US1584842A - Automatic door opener - Google Patents

Description

May 18 1926.

1,584,842 c. A. CARLSON AUTOMATI C DOOR OPENER Filed June 16, 1924 2 Sheets-Sheet 1 gwueutoz:

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May 18, 1926.

CA. CARLSON AUTOMATIC DOOR OPENER 2 Sheets-Sheet 2 Filed June 16, 1924 the doors, being connected to the Patented May 18, 1926.

UNITED stares CARL ANTON CARLSON, 013 FORT DODGE, IOWA.

AUTOMATIC DOOR OPENER.

Application filed June 16, 1924. Serial No. 720,403.

The present invention relates generally to door operating devices, and aims to provide a' novel and improved contrivance for auto matically opening doors adapted especially for use in houses or sheds for hogs and other animals.

It is the object of the invention to provide a door opening device having novel and improved features of construction, to enhance the utility and efliciency of the device.

With the foregoing and other objects in view, which will be apparent as the description proceeds, the invention resides in the construction and arrangement of parts, as hereinafter described and claimed, it being understood that changes can be made within the scope of what is claimed, without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawings, wherein- Figure 1 is an outside elevation of the structure.

Fig. 2 is an inside elevation thereof.

Fig. 3 is a vertical section on the line 3-3 of Fig. 1, showing, in dot and dash lines, the position of the parts with the doors open.

Fig. 4: is a horizontal section on the line H of Fig. 1 showing the doors open.

Fig. 5 is a horizontal section on the line 5-5 of Fig. 1 showing a modification.

In the door construction illustrated in the drawings, the door frame comprises the posts or jambs 7 at the opposite sides of the door opening, and the wall of the building or enclosure is indicated at 8. The doors 9 are connected by hinges 10 with the posts 7 so as to swing open toward one side, and it will be obvious that the operating mechanism can be used with either single or double doors.

Suitable springs 11 are provided for swinging the doors closed. and, as shown, the springs are located at the upper ends of doors and posts.

Threads 12 and 13 are disposed at the opposite sides of the doors below the lower ends of the doors, and are connected by hinges 14 with the posts 7 at the opposite edges of the door opening, to permit said treads to be depressed, and the hinges are also arranged to enable the treads to be swung upwardly so that trash or dirt which accumulates under the treads can be cleaned away.

The operative connections between the treads and doors are duplicated for the two doors, and include levers15. fulcrumed between their ends, as at 16, tothe posts 7 at those sides of the posts opposite to the doors 9. Links 17 are connected to the upper arms of said levers and to outstanding arms 18 of plates 19 secured to the doors 9.- The links 17 pass through holes in the Wall 8, and the arms 18 serve as stops to limit the movement of the doors, as seen in Fig. 4, said arms 18 being swung adjacent to or against the wall 8 when the doors are swung at substantially right angles with the wall. The lower arms of the levers 15 are connected by chains or flexible elements 20 with the tread 12, while the upper arms of the levers 15 are connected by chains or flexible elements 21 with the tread 13, said chains being located at the side edges of the treads so as to be out of the way.

When the doors are closed by the springs 11, the arms 18 being swung away from the wall will pull the links 17 and swing the levers 15 so as to pull the chains 20 and 21 upwardly and support the treads 12 and 13 in substantially horizontal position. When the animal steps on either tread, the tread is depressed, as seen in dotted lines in Fig. 3, and the corresponding chains are pulled downwardly so as to swing the lever 15 and pull the links 17 and to swing the arms 18 toward the wall 8, thereby swinging the doors 9 open, as seen in Fig. 4. Both treads swing down so as to constitute runways to enable the animal to pass through the door opening while the doors are held open, and as soon as the animal passes from the treads, the spring 11 will return the doors and treads-to normal position. The doors are then normally held closed to exclude wind, rain, snow and the other elements from the building or enclosure, but the animals can readily pass through door opening into and out of the enclosure.

The operating devices are located above the treads beyond the opposite edges of the doors, so as not to interfere with the'passage of the animals through the door way, and to also render the operating means acthe cessible for repair or adjustment. The chains as well as the links 17 pass through openings in thewall 8, and the chains 20 and 21 being flexible will permit the treads 12 and 13 to be swung upwardly for cleaning or removing the trash or dirt that may accumulate under the treads.

A modified arrangement is shown for opening the doors 9 by the depression of the treads 12. Thus, for each door 9 there is provided a triangular link 22 connected by S-links 23 with eyes or staples 2% secured to the door and corresponding post 7, and the corresponding chain or flexible element 20 is connected to the link 22, as seen in Fig. 5, instead of passing through the wall 8 and being connected to the lever 15. lVhen the tread 12 is depressed the link 22 is pulled down, and the links 22 and 23 provide a toggle so that the downward pull on the link will break the toggle and pull the door open. The links 22 and 23 can be left in place, as seen in Figs. 1 and 3, even though the chains 20 are connected to the levers 15,

so that either manner of connection can be used.

Having thus described the invention, what is claimed as new is z A door structure comprising a wall having a door opening, a door hinged to said wall to swing into and out of said opening, a tread hinged to said wall at the lower port-ion of said opening an arm carried by said door at the hinged edge thereof and projecting toward one side from said wall and serving as a stop to limit the opening; movement of the door when said arm contacts with Said wall, a lever mounted at that side of said wall opposite to said arm, a link connecting said arm and lever, and an operative connection between said lever and tread whereby the depression of the tread swings said lever to pull said link and arm so as to swing the door open.

In testimony whereof I hereunto afiix my signature.

CAR-L ANTON CARLSON.

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