Патент USA US2405821код для вставки
Aug, 13, E946. mam ' w. D. FÍEïRRIl's ETAL GARAGE DOOR EQUIPMENT Filed sept'. a, 19,41 ¿i /A 2 Shee’cs-Shee'c.~ l à . > BY: _ / / lNvENToRâV ~ Aug, 13,1954, w. D. FERRls ETIAL. v. GARAGE DOOR EQUIPMENT , Sept. 8I j 2 Sheets-gheet 2 WQ. , v A. BY: . d ¿è INVENTORS wwf ~ 2,405,821 Patented Aug. 13, 1946 UNITED STATES PATENT OFFICE 2,405,821 GARAGE DOOR EQUIPMENT William D. Ferris and Cecil R. Wolf, Sterling, Ill., assignors to Frantz Manufacturing Co., Sterling, Ill., a corporation of Illinois Application September 8, 1941, Serial No. 410,028 12 Claims. (Cl. 20-19) 1 This invention relates to closing and opening means for doors of the type generally known as garage doors, although the invention is of broader application where peculiarly adaptable therefor. and thereafter yields to let the door continue at a slowed down pace to full open position, and at which time an absolute check is provided for preventing the door going past full open po sition, said last mentioned positive door check Among the objects of the present invention is to provide closing and vopening means'for garage doors of the rigid door type, wherein the door is substantially vertical when closed, and being constructed in such a manner that the said track means, and wherein’ the door is pro vided with a pair of arms pivoted thereto, the tween the door and the jamb; to provide an ad checking and the complete stoppage of the door is accomplished without deforming the door check itself; to provide a door check for a door in substantially horizontal overhead position 10 of the foregoing character which has four func tions, to-wit, checking the s-peed of the door, when open, and wherein the frame forming the stopping the door, preventing the door rolling openings for the doors is provided with more or outwardly again after being stopped in open less horizontally disposed track means and the position, and lastly to maintain clearance be door is .provided with rollers adapted to run on opposite endsl of said arms being pivoted to» Sta tionary anchorages fixed to the side frame of the door on two suitable stationary brackets justment for this arm holding means so that it may contact the arms with sufficient pressure to produce the necessary friction for deadening the tendency of the door to rebound when the arm strikes the stop; to provide a pivotal con nection between the swinging lever of the door and the bottom of the door whereby all binding between the door and jamb is eliminated and the smooth rolling of the door wheels in the over necting the door with the door frame so as to prevent the door from opening too far and more 25 head tracks is assured, and whereby there is included also the perfect positioning and locating speciiically to provide means for holding such of all the important pivotal points in the door pivoted arms when they are in the open over hardware and its proper operation and action headv position whereby to prevent the door from is effected; still another object of the present opening too far; to provide, in association with invention is to provide a door of the foregoing 30 a door of the one-piece type, means for auto construction which provides substantially per matically swinging the door from a closed vertical fect positioning of the arm lever pivots, the over position to an open overhead position imme head track and the upper and lower weather diately the door is unlocked, and wherein a door strips so as to allow substantially perfect free checking means is provided to act in coopera dom of door action, and in addition to provide tion with the swingable pivoted lever which piv means which in association with the pivotal con-V otally connects the lower portion of the door nection of the lever arm with the lower portion with a bearing on a stationary abutment, where of the ,door whereby in the closed position of in the means operates on the lever to ñrst check the door the weight of the door is removed from the momentum of the moving door as it moves to open position whereby to slow down the door, 40 the lever arm and applied solely to the over head track mechanism, and alternatively which and thereafter positively prevents further move pivotal connection in the open overhead posi ment of the door beyond a predetermined po tion of the door is arranged so as to maintain sition, and in addition provides means to prevent the door in full open position and prevent it the door rolling lback out of the opening after lit has once reached full open position; to pro 45 from rebounding or moving outwardly toward downward closed position; to provide means vide a device of the foregoing nature which when tending to prevent any binding action at the properly adjusted assists in guiding the levers so-called breaking point of the door when the of the door and the door s0 that there will be door is operated; to provide means to prevent . no contact between the door and the door jamb or restrain the movement of the arm relative to during the opening and closing movements of the connection at the outer end of this arm with the door; to provide a door check for a door of the door when the door is in open overhead po the foregoing character formed of spring metal sition, while at the same time permitting the and bent in such a manner as to provide a snub- . within the enclosure formed by the door frame. In this type of door it is the object of the present invention to provide a door stop holder adapted to engage the pivoted arms intercon weight of the door