US3211486A - Mortise lock - Google Patents

Description

Oct. -12, 1965 R. L. CRANDELL MORTISE LOCK 3 Sheets-Sheet 1 Filed NOV. 30, 1962 ATTORNEY Oct. '12, 1965 R. L. CRANDELL MORTISE LOCK Filed Nov. 30, 1962 5 Sheets-Sheet 2 Oct. 12, 1965 R. L. CRANDELL 3,211,486

MORTISE LOCK Filed Nov. 30, 1962 3 Sheets-Sheet 3 INVENTOR. Roy 1. CAfl/VDEZ 4 United States Patent a company of Ohio Filed Nov. 30, 1962, Ser. No. 241,201 7 Claims. (Cl. 292-348) This invention relates to a mortise lock and more particularly to a mortise lock and an operating assembly for that lock comprising a knob and a spindle.

Mortise locks have been manufactured and used for many years. During these years, the industry has always faced the very considerable problem of how to assemble to a mortise lock the necessary knobs and mounting means for the knobs, together with the operating spindles actuated by the knobs. Thus, as those skilled in the art appreciate, a mortise lock when mounted within a door of average thickness leaves only a minimum amount of wood at each side of the lock. The thickness of the wood is not adequate for holding wood screws normally used to fasten in position the roses that support the knobs. To obviate this difficulty, various types of screwless rose assemblies have been proposed but these are too diflicult to apply and are quite costly.

The art has also met the problem by utilizing relatively large escutcheons that extend beyond the lock case. Obviously, these escutcheons are expensive and when applied to a door are difficult to maintain polished and attractive. Further, they are considered objectionable in modern design which requires simplicity of door hardware.

A further difficulty in applying trim, such as roses and knobs, is the matter of alignment, due to the type of retracting mechanism found in mortise locks. Thus, mortise locks are generally equipped with a pair of retractor hubs, one to be operated by an outside knob and one by an inside knob. The outside hub is for certain operations adapted for locking, while the inside retractor hub remains free for rotation. Coacting with these hubs, it is customary to use a single spindle or a swivel spindle comprising two parts secured against endwise separation but with the two parts rotatable relatively to one another. A swivel spindle permits one knob to rotate while the other is locked. At the same time, the swivel spindle serves as a simple element to hold the knobs assembled to the lock, it being customary to insert the outside knob and the spindle into position, and then fasten in place the inside knob. In other Words, the split spindle func tions to permit individual operation of the hubs while holding the knobs and spindle assembled to the lock and door. It is obvious that with spindles of this type, alignment is of the essence, since, if the inside and outside knobs are not properly aligned with the spindles and the hubs, a binding action occurs. Further, the plane of swivel must be accurately located, depite variations in door thicknesses, or the lock will be inoperative. In addition, the plane of swivel must coincide with the plane between the two retractor hubs.

A further difiiculty inherent in mortise locks is the securing of the knobs to the spindles. While one knob may be secured to its spindle through a pin, this being generally true of the outside knob, the other or inner knob is generally secured by a clamping screw or similar device after the outside knob and the single or split spindle have been put into position relatively to the lock and door. These clamping screws disfigure the knob and further, are subject to loosening.

Because of the various inherent difiiculties that I have outlined m mortise locks, a new type of lock known as a cylindrical lock has become exceedingly popular, even though it also has difficulties that are of a different nature. Cylindrical locks, while first developed in order to eliminate mortising of doors, have retained their popularity even though the non-mortising feature has lost its initial value. Thus, when cylindrical locks, or tubular locks as they are sometimes called, were first introduced into the market more than twenty years ago, they were accepted by carpenters because it is relatively simple to drill one bore running inwardly from the edge of the door and a larger bore through the side of the door. This is the type of preparation required for a cylindrical or tubular lock. Mortise locks on the other hand, require a relatively large rectangular cutout in the door, as well as one or more through openings sidewise of the door.

However, in recent years, machinery has been developed so that the mortising of doors can be accomplished very simply at the door manufacturing plant and the boring of the door has no longer the advantage originally conceded to it. Nevertheless, cylindrical and tubular locks have maintained popularity because they eliminate difliculties in alignment, including the alignment of the swivel spindle to the hubs despite variations in door thicknesses. Further, in their most advanced forms, they do not require wood screws for attachment of the roses or knob assemblies. Still further, the knobs are held in position by spring retainers and may be applied automatically.

