WO1996012077A1 - Stopper against cylinder rod's retraction - Google Patents

Stopper against cylinder rod's retraction Download PDF

Info

Publication number
WO1996012077A1
WO1996012077A1 PCT/CA1994/000568 CA9400568W WO9612077A1 WO 1996012077 A1 WO1996012077 A1 WO 1996012077A1 CA 9400568 W CA9400568 W CA 9400568W WO 9612077 A1 WO9612077 A1 WO 9612077A1
Authority
WO
WIPO (PCT)
Prior art keywords
cylinder rod
locking
onto
parts
cylinder
Prior art date
Application number
PCT/CA1994/000568
Other languages
French (fr)
Inventor
Wai Cheung Lee
Original Assignee
Wai Cheung Lee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wai Cheung Lee filed Critical Wai Cheung Lee
Priority to PCT/CA1994/000568 priority Critical patent/WO1996012077A1/en
Priority to AU78504/94A priority patent/AU7850494A/en
Publication of WO1996012077A1 publication Critical patent/WO1996012077A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/02—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means
    • E05C17/04—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means with a movable bar or equivalent member extending between frame and wing
    • E05C17/30—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by mechanical means with a movable bar or equivalent member extending between frame and wing of extensible, e.g. telescopic, construction

Definitions

  • This invention relates to a device used for stopping the retraction of cylinder rods.
  • cylinders' rods usually do not have a secure mean of retraction stopping.
  • spring closer for storm door usually just a small metal piece, sliding on the central rod is provide for stopping the retraction of the cylinder rod of the spring closer.
  • this metal piece is coated with dirty oil from the central rod of the cylinder so quite certain people will have to clean their hands after touching it. Also this metal piece is difficult to be placed properly especially by elderly people. Further ⁇ more, once the storm door has a slight movement, the metal piece may not be able to hold the door opened any ⁇ more.
  • the stopper For the contacting place of the stopper to the cylinder rod, it can be vee, saw-teeth, circular or corrugated shape when looked from the direction as the axis of the cylinder rod so that the stopper can grasp on the surface of the cylin ⁇ der rod much better.
  • the stopper can be pressed onto the cylinder rod by some mechanical arrangements, some linkages or as in the simple form shown here, by turning a screw to press the stopper firmly onto the cylinder rod.
  • the stopper can also be activated by a spring so as to pull it against the sur- face of the cylinder rod. Then as the rod retracts, the stopper plate or cam will be drawn towards the cylinder thus make it jammed even more onto the cylinder rod.
  • the stopper When the stopper is moved to the release position as desired, it can be activated by a spring, may be the same spring for locking purposes to keep it in the release position.
  • the locking and releasing can be done through some linkages, strings, levers or buttons according to different desires.
  • Most of the stoppers for lockin ⁇ i show. here are single plate or single cam presses on the cylind- er rod, however, the stoppers can also be constructed so that two opposing plates or cams press onto the same position on the cylinder rods on both sides so as to enhance even more secure grasping on the cylinder rods.
  • Fig. 1 and Fig. 2 Show the side views of the cylinder when the locking part is in the form of a plate or cam respectively .
  • Fig. 3 ⁇ , 3D, 3C, 3D, 3E and 3F show the shape of the contacting end of the locking part onto the cylinder rod when viewed from direction A in Fig. 1 or direction B in Fig. 2. They are being flat-end, vee, saw-teeth, circular, multi-circular and corrugated respectively.
  • Fig. 4, 5 and 6 are the sectioned end view, elevation and isometric view of the construction when using a plate as the locking part.
  • Fig. 6 shows the retraction stopper being installed onto the cylinder.
  • Fig. 4 shows the sectioned end view, elevation and isometric view of the construction when using a plate as the locking part.
  • Fig. 6 shows the retraction stopper being installed onto the cylinder.
  • a locking part 2 which has one end being hold by clip 3 and the other end touches the cylind ⁇ er rod at a small inclined angle to the vertical will be pressed onto the cylinder rod 4 and stops the rod from retractin ⁇ back into the cylinder.
  • Item 5 & 6 are the bolt and nut sets for fastening the retraction stopper onto the cylinder.
  • Fig. 7, 8.& 9 are the end view- elevation and exploded view when two cams are used for stopping of the cylinder rod's retraction.
  • Fig. 7 when the lever of a cam 7 is pushed in the direction E until the cam touches the surface of the cylinder rod, it will be kept in that lock ⁇ ing position by an expansion spring 8 which tends to expand.
  • another cam 9 will has been activated by the cam 7 through the spring 8 to move into its lo kinq position as in Fig. 7.
  • Fig. 10A and 10B show linkages are used for the operation of the locking parts.
  • a tension spring 12 keep the locking part in a released position.
  • Fig. 10B when the lever 13 is pushed to the right, a locking part 14 will be pressed onto the cylinder rod and the spring 12 will keep the locking part in that locking position.
  • Fig. 11A and 11B show a similar case as in Fig. 10 ⁇ and 10B except that a lever 15 is turned clockwise or anticlockwise rather than the lever is pushed to right or left.