to be carried by the track t bing portion for slowing down the momentum of the door as it approaches full open position 55 and roller means and not by the arms when the 2,405,821 3 4 door is in closed position; to provide in a door of the foregoing character an arrangement of horizontal overhead open position when the door provide suñicient force to start the door out wardly and upwardly automatically when the spring catch holding the door in closed position is released, whereby the opening position of the` door is substantially automatic and whereby this so-called self-starting movement in the opening The outer rear face of this bracket carries a mounting member 26 secured thereto by means is unlatched. This means comprises a pair of spring and lever construction so that the arm brackets I8 which are secured as at 20 to a or lever is located with relation to the spring metallic reenforcing weatherstrip 22 `rigidly when the door is in closed position so as to 5 mounted on the vertical frame 24 at and slightly overlying opposite sides of the door opening. of the door will eliminate the uncertainty of of the bolts 28, which mounting is provided with an outwardly extending bearing 30 in which is rotatably mounted a short pivotal pin 32, on one the door openingtoo fast or too slow as in the case when it is required to manually lift upon lever 34 and to the opposite end of which is the door te give it its initial opening movement; to provide a simple type of stop mechanism for ~ lever arms 3,4-and136. are arranged to swing with end of which is pinned a relatively long arm or pinned aÀ relatively short lever or arm 36. The the turning of the pivotal pin 32 as the latter rotates in its bearing 30. In short, as the lever and to provide in association therewith a snub» 34 swings upwardly with the turning of the pin bing action to prevent rebounding of the door its-bearing 36, the short arm 36 likewise swings after the door- hits the st_op during the comple 20 in an equal number of degrees. limiting the extreme opening position ofthe door tionof the opening movement; to Iprovide these and other objects of the invention as will be apparent from a perusal of the following speci ñcation, takenin-connection with the accom panying drawings, wherein; , Means is provided for pivotally connecting the k Figure 1 is a vertical sectional view taken on the line». l-I of Figure 2,v showing the door` in closed position ;„_ _ VFigure 2V is Aan inside view of the door taken on line 2-2 of Figure 1; ,Figure A»3 a ,vertical- sectional view showing the _door in open position ;A 30 of the lever or arm 34 is adapted to slide in the slot 46. When the door is in lowered position the arm 34 does not contact the lug 48. How ever, when the door is in open overhead position the arm 34 will contact this lug 48 for a purpose , >lí‘igure 4 is a perspective View of the operating mechanism when the door is in closed position; YFiguregö is a, perspective view of the operating mechanism when the door is in open position; Figure 6- is a perspective view of the right-hand hereinafter made evident.V A relatively longv coil spring 52 has one end thereoffastened by means of a pin 54 to the outer end of the short arm 35 and the opposite endY of the coil spring 52 is provided with an anchorage 56 engaging a rod 58 which passes through an inclined portion 66 of a bracket fas tened to the frame member 24. The upper p0r -tion of this bracketY is provided with a substan lower bracket which interconnects the outer end of the pivoted arm or lever and the door; Figure '7> is a plan section taken on line 'I-'I of Figure 5; Figure 8 is a detailedsection view taken on line 8-8 o_f Figure 4; Figure >il is a. detailed section View taken on line B_Sof Figure 8; , ReferringY now toA the drawingsl in detaiL, the, invention is illustrated in connection with, an enclosure _of any desired type, preferably a garage havin-g a frame 2 providing an,opening„the. roof of the garage being shown atA 4. At the: -topthe garage is> provided with tracks S which are pref erably inclined downwardly from front to rear for the;y purpose of eliminating the. tendency of the,v door to come back slightly after it reaches the complete overhead position., The door. agis preferably vof «therigid one-piece type and is adapted> when Closed to be inA substantially ver tical position ¿with respect to theframe opening as_shown- in Figures 1 and 4, and to be in sub stantially overhead openV position, as shown in 60 Figures 3 and 5. The upper front corners of thev door are pro vided.Y with a- bracket l0 which carries an angu larly disposed ear I2k on which is pivotally mounted as at i4 a roller I6 adapted to run in the track 6._ It is understood that there are rollers on each side of the door and tracks on. each side ofthe door frame whereby the upper rear opposite corners of the doorare supported by the track 6l , In cooperationwith the tracks 6 andthe rollers I6„ are provided means for pivotally supporting the vdoors so as automatically to cause them to swing from the substantially vertical closed posi tion upwardly and outwardly toa substantially outer end of the long lever 34` to the door 8. This means comprises. the bracket 46 shownv in Figure 6. This bracket is preferably formed L-shaped and comprises a flange 42 adapted to be fastened to the door by means of screws or the like and a right-angle ilange 44 having an elongated slot 46 and a laterally extending lug 48 projecting from thefree edge of the flange 44. A pivotal pin 50 connected to the outer