CA1259358A - Friction stay arm assembly for a window - Google Patents
Friction stay arm assembly for a windowInfo
- Publication number
- CA1259358A CA1259358A CA000486910A CA486910A CA1259358A CA 1259358 A CA1259358 A CA 1259358A CA 000486910 A CA000486910 A CA 000486910A CA 486910 A CA486910 A CA 486910A CA 1259358 A CA1259358 A CA 1259358A
- Authority
- CA
- Canada
- Prior art keywords
- track
- friction
- handle
- sliding
- window
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
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
- E05C17/12—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 consisting of a single rod
- E05C17/24—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 consisting of a single rod pivoted at one end, and with the other end running along a guide member
- E05C17/28—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 consisting of a single rod pivoted at one end, and with the other end running along a guide member with braking, clamping or securing means at the connection to the guide member
Abstract
ABSTRACT OF THE DISCLOSURE
A friction stay arm for a hinged window sash in a window frame has a sliding member with a friction surface to lock the window sash in any open position. By utilizing a sliding member with a friction surface to lock against a metal track, the force required to lock the window is reduced and the holding power preventing the window swinging in a wind is increased. The stay arm assembly includes a locking handle in the window sash having a sliding position and a locked position, extension arm mechanism connected from the handle, channel shaped track in one side of the window sash having a fixed ramp member therein, a movable ramp member positioned in the track and connected to the extension arm mechanism such that when the handle is turned from the sliding position to the locked position, the movable ramp member moves adjacent the fixed ramp member in the track. A sliding member in the track is free to slide when the handle is in the sliding position, and locked by the movable ramp member when the handle is in the locked position, an arm member has one end pivotally attached to the sliding member and the other end pivotally attached to a fixed position on the window frame. The improvement comprises inward facing shoulders at extremities of flanges on the channel shaped track, the sliding member having a friction surface to engage with the inward facing shoulders of the track when the handle is in the locked position, the friction surface being forced against the inward facing shoulders of the track by the movable ramp member and the fixed ramp member.
A friction stay arm for a hinged window sash in a window frame has a sliding member with a friction surface to lock the window sash in any open position. By utilizing a sliding member with a friction surface to lock against a metal track, the force required to lock the window is reduced and the holding power preventing the window swinging in a wind is increased. The stay arm assembly includes a locking handle in the window sash having a sliding position and a locked position, extension arm mechanism connected from the handle, channel shaped track in one side of the window sash having a fixed ramp member therein, a movable ramp member positioned in the track and connected to the extension arm mechanism such that when the handle is turned from the sliding position to the locked position, the movable ramp member moves adjacent the fixed ramp member in the track. A sliding member in the track is free to slide when the handle is in the sliding position, and locked by the movable ramp member when the handle is in the locked position, an arm member has one end pivotally attached to the sliding member and the other end pivotally attached to a fixed position on the window frame. The improvement comprises inward facing shoulders at extremities of flanges on the channel shaped track, the sliding member having a friction surface to engage with the inward facing shoulders of the track when the handle is in the locked position, the friction surface being forced against the inward facing shoulders of the track by the movable ramp member and the fixed ramp member.
Description
FRICTION STAY ~RM ASSEMBLY FOR A WINDOW
.
The present invention relates to a friction stay arm for a hinged window sash in a window frame. More specifically the present invention provides a novel friction locking member for a friction stay arm assembly suitable for a window which allows a hinged window sash to be locked in any open window position.
Hinged window assemblies require some type of stay arm system so that a window sash may be swung open and locked in at least one open window position, otherwise wind can force ~he window sash to swing. There are many types of stay arm systems, some of the older designs have a series of specific positions with holes in a swing arm which fit over a pin fixed to the window frame. Another system provides a rotating handle and mechanism on the frame which moves a lever connected to the window sash. Perhaps the most desirable type of window opening system is one which is simple and requires a person to push a window sash to any desired open window position and then lock the window sash in that position knowing that it will not move when it is left.
Friction stay arms are provided which partially meet this demand. They have a friction member which runs in a trac~ mounted on the window sash with a pivot link between the friction member and the frame. However, such a system requires a falrly heavy push or pull in order to overcome the friction and open or close the window. This system may be acceptable for an inward opening window, however, for an outward opening window, the friction force to overcome wind and hold the window in an open position has to be so great that it becomes difficult to open and close the window.
Another type of friction stay arm mechanism for a hinged window includes one which has a loc~ing handle in the window sash that can be turned from a locked position to a ..~
.
