US1920397A - Revolving door - Google Patents

Description

F. W. JOHNSON REVOLVING DOOR Filed June 30,

ug. E, 11933.,

Per

Patented Aug. 1, 1933 REVOLVING DOOR Frederick William` Johnson, Brighton, Englandv VApplication June30, 1932Serial N0..620,131, and

in Great Britain July 13, 1931 4 Claims. (Cx. en -1s) My present invention relates to revolving doors, and has for its object to provide animproved construction of a device for use in conjunction with revolving doors for automatically returning the door to a predetermined normal position. In such devices it has been proposed heretofore to provide tension springs which are` stretched as the door is opened so that `they reassert themselves and close the door when the door `is l0 released.

f According to this invention a device Vfor the purpose set forth comprises a member with a cam shaped or elliptical track anda loaded member engaging its said track one of said members moving with the door, the arrangement being that said loaded member is displaced against the influence of its load as the door is rotated by reason of the engagement with said cam shaped or elliptical track so as to store upV energy which upon 2O release of the door returns the door to the predetermined normal position.

The preferred form of my invention briey consists in the provision of a cam like track with which is engaged a member translatably moved over the said track when the door is rotated, the

arrangement being that the said member is displaced by reason of its engagement with the c am shaped track and mechanically applies afload to spring means so as to store up energy therein which upon release ofthe door sets into operation means for returning the door to apredetei-mined normal position. y

Briefly an embodiment of my invention comprises a pivot to which the door is attached, the said pivot having secured to it for rotation therewith a plate or frame carrying a pair of torsion springs', the said plate orframe having-f1tted thereto a pair of arms having freeA ends formed with runners engaging a continuous cam shaped or elliptical track disposed about the saidplate or frame and spaced therefrom, the said arms carrying lateral toothed segments or rack bars travellingover gear wheels rotatable on spindles coaxial With said torsion springs and adapted to twist the torsion springs to store `up energy therein when the door is rotated by reason of the movement of said arms about their pivots consequent upon their4 runners travelling over the said cam shaped or eccentric track.

In order that my invention may be clearly understood and readily carried into effect, I have appended hereto a drawing illustrating an embodiment thereof and wherein,

Fig. 1 is a sectional side elevation View showing an embodiment of my invention as applied to the upper end of a door. It will be understood that by reversalof this device it can also be iitted to the lower `end of the-door. f y Fig. Zfis a plan-view of Fig. 1. Y Fig. 3 is a detail sectional. side elevation View showing a suitable method of supporting the toothed segments which `operate the torsion springsghereinbefore referred to. p Referring to the drawing, the spindle to which the centre ofthe upperhorizontal edge of the door is aixed is lindicated bythe reference numeral 1 andit rotates Within `a casing Z'which is recessed in the ceilingA or super structure of the door. Fixed to the spindle l for example by being engaged over al square extremity 3 is a plate 4 which can Vconveniently be a disc as shown in Fig. 2. The periphery of this disc is spaced from a plate 5 which is formed with an elliptical inner edge `6. The location ofthe disc 4 within the plate 5 is such asl to provide a symmetrical space between them as more clearly shown in Fig. 2.k The -plate 5 can be secured within the` casing 2Y by means of screws 'l'.which pass vthrough the plate V5 and diagonal supports 8l in. the corners of the casing 2. The eccentric inner edge 6 of the plate 5 constitutes a cam track which when the disc or plate 4 is rotated with the door imparts pivotal oscillation to a pair of arms 9 each pivoted at one end by a bolt 10 to the member 4 vcontiguous tothe periphery of the member 4, the `:other `ends of the arms 9 being'free andcarrying rollers 11 the ,peripheries of which are grooved so that they run over the. ellipticaledge `6, the said edge preferably being rounded as shown in Fig; 1. The rollers 11 are located upon diametrical opposite sides Yof the member 4 and are constantly in contact with the edge 6 of the plate 5. Normally lthe position occupied bythe plate 4 and rollers 11` is that indicated in Fig; 2 in which the rollers 11 contact with the opposite points of the edge 6 containing the largest diameter of the` ellipse. This normal location is automatically obtained by the influence of coiled torsion springs 12 accommodated in sleeves 13 each abutting at one end against a collar 14 and at the other end against a bevel pinion 15. Each collar' 14 receives one end of the appropriate coiled torsion spring 12 and is rotatably disposed about a pin 16 and is locked in selected position by Y passing a pin through one of a number of radial holes 17 into` the pin 16. The pin 16 is locked at its outer endA in` a boss 18 by passing a pin through a hole 19 in such boss into one or a number of holes 20 in the pin 16. Each boss 18 comprises part of a bracket or plate 21 secured by screws 22 to the member 4. Y

The ends of the coiled torsion springs remote from the collars 14 are each vsecured to the appropriate pinion 15, each said pinion being xed on a spindle 23 rotated in a boss 24 of a bracket 25 secured by screws 26 to the member 4.

