US2752642A

US2752642A - Pivoted double hung window

Info

Publication number: US2752642A
Application number: US317766A
Authority: US
Inventors: Arthur M Starck; William E Gency
Original assignee: AMS CORP
Current assignee: AMS CORP; A M S CORP
Priority date: 1952-10-30
Filing date: 1952-10-30
Publication date: 1956-07-03
Anticipated expiration: 1973-07-03

Description

6 Shets-Sheet 1 July 3, 1956 A. M. STARCK ET AL PIVOTED DOUBLE HUNG wmnow Filed Oct. 50, 1952 7 5 & 0 S M NE 0 m rm W ll 1 7 5 TRC N k 3 NAN a $5.5: 1 g. a 3 m 7 N Z 27 6 H 3 .3 mm W HH- mw W B F A. M. STARCK ET AL 2,752,642 PIVOTED DOUBLE HUNG wmnow July 3, 1956 6 Sheets-Sheet 2 Filed Oct. 30, 1952 Il ll INVENTORS. M. STARCK & E. GENCY ARTHUR WILLIAM .312 Fr. E

PC -E l I I I l l I ATTOQNEYJ' y 1956 A. M. STARCK ET AL 2,752,642

PIVOTED DOUBLE HUNG wmnow 6 Sheets-Sheet 3 A TTUQVEYS.

Filed Oct. 30, 1952 y 3, 1956 A. M. STARCK ET AL 2,752,642

PIVOTED DOUBLE HUNG WINDOW Filed Oct. 30, 1952 s Sheets-Sheet 4 NVENTO s.

sTARc & WILLIAM E. GENCY 2/ BY N FIG. l5. Gan-213m ATTOZNEYJ' l /03-/EE July 3, 1956 A. M. STARCK ET AL 2,752,642

PIVOTED DOUBLE HUNG wmnow 6 Sheets-Sheet 5 Filed 001;. 30. 1952 INVEN M.

TORS. STARCK GENCY &

ARTHUR WILLIAM ATTOF/VEVJ' y 3, 1956 A. M. STARCK ET AL 2,752,642

PIVOTED DOUBLE HUNG WINDOW Filed Oct. 50, 1952 6 Sheets-Sheet 6 I IN VEN TORS'. fiz A37 ART R M. STARCK &

WILL M E. GENCY FIG. 26. 22 1 @122 2% 2,752,642 PIVOTED DOUBLE HUNG WINDOW Arthur M. Starch, Norwalk, and William E. Geucy, Stamford, Conn, assignors to A. M. S. Corporation, South Norwalk, Conn., a corporation of Delaware Application October 30, 1952, Serial No. 317,766 9 Claims. (Cl. 20-49) This invention relates to window constructions. More particularly the invention pertains to improvements in windows of the sliding sash type wherein the sash, mounted to slide vertically, also is pivotally connected near its lower edge so that it can be turned inwardly about a horizontal axis.

This application is a continuation-in-part of our copending application Serial No. 267,410, filed January 21, 1952, patented May 3, 1955, No. 2,707,312.

It has been recognized previously that a window sash which could slide and which also could be turned inwardly would have desirable advantages over a sash which is mounted only for sliding movement, or only for turning movement. A sliding sash is desirable because it permits an unobstructed opening of variable size without projection of the sash into the room or exteriorly of the building wall. Modern sash balances are small in size and inconspicuous, and they permit ready adjustment of vertically sliding sash to any desired position. However, in windows having sliding sashes there is no way of controlling the direction of movement of the air through the opened window except by providing separate deflectors, and it is dangerous and practically impossible to clean the outsides of the windows except from the outside. Previously it has been proposed to make windows in which the sashes are free to slide vertically, and also are pivotally mounted, but the prior constructions have been unsatisfactory or defective in construction or in operation, or have been prohibitively expensiveto manufacture and install, or have been impractical for other rea sons, and none of them ever has come into general or extensive use.

It is an object of the present invention to provide an improved window in which the sash can slide vertically and also can be turned inwardly about a horizontal axis located adjacent the lower edge of the sash. Another object of the invention is to provide a double hung window in which each sash is free to slide vertically and also can be turned inwardly about a horizontal pivotal axis. Still another object is to provide a window in which the sash can be turned about a horizontal axis to a substantially horizontal position for purposes of cleaning, and in which the sash can be easily and quickly adjusted to, and held in, any one of a number of tilted positions intermediate the vertical and the horizontal positions for purposes of ventilation. A further object of the invention is to provide mechanism which will permit a sliding window sash to be turned inwardly about a horizontal axis, and which can be installed in existing double hung windows, as well as in new windows, without substantial. modification of the conventional sliding sash window frame, or of the sashes themselves. It also is an object of this invention to provide a mechanism of the character described which i is economical to manufacture and install, and which is foolproof in operation. Still another object of the invention is to provide mechanism of the character described which embodies concealed spring sash balancing mechanism, and which is compact in size. .Other objects 2,752,642 Patented July 3, 1956 and advantages of the invention will appear hereinafter.

A preferred embodiment of the invention selected for purposes of illustration and description is shown in the accompanying drawings, wherein:

Figure 1 is a front view of a double hung window taken from the inside looking out;

Figure 2 is a horizontal section, to larger scale than Figure 1, through one side edge of the upper sash and the adjacent portion of the window frame taken substantially on the line 22 of Figure 1;

Figure 3 is a similar view through one side edge of the lower sash and the adjacent portion of the frame taken substantially on the line 3-3 of Figure 1;

Figure 4 is a vertical section through the window, normal to the plane of the window, showing both sashes tilted inwardly about their pivotal axes;

Figure 5 is a perspective view showing a detail of the connection of the sash balance to a sash;

Figure 6 is a vertical section, normal to the plane of the window, through one of the slides attached to a side edge of a sash, showing the mechanism for holding the sash in a closed vertical position, and in tilted open position;

Figure 7 is a vertical section through the slide and mechanism of Figure 6 taken substantially on the line 77;

Figure 8 is a vertical section taken substantially on the line 8-8 of Figure 7;

Figures 9, 10, 11 and 12 are fragmentary vertical sections taken substantially on the line 99 of Figure 7, but showing the mechanism for position in different the operation of the Figure 13 is a diagrammatic view showing how the. sash is operated manually to adjust it to the desired tilted trons similar to Figure 15, but showing the mechanism disclose the operation of the mechanism;

Figure 21 is a fragmentary vertical section through the mechanism taken substantially on the line 21-21 of Figure 15;

Figure 22 is aperspective view of a modified arrangement for securing the upper ends of the sash balances to the window frame;

Figure 23 is a perspective view of a modified arrangement for connecting the lower end of the sash balance to the lower sash;

Figure 24 is a perspective view of a ment for connecting the lower end of the sash balance to the upper sash;

Figure 25 is a fragmentary elevation looking toward a jamb of the window showing means for preventing passage of air at the side edges of the sashes where they overlap when in closed position; and

Figure 26 is a sectional view taken substantially on the modified arrangewindow frame 15 is prosashes is omitted. In new constructions it will not be necessary to provide channels in the jambs for parting beads. In the illustrative embodiment a wooden frame is shown, but it will be obvious that the invention can be used also in windows having metal frames. The sashes are of the usual construction except that about half an inch is trimmed oif from the edge of each stile to make the sashes slightly narrower than would be required for mounting them in the frame in the conventional way. The reason for trimming the sash stiles will be evident as the description proceeds.

