US2284129A

US2284129A - Chair or seat structure and footrest construction therefor

Info

Publication number: US2284129A
Application number: US358580A
Authority: US
Inventors: Orville S Caesar
Original assignee: Tropic Aire Inc
Current assignee: Tropic Aire Inc
Priority date: 1940-09-27
Filing date: 1940-09-27
Publication date: 1942-05-26
Anticipated expiration: 1959-05-26

Description

I y 2 1942- o. s. CAESAR 2,284,129

I CHAIR QR SEAT $TRUCTUR E AND FOOT REST CONSTRUCTION THEREFOR Filed Sept. 27,- 1940 3 Sheets-Sheet l INVENTOR: 0mm 3. Cqesa;

' A A TTORNE Y y 1942- o. s. CAESAR 2,284, 129

CHAIR 0R SEAT STRUCTURE AND FOOT RES'i CONSTRUCTION THEREFOR Filed Sept. 27, 1940 s Sheets-Sheet 2 V 75 .50 57 j a. 45 3 T 1 3 .4, 3 6 6 '46 1 4 51 I 71 3 6| 7 76 1 6O 44 42.

85 INVENTOR:

' Obi/.12 S.Caesar V ATTORNEY I Ma 26, 1942. o, A R 2,284,129

CHAIR OR SEA'l STRUCTURE AND FOOT REST CONSTRUCTION THEREFOR Filed Sept. 27, 1940 :s Sheets-Sheet s mwszvron; L Orville 5. Caesa r ATTORNEY Patented Ma 26, 1942 CHAIR on SEAT STRUCTURE Foo rnas'r coNsnnUonoNTnEnEFoa Orville .S. Caesar, Barrington, 11]., assignor to -.Tropic-Aire, Incorporated, Chicago, 111., a cor- .poration of Delaware .Applicationisepteniber 27, 1940, Serial :No. 358,580 22 Claims. (01. 155-171) This invention relatesto improvements in chair or seat structures-and ioot rest constructions therefor, as well as to a mechanism for adjustably, releasably holding a foot rest or other suitable structure at anyene'oi-aplu-rality of adjusted positions. 7

Objects of the invention are to provide a releasable holding and adjusting mechanism per se, as well as to provide a holding mechanism in combination with a foot rest, including novel assembly and mounting schemes.

Another object is to so mount a foot rest in relation to the back-of a chair or seatas to permit the rest to be adjusted through an angle substantially greater than 180, and so that it may be moved to forward or rear positions, at each of which it is spaced a substantialdi'stance from the floor. An important feature of the invention is the provision of a unit-holding device of great strength, with a minimum'of bulk, and

with a minimum of thickness in an axialdirection so that the device does not have to be embedded in a support, as is required in so many instances where foot rests are used on bus seats.

Another object is to provide a device which can be easily attached or detached and easily serviced or inspected, and whichoccupies only a minimum space transversely of the seat.

Features .of the invention include: The specific construction of the holding device; the manner of assemblingiitsparts; the manner of releasably connecting .a foot rest structure :to the' holding device preparatory to assembly :on a chair; the

manner :of connecting the mechanism to the chair; theyarrangement of the foot rest in .relation to the particular chair and to a particular recess therein to give a wide :range of adjustment with a mechanism which :can hold the foot rest :at any location in a longarc ofadjustment; the use of :a pair of arms connected rigidly and having ejournaling projections and the relation of :these :projections respectively .to a bearing in the seat and to the holding mechanism; the schemeof assembling the foot rest on the seat after connection of the adjusting and holding Figure 2 is an elevation partly in section, looking' from the wall side toward the isle side, and

vviththe wall side shown in elevation;

Figure 3 is a section partly in elevation illustrating the adjusting and locking mechanism, taken on line 3-3 of Figure 5, approximately in the plane of the outer face of the toothedmemher or gear, parts of the foot rest structure being omitted, and with the mechanism in the normal or locking position;

Figure 4 is a view similarto Figure 3, buttaken on line 4-4 of Figure 5, approximately in the plane of the outer face of the outermost stationary disk,-and showing the mechanism in release .position to allow free rotation of the toothedmember or gear;

