US3089330A

US3089330A - Lock assembly for a refrigerated cabinet or the like

Info

Publication number: US3089330A
Application number: US157793A
Authority: US
Inventors: William J Kerr
Original assignee: Chicago Lock Co
Current assignee: Chicago Lock Co
Priority date: 1961-12-07
Filing date: 1961-12-07
Publication date: 1963-05-14
Anticipated expiration: 1980-05-14

Description

w. J- KERR 3,089,330

LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE May 14, 1963 4 Sheets-Sheet 1 Filed Dec. 7, 1961 WILLIAM J. KERR W. J. KERR May 14, 1963 LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE 4 Sheets-Sheet 2 Filed Dec. '7, 1961 m I W\\\\\\\\\ May 14, 1963 W. J. KERR Filed Dec. 7, 1961 LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE 4 Sheets-Sheet 3 30 34 8 56 M FL l 1 6 1 az "\II 12 66 ,11 6,6 1 15 E l I I 1% I '74 5 g: t

WILLIAM J. KERR W. J. KERR May 14, 1963 LOCK ASSEMBLY FOR A REFRIGERATED CABINET OR THE LIKE 4 Sheets-Sheet 4 Filed Dec. 7, 1961 $2251; 2:: WILLIAM J. KERR United States Patent 3,089,330 LOCK ASEMBLY FGR A REFRIGERATED CABINET OR THE LIKE William J. Kerr, Glenview, IiL, assignor to Chicago Lock Company, Chicago, lliL, a corporation of Illinois Filed Dec. 7, 1961, Ser. No. 157,793 11 Claims. (Cl. 70-140) The present invention relates generally to door lock assemblies for cabinets, and has particular reference to a draw lock assembly of the nested-handle type wherein the usual rotatable draw shaft is given added impetus by means of an operating leverage-applying handle which is located on and accessible from the outside of the door to which the lock assembly is applied, and when the door is in its locked condition, may be pushed manually into a well, pocket or recess where it is inaccessible for ma nipulation until released by actuation of the lock proper.

The improved draw lock comprising the present invention has been designed for use primarily in connection with a coin-operated, refrigerated vending machine cabinet of the type which is commonly utilized in public places and serves as a medium for dispensing such products as milk, bottled soft drinks, measured quantities of soft drinks in paper cups or other drinking containers, prepared sandwiches, and the like. The invention may, however, be found useful in connection with a nonrefrigerated vending machine cabinet for dispensing chewing gum, candy bars and edible products of a similar nature, or with a vending machine which is designed to dispense such articles as toothbrushes, combs, handkerchiefs, razors, and a Wide variety of sundries too numerous to mention. Irrespective, however, of the particular use to which the present draw lock may be put, the essential features of the invention are at all times preserved.

The cabinet door of a vending machine, particularly a refrigerated vending machine, is heavily gasketed, and upon closure thereof, it is necessary to compress the gasket tightly so that there will be no heat losses around the door jamb. The degree of pressure which must be exerted by the marginal region of a given door against its sealing gasket to effect the necessary hermetic seal is appreciable, considering the size of the average refrigerated vending machine door. For this reason, suflicient torque cannot be applied to the draw shaft through the medium of the key-operated lock cylinder of the door-locking mechanism to move the usual cam-type locking element (screw thread or radial cam) on the inner end of the draw shaft to its operative or locked position. To supply the added degree of torque necessary to turn the draw shaft, it has been customary to provide a leverage handle which turns with the draw shaft, the handle being disposed on the outside of the cabinet door. To prevent unauthorized manipulation of the handle or attempts to manipulate the handle by forcing the same when the door is locked, an elongated recess is provided in the lock housing and the handle and draw shaft are slidably keyed or otherwise connected together so that, when the door is in its locked condition, the handle may be radially aligned with the recess and then moved thereinto and retained therein so that access to the handle for turning purposes is preeluded.

A present-day draw lock assembly of the type briefly outlined above is possessed of one serious limitation arising from the fact that, in the case of a draw shaft with the locking element in the form of a screw thread, when the draw shaft has been tightened in the cooperating nut provided for it on the cabinet framework to such an extent that the gasket is compressed sufliciently to effect the desired seal, the handle may or may not, depending on change, be in alignment with the recess in the lock housing of the assembly. If the handle is not in alignment with 3,089,330 Patented May 14, 1963 the recess, further turning of the handle in a locking direction to bring it into alignment with the recess can only be accomplished by the application of an inordinate amount of torque to the handle, sometimes of such magnitude that it is not within the capabilities of the operator to exert it. Backing-oil? of the handle will, of course, reduce the pressure on the gasket and may destroy the seal.

A similar limitation is attend-ant upon the construction and use of a draw lock assembly of the radial cam-type, although because the locking cam seldom is obliged to move through an angular extent of more than 90 in connection with movement into and out of its locked position, handle and recess misalignment in the fully locked condition of the cam is less likely to occur, or if it does occur, the remedy therefor requires a smaller degree of reverse rotation of the draw shaft than is usually the case with a screwin type of draw lock assembly. For this reason, the invention has been illustrated and described herein in connection with a draw lock assembly of the screw-in type although it is within the purview of the invention to utilize the invention for facilitating handle and recess alignment in the case of a cam-type draw lock assembly.

