US352639A

US352639A - Microscope

Info

Publication number: US352639A
Authority: US
Publication date: 1886-11-16
Anticipated expiration: 1903-11-16

Description

2 Sheets Sheet 1.

(No Model.)

' B.F.ALLEN.

MICROSCOPE.

Patented Nov. 16,-1886Q N PETERS. Pllulo'lrlhugmphcr. Washington. D c

mel.

I 2 Sheets-Sheet 2. B. P. ALLEN.

. MIGROSGOPB- .No. 352,639. Patented Nov. 16. 1886.

' N PETERS. Pmw-mm mm. wanum D c ihvrrn- STATES ATENT MICROSCOPE.

SPECIFICATION forming part of Letters Patent No. 352,639, dated November 16, 1886.

Application filed March 8, 1886.

To all whom it may concern:

Be it known that I; BENJAMIN F. ALLEN, of Plainfield, in the county of Union and State of New Jersey, have invented an Improvement in Microscop'es,of which the following is a specification.

This improvement is made for allowing the microscope to be packed into a small compass, and for facilitating the adjustment of the instrument at an inclination when opened out for use, and for adjusting the position of the mirror or reflector in a simple and efficient manner, and for adjusting the focus with delicacy and precision without interfering with the action of the more rapid end movement that can be given to the lens-tube.

In the drawings, Figure 1 is an elevation of the instrument in positionfor use. Fig. 2 is a cross-section through the pivotal bearing. Fig. 3 isa cross-section of the slide and thelensholder at the line as w, Fig. 1. Fig. 4 represents the under side of the lens-tube and the micrometric adjusting device, with the lugs of the base-piece in section. Fig. 5 is a plan of the base-piece to the lenstubc. Fig. 6 is an elevation of the front of the lens-tube. Fig. 7 is an inverted plan of the object-table slide with its supportingarm in section; Fig. 8 is a sectional plan at the line y c, Fig. 1, and Fig. 9 is an elevation of the mirror-holder Without the mirror, the base being in section at. the line y of Fig. 1.

The lens tube 1 is of any desired size or character, and within it are the lenses that may be adjustable, and the lens-tube may be extensible, as my improvement is available with any kind of lens-tube or lenses. Upon this lens-tube is a basebar, 2. 3 is the rackbar, sliding in thejaws4 upon the arm. 5 and 6 are thumbwvheels'for turning the pinion 47, that acts upon the rack-bar 3.

The rack bar 3 is made separate from the base-bar 2, in order that the micrometrio adjustment may be applied between the rackbar 3 and the base-bar 2, and the rapid and more coarse adjustment by the thumb-wheels and rack-bar may be retained and operated with facility, and afterward the more delicate adjustment to focus, the object may be effected by moving the base-bar 2 upon the rack-bar 3. To effect this object,I' connect the rack-bar Serial No. 194,390. (No model.)

the rack-bar passing into undercut grooves in the base-bar 2, and there is a spring, 8, that acts against one of the dovetailed lugs 7, and against a shoulder upon the base-bar 2 to give motion to such base-bar and lens-tube in one direction, and a screw is employed to move the parts in the other direction; but if this screw were applied in a position parallel with i 3 to the base-bar by dovetailed lugs 7, upon the axis of the lens-tube it would be difficult to grasp and move it. To facilitate the adj ustment,the screw 9 is applied at right angles to the lenstube, and supported by a holder, 10, on the basebar 2, and a right-angle lever, 11, is pivoted at 12 upon the base-bar, and there is a swinging strut, 13, fastened at one end by a screw to the rack-bar 3, and the other end rests against the short arm of the lever 11, and the spring 8 tends to keep the strut 13 against this lever 11; hence when the screw 9 is moved it acts upon the lever 11, and moves the base-bar and lens-tube in one direction, the strut 13 becoming a resistance against which such lever 11 acts, and if the screw 9 is unscrewed the lever 11 swings as the spring 9 moves the lens-tube and base-bar 2 in the opposite direction.

The base-bar 2 is notched for the insertion or withdrawal of the dovetailed lugs 7, so that the parts can be put together or separated. This is done when the strut 13 is swung aside to allow the necessary end movement to be given to the lens-tube and base-bar for the openings in the basebar to coincide with the dovetailed lugs 7.

By the" aforesaid construction the wheel at the end of the screw 9 is at the right side of the lens-tube, and can be easily operated without the finger coming into contact with any part of the lens-tube, and this screw only gives a very gradual and accurate adjustment to the lens-holder to obtain the proper focus on the object.

The arm 5 is either made in two parts or slotted longitudinally, so that the jaws 4 may be tightened upon the rack-bar 3 by the screws 14, to prevent looseness at this part, and upon the lower end of the arm 5 are the circular.

thumb- I can be inclined more or less, the

joints

15, 16,

and 17 being clamped so as to move together between the

cheeks

20 and 21; or when the said joint is loosened the parts can be swung upon the joint-pin to bring the lens-tube ver-' tical and adjacent to the leg 23, and the object'table 19 horizontal and above the

legs

24 and 25, the arm 18 being close to the baseframe 22, so that the parts are compact and occupy but little space when introduced into a case for preservation or transportation.

