Title:
Drain plug
United States Patent 2273480


Abstract:
This invention relates to stoppers for laundry tubs and the like. Customarily, stoppers of this nature intended to close the drain of a tub consist of a piece of rubber or other material of frusto-conical configuration which are simply placed in the opening of the drain and prevent passage...



Inventors:
George, Yates
Application Number:
US35435240A
Publication Date:
02/17/1942
Filing Date:
08/27/1940
Assignee:
George, Yates
Primary Class:
International Classes:
F16L55/132
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Description:

This invention relates to stoppers for laundry tubs and the like.

Customarily, stoppers of this nature intended to close the drain of a tub consist of a piece of rubber or other material of frusto-conical configuration which are simply placed in the opening of the drain and prevent passage of water therethrough. These stoppers are easily dislodged when the tub is in use by engagement of the contents of the tub with the ring of the stopper. As it is difficult and annoying to frequently replace the stopper in a tub full of hot water and clothing, it is an object of the present invention to provide a drain plug which is not readily displaceable.

It is a further object of this invention to provide a plug which will effectively seal the drain.

It is a further object of this invention to provide a plug which is adaptable to existing types of drains and to drains of different sizes.

It is a further object of this invention to provide a plug of this nature which may be readily inserted or removed.

This invention possesses many other advantages and has other objects which may be made more easily apparent from a consideration of one embodiment of the invention. For this purpose there is shown a form in the drawing accompanying and forming part of the present specification. This form will now be described in detail, illustrating the general principle of the invention; but it is to be understood that this detailed description is not to be taken in a limiting sense, since the scope of the invention is best defined by the appended claim.

Referring now to the drawing: Figure 1 is a side elevation of a device embodying the present invention in place in a drain, the drain being in section; Figure 2 is a bottom plan view of the drain and plug of Figure 1; Figure 3 is a sectional elevation of the device shown in Figure 1 with the parts in one position of operation; and, Figure 4 is a view similar to Figure 3, showing the parts in a different position of operation.

The present invention contemplates the provision of an expansible plug, which can be made to securely fit a drain, and which does not depend upon the taper of the drain for sealing. To this end, the form of the invention shown in the drawing includes a resilient ring which is deformable by relative movement between other parts of the device for effecting a circumferentially continuous seal with the side walls of a drain.

The device shown includes a cylindrical body portion 10 having at its lower end an annular flange II. Above the cylindrical body portion 10 is a second flange 12, and means is provided to adjustably vary the gap between the two flanges.

This is accomplished by the provision of a shank 13 adjustably threaded through the upper end I0a of the cylindrical body portion 10. The shank is rotatably mounted in a bore in the flange, and provided with a shoulder 14, bearing against the upper side of the flange 12. A suitable handle 15 is provided on the upper end of the shank 13 for grasping and for rotating the shank. In order to facilitate relative rotational movement between the shank and the body portion, the lower face of the body portion is provided with fingers 16 for engaging the screen or grid 17 in the drain D.

Between the two flanges, and surrounding and held in position by the cylindrical body portion 10, is a resilient ring 18 of rubber or the like, of such size as to be capable of expansion into contact with the walls of the drain upon movement of the flanges 11 and 12 toward each other. The whole assembly is prevented from coming apart by the provision of a washer 19 on the end of the threaded shank 13. It has been found convenlent to form the ports of the device from plastic material, which permits the bonding of the washer to the shank by acetone or the like.

The device, as described to this point, can readily be used, but requires considerable turning of the handle 15 to expand the ring to form a satisfactory seal. In order to facilitate the engagement of the rubber ring with the walls of the drain, the facing sides of the flanges II and 12 are tapered as shown in Figure 3, while the resilient ring is made rectangular in cross-section. With such a construction, approach of the flanges towards each other causes the ring to bulge, rather than to expand, as shown in Figure 4, which deformation is achieved with considerably less work being performed on the rubber ring. This bulging also makes the contact with the drain of the nature of a line contact, which is much easier to make continuous than a wider contact, and consequently less likely to leak under the slight pressure encountered in structures of this nature.

It is to be understood, of course, that variations in the construction may be practiced without departing from the spirit of the invention as defined in the appended claim. For instance, it is unneccessary that the cylindrical portion be wholly on the lower flange; it might well be partly on the upper flange or even wholly there, depending upon the circumstances. Also, the shank 13 and flange 12 may be formed in one piece, if desired, but such construction makes the shank and flange difficult to turn, because of the friction between the flange and the resilient ring 18.

I claim: A stopper for drains and the like comprising a cylindrical body having a flange secured to one end thereof, a second flange, a member rotatable in said second flange and threadedly engaging the cylindrical body, said member having a shoulder engaging the second flange to move said second flange toward the first mentioned flange upon rotation of the threaded member in said cylindrical body, and a resilient ring surrounding the cylindrical body between the flanges. GEORGE YATES,