Figures 2, 3 and 4 show the mechanism for mounting the sashes in one side of a frame- -the right hand side as viewed in Figure l. It will be understood that similar mechanism is provided at the other side of the frame and is similarly connected to the frame and to the sashes, corresponding parts being similarly numbered with the addition of a prime mark. This mechanism permits the sashes to bemoved vertically, and also to be turned inwardly about horizontal axes adjacent the lower edges of the sashes.

, Referring to Figures 1-4, secured to the jamb 18 of the window frame, between the inner bead 19 and the outer bead 20, and to the opposite jamb, are frame channel. members providing two pairs of opposed runways extend ing the full height of the frame. Conveniently these vertical runways are formed by an upper frame channel member'21 which is substantially coextensive with the edge of the upper sash when in its raised position, and two parallel lower

frame channel members

22 and 23 which are generally G-shaped in transverse section and are substantially coextensive with the side edge of the lower sash when it is in lowered position. The frame channel members are made of metal and their conformations are such that they can be rolled readily from sheet metal, for example zinc, aluminum, steel, or other suitable metal. The overall dimensions of the parallel lower frame channel members are similar to the overall dimensions of the upper frame channel member. The upper frame channel member and the parallel lower frame channel members are arranged in end to end relation and provide continuous parallel runways at each side of the frame of sash slides. Conveniently the frame channel members will be secured to the jamb of the frame by nails or screws 24.

Mounted in the runway provided by the lower frame channel member 22 and the aligned channel of the upper frame channel member 21 is a hollow slide 25 which is coextensive with the stile of the lower sash'17. Mounted in'the parallel runway is a hollow slide 26 which is coextensive with the stile of the upper sash 16. As can be seen in Figures 2 and 3, the

slides

25 and 26 are formed with longitudinal flanges 27 and 28, respectively, which engage reentrant channels in the runways to prevent transverse movement of the slides relative to the frame channel members, while permitting free movement of the slides vertically in the runways.

Each of the

slides

25, 26 is provided, adjacent the stile of the associated sash, with a longitudinal slot facing toward the inside of the window, the purpose of which will appear as the description proceeds. In the slide 25 this slot is located at the corner of the slide diagonally opposite the longitudinal flange 27. In the slide 26 the slot is located at the adjacent corner on the narrower edge ofthe slide. preferably is formed also with a longitudinal flange 29, parallel to the plane of the window and diagonally opposite the flange 28, against which the stile of the upper sash lies when the sash is in its closed vertical position. The purpose of the flange 29 is to serve as a stop for the upper sash when it is turned from tilted position back to vertical position, and also to limit passage of air between the edge of the sash and the slide 26. The

slides

25 and 26 may be rolledv from sheet metal.

As can be seen in Figure 2, the slide 26 I The lower sash 17 is pivotally connected to the slide 25 adjacent the lower edge of the sash. In order that the lower sash may be tilted inwardly without first being raised to clear the top of the sill, the pivotal axis preferably is spaced a short distance above the top of the sill and a short distance on the inner side of the sash. This is shown in Figures 1-4, where a hinge plate 30 secured to the lower end of the slide 25 is connected by a hinge pin 31 to a hinge plate 32 secured on the side edge of the sash at the lower end of the stile. The lower sash can be turned inwardly about the pivotal axis through the aligned hinge pins 31, 31'.

Secured on the side edge of the lower sash stile, and

' substantially coextensive therewith, is a channel-shaped I ,plate 32 can be permanently secured thereto,

'ing or riveting.

member 33. This channel-shaped member conveniently is secured to the stile by nails or screws extending through the flanges thereof into the stile. As can best be seen in Figure 3, the channel-shaped member 33 is provided with a longitudinal lip or flange 34 which is parallel to the web of the channel-shaped member and spaced at short distance laterally therefrom. This lip 34 engages the inwardly facing longitudinal slot in the slide 25 when the lower sash is turned to its closed vertical position. Preferably the lip 34 engages the side walls of the slot with a fit which prevents substantial passage of air between the channel-shaped member 33 and the slide 25, but which will not interfere with the free turning of the sash about its pivotal axis when it is desired to tilt the sash inwardly.

The lower end of the lip 34 terminates at the top of the hinge plate 32, so as to permit turning the sash inwardly. The channel-shaped member 33 preferably is rolled from sheet metal, and for convenience in installation the hinge as by weld- Pivotally connected to the side edge of the lower sash, spaced above the hinge plate 32, is one end of a link 35. In the illustrative embodiment this connection is made vapproximately one-third of the way up from the bottom "edge of the sash,

but this distance may be varied. 'Conveniently the connection is made by a screw or rivet to the channel-shaped member 33, or to a reinforcing plate associated therewith. In the embodiment illustrated in Figures 2-4, a screw 36 engages an internally screw- "threaded collar 40 secured 1B within the slide.

the web of the member 33.

The other end of the link 35 extends through the longitudinal slot in the slide 25 and is pivotally connected to the web of a channel-shaped runner 37 slidably mounted Conveniently this connection is made by means of a pin 38 which is secured in the end of the link and which pivotally engages a round hole in the web of the runner. In assembling the mechanism the pin 38 will be inserted in the hole in the runner before the' runner is pushed in one end of the slide, and since neither I .longitudinal axis of 37 substantially at the link nor the Irunner is free to move laterally in the assembly, this relation of the parts will be maintained as the runner moves longitudinally within the slide.

The side wall of the slide 25 facing the side edge of the transverse slot 39 to receive the turned to its closed vertical position. When the sash is in-vertical position the link 35 will lie completely within the hollow slide 25, with the longitudinal axis of the link substantially parallel to the the slide. Figure 6 shows the runner the upper limit of its range of movement within the slide, but merely for purposes of providing a clearer disclosure of the connection of the link to the runner, the link is shown at an angular position which is ditferent than it occupies when the mechanism is at tached to a window and the runner is in the position shown. I 7

It will be evident from the foregoing description and from inspection of Figure4 that as the lower sash 17 is tilted inwardly about its pivotal axis, the link '35 will cause the runner 37 to move downwardlyin the slide, and that as the sash is tilted back toward the vertical position i check turns, the ear 58 moves from the curved portion of the spring 53 to the straight end portion thereof, substantially as shown in Figure 9. Upon reversal of the sash tilting movement, the runner 37 will again move downwardly in the hollow slide 25 and the check will be held by the spring 53 in its counter-clockwise position, so that the lug 57 now clears the lower edge of the notch 60.

