US2247556A - Door bolt - Google Patents

Description

July 1, 1941. P, LAZARIDES 2,247,556

DOOR BOLT Filed Aug. 9;, 1938 10 INVENTOR. g1 Pinion Lazarzdes ll 1 BY 71 g7 ORNEY.

Patented July 1, 1941 UNITED STATS ATE;

. .FFHCE 3 Claims.

This invention relates to bolts for securing doors, windows, blinds, and the like, and the object is to provide a structure capable of being stamped entirely from sheet metal with the least number of parts at low cost and requiring no machining or assembly operations, and capable of manufacture in any size and weight serviceable for light and heavy duty.

In carrying my invention into eifect I have devised a closure fastener having three parts, i. e., a bolt casing, a bolt and keeper all stamped from sheet metal. The casing is stamped from a single piece to form a semi-cylindrical body with laterally projecting fastening flanges, bearing lugs for retaining the bolt within the casing and for preventing the bolt from coming into contact with the surface to which the casing is secured, and a spring blade having three functions, i. e., for frictionally engaging the bolt; for preventing withdrawal of the bolt from the casing, and for holding the bolt in the unlocked position. The bolt is also stamped from a single piece into semi-cylindrical form to fit and slide within the casing body, and with an arched leading edge or nose to facilitate entrance into the keeper, a tail piece to form an operating knob, and an indentation to be engaged by the spring blade of the casing to prevent withdrawal of the bolt and to hold the bolt in the unlocked position. The keeper is also stamped from a single piece with a semi-cylindrical part for engaging the bolt, laterally projecting fastening flanges, and lugs for engaging the bolt to prevent loose fit or play of the bolt within the keeper and to prevent rubbing contact of the bolt on the surface to which the keeper is secured.

My invention is illustrated in the accompanying drawing as applied to a small bolt for light duty, and in which- Figure 1 is a plan view of the bolt, casing and keeper in the locked position.

Figure 2 an end View of the keeper and bolt as viewed from the right hand end of Figure 1.

Figure 3 an end view of the casing and bolt as viewed from the left hand end of Figure 1.

Figure 4 a bottom plan view of the bolt, casing and keeper.

Figure 5 a longitudinal vertical section on the line 55 of Figure 1 with the bolt in the retracted position.

Figure 6 a plan view of the bolt blank before shaping.

Figures '7 and '7 are respectively plan and edge views of the casing blank before shaping, and

Figure 8 a plan view of the keeper blank before shaping.

Referring to the drawing, and more particularly to Figure 1, in which the three parts of the device are shown assembled in the locking position, I indicates the bolt, 2 the bolt casing, and 3 the keeper.

The bolt is blanked out from sheet metal of the desired gauge in the form of a flat strip I having a curved end l tail piece I, and rectan-gular cuts I as illustrated in Figure 6. This blank is formed into a semi-cylindrical body as seen in Figure 5 to form the bolt 1 having an arched leading end or nose 4, and the tail piece is bent to form the operating handle or knob 5 of any desired shape, but preferably is bent into circular form as shown in Figure 5, and for large heavy duty bolts the ring 5 will be closed into contact with the back of the bolt and welded. In forming the bolt, the section formed by the rectangular cuts l is bent inward to approximately the thickness of the metal to form the indentation 6, Figures 4 and 5, for the purpose hereinafter mentioned. This operation completes the forming of the bolt and requires no further shaping or machining to fit it into sliding position within the casing.

The casing is blanked out from sheet metal in the form of a fiat strip 2*, Figures 7 and 7 with screw holes I, semi-circular or U-shaped cuts to form lugs 8 which project laterally toward the longitudinal center of the plate, and an elongated U-shaped perforation extending longitudinally at the center of the plate and forming a spring blade or tongue 9. This blank is bent into finished shape by a forming die which imparts to the blank the semi-cylindrical body part 2 and the fastening flanges 2 and in the same operation the tongue 9 is given an inward bend so that it projects approximately the thickness of the metal below the inner surface of the body part 2 as seen in Figure 5. In the same operation of the die while imparting the semi-cylindrical form to the body part 2, lugs 8 are forced back into the plane of the flanges 2 so that in the finished casing the lugs will project inward toward the longitudinal center of the body part 2 in the same plane as the flanges 2 as see-n in Figure 3.