  • a small cam like the cam 9 in Fi ⁇ . 7 or a small circular piece 16 as shown here which is a disc being pivoted eccentrically is installed at the end of the locking part- When the cylinder rod retracts- the circular Diece 16 will tended to movo in an increasing radius so it help to jam the cylinder rod ⁇
  • Fi ⁇ 13A and 13B show the released condition and locked condition of a small piece when it is used as the lock ⁇ ing part.
  • Fig. 15A, 15B and 15C show a similar structure as that in Fig. 13A and 13B except the shape of the locking part changed slightly due to the shifting of the pivoting point 17.
  • Fig. 14A and 14B show the case when the cam head of the locking part is replaced by a flat piece 18.
  • Fig. 16A and 16B show the case when a cam piece is used as the locking part and it is kept in the released condition and locked condition by a spring 40.
  • Fig.l6A when the small ring 42 is pulled down, a cam piece 43 will be turned anticlockwisely by the string 46. After an equilibrium point is passed, the cam piece will be kept to press down onto the cylinder rod by the spring 40. When the ring 44 is pulled down, the cam piece will be turned clockwise, similarly after passing the equilibrium point, the cam piece will be kept by the spring in a released position.
  • Fig.l7A and 17B show a case similar to that in Fig.l6A and 16B except that the strings 46 and 47 are being repl- aced by a lever 48 on the cam piece. As the lever 48 is turned, the cam piece will be moved to the released position and locked position by the spring as stated above.
  • Fig. 18 to 28 show structures of the more simple retraction stoppers.
  • Fig. 18 and 19 show the isometric view and the elevation of a simple clamp which has cams on the locking ends and the other ends 19 & 20 will be pushed by the shoulder of the main body of the cylinder in a direction to increase the grasping force during retraction of the cylinder rod. This situation is as stated in claim 23.
  • Fig. 21 & 22 refer to the device in Fig. 20.
  • a screw 22 follows a threaded hole to press onto the side of a cylinder rod to stop it from retraction.
  • a screw passes through a loose hole on a jaw of a U-clip 23 first, then screwed into a threaded hole on the other jaw of the U-clip. So as the screw is turned, both jaws will be pulled together to stop the retraction of the cylinder rod.
  • Fig. 23 show a retraction stopper with hinge so that the device can be opened to allow easy clipping onto the cylinder rod.
  • a compression spring 25 always push the bolt up so that the nut, shown here as a rectangular piece, will be stopped to rotate by the shoulder 27 of the structure.
  • the bolt 28 is pressed down so that the body of the bolt can come out from the slot 29 and the upper part 30 can be swung up to enhance easy clipping.
  • some dents or marks 31 are being made to enhance more secure grasping.
  • Fig. 24 is a similar device as in Fig. 23 except that the hinge is being replaced by making a slot on one of the locking part to hold the second locking part.By turning the screw, a locking part will be pressed down by the screw onto the cylinder rod.
  • Fig. 25 show a simple clip with just a screw holding two jaws. As the screw is turned, the jaws will be clamped on or released from the cylinder rod which is being hold.
  • Fig. 26 show a similar structure as stated in Fig.23, except that a pivot 33 is used to provide circular movement of the locking part.
  • All the screw and bolts used here can be of any material and shape suitable for easy turning, so as shown in Fig. 27, a small rod 35 passing the screw head is prov ⁇ ided to turn the screw into a threaded hole 36 so as to press the locking part onto the cylinder rod.
  • Fig. 28 shows a structure as that in Fig. 23 except that the hinge is replaced by a slot on the locking part's structure and a wing head is provided here for more easily turning of the bolt .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)

Abstract

In a case when a cylinder is used for door's control, it is known that if the door is desired to be kept opened at a certain position, a reliable stopper against retraction of the cylinder rod is needed. In this invention, devices with secure locking mechanisms are added to the cylinders. The simple one just has a locking plate being pressed onto the cylinder rod by thightening a screw. The others involve self-jamming parts being pressed onto the central rods of the cylinders by a spring or other mechanical means. When the cylinder rod tends to retract, the friction between the rod and the self-jamming part tends to move the self-jamming part in a direction to cause even more jamming. This provided a mean towards secure stopping of the cylinder rod's retraction so that people will not have to worry about the closing of the storm door when they are moving large items, like furniture into or out from houses. Also people can keep the storm doors opened as they desire for the following people to come. However, when the storm doors are being pushed from inside the houses, the forces of the self-jamming parts against the cylinder rods will be much weaker so as to ensure that the doors can be pushed out for safety during emergency. Similarly, if this kind of retraction stopper is temporary or permanently attached to the central rod of a pneumatic cylinder holding the hood of an automobile, this will prevent the hood from dropping down unexpectedly due to the worn out hood lifting cylinder and thus prevent causing serious bodily injuries.