The present invention is designed to overcome the above-noted limitations that are attendant upon the construction and use of present-day draw lock assemblies employing nested handles, and particularly draw locks of the screw-in type. Accordingly, the invention contemplates the provision of a compound lost-motion connection between the handle and draw screw, such connection establishing a positive drive between the handle and draw screw during a door-tightening operation, but allowing for an appreciable degree of reverse movement of the handle after the tightening operation has been completed, such reverse movement being dis-associated from the draw screw so that the latter will remain in its fully advanced position of maximum gasket compression.

The provision of a draw lock assembly of the character briefly outlined above being among the principal but general objects of the invention, it is a specific object to provide a draw lock assembly having such a compound lostmotion connection and wherein the connection includes a rota-table cage member which is capable of rotational pound lost-motion connection is comprised of parts which interfit loosely and are loosely put together so that, during operation of the assembly, there will be no binding of parts or undesired transmission of motion from one part to a coacting or associated part.

Apart from the matter of forward and reverse driving connections for the draw screw, it is another object of the invention, in a nested-handle type of draw lock assembly, to provide a novel latch mechanism for maintaining the handle in its extended position forwardly of the handlereceiving recess in the [front lock housing, means being provided whereby, during lock cylinder-changing operations when the lock cylinder is removed from the surrounding lock barrel and the latch pin associated with the latch mechanism is thus exposed, the latch pin is retained in a temporary posit-ion and prevented from being forcibly projected from the barrel under the motivating action of the usual biasing spring which is associated therewith.

Numerous other objects and advantages of the invention, not at this time enumerated, will be apparent from a consideration of the following detailed description.

In the accompanying four sheets of drawings forming a part of this specification, a preferred form of the invention has been illustrated.

In these drawings:

FIG. 1 is a fragmentary front elevational view of a draw lock assembly constructed in accordance with the principles of the present invention, the assembly being operatively installed in a cabinet door panel and on the basis that the locking screw thereof is in its final or home position and the operating handle is in an overrun position vention;

FIG. 6 is a side elevational view of the structure shown in FIG.

FIG. 7 is a sectional view taken on the 'line 7-7 of FIG. 6',

FIG. 8 is a sectional view taken on the line 88 of FIG. 6;

FIG. 9 is a front elevational view similar to FIGS. .1 and 5, but showing the operating handle fully restored to a position of register with the handle-receiving recess as permitted by both sections of the compound lost-motion connection;

FIG. 10 is a side elevational view of the structure shown in FIG. 9;

FIG. 11 is a sectional view taken on the line 1111 of FIG. 10;

FIG. 12 is a sectional view taken on the line 1212 of FIG. 10;

FIG. 13 is a side elevational view similar to FIGS. 2, 6 and 10, but showing the handle nested within the handlereceiving recess;

FIG. 14 is a sectional view taken on the line 1414 of FIG. 13;

FIG. 15 is a fragmentary side elevational view, partly in section, of a novel latch mechanism employed in connection with the present invention and showing the latch pin proper in its environment in the lock barrel; and

FIG. 16 is an enlarged fragmentary view, partly in section and partly in elevation, illustrating certain details of the compound lost-motion connection.

Referring now to the drawings in detail, and in particular to 'FIGS. 1 and 2, a draw lock assembly constructed in accordance with the principles of the present invention has been designated in its entirety by the reference numeral 10, and for exemplary purposes, its environment may be regarded as that of a commercial refrigerated vending machine cabinet having a swinging door. Only the front panel of the door has been illustrated in the drawings and it is designatedby the reference numeral 12 (see FIG. 2). The door, when closed, is adapted to be drawn against a flexible rubber or other elastomeric sealing strip 13, the normal Width of which in the free state thereof, is indicated at a in FIG. 2. The sealing strip 13 extends around the door jamb14 in the usual manner and establishes a tight seal between the inside and the outside of the cabinet.

The pressure necessary to draw the door against the gasket 13 is effected under the control of a draw screw 16 having a threaded portion 18 on its inner end. Such portion 18 constitutes the draw screw proper and is designed for threaded cooperation with a cage nut 20. The latter is held in a floating manner within an encompassing cage 24 which is mounted on a fixed bracket 26 in the usual manner of draw screw and nut cooperation. It will be understood that, as the draw screw is tightened in the nut 20, the door will be drawn forwardly, i.e., to the left as viewed in FIGS. 1, 5 and 9, to the end that it will compress the gasket 13 against the jamb 14 and effect the desired seal. In the fully compressed condition of the gasket 13, the width thereof is reduced from the width a to the width b (see FIG. 2). The entire door, including the look assembly 10 and its draw screw 16, moves forwardly during gasket-tightening operations and the front end of the draw screw thus moves from the position indicated by the dotted line a to the position indicated by the dotted line b.

