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Tripod Turnstile Gate
The Madoors USA MDRS-B-400 Tripod Turnstile Gate is a waist-height three-arm turnstile system designed for efficient pedestrian access control in dense and crowded public transport areas, metro, tram and train lines, airports, factories, trade centers, public buildings, banks, schools, universities, and libraries — allowing only one person to pass at a time for effective security prevention and restriction of unauthorized access. With cast core mechanism construction that prevents arm gap development over years of use, shock absorber systems ensuring constant arm speed completion regardless of passing speed, bidirectional operation with three-position illuminated green arrow and red X direction indicators, and a -20°C to +60°C operating temperature range for year-round outdoor and indoor deployment, the Madoors USA MDRS-B-400 is the reliable, long-service tripod turnstile for any high-traffic pedestrian access control application.
TECHNICAL SPECIFICATIONS
The Madoors USA MDRS-B-400 is a three-arm waist-height tripod turnstile — the three arms are positioned at 120-degree spacing on the rotating hub, providing one arm across the pedestrian passage at all times in the locked position. Each arm rotation of 120 degrees allows one person to pass — the next arm immediately presents to the passage position after the previous passage is completed, ensuring continuous one-person-per-pass enforcement at any traffic throughput rate.
The core mechanism is manufactured from cast material — casting produces a single solid metal component for the mechanism hub, arm mounts, and rotation bearings without the dimensional variation and progressive joint loosening of assembled multi-component mechanisms. Cast construction directly prevents the arm gap development that occurs over years of use in non-cast turnstile mechanisms — the cast hub maintains the precise arm spacing and rotation geometry throughout the full service life without adjustment or replacement.
The shock absorber system is integrated into the turnstile arm mechanism — when an authorized person pushes the arm quickly, the shock absorber absorbs the kinetic energy of the fast push and releases it progressively, ensuring the arm completes its 120-degree rotation at a constant, controlled speed regardless of the initial push force. This constant-speed arm completion prevents the arm from swinging past the locked position at high speed, which would create the opportunity for a second person to slip through before the arm locks — directly maintaining the one-person-per-pass security function at all pedestrian approach speeds.
The bidirectional operation allows authorized passage in both directions — both the entry and exit directions are controlled by the same tripod turnstile unit. Three-position illuminated indicators on both passage direction faces provide the access status communication required for pedestrian flow management. When the turnstile is ready to pass — authorization received — the green arrow blinks continuously, indicating to the approaching pedestrian that their credential has been accepted. When the turnstile allows passage — person actively passing — the green arrow illuminates continuously. During passage in one direction, the red X sign illuminates on the opposite direction indicator — confirming that reverse direction passage is prohibited during the active passage cycle.
The -20°C to +60°C operating temperature range confirms reliable year-round operation at outdoor installations in all climatic conditions — the mechanism, electronics, and indicator lights all maintain consistent performance across the full temperature range without cold-weather stiffening or high-temperature degradation.
KEY FEATURES
Three-Arm 120-Degree Configuration — One Person Per Pass
The three-arm 120-degree spacing configuration is the defining physical security characteristic of the tripod turnstile — the arm spacing allows only one person at a time within the rotation arc, and the 120-degree rotation to the next locked position completes before a second person can enter the passage. This physical one-person-per-pass enforcement operates continuously and passively without any electronic override requirement, directly ensuring that every passage event corresponds to exactly one authorized credential presentation.
Cast Core Mechanism — Permanent Dimensional Integrity
The cast core mechanism construction is the engineering quality characteristic that distinguishes the MDRS-B-400 from assembled multi-component mechanism turnstiles — the solid cast hub maintains the precise arm gap and rotation geometry throughout the complete service life without the progressive loosening, wear, and gap development that assembled mechanisms experience. This permanent dimensional integrity directly confirms that the turnstile will be used safely for many years without the mechanism degradation that reduces security performance in lower-quality tripod turnstiles.
Shock Absorbers — Constant-Speed Arm Completion
The shock absorber system that ensures constant arm completion speed regardless of push force directly addresses the tailgating vulnerability of shock-absorberless tripod turnstiles — without shock absorption, a fast, hard push can swing the arm past the locked position at sufficient speed to allow a second person to pass before the arm reaches and locks at the next 120-degree position. The shock absorber prevents this overshoot by absorbing the excess kinetic energy and controlling the final phase of arm rotation to the locked position at constant speed.
