GB2271147A - Lockable door set assembly - Google Patents

Abstract

In a door set assembly a turn bar 43 driven from a lock cylinder 46 carries a cam 91 which can urge balls 92 through apertures in a sleeve 34 secured to the knob 31 to engage apertures in housing 38 to lock the knob. The cam is profiled to provide an arc of movement in which the ball is held in the locked position. <IMAGE>

Description

KEY-IN KNOB DOOR ASSEMBLY WITH NOTCHED TURN BAR SELF-ALIGNING BUTTON AND INSTALLATION CATCHES Prior lock constructions have included arrangements for disengaging the lock cylinder plug from the turn bar including insertion of a tool when disengagement is desired. Exposed apertures have been proposed to receive such tools (U.S. Patent Nos. 2,008,668, 2,027,731, 2,079,588, 3,019,633). Door sets including two such assembled have been proposed to be brought together from either side of a door and held in permanent engagement using interengaging prongs mounted on the subassemblies (U.S.

Patent Nos. 671,943, 2,726,891, 2,929,649, 3,048,436, 3,853,341). U.S. Patent No. 3,048,436 states that subassemblies can be separated after permanent engagement using a strong pulling force which may cause damage.

Security of such a lock is compromised.

Broadly, the present invention comprises two door se- subassemblies having an interior turn button mounted in a sleeve and an outside cylinder lock with said button and lock interconnected by a turn bar. Subassemblies are held temporarily together by flexible catches, friction or otherwise during initial assembly pending permanent and secure engagement to the door using fasteners. The door set includes a cylinder plug which is separated from the turn bar using a tool insertable through an aperture normally concealed by a knob.

It is also advantageous to arrange that the turn button is initially properly positioned during factory assembly with a frangible projection through an alignment hole in the sleeve.

There will now be described an example of a door set in accordance with the invention. The description which is given by way of example only is to be read with reference to the drawings in which: Fig. 1 is a top view of the door set mechanism; Fig. 2 is an elevational view of the mechanism; Fig. 3 is an end view of the outside subassembly; Fig. 3a is a sectional view along line 3a-3a of Fig. 3; Fig. 4 is a plan view of the sleeve and turn button; Fig. 4a is a sectional view taken along line 4a da of Fig. 4; Fig. 5 is a plan view showing turn bar movement with a tool; Fig. - is a plan view showing subassembly halves interccnnected with the right half moving to the left;; Fig. 7 is a similar view of Fig. 6 with the right nalf roving to the right; Fig. 3 is an enlarged sectional view taken along line 3-8 of Fig. ; Fig. 9 is a partial view similar to Fig 1 showing turn bar turned 90; Fig. 10 is a sectional view taken along line 1010 of Fig. 9; Fig. 11 is a view similar to Fig. 10 in which the bar and cam are turned 900 clockwise; Fig. place are partial sectional views showing the lock position and the cam thereafter rotated through angle "a"; Fig. 12 is a sectional view along line 13-13 of Fig. lla; Fig. 12a is a view in which the sleeve, cam and turn bar are turned from the Fig. 10 position clockwise about 70 ;; Fig. 13 is a perspective view of the sleeve.

Fig. 14 is an elevational view of an alternative spring projection and mount; Fig. 14a is a plan view of the alternative spring projection; and Fig. 14b is a side elevational view.

fn Figs. 1 and 2, knob door set assembly 10 includes inside subassembly 11 and outside subassembly 12.

Inside subassembly 11 includes inside knob 13 with turn button hole 16, inside boss 17 or rosette, inside sleeve 18, inside spring driver 21, spring 19 and inside housing 22 including housing plate 22a for engagement against inside door surface 20a of door 20 when the subassemblies are finally installed.

Outside subassembly 12 includes outside knob 31 with lock opening 32, outside boss or rosette 33, outside sleeve 34, outside spring driver 36, spring 37 and outside housing 38 including housing plate 38a for engagement against outside surface 20b of door 20 when finally installed.

Also shown in Figs. 1 and 2 are turn button 40 including cap 41 positioned to surround a portion of turn button adapter 42, turn bar 43, cylinder lock 46, cylinder plug 46a having slot 46b and fasteners 47a, 47b which are threaded into outside rigid threaded plate projections 50a, 50into accomplish permanent installation.

Turning to Fig. 3, outside housing plate 38a has two flexible spring projections 52, 53 mounted by staking in plate recesses 54, 55 in plate 38a of plate housing 38.

Flexible projection 52 includes foot 52a, leg 52b and Ushaped head 52c. Inside plate 22 has rigid grooved projections 57, 58 formed therein which projections 57, 58 each have five (5) stop surfaces 57a-e, 58a-e for engaging heads 52c, 53c to hold plates 22, 38 in selected spaced apart distances depending on the thickness of door 20. Door width may, for example, vary from 1-1/4 to 1-3/4 inches.

