US2374840A - Rotary bolt for door latches - Google Patents

Description

May 1, 1945.v R. SCHONITZER 2,374,840

ROTARY BOLT FOR DOOR LATCHES Filed Nov. 19, 1941 2 Sheets-Sheet 1 VENTOR: Ruooa PH 1. 5ua-rrzzn BY M 7 1/0119 A-r-roR YS.'

May 1, 1945.

R. l. SCHONITZER ROTARY BOLT FOR DOOR LATCHES Ffiled NOV. l9, 1941 2 Sheets-Sheet 2 VENTOR: RUDOLPH I. 8c HON/TZER Patented May 1, 1945 UNITED STATES ?ATENT OFFICE iROTAR-Y BOLT FOR DOOR'LATCHES Rudolph I. Schonitzer, Shaker Heights, Ohio Application November 19, 1941, Serial No. 419,665

2 Claims.

This invention relates to an improved rotary latch bolt and to a method of making such bolt. More particularly, the invention relates toa rotary bolt for use in a door latch of the type disclosed in United States Patent No. 2,224,512, issued December 10, 1940, to W. A. Endter.

'The door latch illustrated and described in the aforesaid Endter patent includes a rotary bolt having, as integral parts thereof, a dogging portion and a latching portion. The dogging portion of the bolt consists of a plurality of peripherally spaced dogging heads adapted to be successively engaged by suitable dogs during respectively' successive operations of the latch; and the latching portion of the bolt consists of a. plurality of peripherally spaced latching heads adapted to be successively moved into latching engagement with a suitable keeper on a complementary structural element during the aforesaid respectively successive operations of the latch, there being a latching head corresponding to each dogging head. As a result, on engagement of the keeper by a latching head, the corresponding dogging head is simultaneously engaged by one or more cooperating dogs. The said dogs are movable to spring biased abutting relationship with the dogging head to maintain latching engagement of a latching head with the keeper, and, on subsequent operation of a door handle (opera tively associated with the said dogs), the dogs are displaced to permit rotary motion of the bolt,

whereby the said latching. head may be rotated out of latching engagement with said keeper. Reference may be had to the above mentioned United States PatentNo. 2,224,512 for a more detailed description of a door latch of the type hereinabove briefly referred to.

The object of the present invention is to provide a novel and improved rotary, bolt of the type above discussed and wherein the dogging and latching portions of such bolt are assembled from r a plurality of separately formed laminations.

A further object is the provision of a rotary bolt of laminated construction and wherein the several constituent laminations may be preformed to final cam contour prior to assembly thereof.

A further object is the provision of a rotary bolt of the laminated character heretofore re ferred to. and wherein the laminations thereof are securely interlocked to form a unitary struc-.- ture. p

A further object is the provision of a rotary bolt of laminated form, the clogging portion thereof being assembled from a plurality of laminations each adapted to be individually fabricated thereof may be formed from unlike'materials,

with such unlike lamir'iations alternately positioned, if desired, in the assembled structure.

Still another object of the invention is the provision of novel and improved steps in a method of manufacture of. a rotary bolt such as heretofore described.

Other objects and advantages of the present invention will be obvious, or will appear as' the description thereof proceeds. p

In the accompanying drawings, Figs. 1 and 2 are fragmentary views of a door latch of thetype disclosed in the'a foresaidEndter patent but'in- Chldll'lg a rotary bolt, of laminated form embodying the present invention, Fig. 1 being partlyin section and partly inelevation and Fig. 2 being a section on the line 2-2, Fig. 1; Fig. 3 is a perspective, View of the: present improved rotary bolt; Fig. 4 is an exploded view, in side elevation and, on an, enlarged scaleof the several elements of said rotary, bolt, the two locking pins there shown being in their pre-locking form; Fig. 5 is a side elevation of one of the laminations of the dogging portion of the rotary bolt, as viewed from the line 5-5. of Fig. 4; Fig. 6 is a side elevation of the centraldisk which separates the latching portion of the'bolt from the dogging portion thereof.

as viewed'from the line;68 of Fig.4; Fig.7 is a side elevation pf one Of the laminations of the latching portion of thebolt, as viewed from the the view being on the line 3-4! of Fig. 2.

Before thepresent invention is describedin detail, it is to be understood that such invention is not limited tcthe details of construction or the specific arrangement of partsherei-n illustrated or described, as the invention obviously may take other forms. It also is to be understood that the phraseology or terminology herein employed is for the purpose of description and notof limitation, the scope of the present inventionbeing indicated by the claims.

