Патент USA US2060491код для вставки
Nov. 10, 1936. 2,060,491 J. DIUNLOP MOVING STAIRWAY Filed- July 26, 1935 2 Sheets-Sheet l "Fril/A9 E,, > I ' NVENTOR vJames Dun/0,0 8% ATT NEY Nov.‘ 10, 1936. 2,060,491 J. DUNLOP MOVING STAIRWAY Filed July 26, 1935 2 Sheets-Sheet 2 6U Z5 a. INVENTOR Patented Nov. 10, 1936 2,060,491 UNITED STATES2,060,491PATENT OFFICE MOVING STAIRWAY James Dunlop, Park Ridge, 111., assignor towest-r ~ inghouse Electric Elevator Company, Chicago, 11]., a corporation of Illinois Application July 26, 1935, Serial No. 33,310 12 Claims. (Cl. 198-16) My invention relates to moving stairways and and 3 and 4 and lower tracks 5 and 6 by a pair more particularly to means for maintaining the of gear chains 1 and 8 between an upper landing ' step rollers and tracks of moving stairways free , (not shown) and a lower landing Ill. The gear chains are supported at the lower landing by a from dirt. One object of my invention is to provide for keeping the various moving parts of a moving stairway in a clean condition at all times during their operation. Another object is to provide automatic ap 10 paratus for cleaning the moving parts of moving stairways which may be easily and economically constructed, installed and maintained in opera tion. . A further object is to provide apparatus for cleaning stairways which shall be entirely auto matic in operation and which shall require prac tically no care on the part of the stairway at tendants. More speci?cally, it is the object of my inven 20 tion to provide apparatus which will automati pair of sprocket wheels H and I2. The chain 1 comprises a plurality of outer links l4 and I5 (Figs/5 and 6), a plurality of inner links 16 and‘ I‘! joined by a plurality of cross pins l3. Referring more particularly to Fig. 6, the pin’ “la is constructed with its ends provided ‘with grooved surfaces l9 upon which the ends of the outer links [4 and I5 may be mounted. The grooved surfaces l9 should be of such size that they will make what is known as a “press ?t” with cooperating holes in the outer links M and 10 I5 and thereby cause the pins and the links to freeze and turn or act as one body after the chain is assembled. A bushing 2| is rotatably mounted upon the pin I81: and the inner links l6 and I’! are mounted ' cally sweep from thejracks, from the step rollers _ upon the ends thereof by means of a “press ?t” so that the bushing freezes to the inner links and - which roll upon the tracks and from the step treads any dirt which may fall thereon. Other objects of the invention will be obvious 25 and appear hereinafter. For a clearer under standing of the invention reference may be had to the accompanying drawings in which: Figure l is a view, in side elevation, of the } lower landing portion of a moving stairway em 30 bodying my invention. ' Fig. 2 is a view taken on the lines II—II of Fig. 1._ . , Fig. 3 is a view taken on the line III-III of 35 Fig. 1. Fig. 4 is a top plan view of a portion of the stairway atthe lower landing. Fig. 5 is a detailed view of a portion of one of the sprocket chains shown in Figs. 1 and 4. Fig. 6 is a view taken on the line VI-VI of 40 Fig. 5. Fig. '7 is a view, in side elevation, of one of the inside track brushes shown in Fig. 1. Fig. 8 is a view taken along the line VIII--VIII of Fig. 7. Fig. 9 is a view, in rear end elevation, of the 45 track brush shown in Fig. 7. Fig. 10 is a view in side elevation of one of the outside track brushes shown in Fig. 2, and Fig. 11 is a view taken along the line XI-XI 50 of Fig. 10. Referring more particularly to the drawings, I have illustrated the lower landing portion of a moving stairway (Figs. 1 and 4) as comprising an endless series of movable steps S disposed to 55 be moved along two pair of upper tracks land 2, rotates with them upon the pin [8a. A chain roller 22 is rotatably mounted upon the bushing 2| for the purpose of engaging the sprocket wheel teeth as the chain operates over the sprocket wheel. The sprocket chain 8 is constructed in the same manner. Each of the steps S comprises a frame 24, a step tread 25, a pair of leading rollers 26 and 21 (see Fig. 3) and a pair of trailing rollers 28 and v 29. The tread 25 may be made of any suitable material, preferably of molded fibrous material with a heat-hardened binder. The surface of the tread 25 is constructed with a plurality of 35 grooves 30 which provide a plurality of cleats 3| on its upper surface. The grooves extend from the front to the rear of the step and may be of any suitable width so long as they are su?iciently narrow to prevent the shoe heels of the passengers 40 from entering therein. The front rollers 26 and 21 are connected to the steps S by an axle 33, the outer ends of which extend through the chains 1 and 8, the rollers being mounted on the outer ends of the axle be yond the chain in any