US 1842123 A
Description (OCR text may contain errors)
Jan. 19, 1932. A RUSH 1,842,123
RELEASE AND BRAKE FOR FIRE RESISTING CURTAINS Filed Feb. 25, 1929 2 Sheets-Sheet l Snv'entor ALBERT RUSH S Q M wf A GttornegA.
Jan. 19, 1932. A. RUSH 1,842,123
RELEASE AND BRAKE FOR FIRE RESISTING CURTAINS Filed Feb. 25, 1929 2 Sheets-Sheet 2 Fig.5.
Isnoentor ALBERT RUS H fi m/4 WM 4 Gttorneg Patented Jan. 19, 1932 t UNITED STATES PATENT OFFICE ALBERT RUSH, 0E COLUMBUS, onro, 'ASSIGNOB r0, THE KINNEAR MANUFACT RING COMPANY, OF COLUMBUS, OHIO, A conrormrron or onro RELEASE AND BRAKE Eon FIRE ansrsrrivsfounrnrns Application filed February 25, 1929. Serial No. 342,629. I
This invention relates more especially to fire resisting curtains such as used in doors and the like that are provided with a counter balancing spring or springs adapted to facilitate the raising and lowering of thecurtain in normal circumstances and adapted to be zftiutomati'cally released for closing in case of re. I V
In such doors the counterbalanci-ng means or portionthereof is released in case of fire bythermally controlled devices and a brake automatically applied to retard the descent of the door for the purpose of preventing possible damage thereto. 1
The chief ob'ect of the present invention is to provide means restrained by the ther mally controlled devices for holding the counterbalancing springor-portion thereof in wound up or functioning condition for nor mal operation of the curta'inand the braking member'in non-functioning position, but so that upon the occurrence of fire and the consequent release of the thermally controlled devices the counterbalancing member is liberated to permit the closing of thecurtain and braking members contemporaneously released to prevent violent descent of the door. An advantage, among others of such construction is that the braking members are held in disengaged position during normal working of the door thereby avoiding noise and im pedance of operation of the curtain that would be occasioned by the idling of such braking members. Other objects and advantages of the invention will be apparent from the disclosure.
The invention is embodied in the example herein shown and described, the features of novelty being pointed out in the claims.
In the accompanying drawings- Figure 1 is a front view with parts in section of a fire resisting door winding roller equipped with my invention.
Fig. 2 is a front view on a larger scale of the right hand end of Fig. 1.
Fig. 3 is an elevation on a similar scale looking at the right hand end of Fig. 1.
Fig. 4 is a side view on a larger scale of a portion of the brake device.
Fig. 5 is a plan view of the lower end of Fig. 4. y
In the views 5 designates the curtain winding barrel shown as having a fraction 6 of the curtain attached'thereto. In the left hand end of the barrel is a coil spring 7' connected at one end to the winding shaftor barrel and at its other end to a solid shaft. 8 supported in the left hand end bracket 9, said shaft adaptedto be turned by a wheellO to place the spring under the desiredtension to'partially counterbalance thecurta-in and fixed in such position by a removable pin ll on the bracket and entered in a hole 10 in a projection on the wheel.
In the right hand end of the barrel is a coil spring 12 connected at one end to the barrel and at itsotherend to a solid shaft 13 sup ported in a plug 30 and plug extension 30 secured in the barrel, the plug extension'being supported in the right hand end bracket 14;, said shaft adapted to be turned by a wheel 15 affixed to the outer end of the shaft to permit the spring 13 to be placed under the neces sary tension to supplement that of'the spring 7 to completely counterbalance the curtain. By this means the curtain can be raised or lowered with comparative ease and will remain at its completely raised or lowered position or at any intermediate position in which. it may be left. The power of the spring 12 issuch that if released, the curtain will auto matically close by gravity.
