Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3303303 A
Publication typeGrant
Publication dateFeb 7, 1967
Filing dateOct 2, 1964
Priority dateOct 2, 1964
Publication numberUS 3303303 A, US 3303303A, US-A-3303303, US3303303 A, US3303303A
InventorsNorman K Miller
Original AssigneeMiller Bros
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Pneumatic safety edge for power operated door
US 3303303 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

N. K. MILLER 3,303,303 PNEUMATIC SAFETY EDGE FOR POWER OPERATED DOOR Feb. 7, 1967 Filed Oct. 2, 1964 M/M/vrm. NOR/WW M/ZMA AffO/(WEX win United States Patent 3,303,303 PNEUMATIC SAFETY EDGE FOR PUWER OPERATED DGOR Norman K. Miller, li-llavertown, Pa., assignor to Miller Brothers, Upper Darby, Pin, a partnership Filed Oct. 2, 1964, Ser. No. 401,141 Claims. (Cl. 20061.43)

The present invention relates to a safety edge of a power operated door and is concerned primarily with the elimination of electric contacts within the edge itself.

As the name implies a power operated door is ordinarily moved by an electric motor. It has long been recognized as desirable that the motor be de-energized when the door encounters some object or person in its movement. Thus, the doors have been provided with safety edges. In the past these edges have included electric contacts which when brought .into engagement by the door striking an object disables the motor.

In many places where power doors are installed the liability of an explosion is a serious factor. A good example would be in a factory which produces explosives. In such locations the possibility of the electric contacts in the safety edge creating a spark which would ignite an explosion is a serious danger.

In accordance with the present invention the electric motor which powers the door is located in a safety zone removed from the explosive hazard. Included in the circuit of a motor is a pneumatically operated switch with a piece of tubing extending from the switch to the pneumatic system on the door edge.

In the copending application of Norman K. Miller, Serial No. 341,639; filed: January 31, 1964 and entitled Pneumatic Safety Edge for Power Operated Door, there is illustrated and described a sponge rubber construction that is mounted on a door edge and which provides in effect an air chamber the capacity of which is decreased when the edge encounters an object in its path of movement to create an impulse to operate the switch.

The present invention has in view as its foremost objective the provision of a pneumatic safety edge that is highly simplified as compared to the edge of said application.

More in detail, the invention has as an object the provision of a pneumatic s'afety edge of the character indicated which includes a tube of rubber or a comparable flexible material which is enclosed in a foam rubber structure which is substantially coextensive with the door edge on which it is mounted. Such a door edge may be easily and cheaply manufactured.

In some installations, a door edge may be sufficiently wide to accommodate and require more than one of such tubes. Thus, a further object is to provide a pneumatic safety edge of the character indicated which comprises a foam rubber structure enclosing a plurality of flexible tubes which extend lengthwise of the door edge.

When a plurality of tubes is included it is of course, necessary that they be connected. Thus, another object is to provide, in a pneumatic safety edge of the type noted, a manifold which is connected to the tube ends and is in turn connected to the pneumatically operated switch. In cases where two tubes are employed, the manifold may take the form of a simple T.

Various other more detailed objects and advantages of the invention such as arise in connection with carrying out the above noted ideas in a practical embodiment will 3,303,303 Patented Feb. 7, 1967 in part become apparent and in part be hereinafter stated as the description of the invention proceeds.

The invention therefore comprises a pneumatic safety edge for power operated doors which consists essentially of a foam rubber structure in which is encased one or more flexible tubes extending lengthwise of the door edge and a tube connecting the encased tubes to a pneumati cally operated switch.

For a full and more complete understanding of the invention reference may be had to the following description and accompanying drawing, wherein:

FIGURE 1 is a diagrammatic view of a power operating door with the safety edge of this invention applied thereto.

FIGURE 2 is a horizontal section through the safety edge and a portion of the door.

FIGURE 3 is a view taken normal to the showing of FIGURE 2 and is partly in section and partly in elevation and,

FIGURE 4 is a detailed prospective illustrating the tube connection.

Referring now to the drawing and first more particularly to FIGURE 1 the wall of a building, such as an explosives factory, is indicated at 10. Slidedly mounted in the wall 10 is a door 11. The door 11 is moved by a motor represented diagrammatically at 12 in FIGURE 3. A control switch 13 is included in the circuit of the motor 12, and, in the embodiment of the invention illustrated when the switch 13 is closed the motor is disabled.

