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A housing for an automatic door operator comprising a header section, a closing section and a terminal section. The header section includes two legs and a connecting leg which connects the two legs to one another. One of the two legs includes an end portion having a projection with a circular cross-

A housing for an automatic door operator comprising a header section, a closing section and a terminal section. The header section includes two legs and a connecting leg which connects the two legs to one another. One of the two legs includes an end portion having a projection with a circular cross-section and an undercut. The closing section includes another projection with a circular cross-section and an indentation at one end and the terminal section at the other end. The closing section is removably attached to the header section through the engagement of the projection of the closing section with the undercut and the engagement of the projection of the one of the two legs and the indentation. The housing serves to house mechanical and electrotechnical components for the automatic the door operator.

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A housing for an automatic door operator comprising a header section, a closing section and a terminal section. The header section includes two legs and a connecting leg which connects the two legs to one another. One of the two legs includes an end portion having a projection with a circular cross-

A housing for an automatic door operator comprising a header section, a closing section and a terminal section. The header section includes two legs and a connecting leg which connects the two legs to one another. One of the two legs includes an end portion having a projection with a circular cross-section and an undercut. The closing section includes another projection with a circular cross-section and an indentation at one end and the terminal section at the other end. The closing section is removably attached to the header section through the engagement of the projection of the closing section with the undercut and the engagement of the projection of the one of the two legs and the indentation. The housing serves to house mechanical and electrotechnical components for the automatic the door operator. of said bowl. 6. The assembly of claim 2 wherein said base defines a hollow, cylindrically shaped shaft extending between and opening onto upper and lower surfaces of said base, at least a portion of said shaft containing interior threading, a base portion of said supporting column being exteriorly threaded in conformity with the interior threading in said shaft, said base portion being removably disposed in and threadably engaging the threading of said shaft. 7. The assembly of claim 6 wherein said chamber annularly extends about said shaft. 8. The assembly of claim 1, further comprising a compressible, resilient gasket being tightly disposed in an upper interior end portion of said cap and having a diameter sized to fit closely against an interior sidewall of said cap, said gasket also defining a circular central hole therethrough through which said second pipe extends in a close but slidable relationship when said cap is loosely threaded upon said first pipe such that said gasket is in a relaxed, uncompressed state, said gasket is being adapted to tightly and non-slidably grasp said second pipe when said cap is tightly threaded ton said pipe such that said gasket is placed in a compressed state. molded circular round portions having a center which coincides with a center of the contour. 11. The carrier according to claim 10 wherein the window bolt is mounted in a window pane hole. 12. The carrier according to claim 9 wherein the retaining arms are formed as yokes on each side of the window pane wherein the connecting part is mounted free of play between the support surface and the yokes. 13. The carrier according claim 9 wherein the connecting part is formed in two parts, wherein each part includes a positive-locking element which ensures accurate positioning of the two parts with respect to each other when the two parts are brought together. 14. The carrier according to claim 13 wherein each of the positive locking elements is formed as a rectangular cog. 15. The carrier according to claim 6 wherein the contour is molded on the lower edge of the window pane. 16. The carrier according to claim 6 wherein a radius of the segment of the circle is determined by a maximum allowable angular position of the carrier with respect to the lower edge of the one of the window pane and the connecting part. relation to the circular aperture of the sight mechanism; a distal circular member attached to the distal end of the sight mechanism and having an aperture aligned in contiguous relation to the circular aperture of the sight mechanism; and the proximal circular member and the distal circular member being removable from the sight mechanism. 9. A sight apparatus comprising: a mount; a sight mechanism including a proximal end and a distal end bounding a central portion having an enlarged external girth with respect to the proximal end and the distal end, and the sight mechanism set in a position within the mount via contact with the central portion; a circular aperture passing through the proximal end, the central portion, and the distal end of the sight mechanism having a perfectly circular interior circumference and being of such a longitudinal length that a human eye can view a target through the proximal end of the sight mechanism without seeing an internal edge of the circular aperture. 10. A sight apparatus as in claim 9 in which the central portion has a slip resistant surface coating. 11. A sight apparatus as in claim 9 in which the central portion is elliptical shaped. 12. A sight apparatus as in claim 9 in which a proximal circular member is attached to the proximal end of the sight mechanism and has an aperture aligned in contiguous relation to the circular aperture of the sight mechanism, a distal circular member is attached to the distal end of the sight mechanism and has an aperture aligned in contiguous relation to the circular aperture of the sight mechanism, and the proximal circular member and the distal circular member are removable from the sight mechanism. 13. A sight apparatus as in claim 12 in which the mount includes a base and a retaining member, and the retaining member is movable to allow the sight mechanism to be removed from the mount, and the retaining member has sloped ends that permit access to the proximal circular member and the distal circular member. 14. A sight apparatus comprising: a mount having a base and a movable retaining member with open sloped ends; a sight mechanism including a proximal end and a distal end bounding an elliptical shaped central portion having an enlarged external girth with respect to the proximal end and the distal end, and the sight mechanism set in a position within the mount via contact with the central portion, and the sight mechanism being removable from the mount; a circular aperture passing through the proximal end, the central portion, and the distal end of the sight mechanism; a interchangeable proximal circular member attached to the proximal end of the sight mechanism and having an aperture aligned contiguously with the circular aperture of the sight mechanism; an interchangeable distal circular member attached to the distal end of the sight mechanism and having an aperture aligned contiguously with the circular aperture of the sight mechanism, such that the combination of the proximal circular member, the distal circular member, and the circular aperture of the sight mechanism provide a combined aperture of a length that a human eye can view a target through the proximal circular member without seeing an internal edge of the proximal circular member or the distal circular member. US-4862618, 19890900, Szabo; US-5036612, 19910800, Jennings, 042/070.08; US-5086579, 19920200, Flatley et al., 042/069.03; US-6256918, 20010700, Szabo; US-6283006, 20010900, Szabo et al.; US-6341442, 20020100, Szabo et al.