US1266864A - Door check and closer. - Google Patents

Description

J. C. SCHMIDT.

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DUUR CHECK AND CLOSER` APPucAmJN FILED sEPI. I. lan.

1,266,864. Patented Muy 21,1918.

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Speoioetion of Letters Patent.

Patented May 21, 1918.

Application iled September 7, 191'?. Serial No. 190,231.

To all whom, t may concern.'

Be it known that I Jol-INC. SCHMIDT, 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.

his invention relates to improvements in door checks and c1osers,-one object of the invention being to provide an eflicient device of this character in which the use of liquid and the disadvantages incident thereto shall be avoided, and which shallV depend for its accuracy of o ration upon pneumatic and friction brae means A further object is to so construct a door check 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 doo A further object is to so construct a door check and closer employin pneumatic means that the vacuous condition produced will control the first half of the closing movement of 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 friction brakemeans, in which compression. of air and vacuous condition will control the a plication and release of the friction b e devices.

A further object is to provide simple and the parte to any desi position.

With these and other obects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings; Fi 1 is a view in elevation of a door ch and closer embod inp` mjy invention Fig. 2 is a top plan view of the same; li`ig. 3 is a longitudinal sectional view; Fig. 4 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;

hold the door in and closer that no resistance will beV n 1s mounte to engae of said blocks when the s ort shaft is turned nular A 9 are detail views.

1 represents a casing provided with cylinders 2, 3, which are disposed diametr-ically opposite each other and communicate with the interior of said casing. v

A friction element is located within the casing 1 so as to coperate with the wall thereof and is connected with and controlled by the operation of pistons 4, 5 in the respective cylinders 2, 3,-said friction element being connected with said pistons by means of piston rods G, 7. The plstons 4, 5 are provided with cheek 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 de ree of compression in one of them and the egree of expansion or vacuum in the other.

In the present instance, the friction element above referred to comprises a s lit or divided brake ring 10 brake band 1l to eng e the inner wall of the casing 1. Locat within the space formed by dividing the brokering are two recessed blocks 12, 12. These blocks .are secured to the adjacent ends of the clutch ring and in effect, constitute parts of the same. A short shaft 13, mounted between the blocks 12, is provided with laterally projecting lu 14, between which a roller 15 so as one or the other and thus o` erate to expand the brake ring and cause rictional engagemen't of its band 11 with the inner wall o the casing 1. An arm or lever 16 is secured to one end of the short shaft 13 and projects across the brake ri?, said leverbeing provided at its free en with a wrist gin 17 towhich the two piston rods 6 and are pivotally attached. t will be observed that with theconstrucf tion above described, the short shaft 13 with the roller 15 mounted thereon constitute a crank on one end of the lever for expanding the clutch ring when said lever is moved. The clutch ring is disposed under an anshoulder 18 within the casing 1 and located within said brake rinland suitably inned thereto so as to turn erewith, is a. isk 19 from which a spindle 20, made. rigid provided wit a 'of t e door,-the valves in said pistons Ving with the same, projects upwardly and .passes through an opening in a ca 21 on said casing. A ring 22 is locate within the casing 1 an the wall of the casing is made with a slot 23 to receiveJ lugs at the outer end of said spring. 'A sleeve or sprin winder 24 is mounted on*4 e spindle 20 an is provided with a slot 2 to receive lugsuon the inner end of the sprin The sleeve or winder 24 passes freely t rough the hole in the cap 21 and is provided at its upper end with a notched head 26 to receive a pawl 27 mounted on a lever 28 secured to the upper end ofr the spindle 20. An extensible arm ,29V is loosely coupled at one end to the lever 28an'dat its other end, this arm is loosely coupled to a suitable bracket 30 to be secured to the door frame.