Continued downward movement of the runner 37 brings the ear 58 of the check into engagement with the lower edge of the notch 66, which first causes the check to turn in a clockwise direction until the lug 57 engages the edge of the rack 50, as shown in Figure 10, and then causes the pivot pin 76 of the check to be moved to the right in the transverse slot 52, to the position shown in Figure 11. The downward movement of the runner will be halted when the lug 57 engages the lower edge of the third notch 61, as shown in Figure 12. In the absence of further action by the operator the sash l7 will be held in its second tilted position.

Additional notches 62 similar to 60 and 61 may be provided spaced along the edge of the rack 50 to permit adjustment of the sash to other tilted positions, and the spacing between notches can be made as desired. Upon tilting the sash inwardly it will be locked successively in open positions as. determined by these notches in the rack, tilting of the sash from one open position to the next open position being made possible merely by a short reversal of the tilting movement at each locked position. This is illustrated somewhat diagrammatically in Figure 13, where the lower sash is shown by solid lines in one of its locked tilted positions. Upon tilting the sash toward the vertical through the small angle a, the check 51 is turned and held so as to permit tilting the sash inwardly through the angle b to the next locked tilted position, shown in dotted lines.

The spring 55 desirably presses the flange of the runner 37 against the flanged back edge of the rack 50 with sufficient force to serve as a brake and retard tilting movement of the sash inwardly under its own weight, or under the pressure of the wind, and to prevent rebounding of the sash upon engagement of the lug 57 with the lower edge of a notch in the rack. Otherwise the sash, tilting inwardly under its own weight or under the wind pressure, might rebound sufliciently to cause the check to turn far enough in a counter-clockwise direction to permit further tilting of the sash, and this operation might be repeated as successive notches of the rack were reached by the check, until the tilting movement was stopped by some other means.

Desirably, when the sash is tilted inwardly to a substantially horizontal position the runner 37 will be locked against further downward movement within the slide 25 so as to minimize danger of damage to the sash, and also to prevent any possibilityof the runner moving completely off from the lower end of the rack 50. This object can be attained, for example, by providing the rack with two closely spaced, V-shaped

notches

63 and 64 toward its lower end, as shown in Figures 6 and 8. When the runner 37 is moved downwardly until the ear 58 of the check 51 overlies the notch 63, the spring 53 will press the pivot pin 76 of the check to the left and the ear 58 will drop toward the bottom of the notch 63. Upon continued downward movement of the runner, engagement of the ear 58 with the lower edge of the notch 63 will cause the check to turn in a clockwise direction and will move the lug 57 into engagement with the lower edge of the notch 64, halting further downward movement of the runner. Upon slight reversal of the tilting movement of the sash, engagement of the ear 58 with the top edge of the notch 63 will lift the lug 57 from the notch 64. However, if the sash is again .tilted inwardly, engagement of the ear 58 with the. lower edge of the notch 63 will once again turn the check in a clockwise direction to bring the lug 57 back into engagement with the lower edge of the notch 64. Consequently, the runner is unable to move downwardly beyond the point where the lug 57 engages the notch 64.

From the foregoing it will be evident that the sash 17 may be tilted inwardly, step by step, from a vertical position to a horizontal position merely ing movement slightly when the sash reaches each locked tilted position. Alternatively, the sash may be left in any one of the locked tilted positions, as desired, for purposes of ventilation. The sash may be turned from any tilted position to its closed vertical position in a single continuous movement, he ear 58 of the check dropping successively into the notches of the rack 50 and sliding up the gradually sloping upper edges thereof.

Any attempt to move the sash 17 in a vertical direction while the sash is tilted inwardly would be likely to result in uneven vertical movement of the hollow slides in their-runways at the opposite edges of the sash, with the possibility of damage to the mechanism connecting the sash to the slides. In order to obviate this danger, mechanism is provided which operates automatically, regardless of the vertical position of the slides 25 in their runways, when the sash is tilted inwardly from its vertical position to lock the slides against vertical movement in their runways.

Pivotally mounted on a stud secured in the stop 42 is a pawl 65, shown as a cam pawl, with which is associated a spring 66. This spring biases the pawl about its pivotal axistoward the edge of the slide 25 which faces the inner head 19 of the Window frame. Located in the wall of the hollow slide 25 opposite the pawl is an opening 67. When the sash 17 is in its closed vertical position, the runner 37 will be at the upper limit of its range of movement, as shown in Figures 6 and 7, and one of the side flanges of the channel-shaped runner engages the cam end of the pawl to hold it, against the pressure of the spring. 66, clear of the opening 67. As soon as the sash is tilted inwardly, the runner 37 moves downwardly in the slide 25 and the end of the pawl, no longer restrained by the flange of the runner, is pressed outwardly by the spring 66 through the opening 67 into engagement with the edge flange of the upper frame channel member 21, which is backed up by the inner head 19. Engagement of the end of the spring-pressed cam pawl with the frame channel member serves to lock the slide against vertical movement. Figure 8 shows the pawl extending outwardly through the opening 67 in the wall of the slide.

When the sash 17 is returned from tilted position to its vertical position the runner 37 moves upwardly in the slide 25, and as the runner nears the upper limit of its range of movement wi'hin the slide the runner flange engages the cam edge of the pawl 65 to turn the pawl, against the pressure of the spring 66, back into the slide, thus freeing the slide for vertical movement in its runway. Figure 9 shows the pawl partially freed from the flange of the runner.

The upper sash 16 has mechanism connecting its side edges to the slide 26, and to a similar slide at the opposite edge of this sash, which corresponds in all essential respects to the mechanism which has been described in connection with the lower sash 17. One diiference is that the pivotal axis of the upper sash extends through the lower edge of the sash rather than being displaced on the inner side of the sash. The upper sash can be tilted inwardly to horizontal position, or can be selectively adjusted to intermediate tilted position between the vertical and the horizontal. Obviously, the upper sash can be tilted inwardly only after the lower sash has been tilted inwardly at least part way, but otherwise either sash may be tilted independently of the other. Also, in the illustrative embodiment, the upper sash can be tilted only after it has been lowered at least slightly to permit access to the latch members which are of the slides and which lock the sash in vertical position.