Much effort has been applied toward the development of a knob assembly to be used wtih a mortise lock of the type having retractor hubs and stop work for the purpose of solving the problems of alignment, adjustment for door thicknesses, the fastening of the knob assembly to a door, and the fastening and holding means for the knobs, together with swivel spindle alignment. These problems have never been solved because of the requirement of two retractor hubs. This is complicated by the need for operating both hubs or but one hub by a spindle traversing both hubs, the spindle being in turn held by knobs assembled to the lock and itself holding the knobs assembled. I believe that through my invention set forth hereinafter, I have solved these difficult problems most effectively while retaining the retractor hub construction of a mortise lock.

As one feature of my invention, I contribute rose assemblies that are adapted to be secured relatively to a mortise lock in a manner that has been found very acceptable by the art. I solve the problems of alignment, door thickness and swivel plane adjustment, by having a separate spindle for each rose assembly, each separate spindle being adapted for automatic movement into proper operating relation to one of the hubs of the mortise lock so as to compensate for varying thicknesses of doors, while simultaneously not in any way affecting the normal operation of the mortise lock. Thus, through the use of two spindles, with one spindle operating in each of the conventional retractor hubs of a mortise lock, despite variations in door thickness, I obtain that simple communicating lock operation that is required, while also making possible the utilization of stop work for locking or releasing at will the outside retractor hub.

Beyond this, I solve the knob retaining problem by utilizing in my knob assembly a spring retainer for automatically retaining a knob when that knob is applied to the rose assembly while yet permitting release and removal of the knob at will.

As will be clearly evident upon a reading of the specification that follows, my concept of a particular knob and spindle assembly and a mortise lock, contributes a mechanical combination of great value that has been long sought by those skilled in the art.

Referring now to the drawings:

FIG. 1 is a plan view of a conventional mortise lock, with its upper plate removed, to which my invention may be applied.

FIG. 2 is a section taken along line 22 of FIG. 1.

FIG. 3 is a section of the mortise lock of FIG. 1, taken along line 3--3 of that figure and illustrating my invention assembled to the particular mortise lock.

FIG. 4 is an exploded view showing the mortise lock of FIG. 1 and the parts of my invention prior to their assembly to the said lock.

Referring now more particularly to the drawings, and especially to FIGS. 1 and 4, the mortise lock to which my invention may be applied is designated generally by reference letter M. This lock is of standard construction as will be well understood by those skilled in the art. However, it will be well for me to set forth in this specification a few of the features of a mortise lock, so that the functioning and importance of my contribution to the art may be better understood.

Thus, reference numeral indicates the usual front plate of mortise lock M, the plate being attached to the casing of the lock by conventional means. The case comprises a bottom portion 11 having a bottom plate 11a and a top plate 12. Threaded into the top plate 12 is a cylinder lock 13 having a key plug 14 that is actuated in a conventional manner to rotate a cam 15, best shown in FIG. 1. The cylinder 13 is held against release rotation by a standard form of detent 15a.

Mortise lock M includes a deadlocking trigger bolt 16 for deadlocking a latchbolt 17 whenever the door carrying the lock M is moved into coaction with a strike. The latchbolt 17 is retracted by a lever 18, this lever being adapted also to release a deadlocking lever 19 that is controlled by the trigger bolt 16. Lever 18 may be moved in a retracting direction by cam 15 through rotation of the key plug 14 of the cylinder 13, all as is conventional. Lever 18 may also be moved to retract the latchbolt 17 through rotation of an inside retractor hub 20 or an outside retractor hub 21. These two hubs are conventional and are adapted to lie one against the other as is well shown in FIG. 2. A ring 22 surrounds the hubs and holds them in proper operating relation and also against movement away from an accurate aligned position.

It will be noted that outside hub 21 extends in a lateral direction beyond inside retractor hub 20 so as to allow for the forming of a locking slot 23. This locking slot coacts with what the art terms stop work, designated generally by reference numeral 24. This stop work comprises a pair of buttons interconnected by a lever 25. Operation of the buttons brings a locking slide 26 into or out of slot 23 so as to lock or release the outside retractor hub 21. Obviously, when the retractor hub 21 is locked, it cannot rotate to retract the latchbolt. The latchbolt can then only be retracted by the operation of cylinder lock 13.