end tially horizontal face or ledge 64,_ through which the free end of the rod 58 passes. A nut 66 adjustably holds the rod 58 with respect to the bracket, whereby the tension o_f the spring may be adjusted. The vertical stationary member 62 is a part of the doorwayv frame. Means is provided in association with the arms 34 for checking the speed of the door as it ap proaches full open position, and for thereafter absolutely stopping the door at full open position, for preventing the doorroliing reversely or out wardly and downwardly towards closed position, and for maintaining clearance between the door and the door jamb. YIn the door construction forming the subject matter ofy this invention the levers of the arm till and the spring means are so disposed as to cause the door to open automati cally when the latch is released without the op erator giving the door a preliminary outward or lifting movement. ' Due to the fact that the pres ent construction is devised so that the door will automatically open when once unlatched, the ef fectiveness of the lever and the spring power for holding the door in open position is somewhat sacriñced. Therefore to hold the door in open k overhead» position and to prevent its rolli'ngy back because of the reduced spring power and leverage at the open position, a door check mechanism is used which cooperates in a multifold manner with the lever mechanism to _produce a plurality of results. The. check means not only supplies a 2,405,821 5 6 the che-ck which provides a positive resistance for preventing the door going past full open posi tion and the shape of the entire door check and the speed and momentum of the door as it reaches its construction is important for it is the closed open position, as well as to positively check fur ther. movement of the door after the speed of DI end shape of the door check which is contacted by the arm, and therefore because of the bent end movementof the door has been reduced. In ad shape of the door check the arm cannot spring dition, the door’check, when once properly ad the flexible door check out of the way and con justed, assists in guiding the arm levers and the tinue, but is stopped quite firmly. at this point. door so that no Contact is possible in open posi Thus if the door action is abrupt enough the door tion between the door andthe door jamb. It is check actually does spring away some, but the practically impossible to obtain rigidity enough in end of the door check which is bent over to hold the arm levers and the bearing to obtain such the arm lever also pulls the arm lever with it so results without the door check, and the door check that even a very violent action of the door is accomplishes these results Very easily. The door holding means to prevent the door'rolling backv out of the open position, but also acts to lchange check means comprises a bracket 16 having a 15 brought under control bythe very flexibility built into the door check and without causing the door check to be bent out of shape. The spring power at this point is without 1e verage because of the pull required of the spring tionary frame of the door or any other fixed sup 20 to start the door opening and hence there is no~ tendency of the spring to pull the door back to port. >The outer end of this bracket is bent for closed- position when in this position, shown in wardly to provide a friction surface 14 and is also -Figure 4. On the contrary, by reference to Fig provided with a somewhat angularly bent holding ure 8, which represents the closed position of the portion 16 which terminates in an angularly dis door, it will be seen that the center of the pin posed flange 18 to receive the arm 34. This 54 in the closed position of the door is to the bracket is preferably formed of resilient metal left of a vertical line 9-9 passing through the and is arranged so that as the arm swings up center of the pin 32 and the pin 54, whereby the wardly the arm is adapted to engage the portion spring which is connected around the pin 54 and 14 and force the same laterally with suflicient pressure to produce friction, which thus deadens 30 which is constantly under tension in this position is always tending to open the door. Therefore, the tendency of the arm to rebound when the arm as soon as the usual latching means on the door strikes the usual door stopping member. By lat is unlatched, this spring is immediately operative erally adjusting this bracket 10, the friction pres automatically to raise the door to overhead open sure may be adjusted to control this deadening position and as the door approaches extreme open effect. ‘ position, as shown in Figure 5, .the spring itself The door ycheck means thus not only supplies slotted outer end 1l for adjustable attachment to the framework of the door, the adjustment being accomplished by means of a suitable bolt 12 passing through the slot and engaging the sta a holding means to prevent the door rolling back out of the opening, but also acts to check the speed and momentum of the door as it approaches the open position. In this connection it is de sired that the shape of the door check is of par will assume a contracted position and will not be under tension sufficiently to tend to move the l door downwardly again. It will be noted that the angularly disposed portion'18 of the check definitely forms a stop for the upward position of the arm 34 to limit ticular construction. For instance, by reference the overhead position of the door. ' to Figure 7 it will be seen that the