US367152A

US367152A - mahony

Info

Publication number: US367152A
Authority: US
Publication date: 1887-07-26
Anticipated expiration: 1904-07-26

Description

(No Model.) 2 Sheets-Sheet 1.

J. J. MAHONY.

DUMB WAITER STOP.

No. 367,152. Patented July 26, 1887.

J m. o kw 2 AH V I my p I a f v To all whom it may concern.-

UNITED STATES PATENT OFFICE.

JOHN J. MAHONY, OF SAN FRANCISCO, CALIFORNIA.

DUMB-WAITER STOP.

SPECIFICATION forming part of Letters Patent No. 367,152, dated July 26, 1887. Application filed May 11, 1887. Serial No. 237,905. (No model.)

Be it known that I, JOHN J. MAHONY, of the city and county of San Francisco, State of California, have invented an Improvement in Dumb-Waiter Stops; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to that class of reciprocating elevators commonly known, from the use to which they are put, as dumbwaiters', and to certain improvements with respect to the mechanism by which they are stopped at any desired point in the course of their travel.

Theseiinprovements are of the same general nature as those shown in my Patent No.

856,948, dated February 1, 1887 but they are herein greatly simplified, many of the parts being omitted and all springs being dispensed with. 1

My invention consists in the combination and arrangement of the pivoted gravityeatch,

' tively stopping the waiter at points at which it is intended to rest, thereby doing away with the necessity of friction to effect the result.

The particular object is to provide mechanism of a simple and effective character,which will operate certainly and without noise.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 shows the stop in position going up. Fig. 2 shows the stop in position of rest. Fig. 3 shows the device raised to clear the catch. Fig. 4 shows it descending. Fig.5 is a horizontal section. Fig. 6 is a detail of a portion of the lever F, showing the shoulder f.

A is the well or shaft, having the guides a. B is the dumb-waiter, mounted in the well and adapted to move up and down therein.

The waiter is suspended by means of a rope, which may be supposed to extend upwardly, and after passing over a suitable pulley to extend down again, and to be provided with a weight, as usual;

To the side of the guide a (or otherwise secured inthe well or shaft) is fixed a rack or strip, D, which has on one edge an inclined notch, 66, the base of which terminates in a straight shoulder, d. The lower end of the strip is beveled at (1*, and its upper end has its has a weight, w, the tendency of which is to throw the other end up; but this movement, as well as the reverse movement of said triplever, is limited by reason of the shoulder f on the weight end coming in contact with the edge of the catch-lever E below or above, as the case may be.

The operation is as follows, supposing the waiter to be in the posit-ion shown in Fig. 1: It will be seen that the catch-1ever E is thrown over against its stop 6 and the trip is raised by its weight, so that its shoulder f is stopped by the edge of the catch-lever below. Now, upon moving the waiter up the operative end of the trip-lever co mesin contact with the beveled low er end of the strip D, and is turned on its pivot until limited'by its shoulderf coming in contact with the edge of the catch-lever above, and in this position its end lies-practically flush with the-edge of the catch-lever. Both levers now pass the lower end of the strip D, and when they reach the shoulder d of said strip both are thrown into it by the action of the weight W of the catch-lever, the lower end of said lever resting in the shoulder, and thereby supporting the waiter, as is shown in Fig. 2. Now, in order to lower the waiter it is first moved up still higher until both levers are free of the strip D, which has prevented the trip-lever from falling back, whereupon said lever being new free falls back to its original position and the catchlever is limited by the stop 6 so as not to be in the line of the upper end of the strip, which for this purpose is slightly out back at (1 Now, the waiter is started down, and the end of the trip-lever coming in contact with the upper end of the strip and being stopped by the engagement of its shoulderf with the edge of the catch-lever is forced over to one side and carries the catch-lever with it, so that as it passes down the face of the strip it holds the lower end of said catch-lever away from the strip and allows it to pass the shoulder d without touching. As soon as the lower end of the strip has been passed, the parts return to position under the influence of their respective weights.

Having thus described my invention, what I claim as new, and desire to secure by Let ters Patent, is

1. In combination with a dumb waiter mounted and suspended so as to be reciprocated, a strip in the well or shaftin whichthe waiter moves, having a shoulder on its inner face, a pivoted weighted lever secured to the waiter and having its lower end adapted to engage the shoulder of the strip, thereby supportingthe waiter, and an oscillating weighted trip-lever connected with the catch-lever and adapted to come in contact with the face of the strip, whereby it forces the catch-lever over from the face of the strip, thereby allowing its descent, substantially as herein described.

2. In combination with a reciprocating dumb-waiter, the mechanism for supporting and relieving it, consisting of a strip in the well or shaft, having a shouldered face, avi- 3. The dumb-waiter stop consisting of the vibrating weighted catch-lever pivoted to the waiter, the oscillating weighted trip -lever pivoted to the catch-lever and having a shoulder by which its movement is limited, the fixed stop by which the movement of the catch-lever is limited, and theraek-strip D in the well or shaft in which the waiter moves, having a shoulder with which the catch-lever engages to support the waiter anda face against which the trip-lever plays to free the catch-lever of the shoulder, substantially as herein described.

In witness whereof I have hereunto set my hand.

JOHN J. MAIIONY.

\Vi tn ess es:

0. D. COLE, J. H. BLooD.