US3545031A

US3545031A - Cam operated hinge assemblies

Info

Publication number: US3545031A
Application number: US672801A
Authority: US
Inventors: Harold J Dielman
Original assignee: SANYMETAL PRODUCTS CO Inc
Current assignee: MANUACTURERS HANOVER TRUST Co
Priority date: 1967-10-04
Filing date: 1967-10-04
Publication date: 1970-12-08
Anticipated expiration: 1987-12-08

Description

Dec.8,`1970 H.J.D|ELMAN 3,545,031

` CAM OPERATED HINGE ASSEMBLIES Fi'leaocf.v 4, 1967 4 sheets-sheet 1 RIGHT HAND LEFT HAND DOOR DOOR INVENTOR.

vHAROLD I. D/ELMAN Dec. s, 1970 H. J. DIELMAN 3,545,031 CAMv OPERATED HINGE ASSEMBLIES 4 Sheets-Sheet 2 Filed Oct. 4, 1967 IN VENTOR.

HAROLD J D/ELMAN /1 Hol-rl cg Dec. 8, 1,970 H. .L DIELMAN CAM OPERATED HINGE ASSEMBLIES 4 Sheets-Sheet FIG. 22

Filed Oct. 4, 1967 FIG. 23

S Rm .mf m mM N NH El VD 0a T ..N..J. T D A L l m 7 6 M 2 v.. B G M :Il

Dec. 8, 1970 H. J. DlELMAN CAM OPERATED HIYNGE ASSEMBLIES l4 sheets-sheet 4.

Filed Oct. .1, 1967 I NVENTOR. HAROLD J- DIELMAN ATTORNEYS United States Patent O 3,545,031 CAM OPERATED HINGE ASSEMBLIES Harold J. Dielman, Lyndhurst, Ohio, assignor to The Sanymetal Products Company, Inc., Cleveland, Ohio, a corporation of Ohio Continuation-impart of application Ser. No. 432,950, Feb. 16, 1965. This application Oct. 4, 1967, Ser. No. 672,801

Int. Cl. E051? l 06 U.S. Cl. 16--153 23 Claims ABSTRACT OF THE DISCLOSURE The disclosure relates to cam operated hinge assemblies or gravity hinges in which the door and doorframe hinge parts are symmetrical with respect to a horizontal median plane and are thus adapted for reversible installation on either right or left hand swinging doors. -Each hinge assembly is provided with a tubular riding sleeve on the door hinge part which is vertically shiftable on a pintle mounted on the doorframe hinge part. A nonrotatable cam member cooperates with a riding or rotating cam member carried on the tubular riding sleeve to raise the door on its hinge assemblies as it is swung from a predetermined residence position and to automatically return the door when released to the residence position.

This application is a continuation-in-part of a copending U.S. application Ser. No. 432,950 tiled Feb. 16, 1965, and now abandoned.

Cam operated or gravity hinge assemblies made in accordance with this invention are particularly designed for exterior application to relatively thin door bodies and doorframe members or pilasters, having a thickness in the order of 1 or 2 inches, and forming component parts of interior space dividing compartments and cubicles. In such installations, the doorframe members or pilasters may be fixed to the building oor and/or building ceiling, and the door bodies positioned therebetween are usually spaced twelve or more inches from the building iloor to facilitate floor cleaning. Such door bodies may be advantageously mounted for smooth and substantially frictionless movement to and from a predetermined residence position by the use of upper and lower hinge assemblies of the type disclosed herein which mount the door on the adjacent doorframe member.

Heretofore, gravity hinge assemblies applicable to reversible installation may employ a door mounted hinge part having a sleeve closed on one end and therein provided with an interior annular cam track cooperable with a complementary annular cam track on one end of the hinge pintle which is encircled by the sleeve. In this type of hinge the door and doorframe hinge parts are inverted in the upper and lower hinge assemblies, i.e., the sleeve of the door mounted hinge part opens downwardly when installed in an upper hinge assembly, but opens upwardly when used in a lower hinge assembly. In the latter case the hinge pintle is removed and a normal pin without a cam track on one end is substituted therefor which pin merely holds the rotational alignment of the lower hinge assembly while only the upper hinge assembly performs as a gravity hinge.

In the present invention reversible application is attained with fewer hinge parts while providing that both door hinge assemblies are gravity operated to assure a more positive door lifting action and automatic return to the residence position upon release of the door.

In accordance with the invention, a gravity hinge is provided comprising, in combination, a supporting hinge part designed for securement to a doorframe member and presenting a pair of spaced supporting bosses, a swinging hinge part designed for securement to a door and presenting a tubular riding sleeve which is designed to reciprocate between the space supporting bosses, a hinge pintle extending through the tubular riding sleeve, a riding cam member carried by the tubular riding sleeve of the swinging hinge part and a cooperating nonrotatable cam member engageable with the riding cam member to reciprocate the swinging hinge part on the hinge pintle during opening or closing movement of the door body.

In one form of the invention, the nonrotatable cam member comprises an inclined cam track formed in the cylindrical body of the hinge pintle and the riding cam member comprises a cam pin fixed to the tubular riding sleeve which extends into the cam track.

In this form of the invention the interior surface of the tubular riding sleeve provides a journal-forming bore for the hinge pintle extending axially therethrough. By loosening fasteners holding the ends of the hinge pintle to the axially spaced bosses of the supporting hinge part,

the hinge pintle can be rotated to thereby orient the cam track to a position which will selectively establish the residence position of the door.

In another form of the invention the nonrotatable cam member is a cylindrical cam having an annular cam track on one end. The cylindrical cam is iixed to the hinge pintle and extends into the cylindrical bore of the tubular riding sleeve so that the outer surface of the cylindrical cam provides a journalled support for the riding sleeve. The riding cam member has an annular cam track and an axial bore through which the hinge pintle extends and is secured within the riding sleeve. The adjacent ends of the cylindrical cam and riding cam member present their respective annular cam tracks in complementary fashion so as to raise the door when swung from its predetermined residence position. By loosening and rotating the hinge pintle to which the cylindrical cam is xed, the latter can be rotated to thereby selectively orient its cam track to a position which will selectively establish the residence position of the door.

In still another form of the invention, the tubular riding sleeve of the door hinge part receives a riding cam sleeve having an interior cam track and a central bore through which the hinge pintle extends. A cylindrical cam is secured to the lower boss of the doorframe hinge part and extends into the riding cam sleeve for camming engagement with the interior cam track and has a central bore aligned with that in the riding cam sleeve to receive and journal the end of the hinge pintle. By loosening the cylindrical cam member and rotating it relative to the hinge pintle and riding cam sleeve the proper residence position of the door may be selected.

Each of the cam operated hinge assemblies is constructed in accordance with the invention so as to facilitate the hanging of either right or left hand swinging doors. This is accomplished by providing that the door and doorframe hinge parts are each symmetrical about a median plane so that the hinge assembly will perform its intended function of a gravity hinge whether mounting a left or right hand swinging door. Also, in the two forms of the invention rst described, certain component hinge parts are symmetrically formed so that it is necessary only to shift or rotate a hinge component with respect to its associated door or doorframe hinge part to accomplish reversible installation.

The form of the invention last mentioned accomplishes reversibility by providing that the riding cam sleeve is received in the cylindrical bore of the tubular riding sleeve of the door hinge part in either open end thereof. Reversible installation is accomplished merely by withdrawing the riding cam sleeve, inverting the tubular riding sleeve end-for-end and reinserting the riding cam sleeve.

An object of the invention is to provide a gravity hinge which can be quickly assembled and applied to factory made door bodies an pilasters with accuracy and precision, in minimum time and with minimum assembly and installation labor.

A further object of the invention is to provide a gravity hinge assembly composed of relatively few parts which can be economically die cast, molded, stamped and/or machined to the required form, and which hinge components can be made, in large part, from thermoplastic or thermosetting synthetic resin materials which can be economically molded and quickly assembled for mounting attachment with the die cast or stamped'door and doorframe hinge parts.

Another object is to provide a gravity hinge assembly capable of reversible application in which both the upper and lower door hinge assemblies are gravity operated.

Still another object is to provide a gravity hinge assembly, the hinge components of which rnay be loosened, adjusted to achieve the proper door residence position, and retightened to retain the desired residence position indefinitely.

Still a further object is to provide a gravity hinge assembly in which only the supporting hinge part and the swinging hinge part are symmetrical with respect to a median plane while the hinge pintle and cam members are adapted for insertion in either end thereof.

Other objects and advantages of the invention will become apparent by referring to the following description and drawings wherein:

FIG. 1 is an elevational view of a cam operated hinge assembly made in accordance with this invention, this view also showing adjacent fragmentary parts of the door body and supporting pilaster to which this hinge assembly is attached;

FIG. 2 is a top plan view of the hinge assembly as the same would appear when viewed along line 2-2 of FIG. 1, this hinge assembly may be secured to the door body and adjacent pilaster body;

FIG. 3 is an elevational view, partly in section, of the hinge assembly as the same would appear when viewed along line 3 3 of FIG. 2, this view showing in section further details of the riding sleeve, the spaced pair of supporting sleeves, the hinge pintle, an outline of the complementary cam slots formed in the cylindrical body of the hinge pintle, the assembly screws, and associated grip caps which adjustably secure the end portions of the hinge pintle to the spaced pair of supporting sleeves;

FIG. 4 is a perspective view of the component parts of the hinge assembly in exploded relation;

FIG. 5 is an elevational view of the rear face of the hinge assembly, showing further details of the mounting studs which project from the rear face of the pilasterattaching and door body-attaching wing leafs, this view also showing the spaced holes in the rear boss portion of the riding sleeve into which a camming pin is selectively inserted;

FIG. 6 is a plan view of the hinge assembly as it would appear When in open position and unattached to the door body and pilaster body;

FIG. 7 is an elevational view, partly in section, of the opened hinge assembly as the same would appear when viewed in the direction of the arrows along line 7 7 of FIG. 6, this view showing the camming pin as externally applied to the riding sleeve and with its end extension in camming contact with the cam track of the upper camming slot formed in the cylindrical body of the hinge pintle;

FIG. 8A illustrates a fragmentary elevational view of a hinge pintle of modified construction, and FIG. 8B is an end view thereof;

FIG. 9A illustrates an elevational view of the grip cap, FIG. 9B is a plan view of one end thereof, and FIG. 9C is a plan view of the other end thereof; and

FIG. 10 is a development diagram of the complementary cam slots formed in the cylindrical body of the hinge pintle.