portion 14 It will also be noted by reference to Figure 1 on the door check contacts the arm lever 34 more severely than at the balance of the straight 45 that in the closing and then in the closed posi tion of the door the pin 5G ris sequentially in the portion of the check as at 16 in Figure '1. After central portion of the slot 46 of the bracket 42 the arm levers, because of momentum, have on the door and then in the bottomrnost end of forced their way past the point 14, the arrn levers the slot respectively in either of which positions cannot return past the high point 14 on the door check. In addition, the door check is made so 50 the weight of the door is not borne by the arm 34. Thus, in the closing and closed positions, that it has a substantial flexibility of action so as not only to permit the high portion 14 to be the weight of the door is carried on the roller shifted laterally so as to permit the arm 32 to move therepast, but valso so that when the arm 34 i6 and on the track 6. strikes the pocket in the stop portion 18 the im pact will be taken up in the resiliency of the spring metal arm or bracket as a whole. I However, in _the open or overhead position of the door this same slotted arrangement is dis posed in conjunction with the lug 48 so that as the lever 34 swings to upward position as shown in Figure 3 the left edge of the lever will contact In ad dition the slot 1i in the door check provides an the lug 48 so as to prevent or restrain the move easy method of adjusting the severeness of en gagement between the door check and the lever 60 ment of the pin 5t in the slot when the door is in overhead position, retains the pin in the right arms 34. hand end of the slot 46 as >shown in Figure 3, Furthermore, the door checks, when properly which is the upper end of the slot when :the door adjusted, tend to guide the arm levers and door is in closed position. This prevents the door from so that no contact is possible in open position be again moving or rebounding outwardly beyond tween the door and the door jamb. This func the position shown in Figure 3 toward closed posi tion of the door check is accomplished very easily tion by limiting and preventing movement of the as otherwise it would be nearly impossible to ob door to the left in Figure 3 relative to the pin 50 tain rigidity enough in the arm levers and their on the upper end of the arm 34. The slot and bearings to obtain such results. When the arm lever moves into the door check with suñicient 70 pin connection between the door and the lever 34 also prevents any binding action at the break force that it reaches the end 18, as shown in ing point when the door is operated. Figure '1, the arm encounters a positive resistance preventing the door going back beyond predeter mined open position. The shape of the door check is important for it is the closed end 18 of 75 The main, purpose of the slotted plate 44, in cluding the slot 46 and the lug 48 is to allow proper operation and action Aof the hardware, 2,405,821 For instance, it` isf` virtually impossible to obtain.A an absolutely perfect. positioning ofthe pivot 32' of-‘the ann lever 34, the pivots 50„the overhead track, the upper weatherstrip t0, and the lower weatherstrip or vsteel' stop 22 so asto allow per fect freedom of door action. The location of all these points must be exact, and in the present construction it cannot be done because the main bearing or pivot 30 of the arm lever must be positioned inwardly away from the door jamb 24 so that the short lever arm 3S> may clear the door jamb asA the arm. swings arcuately. Con sequently if an ordinary hole or aperture were 8 as'. the door. approaches said stopmeans‘, whereby to effect'` a preliminaryy snubbing or dampening action on the movement of said arm assaid arm approaches extreme door opening position, said latter portion being shiftable out ofthe path of movement. of said; arm. to permit said arm to engage saidv first mentioned portion of said stop means, and said last mentioned means> being operative to prevent rebounding of the door. out wardly after contacting said iirstmentioned por tion of said stop means. 2; In combination with. an enclosure having a frame providing a door opening, a rigid door employed in the ldoor plate brackets 40, the therefor adapted in vertical position to close said hanger wheels I6 would -be forced upwardly opening and adapted to swing bodily to a sub against the top of the rail or track 6 when the stantially horizontal overhead open position, in door was being opened. However with the flex terengageable track and roller means connected ibility in the construction of'the slotted door plate to said frame and door, a Y stationary support bracket 4U, the wheelsv iii-í rol-1V smoothly in the mounted to the rear of said door when the latter bottom of the track as distinguished from the top, 20 is in closed vertical position, an arm having an and the upper and lower weatherstrips t0 `and. axis of turning disposed to the rear of said door 22 respectively do not bind' on the door or jamb. when in vertical position, said arm having at its Without this construction the smoothness and outer end a pivotal connection with said door, good» balance-of the equipment could» not be ob spring means interconnecting said door with a tained and the hardware wouldV be impractical to 25 stationary abutment on said frame tending to operate, due mainly to the substantial impossi shift said door from a closed position to an open bility of obtaining perfect positioning of all im