In locks of the particular class, it is presently customary to utilize What is known as a split spindle. A split spindle comprises two spindle portions adapted to rotate relatively to one another, but with the two spindle portions held against endwise separation. Thus, glancing again at FIG. 2, it would be customary to mount one spindle portion of a split spindle within the opening 30 of retractor hub 21, and the other spindle portion within the retractor hub 20, the two spindle portions rotating relatively to one another along line of separation which coincides with the line of separation 32 of the two hubs. In other words, with the retractor hub 21 locked, the spindle portion within the opening 30 of the hub 21 will be hled against rotation. However, the spindle portion Within the opening 31 of the retractor hub 20 will be free to rotate. Actually, the hub 20 will be at the inside of the lock and the knob secured to the spindle portion that is within the opening 31 will be the inside knob.

The outside knob will be secured to the outer spindle portion that is in the opening 30 of the retractor hub 21, and this knob will be locked and released by the stop work 24 as is standard in the art.

In the conventional construction I have outlined, the inside and outside knobs are held in assembled relation to the spindles, preferably by pinning the outside knob to its spindle portion, and then clamping the inside knob to its spindle portion as by a screw, thereby preventing the outside knob from being pulled outwardly away from the lock. In that earlier construction, it will be obvious that the sole means for holding the outside knob in position will be the clamping screw carried by the inside knob. It will be further understood that in assembling the knobs and spindles, because the two spindles are secured against endwise separation, the line along which they rotate relatively to one another must be set exactly in coincidence with line 32 shown in FIG. 2 between the hubs. Thus, if either spindle portion extends into the opening of a second retractor hub, even though very slightly, the lock will not be operable. Since door thick-' nesses vary rather considerably, and since the attaching of the knobs to the spindles can vary within considerable limits, the difiiculties that can be encountered by the particular construction thus far described are evident.

It will be interesting to note further that even where a lock is adapted for operation at all times by its inside knob and outside knob so that a mere solid one piece spindle will suffice, there are still other inherent difficulties in the conventional construction. Thus, the spindle and knobs must be inserted in exact axial alignment with the openings 30, 31 or of a single opening in a single hub. Otherwise, there will be a binding of the spindle and the hubs, as is readily apparent. Further, it is still necessary for a mere clamping screw or the like on one of the knobs to hold the two knobs and the spindle in assembled operative relation to the lock and door.

I do believe that the basic construction of the prior art and the difiiculties and problems inherent therein will now appear rather apparent.

Referring now more particularly to FIG. 3, the door in which my lock is assembled is designated by reference letter D, the lock M being shown with the cover plate 12 in position at the right of the figure. The base plate 11a of the casing portion 11 is at the left. The inside knob is designated by reference numeral 40, while the outside knob is designated by the reference numeral 41. It will, of course, be appreciated, that if the lock is of that type in which the outside knob 41 may be locked, a cylinder lock 13 will be placed above the knob 41 in a manner well set forth in FIGS. 1 and 4.

Applied against the inside face of the door is a support plate 42, preferably formed of sheet steel. Sleeve bearing 43 is suitably keyed and spun into assembled relation to the plate 42, as at 42b, so as to become an integral part of the plate 42. Rotatably mounted within the sleeve bearing 43 is a sleeve 44, sleeve 44 being held by a snap retainer ring 45 against movement axially outwardly of the sleeve bearing 43 in one direction, the sleeve being shouldered against movement in a reverse direction relatively to the said sleeve bearing. A stub spindle 46 is headed at 47, and slides in a square opening 48 formed in the sleeve 44, for rotation with the sleeve, the headed portion 47 obviously limiting sliding of the spindle in one direction relatively to the sleeve 44. The spindle is bored for a pin 49 which is forced into the bore of the spindle whereby thereafter to be maintained in the position illustrated in FIGS. 3 and 4. A compression spring 50 is positioned between the pin 49 of the spindle 46 and the end surface 51 of sleeve 44, it being the function of the spring to project the stub spindle 46 outwardly of the sleeve 44 toward the limit position shown in FIG. 4. Pin 49 coacts with the hub 20 to limit entry of the spindle 47 into the hub bore 31.

The sleeve bearing 43 and the sleeve 44 are so formed that between the two parts, as probably best seen in FIG. 3, there is a space 52 into which may be fitted a sleeve portion 53 of the knob 40. In other words, the knob may be assembled relatively to the sleeve 44 to lie between that sleeve and the sleeve bearing 43. The knob is formed with an upwardly pressed lug 55, best seen in FIG. 4, this lug being adapted to coact with a slot 56 of the sleeve 44, to key the knob to the sleeve, as is best illustrated in FIG. 3.

