US2298952A

US2298952A - Venetian blind cord lock

Info

Publication number: US2298952A
Application number: US448589A
Authority: US
Inventors: Hans K Lorentzen
Original assignee: LORENTZEN HARDWARE Manufacturing CORP
Current assignee: LORENTZEN HARDWARE Manufacturing CORP; LORENTZEN HARDWARE MF'G CORP
Priority date: 1940-08-17
Filing date: 1942-06-26
Publication date: 1942-10-13
Anticipated expiration: 1959-10-13

Description

Oct. 13, 1942. H. K. LORENTZEN VENETIAN BLIND CORD LQCK Original Fil ed-Aug. 17, 1940 'IIIIIIIIIIIIIIIII 2 INVENTOR HANS K. LORE/VTZEN I ATTORNEYS Patented Oct. 13, 1942 VENETIAN BLIND com) LOCK Hans K. Lorentzen, Montclair, N. J., assignor to Lorentzen Hardware M! Corp, New York, N. Y., a corporation of New York Original application August 17, 1940, Serial No. 353,020. Divided and this application June 26,

1942, Serial No. 448,589

6 Claims.

This invention relates to Venetian blind cord locks used for locking the elevator or lift cords of Venetian blinds. Originally the subject-matter was presented in my application Serial No. 353,020, filed August 17, 1940, of which this is a division.

General objects of the invention are to provide a Venetian blind cord lock of increased simplicity, to lower the manufacturing cost of such cord locks, to eliminate certain manufacturing operations in connection with such cord locks, and to improve the operating characteristics of the cord locks.

Various other and specific objects of the invention will be apparent to those skilled in the art from the following disclosure.

Fig. l of the drawing is a fragmentary front elevation showing the present invention in conjunction with a Venetian blind.

Fig. 2 is a vertical section taken approximately on the line 22 of Fig. l, certain parts being omitted.

Fig. 3 is a fragmentary sectional view taken in general on the line 33 of Fig. 2.

Fig. 4 is a perspective view of the locking dog.

The cord lock is included in a combination cord lock and tilt bar bracket I0. is attached to the head-bar 1 in a well-known manner, and has a depending leg I6 which rotatably supports the gudgeon pin l that projects from the end of the tilt bar l2. Suspended from the tilt bar in a conventional manner are the conventional articulated slats l1 of the blind; and conventionally arranged lift cords l8 and I9 are provided for raising and lowering the blind.

The cord lock includes a stamped U-shaped sheet-metal casing 45 of a general form which is already known. The mouth of the U-formation is provided with integral projections which pass through openings in brackets l6 and are riveted thereto, e. g. at 3 in Fig. 3. Each side of the U-formation is provided with a wedgeshaped cut-out or notch such as shown at 46 in Fig. 3. A locking dog 41 is provided with a toothed edge 4 and is arranged to rock in the casing 45 to thereby lock and release the cords l8 and I9. Projecting laterally from both sides of locking dog 41 are

fiat extensions

48, 48 best seen in Figlilt In assembly, these

extensions

48, 48 are inserted in notches 46 and then the U- shaped casing is assembled with and secured to the bracket l6. Thus the bracket l6 acts as a bridge member to close the notches 46 and keep the dog 41 in assembled position.

This bracket It will be noted that the

flat extensions

48, 46 fit loosely into the notches 46 so as to permit rocking movement of the dog 41. With the cord swung against the teeth at 4 on the lower edge of the dog, slight upward movement of the cord rocks the dog upwardly and causes the cord to be wedged against the bump 5 in the casing 45 and to lock the cord in a manner well understood in the art. With the dog 41 in locking position, a slight downward pull on the cords I8 and I9 causes the dog to be released and to drop into the position shown in Fig.3. The dog 41 'may be a simple sheet metal stamping made in one operation and having integral therewith the teeth at 4 and the

fiat extensions

48, 48. The size and dimensions of wedge-

shaped notches

46, 46 are so proportioned with respect to the fiat extensions 48 that the notches cooperate with the extensions to arrest the dog at the desired stage of its downward or released movement. This arrested position is shown in Fig. 3.

The present invention is in some respects an improvement upon the cord lock shown in Lorentzen Patent 2,075,214 of March 30, 1937, and reference may be had to that patent for a more complete disclosure of certain structural features ancillary to the present invention.

In compliance with the patent statutes, I have disclosed the best form in which I have contemplated applying my invention, but it will be understood that the disclosure is illustrative of the invention rather than limiting the scope of the same.

What I claim is: V

1. In a Venetian blind fitting of the type in which a U-shaped cord lock casing has a 1ocking dog rockably mounted therein and has the mouth of the U-formation secured to a tilt bar bracket, the improvement which comprises: the locking dog being provided with integral extensions on which it rocks, the opposite sides of the U-formation being provided with notchesinto which the extensions are inserted, and said bracket acting to close the ends of said notches and thereby hold the dog in' assembled position in the U-shaped casing.

2. In a Venetian blind fitting of the type in which a U-shaped cord lock casing has a locking dog rockably mounted therein and has the mouth of the U-formation secured to a tilt bar bracket, the improvement which comprises: the locking dog being provided with integral flat extensions on which it rocks, the opposite sides of the U-formation being provided with notches of wedgeshaped form into which the extensions are inserted, and said bracket acting to close the ends of said notches and thereby hold the dog in as- 7 sembled position in the U-shaped casing.

3. In a- Venetian blind fitting of the type in which a hollow cord lock casing has a locking dog rockably mounted therein to move in cordengaging and cord-release directions the improvement which comprises; the locking dog be ing provided with extensions on which it rocks;v

and the casing being provided with cut-outs '5. In a Venetian blind fitting of the type m which a U-shaped cord lock casing has a locking dog rookably mounted therein and has the mouth i of the U-formation traversed by a bridge member,

the improvement which comprises:- the locking dog being provided with extensions on which it rocks, the opposite sides of the U-formation be ing provided with notches into which the extensions are inserted, and said bridge member act which loosely receive the extensions and act conjunction therewith to limit the movement of Y the dog in cord-release direction.

4. In a Venetian blind fitting of the type in which a hollow cord lock casing has a locking dog rockably mounted therein to move in cord-en gaging and cord-release directions, the improvement which comprises: the locking dog being pro-- vided with flat integral extensions on which it rocks, and the casing being provided with wedgeshaped cut-outs which loosely receive the exten-v sions and act in conjunction with the edges of the extensions to limit the movement of the dog in cord-release direction.

ing to close the ends of said notches and thereby -hold the dog in assembled position in the U- shaped casing.

6. In a Venetian blind fitting of the type in Y which a U-shaped cord lock casing has a. locking HANS K. LORENTZEN.