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A leak-proof assembly for mounting an air horn on a truck cab roof. The mounting includes a threaded portion extending through the roof, a flange extending circumferentially around the fitting, and a horn stud portion. Concentric seals, adjacent the threaded portion provide a redundant water-tight c

A leak-proof assembly for mounting an air horn on a truck cab roof. The mounting includes a threaded portion extending through the roof, a flange extending circumferentially around the fitting, and a horn stud portion. Concentric seals, adjacent the threaded portion provide a redundant water-tight compression seal against the roof. A nut is mounted on the threaded portion and also includes an o-ring. Upon tightening, the two concentric seals provide leak proof seals around the hole defined by the body panel. The mounting defines an internal air passage so that the horn can be operated by a source of compressed air attached to the threaded portion from the vehicle interior.

대표청구항 ▼

A leak-proof assembly for mounting an air horn on a truck cab roof. The mounting includes a threaded portion extending through the roof, a flange extending circumferentially around the fitting, and a horn stud portion. Concentric seals, adjacent the threaded portion provide a redundant water-tight c

A leak-proof assembly for mounting an air horn on a truck cab roof. The mounting includes a threaded portion extending through the roof, a flange extending circumferentially around the fitting, and a horn stud portion. Concentric seals, adjacent the threaded portion provide a redundant water-tight compression seal against the roof. A nut is mounted on the threaded portion and also includes an o-ring. Upon tightening, the two concentric seals provide leak proof seals around the hole defined by the body panel. The mounting defines an internal air passage so that the horn can be operated by a source of compressed air attached to the threaded portion from the vehicle interior. irst and second members. 10. The adjustable pedal assembly according to claim 9, wherein the first and second cam surfaces are formed by peripheral edges of the first and second members. 11. The adjustable pedal assembly according to claim 1, wherein the upper arm is a generally planar member. 12. The adjustable pedal assembly according to claim 11, wherein the first and second camming surfaces are formed by peripheral edges of the member. 13. The adjustable pedal assembly according to claim 12, wherein the first camming surface is formed by a top edge of the member and the second camming surface is formed by a rearward edge of the member. 14. The adjustable pedal assembly according to claim 12, wherein the first camming surface is formed by a top edge of the member and the second camming surface is formed by a forward edge of the member. 15. The adjustable pedal assembly according to claim 12, wherein a third camming surface is formed by a forward edge of the member and a third cam follower is carried by the lower arm and engages the third camming surface. 16. The adjustable pedal assembly according to claim 1, wherein the first and second camming surfaces are formed by peripheral edges of the upper arm and form arcuate paths for the cam pins. 17. The adjustable pedal assembly according to claim 1, further comprising a mounting bracket and wherein the upper arm is pivotably connected to the mounting bracket by a pivot pin forming the pivot axis and the lower arm is spaced apart from the pivot pin. 18. An adjustable pedal assembly comprising, in combination: an upper arm having a pivot fixed to a mounting bracket having a pivot axis and a generally planar member forming first and second camming surfaces at a peripheral edge thereof; a lower arm having a lower end carrying a pedal and an upper end operatively connected to the upper arm for selected movement relative to the upper arm, the upper arm carrying first and second cam pins laterally extending from the lower arm and engaging the first and second camming surfaces respectively; a drive assembly operatively connected to the lower arm to selectively move the lower arm relative to the upper arm; wherein the drive assembly includes a drive screw, a drive nut which moves along the drive screw upon rotation of the screw, and a motor for selectively rotating the drive screw; wherein the first and second camming surfaces are formed by peripheral edges of the member and form arcuate paths for the cam pins; and wherein the first and second camming surfaces and the first and second cam pins lock the upper and lower arms together for mutual rotation about the pivot axis upon application of a load to the pedal when the lower arm is at any position relative to the upper arm and the drive screw and the drive nut do not connect the upper arm and the lower arm due to failure of the drive assembly. 19. The adjustable pedal assembly according to claim 18, further comprising a mounting bracket and wherein the upper arm is pivotably connected to the mounting bracket by a pivot pin forming the pivot axis and the lower arm is spaced apart from the pivot pin. 20. An adjustable pedal assembly comprising, in combination: a mounting bracket; an upper arm having a pivot fixed to a mounting bracket having a pivot axis, the upper arm having first and second generally planar members, the first and second members being generally parallel and spaced apart, the first and second members each forming first and second camming surfaces at a peripheral edge thereof; a lower arm having a lower end carrying a pedal and an upper end operatively connected to the upper arm for selected movement relative to the upper arm, the upper arm carrying first and second cam pins laterally extending from the lower arm and engaging the first and second camming surfaces,respectively; wherein the lower arm is spaced apart from the pivot pin; a drive assembly operatively connected to the lower arm to selectively