For holding the knob 40 assembled to the sleeve 44, I utilize a standard type of retainer 60 maintained in retaining position by a spring 61. The retainer 60 is adapted to enter a retainer slot 62 in the knob sleeve 53 for holding the knob in the assembled position of FIG. 3. When it is desired to remove the inside knob 40, the knob is rotated together with the sleeve 44 and retainer 60, to position the retainer opposite the opening 65 of the sleeve bearings 43, best shown in FIG. 4. A pin will now depress the retainer out of slot 62 and the knob may be removed.

Referring again to FIG. 3, there is shown in section a spring retainer 70 secured to plate 42 This retainer is conventional and is adapted to coact with a decorative rose 71 for holding that rose yieldingly in position to cover the support plate 42 when the support plate is applied to the door.

At the outside of the door, there is mounted a support plate 42a that is identical with support plate 42, except that it is equipped with a pair of internally threaded sleeves 73. These sleeves coact with screws 74 extending from support plate 42 whereby to secure the two support plates in position against the door. It is obvious that since the screws 74 are at the inside of the door, the outside support plate 42a cannot be removed surreptitiously except by extreme force. Preferably, support plate 42a is covered by a decorative rose 7111 similar to the rose 71. Those skilled in the art will appreciate that there are various means for securing decorative rose plates in position and that I have shown only one form that may be utilized. Later, I shall discuss the locating means for screws 74 and sleeves 73.

The outside sleeve bearing 43b forms part of the plate 42a in the same manner as sleeve bearing 43 is integral with plate 42. The outside spindle portion 46a is exactly the same as the inside spindle 46 and operates in the same manner. However, the knob 41, being an outside knob, is preferably pinned as at 78 to the sleeve 44a, sleeve 44a being otherwise exactly the same as sleeve 44. Of course a spring retainer such as retainer 60 may be utilized. The outside sleeve bearing 43b might then have an opening arranged like the retainer manipulating opening 65 in the inside bearing 43, but bearing 43b would have no opening through which the spring retainer could be manipulated when outside hub 41 is in locking position. In this way, it would not be possible to remove the knob 41 when locked against rotation by the stop work.

In utilizing my invention, it is obvious that the two support plates 42 and 42a may be readily assembled to one another, thereby assembling to the lock the sleeve bearings 43 and 43b, the sleeves 44, 44a and the spring pressed spindles 46 and 46a. It will be obvious further that each spindle, because of the presence of the limit pin 49, will be able to enter only into its hub opening 30 or 31. Therefore, regardless of the thickness of the door on which the lock is mounted, no adjustment is necessary since the spindles 46 and 46a cannot be incorrectly ap plied to the lock. If the door is thin, the springs 50 will simply be compressed just a little more than otherwise.

Further, there is no problem of alignment since the hubs themselves, through the spindles 46 and 46a, will compel the proper alignment of the sleeves 44 and 44a. These sleeve will, in turn, compel the proper alignment of the sleeve bearings 43 and 4312. It will further be obvious that there can be no misalignment by screws 74 because the screws 74 used for coacting with the internally threaded sleeves 73, are not wood screws and are not subject to variation as are wood screws. Further, the screws 74 and the threaded sleeves 73 are adapted to coact with openings 80 formed in the lock case cover 12 and further openings 81 formed in the back plate 11a of the case 11. Therefore, there can be no misalignment of any of the parts, so that smooth and accurate operation of the spindles and retractor hubs must result.

With all of the parts set forth in position, the inside knob 40 may be readily applied through its movement between the sleeve 44 and the sleeve bearing 43 as already described, whereupon it is retained in position by spring retainer 60. Knob 41 may be similarly retained or else pinned to its sleeve 44a. It is quite obvious that a spring retainer such as spring retainer 60 will function effectively and cannot become loose in the manner of the prior art clamping screws used generally in connection with mortise locks to retain knobs and spindles.

I believe that the description of my invention I have here set forth makes clear my very considerable contribution to the prior art.