Description

Title : Stopper Against Cylinder Rod's Retraction . Description :
This invention relates to a device used for stopping the retraction of cylinder rods.
It is commonly found that cylinders' rods usually do not have a secure mean of retraction stopping. In the case of spring closer for storm door, usually just a small metal piece, sliding on the central rod is provide for stopping the retraction of the cylinder rod of the spring closer. However, quite often this metal piece is coated with dirty oil from the central rod of the cylinder so quite certain people will have to clean their hands after touching it. Also this metal piece is difficult to be placed properly especially by elderly people. Further¬ more, once the storm door has a slight movement, the metal piece may not be able to hold the door opened any¬ more. This give a embarrassing and even dangerous moment when people are moving large items into houses while the storm doors kept opened by the small metal pieces are easily closed again as a result of slight movement of the storm doors by a breeze or when the large items or the people moving through touch the storm doors.People may want to keep the storm doors opened for the following people, may be the elderly people, children or the disable per¬ sons to pass through. Also, the pneumatic cylinders holding hoods of auto¬ mobiles quite often are much weaker after a period of using and the hoods may drop down unexpectedly while they should be holding in places by the pneumatic cylinders. These create very dangerous moments and may cause serious bodily injuries.
Similarly, in other cases when cylinders are used, i will be much convenient and safer if some types of secure stoppers for retractions of cylinder rods are provided. I have found that the disadvantages as stated above may be overcome by adding a device permanently or temp¬ orary onto the cylinders. In the devices, there are stop¬ pers which press on the central rods to prevent them from retracting back into the cylinders. The stoppers can be si flat piece, sometimes bended into a small curve or a cam which has a fixed axis and increasing radius when it is turned by the retracting rod of the cylinder. For the contacting place of the stopper to the cylinder rod, it can be vee, saw-teeth, circular or corrugated shape when looked from the direction as the axis of the cylinder rod so that the stopper can grasp on the surface of the cylin¬ der rod much better. The stopper can be pressed onto the cylinder rod by some mechanical arrangements, some linkages or as in the simple form shown here, by turning a screw to press the stopper firmly onto the cylinder rod. The stopper can also be activated by a spring so as to pull it against the sur- face of the cylinder rod. Then as the rod retracts, the stopper plate or cam will be drawn towards the cylinder thus make it jammed even more onto the cylinder rod. When the stopper is moved to the release position as desired, it can be activated by a spring, may be the same spring for locking purposes to keep it in the release position. The locking and releasing can be done through some linkages, strings, levers or buttons according to different desires. Most of the stoppers for lockinςi show. here are single plate or single cam presses on the cylind- er rod, however, the stoppers can also be constructed so that two opposing plates or cams press onto the same position on the cylinder rods on both sides so as to enhance even more secure grasping on the cylinder rods.
In drawings which illustrate embodiments of the invent¬ ion, Fig. 1 and Fig. 2 Show the side views of the cylinder when the locking part is in the form of a plate or cam respectively .
Fig. 3Λ, 3D, 3C, 3D, 3E and 3F show the shape of the contacting end of the locking part onto the cylinder rod when viewed from direction A in Fig. 1 or direction B in Fig. 2. They are being flat-end, vee, saw-teeth, circular, multi-circular and corrugated respectively. Fig. 4, 5 and 6 are the sectioned end view, elevation and isometric view of the construction when using a plate as the locking part. Fig. 6 shows the retraction stopper being installed onto the cylinder. In Fig. 6 ,When the knob 1 is turned ; a locking part 2 which has one end being hold by clip 3 and the other end touches the cylind¬ er rod at a small inclined angle to the vertical will be pressed onto the cylinder rod 4 and stops the rod from retractinσ back into the cylinder. Item 5 & 6 are the bolt and nut sets for fastening the retraction stopper onto the cylinder.
Fig. 7, 8.& 9 are the end view- elevation and exploded view when two cams are used for stopping of the cylinder rod's retraction. In Fig. 7, when the lever of a cam 7 is pushed in the direction E until the cam touches the surface of the cylinder rod, it will be kept in that lock¬ ing position by an expansion spring 8 which tends to expand. Also another cam 9 will has been activated by the cam 7 through the spring 8 to move into its lo kinq position as in Fig. 7. Tf the rod retracts, the surface friction between it anri the cams will move the cams towards the cylinder- Since the cam have fixed axis and increasinα radius when turned in that direction, thev will be jammed even much more onto the cylinder rod hence the cylinder rod will be stopped for retraction. Similarly. when the lever of cam 7 is turned an i ci ockwisei y in Fig.7- cam 9 will be moved clockwisely by the spring 8. In this moment, the spring 8 is being compressed on both ends. After passing a certain point, the movement of the two cams will allow the spring to expand thus the spring 8 will expand to keep the two cams in a position to clear for touching the cylinder rod, that is the release position of the retraction stopper.