FIG. l1 is an elevational view of a modified form of cam operated hinge assembly made in accordance with this invention, this view also showing adjacent fragmentary parts of the door body and supporting pilaster to which this hinge assembly is attached;

FIG. 12 is an elevational view of the rear face of the modified hinge assembly, this view showing further details of the mounting studs which project from the rear face of the pilaster-attaching and door-attaching wing leafs, and the set screw in the riding sleeve which maintains the axially shiftable riding cam in camming relation to the cylindrical cam member therebelow;

FIG. 13 is a transverse sectional view of the modified hinge assembly as the same would appear when viewed along line 1313 of FIG. 12;

FIG. 14 is an elevational view, partly in section, of the modified hinge assembly as the same would appear when viewed along line 14-14 of FIG. 13; this view showing further details of the tubular riding sleeve, the spaced pair of supporting sleeves, the hinge pintle, the spaced pair of cylindrical cam members fixed to the hinge pintle and on which the riding sleeve is telescopically journalled, and the riding cam adjustably secured to and within the riding sleeve and positioned in camming contact with the cam track of the cylindrical cam member therebelow;

FIG. 15 is a perspective view of the component parts of this modified hinge assembly in exploded relation;

FIG. 16 is an elevational view showing one side of the riding cam, FIG. 17 is an elevational view of another side of the riding cam, and FIG. 18 is a plan view of one of the complementary ends of the riding cam;

FIG. 19 is a plan view of the modified hinge assembly as it would appear when in open position but unattached to the door body and pilaster body; and

FIG. 20 is an elevational view of this opened hinge assembly as the same would appear when viewed along line 20--20 of FIG. 19;

FIG. 21 is a further modified form of the invention showing a fragmentary elevational view of a hinge assembly supporting a door hinged on the right side to a stationary pilaster;

FIG. 22 is a fragmentary plan view of the hinge assembly of FIG. 2l showing the residence position of the door in phantom lines;

FIG. 23 is a vertical sectional view of the hinge assembly taken along line 23-23 of FIG. 22;

FIGS. 24-26 show the positional relationships of the riding cam sleeve and cylindrical cam member with respect to their respective annular cam tracks;

FIG. 27 is an exploded view showing the relationship of the parts for assembly as a right hand hinge; and

FIG. 28 is a view showing the door and frame hinge parts reversed and partially assembled as a left hand hinge assembly.

Cam operated hinge assemblies constructed in accordance with this invention, can be made in any desired size and adapted to swingably support hollow metal of solid doors of any size and form. However, these hinge assemblies iind particular application to doors and pilasters of interior compartments and cubicles, Whose door bodies and associated door supporting frame members or pilasters are in the order of one to two inches in thickness. As an illustration, there is shown in FIGS. 1 and 2, the jamb edge portion of a door body 50 having a thickness of approximately one inch, and the adjacent jamb edge p0rtion of a doorframe member or plaster 40 having a thickness in the order of about one and one-half inchesl and one of the hinge assemblies of this invention applied thereto.

The door supporting frame member or pilaster 40 as exemplified in FIGS. 1 and 2 is commonly formed from a pair of yspaced sheet metal facing pans 41 41 presenting paired inturned flanges extending along the jamb edge thereof, and which are interlocked together by a semitubular edging strip as shown in FIGS. 1 and 2. Each hollow metal pilaster may contain a sound insulating and reinforcing core 43. As thus formed, the jamb edge of the door supporting frame member or pilaster 40 presents spaced corner portions 41--41 joined by a crown edge portion 42 to which the attaching section of the supporting hinge part conforms. 'Ihe door supporting frame member or pilaster 40 may otherwise be formed as a hollow metal tube which presents either a at jamb edge or a jamb edge which presents spaced corner portions 41 41 joined by a crowned edge portion 42 as indicated.

The door body 50 is also presently constructed from a pair of wall-forming facing pans 51-51 presenting paired inturned flange portions which are interlocked together by semi-tubular edging strips along all four edges thereof, thereby providing a hollow metal door body which may contain a sound insulating and reinforcing core 53. The jamb edge of the door body, where the attaching sections of the riding hinge parts of the upper and lower hinge assemblies are to be applied, would thus present spaced corner portions 51' 51' joined by a crown edge portion 52 to which the door-attaching sections of the riding hinge parts should conform.

In such cubicle and compartment installations, the upper and lower hinge assemblies should be so constructed as to permit swinging movement of the door body in a left hand or right hand direction, and to swing into the compartment or cubicle, or to swing exteriorly of the compartment or cubicle, as selectively desired. Since the lower end of the door body is normally spaced from the building oor, there is no obstruction to vertical movement of the door body as it swings to and from closed or adjusted residence position. The cam operated hinge assemblies of this invention, illustrated in the accompanying Adrawings and identified as types A and B, are designed and adapted for application to either right or left handed swinging doors. These hinge assemblies are provided with cam means which can be easily adjusted after the door body is swingably mounted, to establish any desired residence position of the mounted door body, as for example, the closed position shown in FIGS. l, 2, 3 and 5 and FIGS. 11-14 or the partially open position shown in FIG. 22. These hinge assemblies are also provided with means which establish the maximum open position for the mounted door, together with attaching sections designed to smoothly interfit with, and be rigidly secured to, the adjacent hinging edges of the door body and doorframe member.

The cam operated hinge assembly A as illustrated in FIGS. l-lO, includes a supporting hinge part a presenting a pair of spaced supporting sleeves 1 joined by a doorframe attaching section 5 extending laterally therefrom; a swinging hinge part a' which presents a tubular riding sleeve 11 designed to be axially aligned between the spaced supporting sleeves 1 1 and having a door-attaching section 15 extending laterally therefrom; and a hinge pintle telescoped through the tubular bore of the riding sleeve 11 and whose end portions are designed to be secured to the spaced supporting sleeves 1 1. The hinge assembly of this invention may be adapted for convenient application to both right and left hand swinging door bodies and associated pilasters by making the supporting hinge part a, the swinging part a' the hinge pintle 20 and other component parts of the assembled hinge, symmetrical in form and shape about a medial plane x-x extending at right angles to the longitudinal axis of the assembled hinge, as indicated in FIGS. l, 3, 4 and 5.

The spaced supporting sleeves 1 1 of the symmetrical supporting hinge part a are generally tubular in form and preferably similar and symmetrical in size and shape, as

indicated in FIGS. 1, 3, 4 and 7. Each symmetrical supporting sleeve 1 presents a transverse wall 2 positioned intermediate the ends thereof, and which has an axially extending bore 2 into which the adjacent end portion of the hinge pintle 20 is designed to extend. The intermediate transverse wall 2 defines an inner pocket 3 of tapered form into which the adjacent end portion of the barrel-shaped riding slee-ve 11 may telescope as shown in FIGS. 3 and 7. The outer face of the transverse supporting wall 2 defines a tapered outer pocket 3 which receives a locking cap 25 secured to the adjacent end of the hinge pintle 20 by an assembly screw 2S, and which may be manipulated to adjustably secure the hinge pintle 20 to the associated supporting sleeve 1.

The spaced supporting sleeves 1-1 of the supporting hinge part a are rigidly joined by an attaching section 5 which is designed for rigid securement to an adjacent doorframe member or pilaster 40. The attaching section 5 may be advantageously shaped in the form of a wing leaf integrally joined as by sturdy connecting necks 5 5 to the spaced supporting sleeve 1 1 as shown in FIGS. l-6. Each of the supporting sleeves 1 has a flat faced rear boss 4 which presents a vertical shoulder forming edge 4' as shown in FIGS. 1, 2, 5 and 6, designed to snugly abut the adjacent corne'r portion 41 of the doorframe member 40; and the wing leaf 5 presents a rear seating rim 6 designed to snugly seat against the adjacent side face of the doorframe member 40. The wing leaf 5 also presents a front face 7 which may be generally parallel to the rear seating rim 6, and which merges smoothly into the outer surfaces of the supporting sleeves 1 1.

A pair of spaced supporting studs 8 8 formed integral with and projecting at right angles from the rear face of the wing leaf 5 are designed for insertion into the corresponding spaced holes drilled into the doorframe member 40 as indicated in FIG. 2. The wing leaf 5 is preferably symmetrical about its medial axis x-x, as shown in FIGS. 1, 3 and 5, and its outer side edge may present an outwardly bulged contour of attractive shape as indicated in FIGS. 1-5. The spaced studs 8, extending from the rear face of the wing leaf S, are also preferably spaced equal distances from the terminal upper and lower ends of the wing leaf so that the wing leaf can be inverted end-forend and its studs 8 8 inserted into equally spaced holes drilled into the pilaster when positioned on either the right hand side or left hand side of the swinging door body 50. To maintain a harmonious design pattern, the supporting sleeves 1 1 may also be generally barrel shaped in exterior contour around the visible sides thereof, as indicated in FIGS. 1, 3 and 4, and which further adds to the strength and rigidity of the supporting sleeve construction.

