TRACK-TYPE DOOR HOLD-OPEN DEVICE

Abstract: A door hold-open device (10) adapted to work with a conventional single-arm door closer(C)comprises a shoe(24) moveable along a track (12) and connected to the closer operating arm(A). A detent in the form of a wheel(88) is provided in the track which can be lowered through linkages (60, 80) by a solenoid (70) to engage the shoe. Spring pressure on the detent can be adjusted in the field. The detent holds the shoe at one end of the track so that the door is held open. But the door can be forcibly closed causing the shoe to raise the detent, or the solenoid can be deactivated to raise the detent.

Description: This invention relates to a selectively operable hold-open device for use with a conventional single arm door closer, according to the preamble of Claim 1. In the prior art there are a number of door holders adapted to be used with the single operating arm of a conventional door closer mounted on a swinging door for the purpose of holding the door open. One holder of the above-mentioned type is disclosed in U.S. Patent no. 4,286,412, which shows an hold-open device provided with a shoe having a latch-receiving recess and movable along a track; a movable frame is pivotally mounted adjacent the track and a latch, cooperating with said latch-receiving recess, is pivotally secured to the movable frame. A solenoid is disposed adjacent the track and is adapted to selectively assume an activated position to hold the frame with the latch in the path of the shoe in latch position. Typically, such devices are used in hospitals, for instance, whereby the door may be held open by the device until its power means are deactivated to release the door to permit it to close. Such an arrangement has been used in situation wherein in the event of fire, for instance, the door to a patient's room is automatically closed. An object of the present invention is to provide a hold-open device of the type indicted above with means for adjusting in the field the downward pressure exerted by the detent. A further object of the present invention is to provide a total reorganisation of the detent mechanism so that a relatively weak power means can selectively activate or deactivate the engagement of the detent, which requires great force to overcome. These objects are achieved in accordance with the present invention by hold open device of the above type, having the features stated in the characterising portion of Claim 1. One embodiment of the device according to the present invention will now be described with reference to the accompanying drawings, in which: - Figure 1 is a fragmentary perspective view showing a door associated with a holder of the invention. The door in this view is being opened; Figure 2 is a view similar to Figure 1 but wherein the door is fully opened and being held open by the holder of the invention; Figure 3 is a fragmentary sectional view taken on the line 3-3 of Figure 1; Figure 4 is a fragmentary bottom plan view; Figure 5 is an enlarged side view of the detent-activating subassembly; Figure 6 is a bottom view of the subassembly; Figure 7 is an enlarged view similar to Figure 3 but showing the shoe engaged and held by the detent as when the door is held open; Figure 8 is a view similar to Figure 7 but showing the shoe moving leftward as in a forcible close; Figure 9 is a view similar to Figure 7 but showing the shoe moving leftward, the solenoid shaft having been retracted; Figure 10 is a sectional view taken on the line 10-10 of Figure 7; Figure 11 is a fragmentary sectional view taken on the line 11-11 of Figure 8; and Figure 12 is a fragmentary sectional view taken on the line 12-12 of Figure 9. A door hold-open device embodying the invention is generally designated 10 in Figure 1. It is mounted on the frame F of a door D and to it is attached the arm A of a conventional door closer C. While the arrangement can be otherwise--that is, with the closer mounted on the frame and the device mounted on the door--the invention is well disclosed in the shown drawings wherein the hold-open device is frame-mounted. The hold-open device 10 comprises a combined track 12 and housing 14. Preferably this is in the form of an aluminum extrusion having a cross section (Figure 10) of generally inverted U-shape comprising a top wall 16, sidewalls 18, the opposed inward track flanges 20, and the support web 22. Slideably mounted for movement along the flanges 20 is the shoe 24. As shown best in Figure 10 the shoe is formed with grooves 26 in its opposite sides which receive the respective flanges. As is customary, the shoe is formed with a central bore 28 which is surrounded by a wheel 30 adapted to receive a pin (not shown) extending upward from the holder end of the arm. Also as is customary, the pin is formed with a groove to receive a forked retainer 32 slideably mounted near the top of the shoe. In practice the pin is inserted in opening 28 and the retainer is slid rightwardly so that its bifurcations fit into the opposite sides of the circumferential groove (not shown) in the arm pin. On its rightward end the shoe is formed with a simple horizontal web 34 in which is mounted a special hardened rivet 36 having a domed head 38 or nib for reasons which will appear. Bolted on top of web 22 within the housing 10 is the detent operator housing 40. As shown, the housing 40 is held in position by bolts 41, one of which is shown, extending through web 22. The housing 40 (Figures 5 and 6) comprises a bottom wall 42 and sidewalls 44. The sidewalls are slightly recessed as at 46 and receive an inverted U-shaped metal cover 48 (Figure 7) which snugly embraces the walls, fitting into the recesses 46 on both sides. As shown in Figure 5, the sidewalls are each formed with a pair of horizontal slots 50 and 52 which receive transverse rollers 54 and 56 for back-and-forth movement in the slots. A pin 58 is fixedly disposed in aligned openings in the two sides intermediate slots 