US2122670A - Shade roller check - Google Patents

Description

July 5, 1938. J. M. WILSON SHADE ROLLER CHECK Filed nec. 15, 1922's Patented July 5, 1938 PATENT OFFICE SHADE ROLLER CHECK James M. Wilson, Newark, N. J., assignor, by mesne assignments, to Shade Check, Inc., Newark, N. J., a corporation of New Jersey Application December 15, 1936, Serial No. 115,897

3 Claims.

This invention relates particularly to spring actuated window shade rollers, and more especially to a check for preventing rotation of the roller under the influence of the spring at a speed in excess of a predetermined limit, for example when a shade escapes from the hand of the person raising or lowering the shade. However, the invention is equally susceptible to other types of spring operated rollers.

One object of the invention is to provide a novel and improved check of the nature described which shall include a part carried by the roller to engage a stationary member, for example a shade-bracket, said part normally permitting free rotation of the roller in raising or lowering the shade, in combination with means carried by the roller and actuated by centrifugal force caused by rotation of the roller at an excessive speed to positively engage said part so as to stop rotation oi the roller.

v Another object is to provide such a check which can be utilized in connection with many different types of spring operated rollers and many different types of stationary supports or roller brackets, and which can be easily and quickly applied to the end of a roller opposite the usual controlling pawls and ratchets so that the unit can be supplied tousers of shade rollers for application to rollers already ,in use.

Other objects are to provide a spring roller check of the character described winch shall include a pawl and ratchet mechanism carried by the roller and including cooperating parts, one of which is adapted to engage a stationary support, for example a shade bracket, while the other is movably mounted on the roller and subject to actuation by centrifugal force, said pawl and ratchet being normally disengaged from each other to permit free rotation of the roller in both directions at normal speed and being forced into interlocking engagement upon rotation of the roller at excessive speed under iniluence` of the roller springso as to stop rotation of the roller;

and to obtain otherA advantages and results as will be brought out by the following description.

Referring to the accompanying drawing in which corresponding and like parts are designated throughout the several views by the same reference characters,

Figure 1 is a1 top plan View of a shade roller installed in brackets and having a check embodying my invention applied thereto.

Figure 2 is an end View of the roller and shade bracket on thel line 2-2 of Figure 1.

(c1. 15s-3c) Figure 3 is an enlarged fragmentary sectional View on the line 3-3 of Figure 1.

Figure 4 is a sectional View on the line 4-4 of Figure 1.

Figure 5 is a sectional View on the line 5--5 of Figure 2 showing the pawl and ratchet tooth in normal disengaged relation.

Figure 6 is a horizontal sectional view on the line 'I-l of Figure 1.

Figure 7 is a view similar to Figure 6 showing 10 the pawl in engagement with the ratchet tooth to stop rotation of the roller, and

Figure 8 is a fragmentary plan View of one end of a shade roller showing a modification of the invention.

Specically describing the invention, the reference character A designates a spring operated shade roller of known construction having the usual controlling pawl and ratchet mechanism B at one end, a fixed shaft C and a trunnion D at its opposite ends mounted in stationary supports or brackets E. Within the roller is the usual spring for normally rotating the roller in one direction, for example to wind the shade thereon, the spring being tensioned or wound by rotation of the roller in the other direction as in lowering the shade.

At the end of the roller opposite the controlling pawls B is the check embodying my invention. This check is shown as including a casing G including a cup-shaped section I and a cover plate 2. Preferably, although not necessarily, the edge of the section I has a plurality of lugs 3 fitted in notches 4 in the cover plate for securing the cover plate on the cup-shaped section I.

The casing is secured to the end of the roller by the rotatable trunnion D which as shown preferably includes a pointed shank 5 to be driven into the roller, and a bearing portion forming a shoulder l between itself and the shank 5. At

the end of the bearing portion 6 opposite the shoulder 'I is a collar 8, and outwardly of the collar is a trunnion portion 9 to t the opening in the corresponding bracket E. The shank of the trunnion D passes through an opening in the ing through an opening |50 on the cover plate Y and being riveted to the shank I6 of a stop member which has a laterally projecting end II to engage the shade bracket E. The ratchet sleeve I4 and stop member II are normally freely rotatable on the trunnion D, although a complete revolution of the sleeve and stop member is prevented by engagement of the stop member with the top or bottom of the shade bracket, as shown, for example in Figure 2.

