US2119574A - Refrigerator car door - Google Patents

Description

June 7, 1938. w M DWYER 2,119,574

REFRIGERATOR CAR DOOR Filed Oct. 19, 1936 6 Sheets-Sheet l 5 William Mflwyer' June 7, 1938. w, M. DWYER REFRIGERATOR CAR DOOR Filed Oct. 19, 1936 6 Sheets-Sheet 2 .fiwerzibr v WzZlzkzmMDwyer' .1; g:-

w. DWYER REFRIGERATOR GAR DOOR June 7, 1938.

Filed Oct. 19, 1936 e Sheets-Shet 3 frzverzz'ow Willie! Mfiwqer' June 7, 1938.

W. M. DWYER REFRIGERATOR CAR DOOR Filed Oct. '19; 1936 e Sheets-Sheet 4 Irzizerzfiyk Williarrz Mfiwyer June 7, w M W R 2,119,574

REFRIGERATOR CAR DOOR Filed Oct. 19, 1936 6 Sheets-Sheet 5 6 Irzvmiar MZllz'am M fiwyer June 7, 1938. I DWYER 2,119,574

REFRIGERATOR CAR DOOR Filed Oct. 19 1936 6 Sheets-Sheet 6 Fig. 8

. Inventor Willdzm Mfiwyer Patented June 7, 1938 REFRIGERATOR GAR nooR William M. Dwyer, Chicago, Ill., assignor to W. H.

Miner, Inc., Chicago, 111., a corporation of Delaware Application October 19, 1936, Serial No. 106,300

15 Claims.

This invention relates to improvements in refrigerator car doors.

,One object of the invention is to provide a door construction for refrigerator cars compris- 5 ing a sliding door member for closing the door opening of the car, and means for supporting the door for movement toward and away from the side of the car, wherein simple and efficient manually actuated means is employed for moving the 9 door into the door opening and forcing the door tightly closed or prying the door open and moving the same out of the door opening, so designed that the supporting means is entirely relieved from strain during the final closing and initial opening operations while the door is being forced tightly closed and pried open.

A further object of the invention is to provide means of the character described in the preceding paragraph, which is so designed and arranged that the projection of the parts thereof will not exceed certain predescribed limits so that the mechanism will clear the usual loading platform structure, tunnel walls, and all other obstructions encountered in standard railway practice. :55 Another object of the invention is to provide in a door construction of the characterhereinbefore described, efiicient, manually actuated mechanism for successively moving the door into the door opening and forcing the same to tightly closed position or successively prying the door open and moving the same to a position clear of the car wall, comprising crank arms for supporting and moving the door into and out of the door opening, and keeper and cooperating keeper 55 engaging means for effecting the final closing :and initial opening movements of the door, wherein the keeper means is mounted on thecar wall and the cooperating keeper engaging means is actuated independently of the supporting crank arms -i0 during said final closing and initial opening movements of the door, thereby assuring tight closing and forcible opening movements of the door without subjecting the supporting means .to any excessive strains during these operations. A more specific object of the invention is to provide a door construction and operating means therefor of the character described in the preceding paragraph, so arranged and designed that the manually actuated means which effects opening and closing movements of the door controls the operations of the crank arms and the keeper engaging means to effect movement of the door rapidly inwardly and outwardly through positive actuation of the crank arms and to bring the keeper engaging means into and out of cooperachronism with the movement tive relation with the keepers and effect operation of the keeper engaging means in the final closing and initial opening movements of the door, with slower movement of said arms in synproduced by said 5 keeper engaging means. r

A still further object of the invention is to provide in a sliding door construction for refrigerator cars, actuating means engageable with rugged and substantial fixed keepers for either forcing the door tightly closed after it has been moved to partly closed position, or prying the same partly open, the actuating means being designed to operatively'connect with movable supporting means for the door to actuate the supporting means to either move the door into the door opening to said partly closed position, or withdraw the door from said door opening.

Yet another object of the invention is to provide an operating means of the character set forth in the preceding paragraph, which, during the final closing and initial opening movements of the door, is automatically disconnected from the movable means for supporting and guiding the door. 7 I

Other objects of the invention will more clear- 1y appear from the description and claims hereinafter following.