It will be evident that the lowersash can be raised to by reversing the tilt-v located in the upper ends the link will move the runner upwardly in the slide. By- The check 51 has secured thereto a pivot pin 76 which providing means for selectively locking the runner in 8. extends through a transverse slot 52 in the web portion plurality of adjusted positions within the slide it is posofthe runne The end of this pivot pin opposite the sible to hold the sash in a plurality of tilted positions. check is headed as shown at 77 in Figure 6, so as to hold The construction and operation of the mechanism for the pin in the slot 52. The check 51 has a limited locking the lower sash 17 in closed vertical position, and freedom of turning movement about the axis of its pivot of the mechanism for selectively locking the runner 37 pin 76 and also is free to move transversely relative to in an adjusted position within the hollow slide 25 when the runner within the limits imposed by the slot 52. The the slide is tilted, will next be described, reference being end of the check opposite the pivot pin is formed with a had particularly to Figures 6-13 of the drawings. 10 transverse lug 57 for engaging the notched edge of the Secured within the upper end of the slide 25, as by rack 50, and formed on the side of the check toward the screws or rivets 41, is a stop 42. Conveniently this stop rack is a transverse ear 58 which also engages the notched is formed from a cruciform piece of sheet metal, such as edge of the rack 50 and serves simultaneously as aispring steel, the vertical bar of the cross being substantially longer stop. than the horizontal bar. The ends 43 of the horizontal The check 51 is resiliently pressed toward the notched bar are bent at 90 with respect to the plane of the central edge of the rack 50, as by a coil spring 53 surrounding portion, and when the stop is inserted telescopically into the headed stud 54 projecting from'the web of the runner the upper end of the slide 25 the flanges formed by the 37. One of the uncoiled ends of the spring engages the bent ends 43 serve to position and hold the stop against id flange f the runner 37 opposite the rack 50, and transverse movement Within th lid the other uncoiled end of the spring, curved as shown seemed to the pp end of the p 42 is a p g in the drawings, engages the ear 58 on the side of the pressed latch for holding the sash 17 in closed vertical check, thus pressing the check to the left, as viewed in position. In this illustrative embodiment the upper end Figures 8-12, agai t the notched edge of the rack. 44 of the vertical bar of the cross also is bent at 90 with Th o he id flange of the runner 37 is free to slide respect to the plane of the central portion to form a horialong the flanged back edge of the rack 50 and is held ZOHIQl flange. The flange 44 has a hole drilled centrally firmly against the back edge f the rack by the pring 55, therelhfough To receive SlidtlblY P The P 45 the central portion of which is looped around the headed has a head on its lower end which llmits its movement d 56 projecting f om the web of the runner, and the p y through the hole n the flange The p p curved ends of which bear resiliently against and ride leeting above the flange 441-5 Surrounded y COmPIeSSiOII along the inside of the flange at the back edge of the coil spring and the pp end of the P is Seemed, rack. Pressure of the runner flange against the flanged as y riveting, to a latch member 47 which is telescopically back edge of the rack acts as a brake to retard movement received within the upper end of the slide 25. The coil of h runner along th rack,

Spring 46 resiliently Presses the latch member 47 p y The operation of the mechanism for selectively locknt l t e head On the lower end 0f the P 45 engages the ing the sash in adjusted tilted position will now be defienge 44, and When lhe p 42 is Secured in Positien in scribed in connection with Figures 8-12, and references Lhe Slide y the Screws 41, the pp end of the latch herein to right or left, and to clockwise or counmembel p l Slightly above the p end of the Slide ter-clockwise will be understood to apply to the mech- The latch member 47 conveniently is formed from sheet anism as i w d i th fi ure metal, pp sideedses thereof being bent Q When the sash 17 is in closed vertical position, the to P P flanges for ellgfllngfhe latch member WltlHH runner 37 will be at the upper limit of its range of movethe sllde: and the pp edge being at Q Provide ment within the slide 25. The pivot pin 76 of the check a Closure for the pp end of the slldel q s 51 will be pressed toward the left end of the transverse y from e latch member through an P slot 52 by the spring 53; the ear 58 of the check will rest wall of the sllde 25 facing the edge of the sash stlle 1s a 45 in. the uppermost notch 59 f he k d h h k Cat h 48- COIlVeIlleIlllY the Catch 15 formed mtesrally will be turned in a counter-clockwise direction, by reason with the latch member as shown. When the sash 17 is f engagefnent of the ear in Vertical Pesltlen l catch 43 engages a Q 49 notch, until the end of the check rests against the side ure 4, and also see Figure 25) secured to the side edge of flange f the runner 37 the Sash Stile at l pp end to e the Sash SO P 1t 50 When the latch member 47 is depressed to release the cannot be tilted inwardly. When it is desired to tilt the Catch 48 frcm the hook 9 and the h is il i sash inwardly the operator merely depresses the latch wardly fr its member 47 sllghfly ilgamst the Pressure of the col] spnng runner 37 downwardly in the hollow slide 25, and engagefhlls freemg the celeb 43 @0111 the hook P ment of the ear 58 with the lower edge of the notch 59 mlltlng the Sash to bell-lined inwardly ebout ltsfwotal 5 first turns the check in a clockwise direction until the axis. When the sash 1s returned from tilted position to lug 57 engages the slopingupperedge f the second notch vertical position, the oblique end of the hook 49 engages 69. As the runner continues to move downwardly, the

thefatch 4s and Pmsses the mefnber downwardly ear 5S rides up the sloping lower edge of the notch 59, against the pressure of the spring until the hook passes moving the pivot pin 76 of the check to the right until Over the Catch and the membefs 0 the ear 58 clears the top of the tooth separating the Secured to the lower end or the vertical bar of the stop notches 59 and Upon continued downward move 42 is a guide bar 50 which extends longitudinally downwardly within the slide and along which the runner 37 can move vertically within the slide. This member 50 ment of the runner, the lug 57 engages the sloping lower end of the notch 60, substantially as shown in Figure 8,

is a notched bar rack. In the illustrative embodiment the Without further action by the operator the Sash 17 W111 rack 50 terminates at short distance below the transverse be held in its first tilted position Slot 39 in the slde WanPf the Slide, but the lengthpf the If it is desired to tilt the sash inwardly a greater dis- Tack y y dependmg on the length of the llnk 35 tance, this can be done merely by tilting the sash back and its point of connection to the sash stile. The rack 50 h h a small angle toward h vertical, and then again will e f s fi i length to permit turning the sash tilting the sash further away from the vertical. As the inw r ly to substantially horizontal position Th r k sash is tilted back toward the vertical from the position 50 cooperates with a spring pressed check 51 mounted on shown in Figure 8, engagement of the ear 58 with the the runner 37 to selectively lock the runner in adjusted upper edge of the notch 60 causes the check 51 to turn position along the rack within the slide 25, so as to hold in a counter-clockwise direction until the end of the check the sash in the desired tilted position. e s g in t i ng i e .l 'v A he menace;

any desired position before being tilted inwardly, and that the upper sash can be lowered: as desired beforebeing tilted inwardly.

