U.S. patent application number 16/051460 was filed with the patent office on 2020-02-06 for toggle trigger.
The applicant listed for this patent is Martin Dieter Lobert. Invention is credited to Martin Dieter Lobert.
Application Number | 20200041222 16/051460 |
Document ID | / |
Family ID | 69228491 |
Filed Date | 2020-02-06 |
United States Patent
Application |
20200041222 |
Kind Code |
A1 |
Lobert; Martin Dieter |
February 6, 2020 |
Toggle Trigger
Abstract
A trigger mechanism for a firearm which has a light trigger
pull, reliably contains the high forces of the firing pin spring
and achieves this with a mechanism which is simple and with few
parts. A toggle linkage prevents the firing pin retainer releasing
the firing pin whilst still allowing a light pull. It contains no
internal sear and no pins within the toggle mechanism. It is
adjustable for variations in manufacturing and can cater for
various levels of trigger pull force. It realizes considerable
economies for production, assembly and repair without sacrificing
functionality.
Inventors: |
Lobert; Martin Dieter; (Edge
Hill, AU) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Lobert; Martin Dieter |
Edge Hill |
|
AU |
|
|
Family ID: |
69228491 |
Appl. No.: |
16/051460 |
Filed: |
July 31, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F41A 19/17 20130101;
F41A 19/10 20130101; F41A 19/16 20130101 |
International
Class: |
F41A 19/17 20060101
F41A019/17; F41A 19/10 20060101 F41A019/10 |
Claims
1. A trigger assembly for use with firearms comprising: a) Two
sheets of material which act as an external chassis for internal
parts; b) A lower toggle which is pivotally attached to said sheet
chassis; c) A firing pin retainer which is pivotally attached to
said sheet chassis; d) An upper toggle being free floating and
self-constrained between said lower toggle and said firing pin
retainer with said upper toggle having pointed, near pointed or
slightly radiused ends; e) A toggle linkage being the combination
of said lower toggle and upper toggle; f) A geometric tipping line
being a straight line between each end of said toggle linkage; g)
Said toggle linkage being a rigid set when arranged ante said
tipping line; h) A trigger shoe which is pivotally attached to said
sheet chassis; i) A trigger shoe adjustment screw attached to said
trigger shoe; j) Said trigger shoe adjustment screw being in
operational communication with said toggle linkage; k) A torsion
spring being grounded at one end with the other end applying force
to said toggle linkage; l) Whereby when said trigger shoe is pulled
causing said trigger shoe adjustment screw to move said toggle
linkage forward and collapse said toggle linkage as toggle linkage
is moved post said tipping line; m) Whereby when said toggle
linkage collapses said firing pin retainer rotates downward
releasing firing pin and firing the firearm; n) Whereby said
trigger shoe adjustment screw may be adjusted to control bias
between said toggle linkage and said tipping line; o) Whereby
adjustment of said trigger shoe adjustment screw introduces no lost
motion.
2) The trigger assembly in accordance with claim 1 further
comprising of an overtravel adjustment screw for said trigger
shoe.
3) The trigger assembly in accordance with claim 1 further
comprising of an undertravel adjustment screw for said trigger
shoe.
4) The trigger assembly in accordance with claim 1 further
comprising of a firing pin retainer adjustment screw for adjustment
of free-play in said toggle linkage.
5) The trigger assembly in accordance with claim 1 in modified form
comprising said torsion spring installed in an inverted position to
increase force of trigger pull.
6) The trigger assembly in accordance with claim 1 wherein the
external chassis sheet may be profile cut from sheet material;
7) The trigger assembly in accordance with claim 1 wherein internal
parts being said lower toggle said upper toggle said trigger shoe
and said firing pin retainer may be profile cut from plate
material;
8) The trigger shoe adjustment screw of claim 1 being able to be
adjusted from beneath with the trigger in situ in the firearm;
9) The adjustment screw of claim 2 being able to be adjusted from
beneath with the trigger in situ in the firearm;
10)The adjustment screw of claim 3 being able to be adjusted from
beneath with the trigger in situ in the firearm;
11)The adjustment screw of claim 4 being able to be adjusted from
beneath with the trigger in situ in the firearm.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] This invention relates to a trigger assembly for firearms
including target rifles. The mechanism provides for a light trigger
pull whilst greatly simplifying the mechanism.
