Abstract: A fall detection sensor for a rammer includes an acceleration sensor, a low-pass filter, an integrator, a first comparator, a second comparator, and control means. The second comparator compares wave patterns of input signals with a plurality of types of fall sample waves and non-fall sample waves stored in advance. The second comparator outputs a fall detection signal upon determining that the rammer has fallen when the similarity with one of the fall sample waves exceeds a threshold, and the second comparator outputs a non-fall signal upon determining that the rammer has not fallen when the similarity with one of the non-fall sample waves exceeds a threshold.

Abstract: Provided is a fall detection sensor for rammer capable of determining a fall state of a rammer, that operates with a large vibration and impact, with high accuracy, and stopping a motor (an engine or the like) immediately. The fall detection sensor for rammer includes an acceleration sensor (2), a low-pass filter (3), an integrator (4), a first comparator (5), a second comparator (6), and control means (7). The second comparator (6) compares wave patterns of input signals (x?-z?) with a plurality of types of of fall sample waves (FW) and non-fall sample waves (NFW) stored in advance. The second comparator (6) outputs a fall detection signal (fs) upon determining that the rammer has fallen when the similarity with the fall sample wave (FW) exceeds a threshold, and the second comparator (6) outputs a non-fall signal (nfs) upon determining that the rammer has not fallen when the similarity with the non-fall sample wave (NFW) exceeds a threshold.

Abstract: An engine stop switch and a fuel open-close lock are accommodated in a throttle lever case so that they can be easily disassembled, and the engine stop switch is turned on and off and the fuel open-close cock is opened and closed adequately by the actuation of a rotary valve in response to the turning of a lever. An engine stop switch and a fuel open-close lock are integrally incorporated in a throttle lever case, a partially toothless driven gear is intermittently rotated via a partially toothless drive gear rotated by a lever, and the intermittent rotation of the partially toothless driven gear turns on/off the engine stop switch and opens/closes the fuel open/close cock.

Abstract: The present invention provides a protective cover structure for a rammer for which a guard cover plate of a power engine in a rammer is molded from a synthetic resin allowing any shape to be freely obtained and having small weight, high strength, and impact absorption ability. The cover plate is configured so that it can be assembled and disassembled by simple operations, has good endurance with respect to severe vibrations and can reduce the damage of the machine body due to the adequate impact absorption ability even when the rammer tumbles. Front end sections of guard covers disposed on both sides of a power engine are joined and fixed to the front surface section of the crank chamber, lower sections of the rear portions are supported by support frames of a protective stand provided at the lower surface of the power engine, and the rear sections of the rear portions are linked integrally by a linking transverse pole.

Abstract: An engine stop switch and a fuel open-close lock are accommodated in a throttle lever case so that they can be easily disassembled, and the engine stop switch is turned on and off and the fuel open-close cock is opened and closed adequately by the actuation of a rotary valve in response to the turning of a lever. An engine stop switch and a fuel open-close lock are integrally incorporated in a throttle lever case, a partially toothless driven gear is intermittently rotated via a partially toothless drive gear 4 rotated by a lever 6, and the intermittent rotation of the partially toothless driven gear turns on/off the engine stop switch and opens/closes the fuel open/close cock.

Abstract: In a vibration compaction machine such as a rammer, a lining wear dust is prevented from accumulating inside a clutch drum due to oblique attachment of a centrifugal clutch, such that the input shaft side is high and the output shaft side is low because of a forward tilted posture of the machine body. Discharge ports for a lining wear dust are opened with a spacing therebetween in a corner section of a disk-shaped wall surface and an annular circumferential surface of a clutch drum in a centrifugal clutch that is disposed obliquely so that the input shaft is high and an output shaft is low, the discharge ports being obtained by cutting out portions of the annular circumferential surface close to the corner section.