The draw lock assembly 10 further involves in its general organization a front housing 39' and a rear supporting plate 32, such two parts being connected together and maintained in spaced apart relationslnp by elongated, horizontallly extending, spacer bars 34 which are rectangular in transverse cross section. The front housing 36 is mounted within a rectangular opening 36 in the door panel 12 and is held therein by any suitalbe means such as screws 38. The mounting means for the front housing, in the illustrated environment of the lock assembly, constitutes the sole supporting means for the lock assembly as a whole and the lock assembly is thus entirely supported from the panel 12.

The front housing 30 of the lock assembly is generally rectangular in vertical cross section and an appreciable vertical extent and a small transverse width. Preferably, the housing 30 is in the form of a die casting having a rim flange 40 which fits flush against the outside face of the panel 12 when the lock assembly is installed in the door. The front face of the housing 30 is provided with a shallow rectangular recess 42 for reception therein of a torque-applying operating handle 44, the nature and function of which will be explained in greater detail presently. It is sufficient to say for the present that the handle 44 serves to drive or rotate the draw screw 16 in opposite directions for door-locking and releasing purposes through the medium of the compound lost-motion connection which constitutes one of the major features of the present invention. The recess 42 is formed by a bottom wall 46 and, in addition, a forwardly extending marginal wall 48 from which the rim flange 40 extends laterally. The marginal wall 48 is shaped conformably to the opening 36, fits snugly therein, and constitutes an integral part of the housing 36.

The rear supporting plate 32 is preferably formed of heavy gauge stamped metal and is of diamond shape or configuration, as shown in dotted lines in FIG. 1. It has formed in its central portion, an opening 50 through which the draw screw 16 projects and within which the screw is rotatable. The plate 32 thus constitutes a rear bearing member for the draw screw 16. The edges of the plate 32 are provided with laterally turned retaining ears 54 which, in combination with one another, define a retaining seat for a handle-projecting spring 56', the operation of which will be explained presently. The draw screw 16 is prevented from axial shifting movement through the opening 50 in the plate 32 by reason of a shoulder 57 on the draw screw and at one side of the plate 32, and a split retaining ring 58 on the other side of the plate.

The ventical bottom Wall 46 of the front housing 30 is formed with a central axial bore 66 and a coaxial sleeve bearing 61 within which there is rotatably and slidably received the cylindrical hub portion 62 of the rotatable torque-applying handle 44. The front housing thus constitutes a bearing member for the hub portion 62. The handle 44 includes a pair of oppositely extending lever arms 64 which are arranged in alignment on opposite sides of the hub portion 62. The handle 44 is slidable horizontally and axially between the retracted position r wherein it is shown in FIG. 13, and the extended position wherein it is shown in FIG. 2. In its retracted position, the lever arms 64 are maintained wholly within the confines of the shallow rectangular recess 32. In the extended position of the handle, the lever arms 64 are disposed an appreciable distance forwardly of the vertical plane of the door panel 12.

The rear end of the hub portion 62 of the handle 44 is reduced as at 66 (see FIG. 16) and projects into one open end of a generally cylindrical, floating, cage member 68. The other open end of a cage member 68 receives therein the forward forked end region 69 of the draw screw 16. The cage member 68 thus, in effect, serves as a connecting sleeve between the handle 44, which constitutes a driving member, and the draw screw 16, which constitutes a driven member. The cage member 68 constitutes the principal part of a compound lost-motion connection between the handle and draw screw. This lostmotion connection has been designated in its entirety by the reference numeral 70 and serves the purpose of establishing a driving connection in either direction from the handle 44 to the draw screw 16, drive in one direction serving to tighten the draw screw in the cage nut 20 for door-closing purposes, and drive in the other direction serving to permit the handle to be aligned with the recess 42 in the event that during draw screw-tightening operations, the handle has overrun its position of alignment with the recess, all in a manner and for a purpose that will become clear presently.

The compound lost-motion connection 70 which includes the cage member 68 embodies two lost-motion sections which operate in series, so to speak, during the taking-up of the entire extent of the lost-motion in either direction of rotation. These lost-motion sections have been designated by brackets labelled A and B in FIG. 16. Each section is so designed that it will permit a reverse rotational movement of its input member through an angular extent of slightly greater than 90 without involving rotational movement of its output member. The input member for the lost-motion section A is the hub portion 62 of the operating handle 44 and output member of the section A is the cage member 68. The input member for the lost-motion section B is the cage member 63, while the output member is the draw screw 16. Since the operating handle 44 and the recess 42 are each symmetrical on opposite sides of a medial plane so that the handle may enter the recess in either of two positions 180 apart, a reverse rotation of the handle through an angle of greater than 180 is never required after the handle has overrun its position of registry with the recess to bring the same back to a position of registry where it may enter the recess. The two lost-motion sections A and B, operating in series, will thus accommodate the maximum angle of handle overrun of which the handle is capable.