The barrel shaped riding sleeve 11 of the symmetrical swinging hinge part a is generally tubular in form and symmetrically shaped about the axis x-x as indicated in FIGS. 1, 3, 4 and 7. The axially elongated tubular riding sleeve 11 has an axial bore 12 through which the body portion of the hinge pintle 20 extends, and which provides a vibration free journal for the angular swinging movement of the hinge part a and the door body secured thereto. To strengthen the tubular riding sleeve 11 and enhance its artistic appearance, the intermediate portion of the riding sleeve 11 may be outwardly bulged to thicken the intermediate portion of its tubular wall, and its upper and lower end portions 11' are preferably tapered in contour to selectively telescope into the adjacent inner pockets 3 3 presented by the similar upper and lower supporting sleeves 1 1. When the door body is in closed or residence position as indicated in FIG. 2, the tapered end portions 11 of the barrel shaped riding sleeve 11 may extend slightly into the entry ends of the upper and lower tapered pockets 3 3 of the supporting sleeves 1-1 as indicated in FIG. 3; and when the door body is in fully opened position the upper tapered end portion 11 of the riding sleeve 11 may substantially fully telescope into the tapered pocket 3 of the uppermost riding sleeve 1 as indicated in FIG. 7.

The rear face of the barrel shaped riding sleeve 11 of the hinge assembly A, as applied to the closed door body and adjacent pilaster as shown in FIG. 2, is provided with a flat-faced intermediate @boss 13 which is symmetrical With respect to the medial transverse axis x--x of the riding sleeve as shown in FIGS. 5 and 7. A pair of symmetrically spaced internally threaded sockets 14-14 extend into the boss portion 13 from the outer face thereof, each terminating in a reduced diameter bore extension 14 opening into the axial bore 12 of the riding sleeve 11, as shown in FIG. 7. The threaded sockets 14 and associated bore extensions 14 are designed to selectively receive and support a camming element as hereafter described.

The barrel shaped riding sleeve 11 of the swinging hinge part a is rigidly joined to an attaching section which is designed for rigid securement to the adjacent door body 50. The attaching section 15 may be advantageously shaped in the form of a wing leaf integrally joined as by a sturdy connecting neck 15 to the riding sleeve 11 as shown in FIGS. 1-6. The at faced intermediate boss 13 which projects from the rear of the elongated riding sleeve 11 presents a vertical abutment shoulder 13', as shown in FIGS. l, 2, 5 and 6, designed to snugly seat against the adjacent corner portion 51' of the door body 50. The rear face of the wing leaf 15 presents a seating rim 16 designed to snugly seat Vagainst the adjacent side face of the door body 50. The Wing leaf 15 also presents a front face 17 which may be generally parallel to the rear seating rim 16' and which merges smoothly into the outer surface of the riding sleeve 11.

A pair of spaced supporting studs 18--18, formed integral with and projecting at right angles from the rear face of the wing leaf 15, are designed for insertion into correspondingly spaced holes drilled in the door body 50 as indicated in FIG. 2. The wing leaf 15 is preferably symmetrical about its medial axis x-x, and its outer side edge may present an outwardly bulged contour of attractive shape as indicated in FIGS. l, 3, 4 and S. The spaced studs 18--18 extending from the rear face of the wing leaf 15 are preferably symmetrical, spaced equal distances from the terminal upper and lower ends of the wing leaf so that the wing leaf 15 can be inverted endfor-end and the studs 18-18 inserted into equally spaced holes drilled into the door body 50 when positioned on either the left hand side or right hand side of the supporter pilaster 40. To achieve a harmonious design pattern, the door body attaching wing leaf 15 is preferably similar in length, Width, shape, and form to the pilasterattached wing leaf 5, and the associated riding sleeve 11 preferably has a barrel shaped exterior contour around the visible sides thereof which is in harmony with the visible contours of the supporting sleeves 1-1.

The hinge pintle 20 of sturdy construction presents a cylindrical body section 21 designed to smoothly telescope into the axial bore 12 of the elongated riding sleeve 11, and the end portions of its cylindrical body section 21 are designed to extend into the axial bores 2 of the spaced supporting sleeves 1-1. The hinge pintle also presents a polygonally shaped head portion 22 at each end of its cylindrical body section 21 which are designed to project into the outer pockets 3-3' of the supporting sleeves 1 1, as shown in FIGS. 3 and 7.

The hinge pintle 20 is adjustably secured to the spaced supporting sleeves 1-1 by a pair of locking caps 25, each of which presents an inner polygonal pocket 26 shaped to snugly receive the adjacent polygonal shaped head portion 22 of the hinge pintle 20, and which cornmunicates with an outer conical pocket 26 designed to receive the tapered head portion 28" of an assembly screw 28, as shown in FIGS. 3, 4 and 5. The perimeter of each locking cap 25 is tapered in form and designed to be snugly pocketed Within the outer tapered pocket 3 as presented by the adjacent supporting sleeve 1. The tapered perimeter 25 of the locking cap 25 may be provided with longitudinal serrations of fine ribs as shown in FIG. 9C, designed to frictionally grip the tapered wall surface of the outer cap receiving pocket 3 of the supporting sleeve 1. The tapered inner wall surface of each pocket 3' may also be provided with complementary longitudinal serrations to increase the gripping effect.

The end assembly screws 28, each having a threaded shank portion 28 and a tapered head portion 28", are designed to adjustably secure the hinge pintle 20 and the associated grip caps 25 to the spaced supporting sleeves 1-1. The threaded shank portion 28 of each assembly screw 34 is designed to be threaded into an internally threaded bore 22' extending axially through the polygonal head portion 22 and into the cylindrical body 21 of the hinge pintle 20 as shown in FIG. 3, with the tapered head portion 28 of the assembly screw pocketed within the tapered outer pocket 26 of the adjacent locking cap 25. When the assembly screws 28-28 are loosened, the hinge pintle 20 may be rotated within the axial bore 12 of the elongated riding sleeve 11 and the axial bores 2 presented by the transverse walls 2 2 of the supporting sleeves 1--1. When the assembly screws 28-28 are tightened, the grip caps 25-25, as well as the hinge pintle 20, are rigidly fixed in position, for purposes which will now be described.

The cylindrical body section 21 of the hingey pintle is provided with an inclined cam slot 23 which spirals partially around the cylindrical pintle body 21 for a distance of somewhat more than ninety degrees, as shown in FIGS. 3, 4 and 7, and also indicated by the development diagram of FIG. 10. In the preferred form of this invention, the pintle body 21 presents a pair of complementary cam slots 23-23 of symmetrical shape and form and positioned on opposite sides of the medial plane x-x of the hinge pintle, and which adapts the hinge pintle for end-to-end inversion along with the other symmetrical parts of the assembled hinge, so that the assembled hinge can be applied to either right hand or left hand swinging door bodies and associated supporting pilasters Without the substitution of any component.

The adjacent ends 23 of the spaced cam slots 23 as shown in FIGS. 3 and 4 are so positioned as to align with the spaced cam pin receiving sockets 14--14 presented by the rear boss portion 13 and their bore extensions 14-14 which extend through the wall of the tubular riding sleeve 11, when the door body is in the residence position shown in FIG. 2. Before mounting the hinge assembly A to the door body and adjacent supporting pilaster, the externally threaded head portion 24' of a cam pin 24 is threaded into the upper threaded socket 14 of the riding sleeve 11 so that the pin extension 24" of the cam pin 24 projects into the uppermost cam slot 23 as shown in FIG. 7. The-lower edge of the uppermost cam slot 23 provides the cam track 23a with which the cam pin extension 24 is in door supporting camming contact. When the door is in closed or residence position as shown in FIG. 2, the cam pin extension 24 seats within the lowermost or residence end 23 of the uppermost cam slot 23, and when the door is swung into open position, the hinge assembly components will assume the position shown in FIGS. 6 and 7 and the cam pin extension 24 will have moved upwardly through the uppermost cam slot 23 until the door body has been swung into fully open position, when the cam pin extension 24" will have reached the upper opened door end 23 of the uppermost cam track 23.

It will be appreciated that only the uppermost cam track 23 and the cam pin 24 as applied to the uppermost socket 14 of the riding sleeve are operative, and that the lowermost cam slot 23 as shown in FIGS. 3 and 4, and the lowermost threaded socket 14 as shown n FIG. 7, remain inoperative. When the wing leaf 15 of the swinging hinge part a is on the left hand side of the hinge pintle 20` as shown in FIG. 3 and attached to a left hang swinging door as shown in FIG. 2, the operative uppermost cam slot 23- spirals upwardly from the rear of the hinge pintle around the left hand side of the hinge pintle. However, when the hinge assembly is inverted end-for-end so that the wing leaf 15 of the swinging cam part a is positioned for application to a right hand swinging door, the previous lowermost cam slot 23 becomes the operative uppermost cam slot, and in that case the operative uppermost cam slot 23 spirals upwardly from the rear of the hinge pintle around the right hand side of the hinge pintle; and the position of the cam pin 24 is accordingly shifted and applied to the companion uppermost threaded socket 14 of the riding sleeve 11. Thus, by a simple shifting of the position of the cam pin 24 from the lower threaded socket 14 to the upper threaded cam socket 14, the assembled hinge is adapted for application to either right hand or left hand swinging doors and associated supporting pilasters. Shifting of the cam pin 24 from one threaded socket 14 to the other can be conveniently accomplished after the hinge has been assembled, but before the assembled hinge is attached to the door body and adjacent supporting pilaster. It will also be noted that the spaced cam slots 23 23 associated with the hinge pintle 20` shown in FIGS. 3 and 4 spiral in opposite directions from the rear side of the hinge pintle for a distance of slightly more than ninety degrees, so that the door body has a swinging movement of approximately ninety degrees as indicated in FIGS. 2 and 6. By increasing the length of the spiraling cam slots 23, the mounted door may have a correspondingly greater swinging movement from residence position to maximum open position.

