Flush-face elevator door

Claim 1

A method of making a flush-face freight elevator door which is essentially free of ''''oil canning'''' comprises welding a frame to a flat metal face plate, said face plate having a thickness between about 0.090 and about 0.1345 inches, said frame comprising a rectangle formed of metal angle, one flange of which extends substantially parallel with the wall of an elevator shaft and the other flange of which extends inwardly into the shaft, a pair of vertical reinforcer members within said rectangle, being affixed at the ends of said horizontal members of said rectangle, and horizontal stiffener members affixed between all four vertical members, said welding being carried out in the following order: a. spot weld one vertical member of said rectangle to said face plate; b. spot weld the vertical reinforcer member adjacent to said welded vertical member to said face plate; c. spot weld the second vertical reinforcer member to said face plate; d. spot weld the second vertical member of said rectangle to said face plate; e. spot weld the center portions of both of the horizontal members of said rectangle to said face plate; f. arc weld ends of both vertical reinforcer members to said horizontal members of said rectangle; g. spot weld one end portion of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent vertical members of said rectangle at corners; h. spot weld the other end portion of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent vertical member of said rectangle at corners; i. arc weld center horizontal stiffener to vertical reinforcer members, and spot weld said horizontal stiffener to said face plate; j. arc weld one end horizontal stiffener between the corresponding vertical reinforcer member and the adjacent vertical member of said rectangle and spot weld said horizontal stiffener to said face plate; and k. arc weld the other end horizontal stiffener between the other vertical reinforcer member and the adjacent vertical member of said rectangle and tack weld said horizontal stiffener to said face plate.

Claim 2

A method of making a flush-face freight elevator door which is essentially free of ''''oil canning'''' comprises welding a frame to a flat metal face plate, said face plate having a thickness between about 0.090 and about 0.1345 inches, said frame comprising a rectangle formed of metal angle, one flange of which extends substantially parallel with the wall of an elevator shaft and the other flange of which extends inwardly into the shaft, a pair of vertical reinforcer members within said rectangle, being affixed at the ends of said horizontal members of said rectangle, and horizontal stiffener members affixed between all four vertical members, said welding being carried out in the following order: a. spot weld one vertical member of said rectangle to said face plate; b. spot weld the vertical reinforcer member adjacent to said welded vertical member to said face plate; c. spot weld the second vertical reinforcer member to said face plate; d. spot weld the second vertical member of said rectangle to said face plate; e. spot weld the center portions of both of the horizontal members of said rectangle to said face plate; f. arc weld ends of both vertical reinforcer members to said horizontal members of said rectangle; g. spot weld one end portion of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent vertical members of said rectangle at corners; h. spot weld the other end portion of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent vertical member of said rectangle at corners; i. arc weld center horizontal stiffener to vertical reinforcer members, and spot weld said horizontal stiffener to said face plate; j. arc weld one end horizontal stiffener between the corresponding vertical reinforcer member and the adjacent vertical member of said rectangle and spot weld said horizontal stiffener to said face plate; and k. arc weld the other end horizontal stiffener between the other vertical reinforcer member and the adjacent vertical member of said rectangle and tack weld said horizontal stiffener to said face plate.

Claim 8

A method of making a flush-face freight elevator door which is essentially free of ''''oil canning'''' comprises welding a frame to a flat metal face plate, said face plate having a thickness between about 0.090 and 0.1345 inches, said frame comprising a rectangle formed of metal angle, one flange of which extends substantially parallel with the wAll of an elevator shaft and the other flange of which extends inwardly into the shaft, a plurality of pairs of vertical reinforcer members within said rectangle, being affixed at the ends to said horizontal members of said rectangle, and horizontal stiffener members affixed between all vertical members, said welding being carried out in the following order: a. spot weld one vertical member of said rectangle to said face plate; b. spot weld the first vertical reinforcer member of all pairs to said face plate, starting with the vertical reinforcers closest to the vertical member of said rectangle welded in step a; c. spot weld the second vertical reinforcer member of each pair to said face plate starting with the vertical member closest to the center of said door; d. spot weld the second vertical member of said rectangle to said face plate; e. spot weld the center portions of both of the horizontal members of said rectangle to said face plate; f. arc weld ends of the central pair of vertical reinforcer members to said horizontal members of said rectangle; g. spot weld intermediate portions of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent pairs of reinforcer members; h. spot weld the end portions of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent vertical members of said rectangle at corners; i. arc weld center horizontal stiffeners between all vertical reinforcer members, and spot weld said horizontal stiffeners to said face plate, starting with the central horizontal stiffener; and j. arc weld the end horizontal stiffeners between the corresponding vertical reinforcer members and the adjacent vertical members of said rectangle and spot weld said horizontal stiffeners to said face plate.

Claim 9

A method of making a flush-face freight elevator door which is essentially free of ''''oil canning'''' comprises welding a frame to a flat metal face plate, said face plate having a thickness between about 0.090 and 0.1345 inches, said frame comprising a rectangle formed of metal angle, one flange of which extends substantially parallel with the wAll of an elevator shaft and the other flange of which extends inwardly into the shaft, a plurality of pairs of vertical reinforcer members within said rectangle, being affixed at the ends to said horizontal members of said rectangle, and horizontal stiffener members affixed between all vertical members, said welding being carried out in the following order: a. spot weld one vertical member of said rectangle to said face plate; b. spot weld the first vertical reinforcer member of all pairs to said face plate, starting with the vertical reinforcers closest to the vertical member of said rectangle welded in step a; c. spot weld the second vertical reinforcer member of each pair to said face plate starting with the vertical member closest to the center of said door; d. spot weld the second vertical member of said rectangle to said face plate; e. spot weld the center portions of both of the horizontal members of said rectangle to said face plate; f. arc weld ends of the central pair of vertical reinforcer members to said horizontal members of said rectangle; g. spot weld intermediate portions of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent pairs of reinforcer members; h. spot weld the end portions of both horizontal members of said rectangle to said face plate, and arc weld ends of said horizontal members to the adjacent vertical members of said rectangle at corners; i. arc weld center horizontal stiffeners between all vertical reinforcer members, and spot weld said horizontal stiffeners to said face plate, starting with the central horizontal stiffener; and j. arc weld the end horizontal stiffeners between the corresponding vertical reinforcer members and the adjacent vertical members of said rectangle and spot weld said horizontal stiffeners to said face plate.