50 and 52. A latching cam 60 is pivoted intermediate its ends on the pin 58. The cam 60 is formed at its opposite ends with a pair of downwardly facing shoulders 64 and 66 which as shown may engage the upper surface of the rollers 54 and 56, respectively. Preferably the shoulder 64 is inclined upwardly away from pin 58. Adjacent surface 66 is a perpendicular latching surface. A solenoid 70 is provided having a drive shaft 72 which when extended, as when activated electrically, urges the roller 54 rightwardly under shoulder 64. The movement of the roller 54 to the rightward position as shown in Figure 3 is facilitated by a partially inclined surface 74 above shoulder 64 (Figure 9). The roller 56 in its slot 52 is, during the extension of the shaft 72, also urged in a rightward direction by virtue of the incline 76 on the opposite side of the cam 60. On its rightward distal end, the latching cam is formed with a latching notch comprising perpendicular surfaces: a downward shoulder 66 and an outward vertical or perpendicular latching surface 67. Because the cover 48 is in place, the rollers are prevented from endwise movement out of the side walls 44. A detent wheel arm 80 (Figures 3, 7-9) is provided. It is of generally inverted U-shape in cross section (Figure 12). Intermediate its ends the side walls of the arm are apertured and receive a fixed pin 82 the outer ends of which normally rest on the web 22. The web is apertured as at 84 and permits passage of the wheel end of the arm 80. Mounted between the side walls at the lower end of the arm is a spindle 86 on which rides the detent wheel 88, which is disposed down in the area traversed by the shoe 24 (Figure 3). The opposite end of the arm includes extensions of the same parallel side walls of the U-shape structure and is apertured to receive the roller 56. As shown best in Figure 6, the bottom wall of the housing 40 is cut out to permit passage of the arm 80 including the detent roller 88, and the cut-out has lateral enlargements 90 to permit passage of the ends of pin 82. Completing the assembly is the pressure means 92 which works against the roller 88 to keep it urged downwardly. Pressure means 92 comprises a block 94 which is formed with a pair of spring-receiving bores 96 which receive a pair of springs 98. The springs 98 are compressed between their seats in block 94 and a bearing plate 100. Bearing plate 100 is supported adjacent an end block 102. Block 94 has a working head 94a. Both the spring block 94 and end block 102 are slideably supported within the cavity (Figure 11) between the web 22 and the flanges 20. The cavity is traversed by stop pins 104 and 105 mounted in side walls 18 and which are engaged in notches 108 and 110 on the block 102 and the spring block 94 respectively, limiting their outward movement. Blocks 94 and 102 are captured in the area defined by web 22 side walls 18 and flanges 20. For stability, guides 106 are fixed in the end block 102 and extend through apertures in the bearing plate 100 and into the respective springs 98. An adjusting screw 108 extends through the end block 102 and engages the rightward surface of the bearing plate 100 to adjust the pressure on the springs 98. Access to the head of the adjusting screw 108 may be had through an opening 110 in the end wall 112 of the device. In operation, with the solenoid activated and its shaft 72 extended, as is the normal condition, the latching cam 60 and the arm 80 are in the position shown in Figures 3 and 7. In this position, the latching surface 67 holds roller 56 in its rightward position and the detent 88 is urged down by contact with head 94a of block 94. In this position, the detent intercepts the path of the domed head 38 of rivet 36. Thus, when the door is opening (Figure 3) the shoe 24 moves rightwardly, and as the head or nib 38 engages detent wheel 88, it urges the latter upward against the bias of the springs 98 until the dome is on the rightward side of wheel 88 and the roller has returned to the position shown in Figure 7. It will be understood that during this process the block 94 is moved rightward, away from the pin 105 by which it is normally held from leftward movement. With the wheel down and head 38 rightward of the wheel, the door is in its most usual condition, namely, held open. From this position the door can be closed in one of two ways. First, it can be forcibly closed by manually pushing against the door adjacent its handle (not shown) to urge the shoe 24 leftward so that the dome (Figure 8) raises the detent against the bias of the springs 98. This operation is the opposite of the opening procedure wherein the detent wheel is urged upward as the shoe moves rightward. The second manner in which the door may be closed is for the solenoid 70 to be de-energized as would be done from a remote electrical control station--that is, the nurses' desk in a hospital, for instance--or by a smoke sensor which may be incorporated into the device but which is not part of the invention. Deactivating the solenoid 70 causes retraction of the shaft 72 (Figure 9) so that the roller 54 retreats, permitting the latching cam to rotate counterclockwise (Figure 9). This allows the roller 56 to move leftwardly as it slides against incline 76 and permits the domed head 38 to move the detent wheel 88 upward under no resistance at all. With the shoe moving leftward (Figure 9), as it is biased to do by the action of the closer C, the door assumes a closed condition. As stated earlier, the subsequent activation of solenoid 70 causes the shaft 72 to move rightward, and drives the roller down the incline 74 to engage shoulder 64. Simultaneously, incline 76 urges roller 56 rightward to establish a latched condition as it nestles against shoulder 66 and presses against its perpendicular latching surface 67 (Figures 3 and 7). With the holder in this condition the door is ready to be opened and held opened as described above in connection with Figures 3 and 7.