In the drawings forming a part of this specification, Figure 1 is an elevational view, partly broken away, of the side wall of a refrigerator car, illustrating my improvements-in connection therewith, said view showing the door closed. Figure 2 is a viewcorrespo-nding to Figure '1, on an enlarged scale, of the mechanism shown at the 35 lower left hand corner of Figure 1. Figure 3 is a horizontal sectional view, corresponding substantially to the line 33 of Figure 2. Figure 4 is a view, similar to Figure 3, but showing the parts in position with the door withdrawn from 0 the door opening clear of the side wall of the car. Figure 5 is a broken, vertical, sectional view, on an enlarged scale, corresponding substantially to the line 5-5 of Figure 1. Figure '6 is a view, similar to Figure 5, but showing the doorwithdrawn from the door opening to clear'the side wall of the car. Figure '7 is a View, similar to Figure 1, illustrating another embodiment of the invention. Figure 8 is a View corresponding to Figure '7, on an enlarged scale, of the mechanism shown at the lower left hand corner of Figure 7. Figure 9 is a horizontal sectional view, corresponding substantially to theline 9-9;.of

Figure .8. Figure 10 is a view, similar toi-Figure 9, but showing'the door withdrawn from the opening to clear the side wallof the car.

door

In said drawings, 20 indicates the side Wall of the car, which side wall is provided with the usual door opening 2! closed by a singledoor 2 2. The door 22 is slidable lengthwise of the car and is displaceable laterally in reversedirections to either move thedoor into or Withdraw it from the door. opening 2|. As shown, the cooperating engaging edge faces of the door and walls of the door opening are beveled and the usualinsulating packing material indicated at 23 is eni-I ployed to seal the joint between therdoor and walls of the door opening.

Referring first to the embodiment of the invention illustrated in Figures '1 to 6 inclusive, my

improvements jcomprise broadly top and bottom tracks A' -A; carriers BB cooperating with the bottom track Aipairs of top an elongated bar member f 28 of substantially Z-shaped cross section fixed to the section 21,

with the lowerfiange of theformer spaced outand bottom'supporting brackets C-C andC-C; a 'pairiofvertically disposed combined, operating and keep er engaging crank shafts D-eD; pairs of top and bottom keepers,E-+E and E -E;, pairs of top and bottom supporting crank shaftsfF,-F andF-F; pairsof sliding rack members ,G-G and 'G-QG; interrupted pinion gears and I-IH on the combined operating and 1 keeper engaging crank shafts .D -D meshingwith the rack members G. Gjand G Gyand interrupted pinion gears K. K and onthe supporting crank shafts F-F and FFfc'ooperating with the rackmembers G. G an d (3-.

The top and bottomltracks AQ A, than are disposed respectively above and below the door opening 2|, are of suchalength that the door ZZmay be slid entirely cleanof the door open ing. The bottom, track A is in the form of an elongated bar having a substantially flat, vertically disposed, sectionfl fixed to the side wall of the 'car, a hgrizontally disposed outstanding section 25 at the bottom of the section 24, and a vertically disposed flange section 26 at the outer edge of the section 25, the flange section 26 forming' the rail member'proper" of the track. The

top track A comprises an elongated, fiat, barlike' section 2,! secured to the side wall of the cal. and

I Qm the i n 1 1 1 P ovid d w wardly facing guide channel, 2,9 therebetween.

As most clearly shown in Figure 1', each track A is provided jwith a stopmemberlSO atthe left hand end thereof, said stop member, being prefer ,ablyin the form" of a block fixed to-the track in any suitable mannen, The stop block 30 lof the bottom track A is preferably secured to the vertical section, 24 ofsaid track and extends into the channel between said section and the flange 26. The stop block 3ll of the top track is seated in the channel 29'thereof and is fixed to the side walls' ofsaid tracki l l The combined operating and keeper engaging shafts D"D are arranged vertically and'disposed at opposite sides of thedoor, each shaft D being rotatablysupported'b y the correspondingtop and bottom brackets CC, which brackets are secured tof the door adjacent to'the top and bottom edges thereof. EachjshaftD is provided with an op-" erating handle lever 3|, which is pivoted to the shaft .for swinging movement in a vertical plane, so, that it may occupy either the horizontal position shown. in Figure 1 or may be dropped to a vertical position parallel to said shaft. At the toprandbottom ends, each shaft Dis provided.-

- edge of the door.

with end members 32-32 which are fixed to said shaft and have crank arms 33-33 at the outer ends thereof extending radially therefrom and provided with keeper engaging pin portions 34-34 at their outer ends. The keeper engaging portions 34-34 are of generally cylindrical.