The sash balances which permit thesashes to beadjnsted to described. The sash balances disclosed are of the coil spring type in which the balancing action results from turning the spring. The mechanism at one side of" the window will be described and it will. be understood that similar mechanism is provided at the opposite side of the window.

Located within the upper frame channel member 21 are two parallel coil springs 68, 69-, the upper ends of which against rotation and against movement lonof the springs, into the jamb 18. These coil springs are approximately coextensive with the frame channel member 21. Secured on the lower ends of these coil springs 63', 69 are slotted bushings which receive the twisted or spiral rods 70, 71, respectively. The lower end of the twisted rod 70 is connected by a link 72 ex. tending outwardly through the longitudinal slot in the G-shaped lower frame channel member 22 to the lower end of the slide 25. The lower end of the twisted. rod 71 is similarly connected by a link extending outwardly through the longitudinal slot in the G-shaped lower frame channel member 23 to' the lower end of the slide 26.

As either sash is raised or lowered, the spiral rod connected to the sash slide will move vertically through the slotted bushing in the lower end of its associated coil spring. The coil spring will be twisted tighter as the sash is lowered, thus tending to raise the sash, and the tension in the spring will be relieved as'the sash is raised.

It may be desirable to limit the downward movement of the upper sash and this can be done by providing a stop 73 located in the lower frame channel member 23, near its lower end.

A modified form of mechanism. for holding the sash in closed vertical position and for selectively locking the sash in adjusted tilted position will now be described. This modification, shown in Figures 142'l, provides some simplification in manufacture.

Referring to Figures 14-21, the hollow slide 75 is similar to the slide 25 described hereinabove. The slide 75 will be mounted in the. vertical runway provided at the side of the window frame by the frame channel members, and at its lower end will be pivotally connected. to the sash 17' adjacent the lower edge of the sash. Secured within the upper end of the slide 75, as by one. or more rivets or screws 81, is a stop 82. This stop, quite similar to the stop 42 in slide 25, conveniently is formed' from a cruciform piece of sheet metal. The ends 83' of the horizontal bar of the cross. are bent at 90 with respect to the plane of the central portion to provide vertical flanges which serve to position and hold: the stop against transverse movement when it is inserted telescopically intothe upper end of the slide 75. The upper end 84 of the vertical bar of the cross 82' also is bent: at 90 with respect to the plane of the central portion to form a horizontal flange. This flange interlocks with the latch member 87, which is telescopically received in the upper end of the slide 25, and serves to hold the latch member in the slide.

The latch member 87 conveniently alsois formed. from a cruciform piece of sheet metal, two opposite side. edges thereof being bent at 90 to provide vertical flanges for aligning the latch member within the slide, the upper edge being bent at 90 to provide a closure for the: upper end of the slide, and the lower edge being bent at 90 toprovide a horizontal flange which, in. the assembled;

structure, faces and lies under the upper flange 84 of" the stop 82'.

A bent compression spring; 86 formedi from a. strip her, and the lower end of the spring presses against. the

top surface of the flange 84 of the:

member 37 is pressed: downwardly, to permit tilting the window inwardly, the spring 86 folds about; its mid. poin It is not necessary to fasten the spring; within the latch member, the pressure of the spring against the upper' and side flanges of the latch member and against the flange. 84 of the stop 82 serving to hold the parts in position during assembly and thereafter.

Projecting laterally from. the latch member 87 is a catch 88, conveniently formed as an integral. part of the latch member.. This catch engages the-hook 49 (Figure 4).,.whe11 the. sash is in vertical position, to lock the sashagainst tilting movement. When it' isdesired to tilt the sash inwardly the operator merely depresses the latch member 87 slightly against the pressure of the spring 86, thus freeing. the catch 88 from the hook 49-. For convenience in assembling. the parts, the wall of the hollow slide member facing the edge of the sash may be made: slightly lower than the other walls of the slide.

Secured to the lower end of the vertical bar of the stop 82' is a guide bar 90' extending downwardly within the hollow slide 75 and along which the channel-shaped runner 93 can move vertically within the slide. guide bar is a notched bar rack, angular in transverse section, and corresponds generally to the bar rack 50 in the embodiment of Figures 6l2. This bar rack cooperates with the mechanism which will be described to lock the runner 93 in adjusted vertical position within the slide, so as to hold the sash in the desired tilted position.

The runner 93 corresponds to the runner 37 in the embodiment first described. As inthe other embodiment, one end of the link 35 extends through the longitudinal slot in the slide, and the other end is pivotally connected to the side of the sash. The pin 38 secured in the end of the link within the slide extends through the oblique slot 94, which extends across the web of the runner 93. When the sash 17 is tilted inwardly about its pivotal axis, the link 35 will cause the runner 93 to move downwardly in the slide 75, and when the sash is tilted back toward the vertical position the link will move the runner upwardly in the slide.

To serve as a brake and retard movement of the runner longitudinally within the slide, spring means are proback of the bar rack.

In the following description of' the mechanism for locking the runner 93 in adjusted position within the slide 75, references to right and left will be understood to apply to the mechanism as viewed in Figures 14 and 17-20:

Positioned between the side flanges of the runner 93, in back of the spring 95 and the notched bar rack 90, and lying against the web of'the runner, is a diagonally slotted plate 91. The ends of the slot 92 are somewhat wider than the intermediate portion and are rounded. The righthand side of the 'slot is tangent to the rounded ends, whereas the other side intersects the rounded ends to provide the

lips

96 and 97, as can best be seen in Figure 16. This plate 91 has a transverse ear 98, preferably formed as an integral part of the plate by turning up a corner portion thereof as shown. This car projects outwardly from the plate beyond the notched edge of the bar rack and rides along the notched edge as the runner is moved up and down in the hollow slide. In the assembled mechanism the pin 38 secured in the end of the link 35 extends through the slot 92 in the plate 91 and projects beyond the notched edge of the bar rack 90, so that it also rides along or adjacent the notched edge of the bar rack as the runner is moved up and down in the hollow slide.

It will be evident from the foregoing description that the mounting of the diagonally slotted plate 91 in the runner 93 is a floating one. The plate 91 has a range of horizontal movement relative to the runner which is limited by engagement of its side edges with the opposite side flanges of the runner, the movement of the upper end of the plate to the left being further limited by the engagement of the ear 98 with the notched edge of the rack bar, resulting in a tilting of the plate at certain stages in operation of the mechanism. The plate 91 also has a range of vertical movement relative to the runner, sliding up or down on the pin 38 as this pin moves in the oblique slot 94 in the web of the runner, as the sash is tilted.

