Thumb safety for model 1911 handgun

1. A semiautomatic pistol thumb safety coupled to a frame of a semiautomatic pistol adjacent a slide of the pistol, the thumb safety comprising: a safety body movably mounted to the frame of the pistol so that the safety body is movable between a fire position and a safe position, wherein actuation of the pistol is prevented, the safety body comprising an outer facing surface, an inner facing surface, a top portion, and a projection formed along the top portion of the safety body and including a sloping forward surface; wherein the slide of the pistol includes a length, with a lower edge extending along the length of the slide; and wherein the forward surface of the projection is moved substantially into alignment with the lower edge of the slide of the pistol when the safety body is moved to the safe position such that the slide is movable along the forward surface of the projection sufficient to clear a chamber of the pistol while engagement of the lower edge of the slide with the forward surface of the projection of the safety body maintains the safety body in the safe position such that the safety body cannot be moved from the safe position to the fire position unless the slide of the pistol is in battery.

2. The semiautomatic pistol thumb safety of claim 1 , wherein the thumb safety further comprises a sear engaging member projecting from the inner facing surface of the safety body and including a series of engagement surfaces adapted to engage a sear of the pistol upon movement of the safety body to the safe position to render the sear non-operative.

3. The semiautomatic thumb safety of claim 1 , wherein the thumb safety comprises an ambidextrously operable safety.

4. The semiautomatic thumb safety of claim 3 , further comprising a first engagement tab formed along the outer facing side of the safety body, and a safety body having a second engagement tab mounted along an ambidextrous operating side of the pistol to enable ambidextrous operation of the thumb safety.

5. The semiautomatic pistol of claim 2 , wherein the pistol comprises a model 1911 semiautomatic pistol.

6. A semiautomatic pistol comprising: a frame; a hammer, a sear, a barrel and a slide movable with respect to the frame and having a bottom edge extending along a length thereof; a fire control; and a safety movably coupled to the frame, the safety having a safety body with a sear engaging member projecting from the safety body toward the sear, and a blocking feature formed along a portion of the safety body adjacent the slide and defining a cam profile, including a cam surface, wherein the cam surface of the blocking feature is moved toward engagement with the bottom edge of the slide of the pistol when the safety body is moved from a first position to a second position whereby the sear engaging member engages to retain the sear in a non-operative position to prevent actuation of the pistol, and wherein the slide remains operable, being movable along the cam surface of the blocking feature while maintaining the safety body in the second position such that the safety body cannot be moved from the second position to the first position unless the slide of the pistol is in battery.

7. The semiautomatic pistol of claim 6 , wherein the sear engaging feature comprises a rotatable stub shaft having a series of engagement surfaces to engage the sear.

8. The semiautomatic pistol of claim 6 , wherein the pistol comprises a model 1911 semi-automatic pistol.

9. The semiautomatic pistol of claim 6 , wherein actuation of the safety is enabled from an operating side and an ambidextrous operating side of the pistol.

10. The semiautomatic pistol of claim 9 , wherein a second blocking feature is formed along the ambidextrous operating side of the pistol.

11. The semiautomatic pistol of claim 10 , wherein the pistol comprises a model 1911 semi-automatic pistol.

12. A handgun, comprising:

a frame;

a barrel extending along a portion of the frame;

a slide movably mounted to the frame, the slide movable between a forward position and a rearward position and including a lower edge extending along the slide;

a hammer pivotally mounted to the frame;

a sear movable between a first position blocking movement of the hammer and a second position wherein the hammer is released;

a fire control connected to the sear and having a trigger for actuating firing of the handgun; and

a thumb safety adjacent the slide and movable between fire and safe positions; the thumb safety comprising:

a safety body pivotally mounted to the frame;

a sear engaging member extending from the safety body and adapted to engage the sear and resist movement of the sear upon actuation of the trigger so as to block operation of the hammer when the thumb safety is moved to the safe position; and

a cam projection having a sloped cam surface formed along the safety body, wherein when the thumb safety is in the safe position, the cam surface of the cam projection is aligned along the lower edge of the slide such that the slide can move over the cam projection between the forward and rearward positions while the movement of the safety body so as to move the thumb safety away from the safe position is blocked by engagement between the cam projection and the lower edge of the slide to prevent release of the hammer while still permitting operation of the slide of the handgun when the safety is in its the safe position and such that the safety body cannot be moved from the safe position to the fire position unless the slide of the handgun is in the forward position.

13. The handgun of claim 12 , wherein actuation of the safety is enabled from an operating side or an ambidextrous operating side of the pistol.

14. The handgun of claim 12 , further comprising a first engagement tab formed along the outer facing side of the safety body on a first side of the frame, and a second engagement tab mounted along a second side of the frame and connected to the safety body to enable ambidextrous operation of the thumb safety.

15. The handgun of claim 12 , wherein the pistol comprises a model 1911 semi-automatic pistol.

16. The handgun of claim 12 , wherein the thumb safety further comprises a sear engaging member projecting from the inner facing surface of the safety body and including an engagement surface adapted to engage the sear upon movement of the thumb safety to its safe position to retard movement of the sear as the slide is moved between its forward and rearward positions.

17. A handgun comprising a frame, a sear, a slide movable with respect to the frame and having a lower edge extending along a length of the slide; and an ambidextrous thumb safety adjacent the slide and movable between a fire position and a safe position engaging and blocking movement of the sear, the thumb safety comprising:

a first safety body located along an operating side of the frame;

a second safety body located along an ambidextrous operating side of the frame; and

a blocking feature comprising a raised projection having a sloped forward surface formed along the second safety body;

wherein when the thumb safety is in the safe position, the forward surface of the blocking feature is moved to a position substantially aligned along the lower edge extending along the length of the slide such that the slide can move over the forward surface of the blocking feature between a forward position and a rearward position while movement of either safety body so as to move the thumb safety away from the safe position is substantially blocked by engagement between the blocking feature and the lower edge of the slide to prevent release of the sear while still permitting operation of the slide of the handgun when the thumb safety is in the safe position and such that the thumb safety cannot be moved from the safe position to the fire position unless the slide of the handgun is in the forward position.

18. The handgun of claim 17 , wherein the thumb safety further comprises a sear engaging member projecting from the inner facing surface of the safety body and including an engagement surface adapted to engage the sear upon movement of the thumb safety to the safe position to retard movement of the sear as the slide is moved between the forward and rearward positions.

19. The handgun of claim 17 , wherein the pistol comprises a model 1911 semi-automatic pistol.