To reduce friction, the entire hinge pintle 20 may be composed of a tough and wear-resistant plastic cornpound having a low coefcient of surface friction, so that the cam slots 23 formed in the plastic body 21 0f the hinge pintle permits camming movement of the cam pin extension 24" therein with minimum friction. Alternatively, a modified form of hinge pintle 20a may be used as shown in FIGS. 8A and 8B, in which the cylindrical body of the modied hinge pintle 20a is made in the form of a cylindrical body shell 21a formed of a tough and wear-resistant plastic compound having a low coeicient of surface friction, and which is bonded to a polygonal shaped rod 22a formed of strong and rigid metal such as a steel alloy, and whose projecting end portions provide the projecting polygonal heads 22 22 of the modified hinge pintle 20a. In this hinge modication, the complementary cam slots 23-23 are molded in the body forming shell 21a so as to present tough and wear-resistant cam slots 23-23 having a low coefficient of surface friction.

When the door bodies 50 and associated pilasters 40, are made as above described and shown in FIG. 2, no jamb strips are provided against which the door may abut, and some means associated with the hinge assembly should therefore be provided to prevent the door body from swinging from its closed position shown in FIG. 2 in a direction away from the applied hinge assembly. This is accomplished, as shown in FIGS. 1-6, by providing the end portions of the wing leaf 15 which extend beyond the connecting neck 15 thereof, with lip extensions 19 19` which overhang the adjacent corner portion 51 of the door body 50. Each lip extension 19 presents a vertical terminal edge 19 which is designed to abut the adjacent vertical shoulder forming edge 9 of the dat-faced boss 4 projecting rearwardly from the adjacent supporting sleeve 1, when the door body 50 is in fully closed position as shown in FIGS. 2 and 5. The front face of each lip extension 19 has a curvilinear contour as shown in FIGS. 2 and 6 so that the lip extensions 19-19 do not obstruct the swinging movement of 10 the wing leaf when the door is swung from and to closed and open position, as indicated in FIGS. 2 and 6.

The cam operated hinge A is assembled by tilting the barrel-shaped riding sleeve 11 of the swinging hinge part a between the spaced supporting sleeves 1 1 of the supporting hinge part, as indicated by the phantom lines on the right hand side of FIG. 4. The

hinge pintle

20 or 20a is then inserted endwise through the bore 2 of one of the supporting sleeves 1, through the bore 12 of the riding sleeve 11, and'into the bore 2 of the companion supporting sleeve 1. The locking caps 25 are then inserted into outer pockets 3 of the supporting sleeves 1 1, and the shank portions 28 of the assembly screws 28 then inserted through the respective locking caps and threaded into the threaded bores 22 extending through the polygonal head portions 22 and into the

cylindrical body

21 or 21a of the

hinge pintle

20 or 20a. With the

wing leafs

5 and 15 in parallel relation, as shown in FIGS. 2, 3 and 5, the cam pin 24 is inserted into the uppermost threaded socket 14 and its aligned cam pin receiving bore 14 as shown in FIG. 5, and the cam pin extension 24" projected into the residence end 23 of the uppermost cam slot 23. The hinge as thus assembled is ready for application to the door body 50r and adjacent pilaster 40.

The assembled cam operated hinge A is applied in the field to the door body and adjacent pilaster by inserting the spaced studs 8 8 extending from the wing leaf of the supporting hinge part a into the preformed spaced holes in the erected pilaster or doorframe member 40, with the abutment shoulders 4' of the rear bosses 4 of the supporting sleeves 1 1, and the seating rim 6 of vthe wing leaf 5 seating snugly against the adjacent corner portion 41 and side face of the pilaster 40. A backing plate 29 is then applied to the opposite face of the pilaster, as shown in FIG. 2. The backing plate 29 has approximately the same length, width and shape as the wing leaf 5, and presents a spaced pair of tapered screw head receiving holes which are designed to be brought into alignment with the supporting studs 8 8 as applied to the pilaster. The backing plate 29 may present a vertical lip 30 and a at rear face or rim designed to snugly overlap the adjacent corner portion 41 and side face of the pilaster 4i)` as shown in FIG. 2. The threaded shank portion of a clamping screw 31 is inserted into the threaded bore 8 formed in the end of each supporting stud 8, and the clamping screws 31 then tightened until the tapered head portions thereof are securely seated in the tapered holes of the backing plate 29, as shown in FIG. 2. The Wing leaves 5 of similar upper and lower hinge assemblies A are applied to the pilaster as above explained, before the door body is mounted.

The wing leaves 15 of the similar upper and lower hinge assemblies A are applied to the door body 50 by inserting the spaced studs 18-18 projecting from the rear face of each wing leaf 15 into preformed holes provided in the door body 50, with the seating shoulder 13' presented by rear boss 13 of the riding sleeve 11, and the rear seating rim 16 presented by the Wing leaf 15 of each hinge assembly A, snugly seated against the adjacent corner portion 51 and side face of the door body. A backing plate 32 is then applied to the opposite face of the door body. The backing plate 32 has approximately the same length, width and shape as the associated wing leaf 15, and presents a spaced pair of tapered screw-head receiving holes which are designed to be brought into alignment with the spaced supporting studs 18 18 as applied 'to the door body. Each backing plate 32 may present a vertical lip 33 and flat rear face designed to snugly overlap the adjacent corner portion 51 and side face of the door body 50, as shown in FIG. 2. The threaded shank portion of a clamping screw 34 is inserted into the threaded bore 118 formed in the ends of each supporting stud 18 and the clamping screws`34 then tightened until the tapered head portion thereof is securely seated in the tapered holes of the back- 1 1 ing plate 32, as shown in FIG. 2. Application of the wing leaves 15 of similar upper and lower hinge assemblies A to the door body S swingably mounts the door 50 on the supporting pilaster 40.

When the upper and lower hinge assemblies A have been mounted on a swinging door and associated pilaster and the door body is swung into the closed position, the lower residence end 23 of the uppermost cam track 23 as indicated in FIG. 3 Will then align with the uppermost socket 14 in the rear face of the riding sleeve 11 as indicated in FIG. 5, thereby permitting insertion of the cam pin 24 in the uppermost socket 14. The threaded head portion 24 of the cam pin 24 is turned into the uppermost threaded socket 14 until its cam pin extension 24" projects through the socket bore 14 and into the lower residence end 23 of the upermost cam track 23. When the hinge assembly is mounted on a left hand swinging door, the uppermost cam slot 23 spirals upwardly across the left hand side of the

cam pin

20 or 20a as indicated in FIG. 3, and as further indicated by the slot 23 shown in the development diagram of FIG. 10 and extending upwardly to the left of the vertical line marked 0 on the diagram. When the left hand swinging door is thus mounted, the front face 17 of the Wing leaf 15 of the door-attaching swinging hinge part a swings toward the front face of the wing leaf of the pilaster-attached hinge part a, and the cam pin 24 moves upwardly through the uppermost cam slot as the door is to be forcibly swung toward open position. When the mounted door body is forcibly swung approximately ninety degrees to full open position, the pin extension 24" of the cam pin 24 reaches the upper opened door end 23 of this cam slot, thereby raising the door a distance of approximately one-fourth inch. When the opened door is released, the gravity weight of the door automatically returns the left hand swinging door to closed or residence position, with the cam pin extension 24 again pocketed at the lower residence end 23 of the uppermost cam slot 23.

When the hinge assembly A has been mounted on a right hand swinging door, the hinge assembly as shown in FIGS. 3 and 5 is inverted end-for-end, which places the door body attached wing leaf 15 on the right hand side of the

hinge pintle

20 or 20a, and which also places the cam track 23, which spirals upwardly around the right hand side of the

hinge pintle

20 or 20a, in the uppermost position, as is evident by inverting the diagram shown in FIG. 10. The cam pin 24 is then shifted and applied to the uppermost socket 14 of the riding sleeve 11, and its cam pin extension 24" projected into the uppermost cam track 23, which spiral around the right hand side of the

hinge pintle

20 or 20a.

If desired, the lowermost idle socket 14 may be covered, plugged and concealed by a suitable threaded plug so that dust and foreign matter cannot enter the cam tracks 23 contained within the riding sleeve 11.

It is thus seen that the symmetrical hinge assembly A made as above described is adapted for application to either left hand or right hand swinging doors and associated doorframe members, by inverting the assembled hinge as the condition requires, and shifting the cam pin 24 to the uppermost socket 14 for camming contact with the uppermost cam slot 23, without the addition or substitution of any component.

The modiiied form of cam operated hinge assembly B as illustrated in FIGS. 1l-20, includes a supporting hinge part b presenting a pair of spaced supporting sleeves 1b-1b joined by a doorframe attaching section 5b extending laterally therefrom; a swinging hinge part b' which presents a tubular riding sleeve 11b designed to be axially aligned between the spaced supporting sleeves 1b-1b and having a door-attaching section 15b extending laterally therefrom; and a hinge pintle 20b telescoped through the tubular riding sleeve 11b and whose end portions are designed to be secured to the spaced supporting sleeves IIJ- 1b. The hinge assembly B may be adapted for convenient application to both right and left hand swinging. door bodies and associated pilasters by making the supporting hinge part b, the swinging hinge part b', the hinge pintle 20b and other components of the assembled hinge, symmetrical in form and shape about a medial plane x-x extending at right angles to the longitudinal axis of the assembled hinge, as indicated in FIG. ll.