When the sash is in closed vertical position, the runner 93 will be in its uppermost position in the hollow slide 75, and the upper ends of the side flanges of the runner will abut, or be in close proximity to, the lower ends of the flanges 83 of the stop 82. The pin 38 will be pressed toward the right in the oblique slot 94 in the web of the runner, holding the righthand edge of the diagonally slotted plate 91 against or near the righthand flange of the runner.

As the sash is tilted inwardly, the link 35 pulls the pin 38 downwardly and toward the left. The pin 38 slides to the left in the oblique slot 94 until it engages the edge of the notched bar rack 90 at a point intermediate the

notches

99 and 100. The plate 91 drops, under the influence of gravity, with the pin 38 and also is carried to the left by engagement of the pin with the lip 96, causing the car 98 to catch on the lower edge of the top notch 99. This holds the plate against further downward movement at this stage. As the sash is tilted further, the pin 38 continues to move downwardly along the edge of the bar rack. The runner 93 is carried downwardly by the pin 38, and the pin is directed by the pull of the link 35 and by the slot 92 in the now stationary plate '91 into the notch 100 of the bar rack, substantially as shown in Figure 14. This halts the downward movement of the runner 93 and without further action by the operator the sash will be held in its first tilted position.

If it is desired to tilt the sash inwardly a greater distance, this can be done merely by tilting the sash back through a small angle toward the vertical, and then again tilting the sash inwardly. As the sash is tilted back slightly toward the vertical from the position shown in Figure 14, the runner '93 remains stationary, held frictionally against the 38 moves to the right in the oblique slot '94 and, as it does so, forces the plate 91 to the right until the ear 98 clears the lower edge of the notch 99, permitting the plate to drop, under the influence of gravity, sition shown in Figure 17. The relation of the parts now is the same as before the tilting operation was initiated, except that the runner 93 is farther down on the notched bar rack 90.

As the sash'is again tilted inwardly, the pin 38 engages the lip 96 of the plate 91,.pressing the plate to the'left.

bar rack by the spring 95. The pin X to the pohand corner ofthe plate with similar in operation from the edge of the slide.

This movement of the plate will belimited by engagement ofthe car 98 with the edge of the bar rack between the notches 99 and and, as the plate tilts in a clockwise direction, by engagement of the lower leftthe adjacent side flange of the runner 93. As thetilting of the sash is continued, the runner 93 is-rn'oved downwardly in the slide 75, the ear 98 moves down into the second notch 100 on the bar rack, and the pin 38 engages the edge of the bar rack between the

notches

100 and 101. Upon continuation of the tilting movement, the pin 38 rides downwardly along the unnotched portion of the bar rack, and the car '98 catches 'on the lower edge of the notch 100. This condition is shown in Figure 18. As the tilting of the sash continues, the plate 91 is held stationary until the pin 38 passes over the lip 96, and then engagement of the pin 38 with the righthand edge of the slot 92 moves the plate to the right until the car 98 clears the lower edge of the notch 100, permitting the plate to move downwardly, under the influence of gravity, with the pin 38 and the runner 93. This is the condition shown in Figure 19. When the pin 38 reaches the notch 101, the link 35, urging the pin downwardly and to the left, pulls the pin into this notch, thus halting the tilting movement of the sash. This is the condition shown in Figure 20, and in the absence of further action by the operator the sash will be held in its second tilted position.

Additional notches similar to 100 and 101 may be provided, spaced along the edge of bar rack 90, to permit adjustment of the sash to other tilted positions, and the spacing between notches can be made as desired. Upon tilting the sash inwardly it will be locked successively in open positions as determined by these notches in the rack, tilting of the sash from one open position to the next o en position being made possible merely by a short reversal of the tilting movement at each locked position.

When the pin 38 reaches the bottom notch 102, the sash preferably will be in a horizontal or nearly horizontal position, thus making it easy to wash the outside of the glass. Tilting of the sash down beyond this position may be prevented by providing a stop on the bar rack which prevents further downward movement of the runner 93 in the hollow slide 75. As shown in Figure 14, near the bottom of the bar rack a lip 103 is pressed outwardly from the flange at the back edge of the bar rack. This lip engages the lower end of the lefthand side flange of the runner when'the pin 38 is in the bottom notch 102 and prevents further downward movement of the runner.

The sash may be turned from anytilted position back to its closed vertical position in a single continuous movement. During this movement the link 35 presses the pin 38 to the right in the slot 94 in the runner. The pin 38 presses the plate 91 against the righthand side flange of the runner, and the pin and the ear 98 on the plate both are held out of engagement with the notched edge of the bar rack.

Figures 14, 1S and 17-19 show mechanism for locking the hollow slide 75 against vertical movement in its runway when the sash is tilted inwardy. This mechanism is to that disclosed in the embodiment of Figures 6-12, but differs in the construction of the pawl. Pivotallyv mounted on a stud secured in the stop 82 is a pawl 105, formed from sheet metal. The spring 106 biases the pawl about its pivotal axis toward the edge of the slide 75 which faces the inner bead of the window. When the sash is in its closed vertical position, the lefthand side flange of the runner 93 overlies and holds the end of the pawl, against the pressure of the spring, away When the sash is tilted inwardly the runner is moved downwardly, and the end of the pawl is released through the opening 107 in the edge of the slide to engage the edge flange of the frame channel.

Figure 23 shows a bracket for pivotally connecting the link 35 to the side edge of the sash in such a manner as to make it unnecessary to provide the transverse slot 39 in the side wall of the slide 75 facing the edge of the sash. This bracket conveniently is formed from a piece of sheet metal folded and bent substantially as shown in the drawing. Portion 108 of this bracket is secured, as by rivets 109, to the inside of the web of the channel-shaped member 33, facing the edge of the sash. The fold 110 extends through an opening in the web and is offset so as to lie in the plane of the longitudinal lip 34 on the channelshaped member. The link 35 is pivotally connected to the offset fold as by a rivet 111, the end of the link 35 lying between the lip 34 and the web of the channelshaped member. When the sash is in closed vertical position, the offset fold 11% extends through the inwardly facing longitudinal slot in the hollow slide 75, and the link 35 will lie completely within the hollow slide.

Figure 23 also shows a modified form of hinge plate for closing the lower end of the slide 75 and for connecting the lower end of the slide 75 to the hinge plate 32 secured on the side edge of the sash 17 at the lower end of the stile. This hinge plate 112, pivotally connected to the hinge plate 32 by the hinge pin 31, conveniently may be formed from sheet metal. The hinge plate is located inside the hollow slide 75, at its lower end, and conveniently is secured thereto by one or more rivets 115. The hinge plate 112 has an offset ear 113 formed integrally therewith which projects outwardly through a slot in the lower end of the slide and extends through the longitudinal slot in the G-shaped lower frame channel member for connection to the lower end of the twisted rod 70 of the sash balance. The lower end of the twisted rod is bent back on itself to form a loop 114 which is merely slipped over the end of the ear 113 during the installation of the window. The car 113 is made long enough, relative to the dimension of the frame channel members.