The present invention relates to a friction stay arm for a hinged window sash in a window frame. More specifically the present invention provides a novel friction locking member for a friction stay arm assembly suitable for a window which allows a hinged window sash to be locked in any open window position.
Hinged window assemblies require some type of stay arm system so that a window sash may be swung open and locked in at least one open window position, otherwise wind can force ~he window sash to swing. There are many types of stay arm systems, some of the older designs have a series of specific positions with holes in a swing arm which fit over a pin fixed to the window frame. Another system provides a rotating handle and mechanism on the frame which moves a lever connected to the window sash. Perhaps the most desirable type of window opening system is one which is simple and requires a person to push a window sash to any desired open window position and then lock the window sash in that position knowing that it will not move when it is left.
Friction stay arms are provided which partially meet this demand. They have a friction member which runs in a trac~ mounted on the window sash with a pivot link between the friction member and the frame. However, such a system requires a falrly heavy push or pull in order to overcome the friction and open or close the window. This system may be acceptable for an inward opening window, however, for an outward opening window, the friction force to overcome wind and hold the window in an open position has to be so great that it becomes difficult to open and close the window.
Another type of friction stay arm mechanism for a hinged window includes one which has a loc~ing handle in the window sash that can be turned from a locked position to a ..~
- 2 ~ 9~58 sliding position. In the sliding position, the window sash can be pushed open and clos~d and moves relatively easily about its hinge, then by turning the handle to the locked position, 'the window sash is locked and is not supposed to swing.' Most existing designs of this type, however, rely on metal to metal sliding friction to stop the swinging and this is generally not sufficient to prevent the window sash swinging in a high wind. Furthermore, if one does use metal to metal friction locking,'then the ~orce required to rotate the locking handle becomes excessive, preventing children or older people from uslng the window.
The present invention overcomes the problems of a friction stay arm mechanism which does not lock properly when the locking handle is in a locked position, by providing a sliding member which slides in a track fixed to the window sash, 'the sliding member having a friction surface which when pushed into engagement with flanges or rails on the track, 'locks the sliding member to the track in a positive manner without undue pressure being applied, such that strong 2~ winds cannot move the position af the window sash.
~he present invention provides in a friction stay arm assembly for a hinged window sash in a window frame, including a locking handle in the window sash having a sliding position and a locked position, extension arm mech-amism means connected from the handle, channel shaped track in one side of the window sash having a fixed ramp member therein, a movable ramp member positioned in the track, and connected to the extension arm mechanism means such that when the handle is turned from the sliding position to the locked position,'the movable ramp member-moves adjacent the fixed ramp member in the track, 'sliding member in the track, free to slide when the handle is in the sliding position, and locked by the movable ramp member and the fixed ramp member when the handle is in the locked position, arm member ~ ~ 3 - ~59358 having one end pivotally attached to the sliding member and the other~end pivotally attached to a fixed position on the window frame, the improvement comprising inward facing shoulders at extremities of flanges on the channel shaped track, the sliding member having a friction surface to engage with the inward facing shoulders of the track when the handle is in the locked position, the friction surface being forced against the inward facing shoulders of the track by the movable ramp member and the fixed ramp member.
In other embodiments of the invention, the sliding member has a T-shaped cross section with a side flange of the T-shape touching the inward facing shoulders of the track.
Friction material may be provided for the friction surface with metal protective pieces at each end of the sliding member and the friction material preferably stands higher than the metal protective pieces permitting only the friction material to engage with the inward facing shoulders of the track.
Preferably the friction material is glued to a metal back-u~ strip of the sliding member which is formed integrally with the metal protective pieces. The friction material is preferably a carbon composition having metal flakes embedded therein.
In drawings which illustrate embodiments of the invention, Figure 1 is a front elevational view showing a double sash hinged window assembly, Figure 2 is an exploded view showing a friction stay arm assembly for a hinged sash window assembly, Figure 3 is a partial sectional front view showing the top of a window sash with the channel shaped track and stay arm, Figure 4 is a side sectional view through the channel shaped track of a friction stay ar~ assembly, Figure 5 is a top view showing the friction stay arm assembly of Figure 4, 4- 1~5~58 Fi.gure 6 is.a top view of a sliding member which slides in the channel shaped track of the friction stay arm assembly, Figure 7 is a side view of the sliding member shown in Figure 6, Figure 8 is a sectional view taken at line 8-8 of Figure 7.