suitable manner. By this construction, the front rollers are disposed to travel along the track rails I and 4 and thereby aid in supporting the chains 1 and 8 as well as supporting the steps S. It will also be apparent that this connection of the axle 33 with the chains provides a means whereby the movement of the. chains is imparted to the steps so that op eration of the chains causes the steps to be car ried along the stairway. The rear rollers 28 and 55 2,000,401 20 are mounted upon the step by an axle 34 in position to roll along the track rails 2 and 3. As the steps and chains approach the lower landing while being operated in the direction shown by the arrow 35, the front rollers leave the lower track rails 6 and are then left suspended in the air as the chains are carried around the sprocket wheels H and I2. The rear rollers 28 and 29 continue along the lower track rails 5 which turn into a circular guard rail 31 running concentric with the lower landing sprocket wheels. As the rear rollers start upwardly they' leave the guard rail 31 and move along a circular track rail 38 mounted on the axle 39 of the sprocket wheels. As the steps continue their journey around the lower landing sprocket wheels, the rear rollers leave the circular tracks 38 and move upon the upper tracks 2 and 3. As the steps continue, the upper rollers complete their trip around the sprocket wheels and ?nally come into engagement with the upper track rails I and 4. The steps now travel to the upper land ing (not shown) with their front rollers 26 and 21 upon the upper track rails | and 4 and their rear rollers upon the track rear rails 2 and 3. A frame 4| (only a portion of which is shown) is provided for supporting the stairway in its operating position. A combplate 42 is secured to the frame 4| at the lower landing ID to enable 30 the stairway passengers to enter and leave the stairway. In the operation of moving stairways, it is de sirable to keep the stair treads and the_ various parts of the stairway as free from dirt as possi However, in connection with the stair treads, it has been found desirable to clean out the grooves 30 but to leave the upper surfaces of the cleats 3| untouched except when they accu 35 ble. mulate such an amount of dirt as makes it neces 40 sary to brush or otherwise clean them by hand. In practice it has been found that the ordinary accumulation of dust and grit on the top surfaces of the cleats aids the passengers in maintaining their footing and keeps them from slipping while 45 they are making use of the stairway. In accordance with my invention I have pro vided a brush for automatically cleaning the grooves in the step treads while leaving the dust on the cleats undisturbed. This means com prises a tread brush 44 (Figs. 1, 3 and 4) located at the lower landing and having its outer ends bolted or otherwise fastened to the side mem bers 45 of the frame 4|. The tread brush is provided with a plurality of rows of bristles 46 so 55 disposed on its under side that they sweep through the grooves 30 of the step treads as the steps are moved along the lower landing. The tread brush may be located at any suitable point, however, in the present instance it is shown as 60 positioned at the rear of the combplate 42 and just ahead of the lower landing plate l0. From the drawings, it will be apparent that as the steps are operated along their tracks by their gear chains, the bristles 46 of the tread brush 65 will sweep through the grooves 30 in the treads and prevent the accumulating of dirt and dust therein. Inasmuch as the bristles 46 do not touch the top surfaces of the cleats 3|, the cleats will remain dusty and gritty, thus providing a 70 safe step surface. At the same time, if any large pieces of dirt or ?bres, etc., get across the cleats, the bristles will sweep them from the top of the cleats. Hence it will be seen that the brush will 75 tend to keep the cleats clean to a certain: degree but will not clean them to such an extent as to cause them to become polished and smooth. The rollers upon which the steps operate and by which they are guided along their tracks, have a tendency to pick up dirt from various sources and this dirt causes annoying effects when the rollers roll along the tracks. In order to auto matieally sweep the dirt from the rollers during their operation, I have provided a novel pair of brushes 5!! and 5|. The brush 50 is bolted or 10 otherwise secured to a portion 52 of the frame 4| in such manner that the face of the brush will engage each of the front rollers 26 on one side of the step as it passes around the roller landing. The brush 5| is disposed to cooperate with the brush 5!] and is mounted upon a member 54 of the frame 4| by means of a plurality of bolts 55. The face of the brush 5| is disposed opposite the face of the brush 50 and at such a