The arcs of the formed bolt and easing are struck from the same center, and the radius of the bolt arc is such that it will have a sliding fit in the arc of the casing and will be held in sliding contact therewith by the lugs 8 which also serve as bearings for the bolt. It will be observed that by this construction and assembly the bolt will not only have a smooth sliding fit within the casing, but since the lugs 8 are in the same plane as the casing flanges, the bolt will not come into contact with the door or other surface to which the casing is secured. The purpose of the tongue 9 of the casing is to serve as a pressure spring on the bolt to retain it in either the locked or unlocked position, and by abutting against the shoulder formed by the indentation 6 prevents withdrawal of the bolt from the casing as seen in Figure 5.

The keeper 3 is blanked from sheet metal of the same gauge as the casing in the form of a flat strip 3 Figure 8, with screw holes Iii and lugs I I corresponding to the screw holes and lugs 'I and 8 of the bolt casing. The lugs I I project inward and downward as in the casing blank, as seen in Figure 7 and when the blank is shaped by the forming die into the semi-cylindrical body 3 with fastening flanges 3 Figure 2, the lugs II are forced back into the plane of flanges 3 as seen in Figure 2. The purpose of the lugs on the keeper is to insure a close sliding fit for the end of the bolt in the keeper and without the bolt contacting with or marring the surface to which the keeper is secured.

It will be observed by reference to Figure 5, that in sliding the bolt into locking position, if the surface to'which the casing is secured is out of alignment with the surface to which the keeper is secured as indicated in Figure 5, the curved nose of the bolt will wedge into the keeper to force the bolt casing into alignment with the keeper, andit will be noted that the arc and length of the nose is such that the semi-cylindrical part of the bolt will be within the near edge of the keeper before the leading edge of the bolt reaches the near edges of lugs I I so that the bolt will be free to slide over the lugs and fully into the keeper without interference with the lugs, and will be held in the keeper against lateral movement therein. Also it will be noted that in forming the bolt from a fiat sheet of metal into the semi-cylindrical form with the curved nose, the outer edge of the metal is drawn up forming a bevel as indicated at I2 in Figures 2, 3 and 5, and that due to this bevel and the curve of the nose the bolt will readily slide up on the lugs II of the keeper in case the keeper and bolt casing are out of alignment oppositely to the un alignment indicated in Figure 5.

From the foregoing it will be seen that I have produced a door bolt of the fewest possible number of parts of minimum weight for a given size bolt, and of maximum strength due to its hollow arched form, and capable of being manufactured in any desired size for a large variety of uses at minimum cost.

What I claim is:

1. In a door bolt, the combination of a casin the bolt, and the bolt shaped into semi-cylindrical form enclosed by and having a sliding fit within the casing and having a curved leading edge, a tail piece to serve as the operating knob, and an indentation positioned for engagement by said tongue to check withdrawal of the bolt from the casing.

2. A door bolt comprising a casing and bolt made of sheet metal, the casing being a single piece formed into a semi-cylindrical body having laterally projecting fastening flanges, a tongue forming a pressure spring and detent integral with said body part and bent slightly inward to serve as a retarding spring blade for the bolt, and lugs integral with said body part and projecting inward in the same plane as said flanges, and a bolt formed from a single piece into a semi-cylindrical body whose cross-sectional dimension is such as to provide a sliding fit within said casing body and retained in sliding contact by said lugs, and said bolt having an arched leading edge, a tail piece formed into an operating knob, and a longitudinal indentation forming a shoulder positioned for engagement by the tongue of the casing body to check withdrawal of the bolt from the casing. V

3. In a door bolt as defined in claim 1, a casing comprising a substantially rectangular plate shaped to form a semi-cylindrical body extending longitudinally the entire length of the plate with laterally projecting fastening flanges perforated with screw holes, a U-shaped out out on the semicylindrical part of the body forming a tongue extending longitudinally thereof, and a plurality of U-shaped cuts at both sides of the longitudinal center of the body forming lugs projecting inward in the same plane as said flanges.

PLATON LAZARIDES,

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