Figure l-shows a side hung casement window with two hinged sashes 10.opening in a window frame ll. A friction stay arm assembly 15 is shown in Figure 2. One such assembly 15 is fitted in each window sash 10. A locking handle 16 is positioned on the opening side of each sash 10 at a convenient height, and is connected by means of a pinion and ratchet connection 11 to a first extension arm 18 which extends both upwards and downwards in the window sash 10. Although not specifically forming part of this invention, the first extension arm 18 generally has a bolt 20 at its bottom end for insertion into the frame ll of the window to provide a positive lock when the sash is closed. In another embodiment, locking pieces 21 on the side of one sash engage in locking sockets (not shown) on the adjacent sash to positively lock both sashes together when they are both closed. The first extension arm 18 is connected at its top to an angle portion 22 with a flexible member 23 to carry the movement of the extension arm 18.around to the top of the sash and connects to a second 25- extension arm 24. As can be seen in Figure 3, the second extension arm 23 joins to a movable ramp member 25 comprising a number of sloping ramps which is illustrated more clearly in Figure 4. The movable ramp member 25 reciprocates back-wardsand forwards in a channel shaped track 26 which includes a stationary ramp member 27 in the base of the track 26. The stationary ramp member has a number of sloping ramps approx-imately the same length and slope as the movable ramp member 25 so that when the movable ramp member 25 is moved to the right (when looking at Figure 4) the member 25 is forced _ 5 _ ~L2S9358 upwards away from the fixed ramp member 27 and when moved to the left, it moves downwards following the slope of the ramps. On top of the movable ramp member 25 is a sliding member 28 which has a pivot 29 at its center and is attached to an arm 30 as shown in Figure 5. At the end of the arm 30 is a -second pivot 3I connecting the arm 30 to an attachment 32 which is flxed in a fixed position to the window frame 11.
In operation of the friction stay arm assembly, the locking handle 16 is turned from a locked position which is when the movable ramp mernber 25 is to the right and thus is raised as far as possible above the fixed ramp member 27.
~his causes the movable ramp mem3~er 25 ~o push the sliding member 28 up against inward facing shoulders 33 at the top of the channel shaped track 26 and locks the sliding member 28 so it cannot slide in the track 26. When the handle 16 is moved to the sliding position, the movable ramp member 25 moves to the left so that it is in a lower elevation, and does not push against the sliding rnernber 28 leaving it free to slide in the channel shaped track 26.
The sliding member 28 is better illustrated in Figures 6, 7 and 8 and comprises a metal backing strip 40 having a T-shaped cross section as shown in Figure 8. Metal protective pieces 41 are provided on each end of the backing strip 40 and are formed integral therewith. A central metal .
portion 42 has a stud 43 for the pivot connection 29 to arm 30. A steel spring membex 45 bows down underneath the sliding member 28 providing some resilience and preventing the sliding member 28 from rattling in the track 26. Friction material pieces 47 are placed between the protective peices 41 and the central portion 42 of the sliding member 28. They are substantially T-shaped, and arranged so that the flange 48 of the T-shaped friction member is raised above the flanges of the protective pieces 41 and the central portion 42 of the sliding member 28, thus ensuring that when the sliding member - 6 - ~2 5 935 8 28 is pushed up to make contact with the inward facing shoulders 3~ o the track 26, then it is the friction surface 48 which touches the track and not the metal surface. It is found that the friction surface requires considerable less pressure to form a positive lock and prevent the window sash from moving. This means ~hat the force required to rotate the handle rom the sliding position to the locked position, is much less than required in a unit which does nat have a friction surface to st~p the sliding member from movingO
In a preerred embodiment, the friction surface i~ a carbon material having metal flakes therein similar to that used in brake pa~s and the like, sold under the trade mark FERODO brake lining material. It is found that by sub-stituting the friction surface in place of a metal surface, and using the same force to turn the handle 16 on the sash, the locking force for the opening sash in increased by at least 300%. The movable ramp member 25 and fixed ramp member 27 are preferably~formed of brass, although other suitable metal alloys ma~ be used provided they do not distort or seize together.
Various changes may be made to the friction stay arm assembly as illustrated herein without departing from the scope of the present invention which is limited only by the follawing claims.
The present invention overcomes the problems of a friction stay arm mechanism which does not lock properly when the locking handle is in a locked position, by providing a sliding member which slides in a track fixed to the window sash, 'the sliding member having a friction surface which when pushed into engagement with flanges or rails on the track, 'locks the sliding member to the track in a positive manner without undue pressure being applied, such that strong 2~ winds cannot move the position af the window sash.