distance therefrom that it will also engage the other side 20 of each of the front rollers 26 as the steps move around the lower landing. The brushes 50 and 5| must be so mounted that they will bear with unequal pressure upon the rollers 26. For instance, the brush 5!) may be mounted so that it will exert quite a pressure against the roller 26 and the brush 5| may be so mounted that it will bear lightly against the roller 26 as it passes. With this construction, as the roller 26 passes between the brushes, the 30 friction between the brush 50 and the roller tends to cause the roller to rotate against the lighter brush 5| and this action causes the brush 5| to sweep the dirt and dust from the roller. In some cases it may be desired to make the 35 bristles of one brush thicker and heavier than the bristles in the other brush and in that man ner secure the desired rotation of the rollers. In other brushes it may be desirable to combine the two effects; that is, to make the bristles of 40 the brush 50 heavy and thick and set the brush close to the roller and to provide the brush 5| with bristles of lighter weight than the bristles of the brush 50 and also set the brush 5| so that it will bear more lightly against the rollers than 45 the brush 50. In the construction shown in Fig. 1, both the positioning of the brushes and the weighting of the bristles are employed and the combination operates effectively to keep the rollers 26 free from dust and dirt as they pass 50 along their trip, thus leaving them clean to enter the tracks and roll along the track rails with a minimum amount of noise and effort. Although I have provided means for keeping the rollers clean, it is also desirable to provide 55 automatic means for keeping the roller tracks clean and free from dirt. To accomplish this purpose in practicing my invention, I provide a left hand inner track brush 58, a right hand inner track brush 59, a left hand outer track 60 brush 60 and a right hand outer track brush 6|. Referring more particularly to Figs. 5 to 11, the brush 6| is shown as provided with a body member 62 having a central hub 63 and brush faces 64 and 65. The brush face 64 is provided 65 with a plurality of bristles 66 and the brush face 65 a plurality of bristles 61. The brush is mounted on the chain 1 by a T-headed bolt 66 which passes through the bored out center 69 of the chain pin l8a. The T-head of the bolt 70 68 rests in a slot 10 in the outer face of the brush body 62 so that the bolt and the brush remain in ?xed relation to each other. The nut end of the oolt 68 extends through the pin Hill to have mounted upon it the track brush 59. 75 .' 2,060,491 The inner track brush comprises a body por tion 12 provided with an upwardly projecting member ‘I9 having a squared hole ‘I6 in its cen ter disposed to ?t upon a squared portion 14 of the bolt 98. A nut 15 is provided for holding the bolt in position as it extends through the outer brush 6|, the bored out pin I 8a, and the hub 13 of the brush 59. As noted, the T-headed end of the bolt 68 disposed in the slot 19 of the 10 outer brush SI and the- squared inner portion of the bolt disposed in the squared aperture 16 in the hub 13 cause the outer brush, the bolt and the inner brush to remain in a ?xed relation to each other and prevent independent movement 15 of any one of them. Thus it is seen that only one bolt is necessary for securing both the outer brush and the inner brush in their operative po sition on the drive chain. The brush 6| is so designed that its bristles 20 65 will engage the upper guard rail 68 and its bristles 61 will engage the track rail 4 while the steps are traveling along the upper portion of the stairway. The brush 59 is so designed that its bristles 19 will sweep the track rail, 3 as the 25 steps move along the upper portion of the stair 3 v matted upon the track and slicked over by the China bristle brush. In practice, it is usually sumcient to connect to each chain only one brush for each track rail except in cases where dirt is very heavy. In such instances, one China bristle brush and one steel wire brush for each track will usually be found more effective. By reason of the foregoing construction, it will be seen that I have provided automatic means responsive to operation of the gear chains for simultaneously sweeping dirt from the stair treads, from the step rollers and from the track rails as long as the stairway is in operation, thus keeping its various parts clean and causing the stairway to operate with ease and without pro 15 ducing such noise as usually follows operation of dirty steps over dirty tracks. Although I have illustrated and described only one speci?c embodiment of my invention, it is to be understood that many changes therein and 20 many modi?cations thereof may be made with out departing from the spirit and scope