US534999A - Door-check - Google Patents

Description

(No Model.) 3 Sheets-Sheet 1.

W. GILPILLAN. DOOR CHECK.

No. 534,999. Patented Mar. 5, 1895.

(No Model.) 3 Sheets-Shee-t 2.

W. GILPILLAN.

DOOR CHECK. No. 534,999. Patented Mar 5, 1895.

lmmrr" (No Model.) 3 Sheets-Sheet 3.

W. GILFILLAN.

DOOR GHEGK.

amnion 9 9 a; M J N w 4 NGTON. D. c.

( view of the piston and vent tube.

rrnn STATES PATENT OFFICE.

WILLIAM GILFILLAN, OF NEW BRITAIN, CONNECTICUT.

DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No. 534,999, dated March 5,1895.

Application filed March 31, 1 8 92. Serial No. 427,257. (No model.)

To aZZ whom it may concern:

Be it known that I, WILLIAM GILFILLAN, of New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Door- Checks; 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.

My invention relates to an improvement in door checks, and consists in the features of construction and combinations of parts hereinafter described and pointed out in the claims.

In the accompanying drawings, Figure 1 is a View in side elevation of my improved door check attached toa door. Fig. 2 is a vertical section of the device. Fig. 3 is a view in perspective of the piston. Fig. at is-a similar view of the rotary disk. Fig. 5 is a detached Fig. 6 is a detached view of the spring thimble. Fig. 7isa detached View of the spring arbor sleeve. Fig. 8 is a view of the door check when constructed without a spring casing or spring. Fig. 9 is an enlarged view in cross-section of the vent tube and rotary plug valve. Fig. 10 is a plan view of the piston showing an outline of the rotary disk. Fig. 11 is a view in side elevation of the stufflng box gland.

A represents a liquid chamber or receptacle which is shown cylindrical in form though it may be rectangular,polygonal or of any other desired shape in cross section.

Head B is preferably cast integral with the chamber while the opposite head Cis screwed into the open end of the chamber and hence is readily removable for the insertion of the piston. A filling hole a is formed in the removable head through which the checking liquid may be inserted and which is retained against escape by the screw plug 0.

D is a spring casing, preferably cast integral with the liquid chamber though it desired such parts may be made separate and suitably secured together. This chamber is provided with ears or flanges 0b a which are perforated as at a, for the reception of screws for fastening the chamber to the door or door-casing. The cap D of the spring casing, is constructed with an upwardly projecting boss (1, which serves as a bearing for the sleeve E which latter is supported by the ratchet wheel E cast on its upper end and resting upon the upper end of the boss.

F is a spindle which extends through the sleeve E, and its upper and squared end f has secured thereto one end of the link which is composed of the sections 6 c pivotally connected together at a G is a spring which is provided with a retaining band 9 to which is fastened a plate which fits into a vertical slot formed in the spring casing whereby the outer end of the spring is removably secured to the spring casing. I have not deemed it necessary to illustrate in the drawings this method of fastening the spring to the casing as it forms no part of this invention, and has already been disclosed in a patent granted to me on door checks. By this construction of parts the position of the spring may be readily reversed, thus rendering the door check adapted for use on right or left hand swinging doors.

The lower portion of sleeve E is flattened on its oppositesides for the engagement of similarly flattened sides g formed on the inside of the thimble 9 whereby the latter will be rotated with the sleeve. On the periphery of the thimble is formed an inclined tooth g which engages in the hole 9 formed in the inner end of the spring. When the sleeve and thimble are turned in one direction; that is, in a proper direction to wind up the spring, the tooth on the thimble engages in the hole formed in the inner end of the spring, but should the sleeve be turned in the opposite direction, the tooth on the thimble will be disengaged from the spring whereby the latter will be protected against breakage or injury. The thimble is readily removed and is v reversible so that it may be applied for use in connection with the spring arranged either for a right or left hand door check.

1-1 is a packing plate the periphery of which is screw threaded the latter engaging corresponding screw threads h formed in the lower end of the spring casing, or in the upper por tion of the liquid chamber. An annular seat or ledge h is formed in the casing and against this seat the packing plate is firmly screwed. The lower end of spindle F is seated in a bearing h formed in the packing plate.