At this point it might be well to note that the door 11 is shown to be of a sliding type. The invention is equally susceptible of use on a hinged or collapsible door.

Mounted on the free edge of the door 11 is a safety edge which is referred to in its entirety by the reference character S. The safety edge S comprises a base 14 of foam rubber which takes the form of a block of rectangular formation. A second block 15 of foam rubber which may be somewhat less in thickness than the block 14 is spaced therefrom by three separating strips 16, 17, and 18, also of foam rubber. These strips 16, 17, and 18 are spaced apart and provide chambers 19 and 20 which extend lengthwise of the door edge and are substantially coextensive therewith.

Positioned in the chamber 19 is a flexible tube 21 and 'a similar flexible tube 22 is positioned in the tube 29. Tubes 22 and 21 may be of rubber or a comparable material that is air impervious and has the required property of flexibility.

At one end, preferably the bottom, each of the tubes is closed, the closed ends being repersented at 23. A manifold is applied to the other end of the tubes which in this instance is the upper end. This manifold takes the form of a simple T having a cross head 25 and a stem 26. From the stem 26 another tube 27 extends to the pneumatically operated switch 13.

The blocks 14 and 15 and outer strips 16 and 18 are enclosed by an air impervious lining 28 which may be of vinyl or any suitable plastic and the lining 28 is in turn enclosed by a fabric casing 29.

The lining 23 and fabric 29 are continued out at one side to provide an attaching flap 30 that is employed in mounting the edge S on the door 11.

The operation of the above described safety edge is believed to be obvious from the illustration of the drawing and description of the parts given. However, it may be briefly outlined by noting that when the edge S encounters an object in the path of movement of the door 11, one or both of the tubes 21 and 22 will be deformed to decrease their volumetric content. This results in an increase of pressure of air within the tubes which is translated into an impulse which is transmitted through the tube 27 to the switch 13. When the latter is because various modifications of these details may be provided in putting the invention into practice within the purview of the appended claims.

What is claimed is:

1. In combination, a door, an electric motor for operating the door, a pneumatically controlled switch remote from the door and electrically connected to the motor, an elongate foam-rubber structure extending along and projecting from the closing edge of the door, said structure having a longitudinally extending internal chamber substantially coextensive therewith, a first tube of air-impervious flexible material having one end closed and disposed longitudinally within said chamber substantially coextensive therewith, said tube being configured for snug conforming engagement in said chamber and held by the walls thereof against displacement in said chamber while being deformable under pressure deforming said structure, a second tube of air-impervious material connected in fluid communication between the other end of said first tube and said switch to transmit a fluid-pressure impulse therebetween and operate said switch.

2. The combination according to claim 1, said struc ture having a second internal chamber extending longitudinally of and spaced from said first-mentioned chamber, an internal foam-rubber Wall separating said first and second chambers, a third tube of air-impervious flexible'material having one end closed and disposed longitudinally within said second chamber substantially coextensive therewith, said third tube being configured for snug conforming engagement in said second chamber and held by the walls thereof against displacement in said second chamber while being deformable under pressure deforming said structure, and a manifold interconnected in fluid communication between the other ends of said first and third tubes and said second tube.

3. In a pneumatic safety edge for power operated door that is actuated by a motor having a pneumatically controlled switch, a base of foam rubber, a block of foam rubber spaced from said base, a plurality of separating strips between said base and block and spaced apart to provide chambers extending lengthwise of the edge of said door, a flexible tube snugly received in each of said chambers, said tubes each engaging the Walls of the respective chamber to resist displacement therein while being deformable under pressure deforming said chambers, a manifold connecting said tubes at one end and a tube operatively connecting said manifold to said switch.

4. The safety edge of claim 3 together with a waterproof casing enclosing said base, block, separating strips, and tubes and presenting a flap that is adapted to mount said safety edge on said door.

5. The safety edge of claim 3 together with a plastic lining encasing said base, block, and outer separating strips, and a fabric casing about said lining, said lining and encasing provide a flap that is adapted to mount the safety edge on a door.