of the invention. I claim as my invention: 1. In a moving stairway, a frame, a plurality 25 of tracks mounted upon the frame, a plurality way. In order to maintain the brushes GI and 69 in of steps, a plurality of rollers mounted on the their correct position during the operation of the steps for guiding them along the tracks, a brush stairway, an extended arm or projecting member mounted on the frame with its brush surface dis 30 90 is mounted on the front portion of the body . posed to engage the tread surface of each step 30 ‘I2 of the brush 59. The projecting member 80 as the step passes the brush, a plurality of is provided upon its free end with a yoke or brushes mounted on the frame with their brush U-shaped aperture 8| of- such size that it may be surfaces disposed to engage the rollers as the fitted over a portion of the front axle 53 when steps pass, a pair of endless gear chains for 35 the brushes 59 and 6| are assembled and bolted moving the steps along the tracks and causing 35 together. The engagement of the arm 89 with the tread brush and the roller brushes to sweep the axle 53 prevents the brush 59 and also the the treads and the rollers, and a plurality of brush 6| from rotating relative to the chain so brushes connected to the chains with their brush that they will follow the movements of the chain surfaces disposed to engage and sweep the tracks 40 40 as it operates the steps along the track and thus as the chains move along the tracks. 2. In a moving stairway, a frame, a track cause the brush 59 to sweep the track rail 3 and the brush 6i to sweep the guard rail 68 and also mounted on the frame, a plurality of steps, a the upper track rail 4 as the steps move along plurality of rollers mounted on the steps for guiding them along the track, a brush mounted the upper side of the stairway. ' 15 As the steps reach the end of their upper trip on the frame with its brush surface disposed to 45 at the upper landing (not shown) they will round engage the tread of each step as the step passes the upper landing and move down along the the brush, a pair of cooperating brushes mounted on the frame with their brush surfaces disposed under side of the stairway, during which move ment the brush 6| will sweep the lower track opposite to each other and in position to engage a roller on each step as the steps pass the brushes, 50 50 rail 6. However, by reason of the changed posi tion of the steps while traveling on the under a chain for moving the steps along the track and side of the stairway, the inner brush 59 will not causing the tread brush and the roller brushes engage any track surface during that portion to sweep the treads and the rollers, and a brush connected to the chain with its brush surface of the trip. ~ 55 The left~hand inner brush 58 and the left-hand disposed to engage and sweep the track in ac 55 outer brush 60 are constructed and operated in cordance with the movement of the chain in ‘ practically the same way as the inner brush 59 operating the steps. 3. In a moving stairway, a frame, a track and the outer brush 6| except that they are constructed for attachment to the opposite or mounted on the frame, a plurality of steps, each of said steps having a tread provided with a plu 60 60 left-hand side of the stairway. In practice, it is usually found advisable to rality of grooves, a brush mounted on the frame employ what are known as China bristles in the with its brush surface disposed to engage only various brushes, particularly in the inner and the the grooves in each tread of each step as it outer track brushes. However, in some cases it passes the brush, and a chain for moving the 65 has been found that the use of China bristles steps over the track and causing the brush to 65 sweep only the grooves of the treads of the steps. tends to let sticky dirt of a certain nature accu 4. In a moving stairway, a frame, a track mulate in spots on the track rails, the brush tend ing to slide over such small accumulations of dirt mounted on the frame, a plurality of steps pro and polish them without removing them. To 70 avoid this, I place a second brush 59a ahead of the brush 59 and likewise a second brush ahead of the brush 8|. The brush 59a is the counter part of brush 6i but is provided with steel wire 83 instead of China bristles. The use of the steel 75 wire breaks up any grit which may have become vided with grooved treads, a brush having its outer ends mounted on the side members of the 70 frame at the lower landing of the stairway, said brush being provided with rows of bristles dis posed to engage only the cooperating grooves in the tread of each step as it passes the brush, and a chain for moving the steps over the track and 75 4 2,000,491 causing the brush to sweep the-treads of the one of the pins,\said bolt having a T-head on its steps. one end and a non-cylindrical portion on its other end, a track brush disposed on the T-head end of the bolt at one side of the chain, a second brush, means for pivotally mounting the brush ‘track brush rigidly mounted on the non-cylin drical portion of the bolt at the other side of the on one portion of the chain, and means for con necting one end of the brush to another portion chain, and a projecting member disposed on one of the chain to maintain the brush surface of the end of one of the brushes for connection to an 5. In a moving stairway, a frame. a track mounted on the frame, a plurality of steps, a track brush in engagement with the track and sweep 10 it free from dirt as the chain operates the steps along the track. 