The spaced supporting sleeves 1b--1b of the symmetrical supporting hinge part b are generally tubular in form and preferably similar in size and shape, as indicated in FIGS. 1l, 12, 14, 15 and 20. Each symmetrical supporting sleeve 1b presents an axial bore 2b through which the hinge pintle 20b may be telescoped, and which terminates in an outer tapered socket 3b within which the tapered head portion of an assembly screw 28 may be pocketed.

The spaced supporting sleeves lb--lb of the supporting hinge part b are rigidly joined by an attaching section 5b which is designed for rigid securement to an adjacent doorframe member or pilaster, such as the pilaster 40 i1- lustrated in FIG. ll, and previously described. The attaching section 5b may be advantageously shaped in the form of a wing leaf integrally joined as by sturdy connecting necks 5b-5b' to the spaced supporting sleeves 1b-1b as shown in FIGS. ll-l5, 19 and 20. Each of the supporting sleeves 1b has a flat faced rear boss 4b which presents a shoulder forming edge 4b', as shown in FIG. 12, designed to snugly abut the adjacent corner portion 41 of the doorframe member 41; and the wing leaf 5b presents a gear seating rim 6b designed to snugly seat against the adjacent side face of the doorframe member 40. The wing leaf 5b also presents a front face 7b which may be generally parallel to the rear seating rim 6b, and which merges smoothly into the outer surfaces of the supporting sleeves lb-Ib.

A pair of spaced supporting studs 8 8, formed integral with and projecting at right angles from the rear face of the wing leaf 6b, as shown in FIGS. 12, 13, 19 and 20, are designed for insertion into corresponding spaced holes drilled into the doorframe member 40 as indicated in FIG. 2. The wing leaf 5b is preferably symmetrical about its medial axis x-x, as shown in FIG. 1l, and the spaced studs 8--8 extending from the rear face of the wing leaf 5b, are preferably spaced equal distances from the terminal upper and lower ends of the wing leaf 5b so that the wing leaf can be inverted endfor-end and its studs 8-8 inserted into the equally spaced holes drilled into the pilaster when positioned on either the right hand side or the left hand side of the swinging door body 50.

The axially elongated riding sleeve 11b of the symmetrically swinging hinge part b is generally tubular in form and symmetrically shaped about the medial axis x-x, as indicated in FIG. ll. The axially elongated tubular riding sleeve 11b presents a cylindrical inner wall 12b which provides a vibration free journal for a spaced pair of cylindrical cam members 3535 which are fixed to the hinge pintle 20b during assembly of the hinge B. The tubular riding sleeve 11b of the swinging hinge part b' is rigidly joined to an attaching section 15b which is designed for rigid securement to the adjacent door body 50. The attaching section 15b may 'be advantageously shaped in the form of a wing leaf, integrally joined as by a sturdy connecting neck 15b to the riding sleeve 11b as shown in FIGS. 1l-15 and 19. The rear face of the elongated riding sleeve 11b of the hinge assembly B, as applied to the closed door body and adjacent pilaster, is provided with a at faced intermediate boss 13b as shown in FIGS. 12, 13 and 19 which is symmetrical with respect to the medial transverse axis x-x of FIG. 11 and the transverse line 13-13 of FIG. 12. A vertical edge of the boss 13 forms a rear seating shoulder 13b designed to snugly abut the adjacent corner portion 51 of the door body 50. The rear face of the Wing leaf 15b presents a rear seating rim 16b designed to snugly seat against the adjacent side face of the door body 50. The front face 17b of the wing leaf 15b may be generally parallel to its rear face and merges smoothly into the outer surface of the riding sleeve 11b.

A pair of spaced supporting studs 18-18, formed in-` tegral with and projecting at right angles from the rear face of the wing leaf 15b, are designed for insertion into correspondingly spaced holes drilled in the door body 50 as indicated in FIG. 2. The wing leaf 15b is preferably symmetrical about its medial axis x-x, and the spaced studs 18-18 extending from the rear face of the Wing leaf 15b are preferably symmetrically shaped equal distances from the terminal upper and lower ends of the wing leaf, so that the wing lead 15b can be inverted end-for-end and the studs 18-18 inserted into equally spaced holes drilled into the door body 50 when positioned on either the left hand side or right hand side' of the supporting pilaster 40. To achieve a harmonious design pattern, the door body attaching wing leaf 15b is preferably similar in length, width, shape and form to the pilaster-attached wing leaf b, and the associated riding sleeve 11b preferably has an exterior contour in harmony with the supporting sleeve 1b-1b of the supporting hinge part a of the hinge assembly B.

The cylindrical hinge pintle 20b, of sturdy construction, presents internally threaded bores 20b extending axially into the end portions thereof, as indicated in FIGS. 14 and 15. The sturdy hinge pintle 20b, preferably formed from a tough, strong and corrosion resistant metal, is endwise telescoped through the axial bore 2b of one of the supporting sleeves 1b, through the tubular riding sleeve 11b of the swinging hinge part b', and into the axial bore 2b of the companion supporting sleeve 1b of the fixed hinge part b. The hinge pintle 20b is adjustably secured to the spaced supporting sleeves by a pair of assembly screws 28-28, each of which presents a shank portion 28 threadably inserted into the threaded bore 20b extending axially into the adjacent end portion of the hinge pintle 20b, and a tapered head portion 28 which is pocketed within the tapered outer socket 3b' formed in the adjacent supporting sleeve 1b of the fixed hinge part b.

The cylindrical hinge pintle 20b also extends through the axial bores 35 of a spaced pair of cylindrical cam members 35-35 of similar form and shape and symmetrically positioned on the opposite sides of the medial axis x-x of the hinge assembly. Each of the spaced Cylindrical cam members 35-35 is suitably secured to the hinge pintle 20b during assembly of the hinge by suitable means such as a set screw or cotter pin 27 as shown in FIG. 14, and each cam member 35 presents a at outer end 35" positioned directly adjacent the inner face of the adjacent supporting sleeves 1b. The inner end of each cylindrical cam member presents a pair of similar cam tracks 36-36 as shown in FIGS. 14 and 15, each track being approximately 180 degrees in radial length, with the adjacent ends of the paired cam tracks 36-36 joined by a valley portion 36 and a crown portion 36"., The cylindrical cam members 35-35 project into the; ends of the tubular riding sleeve 11b and provide a smoothly operating and vibration-free journal for the riding sleeve 11b during angular rotation thereof. The paired cam tracks 36-36 of the spaced pair of cylindrical cam members 35-35 are substantially fully contained and concealed within the riding sleeve 11b at all times, as indicated in FIGS. 11, 12 14 and 20.

A tubular riding cam 38 has a smooth axial bore 38' through which the hinge pintle 20b is telescoped. The riding cam 38 is positioned between the pintle attached and journal forming cylindrical cam members 35-35, and is adjustably positioned within the cylindrical bore 12b of the riding sleeve 11b. The tubular riding cam 38 presents a pair of similar cam tracks 39-39 at each end thereof which are positioned between and complementary to the paired cam tracks 36-36 presented by the spaced inner ends of the pintle-attached cam members 35-35,

14 as shown in FIGS. 14 and 15. Each of the paired cam tracks 39-39 at each end of the riding cam 38 is approximately degrees in radial length, with the adjacent ends of the paired cam tracks 39-39 joined by a valley portion 39' and a crown portion 39".

The tubular riding cam 38 is adjustably secured to and within the tubular riding sleeve 11b so as to angularly rotate with the riding sleeve and yet permit axial adjustment of the riding cam 38 so that one of its cam tracks 39 can be axially moved into riding engagement with one of the paired cam tracks 36 of the pintle-attached cam member 35 therebelow. To this end, the exterior cylindrical surface of the riding cam 38 is provided with a vertical guide rib 38 as shown in FIGS'. 16, 17 and 18 designed to slide within a corresponding vertical guide groove 12b formed in the cylindrical inner wall 12b of the tubular riding sleeve 11b, and whereby the riding cam 38 can be axially adjusted to place one of its paired lowermost cam tracks 39 in camming engagement with one of the paired cam tracks 36 of the pintle-attached cam member 35 therebelow.

The medial center of the rear boss portion 13b of the riding sleeve 11b presents a threaded socket 14b which continues as a bore extension through the tubular wall of the riding sleeve, andis designed to take a set screw 14b, as shown in FIGS. 12 and 13. The end portion of the set screw 14b is applied to project into the uppermost one of a -vertically spaced pair of set screw receiving holes 38-38" formed in the tubular wall of the riding cam 38 as shown in FIGS. 16 and 17. The set screw 14b thus maintains the riding cam in fixed position with one of its lowermost cam tracks 39 in riding engagement with one of the cam tracks 39 of the pintle-attached cam member 35 therebelow.

The tubular riding cam 38 is preferably formed from a tough and Wear-resistant plastic compound having a low coeflicient of surface friction, so that each of its carn tracks 39 will selectively ride with minimum friction over the complementary cam track 36 of the pintle-attached cam member 35 therebelow. Additionally, when the riding sleeve 38 is formed of such a plastic compound, its axial bore 38 provides a smoothly operating journal for the hinge pintle 20b which extends therethrough, so that the riding sleeve will angularly rotate on the cylindrical hinge pintle 20b substantially without friction. The spaced pintle-attached cam members 35-35 can also be advantageously formed of a tough and wear-resistant plastic compound having a low coeflicient of surface friction, so that the cylindrical outer surfaces of the spaced cam members 35-35 provide a smooth and substantially frictionless journal for the tubular riding sleeve 11b which angularly rotates thereon.