I now claim:

1. In a mortise lock, an inside retractor hub and an outside retractor hub, an inside rose assembly comprising a sleeve bearing, a sleeve rotating on said bearing, a spindle slidable relatively to said sleeve and engaging said sleeve whereby to rotate with said sleeve, a spring pressing said spindle axially of said sleeve into an opening in the inside retractor hub, cooperating means on said spindle and said sleeve preventing disassembly of said spindle from said sleeve while allowing relative movement between said spindle and said sleeve, means limiting the projection of said spindle into said opening in said inside retractor hub, a knob adapted to slide on to said sleeve for rotating said sleeve, and a spring retainer mounted in said sleeve for holding said knob on said sleeve, to gether with an outside rose assembly like said inside rose assembly for coaction with the outside retractor hub, and threaded means extending through said mortise lock for securing said rose assemblies to one another and relatively to said mortise lock and the door in which it is mounted.

2. In a mortise lock, an inside retractor hub and an outside retractor hub, a rose assembly comprising a sleeve bearing, a sleeve rotating on said bearing, a spindle slidable relatively to said sleeve and engaging said sleeve whereby to rotate with said sleeve, a spring pressing said spindle axially of said sleeve into an opening in the inside retractor hub, cooperating means on said spindle and sleeve preventing disassembly of said spindle from said sleeve while allowing relative movement between said spindle and sleeve, a knob adapted to slide on to said sleeve for rotating said sleeve, and a spring retainer mounted in said sleeve for releasably holding said knob on said sleeve.

3. In a mortise lock, an inside retractor hub and an outside retractor hub, an inside rose assembly comprising a sleeve bearing, a sleeve rotating on said bearing, a spindle slidable relatively to said sleeve and engaging said sleeve whereby to rotate with said sleeve, a spring pressing said spindle axially of said sleeve into an opening in the inside retractor hub, cooperating means on said spindle and said sleeve preventing disassembly of said spindle from said sleeve while allowing relative movement between said spindle and sleeve, a knob adapted to slide on to said sleeve for rotating said sleeve, and a spring retainer mounted in said sleeve for holding said knob on said sleeve, together with an outside rose assembly like said inside rose assembly for coaction with the outside retractor hub, and threaded means extending through said mortise lock for securing said rose assemblies to one another and relatively to said mortise lock and the door in which it is mounted.

4. In a mortise lock, an inside retractor hub and an outside retractor hub, an inside rose assembly comprising a rotatable sleeve and a spindle slidable along its longitudinal axis relatively to said sleeve, a spring pressing said spindle axially into an opening in the inside retractor hub, cooperating means on said spindle and rotatable sleeve preventing disassembly of said spindle from said sleeve, means limiting the projection of said spindle into said opening in said hub, a knob adapted to slide on to said assembly for rotating said sleeve and spindle, and a depressible spring retainer mounted in said assembly for holding said knob on said assembly, together with an outside rose assembly like said inside rose assembly for coaction with the outside retractor hub, and threaded means extending through said mortise lock for securing said rose assemblies to one another and relatively to said mortise lock and the door in which it is mounted.

5. In a mortise lock, a thin casing adapted to be mounted within a door mortise, an inside retractor hub and an outside retractor hub, means mounting each of said hubs within said casing, an inside rose assembly comprising a sleeve bearing, a sleeve rotating in said bearing with the outer end of its periphery spaced from the inner surface of said sleeve bearing, means retaining said sleeves within said sleeve bearing, a spindle slidable centrally of said sleeve and engaging said sleeve whereby to rotate with said sleeve, a spring pressing said spindle axially outwardly of said sleeve into an opening in the inside retractor hub when said rose assembly is held against the face of the door with said spindle aligned with the opening in said inside retractor hub, cooperating means on said spindle and sleeve preventing disassembly of said spindle from said sleeve while allowing relative axial movement between said spindle and sleeve, means limiting the projection of said spindle into said opening in said inside retractor hub when said rose assembly is so held, an outside rose assembly like said inside rose assembly for like coaction with the outside retractor hub, threaded means extending between said rose assemblies through openings in said mortise lock casing for securing said rose assemblies to one another and relatively to said mortise lock through pressing said rose assemblies against the inner and outer faces of the door in the mortise of which said thin mortise casing is mounted and with each assembly spaced-from said casing by the door body, a spring retainer on at least one of said sleeves, a knob having a sleevelike shank sufficiently thin to fit about said sleeve and to rotate with said sleeve, a spring pressed retainer carried by said sleeve for locking said knob for rotation with said sleeve, said sleevelike shank of said knob moving between said sleeve bearing and said sleeve, said knob shank having an opening for the entry of said spring pressed retainer whereby to hold said knob against endwise movement off said sleeve.