It is apparent that when the door is o ened, motion will be imparted through t e lever 28 to the spindle 20 and the spring 22 to wind the latter and tur-n the rake ring 10. The casing 1 is split as at 31, and the adjacent edges are provided with perforated llugs 32-33 throu which a bolt 34' passes. A portion of t is bolt may be contracted somewhat in size and is threaded to receive a nut '35 which bears a ainst the lug 32. The larger portion of t e bolt is threaded and receives the internally threaded head of a lever 36,-a suitable ring or washer 37 being disposed between the lever head and the lug 32 on the casing. A portion ofthe bolt 34 is flattened to receive a set screw 38 mounted in the lug 33 to prevent movement of said bolt. The lever 36 may be provided with a foot 39 to rest upon the casing when said lever is in its normal position. By turning the lever 36 on the threaded bolt 34, the casing will be contracted somewhat and caused to tightly clamp the brake ring to lprevent the same from turning. The mechanism may be locked in this manner to prevent movement of the door and thus the door may be held in any desired position. for wear between the band of the brake ring and the casin the bolt 34 may be adjusted longitudine 1y.

In the o erationV of my improvements, no resistance is offered by the movements of the istons in the cylinders to the openiig eas to permit free movement of said pistons during the opening movement of the door. The spring will be permitted to exert its full strength during the closing movement of the door and this closring movement is controlled biyL the automatic applicationand release of t e brake as effected by' the retardation and release of the pistons 1n the cylinders. L When the door is being o cned, the spring 22 will be wound and its orce will be apso arranged plied to cause the closing of the door when ment of the door 1s under the contro In order to compensateV the latter him been released.' When the door is bein closed by the a plication of the force o the spring 22, t e clutch ring 10 will be turned and power will be ap lied to the pistons. At the beginning of t e closing movement of the door the pistons cannot move freel because a vacuous condition will b'e create in one of the cylinders and air willgbe compressed in the ot er cylinder. Such retardation of the movement of the pistons as compared to the force of the spring 22 `tendin t e lever 16 to e turned slightly and its crank to expand the `clutch ring, as previously explained. This application of the ,brake will cause a retardation of the closreason of the vacuous condition created in the cylinder 2. As the door approaches its closed lposition, the patent compression of air int e cylinder 3 will cause the final portion of the closin movement of the door to be retarded su ciently to prevent slamming.

From the above description, it will be seen that the first half of the closing moveof the vacuous condition created in the cylinder 2; that the last portion of such closing movement is under the control of compression of air in the cylinder 3, and that the varying resistance offered by the pistons will automatically control the application and release of the friction brake.

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 springactuated 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 pneumatic means 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 retardi-ng the movement of to move them, will cause the latter to effect the application of the friction device durin the initial closing movement of the mec anism.

4. In a door check and closer, the combination with a spring-actuated member, of a friction device connected therewith, o eratin means for said friction device, a ining cy inders, 1plisltons in said cylinders, valves for contro g the movements of said pistons, and means connecting both o f said pistons with said o erating means.

5. In a door c eck and closer, the combination with a spring-actuated member, of a friction device connected therewith, a cranked lever for expanding said friction device, al' cylinders, pistons in said cylinders, valv for contro in the movements of said pistons, and regs connecting said istons with said cranked lever.

6. n a door check and closer, the combination with a casing, and a s ring actuated member, of a s lit brake I'in ocated within said casing an connected wlth said springactuated member, a lever mounted 1n the split portion of said ring and having a crank disposed between the adjacent portions of said ring, alinin cylinders on the casin pistons in said cy inders, valves for contro?- ing the movements of said pistons and connections between said pistons and said lever.

7 In a door check and closer, the combination with a casin and a spring actuated member, of a s lit riction ring mounted in said casing an connected with said springactuated member, a lever disposed across said friction ring and provided with a cranked portion mounted etween the adjacent ends of the split portion of the ring, and pneumatic means for controlling the 8. In a door check and closer, the combination with a casing, and a spring-actuated member, of a split friction ring coperable 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 an contraction of said friction ring.

9. In a. door check and closer, the combination with a `casing and a spring-actuated member, of a split friction ring coperable with the wall of the casing and connected with said s ring-actuated member blocks secured to e adjacent ends of the split 'portion 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 pneumatic means 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 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 controllinthe operation of said brake member.

testimony whereof, I have signed this specification in the presence of two subscribing witn ,W. R. BAUM,

Gnonen F. DowNnaG.

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