When subassemblies 11 and 12 are first inserted through door opening 20c (Fig. 1) flexible projections 52, 53 and corresponding grooved rigid projections 57, 58 engage as heads 52c, 53c ride down stepped and spaced-apart stop surfaces 57a-e, 58a-e (see Fig. 3a). In one of these positions plates 22, 38 are spaced for engagement or near engagement with door surfaces 20a, 20b. As further installation continues the two subassemblies are acted up by forces of gravity, vibration of the installer's tool engagement and other forces which could cause either or both subassemblies 11 or 12 to fall to the floor absent the above-described restrain.The engagement of heads 52c, 53c with first stops 57e, 58e as the subassemblies separate during installation and plates 22, 38 move slightly away from the door surfaces 20a, 20b, the resistance forces to permit heads 52c, 53c to pass stops 57e, 58e are light and are in the magnitude of a pound or less. This arrangement provides only for temporary engagement of subassemblies 11 and 12 until fasteners 47a, 47b are in place.

Figs. 4 and 4a show button adaptor 42 including body alignment projection 61 and inside sleeve aperture 62 through which projection 61 which projects from button throat 42a when assembled at the factory and during initial assembly. The insertion of the projection 61 in the sleeve aperture 62 assures that rectangular button recess 63 is oriented properly to receive rectangular turn bar 43 during assembly of the subassemblies tri,12. After assembly rotation of button 40 s readil allowed by flexing of projection 61 as shown in Fig. 4a in dashed lines (Fig. 8).

In Fi. 5, turn bar 43 is shown being translated away (arrow B) from the cylinder lock 46 to permit removal and replacement of the cylinder plug 46a. An aperture 70, having a substantial width, such as 3/8 inch and having a substantial length, such a 3/4 inch, in inside sleeve 18 permits insertion of a common tool (T), such as a household screw driver, where turn bar notches 71 serve to allow translation of bar 43 against tension spring (not shown) to allow bar end 43a to move out of slot 46c in lock plug 46a (see also Fig. 1). Aperture 70 is normally concealed from view by knob 13 and/or boss 27 which are removable to permit tool(s) insertion. Once turn bar 43 is so withdrawn the lock plug 46a and lock 46 can be readily removed for replacement with a new lock plug.Also shown in Fig. 5 is an alignment projection 61A which is the same height of projection 61; however, projection 61A is made of a different material or with a modified thickness so that it snaps off during operation after assembly, leaving base portion 61b. Thus, projections 61, 61A do not interfere with regular door set operation after assembly is complete.

Turning to Figs. 6-8, an alternative embodiment is shown in which inside sleeve 18a has circular end plate 80 secured to it. Plate 80 has rectangular opening 81 for receiving rectangular spindle 82. Spindle 82 has top and bottom ridge projections 82a, 82b. After spindle 82 passes through opening 81 it passes through adjacent flex friction washer 84 which has opening 86 into which are projected upper and lower washer tongues 84a, 84b which ride on projections 82a, 82b and which resist the withdrawal of spindle 82 since washer tongues 84a, 84b tend to create friction or am into opening 81 or both (see Fig. 8).

In another a ternative embodiment, lock assembly 10' is unlocked sy operating the key (not shown) to place cylinder lock 46' in a condition in which turn bar 43 is positioned in its vertical position in its lock position (Figs. 11 and lla). 3ince turn bar 43 is inserted in rectangular opening 90 in locking cam 91, turn bar 43 and cam 90 turn together at all times. As shown in Fig. 10, the unlock position, lock balls 92, 93 are positioned adjacent but opposite body cavities 38b', 38c'. Cam 91 includes cam body 90a and cam ball-engaging recesses 96, 97 and cam profile surfaces 96a, 97a. Also shown in Fig. 9 is spring driver 36, housing 38' and sleeve 34.

Wh-en key operation places cylinder lock 46' in a condition in which turn bar 43 and locking cam 91 are turned 90" clockwise, from an unlocked position as viewed in Fig.

10 to a locked position of Fig. 11, balls 92, 93 are driven horizontally and outwardly into cavities 38b', 38c' by cam profile surfaces 96a, 97a which deliminate in part ball recesses 96, 97 to place the lock assembly 10 in the lock position (see also Fig. 11). Sleeve 34 does not turn during such key operation.

With respect to Figs. lla-c, the profile cam surface 97a includes four (4) segments: S1 to S2; S2 to S3 to S4; and 54 to S5. In the lock portion, ball 92 nests in segments S1, S2 and as cam 91 rotates clockwise, ball 92 stays equidistant from profile cam surface 97a of cam 91 through arcuate segment rotation equal to the length of segment S2-S3 and thereafter ball 92 and cam surface 97a increase in spacing, all to allow ball 92 to move further out of cavity 38c. The tolerances and clearances among ball 92, cavity 38c and cam 91 are such that ball 92, during the fully locked position, can move horizontally about .010 inch.Figure lla shows the fully locked position; Fig. llb shows cam 91 turned to reduce angle "a" of Fig. lla to "b"; and Fig. llc shows the cam turned to reduce such angle to zero. Fig. 12 is a sectional view showing ball 92 adjacent profile surface 97a of ball pocket 90b. Angle "a" is preferably about 30-35".