~he present invention provides in a friction stay arm assembly for a hinged window sash in a window frame, including a locking handle in the window sash having a sliding position and a locked position, extension arm mech-amism means connected from the handle, channel shaped track in one side of the window sash having a fixed ramp member therein, a movable ramp member positioned in the track, and connected to the extension arm mechanism means such that when the handle is turned from the sliding position to the locked position,'the movable ramp member-moves adjacent the fixed ramp member in the track, 'sliding member in the track, free to slide when the handle is in the sliding position, and locked by the movable ramp member and the fixed ramp member when the handle is in the locked position, arm member ~ ~ 3 - ~59358 having one end pivotally attached to the sliding member and the other~end pivotally attached to a fixed position on the window frame, the improvement comprising inward facing shoulders at extremities of flanges on the channel shaped track, the sliding member having a friction surface to engage with the inward facing shoulders of the track when the handle is in the locked position, the friction surface being forced against the inward facing shoulders of the track by the movable ramp member and the fixed ramp member.
In other embodiments of the invention, the sliding member has a T-shaped cross section with a side flange of the T-shape touching the inward facing shoulders of the track.
Friction material may be provided for the friction surface with metal protective pieces at each end of the sliding member and the friction material preferably stands higher than the metal protective pieces permitting only the friction material to engage with the inward facing shoulders of the track.
Preferably the friction material is glued to a metal back-u~ strip of the sliding member which is formed integrally with the metal protective pieces. The friction material is preferably a carbon composition having metal flakes embedded therein.
In drawings which illustrate embodiments of the invention, Figure 1 is a front elevational view showing a double sash hinged window assembly, Figure 2 is an exploded view showing a friction stay arm assembly for a hinged sash window assembly, Figure 3 is a partial sectional front view showing the top of a window sash with the channel shaped track and stay arm, Figure 4 is a side sectional view through the channel shaped track of a friction stay ar~ assembly, Figure 5 is a top view showing the friction stay arm assembly of Figure 4, 4- 1~5~58 Fi.gure 6 is.a top view of a sliding member which slides in the channel shaped track of the friction stay arm assembly, Figure 7 is a side view of the sliding member shown in Figure 6, Figure 8 is a sectional view taken at line 8-8 of Figure 7.
Figure l-shows a side hung casement window with two hinged sashes 10.opening in a window frame ll. A friction stay arm assembly 15 is shown in Figure 2. One such assembly 15 is fitted in each window sash 10. A locking handle 16 is positioned on the opening side of each sash 10 at a convenient height, and is connected by means of a pinion and ratchet connection 11 to a first extension arm 18 which extends both upwards and downwards in the window sash 10. Although not specifically forming part of this invention, the first extension arm 18 generally has a bolt 20 at its bottom end for insertion into the frame ll of the window to provide a positive lock when the sash is closed. In another embodiment, locking pieces 21 on the side of one sash engage in locking sockets (not shown) on the adjacent sash to positively lock both sashes together when they are both closed. The first extension arm 18 is connected at its top to an angle portion 22 with a flexible member 23 to carry the movement of the extension arm 18.around to the top of the sash and connects to a second 25- extension arm 24. As can be seen in Figure 3, the second extension arm 23 joins to a movable ramp member 25 comprising a number of sloping ramps which is illustrated more clearly in Figure 4. The movable ramp member 25 reciprocates back-wardsand forwards in a channel shaped track 26 which includes a stationary ramp member 27 in the base of the track 26. The stationary ramp member has a number of sloping ramps approx-imately the same length and slope as the movable ramp member 25 so that when the movable ramp member 25 is moved to the right (when looking at Figure 4) the member 25 is forced _ 5 _ ~L2S9358 upwards away from the fixed ramp member 27 and when moved to the left, it moves downwards following the slope of the ramps. On top of the movable ramp member 25 is a sliding member 28 which has a pivot 29 at its center and is attached to an arm 30 as shown in Figure 5. At the end of the arm 30 is a -second pivot 3I connecting the arm 30 to an attachment 32 which is flxed in a fixed position to the window frame 11.
In operation of the friction stay arm assembly, the locking handle 16 is turned from a locked position which is when the movable ramp mernber 25 is to the right and thus is raised as far as possible above the fixed ramp member 27.
~his causes the movable ramp mem3~er 25 ~o push the sliding member 28 up against inward facing shoulders 33 at the top of the channel shaped track 26 and locks the sliding member 28 so it cannot slide in the track 26. When the handle 16 is moved to the sliding position, the movable ramp member 25 moves to the left so that it is in a lower elevation, and does not push against the sliding rnernber 28 leaving it free to slide in the channel shaped track 26.