Description of Prior Art
[0002] To enhance accuracy a great many shooters, desire the
lightest trigger pull possible. However, the trigger must contain
the high force of the firing pin spring to prevent inadvertent
firing. Usually this force is contained by a sear type of
arrangement. A sear may be described as a physical impasse being a
block, other analytic or primitive shape or part, aligned with a
mate to block movement until such time as it is moved. A trigger
that is set too light or with too little sear engagement can have a
tendency to go off prematurely. Containing the high force of the
firing pin spring is thus at odds with the idea of a light trigger
pull.
[0003] Referring to FIG. 1, a conventional trigger is in the cocked
position. In this position a firing pin 13 is held back by a firing
pin retainer 12. The firing pin retainer 12 is held in position by
a trigger shoe 11. This is accomplished by the interaction of a
sear shown in (A).
[0004] Referring to FIG. 2, the conventional trigger has been
fired. Trigger shoe 11 is pulled and rotates around pin 14. This
releases the sear and allows the firing pin retainer 12 to rotate
around pin 15 releasing the firing pin 13 which moves forward and
causes the firearm to fire.
[0005] The sear is under great load and thus these triggers have
both a heavier than desirable pull and have lost motion or creep
when in use. To reduce the effect of this load and reduce creep,
the sear and its mate must be both precisely geometrically aligned
to provide only an iota of engagement and are often highly
polished, usually by hand, resulting in intricate and
time-consuming work.
[0006] Other alternate designs are difficult, expensive and
geometrically complex, with a relatively high number of moving
parts and are therefore complicated to manufacture. They
predominantly use a large number of pins within said mechanisms and
the precise alignment thereof requires unnecessarily tight
tolerances and are thus arduous to produce, assemble and
repair.
BRIEF DESCRIPTION OF THE INVENTION
[0007] The invention overcomes these difficulties by being able to
facilitate a light trigger pull, prevent premature firing,
eliminate lost motion and significantly reduces excess complexities
in manufacturing, the combination of these factors being the
consummate goal of shooters and manufacturers. The trigger internal
parts are contained between two outer sheets creating a chassis.
The internal parts of the trigger consist of two toggles being a
lower toggle, and a free-floating upper toggle.
[0008] Other parts are a trigger shoe, a torsion spring and a
firing pin retainer. The invention does not rely on an internal
sear nor any pins between the lower toggle, free-floating upper
toggle and firing pin retainer. This is accomplished by having the
lower toggle and free floating upper toggle aligned to create a
geometrically rigid structure beneath the firing pin retainer. The
combination of the lower toggle and free-floating upper toggle may
also be described as the toggle linkage. This toggle linkage rests
upon a trigger shoe with an adjustable screw at a point along its
length. The trigger shoe and adjustable screw provide a stop for
the toggle linkage. A torsion spring provides a pre-load to keep
the toggle linkage against the adjustable screw of the trigger shoe
and also provides a force to reset the mechanism for the next
cycle.
[0009] When the trigger shoe is pulled it rotates and causes the
adjustable screw to push the toggle linkage beyond its tipping
point. At this stage the force of the firing pin spring via the
firing pin which itself is pushing on the firing pin retainer
causes the toggle linkage to collapse. This allows the firing pin
retainer to release the firing pin and the firing pin moves
forwards to fire the firearm.
[0010] When the trigger shoe is released and the firing pin is
moved rearwards during reloading of the firearm, the torsion spring
resets the lower toggle, the upper free-floating toggle and the
firing pin retainer to their original positions ready for the next
cycle.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a side detail view of a conventional trigger in
the cocked state as prior art.
