US1321779A - Stop-arm for hod-elivators - Google Patents

Description

c. w. AN ERSQN. STOP ARM FOR HOD ELEVATORS.

APPLIGA'TION FILED APR, 11. 1917.

1 32 l ,779 Patented Nov. 11, 1919.

vwemtoz UNITED sTArns PATENT OFFICE.- f

CHARLES W. ANDERSON, OF BROOKLYN, NEW YORK.

STOP'ABM FOR HOD-ELEVATORS.

' To all whom it may concern Stop-Arms for Hod-Elevators, of which the following is a specification.

This invention relates to an improvement in stop arms for hod elevators and the like.

An object of the invention is to provide a stop arm which while always ready to perform its function of stopping the movement of the elevator device whenever an obstruction upon the elevator device reaches a predetermined level is of such construction that that portion thereof which is engaged by the obstruction may be readily manually moved so as to permit the obstruction to pass when desired.

A more detailed object is to provide a stop arm pivoted to swing in a plane parallel with the plane of movement of the elevat ing device and including an extension mem ber pivoted to swing in a plane transverse to the plane of movement of the elevating device, so that the extension member, which projects into position to be engaged by the obstruction on the elevating device, will not be moved about its pivotal connection with the main part of the arm when engaged by the obstruction but when it is so engaged will cause the main arm to swing in a plane parallel to the plane of movement of the elevating device and thus operate a suitable automatic stopping mechanism, and so that the extension member may thereafter be swung about its pivotal connection to dispose it out of the path of the obstruction on the elevating device thereby allowing the main arm to return to its normal position and the obstruction to pass.

Other objects and aims of the invention, more or less specific than those referred to above, will be in part obvious and in part pointed out in the course of the following description of the elements, combinations, arrangements of parts and applications of principles, constituting the invention; and the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawings which are to be taken as a part of this specification, and in which I have shown merely a preferred form of embodiment of the invention: i 'ure 1 is a diagrammatic side eleva-;

F tional view showing the general arrange- Specification of Letters Patent.

Application filed April 11, 1917. Serial N0. 161,346.

ment and operation of a hod elevator fitted with a stop arm constructed in accordance with this invention.

Fig. 2 is a top plan view of a stop arm constructed in accordance with this invention and showing the same in operative position in connection with the adjacent elements of the, hod elevator, and

Fig. 3 is a side elevational view of the stop arm shown in Fig. 2.

Referring to the drawings for describing in detail the structure which is illustrated therein, the reference character L indicates the elevator chain. This passes over wheels 1 at its upper and lower ends in a well known manner, said wheels being mounted upon shafts 2. The upper shaft 2 carries a gear 3 which is mounted to be driven from a drive pinion 1 through a train 5 and 6. Rotation of the pinion 4 will cause the forward lead 7 of the chain L to move upwardly so that any obstruction, as 8, upon the lead 7 will be caused to move upwardly, When the obstruction 8 reaches a given position it is desirable that the movement of the chain should automatically cease in order to give the operator 9. chance to remove the obstruction, as for instance when it is a hod or the like, or to remove some article carried by the ObStIllCtlO11,2tS for instance when the obstruction is a platform fixed to the chain to support a bucket or other article (such a platform for instance is illustrated in my copending application, Serial No. 161,345 filed on even date herewith).

Any suitable means may be employed for automatically stopping the movement of the chain. In the instanceillustrated the chain is shown to be driven by a motor G which is connected by a belt 9- with a pulley 10 which is fixed to the shaft 11 upon which the pinion 4 is also fixed. An idler 12 is carried by a swinging arm 13 mounted on shaft 14 and a pull rod 15 is connected to the free end. of the arm 13 for pulling idler 12 into engagement with the belt 9, said idler and associated parts thereof serving as a tightening means for the belt. The belt normally is loose upon the motor pulley and upon the pulley 10 so that unless the idler 12 is in tightening position no motion is transmitted from the motor to the pulley 10. The relation of the shaft 14: to the pulley is such that the arm 13 and the idler 12 normally hang away from the belt.

Adjacent the shaft 14 the arm 13 is formed with ratchet teeth 16, and a pawl 17 is arranged to engage these teeth to hold the idler 12 in tightening position when drawn into said position by the pull rod 15.

The stop arm, as H, of this invention is pivoted to the frame work 18 of the elevator 161,343, filed on even date herewith.

The stop arm H is made up of a main port1on'2O and an extension portion 21.

a The main portion is formed with an enlarged body part 22 for carrying the pivot 23 which is arranged to permit swinging movement of the arm in a vertical plane. Lateral projections 24 and 25 are formed upon the body part, the former being adapted to engage a ledge 26 of the frame work 18 below the pivot to support the arm in normal position, and the latter being adapted to engage the same ledge above the pivot to limit upward movement of the arm.