Referring first to Figs. 1, 2 and 3, the'refcrence numeral l0 designates generally a rotarybolt embodying the present invention, said boltbeing mounted for free rotation on a stub shaft I l fixed in'a latch housing l2 carried by a door l3. 1 One vention is not limited thereto.

end portion I4 of said bolt, the outer end portion when the bolt is mounted in place, constitutes the latching portion thereof, and the other end portion I5 of said bolt constitutes the dogging portion'thereof. Each of such portions includes a series of peripherally spaced heads, there being four latching heads which are adapted for cooperative engagement with a keeper (not shown) on the door frame (not shown), and a corresponding number of dogging heads for cooperative engagement with aseries of dogs l6 swingably suspended on a pin I! carried by the latch housing I2. operation of the several parts Just referred to need not be given herein, as such a description will be found in the'aforesaid Endter Patent No. 2,224,512. For the disclosure of this invention, it is suflicientto here state that when the door I3 is moved to closed position, one of the latching heads 26 of the bolt I I) rolls'into engagement with the keeper, and simultaneously, one of the dogging-heads I8 of the bolt moves into cooperative engagement with the dogs I6, as shown in Fig. 2. In such position of theparts, rotation of the bolt is prevented, and -the'door is thus latched in A detailed description of the function and and the laminations 22 which make up the latching portion thereof, said disk closing the opening in the latchhousing l2 through which'the bolt extends, as indicated in Fig. l, and preventing dirt and the like from accumulating on the interior parts of the latch, as will be readily understood.

As clearly shown in the accompanying drawings, the plate elements 22 and'23 and the disk 2| are each provided with a centralbore 24 for the reception of the. stub shaft upon which they are mounted when assembled to form the bolt I0. Each of said plate elements 22 and 23 and the disk 2| is also provided, around its central-bore 24, with a series of apertures 25, each such series here comprising. four apertures, al-

though the number thereof obviously may be varied. As here shown, the apertures of the closed position, the springs I9 which engage said dogs tending to constantly rotate the bolt into latchingposition. To open the door, the dogs I6 are moved out of their cooperative engagement with the dogging portion of the latch-bolt, by operation of the handle (not shown) for the door I3, as will be understood and as specifically pointed out in the aforesaid Endter patent.

In prior; latches of the character here involved, the rotary bolts have been in the formof one piece metal members, such as diecastings or the like The present improved "rotary bolt I0, however, is of laminated form, being assembled from a plurality of preformed. laminations of any suitable sheet material such as metal, fibre, plastic and the like, or any combination of suchmaterials, thev several laminations being. effectively maintained in rigid assembly in the manner and by the means to be hereinafter referred to.

. -As clearly shownin the accompanying drawings, the rotary bolt I!) here chosen for illustration has its latching portion I4 made up from a series of plate elements 22, and itsdogging portion l5 made up from a series of plate elements 23. Although-the number of plate elements in each of said series may vary, as desired, there are five plate elements in each series in the present embodiment of the invention. As clearly shown in Fig. 5, the five plate elements 23 which make up the dogging portion l5 of the rotary bolt have their peripheralcontours shaped to-provide dog-.-

ging heads for use with the dog H5, and as clearly shown in Fig. 7, the fiveplate elements 22 which make up the latching portion I4 of the rotary bolt have their peripheral contours shaped to provide latching heads for use with the latch keeper (not shown). Although thepresentinvention is not limited thereto, theseveral plate elements 22 which make up the latching portion I4 of the bolt are of identical form and hence are interchange able; Similarly, the several plate members 23 'which'make up'the dogging portion I5 of the bolt areof identical form and hence are interchangee able. However, as here shown, the plate elements 22 differ from theplate elements 23 in peripheral contour, ,althoughas just stated, the present in- If desired and as here shown, a disk 2| may be interposed between the laminations 23 which make up the dogging portion of the rotary bolt plate elements 22 and 23 are located in the heads thereof, although the present invention is not limited to such a location therefor.

,As shown in the accompanying drawings, the plate elements 22 and the plate elements 23 are disposed on opposite sides of the central spacing disk 2|, with the central bores thereof in alignment and with the apertures. 25 thereof in registry. Extending throughe'ach set of registered apertures 25 is'a loplringpin 27, the ends of the pinsbeing headed over, as shownin Fig. 8, ,to maintain the plate elements 22 and 23 and the spacing disk 2I.in rigidass'embly. If desired and as here shov'rn, the outer faces of the two end .plate elements, designated" by the reference numerals 28 and 29,,may be recessed, as at 30, around the apertures 25'fthereof to receive the heads of the pins 21,. to thereby provide a rotary bolt with flat end faces, asfshown in Fig.8. Also,

. if desired and as here shown, the outer peripheral heads than thelatching portion, or said heads may be an'gularly displaced to such an extent, by reason of the position ofthe keeper or the dogs, that it is impossible to locate the apertures 25 in the latching and dogging heads while still maintaining registry of said apertures in both the latching and do ging portions. .In this'event,

the apertures may beidisp'osed in someother:1oca tio'n, for instance closer to the central bore, whereby registry of the apertures can still be effected.v

While the plate and disk elements herein'above.

describedmay be formed from metal, such as the various available ferrous metals and alloys, one satisfactory material beinga grade of mild steel, other materials of sufiicientrigidity and otherwise desirable characteristicsare suitable, such ascertain grades of fiber board, raw hide, papi'ermach, etc. There is this available a wide range of materials for selection, affording a choice, for

instance, of various types of surfaces from which the user may obtain gre ater durability, longer wear, silent operation, or such other properties as may beeh'ara'cter'istic of the partieidar materialor'materials selected.

vention.