6. In a mortise lock, an inside retractor hub and an outside retractor hub, an elongated spindle of polygonal cross section, one end of said spindle extending into a polygonal opening in the inside retractor hub whereby to key said spindle to said inside retractor hub, means limiting the projection of said one end of said spindle into said polygonal opening in said inside retractor, an inside rose assembly comprising a sleeve bearing, a sleeve of substantially larger outside diameter than said spindle mounted for rotation in said bearing and surrounding the other end of said spindle, said sleeve having an inner end portion providing a polygonal opening closely fitting and slidably receiving an intermediate portion of said spindle whereby to key said spindle to said sleeve, said sleeve having an outer end portion of substantially larger inside diameter than said polygonal opening through said inner end portion, said other end of said spindle extending through said polygonal opening in said inner end portion into said outer end portion of substantially larger inside diameter, spring means extending between said sleeve and spindle for pressing said spindle axially of said sleeve into said polygonal opening in said inside retractor hub, means on the other end of said spindle limiting outward movement of said spindle relatively to said sleeve While allowing inward movement of said spindle relatively to said sleeve through yielding of said spring means, a knob having a cylindrical shank portion slidably received on the outer surface of said sleeve, spring pressed retainer means mounted within said sleeve in said outer end portion of substantially larger diameter, said spring pressed retainer means having a knob retaining dog projecting through an opening in said sleeve, and an opening in said shank of said knob receiving said dog portion of said spring pressed retainer to lock said knob to said sleeve.

7. In a mortise lock, an inside retractor hub and an outside retractor hub, a knob assembly comprising a sleeve bearing, a sleeve rotating in said bearing, a spindle slidable in an axial direction in said sleeve and engaging said sleeve whereby to rotate with said sleeve, said spindle extending into an opening in the inside retractor hub, means limiting the projection of said spindle into said opening in said hub, a spring extending between said limiting means and said sleeve for pressing said spindle axially of said sleeve into said opening in the inside retractor hub, a knob including a sleeve portion supported on the outer surface of said rotating sleeve, and knob retainer means mounted in position within said rotating sleeve and allowing clearance for the axial sliding of the spindle in said sleeve, said knob retainer means having a portion engaging in openings in the rotating sleeve and sleeve portion of :the knob to lock said knob to said sleeve.

References Cited by the Examiner UNITED STATES PATENTS 205,204 6/78 Niles et a1. 292l69 305,426 9/84 Clark 292348 1,621,174 3/27 Schlage 292353 2,238,314 4/41 Falk 292337 2,694,309 11/54 Cerf 70147 ALBERT H. KAMPE, Primary Examiner.

Claims (1)

1. 7. IN A MORTISE LOCK, AN INSIDE RETRACTOR HUB AND AN OUTSIDE RETRACTOR HUB, A KNOB ASSEMBLY COMPRISING A SLEEVE BEARING, A SLEEVE ROTATING IN SAID BEARING, A SPINDLE SLIDABLE IN AN AXIAL DIRECTION IN SAID SLEEVE AND ENGGING SAID SLEEVE WBEREY TO ROTATE SAID SLEEVE, SAID SPINDLE EXTENDING INTO AN OPENING IN THE INSIDE RETRACTOR HUB, MEANS LIMITING THE PROJECTION OF SAID SPINDLE INTO SAID OPENING IN SAID HUB, A SPRING EXTENDING BETWEEN SAID LIMITING MEANS AND SAID SLEEVE FOR PRESSING SAID SPINDLE AXIALLY OF SAID SLEEVE INTO SAID OPENING IN THE INSIDE RETRACTOR HUB, A KNOB INCLUDING A SLEEVE PORTION SUPPORTED ON THE OUTER SURFACE OF SAID ROTATING SLEEVE, AND KNOB RETAINER MEANS MOUNTED IN POSITION WITHIN SAID ROTATING SLEEVE AND ALLOWING CLEARNACE FOR THE AXIAL SLIDING OF THE SPINDLE IN SAID SLEEVE, SAID KNOB RETAINER MEANS HAVING A PORTION ENGAGING IN OPENINGS IN THE ROTATING SLEEVE AND SLEEVE PORTION OF THE KNOB TO LOCK SAID KNOB TO SAID SLEEVE.

Images