.Figure 5 is a horizontal section taken approximately on line '5 .5 :of Figure 3 withthemecheanism in locked position, and showing how the pivoting projection of the swinging arm 'of'the foot rest structure is releasably. secured .to the toothed member or gear, and how this member is journaled in a tubularextension of the main casing;

Figure '6 is a detail horizontal section taken approximately on line 6- 3 of Figure 1 showing how the second arm of the foot rest structure is detachably journaled to the base or chassis;

Figure 7 is a detail elevation of the casingper se viewing its interior; f Figure 8 is a detail end view of Figure'l;

Figure9 is a face view of one of the rotatable disks showing its handle extension;

Figure 10 is a 'face view of one of the stationary disks;

' Figure 11 is a detail edge elevation, partly in sponding key in the socket of the toothed member; and

Figure 13 is a viewsimilar to Figur 6, illustrating a modification of structure and assembly of the'gfoot r'e'stand bearing therefor.

' Referring to Figure l which, is a partial rear elevation of a twin seat structure such as is used in buses, and alsoreferring to Figure 2 which is an elevation partly in section, looking from the Wall side toward the aisle side of the seat. ,The numeral l indicates a pedestal and the numeral 2 generally indicates the base or chassis supportedon the pedestal. The wall side of the seat structure is suitably attached to the vehicle wall by means not shown. The construction of :this

- ceived by 'the socket members Band 9.

base or chassis has not beenshown in detail in this application, but is thesame illustrated in a copending application in which I am coinventor with another, said application bearing Serial No. 7

rest arranged therein and in 'combination with the particular holding mechanism. This recess is generally indicated by the numeral 4. The fl-i manner of assembling the foot rest structure along with the meansby which it can be adjustably held at a number of adjusted positions, the assemblyof this adjusting and holding means numeral has been applied at two places toshow that the recess extends below as well as above;

the seating level of the chair. It' is to be noted that the recess is continuous to a point underhollow and is made in two pieces, having a teleneath a removableseat or cushion section 5, and

r that there are-no obstructing cross-piecesat any v point in the recess.

The sides of the recess 4 are in part defined by upright plane, lateral wall surfaces 6, and

back is constituted by an inverted U-shaped frame generally indicated at I0; vwhich frame provides downward extensions which are preferably tubular, the extensions being generally.

indicated at ll, [2 in Figure 1,'and being re- Suitable pivoting means, notshown in detail but the scopic fit in the manner indicated at 3! The pieces are soldered together along the line of fit. As can be seen, it is a simple matter to insert the projection 26 within the tube 28 by a movement in an axial direction. This provides a very simple bearing construction, which is a feature of the invention. .There is enough play allowed between the projection and its bearing to permit the foot rest structureto'be swung in a direction transverse 'to its axis after 26 is inserted'in 28.

Another feature of the invention herein is the with the' foot rest being made before the foot rest itself. is' assembled within the recess. A feature is thearrangement whereby the element 26 can be first engaged with the bearing 28 or its equivalent, and then the, foot rest structure with its adjusting and holding mechanism attached,

can be moved to the positions of Figures 1 and 2 and thereafter heldby simple application of screws, the casing 32 of the unit mechanism being merely engaged with'inner face 6 of the element 8 as'shown. Thus, the entire holding mechanism lies in an easily accessible position, but because of its unique structure occupies very little space in an axial direction. Heretofore, it

has been thevpractice to arrange the holding device inside of some element like 8, where it is inaccessible, and because of this arrangement the assembly and disassembly of the foot rest structure and its adjusting and holding mechaposition of which is indicated by the numeral 7 I5, secures the arms within the sockets. In the application before mentioned is illustrated a construction whereby the backcan be swung to and held'. in a plurality of different angular positions with reference to the seat 5.

The back frame It! has a back cloth l5 bridging and stretched tautly across its sides and top.

The lower portion ll of the cloth extends downwardly; and forwardly to form the top wall of the 'recess 4. The lower end of the cloth is inserted ina metal clip; which'i's connected to the base.

as generally indicated at I9. The back cloth has a flexible rubber facing l3 which protectingly.

is mounted so that it can be easily assembled and disassembled. V i

Referring to Figure 6, which is a section approximatelyon line 6-5 of Figural. The foot rest comprises arms 2l and 22 rigidly cross-connected by a tubular member 23. Rotatable on nism isrelatively difficult and time-consuming, and therefore expensive.