position and stopv means including a portion portant pivotal points without the use of the slot disposed in thev path of movement of said arm ‘iiiv and- its cooperating elements. The lug 48T on and adapted yieldably to engage a portion of said the door plate 4‘0 assists in keeping the stud 50 30 arm, whereby preliminarily to check the move in the correct location when the door isV ap ment thereof, said portions being shiftable out proaching open position-,- in the manner herein of the way of said arm, said stop means includ before described. ing an additional portion adapted to lie directly It will be noted by reference to Figure 1 that in the path of movement of said arm whereby the lever 3d is located in relation to the pull of after said checking action absolutely to preclude the spring 52 when the door is closed so as to furtherv movement of said arm-beyond a predeter provide suiiicient force to start the door 8- out-v mined position, and said last mentioned means wardly and upwardly automatically the instant being operative to prevent rebounding of the the spring latch for the door is unlocked or door outwardly after contacting said iirst men released so that the opening operation of the tioned portion of said stop means. door; is practically- automatic and therefore differs from the construction of most doors of this type which require a manual initial movement of the door to start the door into upward movement and this starting action also eliminates the uncer tainty of the door going open too fast or too 3. In combination with an enclosure having a frame providing a door opening, a rigid door therefor adapted in vertical position to close said opening and adapted to swing bodily to a sub stantially horizontal overhead open position, in terengageable track and roller means connected to said frame and door, a stationary support mount quired as hereinbefore set forth.` ed to the rear of said door when the latter is Obviously the invention is not limited to the» in closed vertical position, an arm having an specific forms disclosed herein but is' capable of axis» of turning disposed to the rear of said door other modifications and changes without depart when in vertical position, said arm having at ing from the spirit and scope of the claims ap its outer end a pivotal connection with said door, pended hereto. spring means interconnecting said door with a rPhe invention is hereby claimed: stationary abutment on said frame tending to 1. In combination with an enclosure having a 55 shift said door from a closed position to an open frame» providing a door opening, a rigid door position, and a spring metal stop means disposed therefor adapted in vertical position to close said in the path of movement of said arm and having opening and adapted to swing- bodily to a sub a portion yieldable out of the path of movement stantially horizontal overhead open- position, in of said arm to permit continued but checked terengageable track and roller means» connected 60 movement of said» arm, said stop means including to said frame and door, a stationary support a further portion directly in the path of move mounted to the rear of said door> when the latter mentV of said arm to provide a positivestop there is in closed vertical position, arr arm having anl for, and said last mentioned means being oper axis of turning disposed to the rear of said door' ative to prevent rebounding of the door out when in vertical position, said arm having at its 65 wardly after contacting saidA ñrst mentioned por outer end a turnable pivotal connection with said tion of said stop means. door, spring means interconnecting said door with 4. In combination with an enclosure having a a stationary abutment on said frame tending toY frame providing a doory opening, a rigid door slow as in the case when hand starting is" re shift said door from a closed position to an open position and stop means disposed in the arcuate therefor adapted in» vertical position to close said opening and adapted to swing bodily to a sub path of movement of said arm and having a por stantially horizontal overhead open position, in tion adapted to be engaged by'said arm for posi tively limiting the extreme opening movement of said door, said y stop Vmeans having a portion adapted frictionally to` be engaged by said' arm terengageable track to said frame `and mounted to the rear is in closed vertical and roller means connected door, a stationary support of- said door when the latter position, an arm. having an 2,405,821 9 'axis of turning disposed vto the rear of said door when in vertical position,_ said arm having at its outer end a pivotal connection with said door, spring means interconnecting said door with a stationary abutment on said frame tending to shift saidpdoor from a closed position to an open position, and spring metal stop means disposed in the path of movement of said'arm and having a portion yieldable out of the path of movement frame providing> a> dooropening, a rig-id door therefor adapted in closed position to lie" sub stantially vertical and to shift to substantially vhorizontal overhead open position, substantially horizontal trackA means on the upper portion of said frame, roller means on vsaid door adapted to run in said track means, a relatively long arm, means providing at one end of said arm an axis of turningtherefor located to the rear of said of said arm to permit continued but checked 10 door when the door is in closed position, spring means having one end associated with a sta movement of