Figure 24 shows a closing the lower end modified form of hinge plate for of the hollow slide 26 and for pivotally connecting the lower end of this slide to the side edge of the upper sash 16. This hinge plate 116, conveniently formed from sheet metal, is located inside the hollow slide 26, at its lower end, and may be secured thereto by one or more rivets 117. The flange 118 closes the lower end of the hollow slide, and projecting downwardly therefrom is the car 119 for making the pivotal connection to a hinge plate which will be secured to the side of the sash and project downwardly beyond the lower end of the stile. The ear 120, formed as an integral part of the hinge plate 116, projects outwardly through a slot in the lower end of the hollow slide 26 and extends slot in the associated G-shaped ear 120 and the twisted rod 71 is similar to that shown in Figure 23.

Figure 22 discloses means for securing the upper ends of the coil springs 68, 69 against rotation and against longitudinal movement within the upper end of the upper frame channel member 21. This means 121 conveniently may be formed from sheet metal and is merely slipped into the upper end of the frame channel member during installation of the window. The flanges 122 rest on the upper end of the frame channel member 21 to prevent it from being pulled down into the channel member. The upper ends of the coil springs are formed with loops or slots which are slipped over the integrally formed ears 123 on the member 121 during the installation of the window. These ears 123 extend transversely of the frame channel member 21 to the jamb of the window frame, so that in the assembled structure there is no possibility of the springs slipping off from the ears.

14 One of the problems in designing window sashes which can be adjusted vertically and members into the stiles. tect'ed against the weather by the channel-shaped members, which are reinforced by the stiles, and the webs of the channel-shaped members facing the hollow slides are smooth and free from projecting nail or screw heads. This latter condition permits a close sliding fit between the web of the channel-shaped member and the opposing face of the associated slide.

Each of the channel-shaped members 33 is provided formed longitudinal lip or flange 34 thereof and spaced a short distance When the lower sash is tilted to vertical position this lip 34 engages the longitudinal slot in the lower sash slide, as shown in Figure 3. When the upper sash .is tilted to vertical position the corresponding lip lies between the free edge or lip along the longitudinal slot in the upper sash slide and the oppositely disposed wall of the frame channel member, as shown in Figure 2. Preferably the free edges or lips of the slides engaged between the lip 34 and the web of the member 33, when the sashes are tilted to vertical position, are bent slightly toward the sash stiles, as shown at 124 in Figure 423 for the lower sash slide, and at 125 in Figure 24 for the upper sash slide. This conformation of the slide lips provides a slight wedging action as the lip on the slide enters between the lip 34 and the web of the member 33 and insures a fit which prevents the passage of air at the side edges of the sash. Suitable conventional weather stripping may be employed at the bottom rail of the lower sash and at the top rail of the upper sash if desired.

Figures 25 and '26 disclose weather-stripping means for preventing passage of air in a vertical direction between the frame channel members and the channel-shaped members secured on the side edges of the sashes at the place where the sashes overlap slightly when both sashes are closed. The central raised portion of each upper frame channel member 21 is provided, near its lower end, with a transverse pad 126. When both sashes are closed, the ends of the upper rail of the lower sash and the ends of the lower rail of the upper sash lie opposite these pads. The pads 126 press resiliently against the channel-shaped members secured on the side edges of the sashes and provide a seal against the passage of air. The pads do not interfere with vertical movement of the sashes in the frame, or with tilting movement of the sashes, because the channel-shaped members on the sash stiles slide easily over the pads.

Desirably these pads 126 are made of material which is highly resistant to wear. One suitable material is nylon fabric having a pile. In order to securely hold the fabric on the frame channel member 21, a strip of the fabric desirably is clamped into a metal backing plate 127, as by folding or rolling the projecting edges of a cruciform piece of sheet metal over the sides and ends of a strip of the fabric laid thereon. The end portions of this backing plate then are folded back to form ears 128. The lower end of the upper frame channel member 21 is provided with slots 129 to receive these ears and the pad may be simply snapped into position on the frame channel member. The face of the-frame channel member 21 lying between the slots 129 may be depressed slightly to receive the backing plate 127 flush with the 15 s M 7 adjacent surface of the member 21 so that there will be no interference with movement of the sashes.

The invention herein disclosed may bevariously moditied and embodied within the scope of the subjoined claims.

We claim:

1. In a window structure comprising a frame having a sill, side jambs and a head, and an upper sash and a lower sash mounted in the frame for sliding movement vertically past each other, in combination, frame channel members secured to the jambs of the frame providing two pairs of opposed sash runways extending the full height of the frame, hollow slides substantially coextensive with the stiles of the upper sash mounted in one pair of sash runways, hollow slides substantially coextensive with the stiles of the lower sash mounted in the other pair of sash runways, the slides and the frame channel members being formed with interengaging longitudinal flange portions which prevent movement ofthe slides transversely out of the runways while permitting vertical movement of the slides in the runways, each of said slides having a longitudinal slot facing toward the inside of the Window providing access to the interior of the slide throughout its length, a runner within each slide, a guide bar secured within each slide along which the runner can move vertically within the slide, aligned pivotal connections between each of the sashes and its two slides adjacent the lower edges of the sashes, four links, each link pivotally connected at one end to one side-edge of a sash at a point spaced above its pivotal connection to the corresponding slide, the other end of the link extending through the longitudinal slot in the slide and being pivotally connected within the slide to the runner therein, means located within each slide for locking the runner in a plurality of adjusted positions along the guide bar therein when the sash is tilted inwardly about its pivotal connection, a latch member located in the upper end of each slide and having a limited range of vertical movement therein, a catch extending laterally from the latch member toward the stile of the associated sash, a hook secured on the side edge of the stile near its upper end for engagement with the catch when the sash is turned to closed vertical position, and spring means within the slide pressing the latch member upwardly to hold the catch in engagement with the hook except when the latch member is depressed.

