US3363440A

US3363440A - Automatically-retractive key holder

Info

Publication number: US3363440A
Authority: US
Inventors: Elden L Rivers
Original assignee: Elden L. Rivers
Current assignee: ELDEN L RIVERS
Priority date: 1966-01-10
Filing date: 1966-01-10
Publication date: 1968-01-16
Anticipated expiration: 1985-01-16

Description

E. 1.. RIVERS 3,363,440

Jan. 16, 1968 AUTOMATICALLY-RETRACTIVE KEY HOLDER 2 Sheets-Shem 1 Filed Jan. 10, 1966 9 a W v 5 I V/ n 6 a.

INVENTOk Elden L. Rivers ATTORNEYS Jan. 16, 1968 Filed Jan. 10, 1966 E. L. RIVERS 3,363,440

AUTOMATICALLY-RETRACTIVE KEY HOLDER 2 Sheets-Sheet 2 INVENTOR.

EIdenL. Rivers zwla zgi ATTORNEYS United States Patent C) 3,363,440 AUTOMATICALLY-RETRACTIVE KEY HOLDER Elden L. Rivers, 1504 Llano St.,

Santa Fe, N. Mex. 87501 Filed Jan. 10, 1966, Ser. No. 519,587 9 Claims. (CI. 70-414) ABSTRACT OF THE DISCLOSURE An automatically-retractive key holder having a spring pressed, slotted plunger which is disposed on each side of the key and a cylindrical housing in which the larger end of the key is mounted by set screws. The plunger bears against the lock, to retract the key, but is automatically held in retracted position by a circumferentially turnable, exterior detent journaled on the stem of the housing and having inwardly extending pins which cooperate with notches formed in the plunger, so that the key may be inserted and turned by the exterior, turnable detent, to automatically lock the plunger and prevent the full spring pressure from bearing against the lock, while the key is in on position. The key holder may be turned by the exterior detent, to unlock the key and automatically release the plunger, so that the key is automatically ejected from the lock.

This invention relates to the conventional practice of utilizing keys for the operational regulation of electrical control locks, and more particularly to the use of keys with cylinder locks of the type and general construction extensively provided for control of ignition and starter circuits of automobiles. As such, a principal object of the invention is to provide a novel and improved key holder for an individual key to facilitate its conventional use with an ignition circuit lock and, at the same time, to positively assure removal of the key from the associated ignition circuit lock whenever the circuit, or circuits, controlled by the lock are interrupted, as when the key is turned to the OE position.

A further object of the invention is to provide a novel and improved key holder which permits customary operative manipulation of a key, carried on the holder, in its associated lock, and in addition thereto, functions to extract the key from the lock synchronously with the turning of the key to an ofi key position of the lock.

A further object of the invention is to provide a novel and improved key holder for conventional lock keys that is suited for convenient, interchangeable, operative association with individual keys of diverse size, confirmation, and particularity.

A further object of the invention is to provide a novel and improved holder for conventional lock keys that applies natural and normal key manipulations in a lock to effect, through an individual key attached to the holder, the usual lock operating functions of the key and also positive retraction of the key from a lock responsive to appropriate adjustments of the respective components.

A further object of the invention is to provide a novel and improved key holder that develops, through insertion of a key mounted thereon into a lock, the potential for spontaneous retraction of the key from the lock at only appropriate off positions of the lock, and the lock and key are subject only to the ordinary and usual movements, strains and frictions of the key within the lock at other than at the off position.

A further object of the invention is toprovide a novel and improved key holder that develops, through lock insertion of an individual key on the holder, the potential for automatic key retraction from the lock at a selected appropriate off position of the lock; that applies a simple and natural manipulation to effect first, ordinary retention of the key in the lock without imposing upon the lock any stress other than the normal strains and frictions of lock and key coaction, and responds to a simple and natural manipulation to position and release the key therefrom.

A further object of the invention is to provide a novel and improved automatically retractible key holder for conventional lock keys that is simple of construction, expedient and economical of production, facile of operative conjunction with diverse key components, convenient of natural operative manipulations, durable in protracted repetitious use, compact and acceptably moderate in bulk, and positive and efiicient in attainment of the ends for which designed.