When the assembly screws 28-28 are loosened, the hinge pintle 20b and the journal forming cam members 35-35 attached thereto, can be rotated as a unit, so that the valley portion 36 of the operating cam track 36 of the lowermost cam member 35 is oriented into radial alignment with the desired residence position of the mounted door. The lower assembly screw 28 can then be tightened to thereby draw the serrated at end face 35" of the lowermost cam member 35 into frictional or gripping engagement with the adjacent inner end face of the adjacent supporting sleeve 1b of the pilaster attached hinge part b. When the upper assembly screw 28 is also tightened, the lowermost cam member 35 will maintain its adjustably oriented position during continued use.

When the door bodies 50 and associated pilasters 40 are made as above described and shown in FIGS. 2 and ll, no jamb strips are provided against which the door body may abut, and some means associated with the hinge assembly B should therefore be provided to prevent the door body from swinging from its closed position indicated in FIGS. 2 and 13 in a direction away from the applied hinge assembly. This is accomplished, as shown 15 in FIGS. 1l, l2, 13, 15, 19 and 20, by providing an abutment lip 9b which projects laterally from the intermediate portion of the wing leaf 5b and between the Supporting sleeves lb--lb of the stationary hinge part b. The laterally projecting lip 9b presents a vertical abutment edge 9b designed to abut against the Vertical abutment edge 19, presented by the rear boss portion 13b of the riding sleeve 11b of the swinging hinge part b', when the swinging leaf 15b has been swung substantially into parallelism with the stationary hinge leaf 5b, as indicated in FIG. 13. The stationary abutment lip 9b of the xed hinge part b, and the rear boss portion 13b of the swinging hinge part b', do not interfere with the operation of the hinge assembly B nor the opening swinging movement of the door body.

The separate components of the hinge B, shown in exploded relation in FIG. 15, may be quickly and easily assembled into an operative hinge unit, by the following procedure: The vertical guide rib 38 of the axially shiftable riding cam 38 is aligned with the vertical guide groove 12b' formed in the axial bore 12b of the riding sleeve 11b, and the riding cam 38 then telescoped into the riding sleeve; the cylindrical cam members 35-35 are telescoped into the ends of the tubular riding sleeve 11b; the hinge pintle 20b is successively telescoped through the bore 2b of one of the supporting sleeves 1b, through the axial bore 35 of the first cam member 35, through the axxial bore 38 of the riding cam 38, through the axial bore 3S of the companion cam member 35, and into the axial bore 2b of the companion supporting sleeve 1b; and the threaded shank portions 28' of the end assembly screws 28 are inserted into the supporting sleeves 1b-1b and threaded into the end bores 20b of the hinge pintle 20b.

By axially shifting the riding sleeve 11b on the cylindrical cam members 35-35, a substantial part of one of the cam members 35 can be exposed to permit securement of that cam member to the hinge pintle 20b, as by the cotter pin 27; and by an opposite axial shift of the riding sleeve 11b, the companion cam member 35 is substantially exposed to permit its securement, as by companion Cotter pin 27, to the hinge pintle 20b.

The set screw 14b' is then inserted into the threaded socket 14b presented by the rear boss portion 13b of the riding sleeve 11b, and its end portion projected into the uppermost set screw receiving hole 38 presented by the tubular riding cam-38; thereby placing one of the lowermost cam tracks 39 of the riding cam 38 in riding contact with one of the complementary cam tracks 36 of the pintle-attached cam member therebelow. It will be noted that the vertically aligned set screw receiving holes 38"- 38" in the Wall of the riding cam 38, are maintained in vertical alignment with the threaded socket 14b of the riding sleeve 11b, by reason of the guidance provided by the vertical guide rib 38 of the riding cam which slides in the vertical guide groove 12b' of the riding sleeve.

By axially jarring the hinge assembly, the riding cam 38 will normally shift downwardly to the point where one of its lowermost cam tracks 38 has shifted into riding contact with one of the complementary cam tracks 36 of the pintle attached cam member therebelow; and whereupon its uppermost set screw receiving hole 38"' will be in alignment with the set screw receiving socket 14, The riding cam 38 can also be axially shifted by pushing it into operative position by means of a small diameter wire or rod inserted into the open end of thevaxial guide groove 12b. Before the hinge assembly is permanently applied to the pilaster and door body, a lubricant may be injected into the tubular riding sleeve 11b through the open ends of the axial guide groove 12b', and the open ends of the groove 12b then sealed or plugged. It is thus evident that the uppermost set screw receiving hole 38" may be easily brought into alignment with the set screw receiving socket 1412, and the inner end of the set screw 1411 readily inserted into the uppermost set screw receiving hole 38 of the riding cam 38 as contained within the riding sleeve 11b. When these adjustments are made, which selectively adapt the hinge for association with predetermined right hand or left hand swinging doors, the hinge assembly is prepared for application in the eld to the supporting pilaster and door body.

The assembled cam operated hinge B is applied in the field to the erected pilaster and door body, by inserting the spaced studs 8 8 extending from the wing leaf 5b of the supporting hinge part b into the preformed spaced holes in the erected pilaster or doorframe member 40 aS indicated in FIG. 2. The vertical shoulders 4b presented by the rear boss potrions 4b-4b of the supporting sleeves IIJ-1b, and the vertical shoulder 4b aligned therewith and presented by the abutment lip 9b extending from the wing leaf 5b, can then be snugly seated against the adjacent corner portion 41 of the pilaster 40, and with the rear seating rim 6b of the wing leaf 5b seated against the adjacent side face of the pilaster. A backing plate 29 may then be applied to the opposite face of the pilaster 40, and secured to the spaced studs 8-8 by the clamp screws 31, in the same manner as heretofore described and illustrated in FIG. 2. The wing leaves 5b of similar upper and lower hinge assemblies B are applied to the pilaster as above explained, before the door body is mounted,

The wing leaves 15b of the similar upper and lower hinge assemblies B are applied to the door body 50 by inserting the spaced studs 18-18 projecting from the rear face of each Wing leaf into the preformed holes provided in the door body 50. The vertical seating shoulder 13b presented by the rear boss portion 13b of the riding sleeve 11b, can then be snugly seated against the adjacent corner portion 51' of the door body 50, with the rear seating rim 16b of the wing leaf 15b seated against the adjacent side face of the door body. A backing plate 32 can then be applied to the opposite face of the door body and secured by clamping screws 34 to the spaced studs 18-18, in the same manner as heretofore described and shown in FIG. 2. Application of the wing leaves 15b of similar upper and lower hinge assemblies B to the door body 50, swingably mounts `the door 50 on the supporting pilaster 40.

When the upper and lower hinge assemblies B have been mounted on the swinging door and associated supporting pilaster, the door body is swung into the desired residence position. To maintain this residence position, the assembly screws 28-28 are loosened; the hinge pintle 20b and cylindrical cam members 35-35 attached thereto are rotated as a unit so as to place the valley portion 36' and crown portion 36 of the paired cam tracks 36 of the lowermost cam member 35 in radial alignment with the desired residence position of the door body; the lowermost assembly screw 28 is then tightened so that the serrated end face 35" of the lowermost cam member 35 grips the adjacent supporting sleeve 1b and which thereby establishes the residence position of the door body. This residence adjustment can be easily made at any time after installation in the field.

Referring now to FIGS. 21-28, a further modified form of cam operated hinge assembly C is shown as constructed in accordance with the invention. The hinge assembly C includes a supporting hinge part c presenting a pair of space supporting sleeves 1c-1c joined by a doorframe attaching section 5c extending laterally therefrom. A swinging hinge part c presents a tubular riding sleeve 11c designed to be axially aligned between the spaced supporting sleeves 1c-1c and having a door attaching section 15C extending laterally therefrom. A hinge pintle 20c (FIG. 23) passes through the tubular riding sleeve 11C and is provided with end portions designed to be secured to the space supporting sleeves 1c-1c. As in the other forms of the invention, the hinge assembly C may be adapted for convenient application to both right and left hand swinging door bodies and associated pilasters by making the supporting hinge part c and the swinging hinge part c symmetrical in form and shape about a median plane extending at right angles to the longitudinal axis of the assembled hinge as indicated hereinbefore. However, the hinge assembly C differs from the other two in that the component hinge parts, described more in detail hereinafter, are not symmetrical about a median plane although they are nevertheless designed for dual use whether the hinge parts c and c are installed on right or left hand swinging doors.

In accordance with this form of the invention, a riding cam sleeve 50 is telescoped within the tubular riding sleeve 11C and secured against relative rotation therein by means of a longitudinally extending key 52 (FIG. 23) received in a longitudinal -keyway formed in the cylindrical bore 53 of the tubular riding sleeve 11C. A radial ange 54 on one end of the riding cam sleeve 50 abuts against the bottom of the tubular riding sleeve 11e upon full insertion of the riding cam sleeve as shown. The riding cam sleeve 50 has cylindrical bores 55, 57 at opposite ends, the bore 55 terminating in an annular cam track 60 having a peak 60 separated from a valley 60 by 180 spirally formed cam track portions s, t each having a rounded camming surface 62 (FIGS. 24, 25). T he bores 55, 57 are connected by a bore 65 of reduced diameter which is adapted to closely encircle the hinge pintle c.