Referring first to Figures 3, 4 and; 5.- The specific construction and manner of making and assembling the parts ,are important features of the invention, although the invention is not entirely limited to either of those features. An adjusting holding mechanism for a foot rest must bestrong because in use it often happens that children stand with full weight on the foot rest; Moreover, the foot rest must be relatively thin to take up as little space as possible in an axial this tube 23 is a foot rest 24 made in two parts secured by screws 25. Each arm is provided with a bearing projection. .The'projection of arm 22 is indicated ans. The projection of arm 2] is indicated in Figure 5 at 21. The func-.

tion' of the projection 26 is to engage in bearing 28-of the socketmember 9. The tubular member 28 traverses the walls of' both socket members 9' as'shown, and is suitably secured. The

as "by welding to the, arm 22' vafter passing through an opening in that arm. The arm is direction. Moreover for the sake of cheapness the construction should lend itself to stamping operations, and the present invention provides the advantages of strength, small cubical mass, axial thinness, cheapness and ease of assembly.

The mechanism is enclosed in the casing 32 which is adapted to be attached against a flat surface. In this instance, the casing is attached against the flat surface 6 of the tubular socket member .8. 7 For this purpose each socket member is provided with openings 40. The marginal flange of the casing indicated at 4| is provided with marginal projections 42, which enter the openings 40. I Four of these openings and projections are provided in this instance, and they serve to prevent any rocking or rotative motions of the casing after being secured by means of screws 43 and nuts 44. j

In assembling the parts the casing, the interior of which is shown in Figure -7, may be laid in a horizontal position and the plate-like parts successively dropped into place in the casing. The assembly scheme is a feature of the invention. The chamber of the casing, in this case generally cylindrical in contour, is indicated at 45 see Figures 4 and 5 and its cylindrical wall is pressed outwardly to provide recesses 46, four in number. Communicating with :one cof the .recesses 46;and the chamberand extendingzthrough the :cyilindricalside of the casing is an :opening- 48 also see :Figure 5; through :whichzan operating lever, constituted by .the extensionsof :a plurality of plates, extends.

.16 nooperaites with the bearing :boss pr extensiont'l-slxxanddihus the itoothrmember BIL-is centered and :journaled :by thezstationaryplate 16. The

Referring now to Figures and g7, and assuming that the casing "has been laid in a :horizontal position with its .main .recess or chamber facing upwardly. There-is first placed in the recess :a

movable plate 50 of the :general form of Figure l 9, which'has therein a pluralityof tangentially disposed slots'5l. "This plate-has a handle -extension 52 which is first passed through the opening 58. Next there is dropped in-a stationary plate 55 which has radial slots 56 therein, equal in number'to the slots5l anddisposed'in register therewith for the passage of pins. This plate has extensions 41 that enter recesses 4'6 'to hold it 'Next there iS'dIQpped a,

like the teeth of a spur gear. The object of the p teeth is to provide notches or recesses for receiving pins 63, which pins .movein and are moved by the slots when plates ,0 and 5'! .are-movedin unison. The toothedmember has a socket 0r recess Bl. The recesses formed by theteeth'are indicated at 62 and are adapted to ;receive pins 63, each of whichpasses through its own series of registered slots of plates $50, 55 and 51 and also through the corresponding'registered slotsin similar plates placedat the opposite side .of the gear (see Figure *5). limited to two handle plates. .Only one maybe used. The socket 6I'of the gear is provided with radial key recesses 65 which-cooperate with ,projections or key teeth .66 see Figurefllattachedor formed on pivoting projection 21 -.of 1arin- 2l;.of the foot rest structure.

As before described, the arm .2l is rigi ly connected by tube 23 with the-arm22. (See Figure 1.) It is a feature that thepivoting projection 21 and its key teeth 66 can abelengaged .with the recesses 65 of the toothed member-by movement in an axial direction, -or the recesses 55-.can be engaged with the teeth '56 .by movement in the same direction. The pivoting projection 2:1 is, journaled in a bearing extension 69 of the :casing 32 as best shown in Figure .5, and the :pivoting projection .2'L-is releasably secured to the toothed member and in the socket 6| by means of .ascrew 19. This connection of the foot rest structure to the holding mechanism is made before attachment of the rest .to the :chair'or othersuitable structure.

