US1700093A - Window latch - Google Patents

Description

Jan. 22, 1929.

' 1,500,093 W. S. HAMM WINDOW LATCH FilBd March 19, '1926 Patented Jan. 22, 1929.

UNITED STATES PATENT OFFICE.

WILLIAM S. HAMM, OF HUBBARD WOODS, ILLINOIS, ASSIGNOR TO THE ADLAKE COM- PANY, A CORPORATION OF ILLINOIS.

WINDOW LATCH.

'Application filed March 19, 1926.

The invention relates to latches designed especially for use in connection with window sash having comparatively narrow stiles and rails, such as those which are made of metal and are in common use in railway cars.

Sashes having the characteristic named do not provide ample frame surface for carrying the casings of latches, as heretofore made, Without having the casing project over the glazing.

The objects of the present invention are to provide a latch housed in a casing capable of being applied to a narrow sash frame sun face without overhanging the same; and to I simplify and generally improve the latch mechanism.

- These objects are attained in the construction hereinafter described and illustrated in the accompanying drawings, in which i Fig. 1 is a detail elevation of a sash and window casing (the latter. being shown partly in section) with the improved latch applied thereto;

Fig. 2 is a plan section on the line 22 of Fig. 1;

Fig. 3 is an elevation of the inner face of the latch in assembled form; I

Fig. 4 is a view in perspective of the latch casing;

Fig. 5 is a detail of the latching dog;

Fig. 6 is a detail of the dog-controlling lever; and

Fig. 7 is a detail section on the line 77 of Fig. 4.

There is represented at 10 one of the stiles of a window sash, and at 11 the bottom rail thereof. At 12 there is shown one of the stiles of the window casing, which is equipped with the usual stop bar 13, having pockets or recesses 14L for engagement by the latching dog in order to support the sash at the desired elevation.

The latch casing is generally represented by the numeral 15, and is L-shaped to be fitted to the corner of the sash, one of its sections being fitted to the stile 10, and the other sec tion being fitted to the bottom rail 11, the casing being secured to the sash as by the screws 16, 17. The chamber of the casing extends into both of its sections.

The latching-dog 18 is housed within the upright-or stile-engaging section 19, and is in the form of an oscillating arm having a lateral projection or nose adapted to project through an aperture 20 in the casing, and to Serial No. 95,892.

cooperate with the several stops 14. The dog is pivoted within the casing in any suitable manner, but one of the features of the inven tion consists in the improved means for securing the pivotal action. The heel 21 of the dog is rounded, having the form of an arc of a circle, and fits within and against a complementary surface 22 formed in the upper-end of the casing, which'is recessed, as shown in Fig. 7, to better retain the dog in place.

The operating lever 23 is in the form of a bell-crank, one arm of which is housed within the horizontal member 24 of the casing 15 and carries a thumb-piece 25, which projects through a suitable aperture 26 in the casing wall and is preferably upwardly directed. The other arm 27 of the bell-crank projects upwardly into the upright casing section 19. At the angle of the bell-crank its outer margin is rounded, as shown at 28, to the arc of a circle and fits within a complementary-recess 29 formed in the outer wall of the casing at its angle. The bell-crank will, therefore, oscillate upon this curved bearing with a pivotal movement without requiring the use of a pivot pin.

At the inner end of the bell-crank there is a laterally projecting lug 30, which projects through an aperture 31 in the dog 18, whereby the oscillation of the dog is efiected by the oscillation of the bell-crank.

Spring means is provided for advancing the dog and elevating the thumb-piece. Such means may be applied either to the dog or the bell-crank, or to' both. The last-named arrangement is preferred, for while either spring will hold both parts in the desired normal position they together serve the purpose of holding the elements in assembled relation before the application of the casing to the sash.

The spring associated with the dog is in the form of a bent wire 32, one of its ends, 33, being bent to engage in an aperture 34 in the lug 30, its opposite end bearing against the side wall of the casing and preferably being provided with a slight offset, as shown at 35, for engaging a recess or aperture 36 therein, the spring being continuedand bent to project over the free end of the dog, as shown at 37. The spring 38 associated with the bell-crank is also in the form ofa bent Wire, one of its ends, 39, being positively engaged with the free end of the bell-crank by passing through an aperture 40 therein, and the other bearing against a side wall of the casing and preferably being provided with an offset, as 41, for engaging an aperture or,

recess 42 therein. The spring 38 is better retained in operative position by providing a stud or hook 43 at the angle of the bellcrank, and which projects through the loop recess A2. The dog is now inserted in proper position, the end 33 of the spring 32 is hooked. into the aperture in the lug 30, and the offset 35 is brought into engagement With the recess 36, thereby forcing the free end 3'7 of the spring against the face of the dog.

Thus assembled the latch may be packed for shipment and the parts are securely held in assembled relation pending the application to the sash. In operation the dog is nornotches.

mally advanced and the thumb-piece raised by the spring action, and the dog is withdrawn by the depression of the thumb-piece. Should either of the springs be broken or weakened, the other will continue to function and hold both of the movable latch elements in normal position.