The following Fig. 10A, 10B, 11A, 11B, 12A, 12B, 13A, 13B, 14A, 14B,15A, 15B,15C, 16A, 16B, 17A and 17B are drawn in a simplified way so that the inside parts of the retraction stopper are much clearly shown for the under¬ stand of their movements.
Fig. 10A and 10B show linkages are used for the operation of the locking parts. In Fig.lOA, a tension spring 12 keep the locking part in a released position. In Fig. 10B, when the lever 13 is pushed to the right, a locking part 14 will be pressed onto the cylinder rod and the spring 12 will keep the locking part in that locking position.
Fig. 11A and 11B show a similar case as in Fig. 10Λ and 10B except that a lever 15 is turned clockwise or anticlockwise rather than the lever is pushed to right or left. In Fig. 12A and 12B. a small cam like the cam 9 in Fiα. 7 or a small circular piece 16 as shown here which is a disc being pivoted eccentrically is installed at the end of the locking part- When the cylinder rod retracts- the circular Diece 16 will tended to movo in an increasing radius so it help to jam the cylinder rod ■
Fiα 13A and 13B show the released condition and locked condition of a small piece when it is used as the lock¬ ing part. Fig. 15A, 15B and 15C show a similar structure as that in Fig. 13A and 13B except the shape of the locking part changed slightly due to the shifting of the pivoting point 17. Fig. 14A and 14B show the case when the cam head of the locking part is replaced by a flat piece 18.
Fig. 16A and 16B show the case when a cam piece is used as the locking part and it is kept in the released condition and locked condition by a spring 40. In Fig.l6A, when the small ring 42 is pulled down, a cam piece 43 will be turned anticlockwisely by the string 46. After an equilibrium point is passed, the cam piece will be kept to press down onto the cylinder rod by the spring 40. When the ring 44 is pulled down, the cam piece will be turned clockwise, similarly after passing the equilibrium point, the cam piece will be kept by the spring in a released position.
Fig.l7A and 17B show a case similar to that in Fig.l6A and 16B except that the strings 46 and 47 are being repl- aced by a lever 48 on the cam piece. As the lever 48 is turned, the cam piece will be moved to the released position and locked position by the spring as stated above.
Fig. 18 to 28 show structures of the more simple retraction stoppers. Fig. 18 and 19 show the isometric view and the elevation of a simple clamp which has cams on the locking ends and the other ends 19 & 20 will be pushed by the shoulder of the main body of the cylinder in a direction to increase the grasping force during retraction of the cylinder rod. This situation is as stated in claim 23.
Fig. 21 & 22 refer to the device in Fig. 20. In Fig.21 , a screw 22 follows a threaded hole to press onto the side of a cylinder rod to stop it from retraction. In Fig. 22, a screw passes through a loose hole on a jaw of a U-clip 23 first, then screwed into a threaded hole on the other jaw of the U-clip. So as the screw is turned, both jaws will be pulled together to stop the retraction of the cylinder rod.
Fig. 23 show a retraction stopper with hinge so that the device can be opened to allow easy clipping onto the cylinder rod. A compression spring 25 always push the bolt up so that the nut, shown here as a rectangular piece, will be stopped to rotate by the shoulder 27 of the structure. During clipping onto the cylinder rod, the bolt 28 is pressed down so that the body of the bolt can come out from the slot 29 and the upper part 30 can be swung up to enhance easy clipping. In the places where the locking part hold onto the cylinder rod, some dents or marks 31 are being made to enhance more secure grasping.
Fig. 24 is a similar device as in Fig. 23 except that the hinge is being replaced by making a slot on one of the locking part to hold the second locking part.By turning the screw, a locking part will be pressed down by the screw onto the cylinder rod.
Fig. 25 show a simple clip with just a screw holding two jaws. As the screw is turned, the jaws will be clamped on or released from the cylinder rod which is being hold. Fig. 26 show a similar structure as stated in Fig.23, except that a pivot 33 is used to provide circular movement of the locking part.
All the screw and bolts used here can be of any material and shape suitable for easy turning, so as shown in Fig. 27, a small rod 35 passing the screw head is prov¬ ided to turn the screw into a threaded hole 36 so as to press the locking part onto the cylinder rod. Fig. 28 shows a structure as that in Fig. 23 except that the hinge is replaced by a slot on the locking part's structure and a wing head is provided here for more easily turning of the bolt .