A cylindrical cam member 70 is received within the bore 55 of the riding cam sleeve and has on one end an annular cam track 72 formed with a peak 72 and valley 72" separated by 180 spirally formed camming surfaces s', t' adapted to mate in complementary fashion with the surfaces s, t and peak 60 and valley 60 of the interior annular cam track 60. A cylindrical bore 75 within the cylindrical cam member 70 is aligned with the bore 65 of the riding cam sleeve 50 in the assembled condition so as to receive and provide a journal for the lower end of the hinge pintle 20c (FIG. 23).

The bore 57 in the riding cam sleeve 50 which opens in the opposite direction to the bore 55 is sized so as to receive a portion of and journal a cap 80 secured to the upper end of the hinge pintle 20c leaving a space 82 between the bottom of the bore 55 and the bottom of the cap 80 to allow for the reciprocating motion of the tubular riding sleeve 11C.

The cylindrical cam member '70 and cap 80 are adapted to seat upon and be fastened to the axially spaced bosses 1c-1c of the supporting hinge part c. Thus, the hinge pintle 20c is secured between the axially spaced bosses 1c-1c while the tubular riding sleeve 11a` and riding cam sleeve 50 are free to rotate as well as reciprocate thereon. By loosening the fasteners and repositioning the cylindrical cam member 70 the alignment of the peaks and valleys 60', 60", 72', 72 of the annular cam tracks 62, 72 may be changed to effect any residence position desired for the door such as partially open, as shown by the phantom line position in FIG. 22.

In order to assemble the component hinge parts (FIG 27), the riding cam sleeve 50 is inserted upwardly into the tubular riding sleeve 11C until the radial flange 54 abuts to prevent further axial movement. The hinge pintle 20c and cap 80, which are secured against relative movement, are then assembled by insertion from the top through the tubular riding sleeve 11e` passing through the bore 65 of the riding cam sleeve 50` and into the bore 75 of the cylindrical cam member 70. The tubular riding sleeve 11C of the supported hinge part c is then aligned with the axially spaced bosses 1c-1c of the supporting hinge part c, and the cylindrical cam member 70 angularly positioned to establish the residence position of the door. Finally the cap 80, hinge pintle 20c, and cylindrical cam member 70 are secured by the fasteners. The riding cam sleeve 50 is secured against rotation within the tubular riding sleeve 11C by the key 52. Thus, in swinging the door in either direction from its residence position, it will be raised by the camming action of the annular cam tracks 60, 72 and upon release, will be returned automatically to its residence position simply by the force of gravity acting upon it.

As shown in FIGS. 21-23, and 27, the hinge assembly C is adapted for installation on a right hand swinging door, it being understood of course, that although only one hinge assembly is shown, normally two and possibly rnore would be installed to properly support the door for its swinging motion. If it is desirable that the door swing on hinges mounted on the left side (FIG. 28) the supporting hinge part c and supported hinge part c are merely inverted end-for-end since they are symmetrical with respect to a horizontal median plane and the riding cam sleeve 50, cylindrical cam member 70, hinge pintle 20c and cap 80 are installed maintaining the same positional relationship as shown in FIG. 27, the difference being merely that the riding cam sleeve 50 and hinge pintle 20c are inserted in opposite ends of the now inverted tubular riding sleeve 11e.

Door bodies to which the hinge assemblies B and C have been applied, are adapted to have an angular swinglng movement of substantially by reason of the fact that the stationary cam tracks 36 and 72 and riding cam tracks 39, 60 are approximately 180 in radial length. The angular swing of the door body may be reduced below a maximum 180 swing, by forming a rest notch in the operative cam track.

It is thus seen that the cam operated hinge assemblies A, B and C of this invention are adapted for application to either left hand or right hand swinging doors and pilasters, without the addition or substitution of any component. When constructed in accordance with this invention, the hinge assemblies insure substantially smooth and frictionless swinging movement of the door body to and from residence position. This is assured in hinge assembly A by making the

body section

21 or 21a of its

hinge pintle

20 or 20a and the riding cam 38 and pintle-attached cylindrical cam members 35-35 of hinge assembly B, of a tough and wear-resistant plastic compound having a low coefficient of surface friction. As a result, the elongated tubular riding sleeve 11 of hinge assembly A 1s 'smoothly journalled on the substantially frictionless

cylindrical body

21 or 21a of the

hinge pintle

20 or 20a, and its cam pin 24 rides in camming engagement with the substantially frictionless cam track 23a of the uppermost cam slot 23. In the hinge assembly B, the elongated tubular riding sleeve 11b is rotatably journalled on the substantially frictionless cylindrical cam members 35-35, and is further rotatably journalled on the cam pin 20b through its substantially frictionless riding sleeve 38 which rotates as a unit with the riding sleeve 11b and through which hinge pintle 20b extends. In the hinge assembly B, smooth and substantially frictionless swinging movement of the door body is further assured by reason of the substantially frictionless movement of the cam track 39 of the riding cam as it rides on the substantially frictionless complementary cam track 36 of the pintle-attached cam member 35 therebelow. Likewise, the hinge assembly C may be made with the riding cam sleeve 50, cylindrical cam member 70 and cap '80 of a tough, wear resistant plastic to assure substantially frictionless movement. Moreover, the mating cam surface 62 is rounded to establish more or less line contact.

While certain novel features of this invention have been disclosed herein and are pointed out in the claims, it will be understood that various omissions, substitutions, and changes may be made by those skilled in the art without departing from the spirit of this invention.

What is claimed is:

1. A cam operated hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members which includes, an invertible lirst hinge part presenting a spaced pair of symmetrical supporting bosses having common symmetrical attaching means formed integrally therewith and extending laterally therefrom designed for attachment to either a left or a right hand doorframe member, an invertible second hinge part presenting a symmetrical riding sleeve designed to reciprocate between said spaced supporting bosses and having symmetrical attaching means formed integrally therewith and extending laterally therefrom designed for attachment to either a right or left hand swinging door body, a hinge pintle extending through an axial bore in said riding sleeve, means for supporting the ends of said hinge pintle from said spaced supporting bosses, a cam track means in fixed position with respect to said hinge pintle and substantially contained within the axial bore of said riding sleeve, and a riding cam means rotatable with said riding sleeve for camming contact with said fixed cam track means, said riding cam means being formed separate from both said riding sleeve and riding sleeve attaching means.

2. A cam operated hinge according to claim 1 wherein said cam track means comprises a cylindrical cam element presenting a camming surface on one end,

said riding cam means comprising a riding sleeve having a cylindrical bore adapted to receive and journal upon said cylindrical cam element, and

a camming surface within said cylindrical bore engageable in complementary fashion with the camming surface on said cylindrical cam element for reciprocating said riding sleeve and door body on the hinge pintle.

3. A cam operated hinge according to claim 2 wherein said riding cam sleeve has an axial bore through which the hinge pintle passes and said cylindrical cam element has an axial bore for receiving the end of said hinge pintle.

4. A cam operated hinge assembly according to claim 3 wherein said hinge pintle has an enlarged diameter cylindrical portion at one end, and

said riding cam sleeve has a cylindrical bore adapted to substantially contain the cylindrical portion of said hinge pintle and journal said riding sleeve thereon while permitting reciprocating motion thereof.

5. A cam operated hinge assembly according to claim 4 wherein said riding cam sleeve has a longitudinally extending key on the outer surface thereof adapted to be received in a longitudinally extending keyway within the axial bore of said riding sleeve to prevent relative rotation between said riding cam sleeve and riding sleeve during the operation of said door.

6. A cam operated hinge assembly according to claim 5 wherein said longitudinally extending key and keyway extend throughout the length of both said riding cam sleeve and riding sleeve whereby the riding cam sleeve may be inserted in either open end of said riding sleeve.

7. An invertible cam operated hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members which includes, a first hinge part presenting a spaced pair of symmetrical supporting sleeves having symmetrical means extending laterally therefrom designed for attachment to either a left or a right hand doorframe member, a second hinge part presenting a symmetrical riding sleeve designed to reciprocate between said spaced supporting sleeves and having symmetrical means extending laterally therefrom designed for attachment to either a right or left hand swinging door body, a symmetrical hinge pintle extending through an axial bore in said riding sleeve, means for adjustably securing the ends of said hinge pintle to said spaced supporting sleeves, stationary cam means presenting a spaced pair of symmetrical cam tracks substantially contained within the axial bore of said riding sleeve, and a riding cam element designed to be shiftably secured to said riding sleeve for selective camming contact with either one of the cam tracks of said stationary cam means.

8. An invertible hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members which. include. 'el ISt hinge part presenting a spaced pair of symmetrical supporting sleeves, and a symmetrical wing leaf integral with and extending laterally from said spaced supporting sleeves and designed for attachment to either a left or a right hand doorframe member; a second hinge part presenting a symmetrical riding sleeve designed to reciprocate between said spaced supporting sleeves, and a symmetrical wing leaf integral with and extending laterally from said riding sleeve and designed for attachment to either a right or left hand swinging door body; a symmetrical hinge pintle extending through an axial bore in said riding sleeve, means for securing the ends of said hinge pintle to said spaced supporting sleeves, cam means presenting a spaced pair of symmetrical cam tracks in fixed relation to said hinge pintle and substantially contained within the axial bore of said riding sleeve, and a riding cam element designed to be shiftably secured to said riding sleeve for selective camming contact with either one of the cam tracks of said stationary cam means.