To proceed with the'description of :the :unit and the assembly of its parts.- The toothedrmember is provided with a circular :bearing, boss :12,

' and over this boss is now placed :another ringlike plate indicated at 15 which has slots zthere There is no 'intentionto be.

projection 21 is rjournaled in

theextension

6,9 of the cover 32, and :thus the .parts .21 and 60, held together by ascrew"1.;0, are journaled. There 'is nowrlaid against the :stationary 'plate 16 another ring-ilike platefll which has :slots therein of the same number and kindas those ofplatesfifl, 5] and 1.5. This plate H also has an opening which engages the boss-l2 asa bearing. The inner circular :surface of the chamber cooperates with :the circular *outer edges :of the ring-like plates and 5:l-to form bearings. Finally, a'thin cap plate 1911s laid :over the outer surface and flange 4| of the casing'32, to secule the previously assembled elements therein and screws and-nuts generally indicated at serve to hold-the late In introducing the

plates

50, 51, '15 and TI it isfirst necessary to pass 'thehandle extension 52ofeach'through the openin 48. The handles of the

plates

51,15 are each provided with a projection 85, said projections being engaged during 'assembly. fTheseprojections' act as spacers andthe combined thicknessesof the prowill bemoved simultaneously on oscillation of the handle froma position of Figure v3 to that of Figure 4, which movement will cause the pins to move outwardlyfrom the recess '62 of the gear and thus release the gear for rotation, and in turngrelease the part '21 which i an extension of the arm 2| ,of (the foot rest structure. It will also be .clear that the .foot rest has va toothed member or gear rotatable therewith and that there are plates, .one or more held vstationarily and one orymore vrotatably mounted, and that the slots .in ,the platesare registered in pairs and that'there are pins passing through the registered slots. It will further be noted-thatrotation of the rotatable plates either causes the pins to prevent irotation-of the-gear and thereforeof the foot .rest, or'causes the 1 pins to be disengaged by the teeth to permit rotation of the gear or toothed member.

in corresponding in number and .kind to ithose-of the

plates

55 and 51. This plate :15 also hasa handle 52. Against the plate 15 is then ,laid a stationary ring-like plate 'ltiwhich has gslotsof the same number and kind as shown (in the first mentioned stationary plate 55 at the-opposite side of the gear, andlplate lfi zlocks in the recesses A6. The be-aringopening of the :stationaryplate lSn-order tonormally maintain the pins in their inner or locked position as :in Figure 3, a suitable spring 88 'isprovided. The spring is connected :at one end to an car .89, preferably on one of the spacer elements :8.5, :and the opposite end 'of the springis connected to an extension 90 on the side of-th'e casing 32. It *will be noted, of coursegthat release of thepins-is made against action of the spring 88,- as indicated in Figure 4. l

Only a relatively light spring is needed for this purpose, so that the operation of the handle is easy.

An importantfeature of this invention is the provisionof a jlarge number of adjustments for therfoot'rest. Moreover, "insofar as the mechanismitself is rconcerned, an adjustment through a-completerarcof a circleacan be made by mean s of the structure herein. For this reason, as

shown in Figure 2; the rest hasavery large range of movement and can be held in. any positijonf within that range and at a large number} of difierent' positions. As shown in this figure; the a handle 52: projects rearwardly beyond the surface 6 and by inspection of Figure 1 it will be seen that thetotal thickness of the device in an axial direction is relatively. very 'smal1,and that the device is'in full View for inspection and repair. It will be noted that the plates 50- and I'll-are made in'rights and'lefts; but it isnot necessary to make rights and 1efts. Plates like51 arid'l5, without offsets, can be used alone with thesta+ tionary plates. -The .plates '51 and IS'arefiat throughouttheir length and differ only in this respect from plates 50 and H which are offset. Of course, all plates may be fiat and straight,

After attachment of the'ca'sing 32 to the chair structure or o'ther 'subitable structure, a pair of finishing r half-ca'sings 92 are applied and each is'heldby azscrew '93 threaded in the casing.

