Year: 1894

page_text: Date of Application, 23rd Nov., 1894-Accepted, 2nd Nov., 1895
Figure 2 is a side elevation thereof.
Figure 3 shows a front and side elevation of the jamming piece b.
Figure 4 is a plan as seen from below and a front elevation of the jamming
piece c.
Figures 5 and 6 show the device applied to a brake gear adapted to be operated
by the axle of the vehicle.
The jamming pieces b and c as shown in Figures 1, 2, 3 and 4 are arranged at an
angle of less than 90° with the bolt a in a casing of metal or wood of any suitable
form. The movements of these jamming pieces are limited each by two pins eg
and il respectively, fixed to the casing. Each of the jamming pieces is pressed by
a spring and d from the right to the left and is provided with a recess to form a
hook and c respectively, cut from the material. A forked lever m pivotted
If the
at m' is placed so as to come in contact with the two jamming pieces.
upper end of the lever m is moved in the direction of the arrow, the jamming
pieces and c are moved to the right against the pressure of the springs hand d.
In this position i.e. when the pieces b and c have been placed in an oblique position
by the operation of the lever, the hooks of the pieces drop, so that the bolt a can
be easily moved to and fio between the wedges. When the lever m is set free, the
springs d and return the pieces b and c into their former positions and the oblique
faces of the hooks b¹ c¹ grip the bolt a and prevent the movement of the latter.
The greater the force applied to pull out the bolt a, the larger will be the
frictional resistance of the hooks b' and therefore also the braking action of the
former. The bolt a can only be pulled to the left and the locking device opened
when the lever m by means of its lower forked parts, has pushed the pieces band c
so far to the right, that the oblique faces of the books b are parallel with the
sides of the bolt a. The bolt a may be inserted between the two jamming pieces b
and c without the help of the lever m, because the pointed end of the bolt a pushes
the pieces to the right until the bolt is fixed between them.
It is evident that this device may also be used for brakes.
It will be understood that the construction shown in Figures 5 and 6 in which
the brake is adapted to be operated by the axle is only an example of the
application of this wedge fastener, and that the same may be modified and the
device applied in any suitable manner.
In this case the rod a is held in bearing blocks b so as to be movable in axial
direction and is pressed forwards in the direction of the arrow y by a spring c
which lays itself against a bearing b on the one side and against a collar d on the

page_text: other side. Two of the before mentioned bearing blocks carry a ode on which
rest the two jamming pieces f and g. These pieces have on one end an oblique
hole and h¹ respectively, through which is led the rod a to be operated. If a
force is exerted on the other end of these levers. parallel to the rod a, the holek,
and respectively, will be placed obliquely and the levers will be gripped on the
rod so as to form an immovable whole with the latter.
On the rod e is situated a spiral spring which presses the jamming piece
forwards in the direction of the arrow y against a projection k, so that the hole h
is placed parallel to the rod a and the latter is freely movable. A second spring
presses the jamming piece g against a projection m and the thumb piece n of a dis-
engaging lever o. The hole in the jamming piece g is arranged so that the rod a
can only be moved in a direction opposite to that of the arrow y when the jamming
device is under the influence of the spring 1, otherwise it is held fixed by the
jamming piece g. A draw bar P is connected with lever o by which the jamming
piece 9 can be moved so that the hole is placed in the direction of the rod a
and the latter is therefore set free.
An eccentrics is movable on the axle g by means of the clutch and is driven
through a feather by the axle q. The clutch is situated on a forked lever,
pivotted at r, which can be moved about an axis by the draw bar v from the
handle u, whereby the clutch r receives a side motion and thus moves the eccentric
on the axle.
The movement of the rod a is transferred by a lever system w to the brake
blocks in such a manner that the latter are free when the rod a is pressed
forwards in the direction of the arrow y and press against the wheel when the rod a.
is moved in the opposite direction.
The action of the friction device is as follows:-If the various parts are in
the position as shown, then the brake is loosened. If the travelling vehicle is
to be braked, the eccentric is moved, from the position shown in Figure 2, to the
left by a pull on the handle u so that during rotation it presses on the jamming
piece in a backward direction whereby the rod a is drawn back and is held in
this position by the second jamming piece, while the former, f, is returned into its
initial position by the spring i in order to be moved back again by the eccentric,
in which movement the bar a is forced to join. This is repeated until the brake
is locked and the vehicle is at rest. The braking effect may be regulated in a
simple manner, by allowing the eccentric to act upon the rod a a greater or less
number of times.
The loosening of the brake is effected by moving the rod p whereby the
projecting piece n presses back the upper end of y and sets free the rod a, so that
the same may be pushed forwards by the spring c and loosen the brake blocks .
It will be easily seen that only little force is required either for the locking or
loosening of the brake.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1st. A locking device or grip fastener consisting of one or more jamming pieces b
and having recesses and c¹ respectively and a smooth bolt a adapted to be
inserted within the hooked recesses of the jamming piece and disposed so as to
make an angle of less than 90° with the jamming piece or pieces so that the
movement of the bolt is only possible in one direction owing to recesses b and c in
the said wedges, substantially as described.
2nd. The locking device claimed in Claim 1 oue applied to brakes.
Datad this 23rd day of November 1904
FELL & WILDING,
Agents for the Applicants.