The lost-motion section A exists by reason of a crosspin 71 which extends diametrically through the reduced portion 66 of the handle hub portion 62. The ends of the pin extend radially outwardly beyond the outer cylindrical surface of the portion 66 and project through respective circumferentially extending slots 72 in the body of the cage member 68. Each slot has an effective length slightly in excess of 90. The two slots 72 are diametrically disposed across the cage member 68 and are of equal extent. The two slots have their corresponding opposite ends in diametric opposition respectively. Thus, at such time as the pin 71 is in engagement with an end of one slot, it will also be in engagement with an end of the other slot. With the pin 71 bearing against the corresponding ends of the slots 72, the hub portion 62 of the operating handle 44 may be turned in one direction or the other, as the case may be, without disturbing the position of the cage member 68. During such turning of the handle, the pin 71 will ride freely in both slots and completely traverse the same. The portions of the cage member 68 which are disposed between the ends of the slots 72 constitute, in effect, oppositely disposed spaced 6 apart abutments for engagement by the projecting ends of the pin 71.

The lost-motion section B exists by reason of a crosspin 74 which extends diametrically through a longitudinal open-ended slot 76 in the forward forked end 69 of the draw screw 16. The cross-pin 74 is thus freely and axially slidable in the slot 76. The outer ends of the pin 74 extend radially outwardly beyond the confines of the forked end 69 of the draw screw 16 and project through respective circumferentially extending slots 78 in the body of the cage member 68. Each slot 78 has an effective length slightly in excess of 90 and the lengths of the two slots 78 are equal. The slots are diametrically disposed across the cage member and the opposite ends thereof are in respective diametric opposition.

The lost-motion section B is thus similar in its design and mode of operation to the lost-motion section A, the principal difference between the two sections being that the section B allows for relative axial shifting between its input member (cage member 68) and its output member (draw screw 16), whereas the section A prevents such relative axial shifting between its input and output members. With the pin 74 bearing against the corresponding ends of the two slots 78, the cage member 68 may be turned in one direction or the other, as the case may be, without disturbing the position of the draw screw 16. During such turning of the cage member 68, the pin 74 will ride freely in the slots 78 and completely traverse the same. The pin 74 will not shift its position axially in the slot 76 during such turning movement inasmuch as the draw screw 16, while being fed into the cage nut 26, will pull the plate 32 forwardly and, consequently, will pull the entire lock assembly '10 and the door panel 12 forwardly to compress the sealing strip 131 (see FIG. 2). The only time that the pin 74 moves in the slot 76 is during axial shifting of the handle 44 into and out of the recess 42 in the front housing 30.

Except for certain constructional details and for a novel form of latch arrangement whereby the handle is maintained in its retracted position when the door is closed,

the essential features of the invention have been set forth above. Among these constructional details is the provision of a central radial flange 80' on the cage member 68. Such flange provides a hearing or reaction seat for the forward end of the spring 56 and, in addition, a means for fioatingly and loosely maintaining the two

pins

70 and 74 in position within their respective retaining members and slots.

The various relatively movable parts of the compound lost-motion connection 70 are loosely put together and fit loosely with respect to one another. As best shown in FIG. 16, there is an appreciable annular clearance between the forked end 69 of the draw screw =16 and the surrounding Wall of the cage member 68. There is an annular clearance between the reduced portion 66 of the hub portion 62 of the handle 44 and the wall of the cage member 68. As shown in FIG. 3, the pin 71 extends through a diametric bore 82 which is of larger diameter than that of the pin. The width of the slot 76 in the forked end 69 of the draw shaft 16 also is wider than the diameter of the pin 74. The

slots

72 and 78 are appreciably wider than the diameter of the

pins

71 and 72 and the effective length of the pins is somewhat longer than the external diameter of the cage member at the regions where the pins project outwardly of the slots. Each pin is held in position or against lengthwise displacement by means of an enlarged head 84 at one end thereof and a split ring 86 at its other end, the head and ring overhanging the edges of the associated slot.

The previously-mentioned latch arrangement, whereby the handle '44 of the draw lock assembly is maintained in the retracted nested position within the recess 42 in either position of registery of which it is capable of assuming, is best illustrated in FIGS. 13, 14 and 15. The

arrangement includes a latch pin .100 which is slidable radially in a groove or guideway 102 in the bottom wall of a relatively deep socket 1&4. The latter is formed in the hub portion 62 of the handle 44. The socket 104 receives therein a conventional tumbler-type lock unit, the outer barrel of which is designated by the reference numeral 1% (see FIGS. 1, 5, 9 and 13), and the inner rotatable tumbler-equipped lock cylinder of which is designated by the reference numeral 1%. The cylinder 1%? is operable under the control of a key 1113 (see FIG. 2). The latch pin 101} is formed with a lateral inner ledge portion 112 and a lateral outer ledge portion 116. A short eccentnic pin 118 is formed on the rear end face of the lock cylinder 108 and projects into the space existing between the two

ledge portions

112 and 116. A spring 120 bears at one of its ends against the bottom wall of a seat-forming depression 122, extends into a relatively deep socket 124 in the body portion of the pin 1% and normally urges the pin radially outwardly of the hub portion 62 of the handle 44. Thelatch pin 101) is formed with a cylindrical latch head 126 which is capable of being projected through a square opening 128 in the hub portion 62 of the handle 44, and when so projected, the latch head 126 is designed for latching engagement with the rear end face 130 (see FIG. 13) of the bearing sleeve 62 on the front housing 20.