'Alsuitable finishing cap plate or plug 94 closes theopening 95 of arm 2|. Opening 95 permits introduction .or'removal' of screw I0.

and therefore interchangeable, It will further be understood that it is not necessary to have V pairs of plates50, 51 and 15,11, but, that a single plate such as 5] or such as 50 can beused. so there is no intention to entirely limit the :in-' vention to the number of plates. K

Inthis embodiment nine locking pins are-used, but it will be evident that a greater or lesser num; ber can be-used. Intheaggregate these-nine pins give great strength, so that a foot. rest controlled by this device the rest can sustain the weight of a person-or of children jumpingup and down on .the foot rest. Ordinarily inthese devices there are only three .or four adjustment positions, The present device provides thirteen adjusted positions and the invention can beembodied to. employ even a greater number, as many as thirty-six positions. V V

-An advantage is that the pins have bearings in plates which are at opposite, sidesof; the gear spotwelded -'on the opposite cup. -Within each cup and facing outwardly is spot welded a threaded nut 1021- ;-.The' foot rest arm 22 is provided with a-washer I05 spot welded to it on its inner side asshown. This washer is inserted and cen- V ters in the,cup 99", and a headed clamping screw I01 .passesthrough the wall of thearm 22 and through the washer and is threaded into the nut I02 within the corresponding cup.- The headed screw I0! is introduced. through an opening 95 in the opposite wall of the arm which is afterwardsclosed by a snap-in cover plate 94. When so that'theloa'd is evenly distributed in what is known as a double shear arrangement with the load distributed at two points, respectively at the opposite sides of the gear. Another advantage is thatthe device is an all-steel, pressed con-f struction which is very cheap. Another'advan-j tage is the ease of assembly. Anotheradvaintage is the smoothnessof, operation. 7 The, invention has'been shown as applied to. a

busseat structure and the explanation of its use in buses to have the foot rests so' arranged that they can be swung to a level to facilitate the cleaning of the bus floor. Therefore, in'a device of this kind, and particularly when used inthe environment just described, a large range of movement of the foot rest is necessary and adjustments of the rest are frequently made. Therefore, the adjusting means must be simple of 7 operation so that the adjustments can be quickly made.

Heretofore, the number of adjustments has been quite limited, as well as the total angular adjustment obtainable' In this case the total angular adjustment is in the neighborhood of 270 so that the rest may be brought to a'position substantially parallel with the back surface of the back rest or substantially parallel with the bottom surface of the frame which supports-"the seat 5, which isremovable; I i l the foot rest is rotated the washer and bearing cup ,are also rotated. Inasmuch as the arc of movement. of the foot rest is limited to about threeaquarters of a revolution the bolt and thread connection .between the cups can never become disconnected as a result of adjusting motions of the arm, although when adjusting occurs the bolt I00 screws in or out-of its nut I01.

In a'ssfembling the device the cup 99 carrying the bolt 190 is first inserted in the tube 28, then the opposite cupis insertedand rotated to thread itjonto th'e'jri'dof the bolt, thus securing the two cups.,- 1; 2

Thejassernbly'of the foot rest into its bearings is accomplished in the. manner previously described, with the exception that screw ID! is not used in tl 1e firstform,

mamas myinvention;

f ot'rest, rotatably mounted and having a a jembe'r rotatable therewith, a pair of plates, j one held stationarily and .the other rotatablymounted; slots in the plates registered in p'airs;'the slots of each pair being angularly related, and pins,- one passing through each pair of slots, said slots,- pins and teeth thus being so related that rotation of said rotatable plate either causes'th'e 'pins to engage theteeth to prevent rotation of the-member, or causes the pins to be disengaged from said teeth to permit rotation ofjthe'member. j

'2."A"foot 'rest'rotatably mounted and having a toothedmember rotatable therewith, a pair of plates, one held stationarily and the other rotatably mounted,'slots in theplates registered in pair's, th'eslots of each pair being angularlyv one direction causes the pins to engage the teeth to prevent rotation of the member and on rotation' in theiopposite direction causes the pins to be dis engaged from said teeth to permit rotation of the-member; i

I3 A foot rest rotatably mounted and having a toothed member rotatabletherewith, a pair of plates; one- 'held -stationa'rily and the other rotatably mounted, slots in the plates registered in pairs, the slots of each pair being angularly related, and pins, one passing through each pair of slots, said slots, pins and teeth thus being so related that rotation of said rotatable plate either causes the pins to engage the teeth to prevent rotation of the member, or causes the pins to be disengaged from said teeth to permit rotation of the member, the rotatable plate being rotatable about the axis of rotation of the toothed member, and motion of the pins being radial with reference to said axis.