ICO

A stufling box I projects upwardly from the packing plate and is preferably cast integral therewith. The outer surface of the stufing box has formed thereon a not It to allow of the application of a wrench to screw the packing plate home and to unscrew it when necessary. The gland I is screw threaded at its lower end and engages corresponding screw threads on the inner surface of the stuffing box. Holes t'any desired numberare formed in the gland and extend through it. Within these holes suitable inbricating material t" is packed which serves to lubricate the lower end of the spindle.

J is a piston the end or head j of which snugly fits the bore of the liquid chamber. If desired the piston maybe provided with anysuitablepacking. Kisaraceway formed in an extension of the piston and is preferably cast solid with the shell K. Headj is constructed with a hole 7" over which is located a lift valve L, the latter having connected therewith any desired number of guide pins k which extend through holes 7r formed in the head of the piston. The guide pins fit loosely within holes 7c so that they may not only slide freely to and fro therein, but have a slight lateral movement and thus enable the valve to adjust itself laterally for a purpose hereinafter explained.

M is a venting tube, which is screwed into the end or head B of the liquid chamber, so that the tube projects into the latter. The tube is gradually tapered from the point m to its inner end, while its outer end is constructed with a vent hole m and with an annular groove m the latter being considerably wider than the thickness of the lift valve. The venting tube from the point m to the groove m is straight or without taper. \Vithin the venting tube is located a rotary plug valve 11, which in form is such a section of a cylinder that it may be turned so as to completely close the hole m or may be adjusted so as to vary at will the size of the liquid passage through the vent hole to theinterior of the tube. The outer end of the rotary plug valve is furnished with a button m by which it may be easily adjusted. As shown in the drawings, lift valve L is provided with a hole Z through which extends the vent tube M.

N is a rotary disk secured to the lower end of spindle F, and constructed to snugly fit and seat itself upon the annular seat n formed in the casing or chamber below the packing ring. Upon the under side of the rotary disk is formed an eccentric disk N which is provided with a stud pin N It is evident that these several parts might be constructed separately and be fastened together. Stud pin N enters the hole 0 formed in the racebox 0' the upper face of which is flush with and in the same plane as the upper and hearing faces 0, 0' of the race way. The lower face 19, of the eccentric disk is planed off, and is of such area that it will at all times rest upon and engage the upper face or hearing of the race-box O and the bearing faces 0 0 of the race-way.

I will now briefly describe the operation of my improved door check.

When the parts are in the position illustratedin Fig. 5, the door is swung wide open and will be closed and its speed regulated and controlled by the action of the doorcheck. In swinging the door to its open position piston J is moved from left to right and the liquid contained in the liquid chamber will flow through the holej in the head of piston and past the lift valve which latter will be forced into its open position due to the pressure of liquid against its inner face when the piston is moved in the direction stated. Hence by the act of opening the door, the checking liquid is caused to flow through the hole in the head of the piston and fill the space between the latter and the end of the liquid chamber. As the door commences to close the spring of the door check will act to move the door rapidly during a part of its movement in closing, such rapid movement being permitted by the check. It will be observed that when the door commences to close, the confined liquid between the head of the piston and the closed end of the liquid chamber, will flow through the vent hole and venting tube to the opposite side of the piston, and will also flow through the annular passage formed between the tapered end of the venting tube and the walls of the hole in the lift valve and through which the venting tube extends. This annular passage will gradually be restricted in area as the piston moves toward the right, and will be practically closed when the piston has moved such a distance that the valve covers the point m on the venting tube. During the movement of the piston from this point, until the valve L has reached the annular groove m the escape of the liquid will be practically restricted to its passage through the vent hole m and hence the speed of the door will be gradually checked until it has swung almost closed; but just before the door has reached its closed position and when its speed has been reduced to its minimum, the valve L will pass over the annular groove m and as the latter is of greater width than the thickness of the valve, the liquid which is still confined between the piston and end of the chamber, will freely escape through the annular groove and past the valve and flow to the opposite side of the head of the piston. This sudden release of the checking medium, allows the spring of the door check to exert its force in closing the door with sufficient force to insure its latching.

