In November 1941, Bunjiro Hamada filed patent applications for six new mechanisms for his pistol (the Type 1 and the future Type 2). Patent application No. 159203 described an improved slide stop mechanism for automatic weapons. Below is my full translation of the patent application:
Patent No. 159203 (Patent Publication No. 2724 of Showa 18)
Classification: Class 139, 111, Pistol
Application Filing Date: November 29, Showa 16 (1941) Publication Date: June 24, Showa 18 (1943) Date of Patent Grant: September 28, Showa 18 (1943)
Address: 1 Zaimokuza Midarebashi, Kamakura City Patentee (Inventor): Bunjiro Hamada
Representatives (Patent Attorneys): Nobutsugu Sugimura, Shinji Murata, and two others.
Slide Stop Device for a Self-Loading Pistol
Summary and Purpose of the Invention The present invention relates to a device for the automatic stopping of a self-loading pistol’s slide in the rearward position after all cartridges have been exhausted. The design is based on the use of a lever, one arm of which interacts with the follower or the magazine body within the grip well, while the other arm is connected to the slide stopper (slide stop).
Clarification of the Mechanics
Upon removing the magazine, the lever automatically shifts to a disengaged position and is held there—allowing the slide to move freely during disassembly or reassembly. However, when an [empty] magazine is inserted, the lever enters a corresponding notch (hole) in the slide, ensuring it is locked in the rearward position. The objective of the invention is to enable the immediate opening of fire directly after replacing an empty magazine with a full one : upon inserting a new magazine, the slide is released, making the handling of the weapon fast and safe in critical situations.
The present invention relates to a device designed for the automatic stopping of the slide in a self-loading pistol in cases where it is necessary to remove the magazine after all cartridges have been fired, or when the pistol is in an assembled state.
On the drawings: (1) — pistol frame; (2) — slide; (3) — pistol body; (4) — magazine; (5) — follower; (6) — follower spring. In the present invention, a lever (7) of a specific curved shape is pivotally mounted on an axis (8) within the body of the weapon and is tensioned by a spring (9), which constantly tends to rotate it to the left (counter-clockwise), as shown in Fig. 1. The tip of the lever arm (7) protrudes into the magazine well, and when a magazine is inserted, it is held by the magazine wall in the position shown by the solid line in Fig. 1. The other arm of the lever (7) is directed forward, and its tip — the stopper (10) — enters a recess and is pivotally connected to a pin (12) installed in the body. Under the action of the spring (13), the vertical locking pin (14) is constantly pushed upward, tending to enter the hole (15) in the slide when it moves to the rearward position. However, as long as the lever (7) is locked in the lower position [by the inserted magazine], the locking pin remains recessed. (16) — magazine catch, (17) — sear, (18) — trigger.
According to the device of the present invention, when a magazine is inserted into the pistol, the side wall of the magazine presses against the tip of the lever arm (7), as described above. As a result, the lever (7) holds the stopper (10) in the lower position—that is, in a disengaged state—as long as cartridges remain in the magazine, allowing the slide to perform reciprocating movements during firing without any obstruction. However, after all cartridges in the magazine have been fired, the follower (5) is pushed upward by the action of the spring (6), as shown in Fig. 1, and its protrusion (19) stops and holds the slide (2) in the rearward position. Upon removing the magazine for reloading, the tip of the lever arm (7) moves beyond the magazine wall and rotates to the left under the action of the spring (9). Subsequently, the stopper (10) moves upward under the action of the spring (13), causing the pin (14) to enter the hole (15), thereby locking the slide in this position. Thus, even after the magazine is removed, the slide (2) remains held in the rearward position. Then, when a magazine loaded with cartridges is installed into the pistol, the magazine wall again presses against the tip of the lever arm (7), which, via the stopper (10), retracts the pin, whereby the pistol is immediately brought into a state of readiness for firing.
As described above, according to the present invention, the slide automatically stops in the rearward position after all cartridges have been fired. Due to this, upon removing the magazine and subsequently inserting a magazine loaded with cartridges, the weapon can be immediately brought into a state of readiness for use. This completely eliminates the inconveniences that existed previously and provides a tremendous advantage.
