US2230252A - Locking mechanism - Google Patents
Locking mechanism Download PDFInfo
- Publication number
- US2230252A US2230252A US314099A US31409940A US2230252A US 2230252 A US2230252 A US 2230252A US 314099 A US314099 A US 314099A US 31409940 A US31409940 A US 31409940A US 2230252 A US2230252 A US 2230252A
- Authority
- US
- United States
- Prior art keywords
- locking
- bolt
- lug
- adjusting screw
- head space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A3/00—Breech mechanisms, e.g. locks
- F41A3/12—Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
- F41A3/14—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively
- F41A3/16—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks
- F41A3/18—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks hand-operated
- F41A3/22—Rigid bolt locks, i.e. having locking elements rigidly mounted on the bolt or bolt handle and on the barrel or breech-housing respectively the locking elements effecting a rotary movement about the barrel axis, e.g. rotating cylinder bolt locks hand-operated the locking being effected by rotating the operating handle or lever transversely to the barrel axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
- F41A3/00—Breech mechanisms, e.g. locks
- F41A3/64—Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
- F41A3/72—Operating handles or levers; Mounting thereof in breech-blocks or bolts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
- Y10S411/924—Coupled nut and bolt
- Y10S411/929—Thread lock
- Y10S411/942—Tangential key
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20576—Elements
- Y10T74/20582—Levers
- Y10T74/2063—Stops
Definitions
- This invention relates to a locking mechanism, applicable, for example, in providing head space adjustment for firearms.
- Head space is the measure of the length of the large part of the cartridge chamber, considering the face of the bolt, when locked, as the rear end. Variations from this length is likely to result in malfunctionsif shorter, through failure to breech properly; and if larger, through ruptured cartridge cases. In case of excess head space, even though there be no actual rupture of cases, a terric pound results, and this is very severe in its eiiect on the mechanism. If sunicient to cause a rupture, the gun is then completely out of action, as the forward end of the case remains in the chamber after the extracting movement of the bolt and thereby prevents entry of the next cartridge.
- the purpose of this invention is to provide a simple and easily operable mechanism for establishing correct head space.
- the invention is characterized by an adjusting screw which serves to x the longitudinal position of a breech bolt and which is securely held Iin place by a novel locking arrangement.
- Fig. 1 is a plan view of a breech bolt shown in ⁇ the closed and locked position
- Fig. 2 is a sectional View on the line 2-2 of Fig. l, and,
- Fig. 3 is a sectional view on the line 3 3 of Fig. 2.
- a rifle bolt comprising a rear handle portion 5 and a front breech closing portion 6.
- the handle portion 5 includes a lug I whose iront part has a groove 8 for receiving a coupling flange on the front portion 6 and whose rear face 9 projects laterally to be disposed in front of a locking shoulder Ill on the receiver II when the Ibolt is rotated while in its forward or in-battery position.
- the locking shoulder or the rear face 9 of the locking lug is arranged to provide a camming action to facilitate movement of the bolt into locking position.
- the engagement of the lug and the locking shoulder determine the lbreech closing position of the front face of the bolt.
- the locking lug 'I is formed with a longitudinally disposed passage I2 having a reduced threaded bore I3 in its iront part and an enlarged smooth bore Ii in its rear part.
- An adjusting screw l5 having a threaded portion I6 for engagement with the threaded bore I3 is formed with an enlarged head I'I which is disposed in the smooth bore I4.
- the front end of the screw is provided with a recess i3 for receiving a tool whereby the screw is rotated to longitudinally position the rear' face I9 of the head Il'.
- the face i9 engages the locking shoulder It and determines the head space adjustment.
- the head Il is formed with an annular row of teeth 20 having the saine pitch as the threads oi a transversely disposed locking screw 2
- the teeth 20 have a length in excess of the diameter of the locking screw 2l to provide for' engagement of screw 2". and teeth 2u over a relatively large range of ,M
- the operation of varying the head space adjustment or allowing for wear of the parts consists in moving the locking screw 2
- head space adjusting mechanism has been shown mounted in the bolt it is to be understood that it may alternatively be carried by the receiver.
- a breech bolt for a firearm a projecting locking lug on the bolt, an adjusting screw threaded in the lug and having an end projecting from the lug to provide a surface for establishing head space adjustment for the bolt, and means for locking the adjusting screw in place.
- a support In a locking mechanism, a support, an adjusting screw threaded in the support and having a projecting portion providing a positioning surface, an annular row of teeth on the adjusting screw, and a locking screw threaded in the support transversely of the adjusting screw and having threads engaging the annular row of teeth on the adjusting screw.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
Description
Feb. 4,1941. y w. J. LANDEN LOCKING MEGHANI SM `Filed Jam.v 16, 1940 Att xjrnay Patented Feb. 4, 1941 UNITED n STATES PATENT OFFICE (Granted under the act of March 3, 1883, as amended April 30, 1928; 3'70 0. G. 757) The invention described herein may be manufactured and used by or for the Goverment for governmental purposes, without the payment to me of any royalty thereon.