Claims: A selectively operable hold-open device for use with a conventional single-arm door closer, mounted on a swinging door, comprising: track means (12); shoe means (24) adapted to be connected to the distal end of the door closer arm (A) and to move along the track means (12), the shoe means (24) having upward detent-receiving means (38); detent means (88) cooperating with said detent-receiving means (38), movable between a latching position - wherein the detent means (88) is in the path of the detent-receiving means (38) - and an unlatching position - wherein the detent means (88) is off the path of the detent-receiving means (38) allowing the door to move freely from the open position; power means (70) associated with the detent means (88) and adapted to assume an activated position wherein said power means holds the detent means (88) in its latching position; the detent means (88) yielding toward the unlatching position both when the door is forcibly moved toward a more closed position from the open position and when the power means (70) assumes a deactivated position; characterised in that the detent-receiving means comprises an upward nib (38), and in that the hold-open device comprises: a) a latching cam (60) pivoted intermediate its ends on a pin (58) transverse to the track means (12), the cam having an incline (74) adjacent one end and an overhang on the other end presenting an outwardly and downwardly facing latching notch (66,67); b) a first roller (54) at the one end moved by said power means (70) against the incline (74) and adapted to move toward and away from the latching cam (60) and being supported to move against the incline (74) to pivot the latching cam (60); c) a detent arm (80) mounted adjacent the latching cam (60) and in line therewith along the track and extending down away from the cam (60); d) a second roller (56) pivotally mounted on the upper end of the detent arm (80) and adapted to move toward and away from the latching cam (60) and to butt against said latching notch (66,67) when the latching cam (60) is pivoted upon activation of the power means (70), said detent means (88) being placed on the opposite end of the detent arm (80) from the second roller (56); e) retaining means (82) keeping the distal end of the detent arm (80) from dropping toward the track beyond a certain distance; f) horizontally disposed compression spring means (98) mounted adjacent the track (12) in compression against the detent means, whereby the detent means (88) yields upwardly against the lateral force of the spring means (98) when the door is brought to the fully open position or forcibly moved toward a more closed position from the open position; and g) stop means (105) limiting the movement of the end of the spring means (98) toward the detent means (88). A door hold-open device as claimed in Claim 1 wherein the detent means is a wheel adapted to engage both the nib and the spring means. A door hold-open device as claimed in claim 1 wherein the latching notch comprises perpendicular surfaces. A door hold-open device as claimed in claim 1 wherein the detent arm is of U-shaped cross-section. A door hold-open device as claimed in claim 1 wherein the latching cam, the rollers and the detent arm are all mounted in a housing (40) having parallel side walls and the rollers are disposed in horizontal slots (50, 52) in the side walls of the housing. A door hold-open device as claimed in claim 1 wherein the nib is the hardened domed head of a rivet (36) mounted in the shoe. A door hold-open device as claimed in claim 1 in which the track is part of an extruded elongate body (14). A door hold-open device as claimed in claim 7 in which the track comprises inwardly facing aligned flanges (20) in the body. A door hold-open device as claimed in claim 8 in which the body has a horizontal web (22) above the flanges and the web has mounted on it a housing (40) enclosing the rollers, the latching cam and the detent means arm, and the web is apertured (84) to permit passage of the detent means arm downward into the path of the nib of the shoe as the shoe slides on the track. A door hold-open device as claimed in claim 9 wherein the housing also has mounted on it the power means. A door hold-open device as claimed in claim 1 wherein the spring means is adjustable (108) so that the force exerted by the spring in the detent may be changed. A door hold-open device as claimed in claim 1 wherein the spring means comprises at least one axial spring having an axis parallel to the track means.

Inventors: TEAGUE, RALPH TAGGART, JR.
Applicants: YALE SECURITY INC
Application year: 1987
Main classification: E05C17
IPC codes: E05B47, E05C17, E05F3