The wheel 15 is madeat its rim with a number of teeth or projections 15; and the spring 12ylS held iniits aforesaid tensioned state by means of a tooth 16 carried by a lever 17 pivoted 'on a pin 17 on the right hand end bracket. Said tooth 16 engagesv one of the teeth 15v and prevents the release of the spring until liberated'by. the occurrence of fire. The lever 17 is held up in the position referred to by means of an arm 18 pivoted at 19 on a bracket 20 bolted to the end bracket, said arm being retained in this position by means of a wire 18 attached to a fixed point and containing fusible link 18 so that upon the fusing of said link the arm 18 and lever drop by gravity and release the wheel 15 and therefore the spring 12. As a consequence o'fthis liberation of the spring 12 the curtain, being insufficiently restrained by the said spring 12, unrolls by gravity to closing position.
On the end of the plug extension and secured by a key 21 is a toothed wheel 21 constituting an element of the braking means. The other element of the braking means consists of a pair of generally semi-circular arms 22 that are jointly pivoted on a pin 23 at the top of the outer face of the end bracket. Each of these arms is provided with a tooth 22 adapted to be projected into the path of the teeth of the wheel 21. The lower ends of the arms are complementarily tongued into each other to keep them in the same plane; and adjacent said tongues at their lower ends are provided oppositely beveled portions 22. The arms 22 are also connected at their lower ends by a coil spring 24 tending to draw them toward each other but only to such an extent that the pair act as an escapement device in cooperation with the toothed wheel.
Carried by the lever 17 is a wedge 25 adapted, when the lever is raised to place the toot-h 16 in position to hold the wheel 15, to operate on the beveled portions 22 to separate said arms 22 and remove their teeth from the path of the teeth of the wheel 21. When, therefore, the barrel is rotated in normal use the teeth of the wheel 21 do not strike the teeth of arms 22 thereby avoiding noise and impedance of the rotation of the barrel.
In practice when the lever 17 is dropped by the melting of the fusible link the tooth 16 and wedge 25 are contemporaneously removed from their functioning positions thereby liberating the spring 12 and permitting the arms 22 to be drawn toward each other by spring 24 into position to act as an escapement interrupting the rotation of the wheel 21, retarding the closing of the curtain and preventing its injury by violent descent. In this operation it will be understood that the two arms 22 form a ring that oscillates on the pin 23 in functioning as an escapement.
The forms of the parts can be changed without departing from the gist of the invention as claimed.
What I claim is:
1. In a fire-resisting curtain having a winding barrel, a counterbalancing tension member therefor, means for placing said tension member under tension, a brake device for the winding shaft including a spur wheel connected with the barrel, an escapement member composed of separable spurred parts to cooperate with said spur wheel, and thermally controlled means for holding the counterbalancing tension member and the separable parts of said escapement member out of functioning position and releasing the same for operation upon the occurrence of fire.
2. In a fire-resisting curtain having a winding shaft, a tension member thereon,
means for placing said tension member under tension, a brake device for the winding shaft including a spur wheel connected with the winding shaft, and an escapement member composed of separable parts pivoted to cooperate with said spur wheel, spring means tending to draw said escapement parts toward the spur wheel, and thermally controlled means for holding said escapement member out of functioning position and releasing the same for operation upon the occurrence of fire.
3. In a fire-resisting curtain having a winding shaft, a tension member thereon, means for placing said tension member under tension, a brake device for the winding shaft including a spur wheel connected with the winding shaft, and an escapement member composed of separable parts pivoted to cooperate with said spur wheel, spring means tending to draw said escapement parts toward the spur wheel and a thermally controlled lever having a tooth to engage said spur wheel and also provided with a wedge for holding the parts of said pivoted escapement member out of functioning position, and releasing the same for operation upon the occurrence of fire.
4. In a normally operative and thermally releasable fire resisting curtain, a curtain winding drum,a releasable counterbalancing tension member for the curtain, a brake means for the winding member including a spur wheel carried by the drum, a pair of separable escapement arms supported on a fixed point to cooperate with said spur wheel, means tending to draw said escapement arms toward said spur wheel, thermally controlled means for normally holding said counterbalancing tension member under counterbalancing tension also for holding the arm out of braking relation with the spur wheel, said thermally controlled means adapted to release said counterbalancing tension member and said braking arms for cooperation with the spur wheel upon a rise of temperature caused by fire.