4. A foot rest rotatably mounted and having a toothed member rotatable therewith, two pairs of plates, one pair arranged ateach side of said toothed member, one plate of each pair being held stationarily and the other plate being rctatably mounted, slots in the plates of each pair and registered in pairs, the slots of each pair being angularly related, and pins, one for each pair of slots, eachpassing through corresponding slots of both pairs of plates, said slots, pins and teeth thus being so related that when the two rotatable plates are simultaneously rotated, the pins are either engaged with the teeth to prevent rotation of the toothed member or are disengaged from said teeth to permit rotation of said toothed member.

5. A foot rest rotatably mounted and having a toothed member rotatable therewith, two pairs of plates, one pair arranged at'each side of said toothed member, one plate of each pair being held stationarily and the other plate being rotatably mounted, slots in the plates of each pair and registered in pairs, the slots of each pair being axially related, and pins, one for each pair of slots, each passing through corresponding slots of both pairs of plates, said slots, pins and teeth thus being so related that when the two rotatable plates are rotated, the pinsare either engaged with the teeth to prevent rotation of the toothed member or disengaged from said teeth to permit rotation of said toothed member, the rotation of the rotatable plates being about the axis of rotation of the toothed member, and the motion of the pins being radial with reference to that axis, the pins bridging thepairspf plates and having their axes parallel with the axis of rotation of the toothed member.

6. A device of the class described comprising, a casing having a chamber, the wall of the casing having an opening in communication with the chamber, a plate rotatable in the chamber and having an operating handle passing through and oscillatable in the opening and accessible at the outside of the casing, a second'plate in the chamber removably held against rotation-,a toothed member in the chamber at one side of which said pair of plates is disposed, a second pair of similar plates similarly mounted at the opposite side of the toothed member and in which said toothed member is journaled, means connecting said handles for motion in unison, slots in said plates in register, the slots of the second plate and of the other plates being angularly related, and pins, one passing through corresponding slots of all plates and adapted to move in or outof the path of the teeth, said slots, pins and teeth thus being so related that rotation of said rotatable plates by said handle either causes the pins to engage the teeth to prevent rotation of the toothed member or causes the pins to be disengaged to permit such rotation. V

7. A device of the class described comprising,

a casing having a chamber, a wall of the chamber having an'opening, a plate rotatable in the chamber and having an operating handle passing through and oscillatable in the opening and accessible at the outside of the casing, a second plate in the chamber held against rotation, a toothed member in the chamber at one side of which said pair of plates is disposed, a second pair of similar plates similarly mounted at the opposite side of the. toothed member and in which said toothed member is journaled, means connecting said handles for motion in unison,

slots in said stationary plates, radial with respect I to the axis of rotation of the toothed member, slots in the rotatable plates tangent with respect to a circle generated from said axis as a center, pins, one passing through corresponding slots of all plates and adapted to move in or out of the path of the teeth, when said plates are oscillated by said handles.

8. A device of the class described comprising, a casing having a circular chamber and having radially disposed recesses, the wall of the chamber having an opening in communication with the chamber through one of the recesses, a circular plate in the chamber engaging the wall of the chamber as a bearing and having an operating handle passing through and oscillatable in the opening andraccessible at the outside of the casing and removable through the opening after the plate has been moved out of the chamber by motion in an axial direction, a second plate in the chamber, removably held against rotation by projections entering said recesses, a toothed member in the chamber at one side of which said pair of plates is disposed, a second 7 pair of similar plates similarly mounted at the opposite side of the toothed member and in which a boss of said toothed member is journaled, means releasably connecting said handlesror motion in unison, slots in said plates in register, the slots of the second plate and of the other plates being angularly related, and pins, one

passing through corresponding slots of all plates and adapted tomove in and out of the path of the teeth, said slots, pins and teeth thus being so related that rotation of said rotatable plates by said handles either causes the pins to engage the teeth to prevent rotation of the toothed member or causes the pins to be disengaged to permit such rotation.