Due to the clearance and tolerance among parts of assembly 10' vibration and tampering can cause cam 91 to turn up to 15-20 even when the lock is in the lock position. Since balls 92, 93 are held n their respective cavities during the initial 30-35 of cam 91 rotation, the lock maintains its integrity even when vibrated or torqued by tampering to the maximum arc allowed by clearance and tolerance of such parts.

When lock assembly 10' is in its unlock position knob 31 is free to rotate along with sleeve 34 clockwise (as viewed from the outside of the assembly) about 80" with balls 92, 93 captured in sleeve apertures 34a, 34b (Fig.

12a). Fig. 13 shows sleeve aperture 34a. Sleeve aperture 34b' is positioned 1800 opposite to aperture 34a' (not shown). When the door operator releases knob 31, spring 37 causes sleeve 34 to rotate to position itself as shown in Fig. 10.

Turning to Figs. 14, 14a and 14b there is shown a spring mount alternative to that shown in Fig. 3a in which outside housing 72 has channel 72a shaped td receive spring projection leg 73b of spring projection 73. Spring projection leg 73b comprises snap-in anchor portion 75 including side fingers 75a, 75b; center finger 75c and flexible detent 75d. Also shown is U-shaped projection head 73c; inside housing 76; grooved projection 77 and stop surfaces 77a-d. To assemble spring projection 73 into housing 72, anchor portion 75 is inserted into channel 72a causing detent 72- to flatten until it enters housing chamber 72b where it springs to lock position shown in Fig.

4.

Claims (12)

1. In a door set having an outside subassembly including a stationary housing with a passageway therethrough and a ball-recei-:ing cavity therein, a turn bar rotatable through a selected turning range; a cam connected to and rotatable with the bar, the improvement comprising a sleeve surrounding the cam and rotatable within the housing under a spring return force; a slot opening in the sleeve normally positionable due to such spring force opposite the ball-receiving cavity; a ball positioned in the slot opening and carried by the sleeve as it turns; and a cam pocket with a can surface comprising part of the cam, said surface having a curved arcuate segment which surface when opposite said ball prevents such ball from moving out of ball- receiving cavity in the stationary housing whereby selected rotation of the cam moves the ball through the slot into the housing cavity to lock the ball and rotation of the cam an the opposite iirction through such arcate segment is insufficient to allow the ball to commence moving out of the cavity.

2. The door set of claim 1 in which the curved segment arc is larger than the arc of rotation movement or the cam en caused to rotate to the full extent of Fts clearance and tolerance movement when locked and subjected to vibration.

3 A door set constructed and arranged substantially as hereinbefore described with reference to and as shown in the drawings.

4. A door set having two subassemblies each having housing plates for permanent assembly in which such housing plates are located a predetermined distance apart and with a cylinder lock in one subassembly comprising a) engagement means for temporarily engaging said subassemblies during installation, said engagement means in turn comprising i) a first projection on an assembly which projection has a stop means at its end; ii) a second projection on the other assembly which projection has a stop means at its end; said stop means being engageable to prevent separation until a predetermined light force separates them and such stop means being spaced apart prior to such separation a mredeter.-::ned distance such that the housing prates are spaced the same as or greater than the distance apart during said temporary engagement than after final installation.

5. The door set of claim 4 in which the first projection is rigid and the second projection is flexible.

6. The door set of claim 4 in which the secured projection has an anchor portion which snap-fits into the other assembly.

7. The door set of claim 5 in which the rigid projection has a plurality of stops to provide varying separation distances of the plates while the first and second projections are engaged.

8. The door set of claim 4 in which one subassembly carries a notched turn bar and one subassembly has a sleeve with a large aperture normally covered by a removable subassembly part which aperture is large enough to accommodate a household tool insertion to engage and translate the notched turn bar.

9. The door set of claim 4 in which one subassembly has a turn button with a configured recess for receiving a configured turn bar end with the turn button adaptor positioned in a slot apertured sleeve with such utton daptor n a orientation determined by a flexible mutton projection projecting into such slot whereby the projection orients the button adaptor for assembly of subassemblies.

10. The door set of claim 3 in which the button projection flexes after assembly to permit door set operation thereafter.

11. The door set of claim 8 in which the bottom projection after assembly is sheared off to permit door set operation thereafter.

12. R door set constructed and arranged substantially as ;-erernberore described with reference to and as shown in the drawings.