JPH0253461U - - Google Patents

Description

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing the operating state of the construction key device of a cons tumbler lock according to an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along the line of Fig. 1, and Fig. 3 is a cross-sectional view of the construction key device shown in Fig. 1. - A cross-sectional view of the inner cylinder along the lines, Figure 4 is an external perspective view of the retainer,
Figure 5 is a plan view of the construction key, Figure 6
The figure is a cross-sectional view of the cons tumbler lock taken along lines in Figure 1, showing the construction key inserted into the keyhole, and Figure 7 is a plan view of the duplicate key.
Figure 8 is a cross-sectional view of the cons tumbler lock similar to Figure 6, showing the duplicate key inserted into the keyhole, and Figure 9 showing the construction key device being released as the inner cylinder rotates. 9 is a cross-sectional view similar to FIG. 8 showing a state in which the DESCRIPTION OF SYMBOLS 1... Outer cylinder, 3... Cam groove, 4... Inner cylinder, 7... Partition plate, 8, 9... Retainer, 11... Support shaft, 12... Cons bar, 14... Keyhole, 15... Slot, 16... Tumbler, 18... Unlocking notch, 19... Locking bar, 22... Locking step, 23... Cons spring, 24... Locking tumbler, 25... Engaging portion, 26... Release tumbler, 27... Release pin, 29... Inclined edge.

Claims (1)

[Claims for Utility Model Registration] An outer cylinder in which a cam groove is formed along the generatrix of the inner circumferential surface, and a plurality of partitions rotatably fitted to the outer cylinder and stacked in the direction of the central axis with gaps between them. an inner cylinder having a key hole passed through it along the central axis; an inner cylinder extending along the generatrix of the inner cylinder; and being guided movably in the radial direction on the outer periphery of the inner cylinder; It has a locking bar whose outer edge that engages with the cam groove is biased in the direction of protruding outward, and is provided in each slot between the partition plates with a generally C-shaped overall shape and one end that is swingable. A tumbler is inserted into the locking bar, which is pivoted and biased in a direction to interfere with the side edge of the key inserted into the keyhole, and has an unlocking notch formed on the outer edge of the free end to receive the inner edge of the locking bar. , in which the unlocking notch of each tumbler is aligned with the inner edge of the locking bar when each of these tumblers engages with the corresponding notch of the duplicate key inserted into the keyhole, the inner cylinder having: A cons bar is provided that passes through the inner edge of the free end of each tumbler in the axial direction of the inner cylinder, and at least one of the above tumblers is designated as a rest tumbler, and the inner edge of the free end of each rest tumbler is By forming a locking step and engaging the locking step with the cons bar when the construction key device is actuated, each dormant tumbler is locked in the unlocked position where its unlocking notch is aligned with the inner end of the locking bar. When the cons bar is stopped and inserted into the keyhole, a construction key specifically for construction work having a cutout on the side edge of the part facing the resting tumbler can be used, while the cons bar is guided so as to be movable in its length direction. In addition, one of the pair of adjacent slots facing the notched side edge of the construction key inserted into the keyhole prevents interference with the locking bar when the inner cylinder rotates. First, a locking tumbler is provided whose free end portion interferes with the cons bar, and when the construction key device is activated, the locking tumbler and the cons bar having an engaging portion formed in a portion facing the locking tumbler are mutually engaged. By this, the cons bar is locked in the operating position against the urging force thereof, and on the other hand, a release tumbler for releasing the construction key device is provided in the other of the pair of slots, and a locking tumbler of the unlocking tumbler is provided. A release pin is implanted in the free end of the side surface facing the locking tumbler, and the release pin faces the release step formed on the locking tumbler so that it can be engaged from a direction opposite to the direction in which the locking tumbler is biased. An unlocking notch is formed on the outer edge of the free end of the locking bar to align with the inner edge of the locking bar when the construction key is inserted into the keyhole, and the entire width is ensured in the part facing the release tumbler, or the construction key is inserted into the keyhole. When a duplicate key with a different indentation than the key is inserted into the keyhole, a sloping edge is formed on the free end of the release tumbler that is driven by the duplicate key and moves to a position facing the inner edge of the locking bar. When the inner cylinder is rotated for the first time, the wedge action caused by the engagement between the inner edge of the locking bar and the inclined edge of the release tumbler causes the release tumbler to further rotate in the opposite direction to the biasing direction. , the free end of the locking tumbler is pushed in the direction away from the cons bar through the engagement of the release pin and the release step, and the cons bar released from the locking tumbler is pushed in the longitudinal direction by the biasing force. After moving, the part of the cons bar facing the locking step of each resting tumbler is cut out so as not to interfere with these parts to free the resting tumbler, thereby releasing the construction key device. A lever tumbler lock with a construction key device.