With the foregoing and other objects in view, the invention consists in the construction, arrangements, and operative combinations of elements and features as hereinafter set forth, pointed out in the appended claims, and illustrated by the accompanying drawings, in which:

FIGURE 1 is a side elevational view of a preferred practical embodiment of a key holder according to the invention, as organized ready for use, prior to the association of a key therewith, and with a fragment of a key chain connected thereto, illustrative of one mode of use of the holder.

FIGURE 2 is a top plan view of the arrangement according to FIG. 1, but with a fragment being broken away and in section, to show internal constructions thereof.

FIGURE 3 is a longitudinal sectional view, as taken substantially from the indicated line 3-3 at FIG. 2.

FIGURE 4 is a sectional view, as taken transversely through and substantially on the indicated line 4-4 at FIG. 3, but on an enlarged scale.

FIGURE 5 is a sectional view, taken transversely through and substantially on the indicated line 5-5 at FIG. 3, but on an enlarged scale.

FIGURE 6 is a transverse, sectional view, taken substantially on the indicated line 6-6 at FIG. 3, but on an enlarged scale.

FIGURE 7 is a side elevational view showing the organization according to FIG. 1 completed in attachment to a key, as shown with the associated fragmentary sectional representation of a cylindrical lock.

FIGURE 8 is a transverse, sectional view, as taken from the indicated line 8-8 at FIG. 7, but on an enlarged scale.

FIGURE 9 is a side elevational view similar to the showing at FIG. 7, but with the key being inserted into the lock, as for actuation thereof, and with the unit being rotated through an arc of approximately 60.

FIGURE 10 is a transverse, sectional view, as taken from the indicated line 10-10 at FIG. 9, but on enlarged scale.

FIG. 11 is an isometric exploded view of the components constituting the key holder illustrated at FIG. 1.

FIGURE 12 is an isometric view of one of the components shown at FIG. 11, as taken from the indicated arrow 12 at FIG. 11, to show portions hidden in FIG. 11.

FIGURE 13 is a side elevational view of a second embodiment of the key holder, having a key mounted therein.

FIGURE 14 is a top plan view of the arrangement according to FIG. 13, but without a key in place.

FIGURE 15 is a longitudinal sectional view, as taken substantially from the indicated line 15-15 at FIG. 14.

FIGURE 16 is a transverse sectional view through the indicated line 16-16 at FIG. 13, but on an enlarged scale.

Reliance upon the key operated cylinder locks for selective control of automobile ignition and starter circuits, either or both, is so well established and well nigh universal as to obviate occasion for extended description of the instrumentalities involved. As conventionally provided, the closing of the circuits by the lock requires a partial rotation of the lock cylinder by means of a key inserted and retained in the lock, while the circuits are closed, to effect the powering of the automobile. Interruption and opening of the circuits, as to shut off the vehicle, with attendant protection against unauthorized availment of the vehicle, is effected by reverse rotation of the lock to an initial off position, where the key may be removed from the cylinder, Manifestly, the protection afforded by lock control of the circuits is vitiated by failure to extract the key, when the lock is turned off to open the circuits and to free the key. When the key is left in the lock, it is an invitation for unauthorized appropriation of the vehicle. Also, the leaving of a key in the lock frequently creates a problem, where the doors of the vehicle accidentally are closed and locked with the only access key being the ignition key within the vehicle. To avoid such circumstances, which are usually inadvertent, the present invention contemplates a key holder featuring automatic retraction of the key upon rotation and turning off of the circuits, the same creating an incident of intentional key manipulation requiring removal and retention of the key by the possessor. The present invention is further directed to the provision of novel and improved means for accomplishing such automatic key retraction without impairing or limiting the facility of customary key actuation.

Obviously suited to realize its purposes and advantages in application to key and lock combinations of diverse particularly, the typical embodiments of the invention illustrated and hereinafter described are exemplified as suited for and in operative association with a conventional cylinder lock L and key K arrangement, such as is generally used for control of the ignition and starter circuits of automobiles.

The essential features of such arrangement are represented to the extent necessary for an understanding of the invention at FIGS. 7 and 9 as the usual cylinder 20 formed with a key slot 21 exposing the ends of tumblers 22 and an escutcheon 23 surrounding the accessible end of the key slot. The flat key K, adapted to engage and rotate this cylinder through a selected arc, includes a laterally expanded head 24 and a blade 25 extendible therefrom which is reciprocable in the key slot 21 with a contoured edge moving across the exposed ends of the tumblers to final positions of operative registration therewith, in customary manner and with attendant known effect.