References Cited by the Examiner UNITED STATES PATENTS 1,975,828 10/1934 Conklin 200-86 2,561,663 7/1951 Keckley 200-86 2,783,325 2/1957 Luckey ZOO-86 2,843,690 7/1958 Miller ZOO-61.43 3,133,167 7/1964 Miller 20061.43

BERNARD A. GILHEANY, Primary Examiner. J. BAKER, Assistant Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1975828 *Aug 4, 1933Oct 9, 1934Nat Pneumatic CoPneumatic treadle control mechanism
US2561663 *Jul 14, 1947Jul 24, 1951Wm O BallardControl means for dental engines and the like
US2783325 *Jan 17, 1955Feb 26, 1957John A LuckeyExtended length hydraulic switch
US2843690 *Oct 18, 1956Jul 15, 1958Miller BrosSafety edge for hangar door
US3133167 *Apr 6, 1961May 12, 1964Miller BrosSafety edge for power operated door
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3478311 *Nov 22, 1967Nov 11, 1969Janos CzingulaAutomobile parking accident alarm system
US3581437 *Aug 28, 1969Jun 1, 1971Byrne Doors IncAircraft hangar door
US3662491 *Jan 8, 1970May 16, 1972Mecanismes Comp Ind DeSafety device for electrical window regulators
US3830018 *Mar 26, 1973Aug 20, 1974Toyota Motor Co LtdSafety device for power window
US3896590 *Aug 9, 1974Jul 29, 1975Miller BrosDoor safety edge construction
US4369344 *Jul 26, 1979Jan 18, 1983Vapor CorporationSensitive door edge Wiegand module switch assembly
US4396814 *Oct 20, 1980Aug 2, 1983Bearge MillerThreshold adjustable safety edge construction for a motor operated door
US4439894 *Sep 11, 1981Apr 3, 1984Trutzschler Gmbh & Co. KgDoor-operated safety shutoff system
US4698967 *May 5, 1986Oct 13, 1987F. L. Saino Manufacturing Co.Supervising apparatus
US5027552 *Aug 16, 1990Jul 2, 1991Miller Edge, Inc.Redundant sensing edge for a door for detecting an object in proximity to the door edge
US5130503 *Jun 24, 1991Jul 14, 1992Mark Iv Transportation Products CorporationPressure wave switch having improved contact structure and pressure equilization
US5159967 *May 8, 1991Nov 3, 1992Clark Door LimitedImprovements in and relating to roller doors
US5203110 *Jul 2, 1990Apr 20, 1993Marantec Antriebs- Und Steuerungstechnik Gmbh & Co. Produktions OhgSafety device for the closing edge of a door leaf
US5259143 *Apr 17, 1992Nov 9, 1993Wayne-Dalton Corp.Astragal for closure members
US5351440 *Nov 27, 1992Oct 4, 1994Lloyd VincentVertical lift device
US5481076 *Apr 16, 1993Jan 2, 1996Wayne-Dalton Corp.Astragal for closure members
US5566504 *Apr 3, 1995Oct 22, 1996Pitel; John A.Combination door gasket and safety edge strip
US5728984 *Nov 20, 1996Mar 17, 1998Miller Edge, Inc.Sensing safety edge systems
US5780940 *Sep 12, 1996Jul 14, 1998Air Check Corp.Hot wire safety switch
US6286257 *Feb 22, 2000Sep 11, 2001Rytec CorporationOverhead door with dual safety-edge
US6427382Aug 6, 2001Aug 6, 2002Rytec CorporationDual safety-edge for an overhead door
US7034682Jun 20, 2003Apr 25, 2006Rite-Hite Holding CorporationDoor with a safety antenna
US7151450Apr 18, 2006Dec 19, 2006Rite-Hite Holding CorporationDoor with a safety antenna
US20050044792 *Jun 20, 2003Mar 3, 2005Beggs Ryan P.Door with a safety antenna
EP1111633A2 *Dec 1, 2000Jun 27, 2001HÜBNER GmbHFinger guard for a door
U.S. Classification200/61.43, 200/86.00R, 49/27
International ClassificationE05F15/00, H01H3/24
Cooperative ClassificationE05Y2900/132, E05F15/0078, H01H3/24
European ClassificationE05F15/00B6H, H01H3/24
Legal Events
Feb 10, 1981ASAssignment
Owner name: MILLER, NORMAN K.,
Effective date: 19801121