[0012] FIG. 2 is a side detail view of a conventional trigger in
the fired state as prior art.
[0013] FIG. 3 is a perspective view of the new invention showing
external parts.
[0014] FIG. 4 is a side detail view of the new invention showing
internal parts.
[0015] FIG. 5 is a side detail view of the new invention showing
pins and screws.
[0016] FIG. 6 is a side detail view of the new invention showing
critical internal parts when in the cocked position.
[0017] FIG. 7 is a side detail view of the new invention showing
critical internal parts at the tipping point.
[0018] FIG. 8 is a side detail view of the new invention showing
critical internal parts in the fired and collapsed Toggle Linkage
state. p FIG. 9 is a side detail view of a modified form of the new
invention showing internal parts in the cocked state with the
torsion spring inverted.
[0019] FIG. 10 is a side detail view of the new invention showing
parts which make up the Toggle Linkage.
DETAILED DESCRIPTION OF THE INVENTION
[0020] With regards to firearms, the invention is able to
facilitate a light trigger pull, prevent premature firing and
importantly, significantly reduce excess complexity in
manufacturing assembly and repair. Throughout this description the
term forward, forwards, front or fore shall refer to the
orientation of the firearm and trigger towards the direction of the
barrel of the firearm. Throughout this description the term
rearward, rearwards, rear or aft shall refer to the orientation of
the firearm and trigger towards the direction of the butt of the
firearm.
[0021] With reference to FIG. 3 the trigger assembly is held to the
firearm either directly, by an adapter, by a hanger or other
necessary device via the Locating Pin Fore 61 and the Locating Pin
Rear 62. The trigger internal parts are captured within an external
chassis being the Left Sheet Chassis 31 and the Right Sheet Chassis
32 which can be made of metal sheet or other suitable material.
Undertravel Screw 33 is located in Left Sheet Chassis and
Overtravel Screw 34 is located in Right Sheet Chassis.
[0022] With reference to FIG. 5 Left Sheet Chassis and Right Sheet
Chassis are both aligned and spaced by screws being Sheet
Connecting Screw A 63, Sheet Connecting Screw B 64, Sheet
Connecting Screw C 65 and Sheet Connecting Screw D 66.
[0023] With reference to FIG. 4 internal parts of the trigger
comprise of Trigger Shoe 44, Lower Toggle 45, Upper Free-Floating
Toggle 46 and Firing Pin Retainer 47. These parts may be made from
steel plate or other suitable material. Additional internal parts
are Torsion Spring Upright 48, Trigger Shoe Adjustment Screw 49,
Firing Pin Retainer Adjustment Screw 50. Trigger Shoe Adjustment
Screw is located in Trigger Shoe, proximate as shown. Firing Pin
Retainer Adjustment Screw is located in Firing Pin Retainer,
proximate as shown. Torsion Spring Upright is centered on Sheet
Connecting Screw A with one arm grounded on Sheet Connecting Screw
B and the other arm acting upon Lower Toggle. Firing Pin Retainer
is held in position by and free to rotate about Locating Pin
Fore.
[0024] With reference to FIG. 10 the combination of Lower Toggle
and Upper Free-Floating Toggle may be alternatively referred to as
the Toggle Linkage.
[0025] With reference to FIG. 5 Lower Toggle is held in position by
and free to rotate about Lower Toggle Screw 67. Trigger Shoe is
held in position by and free to rotate about Trigger Shoe Screw
68.
[0026] With reference to FIG. 6 critical internal parts are shown
with the trigger in a cocked state. In this state the Trigger Shoe
is at rest at its Starting Position D and the Firing Pin 71 is
being prevented from moving forwards to fire the firearm by the
Firing Pin Retainer. Tipping Line C is indicated by a straight
dotted line and is the line between each end of the Toggle Linkage.