The pinions 15 are rotated sol as to apply a torsional load to thesprings 12 by reason of the `arms 9 being swung inwards as their rollers 1l travel around the track 6 and this is effected by pivotally connecting to the free end of each arm 9 an arcuate toothed rack or segment 27, the pivotal connection being indicated at 28. toothed rack 27 is preferably guided between the appropriate pinions 15 and one or more rollers 29 supported in bearing members 30 secured to vthe member 4 as shown in Fig. 3.

. the 'casing 2, the peripheries of these rollers contacting with the member 4.

It will be appreciated from the foregoing that the iniiuence of the springs 12 is such as to urge the arms 9 outwards so thatthe rollers ll are pressedl against the cam trackV 6 whereby the member 4 is carried to the position shown in Fig. 2 which for normal purposes can represent that appropriate to the closed vposition of the door. When the door is swung open the arms 9 are necessarily forced inwards and the pinions l5 rotated so as to increaseV the torsion of the springs l2 with the result that if the door is freed in the open position the springs 12 will reassert themselves Yand-,close the door.` An importantffeature of `my invention consists in the fact that the door may be rotateda number of times in lcontinuous succession without affecting thelfunctionof the spring mechanism for closing the door. The mechanism above proposed will produce an easy running action Vwhich can s be accommodatedin a smallspace and inwhich thespring means can be readily` adjusted by means of the collars14`and pins 16.

"1. A device for use in conjunction with revolving doors for automatically returning-a revolving door to a predeterminednormal position comprising a member with'a cam shaped track and a. loaded member-engaging its said track, one of -said members being connected with the door and the other being separate from the door so that the one' connected with the door is carried along the other as the door is moved Vto the'open position, the arrangementl being such that said loaded Each vmemberis gradually displaced against the influence of its load as the door is rotated by reason of its engagement with and the shape of the said cam shaped track so as to store up energy which upon release of the door returns the door to the closed position.

2. A device for use in conjunction with revolving doors for automatically returning a revolving door to a predetermined normal position consisting of a cam like track, a spring for returning the door to its predetermined normal position and a member engaging the cam like track and adapted to set the spring to an operative condition, said member being engaged with and translatably moved over the said track when the door is being rotated in the opening direction, the arrangement being such that the said member is gradually displaced as the door is being opened by reason of vits kengagement with the cam shaped track and mechanically applies a load to said spring so as to store up energy therein which upon re-u lease of the door setsinto operation means for returning the door to the closed position.

3. A device for use in conjunction with revolving doors for automatically returning a rcvoiving i door to a predetermined normal position coinprising a pivot to which the door is attached, a plate secured to the vsaid pivot for rotation therewith, a pair of torsion springs carried by said plate, a pair of arms fitted to said plate, runners at the free ends of said arms, a continuous substantially elliptical track disposed about the said plate and spaced therefrom and engaged by said runners, lateral toothed segments carried by said arms and travelling over gear wheels rotatable on l spindles coaxial with said torsion springs and adapted to twist the torsion springs to store up energy therein when the door is rotated by rea- 'son ofthe movement of said arms about their pivots consequent upon their runners travelling over the said cam shaped or eccentric track.

4. A device for use in conjunction with revolving doors `for automatically returning a revolving door to a predetermined normal position cornprising a pivot to which the door is attached, a plate secured to the said pivot for rotation therewith, a pair of torsion springs carried by said plate, a pair of arms fitted to said plate, runners at the rree ends of said arms, a continuous substantially elliptical track disposed about the said plate and spaced therefrom and engaged by said runners, lateral toothed segments carried by said arms and travelling over gear wheels rotatable on spindles coaxial. with said torsion springs and adapted to twist the torsion springs to store up energy therein when the door is rotated by reason of the movement of said arms about their pivots consequent upon their runners travelling over thesaidcam shaped or eccentric track, and

` means for adjusting the torsional eiiort of said springs.

FREDERICK WILLIAM JonNsoN;

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