US2477524A

US2477524A - Spring bolt

Info

Publication number: US2477524A
Application number: US758296A
Authority: US
Inventors: Joseph H Oswald; Theodore E Weil
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-07-01
Filing date: 1947-07-01
Publication date: 1949-07-26
Anticipated expiration: 1966-07-26

Description

July 26, 1949.

J. H. OSWALD ET AL SPRING BOLT Filed July 1, 1947 INVENTORS ATTORNEY Patented July 26, 1949 UNITED STATES ATENT OFFICE Eoseph H. Oswald, SouthEuclid, and Theodore E. Well, Willoughby, Ohio Application .iuiy 1, 1947, Serial No. 758,296 3 Claims. (01.292-175) The invention relates to locking or fastening devices of the spring bolt type.

It is an object of the invention to produce a spring bolt which can easily be mounted in a wood window sash or other panel structure by simply forcing it into a hole drilled to receive it and which is not likely to. loosen or be dislodged in use. 7

Another object of the invention is to provide a spring bolt having parts that can be manufactured at low cost and easily assembled to produce a device that is both rugged and durable and unlikely to get out of order.

With these ends in view the invention consists in certain forms, combinations and arrangements of parts which will, hereinafter be eX- plained and claimed, the explanation being presented in conjunction with the accompanying drawing showing a preferred formof the various constructions in which the invention can be embodied.

In the drawing,

Fig. 1 is a fragmentary inside elevation of a window sash and frame with the improved spring bolt mounted in the sash.

Fig. 2 is a view on a larger scale of the unmounted spring bolt, the view being partly in longitudinal axial section and partly in side elevation.

Fig. 3 is a section on the line 3-3 of Fig. 2.

In the construction shown in the drawing A (Fig. 1) designates a portion of a window frame, 33 part of the stile of an associated window or storm sash and C designates generally the improved spring bolt mounted in the sash. The construction of the spring bolt is shown in detail in Figs. 2 and 3 where the numeral I designates as an entirety a tubular casing which is formed at one end with an inturned flange la. Adjacent one of its ends the casing i has an annular portion of its exterior surface knurled and preferably this knurling is disposed adjacent the end of the casing remote from the flange la, as is shown at lb in the drawing. This knurling of the casing is carried out in a manner to raise sharp edges so that the overall diameter of the knurled zone is slightly (preferably about 0.020) greater than the diameter of the unknurled part of the casing.

Slidably mounted in the casing I is a round bolt designated as an entirety by the numeral 2 and having a portion 2a of larger diameter than a second portion 2b with a resultant shoulder 20 at the junctions of these two portions. Adjacent the larger portion 2a the bolt is formed with a 2 conical taper 202 which terminates in end 2e.

A coil spring 3. preferably of stainless steel, surrounds portion 21) of the bolt with one end of the spring engaging the shoulder 20 of the bolt and its other end engaging the flange la of the casing. i

The bolt is fitted with a handie member 5 which in the construction shown is of straight rod-like form and has at one end an axial hole Ala drilled of a size to fit the end of the smaller sections of the bolt which projects beyond the flange la of the casing. To fasten the handle rigidly to the bolt the latter is notched and the handle islolcaily deformed to interlock with the notch. Preferably two such interlocking engagements are provided by oppositely arranged notches 2122 in the bolt and corresponding indented portions ib, ib of the handle.

A spring bolt structure such as that shown and described is susceptible of manufacture at remarkably low cost. All of the parts except the spring 3 are preferably formed of brass and with the exception of two operations the parts can be rapidly produced on automatic screw machines. The casing l is, of course, formed from tubing and can have its knurled zone lb rapidly formed. The flange la of the casing can be formed by a combined cutoff and spinning operation. The bolt 2 and handle 4 are formed from plain round rod stock and their several forming operations are obviously well suited to screw machine work except for the notching of the bolt and the deforming of the handle to efifect its attachment to the bolt. These latter two operations, however, are readily carried out. The notching of the bolt 2 is effected by holding the cylindrical bolt in a die having a cavity of corresponding shape so that when the metal of the bolt is deformed to produce the opposite notches 2f the displacement of the metal is accommodated by endwise movea rounded ment in the die so that the overall diameter of I the bolt is not altered. The deforming of the handle part to effect its interlock with the bolt is obviously a simple and easily performed operation.

The use of a stainless steel sprin has a marked advantage over a bronze spring by reason of its longer life Without loss of form; and the cost of the stainless steel spring is as low or lower than that of a good bronze spring.

In the use of the spring bolt a hole is drilled in the window sash of a diameter equal to the outer diameter of the unknurled part of the spring bolt casing. With the form of spring bolt which with great firmness so that it cannot be dislodged in the ordinary use and operation of the device. It has been observed that the eiiect oi the knurled surface of the bolt casing, when the casing is inserted in the sash, is that the sharp metal edges thrown up by the knurling operation shave a thin layer of the wood from the hole surface and compact it between the casing and the solid wood. 'Thus in effect a tight pressed fit is attained with :respect to the relatively narrow knurled band 'while a less tight, but firm, fit is secured between the remainder of the casing member and the 7 Wood of the sash.

It'will be appreciated that the manner of attaching the handle to the spring bolt effects a strong and rigid connection which cannot be loosened for either endwise or rotary relative movement of the parts to'cause trouble in the use of the device. A series of handle members can be formed of different lengths (by varying the dimension :0 indicated in Fig. 2 0f the drawing) and simply by the use of'these handles of different lengths spring bolts suited to sash stiles of different widths can be produced without varying the dimensions of the other parts of the device. It will be understood that the specific form of 4 construction which has been shown in the draw ings and described, is presented for the purposes of explanation and that the structures shown can be modified in various respects without departing from the invention as defined in the appended claims.

What is claimed is:

1. In a spring bolt, the combination of a tubular casing formed at one end with an inturned flange and having adjacent one end an annular zone of its outer surface knurled to an over-all diameter somewhat larger than the diameter of its unknurled surface; a round bolt in the casing formed with two portions of different diameters separated by an annular shoulder facing the inturned flange of the casing, the bolt having its larger portion slidably fitting the casing and its smaller portion projecting from the flanged end of the casing and laterally notched to receive a handle; a coil spring surrounding the smaller portion of the bolt with its ends engaging the shoulder of the bolt and the flangeof the casing, respectively; and a handle for the bolt formed with a hole to receive the notched portion of the bolt and deformed to have interlocking engagement with the notch.

2. A spring bolt as claimed in claim 1' in which the knurled surface of the casing is adjacent the end of the casing remote from its inturned flange.

3. A spring bolt as claimed in claim 1 in which the knurled surface of the casing is adjacent the JOSEPH H. OSWALD. THEODORE E. WEIL.

' No references cited.