Three-Position Illuminated Indicators — Clear Pedestrian Communication
The three-position illuminated indicator system — blinking green arrow for ready to pass, continuous green arrow for actively passing, and red X for opposite direction prohibited — provides the complete access status communication required for smooth, confident pedestrian flow at high-traffic access points. The three distinct states eliminate the pedestrian hesitation and gate blocking that single-indicator or no-indicator turnstiles create, directly improving throughput efficiency at busy installations.
Bidirectional Operation — Entry & Exit from Single Unit
The bidirectional operation allowing authorized passage in both directions from the same tripod turnstile unit directly reduces the number of turnstile units required at access points with simultaneous entry and exit traffic — a single MDRS-B-400 manages both flow directions rather than requiring separate entry and exit units. This bidirectional efficiency is particularly valuable at the space-constrained access points of metro stations, factory gates, and university entrances where available installation width is limited.
-20°C to +60°C — All-Climate Year-Round Operation
The -20°C to +60°C temperature range confirms reliable operation across the complete global climate range — arctic winter conditions at northern transit and industrial installations, and desert summer heat at Middle Eastern and tropical installations. This temperature range eliminates the climate-specific hardware specification concern for international projects and ensures year-round operational availability at all installation locations.
High-Traffic Application Range
The specific design objective for dense and crowded areas — public transport, metro, tram and train lines, airports, factories, trade centers, public buildings, banks, schools, and universities — confirms the MDRS-B-400 as engineered for the highest pedestrian traffic volumes encountered in commercial and institutional access control. The combination of cast mechanism durability, shock absorber controlled cycling, and continuous bidirectional operation directly provides the high-cycle reliability required for the thousands of daily passages at busy transit and institutional access points.
PRODUCT RANGE
MDRS-B-400 Standard
Three-arm cast mechanism, shock absorbers, bidirectional, three-position illuminated indicators, -20°C to +60°C. Standard indoor and outdoor pedestrian access control.
MDRS-B-400 Stainless Steel
Brushed stainless steel enclosure and arm finish for premium architectural and outdoor corrosion-resistant installations.
MDRS-B-400 with Access Control Integration
Card reader, fingerprint, or QR code reader integration for authorized credential-based passage control.
ASSEMBLY & INSTALLATION SEQUENCE
Installation Position & Direction Configuration
Lane width, passage directions, indicator visibility from pedestrian approach positions, access control reader integration, power supply, and floor surface are confirmed.
Base Plate Fixing
Floor anchor positions are marked and anchor bolts are installed. The tripod turnstile base plate is positioned and secured to the confirmed anchor bolt positions.
Arm & Mechanism Assembly
The three-arm assembly is installed on the cast core mechanism hub. Arm spacing at 120-degree intervals and smooth rotation through the full cycle are confirmed. Shock absorber function is tested — constant-speed arm completion from fast and slow push inputs is verified.
Indicator Light & Control Connection
Three-position illuminated indicators on both direction faces are connected to the power supply and access control signal interface. Blinking green, continuous green, and red X indicator states are tested for all transition scenarios.
Access Control System Integration
Card reader, biometric, or other credential device is connected to the turnstile control system. Authorized passage, unauthorized lock, and emergency free-pass function are programmed and tested.
Bidirectional Operation Testing
Complete bidirectional passage testing — authorized entry, authorized exit, simultaneous attempted entry and exit, and indicator status at each stage — is conducted. One-person-per-pass enforcement is confirmed at fast and slow passage speeds.
Operational Testing & Handover
Complete operational testing at high-cycle throughput rates, temperature range compliance confirmation, and installation handover documentation are completed.
DEPLOYMENT SCENARIOS & USE CASES
Madoors USA MDRS-B-400 Tripod Turnstile Gates are specified for any high-traffic pedestrian access control position requiring reliable one-person-per-pass waist-height turnstile control.
- Metro and underground railway station turnstile gates
- Tram and light rail station pedestrian access control
- Train station and railway terminal turnstiles
- Airport terminal and transit hub pedestrian control
- Factory and industrial facility worker entrance turnstiles
- Shopping center and trade center pedestrian access
- Public building and government facility entry turnstiles
- Bank and financial institution entrance turnstiles
- University and educational campus access turnstiles
- School entrance pedestrian access control
- Sports stadium and event venue entry turnstiles
- Library and cultural institution access control
- Hospital and healthcare facility visitor turnstiles
- Corporate office building lobby access turnstiles
- Any high-traffic pedestrian access point requiring durable bidirectional one-person-per-pass tripod turnstile control
- Category: Access Control Systems