9. An invertible hinge assembly designed for selective application to right and left door bodies and associated doorframe members which includes; a first hinge part having a spaced pair of symmetrical supporting sleeves presenting axially aligned hinge pintle receiving bores, and symmetrical means integral with and extending laterally from said spaced supporting sleeves designed for attachment to either a left or a right hand doorframe member; a second hinge part having a symmetrical riding sleeve designed to reciprocate between said spaced supporting sleeves and presenting a hinge pintle receiving bore extending axially therethrough, and symmetrical means integral with and extending laterally from said riding sleeve and designed for attachment to either a right or left hand swinging door body; a symmetrical hinge pintle extending through the axial bore in said riding sleeve and presenting end portions pocketed within the bores of said supporting sleeves, means for adjustably securing the end portions of said hinge pintle in the bores of said spaced supporting sleeves, stationary cam means presenting a spaced pair of symmetrical cam tracks in fixed relation to said hinge pintle and substantially contained within the axial bore of said riding sleeve, and a riding cam element designed lto be shiftably secured to said riding sleeve for selective camming contact with either one of the cam tracks of said stationary cam means.

10. An invertible hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members which includes; a rst hinge part having a spaced pair of symmetrical supporting sleeves presenting axially aligned hinge pintle receiving bores, and symmetrical means integral with and extending laterally from said spaced supporting sleeves designed for attachment to either a left or a right hand doorright o'r left hand swinging door body; a symmetrical riding sleeve designed to reciprocate between said spaced supporting sleeves and presenting a hinge pintle receiving bore extending axially therethrough, and symmetrical means integral with and extending laterally from said riding sleeve and designed for attachment to either a right or left hand swinging door body; a symmetrical hinge pintle extending through the axial bore in said riding sleeve and presenting end portions pocketed within the bores of said supporting sleeves, means exteriorly accessible at the outer ends of said supporting sleeves for adjustably securing the end portions of said hinge pintle in the bores of said spaced supporting sleeves, stationary cam means presenting a spaced pair of symmetrical cam tracks substantially contained within the axial bore of said riding sleeve, and a riding cam element designed to be shiftably secured to said riding sleeve for selective camming contact with either one of the cam tracks of said stationary cam means.

11. An invertible hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members which includes, a first hinge part presenting a spaced pair of symmetrical supporting sleeves having symmetrical means extending laterally therefrom designed for attachment to either a left or a right hand doorframe member, a second hinge part presenting a symmetrical riding sleeve designed to reciprocate between said spaced supporting sleeves and having symmetrical means extending laterally therefrom designed for attachment to either a right or left hand swinging door body, a hinge pintle extending through an axial bore in said riding sleeve, means for adjustably securing the ends of said hinge pintle to said spaced supporting sleeves, a spaced pair of complementary cam slots formed in the cylindrical body of said hinge pintle and normally concealed within the axial bore of said riding sleeve, and a riding cam element designed to be shiftably secured to said riding sleeve for selective carnrning contact with either one of said cam slots.

12. An invertible hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members which includes, a first hinge part presenting a spaced pair of symmetrical supporting sleeves having symmetrical means extending laterally therefrom designed for attachment to either a left or a right hand doorframe member, a second hinge part presenting a symmetrical riding sleeve designed to reciprocate between said spaced supporting sleeves and having symmetrical means extending laterally therefrom designed for attachment to either a right or left hand swinging door body, a hinge pintle extending through an axial bore in said riding sleeve, means for lfixedly securing the ends of said hinge pintle to said spaced supporting sleeve, a pair of spaced complementary cam tracks associated with said hinge pintle and normally contained within the axial bore of said riding sleeve, and a riding cam element designed to be shiftably secured to said riding sleeve for selective camming contact with either one of said cam tracks, said spaced supporting sleeves presenting inner pockets into which the end portions of said riding sleeve are designed to selectively telescope when said riding sleeve is reciprocated by the swinging movement of the door body.

13. A hinge member including integral one-piece sleeve means and attaching means extending laterally from said sleeve means, said sleeve means having spaced-apart end portions and a substantially cylindrical bore therethrough, said bore having a longitudinal axis and a substantially cylindrical wall surface, cam means removably positioned in said bore intermediate said end portions, said cam means extending from said wall surface toward said longitudinal axis, said cam means being formed separate from sail one-piece sleeve means and attaching means and being removably fixed in said bore against axial and rotational movement relative to said bore.

14. The device of claim 13 and further including a hinge part having a pair of spaced-apart bosses, said bosses having a common longitudinal axis, attaching means extending laterally from said bosses and formed integral therewith, said bosses having inner end surface portions facing one another, said inner end surface portions being spaced-apart a distance greater than the distance between said end portions of said sleeve means, said sleeve means being positioned between said bosses with said longitudinal axis of said bore substantially coincidental with said longitudinal axis of said bosses, cam track means attached to at least one of said bosses against axial and rotational movement relative to said bosses, said cam track means being received in said bore and being in engagement with said cam means, said cam means and said cam track means cooperating with one another to provide relative axial movement between said sleeve and said bosses upon relative rotational movement between said hinge member and said hinge part. l

15. The device of claim 14 wherein said sleeve means has at least one threaded hole therethrough extending radially of said 'longitudinal axis of said bore, and said 22. cam means comprises cam pin means removably threaded into said bore.

-16. The device of claim 14 wherein said wall surface of said bore in said sleeve means has a longitudinal slot formed therein, said cam means comprising a substantially radially extending projection on its exterior surface, said projection being received in said slot.

17. The device of claim 16 wherein said cam means has a cam bore axially therethrough and further including pintle means extending through said cam bore, said pintle means being separate from both said cam means and said cam track means and being connected with each of said bosses.

18. A hinge member including sleeve means and attaching means extending laterally from said sleeve means extending from said sleeve means having a substantially cylindrical bore therethrough, said bore having a longitudinal axis and a substantially cylindrical wall surface, cam means positioned in said bore, said cam means extending from said wall surface toward said longitudinal axis, said cam means being releasably fixed in said bore against axial and rotational movement relative to said bore, said sleeve means having first and second end portions at opposite ends of said bore and said cam means being selectively positionable in two selected positions, one of said selected positions being closer to said first end portion than to said second end portion, and the other of said selected positions being closer to said second end portion than to said first end portion.

19. The device of claim 18 and further including a hinge part having a pair of spaced-apart bosses, said bosses having -a common longitudinal axis, attaching means extending laterally from said bosses and formed integral therewith, said bosses having inner end surface portions facing one another, said inner end surface portions being spaced-apart a distance greater than the distance between said end portions of said sleeve means, said sleeve means being positioned between said bosses with said longitudinal axis of said bore substantially coincidental with said longitudinal axis of said bosses, cam track means attached to at least one of said bosses against axial and rotational movement relative to said bosses, said cam track means being received in said bore and being in engagement with said cam means, said cam means and said cam track means cooperating with one another to provide relative axial movement between said sleeve and said bosses upon relative rotational movement between said hinge member and said hinge part.

20. The device of claim 18 and further including a hinge part having a pair of spaced-apart bosses having common attaching means formed integrally therewith and extending laterally therefrom, said sleeve means being positioned between said bosses, a hinge pintle extending through said bore in said sleeve means, said pintle having pintle end portions, means for supporting said pintle end portions on said bosses, and cam track means in fixed position with respect to said pintle, said cam means being rotatable with said sleeve means for camming contact with said cam track means.

21. A cam member for a gravity operated hinge assembly comprising, an elongated cylindrical member having first and second opposite end portions, a substantially cylindrical outer surface of substantially uniform diarneter from said first to said second end portions, said first end portion having ange means extending radially outward therefrom, said first end portion having an enlarged bore therein extending axially of said cylindrical member, said bore terminating in a circumferentially extending cam track, and a hinge pintle receiving hole extending axially through said cylindrical member from said second end portion to said bore, said hole opening into said bore adjacent said cam track and having a smaller diameter than said bore.

22. The cam member of claim 21 and further including radially extending projection means on said outer surface of said cylindrical member.'

23. An invertible cam operated hinge assembly designed for selective application to right and left hand door bodies and associated doorframe members comprising; a rst hinge part presenting a pair of spaced symmetrical supporting Sleeves having common integral attaching means extending laterally therefrom7 a second hinge part including integral one-piece riding sleeve means and attaching means extending laterally from said sleeve means, said sleeve means being positioned between said supporting sleeves and being designed to reciprocate between said supporting sleeves, said sleeve means having spaced apart end portions and a substantially cylindrical bore therethrough, said bore having a longitudinal axis and a substantially cylindrical wall surface, a hinge pintle extending through said bore, Said pintle having end portions, means for adjustably securing said end portions of Said pintle to said supporting sleeves, Stationary cam means presenting a spaced pair of symmetrical cam tracks substantially contained within said bore, riding cam means removably positioned in said bore intermediate said sleeve end portions, said riding cam means extending from Said sleeve Wall surface toward said longitudinal axis, said riding cam means being formed separate from 24 said one-piece sleeve means and attaching means and being removably ixed in said bore against axial and rotational movement relative to said bore, said spacedapart end portions of said sleeve means defining rst and second end portions, said riding cam rneans being selectively positionable in two selected positions for selective camming Contact with either one of said pair of cam tracks of said stationary cam means, one of said selected positions being closer to said rst end portion than to said second end portion, and the other of said selected positions being closer to said second end portion than to said first end portion.

References Cited UNITED STATES PATENTS 735,142 3/1905 Winter 16-153 881,308 3/1908 Donaldson 16-153 1,046,209 12/1912 Mercer 16-153 1,049,072 12/1912 Frey 16-153 2,222,965 11/1940 Veena-,1 16-153 3,107,758 10/1963 Benham 16-182X 3,134,134 5/1964 Mccubbin 16-153 FOREIGN PATENTS 626,031 10/1961 Italy.

DONALD A. GRIFFIN, Primary Examiner