USRE14674E - Door check and closer - Google Patents

Description

J. C. SCHMIDT.

DOOR CHECK AND CLOSER.

APFUCATION FILED APR. |9. 1919.

Reissued June 24, 1919. 1 4,674.

2 SHEETS-SHEET l- J. C. SCHMIDT.

DOOR CHECK AND CLOSER. APPLICATION FILED APR. 19. 1919.

Reissued June 24,1919. 14,674..

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

JOHN C. SCHMIDT, F CHICAGO, ILLINOIS.

noon CHECK AND CLOSER.

Specification of Reissued Letters Patent. Reissuefl June 24, 1919,

Original No. 1,266,864, dated May 21, 1918, Serial No. 190,231, filed September 7, 1917. Application for reissue filed April 19, 1919. Serial No. 291,364.

To all whom it may concern:

Be it known that I, JOHN C. Scanner, a, citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois have invented certain new and useful Improvements in Door Checks and Closers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in door checks and closers,one object of the invention being to provide an efficient device of this cha rider in which the use of liquid and the disadvantages iiicidenttliereto shall be avoided, and which shall depend for its accurac of operation upon pneumatic and friction brake means.

A further object is to so construct a door check and closer that no resistance will be offered to the opening movement of the door and which will permit full force of the strength of the spring during the closing movement of the door.

A farther object is to so construct a door check and closer employing pneumatic means that the vacuous condition produced will control the first half of the closing movementof the door, and so that the compression of air will control the other half.

A further object is to provide 'a door check and closer having pneumatic and frie tion brake means. in which coinpressi olnof airind vacuous condition will control the application release of the friction brake de e -L A- i 'the obj iS 9 i r v e si l a fd eflicient means for seciirii 'g the parts to hold tlie door any desired position H H Witlrthese and other o i invention consists in re I bf co'ris r ci n and omb c icis P rts is seer set forth and pointed out in the claims; a l k Fig. l is a bottom plan view partly in section showing the positions of the parts when the door is closed;

Fig. 5 is a similar view showing the positions of the parts when the door is open;'

ment being connected with said pistons bymeans of piston rods 6, 7 The pistons 4, are provided with check valves 8 which operate to permit free movement of the same in one direction and retarded movement in the other direction, and valves 9 are provided at the outer ends of the cylinders 2, 3 for regulating the degree of compression in one of them and the degree of expansion or vacuum in theother. I

In the present instance, the friction ele ment above referred to comprises a split of' divided brake ring 10 provided with a brake band 11 to engage the inner wall of the 05s ng 1. Located within thespace formed (lllVlCllllg the brake ring are two recessed blocks lfi lfl T hese blocks are secured to the adjacente of the clutch ring and in effect, constitu parts of the same. A short I eei'i' the blocks 12, is t ally -,i ':iei .ing. u l icl 'r r 1. is inoiirited so as scone, b fil s-O her. \blbcks 'thsh tishaf 'ing a angh caf band with An ai described, the short shaft 13 with the roller 15 mounted thereon constitute a crank on one end of the lever for ex 'ianding the clutch ring when said lever is moved.

The clutch ring is disposed under an annular shoulder 18 within the casing 1 and located within said brake ring and suitably pinned thereto so as to turn therewith. is a disk 19 fromwhich a spindle 20. made rigid with the same, projects upwardly and passes through an opening in a ca 1 rf21 on said casing. A spring is 10- catcd within the casing 1' and the wall of the casing is made with a slot 23 to receive lugs at. theouter end of said spring.

sleeve or spring winder 24 is mounted on spindle and is provided with a slot :25 to receive lugs on the inner end of the spring; The sleeve .or winder 24 passes 20 1;freelytlirough the hole in the cap 21 and is provided atits upper end with a notched lieadQG to receive a pawl 27 mounted on a lever 28 secured to'the upper end of the spindle :20. An extensible arm 29' is loosely 25:;coupled at one end to the lever 28 and at its ot-vher end. this arm is loosely coupled to a suitable bracket 30 to be secured to the; door frame- 7 D It "is apparent that when the door is 1) ied, motion will be imparted through the "lee-2s to the spindle 20 and the spring 22 to wind the latter and turn the brake ring 10.; The casing 1 is split as at 31, and the adjacentcdges are provided with perforated i glugs i2-33- through which a bolt 34 passes. Anpo tion of this bolt may be contracted somewhatv in size and is threaded to receive a nut 35. which bears against the lug Thel larger portion of the bolt is threaded wi y-and eceives theinternally threaded head of ajlever fift -a suitable ring or washer3l' being disposed between the lever headand the lug-33 on the casing. A portion of the bolt 34 flattened to receive a set screw 38 mountthe lug 32 to prevent movement of said The lever 36 may be provided with il to rest uponthe casing when said s n 3 its normalposition. By turning ever 36 on the threaded bolt 34, the

,d tightly clamp the brake ring to preventt'he. same from turning. The mocha maybe-locked in this manner to preovenie it; of, the door and thus the y tOCOll'IPBIl-Stltfi for wear between and of the brake ring and the casing,

the operation of myim 'iroveiiients, no u auc'eisotferedby the movements of the met nsin the cylinders to theopening. of the d.

