US1836915A

US1836915A - Nonbreakable hemacytometer

Info

Publication number: US1836915A
Application number: US270010A
Authority: US
Inventors: George Harry William
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-04-14
Filing date: 1928-04-14
Publication date: 1931-12-15
Anticipated expiration: 1948-12-15

Description

H. W. GEORG E Dec. 15, 1931.

NONBREAKABLE HEMACYTOMETER Filed April 14, 1928 myM/Am 1 Patented Dec. 15, 1931 PATENT OFFICE HARRY WILLIAIM GEORGE,

OF KENMORE, NEW YORK NONBREAKABLE nmmacyromnrna Application filed April 14,

This invention relates to improvements in haemacytometers, the general object of the invention being to make the device of nonbreakable material, with means for removably holding the cover plate over the counting chamber so that said plate is attached to the device and cannot fall therefrom and to provide adjustable supports for the plate.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Figure 1 is a plan view showing one form of the invention.

Figure 2 is a section on line 2-2 of Figure 1.

Figure 3 is an edge view showing a modification.

Figure 4 is a section on line ure 3.

Figure 5 is a modification.

Figure 6 is a section on line 66 of Figure 5.

In these views, the numeral 1 indicates the slide or body of the device which is formed of non-breakable material, such as bakelite, and this material may be either transparent or opaque. If opaque material is used, openings, such as shown at 2 in Figure 4, must be provided for permitting light to pass to the scales or rulings.

The usual counting chamber 3 is formed in the central part of the body, with the scale strips 4 formed on the bottom of the chamber. Portions of the side walls of the chamber are undercut to provide the overhanging parts 5 which act as guideways and holding means for the glass cover 6. I also provide supports 7 upon which the cover plate rests, these supports being preferably composed of headed screws 7 having their threaded portions placed in threaded holes partly in section,

44 of Figplan view showing a further 1928. Serial N0. 270,010.

8 formed in the bottom of the chamber, as shown in Figure 3, so that by adjusting these supports, the cover plate will be firmly held between the parts 5 and the heads of the supports so that it will be prevented 55 from falling out. of the chamber when the device is moved about, though said cover can be easily removed when necessary.

Figures 3 and 4 show the scale strip as composed of a strip of glass 4 of dovetail c shape in cross section, held by friction in a dovetail shaped groove 9 formed in the central part of the counting chamber, the material from which the slide or body l is composed acting to frictionally hold the glass strip in place, but permitting it to be removed when necessary.

Figures 5 and 6 show the body 1 with the counting chamber formed on its upper surface, withthe grooves 10 separating the 7 scale strip from the rest of the top surface of the body. These figures also. show clips 11 of metal or the like having portions of their lower parts forming the supports 12 V for the cover glass, these supports being 7 adjustable by bending the material as desired, with the upper portions of the clips bent over to form the guiding and holding means 13 which engage the edges of the cover glass. Of course, a counting'chamber so could be cut in the body 1' and these clips placed therein so that the clips and the cover glass would be below the surface of the slide. V i

' By making the device of non-breakable material, the frequent breakage of devices of this nature, when made of glass, is eliminated and the scales or rulings are more clearly visible when placed on bakelite or similar material than they are when placed onglass. The scales or rulings may be placed on the. strips which form integral parts of the slide or they may be placed on a strip which is removably carriedby the slide. j

The supports 7 are preferably composed of the same material from which the body of the device is formed. g

It is thought from the foregoing description that the advantages and novel features 100 of my invention will be readily apparent.

It is to be understood that I may make changes in the construction and in the combination and arrangement of the several parts, provided that such changes tall within the scope of the appended claims.

WVhat I claim is 1. A haemacytometer slide: having a recess therein containing a counting chamber, said recess opening out through one side of the slide, parts extending inwardly from the upper portions of the side walls of the recess, supports extending upwardly from the bottom of the recess and a cover plate resting on the supports and having its side portions extending under the inwardly extending parts, whereby the cover plate is held in position by said supports and the inwardly extending parts.

2. A haemacytometer slide having a recess therein containing a counting chamber, said recess opening out through one side of the slide, parts extending inwardly from the upper portions of the side walls of the recess, supports extending upwardly from the bottom of the recess, a cover plate resting on the supports and having its side portions extending under the inwardly extending parts, whereby the cover plate is held in position by said supports and the inwardly extending parts and said slide having an opening therein communicating with the bottom of the recess.

3. A haemacytometer slide having a recess therein containing a counting chamber, said recess opening out through one side of the slide, parts extending inwardly from the upper portions of the side walls of the recess, supports extending upwardly from the bottom of the recess, a cover plate resting on the supports'and having its side portions extending under the inwardly extending parts anld means for adjusting the supports vertica 1}.

4:. A haemacytometer slide having a recess therein opening out through the sides of the slide, with the side walls of the recess undercut to form overhanging portions, supports extending upwardly from the bottom of the recess and a cover plate resting on the supports and extendingunder the overhanging portions, whereby the cover plate is held in position by said overhanging parts and the supports.

5. A heemacytometer slide having a recess .therein opening. out through the sides of the slide, with the side walls of the recess undercut to form overhanging portions, adjustable supports extending upwardly from the bottom of the recess and a cover plate resting on the supports and extending under the overhanging portions, whereby the cover plate is held in position by said overhanging parts and the supports.

6. A haemacytometer slide having a recess therein opening out through the sides of the slide, with the side walls of the recess undercut to form overhanging portions, adjustable supports extending upwardly from the bottom of the recess, a cover plate resting on the supports and extending under the overhanging portions, whereby the cover plate is held in position by said overhanging parts and the supports and a removable scale strip in said chamber.

7. A haemacytometer slide having a recess therein opening out through the sides of the slide, with the side walls of the recess undercut to form overhanging portions, adjustable supports extending upwardly from the bottom of the recess, a cover plate resting on the supports and extending under the overhanging portions, a removable scale strip in said chamber and said slide having light openings therein communicating with the chamber.

In testimony whereof I aflix my signature.

HARRY WILLIAM GEORGE.

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