This invention relates to a locking mechanism, applicable, for example, in providing head space adjustment for firearms.
Head space is the measure of the length of the large part of the cartridge chamber, considering the face of the bolt, when locked, as the rear end. Variations from this length is likely to result in malfunctionsif shorter, through failure to breech properly; and if larger, through ruptured cartridge cases. In case of excess head space, even though there be no actual rupture of cases, a terric pound results, and this is very severe in its eiiect on the mechanism. If sunicient to cause a rupture, the gun is then completely out of action, as the forward end of the case remains in the chamber after the extracting movement of the bolt and thereby prevents entry of the next cartridge. If the head space is too great but still not enough so as to cause ruptures, the cases will frequently show incipient ruptures and stretches The purpose of this invention is to provide a simple and easily operable mechanism for establishing correct head space. The invention is characterized by an adjusting screw which serves to x the longitudinal position of a breech bolt and which is securely held Iin place by a novel locking arrangement.
The specilic nature of the invention as well as other objects and advantages thereof will clearly appear from a description of a preferred embodiment as sho-Wn in the accompanying drawing in which:
Fig. 1 is a plan view of a breech bolt shown in` the closed and locked position;
Fig. 2 is a sectional View on the line 2-2 of Fig. l, and,
Fig. 3 is a sectional view on the line 3 3 of Fig. 2.
Referring to the drawing by characters of reference there is shown a rifle bolt comprising a rear handle portion 5 and a front breech closing portion 6. The handle portion 5 includes a lug I whose iront part has a groove 8 for receiving a coupling flange on the front portion 6 and whose rear face 9 projects laterally to be disposed in front of a locking shoulder Ill on the receiver II when the Ibolt is rotated while in its forward or in-battery position.
In the conventional bolt-action rifle the locking shoulder or the rear face 9 of the locking lug is arranged to provide a camming action to facilitate movement of the bolt into locking position. When the bolt is locked the engagement of the lug and the locking shoulder determine the lbreech closing position of the front face of the bolt.
In order to provide for head space adjustment the locking lug 'I is formed with a longitudinally disposed passage I2 having a reduced threaded bore I3 in its iront part and an enlarged smooth bore Ii in its rear part. An adjusting screw l5 having a threaded portion I6 for engagement with the threaded bore I3 is formed with an enlarged head I'I which is disposed in the smooth bore I4. The front end of the screw is provided with a recess i3 for receiving a tool whereby the screw is rotated to longitudinally position the rear' face I9 of the head Il'. In this invention the face i9 engages the locking shoulder It and determines the head space adjustment.
The head Il is formed with an annular row of teeth 20 having the saine pitch as the threads oi a transversely disposed locking screw 2| which is threaded in the lug. The teeth 20 have a length in excess of the diameter of the locking screw 2l to provide for' engagement of screw 2". and teeth 2u over a relatively large range of ,M
displacement of the adjusting screw I5.
The operation of varying the head space adjustment or allowing for wear of the parts consists in moving the locking screw 2| out of engagement with the adjusting screw I5, rotating the adjusting screw to alter the relative longitudinal position of the face I9 and then reengaging the locking screw.
While the head space adjusting mechanism has been shown mounted in the bolt it is to be understood that it may alternatively be carried by the receiver.
Iclaim:
1. A breech bolt for a firearm, a projecting locking lug on the bolt, an adjusting screw threaded in the lug and having an end projecting from the lug to provide a surface for establishing head space adjustment for the bolt, and means for locking the adjusting screw in place.
2. A breech bolt `for a firearm, a projecting locking lug on the bolt, and an adjusting screw threaded in the lug and having an end projecting from the lug to provide a surface for establishing head space adjustment for the bolt.
3. In a locking mechanism, a support, an adjusting screw threaded in the support and having a projecting portion providing a positioning surface, an annular row of teeth on the adjusting screw, and a locking screw threaded in the support transversely of the adjusting screw and having threads engaging the annular row of teeth on the adjusting screw.
WILLIAM J. LANDEN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US314099A US2230252A (en) | 1940-01-16 | 1940-01-16 | Locking mechanism |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US314099A US2230252A (en) | 1940-01-16 | 1940-01-16 | Locking mechanism |
Publications (1)
Publication Number | Publication Date |
---|---|
US2230252A true US2230252A (en) | 1941-02-04 |
Family
ID=23218549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US314099A Expired - Lifetime US2230252A (en) | 1940-01-16 | 1940-01-16 | Locking mechanism |
Country Status (1)
Country | Link |
---|---|
US (1) | US2230252A (en) |
-
1940
- 1940-01-16 US US314099A patent/US2230252A/en not_active Expired - Lifetime
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