US 907151 A
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Description (OCR text may contain errors)
R. KJBLLLN & E. ANDERSON.
APPLIOATION FILED AUG. 24, 190e.
Patented Dec. 22, 1908;
UNITED STATES PATENT OFFIOE.
Specification of Letters Patent.
Patented Dec. 22, 190s.
Application filed August 24:, 1908. Serial No. 449,902.
To all whom it may concern:
Be it known that we, RUDOLPH KJELLIN and ERIC ANDERSON, citizens of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Sash-Oenters, of which the following is a speciiication.
This invention relates to a sashecenter or pivot-fixture for swinging transoms and other sashes, the same belonging to devices of this class which retain the sash in a more or less open position.
The object of our invention is the provision of a reliable sash-center and holder oi this character which is comparatively simple and inexpensive in construction.
In the accompanying drawings: Figure 1 is a sectional `face view of a window frame and sash provided with the improved center. Figs. 2 and 3 are perspective views, respectively, of the pivot-plates.
Similar letters ci' reference indicate corresponding parts in the several figures.
The invention is equally applicable to vertically and horizontally-swinging sash, the same being shown in connection with a vertically-swinging sash in the drawings, in which A indicates the sash and B the stationary window Jframe.
C and D represent a pair of plates secured respectively to the edge oi the sash and the opposing edge of the window frame and countersunk therein, as shown.
E is a pivot or bolt passing centrally through these plates and connecting them. One of the plates, say D, is preferably provided on its face concentrically with the plivot bolt with a circular boss f which is tted in a corresponding recess g in the face of the opposing plate C. This boss and recess increase the pivotal bearing surface of' the plates on each other and largely relieve the connecting bolt E from strain. If desired, a hub h may be formed on the recessed plate C around the pivot-bolt, which hub is htted in a cylindrical cavity i arranged centrally in the boss f. This hub and cavity are however not indispensable, and may be omitted if desired.
Formed in the bottom of the recess concentrically with the hub 72, is a circular row of detent-depressions j with which interlock one or more detent balls 7c or equivalent members carried by the plate D. These balls are guided in sockets l formed in the face of the boss f opposite the row of depressions y', and are backed by spiral or other suitable springs m seated in said sockets and tending to constantly press the balls into said depressions. The latter are preferably concave to fit the projecting portions of the detent balls, as shown. In the drawings four equidistant balls are shown, but a greater or less number may be employed, if desired.
By this construction, the detent-balls interlock with the corresponding set of depressions in all positions of the sash and reliably hold it at any angle to which it may be turned lor o ening it more or less. At the same time, tlie engagement of the balls with the depressions, though sufficiently reliable to hold the sash in place, is frictional rather than positive and therefore permits the sash to be easily swung from one position to another.
We claim as our invention:-
l. A sash-center comprising a pair of plates adapted to be secured respectively to the sash and the trame, a pivot connecting said plates, one of the plates having in its inner face a row of detent-depressions arranged concentrically with said pivot and the other plate having in its opposing inner face one or more sockets, and spring-pressed detent-members seated in said sockets and adapted to interlock with said depressions.
2. A sash-center comprising a pair of plates adapted to be secured respectively to the sash and the frame, a pivot passing through said plates, one of the plates being provided in its face with a circular row of depressions arranged concentrically with the pivot and the other plate being provided in its face with a socket, and a spring-pressed ball arranged in said socket and adapted to interlock with said depressions.
3. A sash-center comprising a pair of plates adapted to be secured respectively to the sash and the frame, a pivot passing through said plates, one of the plates having in its face a circular recess provided in its bottom with an annular row of depressions, and the other plate having a circular boss seated in said recess and provided in its face with sockets arranged opposite said depressions, and spring-pressed detent-members arranged in said sockets and coperating with said depressions.
4. A sashecenter comprising a pair of plates adapted 'to be secured respectively to the sash and the frame, a pivot passing bers seated in Vsaid socket and interlocking through said plates, one of the plates having With said depressions. in its face a circular recess provided centrally Witness our hands this 21st day of August,
with a hub through which the pivot passes 1908. 5 and around said hub with an annular roW of 'l depressions, and the other plate having a circular boss fitted in said. recess and provided centrally with a cylindrical cavity which re- Witnesses:
ceives said hub and around said cavity with C. F. GEYER,
10 sockets, and spring-pressed detent-niem- E. M. GRAHAM.