US1224263A - Adjusting means for the backs of type-writer chairs. - Google Patents

Description

Patented May 1, 1917.

H. W. BOLENS.

ADJUSTING MEANS FOR THE BACKS OF TYPE WRITER CHAIRS.

APPLICATION FILED SEPT-2|. 1915.

[3/ INVENTOR:

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HARRY W. BOLENS, 0F PORT WASHINGTON, WISCONSIN.

Specification of Letters Patent.

Patented May 1, 1917.

Application filed September 21, 1915. Serial No. 51,784.

To all whom it may concern Be it known that I, HARRY BOLENS, a citizen of the United States, residing at Port )Vashington, in the county of Ozaukee and State of Wisconsin, have invented a new and useful Adjusting Means for the Backs of Type-Writer Chairs, of which the following is a specification.

My invention relates to improvements in the adjusting means for the backs of typewriter chairs.

The conventional type-writer chair embodies some well-known style of what is commonly termed iron and which includes the threaded standard or post arranged adjustably in the base of the chair. the usual yoke, and the spring-tension device. In this form of iron there is further embodied what is commonly termed a rockerarm, the same being merely a rigid rearwardly extending extension of the iron and to which the lower end of the chair-back standard is pivoted in some adjustable manner and maintained in its adjusted or tilted position to suit the convenience and ease of the user by means of a hand operated clamping bolt, the lower end of the chair-back standard being bifurcated at its lower end to embrace the usually widened end of the rocker-arm.

Experience proves the fact that this means is not altogether successful in looking or retaining the chair-back standard in its adjusted positions, and that when adjusted to suit the convenience of the user and apparently tightened with the usual degree of firmness, it gradually slips and gets out of adjustment.

My invention has for its principal object to obviate this defect in this class of chairconstructions, and, yet at the same time, utilize this well-known and generally approved type of chair-adjustment.

My invention, may, therefore, be said to consist in means which when clamped to secure the chair-back standard to the rockerarm are positive and capable of preventing the slipping of these parts, all as herein pointed out, the preferred particular means employed being hereinafter set forth in detail.

Referring to the drawing:

Figure 1 is a side-elevation and partial sectional view (parts being broken away) of the conventional type of type-Writer chairadjustment hereinbefore mentioned and provided with my improvements;

Fig. 2 is a transverse sectional-view of Fig. 1 through the chair-back standard and rocker-arm, and

Fig. 3 is a vertical longitudinal sectionalview of the same.

Similar numerals of reference indicate similar parts in all the figures of the drawing. 4

Specifically referring to the conventional type of type-writer chair iron, the same consists of the usual threaded adjusting-post or standard 1, which, as will be understood, is adj ustably mounted in a suitable design of base (not necessary to be herein shown, and, hence, omitted). Upon the upper end of the adj Listing-post or standard is mounted any well-known form of adjustment, but embodying the rearwardly extending rockerarm 2. lhis rocker-arm, it will be understood, projects a short distance in rear of the chair-seat (also not herein shown), and terminates in a widened and flattened portion, which for convenience, I will term a head 3. The back, aside from its usual appurtenances, includes the standard l, and it has been the habit to bifurcate or recess the lower end of the same so as to form bifurcations that are parallel and adapted to embrace the head 3 of the rocker-arm. The head of the rocker-arm has its upper edge provided with a transverse notch 5, and a fulcrum-pin 6 rests therein and passes through the bifurcations of the back-standard, whereby, as will be obvious, the backstandard is capable of pivotal movement back and forth. Near its lower end and concentric with the fulcrum-pin 6, the head 3 of the rocker-arm is provided with a short curved or segmental slot 7, and coincident with the same the bifurcations of the backstandards are provided with transversely alining bolt-holes 8, through which and the aforesaid curved or segmental slot is passed the adjusting or clamping bolt 9, headed at one end and at its other carrying a nut 10, in the form of a small hand-wheel.

Thus far, I have described merely the well-known or conventional type of typewriter chair adjustment, and, as heretofore pointed out, the clamping-means described are inefficient to accomplish the end in view.

To make these means efficient for the purpose intended, first of all, I provide the opposite vertical faces of the head 3 of the rocker-arm with a series of vertically disposed serrations or flutes, or grooves, as they may be better termed, perhaps, all as indicated at 11. These grooves may be more or less in number, different in character or design, as well as disposition, the object being to provide a somewhat roughened surface against which the bifurcations of the wooden back-standard may be clamped by the bolt in contradistinction to the smooth surface usually employed, and whereby, when thus clamped, the fiber of'the wood of which the back-standard is composed is, with the same amount of pressure usually employed, caused to interlock with the grooves or roughened surface aforesaid, so that the slipping tendency of these parts is to a very great extent, overcome and done away with.

While this may, to a certain extent, accomplish the object sought, yet I prefer to increase the certainty of doing so in yet an other manner, namely: by gradually tapering the head 3 of the rocker-arm clownwardly. That is to say, by gradually reducing the head 3 in Width from its upper toward its lower end, whereby to increase the pinching efiect of the bifurcations of the back-standard, which bifurcations, it will be understood, are normally parallel. In addition to this, I also gradually taper the head 3 from its front toward its rear edge, where by, the greater the weight exerted rearwardly against the chair-back, the more firmly will the bifurcations be forced into clamping position with the head- 3 because in such event the tendency of the lower end of the back-standard will be to move for- Ward and this tendency will be opposed b the opposite inclined surfaces of the head 3.

In the manner indicated, it will be obvione that I have converted the rather insecure and unsatisfactory clamping-means of the present type of chair into a most secure and eflicient clamping means. It will be understood, of course, that the several means I have suggested all cooperate to produce an adjustment that cannot possibly slip when once adjusted, and it is my intention at the present to combine such means in the operative device. At the same time, I also con template using any one of the means described or combining any two, as I may prefer.

Having described my invention, what I claim, is:

1. The combination in a chair-iron, com

prising a rearwardly disposed rocker-arm terminating in a flattened head, the latter furcations, and a wheel-nut' on the end of the bolt whereby the bifurcations may be drawn together to conform to and clamp the opposite inclined surfaces of the head.

2. The combination, in a chair-iron, comprising a rearwardly disposed rocker-arm terminating in a flattened head, the latter having its opposite surfaces grooved or serrated, notched at its upper end and slotted near its lower end concentrically with the notch, and, further, tapered from its front toward its rear edge and from its upper toward its bottom edge, to form vertical and transverse oppositely inclined surfaces, a baclestandard recessed to substantially agree with the widest or upper edge of the head and to form opposite parallel bifurcations adapted to embrace the same, a fulcrum-pintle passed through the bifurcations and resting in the notch of the head, a bolt passed through the bifurcations and through the segmental slot of the head, and a nut threaded on the bolt at one side of the standard, whereby the bifurcations may be drawn together to conform to and clamp the opposite inclined surfaces of the head.

3. The combination, in a chair-iron, comprising a rearwardly disposed rocker-arm terminating in a flattened widened head having at one side a vertically and a horizontally inclined surface, at its upper end a notch and near its lower end a curved slot concentric with the notch, a back-standard pivoted in said notch and extending below its pivot to bear against said surface of th head, a clamping-bolt extending through the slot and the baclestandard, and a bindingnut threaded on the bolt and adapted to draw the standard snugly and clamp the standard against said inclined surfaces.

In testimony whereof I have signed my name to this specification in the presence o two subscribing witnesses.

HARRY W. BOLENS Witnesses:

E. ELLIS, W. S. DUVALL.

Copies of this patent may be obtained for five cents each, by addressing; the Commissioner of Patents. Washington, D. G.

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