Sized and conformed for natural and convenient human manipulation, the improved key holder H is a unitary, multi-element assembly characterized by a housing component 33 of a general axially symmetrical form, and an annular detent 31 coaxially complementing this housing 30 in rotatable, adjustable attachment thereto.

Formed in any feasible manner from strong, rigid material, the housing 30 is constituted as an elongated unit having a transversely circular, nosed head 32 at one end and a socketed, cylindrical stem 33 coaxially projecting in a much reduced relative diameter from abruptly shouldered relation with the major diameter end of said head. Closed at its end, remote from the head 32, the stem 33 may be there provided with an eye 34, or the like, for convenience of attachment to other facilities, such as a chain, as illustrated at FIG. I. From said end closure, the said stem 33 confines an axially centered, smooth, straight bore 35 of uniform diameter which extends to traverse the head 32 and open at the nosed end thereof.

A relatively narrower, parallel walled notch 36 deeply and diametrically interrupts the nosed end of said head and intersects the bore 35. Appropriately sized in the disposition set forth, it is the function of the notch 36 to embracingly receive the flat head 24 of the key K intended for association with the holder, to mount the key with its blade 25 directed longitudinally and outwardly from and along the axis of the housing component 33 in position for use application to the lock L. A pair of spaced apart screws 37 are threadedly accommodated through the head 32, at each side of the notch 36, to provide positive engagement of the head 24 of the key received in the notch, as will serve to securely clamp and hold the same in bearing contact with the notch wall portions opposed to the screws, at both sides of the axial bore 35 which longitudinally intersects the sides of the notch.

As so organized, the housing component 30 is adapted to receive and operatively mount any selected key of appropriate type with facility of key interchange, through simple manipulation of the screws 37 which, when their heads are recessed within the material of the component, as in FIG. 8, offer no adverse disruption to the exterior conformation of the component, It will be noted that the notch 36 will be normally deeper than a key head 24 and that a simple depth adjustment of the key head into the notch, as in a manner hereinafter described, will be maintained by the tightening of the lock screws 37, these screws being provided with sharp points or annular ridges which effectively bite into the head of the key to anchor it in position.

A cylindrical plunger 38 is mounted in the bore 35 with a freely reciprocable fit and is biased outwardly of the bore to normally project beyond the nosed end of the head 32 by an expansive spring 39 housed within the stem 33 between the closed end of said stem and the end of the plunger thereto opposed. In a length much exceeding that of the head 32, the plunger 38 is longitudinally and diametrically bisected by a slot 40 opening from the outward end thereof beyond the nosed end of the head and extending to a position near the inner end adjacent to the spring 39, thus forming a \pair of legs 38 interconnected by a crotch at the said inner end. This slot 40 is formed with a width and disposition registrable with the notch 36 diametrically of the head 32, and hence the plunger legs 38', when extended from the housing, are suited to slidably embrace the head 24 and a substantial reach of the blade 25 of key K engaged in said notch, as above set forth.

Rotation of the plunger 38 within the head 32 is naturally inhibited by a key within the notch 36 and in slot 40. It is further prevented by a longitudinally disposed spline 41 on each leg, which extends into a registering slot 42 in that portion of the bore 35 which lies within the head 32. The positioning and length of the ribs 41 on the plunger legs 38' is such as to be fully engaged in their slotways 42 when the plunger is fully retracted against the bias of the spring 39, but also with a portion of each rib being within its slotways 42, when the plunger is fully extended, as to the position shown at FIG. 1.

The plunger 38, free to reciprocate axially of the housing within the bore and urged outwardly therefrom by the bias of the spring 39, is limited in its outward movement by the ends of a pair of diametrically opposed pin screws 43 abutting against its crotch, the pin screws 43 normally lying in the plane of the notch 36 and slot 40 being mounted upon the detent 31 to extend through the stem and project into the bore 35, as hereinafter further described. The length of the plunger and the extent of its reciprocation into the bore is necessarily correlated with the effective length of the blade of a key mounted in the notch 36. The outward limit of the plunger legs movement is at a position where the legs cover all but the tip of the blade 25 of the associated key, while the retractive limit against the bias of the spring must be such as to expose the effective length of the key blade for insertion into the lock, such limits of movement being clearly shown at FIGS. 7 and 9. To easily accommodate the various types of common keys in use, with blades of various length and head portions of various forms, the plunger legs 38 are provided with break-off extensions 44 and 44', shown at FIGS. 1, 2, 3 and 11, while FIGS. 7 and 9 show the organization with the extensions removed.

