US1103839A - Raising and lowering mechanism. - Google Patents

Description

APPLICATION FILED NOV. 18, 1918.

Patented July 14, 1914.

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GEORGE nnELLAY, or eurnronn, comvnc'rxcun.

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Specification of Letters Patent. Application filed November 18, 1913. Serial no. 801,684

Patented any 14,

-is represented in-the accompanying draw- A practical embodiment of the invention ings, in which, A

Figure 1 is a front elevation. partly in section. Fig. 2 is an enlarged vertical section showing the parts in the position which they assume when the-standard is locked. Fig. 3 is a similar view showing the parts in the position .which they assume when the standard is free to be raised and lowered.

Fig. 4 is a transverse section in the plane of the line A-A of Fig. 2. Fig. 5 is a transverse section in the plane of the line BB of Fig. 3, and Fig. 6 is an enlarged view in detail taken in a plane at right angles to Figs. 2 and '3, to show the action of the stop in limiting the upward movement of the standard.

A base, represented by 1, may be of any suitable form, the present instance hav 4 ing a central hub and legs radiating there from, for receiving the casters as is usual.

In the hub of the base 1, there is fixed an upright tube 2 of suflicient height to form a guide for the vertically movable standard. The body of the vertically movable standard, denoted by 3, is of tubular form and constructed to surround and slide up and down along the tube 2. At the upper end of the body 3, there is fixed a head piece 4, from which a screw-threaded stem 5 extends upthe washer 8 in contact With the interior wall of the tubular body '3 of the vertically movable standard. I j

The wall of the tube 2 is'p-rovided with diametrically opposed slots 11' and, 12, the

former being a closed slot and the latter open to the upper end of thetube 2. Seated in the slot 11 and projecting through the slot in the direction of the axis of the tube .2, there is a jaw 13, the inner face l l of.

.face 14, the narrow end of the jaw 15 being directed downwardly. The inner face of the jaw 15 has retaining shoulders, in the present instance two, denotedrespectively by 17 and 18, for retaining rollers 19,20 between the inclined faces of the two jaws. The structure of the two jaws 13,15,is such that whenthejaw 15 is slid'upwardly along the face of the jaw 13,. it will release the outer faces of. the jaws 13, 15, from the interior Wall of the standard 3, to such an extent as to permit the standard. 3 to move freely up and down on the tube 2, but whvn the jaw 15 is lowered, rolling along the face of, the jaw .13, the outer faces of the two jaws will be crowded against the inner wall of the standard 3, locking it against movement either up or down.

The jaw 15 is operated by means of a rod 21 attached to its lower end and extending downwardly within the tube 2, through an opening 22 in. a plug 23, fixed in the lower endof the tube 2, and through the hub of the base 1, into engagement with the inner end 24 of a pedal 25, suitably fulcrumed as at 26, on the base 1, with its outer end in position to be acted upon by the foot of the operator. A spring 27 interposed between the plug 23 at the lower'end of the tube 2, and the end 24 of thepedal and having its lower end attached to the lower end ofthe rod 21,serves to keep the rod 21 in its lowered position when the pedal 25 is not acted upon by the foot of the operator. I,

To look the standard against removal from the support 2, when the jaws 13, 15

are released and to positively limit the extreme upward movement of the standard, the'lower end of the standard?) is given a slight outward turn, as shown at 28, and seated in a recess 29 in the upper face of a collar 30 surrounding and free to slide up and down along the support. A collar 31 surrounds the standard 3, andits lower edge projects over the outer. wall of the recess 29, sufliciently to lock the parts 30 and 31 to the lower end of the standard 3, when the part 31 is secured. to the part 30. The parts 30 and 31 are conveniently secured together by means of screws 32, 33, as clearly shown in Figs. 1, 4 and 5. The part 30, by fitting'the support 2 with an easy fit, also serves to guide the lower end of the standard 3 along the support 2, and in this respect coacts with the washer 8 so that the movement up and down of the standard 3 will be free from any tendency to wabble. At the point where it is desired to limit the upward movement of the standard 3, the tube 2 is provided with two diametrically opposite perforations, one being shown at 34,Figs. 2, 3 and 6, through which the outwardly turned ends of a U-shaped piece of spring wire project sufliciently to engage the inner portion of the collar 30, as the latter slides up the sup; port 2. This engagement is clearly shown in Fig. 6, where the outwardly turned end 35 of the U-shaped stop is engaged with the Y upper portion of the inner rim of the collar 30. It is to be understood that the U-shaped stop has its opposite outwardly turned end projected through the wall of the support 2, in a manner quite similar to that shown in Fig. 6. v

