Edwin S. Piper Internal Bottle Stopper

U.S. Patent Number: 318,290                           Patented: May 19, 1885

Edwin S. Piper’s patent application was filed August 28, 1884 and specified:

I, Edwin S. Piper…residing at Bristol…Connecticut, have invented certain new and useful Improvements in Removable Internal Bottle-Stoppers…simple and compact in construction, easy to operate, and durable and efficient in use…

My invention consists in a removable internal bottle-stopper in which the stopping disk is contracted for the removal of the stopper independently of the bottle…

Figure 1 is a view in perspective of one form which my invention may assume.  Fig. 2 shows the application of the device to a bottle in which it is shown in its closed adjustment and with its stopping-disk normally expanded.  Fig. 3 is a view with the stopper in its open adjustment and with its disk contracted; Figs. 4 and 5 are detached views, partly in elevation and partly in section, respectively, showing the stopping-disk expanded and contracted.

In the construction herein shown an elastic flanged button, A, forming the stopping disk, is interposed between the lower end of the frame of the stopper, which frame consists of two spring arms, B, having their upper ends united by a cross bar, C, and their lower ends separated and provided with semicircular bearings D, which together form a plunger, and the open end of a thimble or contractor, E, removable secured to the lower end of a spindle, F, passing through the button extending below the frame, journaled in the cross bar thereof and held between the bearings D, which are grooved, as at G, for the purpose. 

The upper end of the said spindle projects beyond the cross bar of the frame and is provided with an eye, H, or equivalent enlargement, which is normally in conjunction with the cross bar.  The lower end of the spindle is threaded for the application of the contractor or spindle aforesaid, which is tapped and threaded, as at l, for the purpose…

When it is desired to remove the stopper from the bottle, the button is contracted and displaced into the contractor or thimble by introducing the lower end of the frame thereinto, as shown in Figs. 3 and 5 of the drawings.  This is preferably done without disturbing the adjustment of the frame in the bottle by drawing out the spindle and thus pulling the contractor or thimble over the flange of the button.  The operation is effected by engaging the spindle by its eye and drawing it outward against the cross-bar of the frame as a point of leverage…(permitting)…the stopper to be readily removed…entirely independently of the bottle.

In introducing the stopper into the bottle it is simply forced thereinto without contracting the button, as herein provided for.  The drawing out of the spindle for the purpose described may be effected by any desired means.  Preferably a special instrument resembling pliers, and having its jaws adapted to graspe the eye of the spindle and engage with the cross-bar of the frame as a point of leverage for lifting the spindle, will be employed.


This interesting patent was included because it was designed as a removable internal stopper and, judging by the illustrations included with the patent specifications, it was intended for use with Hutchinson bottles.  The description of how the stopper functioned sounds similar to the removable plug utilized in Thermos bottles.  There is no evidence Piper achieved any marketing success with his closure.