These two projections, like the body part 22, rest flat upon the surface '27 of the frame work 18 and serve efliciently with the pivot 23 to retain the main portion of the arm aga nst any lateral twisting in operation.

The rod or cable 19 is pivotally connected to the main portion at a point spaced from the p1vot 23, as indicated by the reference numerals 28.

The extension portion 21 of the" arm is pivotally mounted atthe outer end of the main portlon 20, as at the pivot pin 29, arranged to permit swinging movement of the 7 extension in a plane at right angles to the 5.5 -by said spring. Ahandle 32 is formed plane of movement of the main portion, that is in a horizontal plane. A suitable spring 30 engages between the main portion and the extension to constantly urge'the extension into operative position, and a suitable stop, as the foot rule stop 31 is provlded to limit movement of the extension upon the extension by means of which it may be readily manually operated. The free end of the extension projects into the path of the obstruction '8 which is carried by and movable with the chain 7 as above described.

As the obstruction 8 moves upwardly and. engages the extension said engagement causes the main portion of the arm S g upwardly about the pivot 23 and to thereby lift the pawl 17 and stop the movement of the chain as above described. In producing this operation the obstruction moves substantially to the position as indicated at 33 in Fig. 1, that is to a position above the plane in which the extension 21 normally stands. Whenever the operator desires now he presses back the handle 32 so as to release. the extension from the obstruction 8 thus carrying the extension into the position substantially as indicated at 34 in Fig. 1. As soon as the handle is released the spring 30 will cause the extension to swing backwardly. During its backward movement however the force of gravity is exerted to move the extension downwardly at the same time, as suggested by the arrow 35 in Fig. 1, into its original normal position leaving the obstruction above and clear of the extension so that when the belt tightener is again moved into tightening position by a pull'upon the pull rod 15 the chain may move without hindrance until a further obstruction engages the extension.

The handle 32 is preferably in the form of a weight so as to improve the efficiency of the device.

In order to obtain a more eificient operation of the device the obstruction 8 is preferably formed with a concave up )er surface 36 for engaging the stop arm. ikelihood of premature release of the stop arm is thus avoided. The obstruction is also preferably shaped to form an incline at this under surface 38 said surface continuing forwardly and upwardly and providing a sharp edge 39 where it merges into the upper surface 36. Ample bulk and strength may thus be given to the obstruction without likelihood of interfering with the return movement of the stop arm projection.

As many changes could be made in this construction without departing from the scope of the following claims, it is intended that all matter contained in the above description, or shown in the accompanying drawings, shall be interpreted as illustrative only and not in the limiting sense.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. A stop arm for hod elevators, comprising a main portion pivoted to swing in a vertical plane, an extension portion pivoted to the main portion to swing in a horizontal plane, means to resiliently retain the extension portion in a normal position projecting laterally from the main portion, a handle by'means of which to swing the extension portion out of normal position, and said handle being weighted so as to urge the main and extension portions to swing normally downwardly.

2. A stop arm for hod elevators, comprising an arm pivotally mounted upon a substantially horizontal axis and being adapted to swing downwardly about said axis, means to limit the downward swinging of the arm, an extension member pivotally connected to said arm at a point spaced from the pivot of said arm, said extension member being adapted to be engaged by an upwardly moving part of the elevator to be moved for swinging said arm upwardly to control the elevator drive mechanism, and the pivot connecting the extension with said arm being on an axis transverse to the pivotal axis of said arm whereby to prevent swinging oi the extension member about its pivot when struck by the moving part of the elevator, while yet enabling manual swinging of the extension member about its pivot at all times.

3. A stop arm for hod elevators, comprising an arm pivotally mounted upon a substantially horizontal axis and being adapted to swing downwardly about said axis, means to limit the downward swinging of the arm,

an extension member pivotally connected to said arm at a point spaced from the pivot of said arm, said extension member projecting laterally from said arm and having its free endadapted to be engaged by an upwardly moving part of the elevator to be moved for swinging said arm upwardly to control the elevator drive mechanism, and the pivot connecting the extension member with said arm being on an axis transverse to the pivotal axis of said arm whereby to prevent swinging of the extension member about its pivot when struck by the moving part of the elevator, while yet enabling manual swinging of the extension member about its pivot at all times, and said extension member constituting a weight normally retaining the arm in its lower position.

In testimony whereof I afiix my signature in the presence of two Witnesses. v

CHARLES W. ANDERSON. Witnesses:

L. Gnssronn HANDY, GUSTAV GENZLINGER;

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patent:

Washington, D. 0.

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