GB2122790A - Lever mechanism - Google Patents
Lever mechanism Download PDFInfo
- Publication number
- GB2122790A GB2122790A GB08214352A GB8214352A GB2122790A GB 2122790 A GB2122790 A GB 2122790A GB 08214352 A GB08214352 A GB 08214352A GB 8214352 A GB8214352 A GB 8214352A GB 2122790 A GB2122790 A GB 2122790A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lever
- box
- plunger
- switch
- situated
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
- B61L5/02—Mechanical devices for operating points or scotch-blocks, e.g. local manual control
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanical Control Devices (AREA)
Abstract
A manually-operable lever box for operating the points of a railway switch mechanism has its operating lever (19) mounted on a pivot (18) situated within the lever box (10). This enables the lever to lie flush with or below the level of the track, so that it cannot be struck by a passing train. <IMAGE>
Description
SPECIFICATION
Lever mechanism
This invention relates to lever mechanisms for operating the points of a railway switch mechanism. It is especially concerned with the provision of a lever box of the manually operable type.
Hand-controlled lever boxes are well known, and have been in operation for a very large number of years. Basically the mechanism comprises a spring toggle system in operative connection with the switch and tending to hold the switch in either of two positions, and a hand lever normally occupying a common rest position (whether the toggle mechanism is set in one position or the other) and adapted when operated to change the position of the toggle mechanism from one extreme to the other and consequently to reverse the switch or points through the connection thereto of the toggle mechanism. A basic known type of lever box is illustrated in
Figure 1 of the accompanying drawings.
In all hand-operated lever boxes the operating lever is pivotally mounted on the top of the box.
Thus, in Figure 1, the lever 1 is mounted on a pin 2 held between brackets 3 welded to the top plate 4 of the box. Movement of the lever 1 about the pivot pin 2 causes a plunger 5 to operate a bell crank mechanism 6 to reverse the points.
The fact that the operating lever 1 is situated on top of the lever box means that in operation it is mounted above the level of the railway track.
This has disadvantages, in that the lever can be struck by a passing train, or attachment thereto, with possibly serious consequences. It is an object of the present invention to provide a lever box which does not suffer from this disadvantage.
According to the invention there is provided a lever box in which the manually-operable lever is mounted on a pivot situated within the box. This enables the lever to lie flush with or below the level of the track. It cannot, therefore, be struck by a passing train.
An embodiment of the invention will be described with reference to Figures 2 to 5 of the accompanying drawings, in which
Figure 2 is a side elevation of a lever box;
Figure 3 is a schematic plan view of the box of
Figure 2;
Figure 4 is an end elevation of the box of Figure 2 attached to a switch blade; and
Figure 5 is an elevation, on a larger scale, of the operational end of the lever.
Referring to Figures 2 to 5 of the drawings, a lever box 10 comprises a body 11 and a top plate 1 2. The body 11 contains the usual spring toggle and bell crank mechanisms 13, 14 respectively.
Rotation of the bell crank mechanism 14, and hence reversal of the disposition of the toggle mechanism 13, with consequent switching of the points through a connecting rod 15, is achieved by a horizontally-movable plunger 16. This operation is identical to that of known lever boxes.
Mounted between two retaining brackets 1 7 situated within the body 11 is a pivot pin 18, and fulcrumed on pivot pin 18 is an operating lever 19. The lever 19 lies flush with the top plate 12 of the lever box 10. The operational end of the lever 19, i.e. that portion situated within the body 11, is illustrated in Figure 5. It consists of a hooked end portion 20 having two reaction faces 21 and 22 respectively. The hooked end portion 20 'of the lever 1 9 is retained within a cut-out 23 formed in an enlarged end portion 24 of plunger 1 6. Cut-out 23 has-a reaction surface 25 which is engaged, in the position of the mechanism shown in the drawings, by reaction face 21.
In order to operate the lever box of the invention the lever 19 is manually grasped and is pivoted about the pivot pin 1 8. The cam surface formed by reaction faces 21 and 22 of the lever 19 acts on face 25 of the plunger 1 6 to cause the plunger to move horizontally, left-to-right as viewed in Figures 2 and 3. Plunger 1 6 contacts and swivels the bell crank mechanism 14, with consequent movement of the spring toggle mechanism 13, the connecting rod 1 5 and a switch rail 26 to which connecting rod 1 5 is fixed.
After switching the points, the lever 1 9 is returned to its initial horizontal position, flush with the top plate 12 and, as can be seen from Figure 4, below the level of adjacent rail 27.
Claims
1. A lever box in which a manually operable lever is mounted in a pivot situated within the box.
2. A lever box as claimed in claim 1, substantially as described with reference to the drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. A lever box in which a manually operable lever is mounted in a pivot situated within the box.
2. A lever box as claimed in claim 1, substantially as described with reference to the drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08214352A GB2122790A (en) | 1982-05-17 | 1982-05-17 | Lever mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08214352A GB2122790A (en) | 1982-05-17 | 1982-05-17 | Lever mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
GB2122790A true GB2122790A (en) | 1984-01-18 |
Family
ID=10530413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08214352A Withdrawn GB2122790A (en) | 1982-05-17 | 1982-05-17 | Lever mechanism |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2122790A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5052642A (en) * | 1990-04-18 | 1991-10-01 | Peters Terry D | Switch stand |
US5375796A (en) * | 1993-12-28 | 1994-12-27 | Western States Supply | Railway switch stand having slide block actuator and two independent operating mechanisms |
DE29510718U1 (en) * | 1995-07-01 | 1995-11-23 | Wbg Weichenwerk Brandenburg Gmbh, 14774 Brandenburg | Setting device for a switch |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB222235A (en) * | 1923-07-06 | 1924-10-02 | Owen Richard Williams | Improved hand point lever for railways and the like |
GB265107A (en) * | 1926-10-28 | 1927-02-03 | John James Ferguson | Improvements in ground levers for railway points and switches |
GB293583A (en) * | 1927-08-09 | 1928-07-12 | Llewelyn Wynn Williams | Improvements in or relating to railway point levers |
GB585128A (en) * | 1945-02-07 | 1947-01-30 | Albert Wynn Williams | Improvements in and relating to railway switch or point operating mechanism |
GB947855A (en) * | 1959-03-16 | 1964-01-29 | Denis Heron | A new or improved mechanism for operating points and switches in railway and like tracks |
-
1982
- 1982-05-17 GB GB08214352A patent/GB2122790A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB222235A (en) * | 1923-07-06 | 1924-10-02 | Owen Richard Williams | Improved hand point lever for railways and the like |
GB265107A (en) * | 1926-10-28 | 1927-02-03 | John James Ferguson | Improvements in ground levers for railway points and switches |
GB293583A (en) * | 1927-08-09 | 1928-07-12 | Llewelyn Wynn Williams | Improvements in or relating to railway point levers |
GB585128A (en) * | 1945-02-07 | 1947-01-30 | Albert Wynn Williams | Improvements in and relating to railway switch or point operating mechanism |
GB947855A (en) * | 1959-03-16 | 1964-01-29 | Denis Heron | A new or improved mechanism for operating points and switches in railway and like tracks |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5052642A (en) * | 1990-04-18 | 1991-10-01 | Peters Terry D | Switch stand |
US5375796A (en) * | 1993-12-28 | 1994-12-27 | Western States Supply | Railway switch stand having slide block actuator and two independent operating mechanisms |
DE29510718U1 (en) * | 1995-07-01 | 1995-11-23 | Wbg Weichenwerk Brandenburg Gmbh, 14774 Brandenburg | Setting device for a switch |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |