US 1345447 A
Description (OCR text may contain errors)
H. A. JOHNSON.
Patented July 6, 1920.
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QM' alfa H., A. JOHNSONl v RoLLING oooR.
APPLICATION FILED MAY24| 1919.
1 34:5,44T Batented July 6, 1920.
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HOWARD A. JOI-INSON, OF NORFOLK, VIBGINIA.
Specification ol!y Letters Patent. 4 Patented July 6, 1920.
Application vfiled May 24, 1919. Serial No. 209,476.
To all whom' it may concern:
Be it known that I, HowARn A. J oHNsoN, a citizen of the United States, and residing at Norfolk, Norfolk county, State of Virginia, have invented certain new and useful mprovements in Rolling Doors, of which the following is a specification.
The present invention relates to rolling doors and more particularly to the type comprising metal slats or sections hinged together and adapted to be wound up into a coil at the top of'the door.
The principal feature of the present invention resides in the means for securing` the top of the door to the wheels of barrels on the head shaft. Other features and objects of novelty will be apparent from the description taken in connection with the drawings in which:
Figure 1 is a top plan view of a part of a door Constructed in accordance with the present invention; and
Fig. 2 is a sectional elevation taken substantially on the line 2 2 of Fig. 1.
Referring to the drawings the numeral 10 indicates the head shaft of the usual construction having Secured thereto and spaced therealong the Wheels or barrels 11. The closure part of the door is made up of metal sections or slats 12 having their longitudinal edges hinged together in any suitable manner as indicated at 13.'
Heretofore the top member 14 of the closure portion of the door has been Secured directly to the wheels or barrels by pin fastenings, such as bolts or rivets. This type of fastening may fail either by shearing the pins or the pins crushing through the top member. The shearing Strength of the pins may be increased by increasing their diametrs but of course there is a limit to the size which may be employed. Likewise the resistance to crushing through the top member also increases with the diameter of the pins.v but not so rapidly as the shearing resistance of the pins. Of course the crushing resistance of the top member is also increased if it is made thicker. but the thickness of this top member is limited and should not be much greater, than the thickness of the other slats constituting the door closure.` It will be apparent. therefore, in order to properly secure the top member to the barrels. a suflicient number of pins must be provided. This means, therefore, that a relatively large number of wheels or barrels must4 be used to accommodate these pins.
According to the present invention means for securing the top member to the wheels is employed which permits the use of only a small number of wheels and yet ives as strong a fastening as is necessary. I` his result is accomplished by attaching the top member of the flexible door sections to a bar by means of as many pins as desired, and providing a connection between the bar and wheels which is as strong or stronger than the connection of the top member to said bar. As shown, the wheels 11 have a substantially spiral periphery the beginning of the spiral being indicated at 15 and the end at 16, this latter part having a greater radius than the beginning of the spiral at 15.
Between the points 15 and 16 the periphery of the wheel is provided with a fiat surface 15' and is formed with a transverse slot 17. An angle iron 18 is disposed with the inner surface of one leg resting on the fiat portions 15' of the wheels and the other leg disposed in said slots. The top member 14 of the door is Secured to the first mentioned leg of the angle iron by pin fastenings such as bolts 19. It will be observed that4 as many -bolts as desired may be employed as the angle iron is of substantially .the same length as the top member 14. Gonsequently, thev top member is Secured to the angle iron by fastening means which are strong enough to resist all forces coming on the same.v On the other hand, the angle iron being connected to the wheels by having a leg disposed in the transver'se slots provides practically an unbreakable connection. Furthermore, as the angle iron extends from end to end of the door a'nd is a rigid member, only a few wheels or barrels are necessary. Although an angleiiron has been described as being employed to secure the top member to the wheels, it is obvious that bars of other cross sectional shape might be employed the principal requirement being that) the bar have a surface thereof abutting a surface on the Wheel tofhold it from displacement, due to the pull of the door.
Although a Specific embodiment of thev invention has been described in detail. it is to be understood that the invention is not thus limited but includes modifications and changes which come within the scope of the appended claims.
1 `;Hai'i11g thus described the invention what 1. rolling door construction including in combination, a head shaft, spaced Wheels sccured to said'shaft, each wheel having a transrerse slot in its periph'ery, an angle mf ndisposed parallel tothe shaft with one v in the slot of the wheels, and a flexible IU leg of said angle iron.
door secured at its upper-edge to the other 2. A rolling door construction including in combination, a liead shaft. s'paced wheels Secured to said shaft, each wheel having a It'ransvcrse slot' in its periphery, an angle iron dispose'd parallel to the shaft with one leg in -the slot of the wheels. a flexible door, and pi'ns securing the upper member of the door tothe other leg of the angle, the number of pins being greater than the number of Wheels.
3. A\ro1li1'1g door construction including in combination. a head shaft, spaced wheels sccured to said shaft, each wheel having a lransvcrse slot in its periphery, a bar disposed parallel to lthe shaft having a projection seated in the slot of each wheel, and a flexible door Secured at its upper edge to said bar.
4. A` rolling door construction including in combination, a head shaft, spaced wheels securedto said shaft, each Wheel having a' transverse slot'in its periphery, a bar disposed parallel to the shaft and bearing against the surface bounding o'ne side of said slots whereby said bar is held against movement circuinferentially of the wheels, and a flexible door secured at its upper edge to said bar.
5. As an article of manufacture, a wheel or barrel for rolling doors having a spiral peripheral surface, the beginning and end of the spiral being connccted by a substautially radial surface and the spiral surface adjacent its point of least radius formed with a transverse slot.
6. As an article of manufacture` a wheel or barrel for rolliug doors having a spiral peripheral surface` formed with a trans= verse slot adjacent the point of least radius.
In testiniony whereof l attix mv Signature.
HOlVARD A. JO'IINH