible elements while the elements of both groups are still interconnected, pressing the inner elements into the outer elements and trimming oil the excess casting metal and connecting portions of the castings.

2. The process of making and assembling inner expanding elements and outer expansible elements for expansion anchors which consists of die casting a plurality of expanding elements of relatively hard metal in an interconnected group, die casting a like number of similarly arranged and similarly spaced interconnected expansible elements of relatively soft metal, inserting the group of expanding elements in the group of expansible elements while the elements of both groups are still interconnected, pressing the inner elements into the outer elements and, during the operation, trimming off the excess casting metal and connecting portions of the castngs. 3. The process of making and assembling inner expanding elements and outer expansible elements for expansion anchors which consists of die casting a plurality of expanding elements of relatively hard metal in an interconnected group. die casting a like number of similarly arranged and similarly spaced interconnected expansible elements of relatively soft metal, straightening the expansible elements, inserting the group of expanding elements in th group of expansible elements while the elements of both groups are still interconnected, pressing the inner elements into the outer elements and trimming off the excess casting metal and connecting portions of the castings.

4. The process of making and assembling inner expanding elements and outer expansible elements for expansion anchors which consists of die casting a plurality of expanding elements of relatively hard metal in an interconnected group, die casting a like number of similarly arranged and similarly spaced interconnecting expansible sleeves of relatively soft metal, inserting the group of expanding elements in the group of expansible sleeves while the units of both groups are still interconnected, pressing the expanding elements into the expansible sleeves and trimming oi! the excess casting metal and connecting portions of the castings.

5. The process of making and assembling inner expanding elements and outer expansible elements for anchors which consists of die casting a plurality of expanding elements of relatively hard metal in an interconnected group, die cast- 10 ing a like number of similarly arranged and similarly spaced interconnected expansible elements oi relatively soft metal, inserting the group or expanding elements in the group of expansible elements while the elements of both groups are still interconnected, pressing the inner and outer elements into a. trimming die and a forming die, thus trimming of! the excess metal from the elements and forcing the inner expanding elements into the outer expansible elements.

ROY E. McINTOSH.

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