said arm, said spring metalstop tionary labutment- disposed, to the rear of said means comprising an arm adjustable laterally door when the door is in closed position and hav with respect to the pathn of movement of vsaid ing the other end operatively associated with said first-named arm, whereby to provide a variation in the frictional engagement of said first-named 15 door -to assist in opening said door, means piv otally'interconnecting the outer end of said arm stop means with said arm as the door approaches and said door including a slot and pin connec its open position. tion therebetween arranged so that when the 5. In combination with an enclosure providing 'door is in closed position the pin will be ata a frame forming a door opening, a rigid door adapted to be associated with said frame to close 20 point in said slot removed from the upper end of said slot whereby, to remove the weight of said opening when the door is in substantially said door from said arm, said connection includ vertical position, said door being shiftable bodily ing stop means associated with the arm to pre to a substantially horizontal overhead open posi vent said pin moving in said slot in the open tion, bracket means disposed on the inside por overhead position of the door. Y tion of said frame, said bracket means `including a pivotal bearing, an arm having an axis of turn ing in said pivotal bearing, said arm at its outer end being pivotally connected to the lower por tion of said door, a substantially horizontal track for the upper portion of said frame and roller for the upper portion of said door adapted to run in said track, 'spring means having one end con nected to a- stationary abutment and operatively connected to said door to tend to swing the door to open overhead position from closed position and stop means mounted on said frame adjacent and above said bracket, said stop means having its inner end disposed vertically above the pivotal bearing and lying within the path of movement of said arm as said arm approaches the position 40 in which the door is in overhead open position, whereby to_limit said open position of the door, said stop means having a portion yieldably to engage the side of the arm to check the closing 8` In combination with an enclosure having a frame providing a door opening, a rigid door therefor adapted in closed position to lie’sub stantially vertical and to shift to` substantially vertical and to shift to substantially horizontal overhead open position,. subs'temtiallyv horizontal track'means on theiupper portion of said frame, roller means on said door adapted to run in said trackfmeans, a relatively long arm, means pro viding at one end of saidarm van axis of turning therefor located to the rear'of said-door when the door is in closed position, spring means hav ing one end associated with a stationary abut ment disposed to the rear of said door when the door is in closed position and having the other end operatively associated with said door to assist’iniopening said door, means pivotally interconnecting the outer end of said arm and said door including _a slot and pin connection it therebetween arranged so that when the door is in closed position the vpin will be at a point in page thereof and‘to prevent lateral swaying of said slot lremovedfrorr'rthe upper end of said the door during opening `or closing movement. movement of the door prior to the complete stop slot whereby to remove the weight of said door from said arm, said connection including means therefor adapted in closed position to lie sub 50 operative only when the door is in overhead posi tion to maintain said pin at the upper end of stantially vertical and to shift to substantially said slot. ‘ horizontal overhead open position, substantially 6. In combination with an enclosure having a frame providing a door opening, a rigid door 9. In combination with an enclosure having a horizontal track means on the upper portion of frame providing a door opening, a rigid door said frame, roller means on said door adapted to run in said track means, a relatively long arm, 55 therefor adapted in closed position to lie sub stantially vertical and to shift to substantially means providing at one end of said arm an axis horizontal overhead open position, substantially of turning therefor located to the rear of said horizontal track means on the upper portion of door when the door is in closed position, spring said frame, roller means on said door adapted means having one end associated with a station to run in said track means, a relatively long arm, ary abutment disposed to the rear of said door means providing at one end of said arm an axis when the door is in closed position and having the other end operatively associated with said door to assist in opening said door, means piv otally interconnecting the outer end of said arm and said door including a slot and pin connection therebetween. arranged so that when the door is in closed position the pin will be at a point in of.' turning therefor located to the rear of said door when the door is in closed position, spring means having one end associated with a station ary abutment disposed to the rear of said door when the door is in closed position and having the other end operatively associated with said door to assist in opening said door and means said slot removed from the upper end of said providing a pivotal connection between the outer slot whereby to remove the weight of said door from said arm, and means operative only in the 70 end of