US1023731A - Sash-balancing mechanism. - Google Patents

Description

E. GEORGEPF.

SASH BALANGING MECHANISM.

APPLIOATIDN FILED JULY 2a. 1911` Patented Apr. 16, 1912.

W/TNESSES:

UNITED sTATEs PATENT oEEIoE.

EVAN GEORGEFF, OF PORTLAND, OREGON.

SASH-IBALANCING MECHANISM.

T0 all whom it may concern Be it known that I, EVAN GEORGEFF, a subject of the King of Bulgaria, residing at Portland, in the county of Multnomah and State of Oregon, have invented certain new and useful Improvements in Sash-Balancing Mechanism, of which the following is a specification.

My invention relates to means for balancing and locking window sashes, and is an improvement on a device of this character for which Letters Patent were ranted to me, of the United States, on ept. 13th, 1910, NO. 970,036.

The object of my invention is to provide a device of the type mentioned of simple and durable construction, by means of which any sliding sash window can be opened or closed at will from the inside, and then locked in osition, so that a erson from the outside is unable to disturb t e adjustment of the window sashes.

To this end my invention consists in the combinations and arrangements clearly set forth in the followin description.

In the appended rawing forming part of this application Figure 1 is a sectional elevation of a sash balancing device embodying my invention, Fig. 2 is a sectional rear end elevation in agreement with Fig. 1, Fig. 3 illustrates in sectional side elevation the actuating mechanism of my device, Fig. 4 is a front view of the mechanism shown in Fig. 3, and Fig. 5 shows a modified form of sash lockingr mechanism.

To the window frame a is secured a casing b, in which is rotatably hung a spindle d, and to said spindle is rigidly secured a gear wheel c. Said gear wheel is constantly in mesh with a rackbar e, secured to the edge of window sash f. A suitable spring g, suspended between spindle d and casing serves to counterbalance the weight of sash f.

I wish it understood that I prefer to provide sets of balancing devices on both sides of the window in order to perfectly balance both the upper and lower sashes controlled by said devices, but as the construction of my device in all cases remains the same, I confine myself to the description of one device in connection with the lower sash A rock-shaft h is journaled in casing b in vertical alinement with spindle al, and to this shaft is rigidly secured a pawl z'. The latter Specification of Letters Patent.

Application led July 28, 1811.

Patented Apr. 16, 1912.

Serial No. 641,153.

is made with two symmetrical arms disposed on opposite sides of the rock-shaft and adapted to engage the teeth of gear-Wheel c. Integral with pawl z' is a centrally disposed detent l, which through the medium of a spring mechanism m controls the action of said pawl.

To fully understand the operation of my device sash f is, in the first instance, considered to be in its highest position. On lowering the sash gearwheel c is caused to rotate in the direction of arrow n, thus winding spring g. When the sash has been lowered as far as desired, pawl z' is caused to oscillate until arm lc engages gear-wheel c as shown in dotted outline 1n Fig. 1, thereby locking the sash against upward motion. It is thus possible to leave the sash partly open, without danger of an intruder raising the sash from the outside, as the mechanism controlling the movement of rock-shaft 7L, as will be described later, is mounted on the inside of the window frame. If on the other hand the operator desires to raise the sash and to lock it against downward motion, pawl z' is oscillated in the oposite direction causin arm to enffaee l b D gear-Wheel c.

Rock-shaft h is of a tubular construction and provided with a longitudinal slot o. A key p, mounted on the inside facing strip g of window frame a, is adapted to engage rock-shaft h, and in thus engaging rib r of said key lodges in slot o of said shaft. Key p is rotatab y fixed in escutcheon plate s, and is provided with a circular handle or knob t, to the base of which is secured a ointer u in alinement with rib r of the key. l aid escutcheon plate is provided with a scale, see Fig. 4, with which pointer u is adapted to register. If for instance it is desired to raise the closed sash a few inches for ventilation, pointer u is first brought to register with the central graduation marked Free;J whereby pawl i is thrown clear of gear c. The sash is then raised and pointer u, in order to lock the sash against further raising motion, is turned until it registers with the graduation marked Down.

Attention is called to the peculiar shape of spring m, by means of which the operator is able to lock pawl z' in any one of its three positions. When in its central position, the pavvl, as already shown, is cntirely clear of the geanwheel, and the sash may be raised or lowered unobstructed, which is a great convenience for instance in cleaning the window.

If handle t were oblong as it is usually found in devices of this type, it would be possible for an outside intruder, if the sash were held raised a few inches, to sli a stick through the opening and turn sai handle sutliciently to further raise the sash, but with the circular knob t shown this is not possible. On the other hand the pointer u and the graduations on the escutcheon plate are necessary in connection with the circular knob in order to enable the operator to quickly and accurately manipulate the mechanism.

In Figs. 4 and 5 I illustrate an additional and important feature of my invention. Pawl z' is here replaced by a compound pawl fv, comprising arm w integral with which is detent m. Arm y on the other hand is rotatably hung on shaft h and held in its normal position by the action of a light spring 3, which forces shoulder 2 of the arm against projection e of the detent. A dog 4 is mounted to rotate with a stud 5, and the stud extends inward through the window frame and escutcheon plate s, its inner end being provided with a knob 6. The operator raises the sash and oscillates arm w, thereby causing said arm w to engage gear c and the sash is locked against further raising, but it is still free to be lowered. To lock the sash so that it cannot be lowered either, dog 4 is, by turning knob 6, caused to engage and depress arm y, which readily yields against the light pressure of spring 3, and engages gear-wheel c.

Having thus described my invention, I claim:

l. In a device of the character described in combination with spring controlled balancing means, a gear wheel, a hand operated pawl mechanism coperating with said gearwheel, a detent on said pawl mechanism, a tri-grooved spring coperating with said detent to retain said pawl mechanism in any position required to operate the sash.

2. In a device of the character described in combination with spring controllel balancing means, a gear wheel, a hand operated pawl mechanism cooperating with said gearwheel, a detent on said pawl mechanism, a tri-grooved spring cooperating with said detent to retain said pawl mechanism in any position required to operate the sash, and a hand operated dog for effecting the interlocking of said pawl mechanism with said gear Wheel.

3. In a device of the character described in combination, a casing, a gear wheel rotatably hung in said casing and engaging a rack bar on the sliding sash, a sash balancing spring between said gear and said casing, a rock shaft journaled in said casing, a lock pawl rigid on said rock shaft, a lock pawl journaled on said rock shaft, cooperating spring actuated means for holding said pawls interlocked, means for oscillating said rock shaft to cause either of said pawls to engage the gear wheel, or to totally disengage said pawl mechanism from said gear wheel, means for yieldingly retaining said lock pawl in any one of its three positions, a circular handle attached to said rock shaft, a pointer, a scale on the Window frame coperating with said pointer to indicate the setting of the pawl mechanism, and a hand operated dog for eiiecting the interlocking of said pawl mechanism with said gear wheel.

In testimony whereof I alix my signature in presence of two witnesses.

EVAN GEORGEFF.

Witnesses:

K. F. DOUGHTY, C. C. ABBo'rr.

Copies o! this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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