The speed of the door in closing may be regulated, by varying the adjustment of the rotary plug valve and thereby varying the size of the vent hole m. The sudden release of the checking fluid and allowing the spring to close and latch the door, may be regulated so that the door will be released to the action of the spring at any desired point in its movement. This may be done by varying the adjustment of the vent tube, that is to say, by screwing the vent tube farther into the chamber, the release of the door to the action of the spring will take place earlier than when the vent tube is adjusted so that valve L will not reach the annular groove until the door has swung into an almost closed position.

The vent tube throughout a portion of its length fits quite snugly within the central hole in the lift valve, and hence in order to prevent the latter from binding or injuring the vent tube, its guide pins are fitted within the piston head so that they will slide freely, but will also have a slight lateral movement in their holes and thus permit the lift valve to have sufficient lateral movement to accommodate itself to the vent tube.

The rotary disk on the lower end of the spindle gives the lower end of the latter a broad and extended lateral bearing and thereby restrains it against lateral motion and wear, while the extended flat bearing surface on the under side of the eccentric disk operates to maintain the race-box in position and insures a perfectly smooth working of the device.

In Fig.8 I have represented the check when constructed without a spring, in which case the packing disk constitutes a portion of the wall of the liquid chamber. Door checks thus constructed are exceedingly simple in their construction and may be used in connection with a separate and independent door spring of any desired form and construction.

I do not restrict my invention to the particular construction and arrangement of parts shown and described, but,

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

1. A door check comprising a liquid chamber, a reciprocating piston, a valved port in the piston, a vent tube extending through the piston and provided with a tapering surface whereby the piston is gradually checked as the door commences to close, and an adj ustable valve for regulating the flow of liquid through the vent tube.

2. A door check comprising a liquid cliam ber, a piston adapted to operate therein and a vent tube extending through the piston said vent tube being provided with a port and a cut away portion adjacent to the port whereby the door when nearly closed will be suddenly released to the action of the spring and its latching thereby insured.

3. A door check comprising a liquid chamber a reciprocating piston adapted to operate therein a valved port in the piston, a vent tube connected with the liquid chamber and extending through the piston said vent tube being provided with a port and a cut away portion, and an adjustable valve for regulating the flow of liquid through the vent tube.

4. A door check comprising a liquid chamber, a reciprocating piston and a vent-tube tapcred throughout a portion of its length, substantially as set forth.

5. A door check comprising aliquid chamber, a reciprocating piston and a vent tube provided with an adjustable rotary plug valve, substantially as set forth.

6. A door check comprising a liquid chamber, a reciprocating piston, and a vent tube provided with an annular groove, substantially as set forth.

7. A door check comprising aliquid chamber, a reciprocating piston constructed with a race way, a spindle, eccentric disk and stud pin and a race box, substantially as set forth.

8. A door check comprisinga liquid cham ber, a reciprocating piston constructed with a race-way, a race box arranged in the raceway, and an eccentric disk provided with a stud pin which engages the race-box, the eccentric disk being provided with an extended bearing that engages the race box and raceway, substantially as set forth.

9. A door check comprising a liquid chamber, a reciprocating piston having a race-way and race-box, a spindle arranged at right angles to the line of movement of the piston; a rotary disk, an eccentric disk and stud pin connected with the lower end of the spindle, substantially as set forth.

10. A door check comprising aliquid chamber, a reciprocating piston, a spindle arranged at right angles to the line of movement of the piston and a packing disk having a stuffing gland constructed with holes adapted to be filled with lubricating material for lubricating the lower end of the spindle, substantially as set forth.

11. A door check comprisingaliquid chamber and a reciprocating piston, aspring cham ber and spindle the latter being arranged at right angles to the line of movement of the piston and connected therewith, of valve mechanism for allowing the liquid to escape past the piston when the door is opened, and for gradually checking the escape of liquid through the piston as the door is closed, and for suddenly releasing the door to the action of the spring when the door is nearly closed and thus insure its latching, substantially as set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

WILLIAM GILFILLAN.

Witnesses:

GEO. F. DOWNING, S. G. NOTTINGHAM.

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