Patent GB-190314809-A (GB)
Title: Improvements in or relating to Door Springs and Checks.
Inventor: ADAMS ROBERT
Filed: 1903-07-03
Granted: 1904-05-12
Abstract: 14,809. Adams, R. July 3. Door - closing apparatus ; door checks.-Relates to single and double acting door springs combined with door checks. Fig. 1 shows a doubleacting spring in which the transverse as well as the axial resilience of the spring d is utilized. The door pivot a has two pins or rollers a<1> engaging recesses b<1> in the plate or bar b, between which and the plate c the spring d lies. Auxiliary springs t assist in starting the closing action. The plate b may be integral with the rod b<2> sliding in the pivoted socket b<3>, or it may slide upon a plate fixed to the end of the spring d. The spring is preferably of elliptical section and may contain one or more smaller spiral springs, by means of which the pressure of the two sides is adjusted. The plate b or the plate c may be adjusted to secure alignment of the door by the worm e<1>, Fig. 6, engaging teeth on the curved part of the plate, or the plate may be adjusted by means of screws bearing against the walls of the box. As shown in Fig. 7, the plate b works on the recessed plate e, or may be pivoted at e<6>, and is adjusted by screws f. The plate c may be adjusted to alter the pressure of the spring, or to compress one side more than the other, by means of wedges g, Fig. 8, acting against the inclined surface g<1> on the box, and locked in position by teeth g<2>, keys, or other means ; or plugs may be inserted between notches on the plates c, g<1>. The plate c may be formed with a rack c<1>, Fig. 11, in gear with a pinion i, or a worm, to adjust the pressure of the spring, or screws and nuts may be used for the same purpose. Two separate springs d may be used, adjustably secured to the plate c, part of which may be set at an angle to the other part by wedges or other meaus. Fig. 13 shows a modification in which the pins or rollers a<1> engage the two plates e, e<5>, each of which has a fulcrum in the wall of the box and compresses one side of the spring d, or each plate may act upon a separate spring. The butt end a<2> of the pivot may act upon the up-turned end of the plate e to start the closing of the door when it has rotated through nearly 90‹. The plates e, e<5> may be linked together to act simultaneously. Fig. 15 shows a modification, containing a double-armed lever k, pivoted at k<1>, operated from the pivot a by the arm a<3>, and connected by links l to the levers e acting upon the springs d. The roller a' acts upon the inner faces of the lever k. In the Provisional Specification, it is stated that a pair of studs or rollers may act upon the outer faces. Fig. 16 shows a modification, in which the V-shaped plate e, in contact with the spring d, is acted upon by thrust arms m, which may be in one piece or may be pivoted or united to one another or to the apex of the plate e. Stops m<1> and, if necessary, springs are employed to restore the arms m to the normal position. If the door be required to open through more than a right-angle, additional recesses b<1> are formed on the arms m, engaging pins on the pivot, or the recess a<5> is formed on the pivot to act on the end of the arm, or the engaging surfaces of the pivot and arms may be toothed to continue the closing action through more than 90‹. Similar devices may be applied to the spring shown in Fig. 1. The spring, instead of being compressed by a thrust, may be pulled from the back by a chain and rod, the chain winding upon a cam-surface on the pivot when the door is opened. Such a chain may be used solely for the purpose of operating the piston-rod of the door check. Fig. 19 shows a modification, in which the plates e have fulcrums p in the walls of the box and are connected to the arm a<3> on the pivot a by links n, n<2>. Projections n<3> limit the motion of the links n<2>. The links n are curved to embrace the pivot a. Adjusting-screwsf are provided. The plates e have preferably a number of recesses to receive the spring points or edges d' for the purpose of adjusting the spring d. The apparatus is modified for singleacting doors. Fig. 21 shows the preferred construction of the spring d. The threaded stem d<4> on the part d' enters the socket d<5> on the part d<3>, and is engaged by the nut d<6>, by which the tension is adjusted. The edges d<7> prevent the parts d', d' from rotating when in position. When it is required to dismount the spring, a pin is passed through the openings d<8>, d<9>, locking the stem and socket together. The door checks described in Specifications No. 20,793, A.D. 1898, Figs. 1, 2, and 3, and No. 3448, A.D. 1900, Figs. 1 and 2, are preferably used in combination with the door springs. Fig. 22 shows a modification of the apparatus shown in Fig. 6 of Specification No. 3448, A.D. 1900. The-cam lever h<1>, pivoted at s, is provided with cam-guides r, r<1> to check the homeward run of the roller or stud a<7>. The check piston-rod is attached to the pivot h<2>. The guide r<1> is preferably provided with the flat spring r<3> fixed at the end r<3> and supported at the bend r' by the spiral spring r<5>.