In this position the Lower Toggle and the Upper Free-Floating
Toggle are aligned such that they have bias rearwards of the
Tipping Line. Upper Free-Floating Toggle is recessed within and
completely self-constrained between the Firing Pin Retainer and the
Lower Toggle. The downwards force of the Firing Pin acting through
the Firing Pin Retainer, the Upper Free-Floating Toggle and the
Lower Toggle keeps the Upper Free-Floating Toggle and the Lower
Toggle in this rearward bias of the Tipping Line and thus in their
locked position. This alignment is held in place by the Trigger
Shoe Alignment Screw via the Trigger Shoe and acts as a stop to
prevent the Lower Toggle from moving further rearwards. In this
position with rearward bias of the Tipping Line the Lower Toggle
and the Upper Free-Floating Toggle form a rigid structure which
prevents the Firing Pin Retainer from rotating downwards and
releasing the Firing Pin. FIG. 6-8 are now a progression of pulling
the Trigger Shoe.
[0027] With reference to FIG. 7 the Trigger Shoe has been moved
rearwards to position E which is equivalent to a person pulling the
trigger in use. This causes Trigger Shoe Adjustment Screw to move
Lower Toggle and Upper Free-Floating Toggle forwards. The alignment
of Lower Toggle and Upper Free-Floating Toggle is now forwards
beyond the Tipping Line C. At this point there is no more rigidity
in the Lower Toggle and Upper Free-Floating Toggle linkage and thus
the toggle linkage starts to collapse under the downwards force of
the Firing Pin and Firing Pin Retainer.
[0028] Note that the ends of the Upper Free-Floating Toggle are
pointed, nearly pointed or slightly radiused thus reducing bearing
force to minimal levels. Note also that the Torsion Spring Upright
is acting on the Lower Toggle close to the Lower Toggle Screw and
thus has a low leverage force. This means that even though the
Lower Toggle and Upper Free-Floating Toggle linkage was quite rigid
in FIG. 6, the force necessary to move the Lower Toggle and Upper
Free-Floating Toggle linkage beyond the Tipping Line by the Trigger
Shoe and Trigger Shoe Adjusting Screw to the position in FIG. 7 was
very light. In this way the large forces of the Firing Pin are
contained while still maintaining a light trigger pull and
preventing premature firing.
[0029] With reference to FIG. 8 the Lower Toggle and Upper
Free-Floating Toggle linkage has completely collapsed and moved
forwards. The magnitude of this motion is limited by Sheet
Connecting Screw A. The Upper Free-Floating Toggle is still
completely self-constrained between Lower Toggle and Firing Pin
Retainer throughout its entire range of movement. This allows the
Firing Pin Retainer to rotate downwards and release the Firing Pin.
The Firing Pin is then free to move forwards to fire the
firearm.
[0030] With reference to FIG. 8 the trigger is now in a fired
state. In this state the Torsion Spring Upright places a rearwards
force on Lower Toggle. When finger pressure is released from the
Trigger Shoe and the Firing Pin is moved rearwards in the course of
reloading the firearm, the force from Torsion Spring Upright causes
Lower Toggle, Upper Free-Floating Toggle and Firing Pin Retainer to
move back to the cocked position per FIG. 6. The cycle is then
ready to be repeated.
[0031] With reference to FIG. 9 in a modified form the Torsion
Spring Upright may be replaced by Torsion Spring Inverted 81.
Inverting the position of the Torsion Spring results in spring
force being applied closer to the center of the Toggle Linkage and
thus with greater leverage and therefore force. In this
configuration the Torsion Spring Inverted is centered on Sheet
Connecting Screw B and grounded on Sheet Connecting Screw A. As
some shooters require or desire a heavier trigger pull this can be
accomplished in this fashion. By arranging the Torsion Spring in
such a fashion, the simplicity of design and use of only one spring
is maintained.
[0032] Undertravel Screw can be adjusted to set Trigger Shoe in the
correct position while the trigger is on a cocked or ready to fire
condition. This adjustment allows for broader manufacturing
tolerances and for wear.