The latch fragmentarily shown in Figs. 1 and 2 has three dogs l6 which function, as already described. It may be noted that as here shown, the width of the contacting face of a do I6 is greater than that of any single lamination of the dogging portion of the bolt, three dogs equalling, in lateral extent, four such laminations. While certain structural advantages may attend this arrangement, the present invention is not limited thereto, but embraces a rotary bolt wherein each lamination of the dogging portion of the bolt has a corresponding dog, substantially coextensive in lateral extent therewith; and wherein the cam contour of neighboring laminations, which thus function with neighboring dogs, may vary progressively to produce a progressive advance in the order in which the dogs take hold, thereby decreasing the initial frictional resistance attendant upon simultaneous engagement of all dogs. With a bolt of such construction, the dogs may be identical size and contour, as will be readily understood.

Although the several structural elements of a rotary bolt such as above described may be fabricated and assembled in a number of ways, one such method is as follows:

A strip of plate of suitable material is first provided with a succession of grouped openings, each group comprising a centrally located bore 24 and a plurality of apertures 25 spaced therearound. Said plate or strip is then subjected to a further stamping operation so as to produce a plurality of plate-like member (Figs 4 to 7 inclusive) of the desired peripheral contour, each such member including a plurality of apertures 25 and a central bore 24. For the form of rotary bolt here disclosed, three types of such stamped elements will be provided, consisting respectively of latching elements 22, dogging elements 23 and disk-like elements 2|. Where extreme precision is desired, the plates thus formed may be subjected to a shaving operation on their peripheries and central bores to remove any taper which may be present, etc. If desired, the several plates may be flattened in a suitable press at any suitable stage in their manufacture to eliminate any deformation or warpage resulting from any of the preceding fabricating steps. A minor proportion of the plates, namely, those for use as end plates, may have their spaced apertures countersunk on one face and their peripheral edges rounded or beveled on the same face by a coining operation.

A group of plate members, fabricated as aforee said, and consisting of a matchedset of latching elements 22 and a matched set of dogging elements 23 are assembled respectively On opposite sides of a disk 2| in the manner indicated in Fig. 4 and held in assembled, stacked relationship by any suitable means, with the central bores 24 in alignment and with the apertures .25 in registry. Pins 21 are then inserted through the registered apertures 25, said pins preferably fitting snugly to maintain the ,arranged position of the plate members, and the pins extending beyond the outer surfaces of the two end plates sufiicient distances for the heading operation now to be described.

The assembly may then be placed upon a base plate suitably recessed to receive and align the bottom protruding ends of pins 21, while the upper protruding ends are headed into the countersunk recesses of the end plates 28 and 29 by using a suitable perforated pressure plate in conjunction with heading plungers. The unit may then be reversed, and supported on a fiat base while the other ends of the pins are similarly headed. A completed unitjthus asseme bled and rigidly locked, may, if desired, be subjected to a tumbling operation and may then, if desired, be cadmium plated or zinc plated.

Further features and advantages of the present invention will be readily. apparent to those skilled in the art to which the present invention relates. I

What I claim is:

l. A rotary latch bolt comprising a latch portion for cooperative engagement with a keeper, a dogging portion for cooperative engagement with a series of identical dogging elements, each said portion comprising a series of laminations,.

each of the laminations of the latching portion having a series of peripherally spaced latching heads, and each of the laminations of the dogging portion having a series of peripherally spaced dogging heads, there being a respective dogging element disposed to individually engage a dogging head of each lamination, the corresponding engageable surfaces of the series of dogging head laminations being progressively offset, each from the next, whereby to secure a respectively progressive advance in the order in which each dogging element engages its respective dogging head during one operation of said latch bolt.

2. A rotary latch bolt comprising a latch portion for cooperative engagement with a keeper, a dogging portion for cooperative engagement with a series of identical dogging elements, each.

said portion comprising a series of alternate metallic and non-metalliclaminations, each of the laminations of the latching portion having a series of peripherally spaced latching heads, and each of the laminations of the dogging portion having a series of peripherally spaced dogging heads, there being a respective dogging element disposed to individually engage a dogging head of each lamination, the corresponding engageable surfaces of the series of dogging head lamina-

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