Mazda Motor Corporation

Toyo Kogyo Co., Ltd.

Tohru Mashimo

Takakazu Yamane

Tadamitsu Nakahama

Makoto Aizawa

Kazuo Hironaka

Osamu Satoh

Yukifumi Taniguchi

Hironori Umeda

Kazumoto Tanaka

Toyohiko Kobayashi

Takashi Nishio

Osamu Sato

A surface coating applied to a subject surface includes an undercoating, a color base layer, coated over the undercoating layer, which contains a coloring material, and a color clear layer, coated over the color base layer, which contains a coloring dye of a hue within +/-10 from a hue of the coloring material of the base color layer on the 100-division Mansell hue ring.

Surface coating and method of applying the same

A surface coating applied to a subject surface includes an undercoating, a color base layer, coated over the undercoating layer, which contains a coloring material, and a color clear layer, coated over the color base layer, which contains a coloring dye of a hue within +/-10 from a hue of the coloring material of the base color layer on the 100-division Mansell hue ring. The color clear layer may be applied with a paint spray device while rotating the subject surface around an axis and continuously moving the subject surface along the axis to form a spiral pattern of paint spray relative to and around the subject surface at regular pitches. Preferably, the ratio of each of the regular pitches to a width of the pattern of paint spray is less than 0.3.

Method of applying a surface coating

A drilling method of drilling an imaginary facing for excavating a curved tunnel such that the imaginary facing is nonparallel to an existing facing. The drilling method includes the steps of obtaining a first equation for transformation between a primary coordinate system defined with respect to the imaginary facing and a secondary coordinate system defined with respect to the existing facing, transforming a primary drilling pattern of the primary coordinate system into a secondary drilling pattern of the secondary coordinate system, obtaining a second equation for transformation between the secondary coordinate system and a final coordinate system defined with respect to a drilling vehicle, and transforming the secondary drilling pattern to a final drilling pattern of the final coordinate system.

Control method for drilling apparatus which makes use of a final

An explosive charging apparatus for charging controlled amount of explosives sequentially to bores drilled in a rock surface. The charging apparatus includes an explosive charging pipe, a boom mechanism carrying the explosive charging pipe, boom actuators for actuating the boom mechanism so that the explosive charging pipe is moved to a desired position, a control circuit for controlling the boom actuators and the explosive charging pipe. The control circuit includes a memory circuit having memories concerning locations, directions and depths of bores drilled in a rock surface, a processor for addressing memories of one of the bores in the memory circuit, a transducer for converting the addressed memories in the memory circuit to values of movements of the boom actuators, a servo control circuit for receiving outputs from the transducer and controlling operations of the boom actuators to locate the explosive charging pipe against one of the bores drilled in the rock surface, a charge depth setting device for setting a desired depth of explosive charging, a charge control circuit operable upon completion of operation of the servo control circuit for controlling the explosive charger so that explosives are charged to the desired depth in accordance with outputs of the charge depth setting device and applying a signal to the processor upon completion of explosive charging operation so that memories on another bore is addressed to perform another cycle of operation.

Explosive charging apparatus for rock drilling

This invention relates to an automatically controlled rock drilling apparatus which performs rock drilling operations as well as post-drilling operations such as explosive charging. Memory means are used during the drilling operation and reused during subsequent operations for follow-up work, specifically the charging of explosive to the drilled bores.

Automatically controlled rock drilling apparatus

A drilling apparatus includes a drilling rod, a feed motor for advancing and retreating the rod in relation to an object to be drilled, and a control system for controlling the movement of the rod. The control system includes a pulse generator for producing one long duration pulse upon completion of each rotation of the drilling rod, an oscillator for producing high frequency pulses, a counter for counting the number of high frequency pulses during the long duration pulse, and a control circuit for controlling the feed motor in response to the counted number of pulses, the control system operating so that the counted number of high frequency pulses equals a predetermined number during the period of the long duration pulse. The control system is arranged to increase the advancing force of the drilling rod when its rotational speed increases (i.e.-when the counted number of high frequency pulses decrease) and the control system is arranged to decrease the advancing force of the drilling rod when its rotational speed decreases (i.e.-when the counted number of high frequency pulses increase). Thus, the control system stabilizes the rotational speed of the drilling rod by advancing and retreating the rod, thereby optimizing the drilling operation.

Growing community of inventors

Hiroshima, Japan

Tohru Mashimo