US3785004A - Door check attachment - Google Patents

Abstract

A device adaptable for attachment to a pneumatic or hydraulic door check unit, which serves to keep a fully opened door in that position, until subsequently released. The device consists of a latching mechanism in which a pivotably mounted hooked member is directed by lateral pressure of a trigger member responsive to the motion of the door into the position in which the hooked member will latch on the initial return stroke to retain the door in the open position. The latching effect on the hooked member creates lateral motion, such that upon further opening motion of the opened door, the trigger member acts to move the hooked member away from the latching position so that on the second return stroke, the hooked member is free of latching engagement, and permits the door to close.

Description

United States Patent [191 Stoffregen Jan. 15, 1974 [541 DOOR CHECK ATTACHMENT 1,188,996 4/1970 Great Britain 292 010. 4 [76] Inventor: Gunter Stoffregen, 16 Davis Downs Pl., Westhill, Ontario, Canada Gay Assistant Examiner-Peter A. Aschenbrenner F1led: Jan. 27, 19 AttorneyRobert L. Westell et al. [211 Appl. No.: 221,300

' [57] ABSTRACT 52 US.c1 16/49, 292/1310. 4, 16/66 A device adaptable for attachment to a Pneumatic or 51 Int.Cl E05f 3/00 hydraulic door Check unit, which Serves to keep a fully [58] Field ofSearch 16/49, 70, 85, 82, Opened door in that Position, unt l subsequently re- 16/66; 2 4 leased. The device consists of a latching mechanism in which a pivotably mounted hooked member is di- 5 References Cited rected by lateral pressure of a trigger member responsive to the motion of the door into the position in UNITED STATES PATENTS which the hooked member will latch on the initial reg t z et turn stroke to retain the door in the open position. n n s The latching effect on the hooked member creates lat- 2,8l7,554 12/1957 Hasselmark..... 292/DlG. 4 1509380 9/1924 Robertson 292mm. 4 eral mot1on, such that upon further openmg m0t1on of 1,114,675 10/1914 Blomeen 292 010. 4 the Opened door, the trigger member acts to move the 2,637,576 5/1953 Nottingham 292/1310. 4 hooked member y from the latching Position 89 1,493,794 5/1924 Robertson 292/D1G. 4 that on the second return stroke, the hooked member 265,919 10/1882 Elliott 16/66 is free of latching engagement, and permits the door FOREIGN PATENTS OR APPLICATIONS to close' 938,467 I/1956 Germany 292/D1G. 4 1 Claim, 7 Drawing Figures DOOR CHECK ATTACHMENT SUMMARY OF THE INVENTION This invention relates to a device for retaining a door in the opened position, while permitting the door to close under spring action, after a pulse of further opening pressure on the door.

An advantage of this invention is that the device may be installed, in parallel fashion, to an existing hydraulic or pneumatic door check device.

The device consists of an assembly which is adaptable to be mounted externally to the conventional tubular pneumatic or hydraulic door check unit. A movable slide member is fastened to the door check unit so as to slide longitudinally in response to the door movement. The slide member has a latch member integrally fastened to its mid-section inside the device, and terminates internally in a tapered pin which is longitudinally pointed inwards towards the external end of the slider. A hook member is loosely pinned inside the device with restricted motion in the longitudinal direction, but with free lateral travel, subject to a weak restraining spring.

In operation, opening of the door to which the device is attached creates longitudinal movement of the slide member, with the attached latched member brushing past the longitudinally fixed hook member, and moving the hook member laterally so that it will catch against the latch member on the return stroke of the slide member. When the door reaches the fully opened position, the latch member has completely passed the hook member, but the hook member is restrained from lateral motion by engagement with the tapered pin of the slide member. Thus, as the door is released manually from the fully open position, the hook member engages the latch of the slide member preventing further longitudinal motion of the slide member and restraining the door in the open position.

Further manual pressure on the door in the opening direction, frees the latch member from the hook member, but the hook member is now pushed laterally by the taper pin of the slide member to the position in which it is clear of engagement with the latch, so that the door is free to close.

BRIEF DESCRIPTION OF THE DRAWING The objects and features of the invention may be understood with reference to the following detailed description of an illustrative embodiment of the invention, taken together with the accompanying drawing in which:

FIG. 1 is a top plan view of the device mounted to a tubular door check;

FIG. 2 is a partial front view cross-section of the device;

FIG. 3 is an end view in cross-section taken at line 3-3 of FIG. 2;

FIG. 4 is a front cross-section of the device, with the attached door being opened;

FIG. 5 is a front cross-section of the device with the attached door fully opened, the door being manually held;

FIG. 6 is a front cross-section of the device with the attached door held by the device in the open position;

FIG. 7 is a front cross-section of the device with the sition,

DESCRIPTION OF THE PREFERRED EMBODIMENT:

Turning now descriptively to the drawing, in which similar reference characters denote similar elements through the several views, FIG. 1 illustrates thedevice 10 fastened byclamps 12 aroundlegs 16 of the housing of a conventionaldoor check unit 11, with slidingmember 13 of the invention fastened to thepiston rod 14 of thedoor check unit 11 by means of a mounting fastener throughcommon hole 15.

In describing the operation of thedevice 10, it will be presumed that thedevice 10 is fastened to a door which may be manually opened to the full travel of thedoor check 11 or the door itself, a state which will be called the fully opened condition of the door, and that spring means when manual pressure is released exist to close the door, subject to the restraining action of theinvention 10.

FIG. 2 and FIG. 3 illustrate thehook member 20 which is loosely fastened by rivetedpin 21 so as to pre vent longitudinal movement.Hook member 20 may move in a lateral direction, but is normally kept in parallel alignment to the axis of thedevice 10 bycoil spring 22. Hookmember 20 terminates at the free end in ahook 24.Washers 23, also pinned by rivet 21 on each side ofhook member 20, limit the angular twist with relation to rivet 21 that may be imparted to hookmember 20.