The sole function of the lock unit is to retract the latch pin 14%) so that the handle 44 and its hub portion 62 may move frontwards and leave the shallow recess 42 under the impelling influence of the spring 56, thus rendering the handle accessible for door-unlocking purposes. Accordingly, the inner ledge portion 112 normally and yieldingly bears radially outwardly against the eccentric pin 118 on the rear end of the lock cylinder 108 so that this ledge portion and, consequently, the latch pin 100 asa whole may follow the radial component of eccentric displacement of the pin 11% relatively to the direction of extent of the guideway 102. In FIG. 14, the latch pin 100 is shown as being projected radially outwardly so that the latch head 126 is in register with the end face 134 of the bearing sleeve 61 of the lock housing 30. However, when the key 110 and the lock cylinder 16% are turned so that the eccentric pin 118 is 180 removed from the position in which it is shown in FIG. 14, it will move the ledge 112 and, consequently, the entire latch pin 16!), radially inwardly of the hub portion 62 of the handle 44 to retract the latch head 126 and move the same out of register with the end face 130 and allow the spring 56 to project the handle and hub portion forwardly to the position wherein it is shown in FIGS. 2, 6 and 10. After the retracted latch pin 100 has moved within the confines of the hub portion 62, the key 1141 may be rotated through an angle of 180 to restore the eccentric pin 11% to the position wherein it is shown in FIG. 14, at which time the ledge portion 112 will be released by the pin 113, but the outer end of the latch head 126 will bear against the inside wall of the bearing sleeve 61 and maintain the latch pin 100 retracted. During turning movement of the lock cylinder 10% in either direction, freedom of movement of the eccentric pin 11% in the guideway 102 is made possible by reason of a pair of arcuate clearance slots '67 in the side walls of the guideway.

Occasionally, it is desired to eflect substitution of one lock unit for another in the hub portion 62 of the handle 44- as, for example, when the operator of the vending machine company quits his job and fails to turn in his key or when a given lock unit requires repair. To facilitate such lock substitution, a set screw 140 (see FIG. 2) extends through the hub portion 62 of the handle 44 and removably holds the lock unit in place. To remove a given lock unit, it is necessary merely to unlock the handle 4-4 and allow the same to become projected forwardly out of the recess 42 so that the set screw 14% is accessible for manipulation. After the set screw has been loosened,

the lock unit is released and the barrel 1% thereof may be pulled forwardly from the socket 104-.

It is obvious that when the lock unit has been removed from the socket 194, the eccentric pin 118 will be withdrawn from its restraining contact with the ledge 112 of the latch pin 16%? and the pin will be free to move radially outwards under the impelling influence of the spring 12%. To prevent such spring ejection, the sleeve bearing 61 has integrally formed thereon two diametrically disposed stop-like latch pin hoods 142 (see FIGS. 2 and 14) which project rearward'ly from the peripheral region of the sleeve bearing 61 and are adapted radially to overlie the outermost end of the latch pin 1% in either of the two positions in which the pin is cap-able of being projected to its operative latching position. These two locations of the latch pin hoods 142 lie in a diametric plane of the sleeve which is at a right angle to the vertical plane of the elongated handle 44 inasmuch as the latch pin 1% cannot be projected from the sleeve bearing except when it is uncovered by the wall thereof at such time as the handle is in a vertical position and is pushed rearwardly into the recess 42 in the front housing 350. By reason of the existence of the two hoods 142, when the lock barrel and cylinder are removed from the socket 1&4 and the ledge portion 112 of the latch pin 1% is released by the eccentric pin 118, the latch pin 1G1 is freed for outward radial movement under the impelling influence of the spring 120 so that it may engage the inner face of whichever hood 142 may overlie the same during such dismantling operations.

It is to be noted that at such time as the end of the iatch pin is in engagement With one of the two hoods 14 2, the eccentric pin 118 assumes a position relatively to the guideway 1G2 sufficiently removed from the seat-forming socket 122 that it is the operative hood 142 which restrains the latch pin against outward movement rather than the eccentric pin. Thus, when a new lock unit is installed within the socket 164, the ledge portion 112 will not obstruct the entrance of the lock unit and the latter may be pushed into the socket to its full home position therein and the pin 118 will move into position between the two

ledge portions

112 and 116.

The figures of the drawings from FIG. 1 to FIG. 12 illustrate progressively the operation of the lock assembly 10 in such a manner as to overcome the problem of overrunning of the handle 44 beyond a position of alignment with the recess 42 and at such time as the draw screw 16 has been tightened for door-locking operations to the fullest extent of which it is capable of being tightened without requiring an inordinate degree of torque. In FIGS. 1 to 4, inclusive, the parts are in the position which they assume when the draw screw 16 is tight in the cage nut 20, but the handle, instead of being in alignment with the recess 4-2 in either of the two positions wherein it is capable of such alignment, has overrun one of these positions by an angular extent of approximately In FIGS. 5 to 8, inclusive, the handle has been turned in a reverse direction approximately 90 to take up the lostmotion in the section B of the lost-motion connection 7%, the section A, as yet, remaining undisturbed. In FIGS. 9 to 12, inclusive, the handle has been restored to a position of alignment with the reces 42 by turning the same in a reverse direction from the position wherein it is shown in FIG. 4 throughout an angular extent of approximately 45", this angular motion being the amount necessary to move the handle through the final remaining angular extent to a position of registry with the recess and representing a partial taking-up of the lost-motion of the lost-motion section A. The position of the parts as shown in FIG. 16 is an abnormal position wherein the cross-pins 71 and 74 are disposed medially in their

respective slots

72 and 78 and the lost-motion of each section A and B is partially taken up. this abnormal position of parts ha been selected merely because, in such posit on, the parts are clearly visible for disclosure purposes.

