US1372000A - Door-latch - Google Patents

Description

C. E. ANDERSON.

DOOR LATCH.

APPLlCATION HLED JULY 23,1919.

mum m 22,1921

UNITED STATES CARI; E. ANDERSON, OF WORGESTER, MASSACHUSETTS.

DOOR-LATCH.

Specification of Letters Patent.

Patented Mar. 22, 1921.

Application filed July 23, 1919. Serial No. 312,735.

To all whom it may concern:

Be it known that I, CARL E. ANDERSON, a subject of the King of Sweden, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Door-Latch, of which the following is a specification.

This invention relates to a door latch of the general type shown in my prior application, Serial No. 280,298, filed March 3, 1919.

It is the object of my present invention to improve the construction of the door latch therein shown in certain respects, and particularl to rovide improved devices for manua y re easing the bolt, by which a wider range of motion of the handle is permitted.

In the preferred form of my invention, a direct gear connection is provided between the releasing handle and the slidable looking member to be described.

A further object of my present invention is to provide a spring directl connected between the ivoted bolt and t e said locking member, e ective to move the bolt to inoperative position and the locking member to operative position.

Further features of my invention relate to arrangements and combinations of arts hereinafter described and more particu arly' pointed out in the appended claims.

A preferred form of my invention is shown in the drawings in which- Figure 1 is a plan view of my improved door latch;

Fig. 2 is a side elevation of the door latch, with portions of the casing broken away;

Fig. 3 is a sectional end elevation taken along the line 33 in Fig. 1;

Fi 4 is a view similar to Fig. 3, but showing the parts in a diiferent position, and

Fig. 5 is a detail sectional view of the looking member, taken along the line 55 in fieferring to the drawings, my improved door latch comprises a striker 10, commonly secured to a fixed door frame 11, and a casing 12, commonly mounted upon the door 13. A bolt 14 is pivoted at 15 in the casing 12, the bolt being provided with a downwardly projecting arm 16 disposed in the path of the striker 10. A second arm 17 of the bolt 14 is positioned behind the striker '10 asthe door is closed, and is securely held in this position by the engagement of a locking member 18 with a third arm 19 of the bolt 14:.

The locking member is preferably formed as a box-like structure sliding freely Withm the casing 12 and is provided with an inclined or wedge-like portion 20 which engages the arm 19. A coil spring 21 is connected at its upper end to the locking member 18 and at its lower end to the arm 17 of the bolt 14. The spring is effective to move the locking member to operative position and the bolt to inoperative position.

When the locking member is raised, as shown in Fig. 3, the bolt will be swung upon its pivot to a osition in which the arm 19 thereof stan s beneath the end of the wedge-like portion 20 of the lockin member. This arrangement of parts ho ds the locking member in raised position, and also yieldingly retains the bolt in inoperative position. v

For the purpose of raisin the locking member 18 to release the bolt,% rovide said member with a series of mo teeth 22, formed on one edge thereof and projecting through a slot in the casing. These teeth are engaged by a segment gear 23 mounted upon a shaft 24 to which one or more handles 25 may be secured.

I have thus provided a direct gear connection between the handle shaft and the locking member 18, by which said member may be raised to release the bolt. By this connection, a considerable range of movement of the handles 25 is permitted, a feature which is found desirable under certain conditions of use.

. It will further appear that the door latch herein described is of exceedingly simple construction with very few parts and with little possibility of accident or failure of operation.

Having thus described my invention, it

will be evident that changes and modificarality of teeth formed directly thereon, a

segment gear meshing with said teeth, and manual means to actuate said gear to move said locking member to inoperative position.

2. A door latch having, in combination, a striker, a casing, a bolt ivoted therein, a locking member for said bolt movably mounted in said casing, a handle a positive gear connection between said handle and said member, and a yielding connection between said member and said bolt efiective to move said member to operative position, and said bolt to inoperative position.

3. A door latch having, in combination, a

striker, a casing, a bolt pivoted therein, a

locking member for said bolt slidable in said casing said member having rack teeth thereon, a segment gear meshing with said rack teeth, and manual means to actuate said segaeraooo ment gear to move said locking member to inoperative position.

i. A door latch having, in combination, a striker, a casing, a bolt pivoted therein, a recessed locking member forsaid bolt of hollow, substantially rectangular oonstruction fitting within said casing and 'slidable therein, manual means to withdraw said member from looking position, and a spring disposed within the recess of said member and connected at one end to said member and at the other end to said bolt, said spring being efi'ective to move said member to operative position and said bolt to inoperative position.

in testimony whereof I haveaflixed my signature.

cast a. annnnson.

hereunto

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