Claims

C l a i ms The embodiments of the invention in which an exclusiv property or privilege is claimed are defined as follows : Claim 1 : A device for stopping the central rods of the cylinders from retraction. Claim 2 : A device as defined in claim 1, in which it comprises of one or two locking parts which are pivoted on one end and hold by a spring or other mechanical means onto the central rod of the cylinder. Claim 3 : A device as defined in claim 1 or 2, in which the individual locking part has pivot point on each of them, but not necessarily on either end of them. One end of each of these locking parts touch onto the cylinder rod. Claim 4 : A device as defined in claim 1, 2 or 3, in which when the cylinder rod retracts, one or two parts for locking purpose will be activated by the surface friction between them and the cylinder rod. Claim 5 : A device as defined in claim 1, 2, 3 or 4, in which the locking parts touching the cylinder rod are constructed as cams which have fixed axis separately and increasing radius when they are drawn towards the cylind¬ er during the retraction of the cylinder rod. Claim 6 : A device as defined in claim 1, 2, 3, 4 or , in which the locking parts are pivoted in fixed positions while one end of the locking parts hold onto the cylinder rod. When the cylinder rod tends to retract, it tends to move the locking parts to a vertical position if considπr the cylinder rod as the horizon. This create a self- jamming effect. Claim 7 : A device as defined in claim 6 except that thi locking parts are hold in fixed positions rather than pivoted in fixed positions . Claim 8 : A device as defined in claim 6 or 7 , in which the locking parts are either flat-end, vee, saw-teeth, corrugated or circular shape when look in a direction as the axis of the cylinder from the cylinder rod side. The open side of the vee, saw-teeth, corrugated or circular shapes are facing the cylinder rod. Claim 9 : A device as defined in claim 6, 7 or 8 , in which when the locking part is moved to the other side away from locking, the spring that initially activates the locking parts onto the cylinder rod will now tends to keep the locking parts in a position away from the cylinder rod. Claim 10 : A device as defined in claim 6, 7, 8 or 9 , in which the locking parts are activated by a sliding piece through some linkages. When the sliding piece is moved to one side, the locking parts will be activated by the link¬ ages to press onto the cylinder rod so as to stop its movement. When the sliding piece is moved to the other side, the locking parts will be activated by the same linkages to release their pressing forces on the cylinder rod. Claim 11 : A device as defined in claim 10 except that the locking parts are activated to the lock position or the release position through some linkages by a lever rather than by a sliding piece. Claim 12 : A device as defined in claim 6, 7, 8 or 9 ,in which the locking part is activated by wires or strings attached onto the locking part. One wire or string is used for moving the locking part to a locking position while the other wire or string is used for moving the locking part to a release position. Claim 13 : A device as defined in claim 6, 7, 8, 9 or 12, in which the locking part has two wires, strings or linkages attached to it near its two ends. Claim 14 : A device as defined in claim 6, 7, 8, 9, 12 or 13, in which the locking part is pivoted onto a fixed position and the pivot on the locking part lies between the two wires, strings or linkages. Claim 15 : A device as defined in claim 6, 7, 8, 9, 10, 11, 12, 13 or 14, in which the locking part is pivoted onto or assembled together onto another part which touches the cylinder rod. Claim 16 : A device as defined in claim 15, in which the locking part is being hold down onto the cylinder rod by a spring linking the locking part with the other part mentioned in claim 15 . Claim 17 : A device as defined in claim 15, in which the two parts mentioned are being hold together onto the cylinder rod by turning a screw or bolt which runs through one or both of the two parts. Claim 18 : A device as defined in claim 6, 7, 8, 9, 10, 11, 12, 13 or 14, in which the jaws of a U-shaped clamp holding onto a cylinder rod are being activated together to grasp onto the cylinder rod by turning a screw or bolt running through one or both of the jaws. The cylinder rod is closer to the turning point of the U-shaped clamp than the screw or bolt. Claim 19 : A device as defined in claim 18 except that the grasping screw or bolt is closer to the turning point of the U-shaped clamp than the cylinder rod. Claim 20 : A device as defined in claim 6, 7, 8, 9, 10, 11 , 12, 13, 14 or 17, in which two locking parts both touching onto the same cylinder rod are being linked together by a part . Claim 21 : A device as defined in claim 20, in which the two locking parts are linked by a spring which in turn create a forces to activate the two locking parts onto the cylinder rod. Claim 22 : A device as defined in claim 10,17,20 or 21, in which one end of the two parts are pivoted together or linked together but allowing some free movement; this make it possible to situate one part against the cylinder rod first, then move the other part into the corresponding position against the cylinder rod. The screw or bolt is then being turned in order to hold the two parts together. Before this moment, the two parts are not linked together by the screw or bolt. This make the whole assembling to be possible for temporary installation easily when it is needed . Claim 23 : A device as defined in claim 15, 16, 17, 20 or 21, in which the ends of the locking parts touch the main body of the cylinder at an inclined angle during retraction of the cylinder rod,thus the other ends of the locking parts will be activated in the direction to increase their grasping forces onto the cylinder rod. Claim 24 : A device as defined in claim 15, 16, 17, 20 or 21, in which during retraction of the cylinder rod, both the locking part and the other part linking with the lock¬ ing part have their ends touch onto the