said arm and said door including a slot and pin connection operative when the door is open position of the door for preventing relative in vertical position to remove the pin from that bodily shifting movement between the pivotal end of the slot in which position the weight of connection at the outer end of the long arm and the door will be carried by said arm, said lost the door. 7. In combination with an enclosure having a 75 motion connection including means operative 2,405,821 1.1 «only when the :door -is in overhead position 'to maintain -the pin fat .such aforesaid »pend of Kthe slot. 1.0. In combination with an .enclosure having a frame «providing ,a door opening, a Vrigid door :therefor .adapted in .closed position to .lie sub stantially »vertical and to shift .to .substantially :horizontal overhead »open position, substantially horizontal track means -on the -upper portion Aof said frame., roller ,means »on said door adapted .to run insaid trackmeans, a relatively long arm, means providing at one end of said arm an axis .of turning therefor located> to the lrear .of said door when Lthe .door .is in closed position, .spring means .having -one vend associated with a station ary abutment >disposed .to the rear of -said .door when the `door in closed position »and having the other end operatively associated with said door to assist in opening’ said »door and .means the door and :operative when »the door is in ver tical position „to permit movement of the pin vertically downwardly in the slot so as to remove the weight of the door from the .arm together with .means for preventing relative -movement be tween the slot and ythe pin when the door is .in overhead substantially horizontal position, said last named means comprising astop lug disposed -in the path of movement of lthe arm for prevent ing the pin'from moving in the `slot only when the door is in overhead substantially horizontal position'. l ' 12. In combination with an -enclosure having a .frame providing a door opening, a lrigid .door therefor adapted .in .closed position to lie sub stantially vertical .and -to .shift to substantially horizontal overhead open position', substantially horizontal track means fon the upper por-tion of said frame, roller »means mounted on said door providing .a pivotal connection Vbetween the outer 20 relatively -close to the upper inner face of said end V»of .said arm .and .said -door including `a `slot door and adapted to .run in said track means and and pin pivotal .connection between the .arm iand .the Àdoor and operative when the door vis in ver tical position to permit movement of the 'pin ver comprising the sole support'for said door when the »door is in y'closed posi-tion, va .relatively long arm, means providing >at one end of said arm an tically downwardly .-in the slot .so las to remove 25 axis of turning therefor located -to the rear of .the >Weight 4of vthe door :from the .arm and vin said doorv `when the door «is in closed position, cluding means »for preventing .relative .movement the other Yend »of said arm being -pivoted to a between the .slot and the `pin vonly 4when the door bottom »portion »of said door, a .stationary abut is in l.overhead substantially horizontal position. ment disposed at the .rear vof the -door when the ~11. In combination with Aan »enclosure having 30 door is in closed'position, .spring means connected with the stationary abutment and having the thereforadapted in rclosed position to lie :sub other end loperatively associated with the door stantially vertical and'ito shift to substantially to assist in opening said door, and means pro horizontal »over-head -open position, substantially viding na pivotal connection between the »outer a `frame providing a door opening, a .rigid 'door horizontal track means :on the fupper portion of end 'of said arm and said door, said Aarm and said track .and .roller means constituting the sole sup port means for the door when the door is -in means providing at one »end of .said arm an axis shifted position, said last »named pivotal connec of .turning therefor located to lthe rear -of said tion between the arm :and door including means door `whenvthe door is .in closed position, spring 40 automatically shifting relative to the 'door to a means having one `.end .associated vwith a `station position to .remove ithe weight of the `door from ary abutment disposed .to .the :rear of «said `door said pivotal connection when the door .is in closed when the :door .is in 4.closed position .and having position, and .including .means -for interlocking the other endfoperatively associated with said the .arm and the idoor against relative :shifting door to »assist ¿in opening said door .and means 45 when the door reaches -open position. said frame, v«roller 4means ,on vsaid door adapted to run .insaid .track means, a relatively long arm, providing a 4pivot-.al ßonnection between the outer end of .said arm `and said Vdoor including ~a slot and _pin pivotal ~connection between the .arm and WILLIAM D. FERRIS. CECIL R. WOLF. Certificate of Correction Patent No. 2,405,821. August 13, 1946. WILLIAM D. FERRIS ET AL. It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 10, line 30, claim 8, strike out the Words “Vertical and to shift to substantially” ; and that the said Letters Patent should be read With this correction therein that the same may conform to the record of the oase in the Patent Oñìoe. Signed and sealed this 4th day of March, A. D. 1947. [mr-1 LESLIE FRAZER, First Assistant ûommíssz'oner of Patents.