As shown in FIG. 4-7,slide member 13 moves longitudinally to the right, in the illustrations, when the attached door is being opened, and to the left when the attached door is being closed. Restriction of the motion ofslide member 13 in the closing direction by engagement withhook member 20 prevents closing motion of the attached door.

Shaped projectingcam 17, integrally fastened to slidemember 13, has a wedge shaped leadingedge 31 and a concavetrailing edge 32. The wedge shaped leadingedge 31 is set so as to interfere withhook member 24 and force thehook end 24 ofbook member 20 in a lateral direction against the reacting force ofcoil spring 22, when theslide member 13 is moving in the door opening direction, as shown by FIG. 5. After projectingcam 17passes hook member 20 in the door opening direction,hook member 20 is restrained from returning to its normal resting position by engagement ofhook member 20 withpin member 18 fastened to the end ofslide member 13, as shown by FIG. 5.

Upon initial release of the fully opened door, FIG. 6 illustrates the manner in which thehook member 20, released from engagement withpin 18, starts to laterally return to its normal position parallel to the longitudinal axis of thedevice 10, buthook member 20 is latched by the concavetrailing edge 32 ofcam 17 on the reverse stroke ofslide 13, preventing further closing motion ofslide member 13 and the attached door.

Manually directed pressure on the door again towards the fully opened position, as seen in FIG. 7, reengagespin 18, attached toslide member 13, withhook member 20, but because of the location of the taper 37 oncam 17 and the point of 34pin 18, with relation to the concavetrailing edge 32 ofcam 17,pin 18 now engageshook member 20 so as to laterally move it away from interference withcam 17 and in the direction of its normal'resting'position determined bycoil spring 22. Consequently,'upon manual release of the door,

slide member 13 and the door are free to return to the closed position, withwedge section 33 of the trailing edge ofcam 17 pushinghook member 20 laterally away from interference withcam 17 on the return door closing stroke.

Since obvious changes may be made in the specific embodiment of the invention described herein, it is indicated that all matter contained herein is intended as illustrative and not as limiting in scope.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. A latching device, for attachment to a door check unit having a cylinder element and a piston element, and serving releasably to secure a door in an open position, comprising:

a pair of parallel elongated members comprising a cam carrying member attachable to one of the elements of the door check and a hook carrying member attachable to the other element of the door check, the two members being longitudinally slidable extendably or retractably one with respect to the other when the door check is extended or retracted;

the cam carrying member having fixed thereon a planar cam having a sloping leading edge, a concave trailing edge, and a pair of lateral edges defining the cam width;

the hook carrying member having an elongated hook element loosely mounted thereon for lateral pivotable movement with respect to the longitudinal sliding direction of the members against spring biasing means urging the hook member into a laterally offset position within the cam width, the hook element having a hook projecting laterally into the plane of the cam;

whereby (l) on initially extending the members the hook engages and rides over the leading edge of the cam against the action of the hook biasing means and the spring biasing means urges the hook laterally to engage the concave trailing edge of the cam on retracting the members to restrain the members from further retracting, and (2) on extending the members again the hook emerges from the concave trailing edge of the cam and the spring biasing means urges the hook laterally therefrom allowing the members to be fully retracted;

the latching device further including an elongated pin member lying in the plane of the cam and oriented in the sliding direction of the members, the pin being spaced rearwardly from the concave trailing edge of the cam, whereby the hook rides along the pin when overshooting the cam on the initial extension of the members and drops into the concave trailing edge of the cam on initial retraction of the members;

the hook carrying member further comprising a channel and the cam carrying member a bar slidable along the base of the channel, the hook element being mounted on the channel above the base thereof by a transverse rivet passing loosely through the hook element, a compression coil spring being carried by the pin on one side of the hook element, the spring bearing against the hook element and against the side of the channel.

Claims (1)

1. A latching device, for attachment to a door check unit having a cylinder element and a piston element, and serving releasably to secure a door in an open position, comprising: a pair of parallel elongated members comprising a cam carrying member attachable to one of the elements of the door check and a hook carrying member attachable to the other element of the door check, the two members being longitudinally slidable extendably or retractably one with respect to the other when the door check is extended or retracted; the cam carrying member having fixed thereon a planar cam having a sloping leading edge, a concave trailing edge, and a pair of lateral edges defining the cam width; the hook carrying member having an elongated hook element loosely mounted thereon for lateral pivotable movement with respect to the longitudinal sliding direction of the members against spring biasing means urging the hook member into a laterally offset position within the cam width, the hook element having a hook projecting laterally into the plane of the cam; whereby (1) on initially extending the members the hook engages and rides over the leading edge of the cam against the action of the hook biasing means and the spring biasing means urges the hook laterally to engage the concave trailing edge of the cam on retracting the members to restrain the members from further retracting, and (2) on extending the members again the hook emerges from the concave trailing edge of the cam and the spring biasing means urges the hook laterally therefrom allowing the members to be fully retracted; the latching device further including an elongated pin member lying in the plane of the cam and oriented in the sliding direction of the members, the pin being spaced rearwardly from the concave trailing edge of the cam, whereby the hook rides along the pin when overshooting the cam on the initial extension of the members and drops into the concave trailing edge of the cam on initial retraction of the members; the hook carrying member further comprising a channel and the cam carrying member a bar slidable along the base of the channel, the hook element being mounted on the channel above the base thereof by a transverse rivet passing loosely through the hook element, a compression coil spring being carried by the pin on one side of the hook element, the spring bearing against the hook element and against the side of the channel.

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