main body of the cylinder at an inclined angle, thus they will be activated in a direction to increase their grasping forces onto the cylinder rod. Claim 25 : A device as defined in claim 1, 2, 4, 8, 15, 16, 17, 20 or 21, in which it comprises of two parts, each situated at the end of a diameter drawn through the cross section of the cylinder rod and facing each other. One end of each of the two parts are linked together by structures on the two parts to hold them together, pivot, hinge or other mean to confine the movements of that end of the two parts. The two locking parts grasp onto the cylinder rod with the cylinder rod between the pivoted point and a screw that links the two parts. Claim 26 : A device as defined in claim 25 except that the two locking parts are being pulled together by a bolt through a loose hole on one of the two locking part then runs through a slot on the other locking part. A nut on the end of the bolt is prevented to turn by a raised sh¬ oulder around the slot of the second locking part. The bolt is activated by a compression spring provided so that the nut will always be pulled to side of the raised sh¬ oulder hence the nut is prevented to be turned when the bolt is pulling the two locking parts onto the cylinder rod . Claim 27 : A device as defined in claim 1, 8, 17 or 22 , in which a locking part I is a plate with a little curve and a locking part U is bended into a U-shape. The part I lies in the u-channel of the part U. A screw runs through a threaded hole through one arm of the part U presses onto part I. The cylinder rod is being hold between part I and the second arm of part U. So as the screw is turned in, the part I and the second arm of part U grasp tightly onto the cylinder rod to prevent it from retracting back into the cylinder. Claim 28 : A device as defined in claim 25 or 26 , in which some dents or marks are being made onto the surface: of the locking parts touching on the cylinder rod so as to enhance more secure grasping of the parts onto the cylinder rod. Claim 29 : A device as defined in claim 25, 26 or 28, in which some rubber coating is being added onto the sur- face of the locking parts' jaws so as to enhance more se¬ cure grasping onto the cylinder rod . AMENDED CLAIMS [received by the International Bureau on 14 December 1995 (14.12.95) original claims 1-29 replaced by amended claims 1-24 (4 pages)] The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows : Claim 1 : An additional device temporary attached onto a cylinder and serve as a locking device to assist the original locking device in preventing the cylinder rod from retracting back into the cylinder when the original locking device of the cylinder rod is partially or wholly malfunctioning. Claim 2 : An additional device temporary attached onto a cylinder as defined in claim 1, in which a locking part in the shape of a flat piece with one end bent down to touch the cyl¬ inder rod is being forced directly onto the cylinder rod by turning a screw so as to serve as a locking device to assist the original locking device in preventing the cylinder rod from retracting back into the cylinder when the original lock¬ ing device of the cylinder rod is partially or wholly malfunc¬ tioning. Claim 3 : A device as defined in claim 1 or 2, in which the locking parts are either flat-end, vee, saw-teeth, corrugated or circular shape when look in a direction as the axis of the cylinder from the cylinder rod side. The open side of the vee, saw-teeth, corrugated or circular shapes are facing the cylin¬ der rod. Claim 4 : A device as defined in claim 1 or 3, in which when the locking part is moved to the other side away from locking, the spring that initially activates the locking parts onto the cylinder rod will now tends to keep the locking parts in a dir¬ ection away from the cylinder rod. Claim 5 : A device as defined in claim 1 or 3, in which the locking parts are activated by a sliding piece through some linkages. When the sliding piece is moved to one side, the locking parts will be activated by the linkages to press onto the cylinder rod so as to stop its movement. When the sliding piece is moved to the other side, the locking parts will be act- ivated by the same linkages to release their pressing forces on the cylinder rod. Claim 6 : A device as defined in claim 1, 3, 4 or 5, except that the locking parts are activated to the lock position or the release position through some linkages by a lever rather than by a sliding piece. Claim 7 : A device as defined in claim 1, 3 or 4, in which the locking part is activated by wires or strings attached onto the locking part. One wire or string is used for moving the locking part to a locking position while the other wire or string is used for moving the locking part to a release position. Claim 8 : A device as defined in claim 1, 3, 4 or 7 , in which the locking part has two wires, strings or linkages attached to it near its two ends. Claim 9 : A device as defined in claim 1, 3, 4, 7 or 8, in which the locking part is pivoted onto a fixed position and the pivot on the locking part lies between the two wires, strings or linkages. Claim 10 : A device as defined in claim 1, 3, 4, 5, 6, 7, 8 or 9, in which the locking part is pivoted onto or assembled together onto another part which touches the cylinder rod. Claim 11 : A device as defined in claim 1 or 10, in which the locking part is being hold down onto the cylinder rod by a spring linking the locking part with the other part mentioned in claim 10. Claim 12 : A device as defined in claim 1 or 10, in which the two parts mentioned are being hold together onto the cylinder rod by turning a screw or bolt which runs through one or both of the two parts . Claim 13 : A device as defined in claim 1, 3, 4, 5, 6, 7, 8 or 9 , in which the jaws of a U-shaped clamp holding onto a cylinder rod are being activated to grasp onto the cylinder rod by turning a screw or bolt running through one or both of the jaws. The cylinder rod is closer to the turning point of the U-shaped clamp than the screw or bolt. Claim 14 : A device as defined in claim 13 