Claim
As described in detail in the text and shown in the drawings, a lever is installed in the pistol body, one arm of which is positioned to be controlled by the presence or absence of a magazine in the well, while the other arm is pivotally connected to a stopper. When the magazine is in the installed position, the aforementioned stopper is held in a disengaged position; however, upon removal of the magazine, the stopper automatically protrudes into the slide opening, ensuring its stoppage in the rearward position — this constitutes the distinct feature of this automatic slide stop device for a self-loading pistol.
Therefore, during reloading, the soldier should not have to interact with the pistol’s slide or manually release it from the slide stop, as the pistol automatically chambers a round upon magazine replacement. In contrast, the Hamada pistols (Type 1 and Type 2) in the game currently feature a standard slide stop mechanism, lacking the automatic chambering of a round during a full reload.
The reload speed of the Type 1 and Type 2 in the game looks particularly ridiculous, as it is among the worst compared to its counterparts. In general, it is worth noting that Japanese pistols in the game are not known for their reload speed. The old Mauser C96, fed by stripper clips, even beats the Type 2, which should feature automatic chambering.
| Weapon Name | Fraction | Damage (10m) | Ammo | Full Reload | Tactical Reload |
|---|---|---|---|---|---|
| Colt M1911A1 | USA/Brit. | 6.5 | 7 (+1) | 2.0 | 1.5 |
| Walther PP | Germany | 5.0 | 8 (+1) | 2.0 | 1.5 |
| Walther PPK | Germany | 5.0 | 7 (+1) | 2.0 | 1.5 |
| Walther P38 | Germany | 5.5 | 8 (+1) | 2.0 | 1.5 |
| TT | USSR | 5.3 | 8 (+1) | 2.0 | 1.6 |
| Beretta M1934 | Germany | 5.0 | 7 (+1) | 2.0 | 1.6 |
| Yazykov SMG (Pistol) | USSR | 6.6 | 15 | 2.0 | 1.8 |
| Browning Hi-Power | USA/Brit. | 5.5 | 13 (+1) | 2.0 | — |
| Astra 300 Luxe | USSR | 5.2 | 6 (+1) | 2.0 | — |
| Mauser C96 | USSR/Ger. | 5.3 | 10 | 2.0 | — |
| TK (Korovin) 1926 | USSR | 4.4 | 8 (+1) | 2.2 | — |
| Voevodin Pistol | USSR | 5.1 | 18 (+1) | 2.3 | 1.7 |
| Beretta M1923 | Germany | 5.3 | 7 (+1) | 2.3 | 1.8 |
| Luger P08 | Germany | 5.5 | 8 (+1) | 2.4 | 2.0 |
| Type 94 | Japan | 5.3 | 6 (+1) | 2.5 | 2.0 |
| Mauser C96 Mod. 712 | Germany | 5.3 | 20 | 2.5 | 2.1 |
| Artillery Luger | Germany | 6.8 | 32 (+1) | 2.5 | 2.3 |
| Type 14 | Japan | 5.3 | 8 (+1) | 2.6 | 2.1 |
| CZ vz. 27 | Germany | 5.0 | 8 (+1) | 2.6 | 2.3 |
| Welrod Mk II | USA/Brit. | 5.0 | 8 (+1) | 2.6 | 1.9 |
| Type 2 | Japan | 5.3 | 6 (+1) | 2.7 | 2.2 |
| Schwarz-Colt M1911 | USA/Brit. | 6.5 | 18 | 2.7 | 2.3 |
| Type 1 | Japan | 5.0 | 9 (+1) | 2.8 | 2.3 |
| Smith & Wesson M1917 | USA/Brit. | 6.5 | 6 | 3.0 | 2.0 |
| Sword Pistol Type A | Japan | 5.3 | 8 (+1) | 3.2 | 2.9 |
| Mars Automatic Pistol | USA/Brit. | 8.5 | 8 (+1) | 4.0 | 3.0 |
| Liberator | USA/Brit. | 7.2 | 1 | 4.0 | — |
- Yes
- No