forinv and each has a flattened face portion35' for a purpose hereinafter described.

r .The supporting brackets CC and C-C are of similar design, the top brackets being arranged reversely to the bottom brackets. These brackets are preferably in theform of castings se' cured to the outer side of the door, each casting having a pair of vertically disposed, partly cylindrical bearing sleeves (it-36 formed integral therewith. The bearing sleeves 36-36 of each bracket are laterally spaced as shownmost clearly in Figures I, 2, 3,1and 4, and extend outwardly from the main body portion of the casting to the The sleeves 36-436 are enlarged in diameter attheirinner ends, asindicated at 31-31, and these enlarged sections open into a horizontally arranged housing portion 38.

of said casting. The housing portion 38 has a' horizontally extending, interior guidevvay J38 on the innerside thereof adapted to slidingly accommodate andguide the corresponding rack member G. Q V 1 Thetop and bottom end members 32-32 of eachshaft D are provided with cylindrical bearing sections inwardlyjof the crank end portions thereof, which bearing sections are journaled in the innermost sle'e'ves36'36 of the correspond ing top' and bottom brackets 0-0. The parts are so proportioned that the top and bottom keeper engaging crank members of each shaft D project a sufficient distance beyond the top and bottom edges of' the door to properly cooperate with the corresponding pair of keepers E E. Each shaft D is provided with two gear members HH, these gear members being preferably formedintegral with the end members 32-3Z. The gear memberH of each end member 32 is disposed at the inner end (if the cylindrical bearing section thereof and occupies the enlarged" portion 31 of the innermost bearing sleeve 36 of the cooperating supporting casting C.; Assh'own most clearly in Figures 3 and 4, each ofthe gears H has the teeth thereof interrupted, thereby pro viding part gear members for a purpose hereinafter pointed out. Each end member 32 also has a short cylindrical bearing section beyond the corresponding gear H, said bearing section being journaled in a bearing member 39 of the housi'ng portion 38 of the bracket C,

The supporting crank shafts F'F and FF are arranged in pairs at opposite sides of the door, one member of each pair at the top and the other at the bottom of said door. .Each' crank shaft F comprises a vertically disposed, cylin drical shaft portion 40, a radially disposed arm 4 I: at the outer end of said shaft portion, a vertically disposed, cylindrical, bearing projection or pin 42 at the outer end of the armldl, and a gear memberK formed integral with the shaft portion 40 adjacent to the innerend of the latter. Each crank shaft F has the shaft portion 40 thereof journaled in the outer bearing sleeve36 of the corresponding supporting casting C and has the gear K thereof accommodated in the enlarged section 31 of saidsleeve. The teeth of the gear K of each shaft F are interrupted, as clearly shown in Figures 3 and l, for a purpose herein after. pointed out. 7

The crank, shafts E-F nd F F. rveto support and guide the door in its movements into and out of the :door opening, and are slidingly guided by the top and bottom tracks A-A.

The carriers B-B which cooperate with the bottom track A support the bottom crank members F-F. Each carrier B is in the form of an elongated slide having enlarged end portions housing anti-friction supporting rollers 43-43 which are rotatably journaled in said slide :and project therefrom to engage with said bottom track A. These anti-friction rollers are prefer ably grooved, as shown in Figures 5 and 6, to receive and ride on the upstanding flange of said bottom track A. Substantially midway between the ends thereof, each carrier B is provided with a vertically disposed, cylindrical bearing opening 44 in 'which'the bearing or pivot pin 42 of the corresponding bottom supporting crank shaft F is journaled. The bearing pin portions of the top crank shafts F-F extend into the channel 29 of the toptrack A and carry anti-friction rollers 45-45 which are journaled thereon for rotation about vertical axes and substantially fit between the side walls of said track to properly support and guide the top crank arms for sliding movement lengthwise of the car. As will be evident, the door 22 is thus supported for sliding movement lengthwise of the car and for movement into and out of the door opening by the top and bottom crank shafts F-F and F-F, the arms of which have pivotal swinging connection with the supporting and guiding carriers on said tracks, the rollers 45-45 forming carriers which cooperate with the top track A.

