Wrench Page: 3 of 3
This patent is part of the collection entitled: Texas Patents and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
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1,216,308
shank 21 thereof. Pivotally supporting the
lever is a pin 28 extending through the sides
of the jaw.
In view of the above description, it is
5 thought that the operation of my improved
wrench will be readily understood. The
wrench may be grasped in.one hand of the
operator and by pressing downwardlyupon
the head 27 of the releasing button or lever
10 26, the shank of the said lever will be caused
to lift the free extremity of the shank 21
against the tension of the spring 26 so that
the pawl. will rock upon its pivot to move
the teeth 20 thereof out of engagement with
15 the teeth 11 of the rack. The movable jaw
may then be adjusted away from the fixed
jaw and it will be noted that this operation
may be easily accomplished without the use
of both hands of the operator. Thus, the
20 wrench may be easily and quickly manipu-
lated. Upon the release of the lever 26. the
spring 22 will again urge the pawl to en-
gage the shank 10 to hold the movable jaw
fixed.
25 The purpose in freely mounting the pawl
1S upon its pivot pin 24 will now become
apparent. - It will be seen that when the
pawl is in engagement with the shank'10,
the head of the pawl will occupy a position
30 oblique to the longitudinal axis of the shank
with the major length of the head disposed
below the plane of the said pivot pin. Con-.
sequently, when stress is exerted upon the
movable jaw tending to shift the said jaw
35 downwardly upon the shank away from the
fixed jaw, the .head of the pawl will act as
a cam between the movable jaw and the
shank and will bind between the shank and
the seat 17 with the convex face of the re-
40 duced portion 19 of the head of the pawl
engaging within the said seat. It will there-
fore be clear that the greater the downward
stress upon the movable jaw, the more se-
curely will the pawl be moved to bind be-
45 tween the shank and the niovable jaw to
lock the said jaw in fixed position upon the
shank. In this connection, it will be ob-
served that the seat 17 is formed in a solid
portion of. the body of the wrench so that
50 the cam action of the pawl will be exerted
against the thickened portion of -the wrench
body and the said seat will therefore pro-
vide a rigid abutment for the pawl.
It will now be observed that the head 27
55 of the lever 26 is received within a suitable
notch 29 formed in the outer lower corner
of the movable jaw and the forward edge of
the said jaw is provided with a thickened
portion or shoulder. 30 adjacent the said
o notch, the shoulder projecting laterally and
outwardly from the plane of the head 27 of
the lever. : The head of the lever is thusmounted entirely within the lines of the
body of the movable jaw so th at obJtp
cannot easily strike thereagain1 t to opero''' 63
the said lefer and release the pawl 1 1 ml
the shoulder 30 will, ot course. tend to pr"
vent a similar result. To limit the movement
of the jaw 14 away from. the fixed jaw of
tfe wrench, the shank 10 is provided with a 70
pin 31 adjacent. the outer ext remity thereof.
In Fig. 4 of the drawings, I have disclosed
a slight modification in the eonstr action of
operating lever or button for the pawi. In
this modification, the operating lever in- 75
eludes a headed button designated 3 and a
rock arm 33 pivotally suppdrted within the
recess 15 of the movable. jaw by a pim 1.
The button 32 is provid)ve with a shank
which extends within the said recess and is 30
pivotally connected to one encl of the said
rock' arm while the opposite end of the rock
arm is engaged beneath the free end of the
shank 21 o the pawl 1i.S By depressin the
button 32, the rock a r-n will be moved to 85
lift the pawl out of engagement with the
shank 10. Since the construction of this
modified form is otherwise in accordance
with the preferred construction of the in-
vention, a. further description thereof is ob- 0
yiously unnecessary.
Having thus described my invention. what
I claim and desire to secure by Letters Pat-
ent is:I
1. A wrench including a shank provided 95
with a fixed jaw. a movable jaw adjustable
upon the shank to coact with the fixed jaw.
the movable jaw being formed with .a con-
cave seat, and a pawl loosely pivoted to the
movable jaw and provided with a head hay- 100
ing a convex portion confronting said sent.
the head of the pawl being movable to en-
gage the shank in a plane upon one side of
said pivot whereby pressure upon the mov-
able jaw tending to urge it away from the 105
fixed jaw will act to rock the pawl upon its
pivot to a position with the pawl wedged
between the shankand the movable jaw with
the head of the pawl engaging the shank
and with the convex portion thereof abut- 1.10
ting said seat.
2. A wrench including a shank having a
fixed jaw, a movable jaw adjustable upon
the shank, and a. pawl having a head. loosely
pivoted to the movable jaw and movable to 11,5
engage the said shank for holding the inov-
able jaw at adjustment with the head of the
pawl wedged between the shank andi the
movable jaw and engaging at its respeeti e
extremities therewith. 1.20
In testimony whereof, I affix my signa-
ture.JAMES W. HAMLETT. [L. s.t
2
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Hamlett, James W. Wrench, patent, February 20, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth858926/m1/3/?q=%22~1%22~1: accessed July 12, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.