Full engagement of the key blade 25 within and for operation of the lock cylinder is resisted but by moderate pressure of the spring 33 and is readily attained by slight manual effort to push the key into the lock to its operative position. The plunger 38 is retracted into the housing bore 35, but maintains an engagement with the escutcheon 23 to establish the relationships represented by FIG. 9, wherein turning of the key in response to angular manipulations of the housing operates the lock in the customary manner and latches the key blade within the lock in resistance to the retractive influence of the spring 28 transmitted by the plunger as end engaged against the escutcheon. Obviously, when the key is reversely turned by the component 21 and is thereby freed for retraction, the compressed spring 26 acts to extend the plunger from the housing to thereby withdraw the key from the lock until at the limit of its outward travel range the plunger is relieved of the pressure urging it to contact with the escutcheon.

Functionally complete and operable as above explained, the organization thus far described has been found generally unsatisfactory. In the first place, it effects a wear and ultimate damage to the operating edge of the key blade and to the tumblers 22 which it contacts, since, if the elements were thus cooperating, as in FIG. 7, a maintained extractive pressure deriving from the spring 28 is imposed on the lock retained key to enhance the stresses and frictions of key edge and tumbler interengagement. Moreover, the organization thus far described simply cannot be used with ignition locks of a type which are especially designed to permit emergency removal of the key at the on positions, as well as normal removal at the off positions, for it will eject the key from such a lock at the on position. Even with locks of this type, it is almost a universal practice to leave the key in the lock when the motor vehicle is being operated.

To avoid this condition, the present invention provides for an interlock means between the plunger and the housing 30 which holds the plunger in the housing and eliminates the retractive pressure on the key during retention of the key blade in its operating coaction within the lock. As a further feature of the invention, the interlock means engages the plunger in the lock as the key is inserted and turned to the on position of the lock, and the interlock is automatically released whenever the key is turned towards the off position to be disengaged from the lock, all in an ordinary manner and without any special manipulations on the part of the operator.

This interlock means, which includes the pin screws 43 is carried upon the annular detent 31, and is functionally a latch rotatably adjustable relative to the housing 30 to alternately lock the plunger 38 in its retracted, spring compressing position when rotated in one direction, and to release the same when rotated in the opposite direction. The detent 31, having a major diameter the same as the head 32-, is formed as an open end thirnble suited to coaxially, revolvably and telescopically embrace the stem 33 in abutting registration of its greater end with the shoulder conjunction of the head 32 and stem 33. Its exterior conformation is convenient of human grasp and manipulation and is characterized desirably, by opposed flats slightly convergent both chordally and axially.

Otherwise freely journaled in its mounting upon the housing stem 33, the detent 31 is retained on the stem for limited relative angular rotational displacement and held against relative axial shift by the pin screws 43 which are held in diametrically opposed threaded sockets 46 at the major diameter portion of the detent adjacent to the plane of contact with the head 32. The pin screws are appropriately head recessed in their sockets 46 and their inner, unthreaded pin ends 43 project within, through and beyond diametrically opposed, circumferentially narrow, relatively short slot openings 47 in the stem 33, as clearly shown at FIG. 5. The arcuate extent of these slot openings is sufficient only to provide for limited relative angular displacement of the detent on the housing, as hereinafter described.

A corresponding end of each slot opening is registered with and overlies the inner end of the slot 40 of the plunger 33, and the pin ends 43' normally project into this slot and abut against the crotch of the plunger, to limit the outward movement of the plunger 38, as hereinbefore described. Also, the projection of the pin ends 43 into the slot limits the relative axial play of the detent 31 about the stem, and their coaction with the slot of the rotationally fixed plunger 38 normally produces a relative angular immobilization of the components, so that the housing 30 and detent 31 operatively and alike reflect and apply manipulations directed to actuation of the associated key.

Angular rotative adjustment of the detent 31 about the housing is afforded by an indent 48 in each leg 38' of the plunger at diametrically opposite edges of the legs and at a longitudinal position on the legs which registers with the pin ends 43 when the plunger is at its fully retracted position within the bore 35. With the indents in such registration, the detent may be rotated about the stem through a small arcuate displacement to place the pin ends into the indents, as in the manner clearly shown at FIG. 10, and this rotation effectively locks the plunger in a retracted position. This locking action may be rendered more eflective by aligning the threaded sockets 46 at a small offset from a radial position, as shown at FIGS. 5 and 10.

