US1763577A - Sash lift - Google Patents

Description

June l0, 1930.

H. E. CAMPBELL sAsH LI' Original Filed June 18, 1927 gf@ .E

. lNvEN-roR ATTORNEYS.

Patented June 10, 1930 UNITED STATE-S PATENT neri;

HARRY E. CAMPBELL, OF BALTIMORE, MARYLAND, ASSIGNOR TO CAMPBELL METAL WINDOW CORPORATION, OF BALTIMORE, MARYLAND, A CORPORATION OF MARY- LAND SASH LIFT `Amlication filed June 18, 1927, Serial No. 199,690. Renewed October 24, 1929.

The present tendency in window design is to make windows larger than was formerly the custom. This combined with the fact that windows are frequently made of metal and are provided with plate glass, makes them very heavy so that even if friction is reduced to a minimum and the window is accurately counter-weighted, there is a large moment of inertia that must be overcome in starting to move a sash. This is particularly important in connection with the lower sash which is the one ordinarily opened.

The present invention relates to an arrangement of sash lifts which can be made very inexpensively and which will apply leverage to start the lower sash in motion. The arrangement comprises a pair of plates -having a portion bent over at the top to j in its movement.

form a projection, each of which plates is attached to the lift rail by pivot about in line with one end of the projecting portion. An extension for each plate is provided that goes beyond its pivot, and stops are arranged to limit the movement of the plate about the pivot. The two pivots are both positioned toward the center of the sash and the plates extend down so that their bottom edges contact with the sill. When one starts to lift the sash in the usual manner, the plates will turn about the pivots and the projections will press against the sill exerting leverage to start the sash in motion. The stops should limit the movement of the plates to approximately 30, and certainly to less than'45o, and inasmuch as the operator normally is above the window sill, it will be found that the projections are then substantially perpendicular to the line of force extending through the operators arms so that the sash can be very easily continued In order to lower the sash, a stop is provided which will prevent the plate from turning substantially below the position where it is parallel with the sill so that for this movement it will operate in the normal manner.

The operation of the lifts and the manner in which they may be made, can be readily understood by a reference to the accompanying drawings, in which Fig. 1 shows the device as attached to the face of an ordinary wooden window; Fig. 2 is a section on line 2-2 of Fig. 1, but showing the sill; Fig. 3 is a face view of the entire window on a reduced scale; Fig. 4 is a face view of a preferred form of device as attached to a metal window; Fig. 5 is a section on line 5-5 of Fig. 4 but also showing the sill, and Fig. 6 is a section on line 6 6 of Fig. 4.

While `my invention is primarily intended for use with metal windows, its simplest embodiment can best be illustrated in connection with a wooden window, as shown in Figs. 1 and 2. In these figures 2 is a metal plate which may advantageously be made of bronze which is bent over at the top to form a projection 4 and is also preferably bent to form a projection 6 at the bottom. The plate has a cam portion 8 reaching toward the center of the sash (see Fig. The plate is attached to the lift rail 10by a screw 12 which is positioned near the base of the cam portion 8. The bottom projection 6 is so positioned that when the sash is closed it will rest against the sill 14. Two stop pins U -16 and 18 are located in the lift rail 10.

When one starts to open the lower sash the plate 2 will pivot about the screw 12 into the position shown in broken lines in Fig. 1 exerting leverage against the sill 14 caus-A ing the sash to start in motion; The upward movement of the plate 2 relative to the lift rail 10 will be limited by the pin 16 so that the projections 4 will be substantially perpendicular to the operators arms as illustrated in Fig. 3 where the lines of pull are represented by the broken lines 20. As soon as the window is opened to the desired point, plate 2 will drop back into position parallel with the lift rail 10 where it will be held by the pin 18. When the sash is to be lowered, the plate 2 simply remains in this horizontal position.

In Figs. 4, 5 and 6 I show a preferred form of device as applied to a sash and sillw construction similar to that shown in my co-pending application Ser. No. 165,526, filed February 3rd, 1927. In these figures `22 is the lift rail of the lower sash and Attached to theff is the sill (see Fig. 5).

lill) attached to the sash so that their cam ends lift rail 22 is a glass stop 26 bent so that it provides a recess 28. In the recess 28 is attached a support 30 having one end 3 2 bent around so that it is flush with the inner side of the glass stop 2G and the other end 34 bent in and back on itself to `provide -a plate parallel with `the inner face .of the glass stop 26. The support 30 may be held in place in .any .desired way as by a screw 36.

Attached to the end 34 of the `support 30v isa plate 38 provided with a' top projection 40 and a bottom projection 42. This plate is here shown as having a central portion 44 stamped out for the purposes of orna` ment. corresponding tothe cam portion8 already described in reference to Figs. land 2. A`

rivet 48 passes through the plate 384 and the end 34 ofsupport 30. Attached to the back of' the plate 381 in any desired way, as by the 'rivet 50, is astop angle 52.v YVhen the plate 38 is parallel withV the vlift rail, the sto. angle 52` will rest `against the bottom o the recess 28 andy when the plate 38 has reached its position of maximum pivoting movement as illustrated in broken lines kin Fig'. 4, the'stop angle 52 wil;` contact with the top of recess 28. The operation of this form is exactly the same as that already described in connection with Figs. l, 2 and 3.

' If" desired, the type of lift illustrated in Figs. 2, 3 and 4 may be used with a window having a normally flat face on the lift rail, by forming an :appropriate recess therein.`

What I claim is;

Y 1. A windowirame comprising a sill, a sash, a' sash lift pivoted near one of the ends of the lift on the inside of the sash and having a ca-m portion projectingl beyond the pivot point adapted to move downwardly to contact with the sill when the lift is pressed upwardly and stop means for limiti-ng the angular movement of the lift so that it cannot move as much as 45 above the horizontal and cannot 'move substantially 'below the horizontal, so that the same .f

down.

HARRY E. CAMPBELL.

The plate 38 has a cam portion`46- i may be used to move the window both lup and down in the usual manner.

2. A combination as specified 1n claim l which further includes a second similar lift attached to the sash, both said. lifts being are towar'd'the centre.

3. A combination as specified in claim l,

in which a recess is formed in the face of Y the sash back of the Vsash lift and the stop means are adapted to function in said recess.

4. A window-frame comprising a sill, a sash having a lift rail adapted to close against the sill, two members pivoted'to the lift rail approximately in contact withthe sill when the sash is closed, pivotsvconnecting such members with the lift rail, linwardly extending `portions on said members extend-

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