Cooperating with the ratchet sleeve I4 is a pawl I8 pivotally mounted intermediate its ends ona pin I9 secured in the casing section I. One end of the pawl I8 is counterweighted at 20, and a leaf spring 2l is interposed between the pawl and the casing section I so that the pawl is normally held out of engagement with the ratchet tooth I during rotation of the roller at normal speed as when raising and lowering the window shade, for example as shown in Figure 5, while when the roller is rotated at a greater than normalV speed or in excess of a predetermined speed under influence of the roller spring, the centrifugal force set up by rotation of the roller will swing the pawl I8 into engagement with the vratchet tooth I5, as shown in Figure 7.

Whenrthe pawl and ratchet tooth arerdisengaged as shown in Figure 5, the roller may freely rotate in either direction at normal speed. However,`the ratchet tooth is so related tothe direction of rotation of the roller that when the roller is rotated at a greater than normal speed or in excess of a predetermined speed under influence of the spring in one direction, as upon escape of the shade from the hand of the person adjusting it, the centrifugal force set up by rotation of the roller will swing the pawl I8 into engagement with the tooth I5, as shown in Figure 7, which will in turn cause rotation of the sleeve I 4 and stop member so that the laterally extending end vI'I of the stop member will engage the shade Vbracket 8 and stop further rotation of the Vroller in the same direction. Obviously the roller may be rotated in the other direction, vas in unwinding the shade, at any desired speed without interference by the pawl and ratchet check.

Ifodesired, the stop member I6, Il may befastened against movement to the bracket E or other vstationary member, such as the window frame.

In Figure 8 is shown a modification wherein the shade roller is mounted in another form of bracket 22 which has a notch 23 at one edge in Vwhich the stop member I1 is inserted. The

the roller or the brackets.

While the forms of the invention herein described are the now preferred forms, it should be understood that they are primarily for the purpose of illustratingthe principles of the invention and that many modifications and changes may be made in the details of'structure without departing from the spirit or scope of the invention.

Having thus described my invention, Ywhat I claim is:

1. The combination with a spring actuated roller,v of meansfor checkingthe roller upon rotation thereof under influence of its spring at a speed in excess of a predetermined limit, said means includingra stationary member adjacent but spaced Yand separate from one end of the roller, a casing including a cup-shaped section having a central opening in its bottom, a trunnion pin tted coaxially in said end of the roller and having a shoulder engaging the bottom of the casing to clamp the casing between itself and the end of the roller, a ratchet sleeve having T a tooth mounted on said pin outwardly of said shoulder for relative rotation coaxially therewith and having a lateral projection adapted in one position to engage said stationary member, and a pawl pivoted on said casing to cooperate with said ratchet tooth and normally disengaged therefrom to permit rotation of said roller under influence of the roller lspring at speeds below said limit, said pawl being actuated by centrifugal force into engagement with said tooth and said ratchet sleeve being thereby. rotated to cause engagement of said lateral projection with said stationary member upon rotation of said roller at excessive speed to stop rotation of the ro-ller.

2. The combination with a spring actuated roller, of means for checking the roller upon rotation thereof under influence of its spring at a speed in excess of a predetermined limit, said means includinga stationary member adjacent but spaced from one end ofthe roller, a casing secured coaxially on said end of the roller, a pin kthrough and coaxial with said casing and freely rotatable relative to said stationary member, a ratchet sleeve having a tooth mounted on said pin within the" casing for relative rotation coaxially therewith and having a portion projecting lfrom said casing and adapted inone position to engage said stationary member, and a pawl pivoted in said casing to cooperate with said ratchet tooth and normally disengaged therefrom to permit rotation of said roller under influence of the roller spring at speeds below said limit, said pawl being-:actuated 'by centrifugal force into engagement with said tooth and said ratchet sleeve being thereby rotated to cause engagement of said projecting portion with said stationary member upon rotation of said roller at excessive speed tol stop rotation of the roller.

3. The combination with a spring actuated roller, of means for checking the roller upon rotation thereof under-influence of its spring ata speed in excess of a predetermined limit, said means including a vstationary member adjacent but spaced from one end of the roller, a pin on said end of said roller coaxial therewith and freely rotatable with respect to said stationary member, a part on and rotatable relatively to said end of the roller and adapted inone position to engage said stationary membenand a second part pivotally mounted on said roller to cooperate with said rst part and normally ldisengaged therefrom to permit free rotation of said roller under influence of the roller spring atv speeds below said limit, said second'part being actuated Aby centrifugal force into engagement with said first part and said'iirst part being thereby actuated into engagement with said stationary mem-

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