9. A device of the class described comprising, ,a casing having a chamber, a wall of the chamber having an opening, a plate rotatable inthe chamber and having an operating handle passing through and oscillatable in the opening and ac cessible at the outside of the casing, a second plate in the chamber held against rotation, a toothed member in the chamber at one side :of which said pair of plates is disposed, a second pair of similar plates similarly mounted at the opposite side of the toothed member and;;in which said toothed member is journaled, means connecting said handle projections for motion handles, said toothed member having a socket and said casing having a bearing leading to said socket, a foot rest having two arms, one having a pivoting element passing through said bearing and disposed within the socket, and

socket, and means in said socket and-on said one interof said plural pivoting means,-releasably locked for movement in unison.

11. A foot rest structure assembly having pluralmeans by which it can be mounted for pivotal movement, a mechanism for releasably holding the foot rest structure at any one of a plurality of angular positions, means releasably coupling one of said plural pivoting means and said mechanismincluding ascrew which is accessible through an opening in a part of said foot-reststructure.

' a 12. A foot rest structure assembly comprising" -a pair of arms connected by a foot piece,each

arm having a lateral projection constituting means by which the structure can be mounted for pivotal movement, a mechanism for releasably holding said structure'in any one of a plurality'of angular positions, and means releasably coupling said mechanism and one of said projectionsjincluding a screw which is accessible through an opening inone of saidarms from a point between the arms.

13. In combination with a base providing opposed walls, a foot rest structure comprising a pair of arms rigidly connected, each arm having an outwardly extending-pivoting projection, one

of said projections entering a bearing in one of the walls and being removable from the bearing by motion in an axial direction, a unit mechanism adapted to hold the footrest structure re.-' leasably at any one of a plurality of angular positions and in which the remaining pivoting projection is journaled for release by movement in an axial direction, and means releasably securing said mechanism to theopposite wa1l,-said foot rest structure, bearing, mechanism and walls being so related that on release of said securing means the entire assembly can be swung in a direction transverse to the pivotal axis and about said bearing as a center to bring said mechanism free of said surface, whereafter by motion of the entire assembly in an axial direction the first mentioned *bearing projection can be released from its bearing, whereby by a reverse operation the foot rest structureand its adjusting mechanism can be easily and quickly assembled on the base after the mechanismis assembled on the pivoting projection of said 'foot rest structure.

14. A twin seat structure :having four socket members for receiving the lower ends of each of a pair of backs for the seats, onesocketmember being arranged at eachend of the structure and two of the members being adjacently placed at the middle of the long dimension of the structure, a tubular bearing secured to the middleplaced members and traversing theinner wall of each, the outer wall of each middle-placed member having an opening-leading into said tubular bearing, a foot rest structure having' a pivoting projection passing through one .ofsaid openings and pivotally cooperating with said tubular bearfrom said tubular bearing.

rotation of said member.

to bev disengaged by the ,teeth to perm ing, and means pivotally, connecting said foot rest structure to the inner face of one of said end socket members, the relation of-isaid lastmentioned pivoting means to the f oot reststructure and the relation of the pivoting projection to the tubular bearing being such "that after release of said pivoting means, the rest structure can-be moved outwardly in a direction transverse to its axis to permit axial movement-of saidf oot rest structure a to disengage the 'pivot ing projection 15. A device of the class described including, a casing having a chamber having a cylindrical wall, an opening in said wall, a plate rotatably fitting the cylindrical wall of the chamber having a handle extension passing through said opening to a point outside of the casing, a second plate laid against the firstplate, and means to prevent its rotation in said chamber, a toothed member, means journaling it within the casing, slots in the plates registered in pairs, the slots of each pair being angularly related, and a pin passing through each pair of slots, said'slots, pins and teeth of said toothed-member thus beingso related that rotation of said rotatable plate either causes the pins toengagethe teeth to prevent rotation by the toothed member or causes; the pins to be disengaged by the teeth to permitjrotation of the member, and means acting on said handle extension to forcibly automatically bring its plate to and hold it in' that position whereat said pins are engaged with the teeth to'prevent 16. A device of the classdescribed including, a casing having a chamber having a cylindrical wall, an opening in said wall,;a platerotatably fitting the cylindrical wall of the chamber having a handle extension passing through said opening "to a point outside of the casing, said extension being withdrawable through said opening after moving said plate axially in relation to the chamber, asecond plate. laid against the first plate, and means to prevent its rotation in said chamber, a toothed memberand means journaling it within the casing, slots in the plates registered in pairs, the slots of each pair. being angularly. re-