except that the grasping screw or bolt is closer to the turning point of the U-shaped clamp than the cylinder rod. Claim 15 : A device as defined in claim 1, 3, 4, 5, 6, 7, 8, 9 or 12, in which two locking parts both touching onto the same cylinder rod are being linked together by a part . Claim 16 : A device as defined in claim 1 or 15, in which the two locking parts are linked by a spring which in turn create a force to activate the two locking parts onto the cylinder rod. Claim 17 : A device as defined in claim 1, 11, 12, 15 or 16, in which one end of the two parts are pivoted together or linked together but allowing some free movement; this make it possible to situate one part against the cylinder rod first, then move the other part into the corresponding position against the cylinder rod. The screw or bolt is then being turned in order to hold the two parts together. Before this moment, the two parts are not linked together by the screw or bolt. This make the whole assembling to be possible for temporary installation easily when it is needed. Claim 18 : A device as defined in claim 1, 10, 11, 12, 15 or 16, in which the ends of the locking parts touch the main body of the cylinder at an inclined angle during retraction of the cylinder rod, thus the other ends of the locking parts will be activated in the direction to increase their grasping forces onto the cylinder rod. Claim 19 : A device as defined in claim 1, 10, 11, 12, 15 or 16, in which during retraction of the cylinder rod, both the locking part and the other part linking with the locking part have their ends touch onto the main body of the cylinder at an inclined angle, thus they will be activated in a direction to increase their grasping forces onto the cylinder rod. Claim 20 : A device as defined in claim 1, 3, 10, 11, 12, 15 or 16, in which it comprises of two parts, each situated at the end of a diameter drawn through the cross section of the cylinder rod and facing each other. One end of each of the two parts are linked together by structures on the two parts to hold them together, pivot, hinge or other mean to confine the movements of that end of the two parts. The two locking parts grasp onto the cylinder rod with the cylinder rod between the pivoted point and a screw that links the two parts. Claim 21 : A device as defined in claim 1 or 20, except that the two locking parts are being pulled together by a bolt through a loose hole on one of the two locking part then runs through a slot on the other locking part. A nut on the end of the bolt is prevented to turn by a raised shoulder around the slot of the second locking part. The bolt is activated by a compression spring provided so that the nut will always be pulled to side of the raised shoulder hence the nut is prevented to be turned when the bolt is pulling the two locking parts onto the cylinder rod. Claim 22 : A device as defined in claim 1, 3, 12 or 17, in which a locking part I is a plate with a little curve and a locking part U is bent into a U-shape. The part I lies in the u-channel of the part U. A screw runs through a threaded hole through one arm of the part U presses onto part I. The cylinder rod is being hold between part I and the second arm of part U. So as the screw is turned in, the part I and the second arm of part U grasp tightly onto the cylinder rod to prevent it from retracting back into the cylinder. Claim 23 : A device as defined in claim 1, 20 or 21, in which some dents or marks are being made onto the surfaces of the locking parts touching on the cylinder rod so as to enhance more secure grasping of the parts onto the cylinder rod. Claim 24 : A device as defined in claim 1, 20, 21 or 23, in which some rubber coating is being added onto the surface of the locking parts' jaws so as to enhance more secure grasping onto the cylinder rod. STATEMENT UNDER ARTICLE19 Amended claim 1 emphasizes that the claimed invention is specially designed for the following situations :
(1) It is an additional device temporary attached onto a cylinder; also
(2) It serves as a locking device to assist the original locking device in preventing the cylinder rod from retracting back into the cylinder when the original locking device of the cylinder rod is partially or wholly malfunctioning.
Amended claim 2 explains that the claimed invention is an additional device temporary attached onto a cylinder , in which a locking part in the shape of a flat piece with one end bent down to touch the cylinder rod is being forced directly onto the cylinder rod by turning a screw so as to serve as a locking device to assist the original locking device in preventing the cylinder rod from retracting back into the cylinder when the original locking device of the cylinder rod is partially or wholly malfunctioning. Amended claim 3 to 24 are original claim 8 to 29 which have slight amendments mainly due to changes of the Arabic num¬ erals in each claim since claim 8 to 29 now changed to amended claim 3 to 24.
Amended claim 13 is the original claim 18 in which the Arabic numerals have been amended and the word "together" in the 3rd line is deleted.
Amended claim 16 is the original claim 21 in which the Arabic numerals have been amended and the word "forces" in the 3rd line of this claim is amended to the word "force" .
According to the regulations, more descriptions and drawings for illustration of the contents in the amended claims could not be added in the present. However, there is not much im¬ pact on the descriptions and drawings since great endeavour had been made to clearly describe all the details in the amended claims submitted here-with.
PCT/CA1994/000568 1994-10-17 1994-10-17 Stopper against cylinder rod's retraction WO1996012077A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CA1994/000568 WO1996012077A1 (en) 1994-10-17 1994-10-17 Stopper against cylinder rod's retraction
AU78504/94A AU7850494A (en) 1994-10-17 1994-10-17 Stopper against cylinder rod's retraction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA1994/000568 WO1996012077A1 (en) 1994-10-17 1994-10-17 Stopper against cylinder rod's retraction