The sliding member 28 is better illustrated in Figures 6, 7 and 8 and comprises a metal backing strip 40 having a T-shaped cross section as shown in Figure 8. Metal protective pieces 41 are provided on each end of the backing strip 40 and are formed integral therewith. A central metal .
portion 42 has a stud 43 for the pivot connection 29 to arm 30. A steel spring membex 45 bows down underneath the sliding member 28 providing some resilience and preventing the sliding member 28 from rattling in the track 26. Friction material pieces 47 are placed between the protective peices 41 and the central portion 42 of the sliding member 28. They are substantially T-shaped, and arranged so that the flange 48 of the T-shaped friction member is raised above the flanges of the protective pieces 41 and the central portion 42 of the sliding member 28, thus ensuring that when the sliding member - 6 - ~2 5 935 8 28 is pushed up to make contact with the inward facing shoulders 3~ o the track 26, then it is the friction surface 48 which touches the track and not the metal surface. It is found that the friction surface requires considerable less pressure to form a positive lock and prevent the window sash from moving. This means ~hat the force required to rotate the handle rom the sliding position to the locked position, is much less than required in a unit which does nat have a friction surface to st~p the sliding member from movingO
In a preerred embodiment, the friction surface i~ a carbon material having metal flakes therein similar to that used in brake pa~s and the like, sold under the trade mark FERODO brake lining material. It is found that by sub-stituting the friction surface in place of a metal surface, and using the same force to turn the handle 16 on the sash, the locking force for the opening sash in increased by at least 300%. The movable ramp member 25 and fixed ramp member 27 are preferably~formed of brass, although other suitable metal alloys ma~ be used provided they do not distort or seize together.
Various changes may be made to the friction stay arm assembly as illustrated herein without departing from the scope of the present invention which is limited only by the follawing claims.
Claims (6)
1. In a friction stay arm assembly for a hinged window sash in a window frame, including, a locking handle in the window sash having a sliding position and a locked position, extension arm mechanism means connected from the handle, channel shaped track in one side of the window sash having a fixed ramp member therein, a movable ramp member positioned in the track, and connected to the extension arm mechanism means such that when the handle is turned from the sliding position to the locked position, the movable ramp member moves adjacent the fixed ramp member in the track, sliding member in the track, free to slide when the handle is in the sliding position, and locked by the movable ramp member and the fixed ramp member when the handle is in the locked position, arm member having one end pivotally attached to the sliding member and the other end pivotally attached to a fixed position on the window frame, the improvement comprising, inward facing shoulders at extremities of flanges on the channel shaped track, the sliding member having a friction surface to engage with the inward facing shoulders of the track when the handle is in the locked position, the friction surface being forced against the inward facing shoulders of the track by the movable ramp member and the fixed ramp member.
2. The friction stay arm assembly according to claim 1 wherein the sliding member has a T-shaped cross section with the inside flanges of the T-shape touching the inward facing shoulders of the track.
3. The friction stay arm assembly according to claim 1 wherein friction material is provided for the friction surface with metal protective pieces at each end of the sliding member.
4. The friction stay arm assembly according to claim 3 wherein the friction material stands higher than the metal protective pieces permitting only the friction material to engage with the inward facing shoulders of the track.
5. The friction stay arm assembly according to claim 3 wherein the friction material is glued to a metal back-up strip of the sliding member which is formed integrally with the metal protective pieces.
6. The friction stay arm assembly according to claim 3 wherein the friction material is a carbon composition with metal flakes embedded therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000486910A CA1259358A (en) | 1985-07-17 | 1985-07-17 | Friction stay arm assembly for a window |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000486910A CA1259358A (en) | 1985-07-17 | 1985-07-17 | Friction stay arm assembly for a window |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1259358A true CA1259358A (en) | 1989-09-12 |
Family
ID=4130992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000486910A Expired CA1259358A (en) | 1985-07-17 | 1985-07-17 | Friction stay arm assembly for a window |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1259358A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2733786A1 (en) * | 1995-05-05 | 1996-11-08 | Weidtmann Wilhelm Kg | LOCKING DEVICE FOR WINDOWS, DOORS OR THE LIKE |
-
1985
- 1985-07-17 CA CA000486910A patent/CA1259358A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2733786A1 (en) * | 1995-05-05 | 1996-11-08 | Weidtmann Wilhelm Kg | LOCKING DEVICE FOR WINDOWS, DOORS OR THE LIKE |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |