US2166745A

US2166745A - Screen control

Info

Publication number: US2166745A
Application number: US226757A
Authority: US
Inventors: Appel Sydney
Original assignee: SAMUEL APPEL; WILLIAM J FOSTER
Current assignee: SAMUEL APPEL; WILLIAM J FOSTER
Priority date: 1938-08-25
Filing date: 1938-08-25
Publication date: 1939-07-18
Anticipated expiration: 1956-07-18

Description

July 18, 1939. s. APPEL 2,166,745

SCREEN CONTROL 1 Filed Aug. 25, 1938 WITNESSES INVENTOR S /dng flppel 6% M ATTORSM Patented July 18, 1939 UNITED STATES SCREEN CONTROL Sydney Appel, Newark, N. J., assignor of onethird to William J. Foster, Little Ferry, N. J., and one-third to Samuel Appel, Newark, N. J.

Application August 25, 1938, Serial No. 226,757

4 Claims.

This invention relates to an improved screen control and has for an object to provide a construction wherein pull cables are provided for positively raising and positively lowering a screen.

Another object of the invention is to provide a control for a curtain, screen, or the like wherein the same may be moved upwardly and downwardly readily and held in any desired adjusted position by merely releasing the actuating means.

A further object, more specifically, is to provide in a screen control a pawl-and-ratchet structure associated with braking means, the parts being so arranged that the ratchet structure will 5 rotate with the screen roller when the screen is being elevated but will remain stationary when the screen is being lowered.

In the accompanying drawing- Fig. 1 is a vertical sectional View through a curtain and certain associated parts including a control embodying the invention, certain parts being shown in elevation;

Fig. 2 is an enlarged fragmentary sectional view through Fig. 1 approximately on the line Fig. 3 is a view similar to Fig. 2 but showing a modified construction;

Fig. 4 is a view similar to Fig. 3 but showing a further modified construction.

Referring to the accompanying drawing by numerals, I indicates a screen or curtain of any desired kind which is secured at one end to a pole or roller 2, which pole or roller is rotatably supported in brackets 3 and 4. In theatres and elsewhere it is desired to raise and lower the screen from time to time and to hold the screen in any desired adjusted position.

As indicated in Fig. 1, there are provided pulleys 5 and 6 which are pinned or otherwise rigidly secured to the pole 2 so as always to rotate therewith. Cables I and 8 are arranged to be wound on these pulleys, said cables being wound in opposite directions on the respective pulleys so that when one cable is pulled the pulleys will rotate in one direction and when the other cable is pulled the pulleys will rotate in the opposite direction. It will be noted that auxiliary pulleys 9 and I0 guide the cable 8, while auxiliary pulleys H and I2 guide the cable 1. If desired, these cables may be connected together, as illustrated at the left in Fig. 1, though this is not essential. When the cable I is pulled the curtain l is rolled and cable 8 is wound on pulley 6. When cable 8 is pulled the reverse action will take place, namely, the pulleys and roller 2 will rotate in the reverse direction and allow the curtain l to move downwardly.

As shown particularly in Fig. 1, pulley 5 is provided with a hub I3 formed integral therewith and on this hub is arranged a ratchet wheel l4 5 held against rotation in one direction by a pawl l5 secured to a wall or other suitable support. The ratchet Wheel [4 is formed of two parts, namely, part l8 and part 11, said parts being hingedly connected together at l8. A tension 10 screw l9 connects the parts together at a point opposite the hinge l8. A suitable spring 20 provides for a cushioning action in respect to the clamping action of the screw l9. Brake band sections or shoes 2| and 22 are secured respec- 15 tively to the parts I '6 and I! by suitable screws or other means 23. This brake band structure is adapted to press tightly against the sleeve or hub l3 of pulley 5 which is rigidly secured to roller 2 so that when pulley 5 is rotated in one 20 direction power will be transmitted to the roller 2 so that the roller and also the ratchet wheel will be rotated. However, when the cable 8 is actuated for lowering the curtain I the roller 2 will slip in the brake shoe structure formed by 2

members

21 and 22 and associated parts. There is enough friction, however, to stop and hold the curtain at any point. It will be seen, therefore, that when the curtain is raised roller 2 and associated parts freely rotate but when the curtain 30 is lowered roller 2 is rotated against the action of the friction of the brake bands 2| and 22. In the course of time if the parts should become somewhat loose a desired tension may be secured by adjusting the screw I9. 35

In Fig. 3 a structure is shown wherein ratchet wheel M is used but instead of having the brake shoes 2i and 22 engaging the hub l3 the parts are so arranged that these brake shoes will engage directly the roller 2. In Fig. 4 the same structure 40 as shown in Fig. 3 is presented except that the ratchet wheel M is provided with a flexible section l4" instead of a hinge l8 as shown in Fig. 2. This form of the invention could be arranged as shown in Fig. l, namely, with the brake shoes 2| and 22 engaging the roller 2, or the brake shoes could be arranged on the hub I3.

I claim:

1. In a screen control, a pulley provided with a hub, a ratchet wheel mounted on said hub, said 50 ratchet Wheel being divided at one point, means for moving said ratchet wheel to close said point of division, a pawl for preventing said ratchet wheel from rotating in one direction and a friction shoe structure connected to said ratchet 55 wheel and engaging said hub whereby said pulley will rotate freely in one direction and in the other direction will rotate against the action of the friction produced by said friction shoe structure.

2. In a screen control device, a ratchet wheel divided into two parts, means hingedly connecting said parts together at one point, a brake shoe carried by each of said parts interiorly thereof, and a tension screw arranged diametrically opposite said hinged structure for causing said brake shoe to function when the device is in use.

3. A screen control including a ratchet wheel divided at one point and connected at a point diametrically opposite, a screw for drawing together said divided point to reduce the diameter connected to said ratchet wheel interiorly thereof 10 and positioned to engage said roller whereby said pole will be rotated freely in one direction with the ratchet wheel and in the other direction will rotate against the action of the friction produced by said friction shoe.

SYDNEY APPEL.