Assuming now that the cabinet door is to be closed and locked, the door is moved or swung towards its closed position and the end of the draw screw 16 is caused to register with and engage the cage nut 20. Thereafter, turning of the handle 44 in a clockwise direction, as shown in FIGS. -1, and 9, will establish a direct drive from the handle through the hub portion 62 to the cross-pin 71. The opposite end regions of the cross-pin 71 will engage the ends of the two diametrically-disposed slots 72 and drive the cage member 68. The ends of the two slots 78 in the cage member will then engage the opposite end regions of the cross-pin 74 and the latter will, by reason of its disposition in the open-ended slot 76 in the forked end region 69 of the draw screw 16, drive the draw screw and cause the same to be threaded into the cage nut 20. Threaded movement of the draw screw 16 into the cage nut 20 will effect rearward or closing movement of the entire lock assembly and, consequently, of the cabinet door. Such closing movement of the door will serve to effect compression of the gasket 13 (see FIG. 2) and, at such time as the gasket 13 has been fully compressed, the handle 44 may or may not, depending on chance, assume a position of registry with the recess 42 in the front housing 30. If the handle is in a position of registry with the recess 42, it is necessary merely to turn the key 110 to a position wherein the eccentric pin 118 (see FIG. 14) releases the ledge portion 112 of the latch pin 100, and then push the handle into the recess 42, at which time the latch pin will move radially outwardly in the guideway 102 and assume its latching cooperation with the end face 130 of the bearing sleeve 61, as previously described.

Since, however, it is to be assumed, for purposes of discussion herein, that the handle will overrun its position of registry with the recess 42 by an angular extent of 135, and that the operator is incapable of forcing the handle any further in a clockwise direction to complete the necessary 45, which would bring it to a position of alignment with the recess, it is necessary that the handle be turned in the opposite direction throughout an angle of 135. The compound lost-motion connection 70 makes this possible without disturbing the home position of the draw screw 16.

During reverse turning movement of the handle throughout the first 90, the handle and its hub portion 62 are free to move without disturbing the position of any other part of the lock assembly. The end regions of the cross-pin 71 will move out of engagement with certain ends of the slots 72 into which they project and traverse the slots so as to move into driving engagement with the other ends thereof, thus taking up all lostmotion in the section A. The commencement of this movement is illustrated in FIG. 3, and the termination thereof is illustrated in 'FIG. 7.

Referring now to FIGS. 5 to 8, inclusive, further reverse turning movement of the handle 44 results in an initial movement of the cage member 68 due to the driving action of the pin 71. The pin 71 may be said to pick up the cage member at the 90 point and carry it through to the 135 point, during which time the end regions of the cross-pin 71 engage the corresponding ends of the two slots into which this pin projects. At the time that the handle 44 is restored to a position of registry with the recess 42, the cage member will have moved only 45 in a reverse direction. The position of the cross-pin 74, therefore, will not be disturbed and there will be no reverse movement of the draw shaft 16.

Since the combined extent of the lost-motion made effective by the two serially-operable lost-motion sections A and B is slightly in excess of 180, the cross-pin 74 at no time is obliged to exert a reverse driving effect on the draw shaft during handle restoration operations. Only when the cabinet door is to be unlocked does the cross-pin 74 engage the ends of the slots 78 in reverse driving relationship.

After the handle 44 has been restored to its position of registry with the recess 42, it is pushed axially into the recess, and during the axial movement thereof, the pin 74 travels rearwardly in the slot 76 in the forked end 69 of the draw screw 16 without disturbing the angular positionof the draw shaft.

The invention is not to be limited to the exact arrangement of parts shown in the accompanying drawings or described in this specification as various changes in the details of construction may be resorted to without departing from the spirit of the invention. Therefore, only insofar as the invention has particularly been pointed out in the accompanying claims is the same to be limited.

Having thus described the invention what I claim as new and desire to secure by Letters Patent is:

1. In a draw lock for a sealed cabinet door, in combination, a housing structure adapted to be installed in a door lock opening and presenting spaced front and rear internal bearings respectively, said housing structure presenting a front face provided with a shallow elongated recess, an operating handle positioned forwardly of the housing structure and front bearing and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front face of the housing structure and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the housing structure and out of the recess, a connecting sleeve the opposite ends of which are open and into which ends the hub portion and draw screw project respectively, means establishing a rotary driving connection between the sleeve and the hub portion, means establishing a rotary driving connection between the sleeve and the draw screw, one of said two last mentioned means pro viding for a limited degree of circumferential lost-motion between the sleeve and the member to which the sleeve is drivingly connected by said one means, and one of said two last mentioned means providing for axial shifting between the sleeve and the member to which the sleeve is drivingly connected by said latter one means.