, ;ged:asto permit ,free movei ientof said stoiisduring the opening movement of the .will a. be contracted :somewhat and I maybe held in any desired position. a

(in; 3-Limay be adjusted longitudinally.

(the valves in sai'dopistons being door. The spring will be permitted to exert its full strength during the closing movement of the door and this closii'g movement is controlled by the automatic application and release of the brake as efl ected by the retardation and release of the pistons in the cylinders.

hen the door is being opened, the spring Will be wound and its force will be applied to cause the closing of the door when the latter has been releiised. \Vhen the door is being closed by the application of the force of the spring 22, the clutch ring 10 will be turned and power will be applied to the pistons.- At the beginning of the closing movement of the doorthe pistons cannot move freely because a vacuous condition will be created in one of the cylinders and air will be compressed in the other cylinder.

Such retardation of the movement of the pistons as compared to the forceof the spring :22 tendingto move them, will cause the lever 16 to be turned slightly andits crank to expand the clutch ring. as previouly explained. This application of the brake will cause a retardation of the closingniove-* son of the vacuous condition created in the cylinder 2; As the door approaches its closed position, the compression of: air m the cylinder 3 will causethe final portion of i the closing movement of the door'to be re tarded suiliciently to prevent slaii'miing. a The reason for the 1 Empl0' \ft1lel1t()f two oppositely acting cylinders and pistons is" o that the 'one in which compression takes place will hardly become effective until the piston has traveled at least half of its stroke; the employment ofth'e cylinder andpjstoir which operatesto reduce the pressure as surestlie maximum resistance atthe begin? ning of the stroke. this resistance lessening as fluid is admittedthrough the control valve. By a suitable adjustiiient o f" the control valves 9 tlie resistance maybe n-a de I substantially: uniform throughout the whole len h of the stroke if desired.

rom the above description it"wil l that the first half of the'cloiing' movei'nentf of the door is controlled primarily'by the reduced pressure in the cylinder 2, the action of the cylinder 2 being progressively augmented by the increasing pressure fin thecylinder 3 while the last half of t-iie closing movement is primarily under the control of the compressed air in the cylinder 3 which control is progressively reduced so far as the cylinder 2 is concerned. Of course, where a liquid is employed instead of air a single cylinder may be used as the difliculties in connection with a compressible medium such as air will not be present in the use of liquid.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a door check and closer, the combination with a spring-zu'tuated member, of

a friction device connected therewith, and pneumatic means for controlling the application and release of said friction device.

2. In a door check and closer, the combination with a spring-actuated member, of a friction device connected therewith, a lever for operating said friction device. and pneumaticmeans connected with said lever for controlling the automatic application and release of said friction device.

3. In a door check and closer, the combination with a spring-actuated member, of a friction device connected therewith, operating means for said friction device. and pneumatic means connected with said operating means for retarding the movement of the latter to effect the application of the friction device during the.v initial closing movement of the mechanism.

4. In a door check and closer, the combination with a spring-actuated member, of a friction device connected therewith,operating means for said friction device, alining cylinders, pistons in said cylinders. valves for .controllingthe movements of said pistons, and means connecting both of said pistons with said operating means.

5. In a door check and closer, the combination with a spring-actuated member, of a friction device connected therewith, a. cranked lever for expanding said friction device, alining cylinders, istons in said cylinders, "alves' for contro ling the move ments of said istons, and rods connecting said pistons witili said cranked lever.

6. In a doorcheck and closer. the combination with a casing, and a spring-actuated member, of a split brake ring located within said casing and connected with said 5 )ringactuated member, a lever mounted in the space between the ends of said ring and having a crank disposed between the adjacent portions of said ring, alining cylinders on the casing, istons in said cylinders, valves for contro ling the movements of said pistons and connections between said pistons and said lever. x

7. In a door check and closer, the combination with a casing and a spring-actuated member, of a split friction ring mountedin said casing and connected with said springactuated member, a lever disposed across said friction ring and provided with a cranked portion mounted between the adjacent ends of the split portion of the ring, and pneumatic means for controlling the operation of said lever to effect the application and release of the friction ring.