While a preferred form of construction is disclosed, the invention is of wider scope than the details shown.

While in its broader aspects the invention may be embodied in a structure in which the pivotal mounting of the dog and controlling lever is of different form from that shown, the form illustrated has decided advantages in that by dispensing with pivot pins the cost of manufacture, simplicty of assembling and great strength and durability are secured.

The extended pivotal bearing of the dog against the upper end of the casing is of decided advantage. A window sash is not in,-

frequently allowed to drop, unretarded, and in that event the dog usually arrests the descent by catching in one of the lower casing This, puts the latch under great strain, and a mere pivot pin is likely to be bent or displaced. In the construction shown such shocks are sustained by the entire end of the casing which, being of small size, pos sesses ample strength, even though. the casing be formed of sheet metal.

I claim as my invention- 1. A sash latch having an L-shaped casing adapted for attachment to a sash at an angle thereof and to conform to such angle, and latch mechanism housed within both arms of said casing.

2. A sash latch having an Lshaped casing, an oscillating latching dog housed in one leg of the casing and having a rocking hearing on a rounded surface of the casing, and a dog-controlling element projecting from the other leg of the casing.

3. A sash latch having an L-shaped casing,

a latching dog housed in one leg of the casing, a bell-crank for controlling the dog and projecting from the other leg of the casing, the bell-crank being fulcrumed at its angle on a rounded face of the casing.

- 4-. A sash latch having an L-shaped casing adapted for attachment to the corner of a sash and conforming thereto, a latching dog projecting from one leg of the casing, a dogcontrolling element projecting from the other leg thereof, and spring means for advancing the dog and for holding the dog and con trolling element in assembled relation within the casing.

5. A sash latch comprising an L-shaped casing adapted for attachment to the corner of a sash and conforming thereto, a latching dog housed in and projecting laterally from one leg of the casing, and a dog-controlling lever housed inthe other leg and projecting into the leg housing the dog.

6. A sash latch comprising a casing having a portion of its wall formed into a rounded bearing surface, and a latching dog carried by the casing and having a rounded surface pivotally engaging the named bearing surface.

7. A sash lock comprising a casing having a portion of its wall formed into a rounded bearing surface, a latching dog, and a dog-controlling'lever, such lever having a rounded surface pivotally engaging the named bearing surface.

8. A sash latch comprising a casing having a recess the bottom of which is rounded, and a latching dog fitting within the recess and having pivotal engagement with its rounded bottom.

9. A sash latch comprising a casing having a downwardly facing rounded bearing surface, and a latching dog having its upper end rounded and seated against and turning upon the rounded bearing surface.

10. A sash latch having an L-shaped casing adapted for attachment to a sash. at a corner thereof, and conforming thereto, a latching dog housed within the casing and projecting from the outer face of the stile attached leg thereof, and a dog controlling element projecting from the inner face of the rail attached leg of the casing.

11. A sash latch comprising an L-shapcd casing having rounded bearing surfaces at the end of one leg and at the juncture of the two legs, a latching dog having a rounded end piv-otally seated on the first named bearing surface, and a bell crank shaped latching dog controlling element having a rounded face at its angle and pivotally engaging the second named bearing surface.

12. A sash latch comprising, in combination, an L-shaped casing having rounded bearing surfaces at the end of one leg and at the juncture of the two legs, and a cooperating latching dog and controlling lever each having a rounded bearing face engaging one of the named bearing surfaces of the casing.

13. A sash latch. comprising an L-shaped casing having rounded bearing surfaces at the end of one leg and at the juncture of the two legs, a latching dog having a rounded end pivotally seated on the first-named bearing surface, and a bell-crank shaped element for supporting and controlling the dog and having a rounded face at its angle and pivotally engaging the second-named bearing surface.

14. A sash latch comprising, in combination, an L-shaped casing having rounded bearing surfaces at the end of one leg and at the juncture of the two legs, a latching dog having a rounded bearing face engaging the first-named bearing surface, a controlling lever having a rounded bearing face engaging the second-named bearing surface and being interlocked With the dog to hold it in engagement with the bearing surface of the casing and rocking it thereon.

15. An L-shaped sash latch casing, a latching dog and an actuating lever interlocking therewith, an advancing spring bearing on the dog, and a retracting spring bearing on the lever.

16. In a sash latch,in combination, an L shaped casing adapted When attached to have one arm applied to a sash stile and the other arm applied to a cross-bar of the sash, a spring-advanced latching dog pivoted within the stile-engaging arm of the casing, a spring retracted bell-crank shaped controlling lever pivoted in the stile-engaging arm and projecting into the cross-bar engaging arm of the casing, the dog and lever being positively and directly interlocked.

17. An L-shaped latch casing both arms of Which are chambered, a latching dog and a controlling lever therefor, both of such elements being housed Within the casing, the dog projecting through an opening in one arm thereof, and the lever projecting through an opening in the other arm thereof.

In testimony whereof I aflix my signature.

WILLIAM S. HAMM.

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