US1888345A - Friction sash fixture - Google Patents

Description

Nov. 22, 1932. CUMMINGS 1,888,345

FRICTION SASH FIXTURE Filed March 27, 1929 INVENTOR. EM.Gwmvuxms. '5

A TTORNE YS.

Patented Nov. 22, 1932 UNITED STATES PATENT OFFIC EARLE W. CUMMINGS OF LOS ANGELES, CALIFORNIA,.ASSIGNOR TO WATEBTITE CASE- MENT HARDWARE 60., OF SANTA BARBARA, CALIFORNIA, A CORPORATION 01 CALIFORNIA FRICTION SASH FIXTURE Application filed March 27, 1929. Serial No. 350,272.

This invention relates to pivot fixtures for window sash of the swinging type such as casement or transom sash, and wherein the sash swings either inwardly or outwardly on the fixtures in place of hinges.

The objects of the invention are to provide a fixture of the kind mentioned which will be applicable to any of the types of swinging windows, and which will hold the sash more firmly than prior fixtures by reason of a special friction joint embodied in the device.

In the drawing accompanying this application Fig. 1 is a plan view of a portion of awindow sill and sash mounted on my im proved fixture and shown partly opened, and also in dotted line fully opened.

Fig. 2 is a plan view of the fixture of Fig. 1 in the position it would occupy if the window sash were closed, the sash and sill being omitted in this View.

Fig. 3 is a front elevation of the fixture of Fig. 2 also with window sash and sill omitted.

Fig. 4 is an enlarged cross section of one of the friction joints of the fixture as seen from the line 4-4 of Fig. 2.

Fig. 5 is an enlarged perspective view of the preferred joint spring.

In the drawing 1 is the window sill or frame in which the sash is mounted. 2 represents the sash mounted to open and close in the frame by means of my fixture. The fixture comprises a frame or sill plate 3 adapted to be secured to the window frame or sill by any suitable means such as the screws 4, and a plate 5 adapted to be secured to the edge of the sash by any suitable means, and links 6 and 7 pivotally connected at opposite ends to plates 3 and 5 respectively. It is understood that a complete fixture as shown is used at two opposite edges of each sash, either top and bottom or at the sides.

Link 6 is considerably longer than link 7 as shown so that when the sash is fully opened to the dotted position indicated at X in the drawing the center of pivot 8 will go beyond the'center of pivot 9' and thus stabilize the sash in open position, as the parts then stop solidly against one another.

Pivot 8 and pivot 11 are in this showin plain rivets preferably of non-rustable meta while pivots 9 and 10 are of especial construction to induce a heavy friction on the joints so as to firmlyhold the window at any point of adjustment.

In Fig. 4 the internal construction of the joint is shown and in which it will be seen that between the link 6 and plate 3 is a cup member 12 preferably made out of brass or bronze, and within which cup member is a pair of disk springs 13 placed in opposed relation to one another and bearing respectively against the bottom of the cup 12 and the plate 3 so as to force the cup outward and tightly clamp the link 6 between the relatively large head 10 of the rivet and the cup, it being understood that the link 6 is free to turn on the rivet, and the rivet being shouldered and immovably riveted to the lower plate 3 as indicated.

Joint 9 is of the same construction as the joint just described and the levers are so positioned that the levers or links lie parallel with one another when the fixture is closed to the position shown in Figs. 2 and 3, and in Fig. 3 it will be observed that links 6 and 7 are also offset slightly at the points 6 and 7' so as to provide a flat space to revolve upon and yet clear the members when folded so that there will be no interference between any slight projection of the screws or rivet heads in the adjacent members.

It is of course evident without further showing in the drawing that other types of springs, such as a spiral spring for instance, may be used within the cup instead of the disk springs shown, but I have found that the disk springs are of great power and give an even pressure around the entire diameter of the cup which is not the case with the spiral springs.

In considering this structure it should be noted that the rivet 10 being shouldered insures that the cup 12 will not be clamped between the plate 3 and link 6 and that the springs will always be free to exert their force uninfluenced by any unknown frictional resistance due to riveting. The joint will therefore always preserve the same frictional resistance as the movement of the links takes place between the head 10 of the rivet and the flat surface of the cup, and these two members preferably being of brass or bronze 5 and the links of sherardized or otherwise rust-proofed steel, will always preserve a smooth running joint. If desired, of course the plates and links may also be of brass though they have not the strength of the steel links of the same size.

From a consideration of the special joint on my fixture it is evident that greater friction can be secured by having the diameters of the cup and large head of the rivet as 15 lar e as possible, or if desired the frictional sur aces of these members as well as the frictional surfaces of the links may be given any do ee of indentation desired to increase the holding power, withoutaltering the general manner of functioning of my improved joint.

I am aware of course that it has been common practice for years in the oints of levers and under the nuts of bolted structures of all kinds to place a spring or split washer to induce greater friction, and such joints have been applied to window sashes, but such washers in movable joints have given trouble due to the fact that the washer wears out, and that the friction of such joints depends on how hard the riveting has been done, also such joints do not give an even friction but press harder on one side of the joint and are therefore unreliable, whereas in my joint the friction is absolutely even over the whole surface of the joint at all times and may be depended upon over a period of many years, and since the springs are enclosed in a waterproof housing they are protected against the elements and also against the ingress of grit t destro them.

It is 0 course possible to use other types of springs in my cup joint with lower efficiency, but my disk springs are especially devised for the joint to give an even axial pressure and at the same time prevent the cup from turning. This object is attained by notching out the saucer-shaped disks in several places as at 14 in Fig. and which leaves enough sharp ed es to grip the under-side of the cup and the %ace of the lever or plate between which the springs react. Also to be observed is that in punching the central holes in the springs an outwardly projecting rough edge is left at 15 which interlocks with the edge of the opposite spring, and also more or less grips the rivet shank to further insure the sprin s, cup, plates and rivet shank against re ative turning.

While I have shown a fixture with the joint applied to one end each of two levers,

it is manifest that it may be applied to all the joints of the levers if desired.

I claim:

1. A swinging window mounting comprising a pair of elongated flat attachment plates spaced apart to permit one to be placed over the other when the window is closed, a pair of links between the plates pivoted at opposite ends respectively at spaced points to said plates, means spacing said links to allow folding thereof between the plates in overlying position, and a friction means embracing and retarding pivotal movement of one of said pivots, one of said links being shorter than the other whereby the plates will diverge when the window is opened.

2. A swinging window mounting comprising a pair of elongated flat attachment plates spaced apart to permit one to be placed over the other when the window is closed, a pair of links between the plates pivoted at opposite ends respectively at spaced points to said plates, means spacing said links to allow folding thereof between the plates in overlying position, and a friction means embracing and retarding pivotal movement of one of said pivots at one end only of each link, one of said links being shorter than the other whereby the plates will diverge when the window is opened.

3. In a swinging window fixture, two flat plates pivoted together, the pivotal joint comprising a shallow cup between the plates formed with a flat bottom in contact with the inner side of the first of said plates, a pivot pin passing through both plates and cup immovably riveted at one end to the second plate and rovided with a large head on its other end in flat contact with the outer side of said first plate, a sheet metal s ring within the cup forcing same towar said first plate to resiliently clamp the first plate between the cup and the pin head, and means to prevent relative rotation of said pin, spring and cup.

EARLE W. CUMMINGS.

lOS

lit

Images