The rack members G-G and G-G are all of similar design. Each rack member G is in the form of an elongated bar of channel-shaped cross section guided in the horizontal guideway 138 of the corresponding supporting casting C. Each rack G is provided with two sets or series of rack teeth 46 and 41, said two sets of teeth being spaced apartas clearly shown in Figures 3 and 4, and the set 41 being of greater length than the set 46 and meshing with the teeth of the gear H of the corresponding end member of one of the shafts D. The two sets of teeth are so arranged that the set 46 is out of mesh with the gear K of the supporting crank shaft member F when the parts are in the position shown in Fig-- ures 1, 2, 3, and 5, and are brought into mesh with said gear when the rack is moved a sufficient distance to the right, as viewed in Figures 1, 2, and 3, to effect rotation of the crank shaft F.

The keepers E-E and E-E are preferably in the form of castings secured to the side wall of the car in pairs at opposite sides of the door opening, the members of each pair being in vertical alignment and disposed respectively above and below the door opening 2!. Each keeper E is provided with an outwardly opening, inclined guideway which forms, in effect, a :cam groove or way 48, adapted to accommodate the keeper engaging pin portion 34 of the crank arm 33 of the corresponding crank member of one of the shafts D. These keepers E-E and E-E are so positioned that, when the door 22 is moved in front of the opening 2| and the crank arms F-F and F-F are rotated to swing the door inwardly. the keeper engaging portions 34-34 and 34-34 of the shafts D-D will be aligned with and enter into the slots or cam ways 48-48-4'8-48 of the keepers.

Latch means 49-49 of any well-known type is employed to lock the operating handles 34-3! of the shaftsD-D' in the position with the :door

closed, as illustrated in Figure .1. Additional latch means 50-50 of any well-known design is also provided for locking the operating levers 3l-3l in position when the same have been swung through a straight angle from the ;posi 1 tion shown in Figure 1, in rotating the shaft to open the door. When thus locked by the latch members 50-50, thelevers -3l-3'l of the shafts D-D hold the latter and theintergeared crank shafts F-F and F-F against rotation to hold the door in parallel :relation to the side Wall of the car and against lateral displacement while the same is being slid along the tracks .A-A.

The operation of my improved mechanism shown in Figures 1 to 6 inclusivein opening the door is as follows: With the door closed, as shown in Figure 1, after unlocking the handle levers 3 I-3 I each lever is swung outwardly away from the door, thereby rotating the corresponding shaft D. These handle levers may be actuated i either simultaneously or successively,.as desired. As will be evident, the shafts D-D will thus @be rotated in opposite directions. Except for the fact that the shafts D-D are rotated in opposite directions, the operation thereof is the same in each instance. Upon rotation of either of the shafts D, the top and bottom gears H-H thereof which are in mesh with the top and bottom racks G-G will effect sliding movement of said racks, the racks G-G associated with the shaft D at the left hand side of the door being moved to the right, and the racks G-G associated with the shaft D at the right hand side of the door being moved to the left. During rotation-of each shaft D, the keeper engaging crank members thereof,

which are in operativeengagement with the corresponding keepers E-E, will pry the door out of the door opening. During this movement of the shafts, the keeper engaging crank members will leave the cam ways of the keepers E-E and the toothed rack sections 46-46 of the racks G-G will be brought into mesh with the interrupted pinion gears K-K of the crank members F-F and rotate the latter to swing the door outwardly to the position shown in Figure 4.

When the parts are in the position shown in Figure 4, the shaft D will have been rotated through an arc of approximately and the operating handle lever 3! thereof will be disposed at the side of the shaft opposite to that occupied in Figure l. The attendant then locks the lever 3| to the door'by means of the latch 50, thereby holding the shaft D against rotation and through the geared connection with the crank shafts F-F, also looking the latter in fixed position. As will be evident, when both shafts D-D have been thus operated and locked in position, the door will be held spaced from the side wall of "the car a sufficient distance to clear'fsaid wall, as clearly disclosed in Figures 4 and '6. The attendant then slides the door along the tracks to completely clear the door opening. In closing the door 22, the same is slid to the position in front of the door opening 2!, .as shown in Figure 4. The actuating levers 31-31 are then unlocked and the shafts D-D rotated in reverse directions to the directions hereinbefore described,'thereby sliding the racks G-G and G-G and rotating the supporting crank members F-F and F-F to swing the door 22 into the door opening. During this rotation of 'the shafts D-D and the crank members F-F and the keeper engaging crank ends of the shafts D-D will be brought into alignment with the cam ways of the keepers E--E and E-E; Asthekeeper engaging or crank are in: flat bearing engagement with' the outer pin portions 34-34 of' the crank arms of each shaft D enter the cam ways of the keepers, the teeth 46-46 of the racks G-G will clear the gears KK, thereby permitting free rotation of the crank members 3I-3l during the remainder of the door closing operation.

