LINKAGE MECHANISM BETWEEN STRUCTURAL MEMBERS

Abstract: A connecting linkage is provided between two structural members which includes a pinned connection to allow rotation of one structural member with respect to the other and which permits adjustment and alignment before locking the device in position without the need for drilling a precisely positioned hole for the pin in the structural member. An oversized hole is formed in one of the structural members and the pin is placed through the hole. A first support plate having pin-sized holes is then placed over each end of the pin followed by a second pair of support plates are having pin-sized holes. The assembly is then moved with respect to the first structural member as permitted by the oversized hole around the pin into a desired position. The second pair of support plates are then welded to the second structural member and the first pair of support plates are welded to the first structural member. If desired, the pin may be welded to the second pair of support plates. The first pair of support plates and the first structural member are free to rotate about the pin and with respect to the second pair of support plates and the second structural member.

Description: Linkage Mechanism Between Structural Members Background of the Invention The present invention relates to a pinned connection between structural members permitting rotation of the members around the pin and particularly to an arrangement which permits easy assembly and adjustment. In many situations, it is desirable to provide a pinned connection between structural members so as to permit slight rotations of one member with respect to the other member. An example would be where some flexibility is desired or where thermal expansion must be accommodated. A specific example is between the vertical support columns and the horizontal radial support beams in a large rotary regenerative air preheater. The problem that is encountered in assembling these structural members is that the precisely drilled holes for the pins in the members and the connecting linkage devices rarely align making assembly very difficult. Summary of the Invention A connecting linkage is provided between two structural members which includes a pinned connection to allow rotation and which permits adjustment and alignment before locking in position. More specifically, the connecting linkage includes a first pair of members having holes therein for the pin to be attached to one of the structural members, a second pair of intermediate members also having holes therein for the pin which will be attached on opposite sides of the other structural member and an oversized hole in the other structural member to permit assembly and adjustment before locking the first and second pairs of members to the respective structural members. A further aspect of the invention permits the structural members to be skewed with respect to each other. Brief Description of the Drawings Figure 1 is a cross section view of one beam connection to another beam, column or base according to the present invention. Figure 2 is a modified embodiment of the present invention adapted to accommodate skewing between members. Description of the Preferred Embodiments The drawings generally show two structural members attached together according to the present invention. When referring to structural members, these include various combinations of columns, beams and even base plates or platforms on the ground or floor. It is only limited to the connection of one item to another through a pinned connection. Figure 1 is illustrative of the present invention and involves the connection of one structural member 1 2, which could be the top view of a vertical column, shown as an I-beam , to another structural member 14, which could be a horizontal beam, also shown as an I-beam with the web 1 6. It is desired to connect the two members together with the pin 1 8 but it is not always known exactly where the hole for the pin 1 8 should be located in the web 1 6 of the I-beam 14. Therefore, according to the present invention, the web 1 6 of the i-beam 14 has an oversized hole 20 formed for the pin 1 8. The term oversized hole is used herein to mean a hole which is sufficiently larger than the pin 1 8 to permit movement of the structural member with respect to the pin to the amount required for the desired amount of adjustment. In order to attach the two structural members 12 and 14 together, the pin 1 8 is first inserted through the oversized hole 20 in the web 1 6. Next, the two intermediate members or plates 22 with pin-sized holes 24 are placed over the pin 18, one on each side of the web 1 6. Pin-sized holes means which are just large enough to permit assembly over the pin but small enough to essentially prevent movement. The two outside members or plates 26 with pin-sized holes 28 are then placed on the pin 18 again with one on each side of the web 1 6. Since the pin 1 8 is through the oversize hole 20 in the web 1 6, the entire linkage assembly of the pin 1 8, plates 22 and plates 26 can be moved with respect to the beam 14 into the proper position for attachment to the column 1 2. After the linkage assembly has been moved (horizontally and/or vertically) into the proper position, the two outside members 26 are attached to the column 1 2 such as by the welds 30. That attachment fixes the pin 1 8 with respect to the column 1 2. Next, the intermediate plates 22 are attached to the web 1 6 of the beam 14 such as by the welds 32. That rotatably fixes the beam 14 to the pin 1 8. Therefore, the beam 14 is now rotatably fixed to the column 1 2 through the pin 1 8. If desired, the pin may be secured to the outside plates 26 by the welds 34 to hold the pin in place. Another embodiment of the present invention is shown in Figure 2 and involves the attachment made between a column 36 which is skewed with respect to the beam 38 to be attached to the column. The skew of the column 36 is shown by the center line 40 through the pin 1 8 and the parallel line 42 at the bottom of the column 36 thereby illustrating a skew of angle θ. In this embodiment, the same components including the outside plates 26, the intermediate plates 22, the pin 1 8 and the oversize hole 20 in the web of the column 36 are employed except that the surfaces 44 on the intermediate plates 22 are tapered at the angle θ to accommodate the skewing.

Claims: In the Claims: 1 . A connecting linkage between first and second structural members which permits rotation of said structural members with respect to each other comprising: a. said first structural member having a portion with an oversized hole therethrough; b. a cylindrical pin extending through said oversized hole; c. a first pair of support plates, each having pin-sized holes therethrough and with one attached on each side of said portion of said first structural member with said cylindrical pin extending through said pin- sized holes therein whereby said first pair of support plates and said first structural member are rotatable with respect to said cylindrical pin; and d. a second pair of support plates each having pin- sized holes therethrough and with one adjacent each of said first pair with said cylindrical pin extending through said pin sized holes therein and attached to said second structural member whereby said first pair of support plates and said first structural member are rotatable with respect to said second pair of support plates and said second structural member. 2. A connecting linkage as recited in claim 1 wherein said cylindrical pin is fixed to said second pair of support plates. 3. A method of assembling a connecting linkage between first and second structural members comprising the steps of: a. providing an oversized hole in a portion of said first structural member; b. inserting a cylindrical pin through said oversized hole; c. placing a pair of first support plates having pin-sized holes therethrough on said cylindrical pin, one on each side of said portion of said first structural member; d. placing a pair of second support plates having pin- sized holes therethrough on said cylindrical pin, one on each side of said portion of said first structural member and adjacent to the respective first support plate; e. moving said first and second support plates and said cylindrical pin into a selected proper support position; f . attaching said first pair of support plates to said first structural member and said second pair of support plates to said second structural member.

Inventors: O'BOYLE KEVIN JAMES, O'BOYLE, KEVIN, JAMES
Applicants: AIR PREHEATER ABB, ABB AIR PREHEATER, INC.
Application year: 1996
Main classification: F16B7
IPC codes: E04B1, F16B5, F16B7, F28D19