Publications (1)

Publication Number Publication Date
WO1996012077A1 true WO1996012077A1 (en) 1996-04-25

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ID=4173031

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA1994/000568 WO1996012077A1 (en) 1994-10-17 1994-10-17 Stopper against cylinder rod's retraction

Country Status (2)

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AU (1) AU7850494A (en)
WO (1) WO1996012077A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2781004A1 (en) * 1998-07-08 2000-01-14 Cabines Denizet Sa Retention device for holding sliding vehicle doors in an open or closed position
US6658695B1 (en) * 2002-08-09 2003-12-09 Paul S. Genua Door securing device
US6981295B2 (en) * 2003-02-27 2006-01-03 Duffy Tom W Door closer hold-open apparatus
US20120167340A1 (en) * 2011-01-04 2012-07-05 Cmech (Guangzhou) Industrial Ltd. Door closer capable of realizing self-control positioning
KR102145682B1 (en) * 2019-02-18 2020-08-18 삼익에프에이 주식회사 Stopper device for display folding machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH87135A (en) * 1919-12-08 1920-11-01 Schmid Adolf Window holder adjustable for different opening positions of the window.
US1386291A (en) * 1920-09-10 1921-08-02 James Y Van Blarcom Shutter-fastener
GB311607A (en) * 1928-08-02 1929-05-16 Charles Harold Bach Improvements relating to adjustable stays or fastenings for the windscreens of motorroad vehicles and like hinged or pivoted panels
GB641136A (en) * 1948-06-26 1950-08-02 Eric Stanley Perry Improvements relating to windscreens for vehicles
FR1580509A (en) * 1967-07-21 1969-09-05

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH87135A (en) * 1919-12-08 1920-11-01 Schmid Adolf Window holder adjustable for different opening positions of the window.
US1386291A (en) * 1920-09-10 1921-08-02 James Y Van Blarcom Shutter-fastener
GB311607A (en) * 1928-08-02 1929-05-16 Charles Harold Bach Improvements relating to adjustable stays or fastenings for the windscreens of motorroad vehicles and like hinged or pivoted panels
GB641136A (en) * 1948-06-26 1950-08-02 Eric Stanley Perry Improvements relating to windscreens for vehicles
FR1580509A (en) * 1967-07-21 1969-09-05

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2781004A1 (en) * 1998-07-08 2000-01-14 Cabines Denizet Sa Retention device for holding sliding vehicle doors in an open or closed position
US6658695B1 (en) * 2002-08-09 2003-12-09 Paul S. Genua Door securing device
US6981295B2 (en) * 2003-02-27 2006-01-03 Duffy Tom W Door closer hold-open apparatus
US20120167340A1 (en) * 2011-01-04 2012-07-05 Cmech (Guangzhou) Industrial Ltd. Door closer capable of realizing self-control positioning
US8443488B2 (en) * 2011-01-04 2013-05-21 Cmech (Guangzhou) Industrial Ltd. Door closer capable of realizing self-control positioning
KR102145682B1 (en) * 2019-02-18 2020-08-18 삼익에프에이 주식회사 Stopper device for display folding machine

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