Continued rotation of the shafts DD will bring the crank pins 3434 into engagement with the outer walls of the'cam ways of the keepers 'E-E and cam the door inwardly to the position shown'in Figures 1 and 3. The operating handle levers 3I'3'l of the shafts DD are then locked in'position by the latch members 49-49, as shown in Figure 1. The gears HH and H-H of the shafts DD are at all times in mesh with the racks GG and G-G, and as the rotation of these shafts 'is through an arc not greater than 180, only partial sets of teeth arerequired' on these gears, but, as will be evident, .the teeth need not be interrupted and gears having complete setsof teeth aroundtheir'circumference may beemployed without effecting or altering the operation of the mechanism. V V

When the dooris closed, the'flat faces 35'35 and 3535 of the'crank pins 3434 and til-34 walls of 'theslots'of the keepers K and as clearly shown in Figure 3, thereby'locking. the

. shafts DD against accidental rotation.

Referring next to the embodiment of the invenno illustrated in'Figures '7, 8, 9, and 10, the construction is substantially the same as that illustrated in Figures 1 to'6, with the exception that the racks GG and GG are omitted and the 7 gears on the combined operating and keeper en,-

gaging shafts D'-D are adapted to mesh directly with the gears on the supporting crank shafts FF and FF, and that the supportingbrackets for the shafts DD and the crank shafts 'F-F In the operation of the mechanism'shown in and FF, which correspond to the brackets 0 -0 and CC, are modified accordingly. These supporting brackets are indicated by fM'M and MM in Figures 7, 8, 9, and 10.

As shown in'the last named figures, the end members 32;;32 of each shaft D are provided with integral enlargements forming gear members PP which have interrupted teeth 5l 5l, and the cooperating supporting shafts FF are provided with-integral enlargements forming gears,

RR which have interrupted teeth 52 52. 'The bearing portions of each shaft D are rotatably supported inf outer bearing sleeve sections'53-53 formed on the corresponding top and bottom sup porting brackets MM, and the bearing portions of the cooperating crank shafts FF are journaled in the inner bearing sleeve sections MM of said brackets. 7 Each bearing bracket M is provided with a suitable housing portion55for the earsPahdR;1"f K 'As shown'most clearly in Figures 9 and 10, the first tooth at the right hand end of the set of teeth 5| of the gear P is shortened so that it will clear the second tooth from the left hand end of the set of teeth 52 of the gear R, where by engagement of said end tooth of "the gear P with the end tooth of the set of teeth 52'01 the. gear R is assured.

Figures 'Tto 10 inclusiva assuming that the door 22 'is' in the closed position shown in Figures 7,

' 8, and 9', rotation of the shaft D in a clockwise direction,.as viewed in Figure 9, effects outward camming of the door through operation of the keeper engaging crank ends of theshaft D, which crank ends are in engagement with the keepers E-E. The door is thus forced open 'in'the sam( manner as the construction illustrated in Figure: l to 6 inclusive. As the door is pried outwardly the keeper engaging crank ends of the shaft]; will pass out of the cam slots of the keepers E-gE and at the same time the teeth 5l-'5l of the gears P-'P will be brought into mesh with the teeth 52+-52 of the gears R R and'upon: further continued rotation of the shaft D, the crank shafts FF will berotated to swing the arms thereof outwardly and completely withdraw the door 22 from the door opening 2|, as shown'in Figure 10.