8. In a door check and closer, the commnation with a casing, and a spring-actuated member, of a split friction ring cooper-able, with the wall of said casing and connected with said spring-actuated member. operating means for expanding said ring, and pneumatic means connected with said operating means for controlling the expansion and contraction of said friction ring.

9.In a door-check and closer. the combination with a casing and a spring-tutti]ated member. of a split friction ring coiiperable with the wall of the casing and connected with said spring-actmited member. blocks secured to the adjacent ends of the split por-,

tion of the friction ring, a short shaft mounted between said blocks. a roller carried by said shaft to engage said blocks, a lever secured to said shaft, and pneumaticmeans connected with said lever for controlling the expansion and contraction of the friction ring.

10. In a door check and closer, the combination with a splitcasing, a spring-actuated member, and a friction brake member cooperable with the wall of the casing. of means for tightening the casing on said friction brake member, and means for controlling the operation of said brake member.

11. In a door check, the combination of a. casing, an arm adapted to be oscillated by the movement of a door, a brake adapted to resist the oscillation of said arm, and fluidcontrollcd means adapted to be actuated by the movement of said arm for regulating the application of said brake, substantially as described.

12. In a door check, the combination of a casing. a shaft therein, an arm connected to'= the shaft and adapted to be oscillated by the;

movement ofa door, a brake operatively associated with said shaft and adapted to resist the rotation of the shaft,"a-flnid cylinder and a piston, and means connecting said piston to the brake whereby the extent of appli-' cation of said brake is controlled, substantially as described.

13. In a door check and closer, the combination of a member adapted to be rotated by the movement of a door, a spring tending to rotate said member in one direction, a brake for resisting the movement of said member, a fluid cylinder and PlStOlL-zlfld means connecting said piston to said brake whereby the extent of application of said brake is controlled by the passage of fluid to and from the space in said cylinder in front of said piston. substantially as described.

14. In a door check, the combination with a spring-actuated member, of a friction device connected therewith, and fluid means for controlling the application and release a of said friction device.

15. In a door check, the combination with a spring-actuated member, of a fr ction device connected therewith, a lever for operatingsaid friction device, and fluid means connected with said lever for controlling the automaticapplication and release of said friction device.

16. In a door check, the combination with a springactuated member, of a friction device connected therewith, operating means for said friction device, and fluid means connected with said operating means for retarding the movement of the. latter to effect the application of the friction device during the intitial closing movement of the mechanism. 7

17 In a door check. the combination with a spring-actuated member, of a friction device connected therewith, operating means for said friction device, cylinders, pistons in said cylinders, valves for controlling the movements of said pistons, and means connecting both of said pistons with said op erating means.

18. In a door check, the combination with v a spring-actuated member, of a friction device connected therewith, a cranked lever for expanding said friction device, cylinders, pistons in said cylinders, valves for controlling the movements of said pistons, and rods connecting said pistons with said cranked lever. M p y 19. In a door check, the combination with a casing, and a spring actuated member of a split brake ring located withinsaid cas ing and connected with said spring-actuated member, a lever mounted in the space be; tween the ends ofsaid ring andhaving a crank disposed between the adjacent por ti'onsof said ring, cylinders on the casing, pistons in said cylinders, valves for con- Cbpiei this inay be olitdned for dye l I I v w tm 'i trolling the movements of said pistons and connections between said pistons and .said lever.

20. In a door check, the combination with a casing, and a spring actuated member, of

- a split friction ring mounted in said casing and connected with said spring-actuated member, a lever disposed across said friction ring and provided with a cranked portion mounted between the adjacent ends of the split portion of the ring, and fluid means for controlling the operation of said lever to effect the application and release of the friction ring.

21. In a door check, the combination with a casing, and a spring-actuated member, of a split friction ring cooperable with the wall of said casing and connected with said spring-actuated member, operating means for expanding said ring, and fluid means connected with said operatin means for controlling the expansion ant? contraction of said friction ring.

22. In a door check, the combination with a casing, and a spring-actuated member, of a split friction ring cooperable with the wall of the casing and connected with said spring-actuated member, blocks secured to the adjacent ends of the split portioniof the friction ring, a short shaft mounted between said blocks, a roller carried by said shaft to engage said blocks, a lever secured to said. shaft, and fluid means connected with said lever for controlling the expansion and .contraction of the friction ring. v

23. In a'door check, the combination with a split casing, a spring-actuated member, and a friction brake member cooperable with the wall of the casing, of means. for tightening the casing on said friction brake member, and means for controlling the operation of sa d brake member.

signed at Chicago, this 14th day of April, 1919, p p JOHN (J. SCHMIDT.

Witness &

T. D. Bo'rnnn. the Commissioner bi p a

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