Although the relative angular rotation of the detent about the housing is inherently limited by the movement of the pin ends in the stem slot openings 47 from a normal position within the plunger slot to a locking position within the indents 48, the detent and housing are preferably formed with a stop means between their contacting shoulder surfaces to avoid subjecting the pin ends to undue pressure. As clearly illustrated at FIG. 6, 11 and 12, the stop means comprise a pair of diametrically opposed radial lug segments 49 on the stem 33 at the shoulder surface of the housing and a like pair of complementary diametrically opposed radial sockets 50 in the opposing shoulder surface of the detent 31. When interengaged, the lugs 49 fit into their sockets 50 with the circumferential extent of the sockets exceeding that of the lugs to an extent sufiicient to provide relative rotative freedom of the detent on the housing through an are which enables the pin ends 43 to move from the plunger slot 40 and to the indents 48 to seat thereon, as in the manner clearly indicated at FIG. 10.

Given a lock arrangement operable to close circuits controlled by rotation of the key in the lock cylinder in a certain direction, represented at FIG. 9 to be clockwise, the stem openings 47 and clearance of the lugs 49 in their sockets 50 are disposed to produce such rotation of the detent about the stem 33. In this manner, an angular shift of the detent 31 relative to the housing in the direction of the key turn is possible whenever the plunger is sufficiently retracted as to place the indents 48 in line with the ends 43' of the pin screws. The shift of these ends 43 from the slot 40 and into the indents 48 effects a latching of the plunger 38 in its retracted position.

This latching action may be used to properly position the key upon the holder. First, the length of the plunger 38 is approximately adjusted for a given key by removing one or both of the leg extensions 44 and 44', as may be necessary. Next, the key is fully inserted into its lock and the lock is turned sufficiently to hold the key therein. Next, the holder is mounted over the head 24 of the key with the plunger 38 retracted and latched. Finally, when the ends of the plunger firmly contact the escutcheon 23 of the lock, the set screws 37 in the head are tightened 7 againstthe head 24 until the key is firmly held in the notch.

The holder and key afiixed thereto are then ready for use in accordance with the principles of the invention. When the key is fully inserted into the lock, as at its normal off position, the plunger engages the escutcheon and is thereby pushed into the bore 35 to a position where the indents 43 are adjacent to the pin screws 43. Turning the key clockwise by grasping the detent produces, in addition to turning the key to its on position, a rotation of the detent upon the housing to shift the pin ends 33' into the indents 48 and latch the plunger. The plunger held by the pins 43 does not press against the escutcheon to produce abnormal stresses on the key blade and lock tumblers. Also, the key will not be ejected from the lock, it the lock is of a type which permits removal of the key from the lock at its on position.

However, a counterclockwise turning of the key to turn the lock off is accompanied by a like rotation of the detent on the housing, returning the pin ends 43' to the slot 40. Accordingly, when the key is turned to the oil position, the pressure of the plunger against the lock escutcheon will eject the key from the lock and into the operators hand.

As illustrated and described, the improved key actuator of the invention is a practical unitary assembly, useful through convenient and natural manipulations to facilitate key operation of an automatic key extraction from ignition circuits and analogous locks with protection of the key from other than the usual wear of repetitious use.

The alternate embodiment, illustrated at FIGS. 13 to 16, provides, in a similar construction, a housing 39a composed of a head 32a and stem 33a, whereon a detent 31a is rotatably afiixed by opposing pin screws 43a mounted in the detent 31a to be inserted through a slotway 47a in the stem 33a and to extend into a slot 46a of plunger 38a, the general organization of these features being the same as that hereinbetore described. The plunger 38a is modified, however, by the elimination of extensions and by the use of several sets of indents 48a at appropriate spacings to provide for adjustments for different type keys. Also, one leg of the plunger 38a is provided with an elongated slot 51, through which the end of a single mounting screw 37a projects, the head including a single centered opening for the mounting screw 37a, with the screw having a stem 52 which projects through the slot 51 to contact the head of a key, to hold the key in position, as in the manner clearly illustrated at FIG. 16. It is to be noted that the stem 52 of this mounting screw also serves to hold the plunger 38 in a fixed, non-relative position, with respect to the head, even with the key not in position.