In closing the door, each shaft D is'rotated in a reverse direction to swing the crank shafts FF inwardly to move the door into the door opening and then 'cam the .door to tightly closed position by means of the keeper engaging crank members of the shafts DD, in the same'manner as described inconnection with the 'construction shown in Figures 1 to 6 inclusive; As 'will be evident, in the closing operation'the'gear teeth 5| of the gears P will become completely disengaged from the teeth 52 of the gear B. when the keeper engaging crank ends of: the

shaft D enter the camslots of the keepers thus leaving the crank shafts F-F 'freeto'rotate as the arms thereof are'swung through in' wardmovement of the door by the action of the keeper engaging crank members. f

I have herein shown and described what I now consider the: preferred manner of carrying out my invention, but the same is merely illustra-' ing, the combination with a door, adapted to close said opening; of guide track means on said car; carrier means slidingly guided on ".said guide track means; and'means for moving said door 7 to open or close the same; including a manually actuated operating membermovably mounted on 37 the door, fixed keeper means *with respect to which the carrier means is movablefrnovablei means supporting the door on said carrier means, means for actuating said, movable means by oper ation of said member toYmove said door either into or out of. the door opening, and means on said operating member engageable with said keeper means for either prying the door'open or forcing the same tightly closed.

2. 'In a door construction for refrigeratorcars having .a wall member provided with a door opening, the combination with a door adapted to close said opening; of guide track means o'n said car; carrier means .slidingly' guided on said track means; and means for to open or close the same including a manually actuated operating member movably mounted on moving said door,

said door, fixed keeper meanswith respect to' k which said carrier means is movable, keeper en gaging means on said operating member engageable with said keeper means'for'either forcing said door tightly closed or prying the same part- 1y open, movable means supporting the door on said carrier means for movement toward and away from the door opening, means'for transa mitting motion from said operating member to said movable means foractuating the latter to move said door either into, the door openingto engage said keeper engaging means with the fixed keeper means or out of the door opening to disengage said keeper engaging-means from said fixed keeper'means.

3. In a door construction for refrigerator cars having a. wall member provided with a door opening, the combination witha door adapted to close said opening; of guide track means on said car; carrier means slidingly guided on said guide track means; and means for moving said door to open and close the same including a manually actuated rotary operatingl bar mounted on the door, fixed keeper means on the car with respect to which said carrier means is movable, suppoiting arms rotatably mounted on the door and pivoted for swinging movement on said carrier means, keeper engaging means on said operating bar engageable with said keeper means for forcing the door either tightly closed or prying the same partly open, and drive means connecting said operating bar and arms for rotating the latter todisplace the door to either engage said keeper engaging means with the keepers or disengage the same therefrom.

4. In a, door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door'adapted to close said opening; of guide track means on said wall member; carrier means slidably guided on each track; fixed keepers on the car wall; rotary supporting crank shafts mounted on the door, said shafts having the outer ends of the crank arms thereof pivotally supported on said carrier means; a manually actuated rotary operating bar mounted on the door; keeper engaging means on said bar engageable with said keepers; and interrupted gear means operatively connecting said operating bar and crank shafts to rotate the latter during part of the door opening and closing operations.

5. In a door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening; of guide track means on said wall; carrier means slidably guided on said track means; fixed keeper means on the car wall; swinging arms pivotally supported at their outer ends on said carrier means and swingingly supported at their inner ends on the door for guiding said door either into or out of the door opening; a manually actuated rotary operating shaft on the door, said shaft having keeper engaging means engageable with said keepers; and gear means connecting said arms and operating shaft for swinging said arms, said gear means including driving and driven members, one of said members having interrupted teeth to effect disconnection of said gears during part of the opening and closing movements of said door.

6. In a door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening; of guide track means on said wall member; carrier means slidably guided on said track means; fixed keeper means on the car; a supporting crank member rotatably mounted on the door and having the outer end of the crank arm thereof journaled on said carrier means; a manually actuated rotary operating bar mounted one the door, said bar having keeper engaging crank means adapted to engage with said keeper means; and means for rotating said crank arm including a sliding rack member, and cooperating gears on said crank arm and operating bar, said rack having the teeth thereof interrupted to effect disengagement of said rack from the gear of the crank arm during part of the rotation of said operatingbar. I

'7. In a door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening;'of guide track means on'said'wall member; carrier means slidably guided on said track means; fixed keeper means on the car; a supporting arm rotatably journaled at one end on the door and at the other end on said carrier means; an operating shaft rotatably mounted on the door, said shaft having keeper engaging means rotatable therewith and engageable with said keeper means; and intermittent driving gear connections between said shaft and arm for intermittently effecting rotation of the latter during rotation of said shaft.