In assembling the parts, the supporting tube 2 may first be fixed in the base 1, the

U-shaped stop with its projecting ends 35 may then be passed down within the tube 2,

by springing the ends 35 inwardly until these .ends reach the perforations 34, when they will be free to spring outwardly into the position shown in Fig. 6. The collar 30 may then be slipped over the tube 2. The

jaw 13 may then be placed in position, andby throwing the tube 2 to one side and tilting it so as to place the inclined face of the jaw 15 in a substantially level position, the latter may be slid along into the tube 2, with its rollers on its face, until it reaches a position opposite the inclined face of the jaw 13, when the rollers will be held in position. At the same time, the rod 21 attached to the jaw 15, is slid through the opening 22 and through the hub of the base. The end piece 6 may then be secured in the top of the tube 2. The tubular portion 3 of the vertically movable standard may then be slid into position with its collar '31 thereon, and the latter may be secured to the collar 30 to lock the two;collars 80, 31, to the lower end of the standard. The washer 8 may then besecured to the base 6, by operating the screw 10, through the open upper end of the tubular portion of the standard,

- the standard from any and the head piece 4 with its stem 5, may

then be attached to the upper end of the part 3, to hold the assembly.

In operation, when itis desired to elevate the standard, the foot of the operator depresses the-outer end of the pedal 25, thereby lifting the rod 21 against the tension of the spring 27, and sliding the jaw 15 upwardly along the jaw 13, thereby releasing the jaws from the inner wall of the standard and permitting the latter to be lifted by the foot of the operator to such a height as may be desired within the'limits of the movement of the standard, and the foot of the operator being thus released from the pedal, the spring 27 acts to promptly move the jaw 15 along the face of the jaw 13,

that the release by the upward movement of the jaw 15 will not be suflicient to open the raceway in which the rollers 19, 20, operate,

sufliciently to allow the latter to escape, but

will at the same time permit the jaws 'to approach each other sufiiciently to relieve considerable friction. v The device is found to be eminently practicable in practice, it is a simple one to construct and the parts are so housed that they are .not liable to become clogged with foreign matter or. to suffer injury or displacement from outside sources.

What I claim is:

1. A raising and lowering mechanism comprising a tubular standard, a tubular support within the standard, clamping jaws 'n the tubular support and projecting through the wall thereof, means for manipulating them, and a guide fixed to the upper end of the tubular support and adapted to close the interior of the tubular standard, forming an air cushion.

2. A raising and lowering mechanism comprising a tubular standard, a tubular support within the standard, clamping jaws in the tubular support and projecting through the wall thereof, means for manipulating the jaws, a guide fixed to the upper end of the tubular support and adapted to close-the interior of the standard, and a guide fixed to the lower end of the standard adapted to engage the exterior of the tubular. support.

3. A raising and lowering mechanism comprising a tubular standard, a tubular support within the standard, clamping jaws in the tubular support and projecting through its wall, means for manipulating the jaws, a guide fixed to the lower end of the standard and adapted to vengage and slide along the exterior of the tubular stand ard and a stop projecting thro';'*h the wall of the tubular standard in p0. .ion to engage the said guide and limit the upward movement of the standard, I

4:. A raising and lowering meehanlsm comprising a tubular standard, a tubular support for the standard means within the tubular support and pro ect1ng through its wall for locking the standard in difierent vertical adjustments and a U-shaped stop within the tubular-support having its opposite ends projecting through the wall of the sup portin position to engage the standard and limit its movement.

in testimony that I claim the. foregoing as my invention I have signed my name in presence of two witnesses, this thirteenth day of November, 1913.

GEORGE E. RELLAY.

Witnesses:

F. C. SPENCER, S. S. SHELLEY.

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