公开(公告)号：US3802080A

公开(公告)日：1974-04-09

申请号：US29359772

申请日：1972-09-29

申请人： BEST & DONOVAN

发明人： PETER J

IPC分类号： A22B5/20 ,  B27B9/02 ,  B27G19/04

CPC分类号： A22B5/205 ,  A22B5/206 ,  B27B9/02 ,  B27G19/04

摘要： A safety guard for a scribe saw that protects the entire periphery of the saw''s circular blade when the saw is not in use, and that retracts to a preset depth for regulating the depth of cut desired when the saw is in use. The safety guard structure includes a fixed cover mounted to the saw for protecting one segment of the circular blade, and a movable cover pivotally mounted to the fixed cover for protecting the other segment. The movable cover is adapted to pivot between a closed position and an open position, the movable cover overlying the circular blade''s periphery for protecting against inadvertent contact when in the closed position and exposing the circular blade''s periphery for cutting when in the open position. A trigger is interconnected by latch linkage with the movable cover; the trigger is spring loaded toward a position at which the linkage is disposed over center so as to restrain the movable cover in the closed position against inadvertent contact, and is manually actuable out of the over center position so as to allow the movable cover to retract into the open position as the circular blade is engaged in a cutting attitude. The depth of cut is regulated by limiting retraction of the movable cover. The depth of retraction of the movable cover is adjusted by rotating a depth disc that is eccentrically mounted on the fixed cover. The disc''s periphery is in the nature of an adjustable abutment adapted to cooperate with a fixed abutment on the movable cover, the two abutments engaging or contacting one another to define the maximum limit of the movable cover''s retracting or opening movement.

摘要翻译： 当锯片不使用时，用于划线锯的保护罩可以保护锯片的圆周边缘，并且在锯片被使用时缩回至预定深度以调节切割深度。

公开(公告)号：US3805639A

公开(公告)日：1974-04-23

申请号：US30853272

申请日：1972-11-21

申请人： BEST & DONOVAN

发明人： PETER J

IPC分类号： B23Q11/06 ,  F16P3/10 ,  F16P3/00

CPC分类号： B23Q11/06 ,  F16P3/10 ,  Y10T74/2198 ,  Y10T83/96

摘要： A safety guard for a breaking saw that automatically closes to protect the entire periphery of the saw''s circular blade as soon as the saw''s power is cut off, and that automatically opens to expose the saw''s circular blade for cutting as soon as the saw''s power is turned on. The safety guard structure includes a fixed cover mounted to the saw for protecting one segment of the circular blade, and a movable cover characterized by a pair of clamshells for protecting the other segment. The clamshells are adapted to pivot about the circular blade''s rotational axis between a closed position and an open position, the clamshells overlying the circular blade''s periphery for protecting against inadvertent contact when in the closed position and exposing the circular blade''s periphery for cutting when in the open position. An open/close motor is mounted to the fixed cover for automatically opening and closing the clamshells, the open/close motor also being interconnected with the saw''s drive motor (thereby interconnecting the open/close motor with the drive motor''s off/on switch). The open/close motor is energized when the drive motor''s off/on switch is activated by an operator to commence rotation of the circular blade, thereby automatically retracting the clamshells from the closed to the opened position. The open/close motor is spring loaded to drive the clamshells from the opened to the closed position when the drive motor''s off/on switch is released by the operator, thereby automatically returning the clamshells from the opened to the closed position.

摘要翻译： 一旦切割锯的电源被切断，自动关闭的防爆锯就能自动关闭，以保护锯片的圆形刀片的​​整个周边，并且一旦锯片的电源转动，就会自动打开以露出锯片的圆形刀片进行切割 上。