lated; and a pin passing through each pair of slots, said slots,- pins and. teeth ofsaid toothed member thus being. so related .that rotation of said rotatable plate either causes the pins to engage the teeth to prevent rotation by the toothed member or. causes .the pinsto 'be disengaged by the teeth to permit rotation of saidmember; H

17. A device of. the class. described-including, a

"casing having a chamber, having .a cylindrical wall, an opening in said wall, a platerotatably fitting the cylindrical wall of the chamber having a handle extension passing throughgsaid opening jto a'point outside of the casing. saidiextension being withdrawable through said openingafter moving said plate'axiallyinrelationto the chamber, a second plate laid .against the. first, plate and means to prevent its rotationinsaid'chamber, atoothed member, journaled insaid-plates,

slots in the plates registered in pairs', ,the s1ots of each pair. being angularly related, andlapin passing through each pair of slots, said slots,.pins and teeth of said toothedmember thusb'eing so related that rotation of said rotatable plate either causes the pins to engage the teethfto prevent rotation by the toothed member or. causes thepins it rotat o of the member. J 18., A device of the class described, comprising a toothed member rotatable in a mounting, a pair 2,284,129 of plates in the mounting adjacent thetoothed' member, means holding one plate stationary and the other rotatably mounted, slots in the plates registered in pairs, the slots of each pair being angularly related, and pins one passing through each pair of slots and extended to the toothed member, said slots, pins and teeth being so related that rotation of the rotatable plate either causes the pins to engage the teeth to prevent rotation of the toothedlmember or causes the pins to be disengaged from the teeth of said mem of their axes, a pair of plates in the mounting adjacent the toothed member, means holding one plate stationary and the other rotatably mounted, slots in the plates registered in pairs, the slots of each pair being angularly related, and pins one passing through each pair of slots and extended to the toothed member, saidslots, pins and teeth being so related that rotation of the rotatable plate either causes the pins to engage the teeth to prevent rotation of the toothed member or causes the pins to be disengaged from the teeth of said member to permit its rotation. V

20. A device of the class described, comprising a toothed member rotatable in a mounting, a second member rotatable in a mounting, means releasably connecting said toothed and second members so that the second member can be disconnected from its mounting and from the toothed member by motion axially of said toothed member, a pair of plates in the mounting adjacent said toothed member, means holding one plate stationary and the other rotatably mounted, slots in the plates registered in pairs, the slots or causes the pins to be disengaged from the teeth of said member to permit its rotation.

21. A device of the class described, comprising a casing having a chamber, a wall of the chamber having an opening, a plate rotatable in the chamber and having an operating handle passing through'and oscillatable in the opening and accessible atthe outside of the casing, a second plate in the chamber, means holding said second plate against rotation, a toothed member in the chamber at one side of which said pair of plates is disposed, a second pair of similar plates similarly mounted at the opposite side of the toothed.

member and in which said toothed member is journaled, means connecting said. handles for motion in unison, slots in said plates in register, the slots ofthe stationary plates and of the rotatable plates being angularly related to one anof each pair being angularly related, and pins I after the plate has been moved out of the open side of the chamber by motion in an axial direction, a second plate in the chamber, means removably holding the second plate against rotation, a toothed member in the chamber at one side of which said pair of plates is disposed, a

second pair of similar plates similarly mounted at the opposite sideof the toothed member and in which a boss of said toothed member is jour-' naled, means releasably connecting the handles for motion in unison, and means associated with the plates including pins which are caused to move according to the direction of oscillation of the handles either to engage the teethto prevent rotation of the toothed member or to be disengaged to permit such rotation.

' ORVILLE S. CAESAR.