US1239418A - Sash-weight. - Google Patents

Description

C. L. MARTIN.

SASH WEIGHT. APPLICATION FILED FEB-28. 1911.

Patented Sept. 4, 191?.

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"UNITED @TATEd PATENT @FFTQE.

CHARLES L. MARTIIFT, 0]? LOS ANGELES, CALIFORNIA, ASSIGNOR OF ONE-HALF TO CHARLES N. HOWARD, OF LOS ANGELES, CALIFORNIA.

SASH-WEIGHT.

Y Specification 6f Letters Patent.

Patented Sept. 4:, 1917.

Application filed February 28, 1917. Serial No. 151,468.

,To all whom it may concern:

Be it known that 1, CHARLES L. MARTIN, a citizen'of the United States, residing at Los Angeles, inthe county of Los Angeles and State of California, have invented a new and useful Sash-Weight, of which the following is a specification.

This invention relates to counterbalance weights for window sashes and the like and an object of the invention is to minimize the cost of production'of sash weights.

In the construction of windows the cross sectional area of the easement chamber for the sash weights is generally made as small as possible and -it has been the practice generally to make the sash weights of much smaller cross sectional area than the chamber so that the weights can be readily attached to the sash cords outside of the chambers and then swung into said chambers. Thus the weightsare generally relatively long and of small diameter and it is readily comprehended that, the length of the weights depending upon the weight of the ,window sashes to be balanced,- trouble may arise from the weights striking the ends of the chamber when the sashes are raised and lowered. i

Cement or concrete being a great deal less expensive than iron has been proposed. to be used in place of iron weights, but, inasmuch as cement or concrete weights are much lighter per unit volume than iron it is obvious that the tendency is for the weights made of concrete to be entirely too long for the ordinary window construction. This is due not entirely to the length of the weight blo'ck itself but partly to the fact that the sheave for the sash cord is frequently attached to the upper end of the weight and therefore occupies considerable space above the weight.

An object of this invention is to produce a sash wei ht which will occu minimum which will manimize the ease with which the Weight may be attached to the sash cord,

even when the weight is in its casement chamber. Thus withdrawal of the weight from the chamber for attaching and detaching it is not necessary and consequently the cross sectional area of said weight may be made almost as great as the cross sectional area of the easement chamber itself.

Another object is to make provisiolrfor securely connecting the sheave to the body of the weight block.

It will be readily understood, that though some features of the invention are especially applicable when concrete or cementitious material is employed in the construction of the weight, other features are of advantage if iron be employed in place of the cementitious material.

Other objects and advantages will appear in the .subjoined detail description.

The accompanying drawings illustrate the invention:

Figure 1 is a perspective view of an im-, proved sash weight embodying the invention;

Fig. 2 is a side elevation of the sheave case, sheave and reinforcement member, the weight block being fragmentarily indicated in dotted lines and portions of the reinforcement member being broken away to contract the View.

Fig. 3 is a plan section on line indicated by a2 -m Fig. 2, the weight block also being shown in cross section.

The weight block is shown at 1 and is preferably retangular in form and is provided'at its upper end with a recess 2 in which is rotatively mounted a sheave or pulley 3 by which the weight is suspended from the sash cord, not shown. The walls of the recess 2 may be formed by a lining or sheave case as in Fig. 2. The bottom wall of the case 4 in Fig. 2 forms a curved track or guide a as shown to conform with the curvature of the sheave 3 and the bottom wall is spaced from the sheave 3 sufficiently to permit the sash cord to pass between th sheave and the bottom of the recess.

The material of which the block 1 is constructed may be allowed while in a fluid or semi-fluid state to How through the hollow shaft'5 of the sheave to form a core 6 as clearly shown in Fig. 3. The sheave 3 in Fig. 3 is journalcd on the hollow shaft 5 and it is clear that the hollow shaft 5 is strengthened by the core 6 and is very securely anchored in place by said core.

Other anchoring means maybe provided especially if the weight block is constructed of concrete or cementitious material and for against upward movement.

The sheave case 4 may be provided with a flange 10 which in Fig. 2 is embedded in the block 1 so that its outer face is flush with the upper end of said block.

The lower end of the block 1 may be provided with a notch or groove 11 extending transversely to the U-shaped portion 8 of the reinforcement rod, the top of the groove being above the level of the lower portion of the U-shaped member so that a portion 12 of the U-shaped member will extend through the groove 11 transversely thereof in order that a book, not shown, of a supplemental weight block, not shown, may be hooked over the portion 12 to increase the weight for balancing the sash or sashes with which the block 1 is to be connected.

In practice the weight block 1 will be in serted in the chamber adapted to contain it and one end of the sash cord, not shown,

previously fastened to one sash will be forced throu h the race between the sheave 3 and case a and said end will be fastened to the other window sash inthe usual man ner so that the block 1 will be suspended and will act as a counterbalance to the window sash, or window sashes in case two sashes are connected to the one weight as is often the case.

From the foregoing it is clear that the sash cord may be readily threaded around the sheave 3 and that practically the entire space above the block 1 is free from anything that would interfere with the block being drawn close to the pulley in the window frame as is readily understood, this being due to the fact that the sheave 3 is mounted in the recess 2. An important feature of this invention is the curvedguidc or track a for facilitating the threading of the sash cord to "he weight, and it is obvious that either iron or cementitious material could be employed for the construction of the block 1. It is of course preferable, be-

cause of less cost, to employ the cementitious material, butin the case of extraordinarily large windows it may be advisable at times to employ iron or other metal in the manufacture of the block 1.

In the manufacture of the improved sash weight, shown in Figs. 2 and 3, the sheave 3 and the parts for mounting said sheave will be placed in a suitable mold, not shown, and the material of which the block is'to be formed will then be poured or placed in the mold so that the sheave will be cast in place as is readily understood.

From the foregoing it is clear that I have provided a recess with a semicircular track and that a sheave is journaled in the recess and spaced from the semicircular track so that when the end of a sash cord is pushed into the recess along the curved track it will readily pass along the periphery of the sheave, first downward then beneath and finally upward so that said end may be readily grasped by the workman as said end issues from the recess. It is readily seen that the sheave 3 and its case 4 can be inserted in the recess 2 through the mouth of said recess because said mouth is unobstructed.

1 claim: V

1. A sash weight comprising a concrete block having a recess in one end, a reinforcement rod embedded in said block, and

a sheave in the recess anchored to said re-' inforcement rod.

2. A sash weight comprising a concrete block having a recess in one end, a sheave case in said recess, a sheave rotatively mounted in said sheave case, said sheave case being curved to conform peripherally with the sheave, and a reinforcement rod embedded in the block and connected with said sheave case.

3. A sash weight comprising a sheave casehaving a hollowshaft, a sheave journaled on said shaft, and a block embracing the sides of said sheave case and forming a core inside of said hollow shaft to anchor the CHARLES L. -MARTIN.

Witnesses:

GEORGE H. HILES, A. F. SCHMIDTBAUER.

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