6. In a moving stairway, a frame, a track mounted onthe frame, a plurality of steps, a plu rality of rollers mounted on the steps for guiding them along the track, a plurality of front axles, one for each step, for mounting the front rollers of the steps thereon, said axles extending through said chain, a brush pivotally mounted on a portion of the chain between the axles, and means for connecting one end of said brush to the front axle of the step adjacent to the position of the brush, whereby the face of the brush will, engage the track and sweep it as the chain operates the steps along the track. '7. In a moving stairway, a frame, a track mounted on the frame, a plurality of steps, a plu rality of rollers mounted on the steps for guiding them along the track, a plurality of front axles, one for each step, for mounting the front rollers 30 of the steps thereon, said axles extending through said chain, abrush pivotally mounted on a por other track pin to control rotation of both brushes while in operation and cause their brush 10 faces to sweep the tracks as the chains move the steps along the tracks. 10. In a moving stairway having a plurality of steps operated along a plurality of tracks by a chain, a T-headed bolt disposed through the chain, said bolt having a shaft with a non-cylin drical portion, an outer track brush mounted on the T-headed end of the bolt with a cooperating slot for the T-head to cause the brush to turn with the pin, and an inner track brush mounted 20 on the non-cylindrical portion of the bolt at the side of the chain opposite to the ‘outer track brush, said inner track brush having its brush face disposed to engage the inner track, a projecting member disposed on the end of the inner brush, 25 and means for connecting the outer end of the projecting member to an adjacent portion of the chain to prevent rotation of the brushes and bolt beyond the normal rotation due to the operation 30 of the chain. 11. In a moving stairway having a plurality of tion of the chain between the axles, an arm on steps operated over a track by a chain, a frame for the brush having a recessed portion disposed to embrace the front axle of the step adjacent to the position of the brush, whereby the face of the brush will engage the track and sweep it as the chain operates the steps along the track. 8. A brush for the tracks of a moving stairway comprising a body, a plurality of brush bristles supporting the track, a plurality of brushes dis 40 disposed on one face thereof, a projecting mem ber on the central portion of said body, said mem ber being provided with an aperture for pivotally connecting the brush to a portion of a moving stairway chain, and an arm disposed on one end 45 of said body, said arm having a recessed surface at its outer end for engaging another portion of the moving stairway to control rotation of the brush after it is pivotally mounted in position on the chain. 9. In a moving stairway, a track, a plurality of 50 steps, a plurality of rollers mounted on the steps for guiding them along the track, a chain com prising a plurality of links and pins for moving the steps along the tracks, a bolt disposed through posed with their brush faces facing each other to engage the rollers on the step as the steps are 35 moved along by the chain, and means for mount ing the brushes with the pressure of the one brush greater than the pressure of the other brush against the rollers whereby the one brush causes the roller to rotate against the other brush to be swept free of dirt. 12. In a moving stairway having a plurality of steps operated over a track by a chain, a frame for supporting the track, a plurality of brushes disposed with their brush faces facing each other 45 to engage the rollers on the step as the steps are moved along by the chain, the bristles in the one brush being heavier than those in the other brush whereby the heavy bristles of the one brush fric tionally engage the rollers and cause them to ro 50 tate against the lighter bristles of the other brush as they are moved by the chain and are thereby swept free of dirt. JAMES DUNLOP.