Since changes, variations, and modifications in the form, construction and arrangement of the elements shown and described may be had without departing from the spirit of the invention, I wish to be understood as being limited solely by the scope of the appended claims, rather than by any details of the illustrative showing and foregoing description.

What is claimed is:

1. A key holder for a key having a blade adapted to be inserted into the slot of a lock, comprising:

a housing adapted to receive and securely mount a key,

with its blade projecting therefrom;

a spring loaded plunger means reciprocably mounted in said housing and biased to extend alongside to at least partially ensheath the key blade and to retract to expose the key blade; and

latching means including an exterior member turnable circumferentially of and constructed and arranged to turn said housing in opposite directions, said latching means being constructed and arranged to latch said plunger in its retracted position when said key blade is inserted into said slot of said lock to move said plunger to retracted position and said key is turned in one direction through said exterior member, and to release said plunger means when said exterior member is turned in the opposite direction to turn said housing and said key in said opposite direction, whereby said plunger will bear against said lock and urge removal of the blade thereform.

2. A key holder as defined in claim 1, wherein:

said exterior member is turnable relative to said housing for a limited extent, whereby said plunger means may also be forced to retracted position and latched without insertion of said key blade in said lock.

3. A key holder as defined in claim 1, wherein:

a cylindrical stern extends in fixed, coaxial association with said housing away from the key therein; and

said latching means exterior member is an annular detent journaled upon said stem for rotative adjustment.

4. A key holder as defined in claim 3, wherein:

said latch means includes a radially disposed, inwardly directed pin mounted on the detent, said stem having a radial slot through which said pin extends, said plunger means having a longitudinal slot and the pin normally projecting into the plunger means slot, and a side indent in the wall of the slot is positioned to register with the pin, with the plunger means retracted, whereby the pin may be moved into the indent by rotative adjustment of said detent.

5. A key holder as defined in claim 1, wherein:

said housing is formed with a nosed head having a diametric notch adapted to accommodate and hold the head of a key;

said spring loaded plunger means includes a longitudinally slotted plunger reciprocable in and outwardly from said bore in slidably embracing relation with the key end in the head notch and an expansive spring reactive against the end of said plunger; and

said key head is held against one side of said notch by a pair of set screws extending through said nose on the opposite side of said notch.

6. A key holder as defined in claim 1, wherein:

said plunger means includes removable extensions at its end to adapt the same for various size keys.

7. A key holder for a key having a blade adapted to be inserted into the slot of a lock, comprising:

a housing adapted to receive and securely mount a key, with its blade projecting thereform, said housing being formed with 'a nosed head having notch and clamp means for secure attachment of the key thereto;

a stem coaxial with said head at the side thereof remote from the notch and having a bore axially of said stem and head opening in intersection with the notch through the free end of said head;

a spring loaded plunger means reciprocably mounted in said housing and biased to extend alongside to and to at least partially ensheath the key blade and to retract to expose the key blade, said spring loaded plunger means including a longitudinally slotted plunger non-rotatably reciprocable in said bore in slidably embracing relation with the key seat of said notch and an expansive spring biasing said plunger to outward projection from the head; and

latching means complemental to the housing and manipulable to latch said plunger in its retracted position and to release the same, to permit the bias of the spring load to urge it to its extended position, said latching means including an annular detent journaled upon said stem over opposed openings in and extended circumferentially thereof, pins radially of said detent through said openings to end reception in the plunger slot, and indents interrupting the plunger marginally of its slot for coaction with the inner ends of said pins, Wit-h the plunger retracted subject to angular adjustment by the detent.

8. A key holder as defined in claim 7, including:

lugs on -the stem and sockets upon the detent adapted to receive the lugs, the lugs and sockets being pr0- portioned to restrict the rotative movement of the detent upon the housing.

9. A key holder as defined in claim 7, wherein:

References Cited UNITED STATES PATENTS 191,462 5/1877 Palmer 70414 X 10 2,514,940 7/1950 Doss et a1. 70414 2,699,667 1/1955 Mark et a1. 70414 2,738,667 3/ 1956 Thompson 70414 2,931,208 4/1960 Prim 70-414 2,989,861 6/1961 Schefrnan 70414 3,270,539 9/1966 Hirsch 70-414 MARVIN A. CHAMPION, Primary Examiner.

0 PERRY TEITELBAUM, Assistant Examiner..