2. In a draw lock for a sealed cabinet door, in combination, a housing structure adapted to be installed in a door lock opening and presenting spaced front and rear internal bearings respectively, said housing structure presenting a front face provided with a shallow elongated recess, an operating handle positioned forwardly of the housing structure and front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front face of the housing structure and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the housing structure and out of the recess, a connecting sleeve the opposite ends of n which are open and into which ends the hub portion and draw screw projectv respectively, means establishing a rotary driving connection between the sleeve and hub portion, means establishing a rotary driving connection between the sleeve and draw screw, said last mentioned means providing for a limited degree of circumferential lost-motion between the sleeve and draw screw, said last mentioned means also providing for axial shifting between the sleeve and draw screw.

3. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said bear-ing members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member and out of the recess, a connecting sleeve the opposite ends of which are open and into which ends the hub portion and draw screw project respectively, means establishing a rotary driving connection between the sleeve and draw screw while permitting relative axial shifting therebetween, means establishing a rotary driving connection between the sleeve and hub portion, said last mentioned means providing for a limited degree of circumferential lost-motion between the sleeve and hub portion.

4. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said bearing members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member and out of the recess, a connecting sleeve the opposite ends of which are open and into which ends the hub portion and draw screw project respectively, means establishing a rotary driving connection between the sleeve and draw screw while permitting relative axial shifting therebetween, means establishing a rotary driving connection between the sleeve and hub portion, each of said two last mentioned means providing 1.2 for a limited degree oflcst-motion between the sleeve and hub portion.

5. in a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front hearing member, means fixedly securing said bearing members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member and out of the recess, a connecting sleeve the opposite ends of which are open and into which ends the hub portion and draw screw project respectively, means establishing a rotary driving connection between the sleeve and draw screw, means establishing a rotary driving connection between the sleeve and hub portion, each of said two last mentioned means providing for a limited degree of circumferential lost-motion between the sleeve and the member to which the sleeve is drivingly connected by said means, and one of said two last mentioned means providing for relative axial shifting between the sleeve and the member to which the sleeve is drivingly connected by said one means.

6. In a draw lock for a sealed cabinet door, the combination set forth in claim 5 and wherein said one means comprises the means establishing a rotary driving connection between the sleeve and the draw screw.

7. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said bearing members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member and out of the recess, a connecting sleeve the opposite ends of which are open and into which ends the hub portion and draw screw project respectively, said sleeve being formed with a circumferentially extending arcuate slot therein, a radially extending pin projecting outwardly from said hub portion and extending loosely into said slot, said pin and slot establishing a two way rotary lost-motion driving connection between the hub portion and the sleeve, and means establishing a twoway driving connection between the sleeve and draw 13 screw while permitting axial shifting of the sleeve relatively to the draw screw.

8. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said bearing members in their spaced relationship, said front bearing memher being provided with a shallow elongated recess in the forward face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member and out of the recess, a connecting sleeve the opposite ends of which are open and into which ends the hub portion and draw screw project respectively, said sleeve being formed with a circumferentially extending arcuate slot therein, a radially extending pin projecting outwardly from said hub portion and extending loosely into said slot, said pin and slot establishing a two-way rotary lost-motion driving connection between the hub portion and sleeve, said sleeve being formed with a second circumferentially extending arcuate slot therein, a second radially extending pin projecting outwardly from said draw screw and extending loosely into said second arcuate slot, said second pin and slot establishing a twoway rotary lost-motion connection between the sleeve and draw screw, one of said pins being axially shiftable in the member from which it projects outwardly.

9. In a draw lock for a sealed cabinet door, the combination set forth in claim 8 and wherein said axially slidable pin projects outwardly from the draw screw.

10. In a draw lock for a sealed cabinet door, in combination, a front bearing member adapted to be installed in a door lock opening through the outside face of the door, a rear bearing member spaced from said front bearing member, means fixedly securing said bearing members in their spaced relationship, said front bearing member being provided with a shallow elongated recess in the forward free face thereof, an operating handle positioned forwardly of the front bearing member and having a hub portion slidable axially and rotatable in the latter, a draw screw projecting through the rear bearing member in axial alignment with said hub portion, means preventing endwise axial shifting of the draw screw, said draw screw being provided with a threaded portion adjacent the rear end thereof designed for threaded cooperation with a substantially fixed reaction nut on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front bearing member and being movable with the hub portion bodily as a unit between a retracted position wherein the handle is in an angular position of register with and is wholly contained within said recess, and an extended position wherein the handle is projected forwardly of the front bearing member and out of the recess, said handle and recess being symmetrical on on posite sides of a medial plane so that the handle may enter the recess in either of two angular positions which are apart, said handle and hub portion being formed with a cylindrical socket therein, a lock assembly including a lock barrel and lock cylinder disposed within said socket, means disposed within the socket defining a diametrically extending guideway, a latch pin slidable in said guideway and movable between a retracted position wherein it is disposed wholly within the confines of the socket and an advanced position wherein it is pr jected radially outwardly of the socket, said latch pin being operable under the control of said lock assembly, means normally urging said hub portion and handle toward their advanced position whereby when the latch is projected radially outwardly of the socket it Will engage the rear face of the front bearing member, and a pair of latch pin restraining hoods formed on the front bearing member, one of said hoods being positioned in the path of projection of the latch pin when said handle is retracted and assumes one of said two angular positions, the other hood being positioned in the path of said latch pin when the handle is retracted and assumes the other of said two angular positions.