8. -In a door construction for refrigerator cars having a-wall member provided with a door opening, the combination with a door adapted to close said opening; of guide track means on said Wall member; carrier means slidably guided on said track means; fixed keepers on said wall; supporting crank arms rotatably mounted on said door and pivotally supporting the door on said carrier means; a rotary operating shaft mounted on said door, said shaft'having keeper engaging crank members cooperating with said keepers; and means driven by said operating shaft for rotating said arms with respect to the door while said keeper engaging crank members are disengaged from said keeper means, including intermeshing gear means having the toothed portions thereof interrupted to effect disengagement of said gear means during operative engagement between said keeper engaging crank means and keeper means.

9. In a door construction for refrigerator cars having a wall member provided with a-door opening, the combination with a door adapted to close said opening; of guide track means on said wall member; carrier means slidably guided on said track means; fixed keepers on said wall; supporting crank members journaled on the door and having the outer ends of the crank arms thereof journaled on the carrier means; a rotary operating shaft on said door having keeper engaging means thereon engageable with said keepers; and cooperating interengageable rotary gears fixed to said operating shaft and crank members for driving the latter, said gears having the teeth thereof interrupted to efiect disengagement thereof during part of the rotation of said shaft.

10. In a door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening; of guide track means on said car; carrier means slidingly guided on said track means; keeper means fixed to said car wall; a rotary operating bar on said door having means thereon engageable with said keepers; rotary supporting shafts on said door journaled on axes eccentric to said operating bar; radial supporting arms on said shaftspivotally supported at their outer ends on said carrier means; and intermittent drive means operatively connecting said operating bar to said shafts for rotating the latter during rotation of said operating bar.

11. In a door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening; of guide tracks on said car; swinging supporting arms slidingly guided at their outer ends on said tracks and rotatably connected at their inner ends to the door; gear means for rotating said arms on said'door; a rotary operating shaft on said door; driving gears fixed to said shaft; sliding racks on said door reciprocated by said gears, said racks having in-' terrupted toothed engagement with said gear means for intermittently driving the latter to impart rotary movement to said arms; keepers on said car wall; and keeper engaging means on said shaft rotatable therewith and engageable with said keepers to force said door either tightly closed or pry the same open.

' means on the c'ar'wall; a rotary operating bar vjournaled on said door; gears on said bar mesh- 12. In a doorconstruction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening; of 'guide tracks on said car Wall; supporting crank shafts journaled on said door and having the outer ends thereof swingingly supported from said tracks; gears on said crank shaftsgeach of said gears having an interrupted set of gear teeth thereon; keeper ingwith said interrupted sets of teeth of said first named gears; and keeper engaging crank members on said rotary shaft 'engageable with said keeper means. i

13. In a door construction for refrigerator cars having a wall member provided with a door opening; the combination with a door adapted to close said opening; of guide tracks on said car wall; a supporting crank shaft journaled on said door and having swinging connection with said tracks; a gear on said crank shaft; a keeper on the car wall; a rotary keeper engaging member on said door engageable with the keeper for forcing the door tightly closed or prying the same partly open; a gear fixed to said rotary keeper engaging member; and a reciprocating rack bar on said door cooperating with the gears of said crank shaft and keeper engaging member, the

teeth of :said rack being'interrupted tohpermit disengagement ofisaid rack from the gear of said crankshaft. o

14. In a door construction for refrigerator cars, havinga wall member provided with a door opening, the combination with aodoor adapted to close saiduopenin'g; of guide tracks'on said wall member; supporting crank shafts journaled on said door and having swinging connection with said tracks; keepers on the ear wall; ro- I tary keeper engaging crank members mounted on the door; and means for rotating said keepers engaging crank members and. shafts including reciprocating rack means operatively connected to gears on said keeper engaging crank members and crank shafts.

315. In a door construction for refrigerator cars having a wall member provided with a door opening, the combination with a door adapted to close said opening; of guide tracks on said wall member; supporting crank shafts journaled on said door and having swinging connection' with said tracks; keepers on the car wall; ro-

tary keeper engaging crank members omounted' I on the door; and means for rotating said keeper engaging crank members and crank shafts including driving connections between said keeper engaging crank members and crank shafts for producing synchronized rotary movement thereof to" swing said crank shaftson said tracks to displace said door either inwardly or outwardly with respect to the side of the car and either bring said keeper engaging members into opera tive engagement with the keepers or remove thev same from said operative engagement and rotate said keeper engaging members while engaged with the keepers to either force said door tightly closed or pry the same partly open.

WILLIAM M. DWYER. 40

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