2. In a window structure comprising a frame having a sill, side iambs and a head, and an upper sash and a lower sash mounted in the frame for sliding movement vertically past each other, in combination, frame channel members secured to the jambs of the frame providing two pairs of opposed sash runways extending the full height of the frame, the frame channel members for each jamb consisting of an upper frame channel member substantially coextensive with the stiles of the upper sash which provides parallel runways for both sashes, and two parallel lower frame channel members each providing a runway for one sash aligned with the runways of the upper frame channel member, the overall dimensions of the two parallel lower frame channel members being similar to the overall dimensions of the upper frame channel member, hollow slides substantially coextensive with the stiles of the upper sash mounted in one pair of sash runways, hollow slides substantially coextensive with the stiles of the lower sash mounted in the other pair of sash runways, the slides and the frame channel members being formed with interengaging longitudinal flange portions which prevent movement of the slides transversely out of the runways while permitting vertical movement of the slides in the runways, each of said slides having a longitudinal slot facing toward the inside of the window providing access to the interior of the slide throughout its length, a runner within each slide, a guide bar secured within each slide along which the runner can move vertically within the slide, aligned pivotal connections between each of the sashes and its two slides adjacent the lower edges of the sashes, four links, each link pivotally connected at one end to one side edge of a sash at a point spaced above its pivotal connection to the corresponding slide, the other end of the link extending through the longitudinal slot in the slide and being pivotally connected within the slide to the runner therein, means located within each slide for locking the runner in a plurality of adjusted positions along the guide bar therein when the sash is tilted inwardly about its pivotal connection, the upper frame channel member including a common enclosure for the upper ends of sash balances for both sashes intermediate the sash runways, two parallel coil springs within said enclosure, means for securing the upper ends of the coil springs against rotation and longitudinal movement within the upper frame channel comprising a flanged member telescoped into the upper end of the frame channel member with the flange portion overlying and resting on the upper end of the frame channel member, the flanged member having two ears within and extending transversely of the frame channel member toward the side of the window frame for connection to the upper ends of the coil springs, the lower frame channel members being G-shaped in transverse section to provide individual longitudinally slotted enclcr sures for the lower ends of the sash balances, and the lower end of each slide being operatively connected to the lower end of the corresponding sash balance by a link extending through the longitudinal slot in the lower frame channel member.

3. In a window structure comprising a frame having a sill, side jambs and a head, and an upper sash and a lower sash mounted in the frame for sliding movement vertically past each other, in combination, frame channel members secured to the jambs of the frame providing two pairs of opposed sash runways extending the full height of the frame, the frame channel members for each jamb consisting of an upper frame channel member substantially coextensive with the stiles of the upper sash which provides parallel runways for both sashes, and two parallel lower frame channel members each providing a runway for one sash aligned with the runways of the upper frame channel member, the overall dimensions of the two parallel lower frame channel members being similar to the overall dimensions of the upper frame channel member, hollow slides substantially coextensive with the stiles of the upper sash mounted in one pair of sash runways, hollow slides substantially coextensive with the stiles of the lower sash mounted in the other pair of sash runways, the slides and the frame channel members being formed with interengaging longitudinal flange portions which prevent movement of the slides transversely out of the runways while permitting vertical movement of the slides in the runways, each of said slides having a longitudinal slot facing toward the inside of the window providing access to the interior of the slide throughout its length, a runner within each slide, a guide bar secured within each slide along which the runner can move vertically within the slide, aligned pivotal connections between each of the sashes and its two slides adjacent the lower edges of the sashes, four links, each link pivotally connected at one end to one side edge of a sash at a point spaced above its pivotal connection to the corresponding slide, the other end of the link extending through the longitudinal slot in the slide and being pivotally connected within the slide to the runner therein, means located within each slide for locking the runner in a plurality of adjusted positions along the guide bar therein when the sash is tilted inwardly about its pivotal connection, the upper frame channel member including a common enclosure for theupper ends of sash balances for both sashes intermediate the sash runways, two parallel coil springs within said enclosure secured at their upper ends against rotation .and longitudinal movement, the lower frame channel members being G-shaped in transverse section to provide individual longitudinally slotted enclosures for the lower ends of the sash balances, the lower end of each slide being operatively connected to the lower end of the corresponding sash balance by a link extending through the longitudinal slot in the lower frame channel member, this link being secured at one end to the lower end of I end e tending through the longitudinal slot in the G- shaped lower frame channel member substantially across the interior thereof into engagement with a loop on the lower end of the sash balance.

4. In a window structure comprising a frame having side jambs and a head,and an members secured to the jambs of the frame providing two pairs of opposed sash runways extending the full height of the frame, hollow slides substantially coextensive with the stiles of the upper sash mounted in one pair of sash runways, hollow slides substantially coextensive movement of the slides in the runways, each of said slides having a longitudinal slot facing toward the inside of the window providing access to the interior of the slide througout its length, a runner within each slide, a guide bar secured within each slide along which the runner can move vertically within the slide, aligned pivotal connections between each of the sashes and its two slides adjacent the lower edges of the sashes, four links, each link pivotally connected at one end to one side edge of a sash at a its pivotal connection to the other end of the link extending through the longitudinal slot in the slide and being pivotally connected within the slide to the runner therein, means located within each slide for locking the runner in a plurality of adjusted positions along the guide bar therein when the sash is tilted inwardly about its pivotal connection, characterized by the fact that the longitudinal slots in the slides have lips extending toward the inside of the window parallel to the side edges of the sash stiles, and by the fact that the edges of the sash stiles are covered with channel-shaped members which are substantially of the lip along the longitudinal slot in the slide is bent laterally toward the sash stile to provide a wedging action where the lip of the slide is engaged between the lip of the channel-shaped member and its web.

5. In a window structure comprising a frame having a sill, side jambs and a head, and an upper sash and a lower sash mounted in the frame for sliding movement vertically past each other, in combination, frame channel members secured to the jambs of the frame providing two pairs of opposed sash runways extending the full height of the frame, hollow slides substantially coextensive with the stiles of the upper sash mounted in one pair of sash runways, hollow slides substantially coextensive with the stiles of the lower sash mounted in the other pair of sash runways, the slides and the frame channel members being formed with interengaging longitudinal flange portions which prevent movement of the slides transversely out of the runways while permitting vertical movement of the slides in the runways, each of said slides having a longitudinal slot facing toward the inside of the window providing access to the interior of the slide throughout its length, a runner within each slide, a guide bar secured within each slide along which the runner can move vertically within the slide, aligned pivotal connections between corresponding slide, the other end of the link extending through the longitudinal slot in the slide and being pivotally connected which engages the notches in the bar rack successively as the sash is tilted inwardly, locking the sash against further tilting movement as each notch is engaged, until the pivot pin is released from the notch.

6. A window structure according to claim 5, including it to pass over the notch upon further tilting of the sash inwardly.

7. A window structure according to claim 6, including means actuated automatically as th pivot pin passes beyond the notch to release the holding means, so that the pivot pin will engage the next notch on the rack as the sash is tilted further inwardly.

8. A window structure according to claim 7, in which the means for holding the pivot pin out of engagement with the notch in floating mountlng on the runner and an ear on said plate which rides along the notched edge of the rack.

9. A window structure according to claim 8, in which of the runner, and in which the pivot pin engages the slots floating plate.

References Cited in the file of this patent