[0033] Overtravel Screw can be adjusted to limit the travel of
Trigger Shoe too much beyond that necessary for Lower Toggle and
Upper Free-Floating Toggle to go beyond the Tipping Line, that
point at which the Toggle Linkage collapses and the Firing Pin
fires the firearm. This adjustment allows for broader manufacturing
tolerances and for wear.
[0034] Trigger Shoe Adjustment Screw can be adjusted to control the
position of the Lower Toggle and Upper Free-Floating Toggle versus
the Tipping Line. With Trigger Shoe adjusted to the desired
position when the trigger is in the cocked or ready to fire
condition by Undertravel Screw, the Trigger Shoe Adjustment Screw
can then be adjusted forwards until the Tipping Line is exceeded,
Toggle Linkage collapses and the Firing Pin moves forwards. The
Trigger Shoe Adjustment Screw can then be finely adjusted rearwards
to the point where the Toggle Linkage and Firing Pin Retainer just
holds the Firing Pin in the cocked position. The Trigger Shoe
Adjustment Screw may then be screwed further rearwards from this
point to increase the rearwards bias of the Toggle Linkage, enhance
the rigidity of the Toggle Linkage in the cocked position and thus
prevent premature firing. Important is that in this cocked position
the Toggle Linkage rests against the Trigger Shoe Adjustment Screw
which therefore also acts as the rearward mechanical stop for the
Toggle Linkage. Thus, the Trigger Shoe Adjustment Screw acts in
direct mechanical communication between Trigger Shoe and Toggle
Linkage. This mechanical train of Trigger Shoe to Trigger Shoe
Adjustment Screw to Toggle linkage being that which will ultimately
fire the firearm. Thus, being imbedded directly in this train, when
adjusted, Trigger Shoe Adjustment Screw acts directly and without
any intermediary upon and within this train. Being imbedded in this
way, any adjustment made to Trigger Shoe Adjustment Screw, directly
controls both the rearwards bias of the Toggle linkage to control
premature firing whilst also completely avoiding any introduction
of any lost motion of the Trigger Shoe when the trigger is being
used. This ease and singularity of adjustment within the invention
greatly enhances functionality and usability. Furthermore, this
adjustment also allows for broader manufacturing tolerances and
allows for wear.
[0035] Firing Pin Retainer Adjustment Screw can be adjusted for
dimensional variations in Lower Toggle and Upper Free-Floating
Toggle part sizes. In this case the Firing Pin Retainer Adjustment
Screw can be adjusted to remove unnecessary free-play within this
linkage and thus this adjustment also allows for broader
manufacturing tolerances and for wear.
[0036] Note that in this invention all these adjustments are
arranged so that they may be made from underneath the trigger and
thus with the trigger still in situ in the firearm.
[0037] Note that there are no pins located between the Lower
Toggle, Upper Free-Floating Toggle or Firing Pin Retainer. Whereas
pins require precise alignment and therefore tight manufacturing
tolerances of components in two, if not three dimensions to achieve
fit between parts or within mechanical part trains, inventing a
design which has a fully self-constrained Upper Free-Floating
Toggle, free of pins, coupled with the ability to easily adjust the
Toggle Linkage removes the necessity of tight manufacturing
tolerances thus greatly easing production, assembly and repair.
This adds to the novelty of the invention.
[0038] Note that solely using a Lower Toggle and Upper
Free-Floating Toggle to lock the Firing Pin Retainer in place means
that no internal sear is necessary in this invention. This removes
geometric complexity of design, eases manufacturing tolerances and
negates the necessity of hand polishing a sear and its mate to
reduce trigger pull weight negating arduous, intricate and
time-consuming work. This adds to the novelty of the invention.
[0039] Note that the parts of this invention are uniquely designed
such that Side Sheets are able to be profile cut from sheet and
internal parts are able to be profile cut from plate. Coupled with
the aforementioned ability within the invention for inherent
adjustments due to manufacturing variations to be made, profile
cutting such as this versus intricate machining of parts, as is
common in contemporary triggers, greatly simplifies and speeds
manufacturing and this adds to the novelty of the invention.
* * * * *