Untitled record

Application filed April 22, 1886. Serial No. 199,748. (No mo lei.)

To all whom it may concern:

Be it known that Ϊ, Edward J. Colby, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illi,5 nois, have invented certain new and useful Improvements in Pneumatic Bells, of which the following is a specification.

My invention relates to bells used as doorbellsand for other similar purposes, and which io are operated by the motion of a column of air through a small pipe; and the object of my invention is to provide a cheap and simple device wherein the air is compressed or set in motion by means of a piston in a cylinder.

This object I attain by the mechanism illustrated in the accompanying drawings, wherein—

Figure 1 is a sectional view of the device. Fig. 2 is a detail.

A is a cylinder; B, apiston working therein; C, a cap thereon, having a central aperture, through which reciprocates the push button D, attached to the piston.

C' is a hole in the piston.

E is a spiral spring in the cylinder in front of the piston.

F is a pipe of suitable size and material.

G is a smaller cylinder, having the piston H, and the Spring E', and connected with the other 30 cylinder by the pipe or tube F.

I is a rack pivoted to the end of piston H and engaging the pinion M.

J is a cog-wheel tight on the shaft X, and carrying the dog L and spring K. The dog 35 bears against the ratchet-wheel M', and when the same is moved in one direction causes the cog wheel J to rotate with it.

N is an escapement lever attached rigidly to the hammer O and pivoted on the frame U.

P is a bed which supports the frame U and the cylinder support S and bell-support T.

, R is the bell,

V is a spring attached to the outer end of the frame U, and which bears against the rack 45 I and holds it against the pinion.

M and M' are rigidly secured together and loose on the shaft X, while the wheel J is tight thereon.

The use and operation are as follows: The push button or buttons are placed in suitable 50 position, as in a door-frame, where they may be so fixed as that the button will be visible on the outside of the house and the pipe F will connect within. The bell or bells are then placed in position where they are designed to 55 be used, as in the kitchen or hall. The cylinders are then connected by the pipe F. When pressure is applied, it is transmitted from the push-buttontotherack and pinion, aud thence to the cog-wheel. The escapement-lever is 00 thereby agitated and rocked, so as to give a series of blows on the bell. The bell will not ring as the piston retreats, because the gear is tight on the shaft and the pinion loose thereon. The pistons are assisted in returning to their 65 places by the spiral springs. When the finger is removed from the push the wind will escape through the hole. This hole is not necessary in all cases.