The pivot-bolt 26 passes through the cheeks 2O 21 and through the joint-

pieces

15, 16, and 17. It has a flange, 27, to rest against the outside of the cheek 21, and a screw at the other end for the reception of the thumb-nut 25, by the turning of which nut 25 the whole of the parts of the joint can be clamped between the cheeks 20 21, to hold the

arms

5 and 18 and the parts carried by them in any position or inclination in which they may be placed, and I apply to this bolt 26 a stud, 29, that enters a notch in the eye of the joint-piece 15, so that the bolt 26 always turns with the joint-

pieces

15 and 16 and arm 5. (There is a notch in the eye of the check 21 to allow this stud 29 to pass through when the parts are put together.) In this pivot-bolt 26 there is a clamp-block, 30,

, passing in laterally, and being within the jointpiece 17, and the inner end of this clampblock is beveled, and there is an axial hole in the pivot-bolt 26 for the reception of the conicalpointed screw 31, having a thumb-wheel at its outer end. It is now to be understood that it is only necessary to screw in the screw 31 to firmly hold the joint-

pieces

15, 16, and 17 together, and cause them to turn as one within the cheek-pieces 20 21, because the pivot-bolt 26 is connected to the joint-

pieces

15 and 16 by the stud 29, and the clamping-block 30, being forced outwardly by the conical end of the screw 31, applies a clamping friction to the joint-piece 17, causing it to move also with the pivot-bolt 26; hence when the instrument is opened out for use and the lens-tube placed perpendicular to the obj cot-table, the stops upon the joint-

pieces

16 and 17 and

arms

5 and 18 coming together like a rule-joint, all that is now necessary to retain the instrument in position foruse is to screw in the screw 31 and clamp the parts of the joint together, and the lens-tube and object-table as a whole can now be inclined more or less by swinging it and turning the pivot-bolt within the cheekpieces of the base-frame, and the thumb-nut 25 is availed of for holding the instrument at the desired inclination.

At the junction of the object-table 19 with the arm 18 is a circular holder, 32, with a beveled edge, and upon this rests the eye of the arm 33, that holds the mirror, and there are beveled claws 34 and a bevel-ended clamp, 35, held to the arm 33 by a screw, so that this arm 33 can be revolved around the holder 32, and placed in any desired position relatively to the object-table, and this arm 33 is slotted for the passage of the pivot 36 of the mirrorholder 37, and there is a slide-block, 38, above the arm 33, and a clamp-block, 39, below such arm 33, the pivot 36 passing through said blocks and being made in the form of a screw. The slide-block 38, clamp-block 39, and mirror-holder 37 are clamped in place by means of the pivot-screw 36, afterv being adjusted. By this construction of mirror-holder the light can. be directed upon the object under examination from any direction by turning the arm 33 around upon the circular holder 32, and by sliding the mirror-holder and its clampingblocks in or out, andby revolving the mirrorholder upon its pivot.

There may be a movable septum, 40, applied beneath the object-table, with holes of difi'erent sizes to admit more or less light to the object, as usual in microscopes.

I do not claim an adjustingscrew acting to move the lens-tube, the rack-bar, the pinion, and the base carrying the pinion. By my improvement the pinion and its base are not moved by the adjusting-screw; but such screw acts between thelens-tube and the rack-bar to move only the lens tube and the parts thereon.

I claim as my invention- 1. The combination, with the base-tube and base-bar 2, of a rack-bar, 3, an adjustingscrew for regulating the position of the basebar upon the rack-bar, and the jaws 4, thumbwheel 6, and pinion for adjusting the rackbar within the jaws, substantially as set forth.

2. The combination, with the lens and basebar 2, of the rack-bar 3, the spring 8, screw 9, right-angle lever 11, and swinging strut 13, for adjusting the lens -tube endwise of the rack-bar, substantially as set forth.

' 3. The combination, with the lens-tube and its base-bar, of the rack-bar 3, having dovetailed lugs 7, passing into undercut grooves in the base-bar 2, the spring 8, to give motion to the parts in one direction, the right-angle lever 11 and the screw 9, acting against the same, and the swinging strut 13 between the right-angle lever and the rack-bar, substantially as set forth.

4. The combination, with the lens-holder and object-table, of the

arms

5 and 18, the joint-pieces upon the respective arms, a baseframe with cheeks for the reception of the joint-pieces, a pivot-bolt passing through the joint-pieces and cheeks, a clamping-nut for holding the parts, and a clamping-block and screw for stifiening the joint between the

arms

5 and 18, substantially as set forth.

5. The joint-pieces15 1617 and the cheeks 20 21, in combination with the flanged pivot-bolt 26, thumb-nut 2 5, stud 29, clamping-block 30, and screw 3l,for actuating the clampingblock, substantially as set forth. 6. The combination, with the object-table 5 and the arm for holding the same, of the circular holder 32, arm 33, claws 34 35, and mirror-holder supported by the arm,substantially as set forth.

7. The mirror-holder 37 and. its pivot-screw 36, in combination with the slotted. arm 33, slide-block 38, and clamp-block 39, substantially as set forth.

8. The combination, with the object-table and the arm supporting the same, of a mirror- [5 holder, an arm for carrying the same, having a circular eye surrounding the arm that supports the obj cot-table, and a. circular holder for the said eye and its arm, and claws for grasping the edge of the holder, substantially as set forth, whereby the mirror-holder and 20 its arm can be adjusted into any desired position relatively to the object-table, substantially as set forth.

Signed by me this 13th day of February, A. D. 1886.

BENJAMIN F. ALLEN.