US443962A

US443962A - Device for raising and lowering cellar-doors

Info

Publication number: US443962A
Authority: US
Publication date: 1890-12-30
Anticipated expiration: 1907-12-30

Description

I (No Model.)

0. E. GOLDEN. DEVICE FOR RAISING AND LOWERING GELLAR DOORS.

No. 443,962. Patented Dec. 30,1890.

WITNESSES IN VENTOH A TTOHNE rs @UmTED STATES PATENT OFFIC CHARLES EDWARD GOLDEN, or osKALoosA, KANSAS.

DEVICE FOR RAISING AND LOWERING CELLAR-DOORS.

SPECIFICATION forming part of Letters Patent No. 4=43,962, dated December 80, 1890.

Application filed April 10, 1890- Serial No. 347,353- (No model.)

To all whom it may concern:

Be it known that 1, CHARLES EDWARD GOLDEN, of Oskaloosa, in the county of J efferson and State of Kansas, have invented a new and useful'Device for Raising and Lowering Cellar-Doors, of which the following is a full, clear, and exact description.

My invention relates to a device for raising and lowering cellar-doors, and has for its object to provide a device of simple and durable construction adapted for attachment to any cellar-door, but especially to that class known as trap-doors, whereby the door when released will be automatically opened and substantially automatically closed when desired through the medium of an attached pendulum.

The invention consists in the novel construction and combination of the several parts, as will be hereinafter fully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forminga part of this specification, in which similar figures and letters of reference indicate corresponding parts in both the views.

Figure 1 is a perspective view of the device applied to a trap cellar-door, and Fig. 2 is an end view of the same.

The door 10 is hinged at one side to the floor 11 in such manner that when it is closed to the horizontal position it will cover an opening 12 in the said floor formed over a stairway 13, leading into the cellar or a compartment below.

To the mop-board 14 of the wall or any other convenient place, preferably opposite one side of the opening 12, a lever 15 is fulcrumed, the lower end of which lever extends through and beneath the floor, and is connected by a link 16, extending transversely over the opening 12, with the free end of the spring-keeper 17, which keeper is attached at its other end to the side wall of the opening below the jamb, upon which the door closes. This springkeeper may be practically made to extend from end to end of the opening, and in the jamb at any convenient point a recess 18 is formed immediately at the rear of the keeper.

Upon the under faceof thedoor, at or near its center preferably, an angled latch 19 is socured, and at one side of the said latch the upper end of a link 20 is pivotally attached to the said door, as best illustrated in Fig. 1.

Below the hinged lower side of the door bearing-boxes or hangers 21 are attached to any convenient suitable support in the lower chamber or cellar, and in the said bearingboxes or hangers a crank-shaft 22 is journaled. The body of the crank-shaft, which passes through the bearing-boxes or hangers, is horizontal, and a crank-arm is provided at each end extending at a right angle from the body in opposite directions. To the inner crank-arm o. of the crank-shaft the lower end of the link 20 is pivotally attached, and upon .the outer crank-arm a a weight 23 is adj ustably secured, which weight is so located that it will slightly more than counterbalance the weight of the door 10.

When the door is closed, as illustrated in Fig. 2, the latch 19 of the door passes down in the recess 18 of the jamb and engages with the under edge of the spring-keeper 17, and both of the crank-arms are carried to a horizontal position. When it is desired to open the door, the lever 15 is pushed in the direction of the door, whereupon the free end of spring-keeper is drawn in the direction of the hinge side of the door and the latch 19 is released, whereupon the weight upon the outer member of the crank-shaft forces the said member downward to the vertical posi tion, as illustrated in Fig. 1, and automatically carries the door upward to the open position, as shown in the same figure.

The weight 23 upon the crank-arm a of the crank-shaft acts as a pendulum. Thus to close the door, if it is given a quick push downward, the momentum of the pendulum-section of the crank-shaft will carry the door to its locked or closed position.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent 1. The combination, with a door, of a shaft having a crank-arm at each end, a weight adjustably secured on one crank-arm, a link pivotally connected to the other crank-arm and to the door, and means for locking the door closed, substantially as described.

2. The combination, with a door, a latch secured to the said door, a spring-keeper secured at one end to the door-jamb, a lever fulcrumed near the door, and a link connecting thefi'ree end of the keeper and the said lever, of a era'nksh'aft havin g its inner cran karm linked to the doorand its outer crank-arm Weighted, substantially as shown and described.

3. The combination, with a door, a shaft having a crank-arm at each end, a Weightedjustably secured on one crank-arm, and a link pivoted to the other crank-arm and to the door, of a latch secured to the under side of the door, at spring-keeper having one end secured to the side wall of the door-opening, a pivoted lever, and a link connected to the lower end of the lever and to the free end of the keeper, substantially as herein shown and described.

CHARLES ED \VARD GOL D EN.

\Vitnesses:

H. J. GRAVES, J. L. RAINES.