11. In a draw lock for a sealed cabinet door, in combination, a housing structure adapted to be installed in an opening in the door and embodying front and rear internal bearings, said housing structure having a front face provided with a shallow elongated recess therein, an operating handle positioned forwardly of said housing structure and having a hub portion projecting rearwardly through the front internal bearing and rotatable and axially slid'able therein, a draw shaft projecting forwardly through the rear bearing and in axial alignment with said hub portion, means for preventing axial shifting of the draw shaft, means on said draw shaft rearwardly of the rear bearing and designed for engagement with a substantially fixed coacting reaction surface on a cabinet to which the door is applied, said operating handle being shaped conformably to the shape of the recess in the front face of the housing structure and being movable with said hub portion bodily as a unit between a retracted position wherein the handle is in angular position of register with and is wholly contained within said recess and an extended position wherein the handle is projected forwardly of said housing structure and out of the recess, and means establishing a two-way lost motion driving connection between the hub portion of the operating handle and the draw shaft while permitting axial shifting of the hub portion in either direction, said last mentioned means including a pair of spaced apart abutments on opposite sides of the common axis of the hub portion and the draw shaft and in connected relation with the hub portion of the operating handle, and a crosspin carried by and projecting transversely through the draw shaft and presenting outwardly projecting end portions which are engageable with said abutments.

References Cited in the file of this patent UNITED STATES PATENTS 1,908,980 Heyel May 16, 1933 1,932,048 Robertson Oct. 24, 1933 2,098,012 Papst Nov. 2, 1937 2,334,012 Koch et a1 Nov. 9, 1943 2,460,613 Whelan et al Feb. 1, 1949

Claims

1. IN A DRAW LOCK FOR A SEALED CABINET DOOR, IN COMBINATION, A HOUSING STRUCTURE ADAPTED TO BE INSTALLED IN A DOOR LOCK OPENING AND PRESENTING SPACED FRONT AND REAR INTERNAL BEARINGS RESPECTIVELY, SAID HOUSING STRUCTURE PRESENTING A FRONT FACE PROVIDED WITH A SHALLOW ELONGATED RECESS, AN OPERATING HANDLE POSITIONED FORWARDLY OF THE HOUSING STRUCTURE AND FRONT BEARING AND HAVING A HUB PORTION SLIDABLE AXIALLY AND ROTABLE IN THE LATTER A DRAW SCREW PROJECTING THROUGH THE REAR BEARING IN AXIAL ALIGNMENT WITH SAID HUB PORTION, MEANS PREVENTING ENDWISE AXIAL SHIFTING OF THE DRAW SCREW, SAID DRAW SCREW BEING PROVIDED WITH A THREADED PORTION ADJACENT THE REAR END THEREOF DESIGNED FOR THREADED COOPERATION WITH A SUBSTANTIALLY FIXED REACTION NUT ON A CABINET TO WHICH THE DOOR IS APPLIED, SAID OPERATING HANDLE BEING SHAPED CONFORMABLY TO THE SHAPE OF THE RECESS IN THE FRONT FACE OF THE HOUSING STRUCTURE AND BEING MOVABLE WITH THE HUB PORTION BODILY AS A UNIT BETWEEN A RETRACTED POSITION WHEREIN THE HANDLE IS IN AN ANGULAR POSITION OF REGISTER WITH AND IS WHOLLY CONTAINED WITHIN SAID RECESS, AND AN EXTENDED POSITION WHEREIN THE HANDLE IS PROJECTED FORWARDLY OF THE HOUSING STRUCTURE AND OUT OF THE RECESS, A CONNECTING SLEEVE THE OPPOSITE ENDS OF WHICH ARE OPEN AND INTO WHICH ENDS THE HUB PORTION AND DRAW SCREW PROJECT RESPECTIVELY, MEANS ESTABLISHING A ROTARY DRIVING CONNECTION BETWEEN THE SLEEVE AND THE HUB PORTION, MEANS ESTABLISHING A ROTARY DRIVING CONNECTION BETWEEN THE SLEEVE AND THE DRAW SCREW, ONE OF SAID TWO LAST MENTIONED MEANS PROVIDING FOR A LIMITED DEGREE OF CIRCUMFERENTIAL LOST-MOTION BETWEEN THE SLEEVE AND THE MEMBER TO WHICH THE SLEEVE IS DRIVINGLY CONNECTED BY SAID ONE MEANS, AND ONE OF SAID TWO LAST MENTIONED MEANS PROVIDING FOR AXIAL SHIFTING BETWEEN THE SLEEVE AND THE MEMBER TO WHICH THE SLEEVE IS DRIVINGLY CONNECTED BY SAID LATTER ONE MEANS